What’s the best screening solution for you? With many options available, companies often struggle to find the optimal machine for their specific requirements. Although all technologies serve the same basic purpose – the separation of particles by size – they fundamentally differ in their construction, operation, and applications. The right choice can not only increase productivity but also minimize maintenance and downtime, which is crucial in today’s competitive industrial landscape. Below, we’ll look at the differences between conventional vibratory screens and direct-excitation screen machines to help you make your decision. Conventional Vibratory Screens: How They Work Conventional vibratory screens operate with an oscillating motion transmitted to the entire screen frame. This movement is generated by eccentric shafts or unbalance motors, ensuring the material advances on the screen surface and particles can fall through the mesh. Advantages of Conventional Screens: * Simple design * High throughputs * Flexibility Disadvantages of Conventional Screens: * Inefficient separation with low vibration…

With coal plants being phased out the construction industry faces a gypsum supply challenge. Recycling becomes a crucial alternative. The global shift away from coal-fired power plants has significantly impacted the availability of Flue Gas Desulfurization (FGD) gypsum, a byproduct of these plants. With coal plants being phased out, particularly in countries like Germany where a complete shutdown is expected by 2038, the construction industry faces a gypsum supply challenge. Currently, more than half of Germany’s gypsum demand, approximately four million tons annually, is met through FGD gypsum. As natural gypsum sources are limited, recycling becomes a crucial alternative, with an estimated three to four million tons of gypsum waste available for recovery. Globally, FGD gypsum production is projected to peak around 2030, declining thereafter, especially in Europe, Japan, and potentially the USA. This shift presents both challenges, such as rising gypsum costs due to reduced FGD output, and opportunities, including a growing recycled gypsum market projected to reach $3.21 billion by 2030. Recycling…

The RHEWUM ScreenSpector app optimizes screening machine monitoring with tools like MeshConverter and VibSonic, available for iOS and Android. The RHEWUM app, known as ”RHEWUM ScreenSpector,” provides users of RHEWUM screening machines with tools for optimal utilization. Available for iOS and Android, it supports the operation and monitoring of screening machines with several key features: MeshConverter The MeshConverter simplifies the conversion of mesh sizes. It converts between DIN millimeters, inches, ASTM, and Tyler mesh units and offers advanced functions for calculating separation sizes for inclined screens. Users can input mesh sizes and angles to determine separation sizes in inches or millimeters. The tool supports calculations with any two values, making it a comprehensive solution for various screening scenarios. Additionally, the inclination angle (0°-45°) can be automatically determined using the smartphone’s sensors. VibSonic VibSonic transforms your smartphone into a powerful sound measurement device that measures sound levels across various frequencies. It calculates a mean…

Learn how a French urea prills manufacturer aims to address production challenges with a tailored screening approach. The Challenge: Ensuring Consistent Product Quality A prominent French manufacturer of urea prills faced a critical juncture in their production process. Their existing screening system, handling both uncoated and coated prills, struggled with persistent clogging in the lower deck and excessive dust in the final product. The manufacturer required exact separations for two fine screen cuts during loading screening, adhering to strict quality standards that permitted only a small percentage of undersized and oversized products. Developing a Quality-Focused Configuration RHEWUM’s engineering team conducted a series of in-depth screening tests to determine the optimal machine configuration. These tests focused on various screen designs, amplitudes, and frequencies to enhance separation efficiency and product quality. The aim was to develop a solution specifically tailored to overcome the quality challenges faced by the manufacturer. A Tailored Solution: Precision…

Screening plays a crucial role in optimizing its functionality by controlling particle size to match the needs of specific applications. Bentonite, a versatile clay mineral valued for its absorbent and swelling properties, is essential across diverse industries. From drilling fluids to cosmetics, bentonite’s unique characteristics make it invaluable, yet challenging to process efficiently. Here’s an overview of bentonite’s applications and the specialized screening techniques that address processing challenges. Key Applications of Bentonite - Drilling Fluids: Bentonite is used in drilling for oil, gas, and water due to its ability to stabilize borehole walls, cool drill bits, and suspend cuttings. Fine particles (75-150 microns/ 100-200 mesh) are crucial here, as they prevent clogging and create a stable slurry. - Foundry Sand Binder: In casting molds, coarser bentonite particles (150-250 microns/ 60-100 mesh) ensure structural integrity and prevent excessive dust, helping molds retain their shape during metal casting. - Iron Ore Pelletization: Fine, uniform particles (45-150 microns/ 100-325…

The processing of silica and silica gel requires precise and specialized screening technology. These materials, whether as a desiccant, carrier material or additive, pose complex challenges due to their specific properties such as different particle sizes, hygroscopic nature, dust formation and abrasiveness. Especially when used in food supplements, purity and gentle product processing are crucial. Screening ensures compliance with strict quality standards by classifying the materials into particle sizes and removing unwanted particles such as fine dust or oversized particles. This optimizes both further processing and the overall quality of the end product. Screening of silica powder and gel In the processing of silica and silica gel, screening machines are used in several production steps: - Dedusting: removal of fine dust (<0.1 mm/ 140 mesh) to minimize clumping and dust pollution. - Classification: separation into specific fractions, e.g. 0.1-0.5 mm (140 – 35 mesh) for powdery products or 1-6 mm (18-3 mesh) for granulates - Oversize separation:…

Precise screening machine enhances sorbitol production for a leading sugar substitute producer from Turkey Turkish starch industry leader chooses RHEWUM’s cutting-edge technology for sorbitol production A leading enterprise in the Turkish starch and starch derivatives industry, with a legacy dating back to the 1980s, continues to drive innovation. Known for its unwavering commitment to advancement and diversification, this sorbitol producer from Turkey has expanded its product portfolio to cater to various sectors, including food, textiles, paper, chemicals, pharmaceuticals, personal care, and specialized industrial applications. One of the standout products in their range is sorbitol, a low-calorie natural sweetener with a low glycemic index. In a strategic move to further enhance their sorbitol production capabilities, this Turkish enterprise recently chose RHEWUM’s cutting-edge RHEsono® screening machine, achieving an impressive throughput of 4 tons per hour with precise particle separation at less than 0.5 mm and 0.1 mm. The RHEsono® vibrating screening…

A pioneering company specializing in the development and manufacturing of equipment for the recycling industry has launched an innovative project in the Netherlands. The goal was to process burned soil as a valuable supplement for building materials. This challenging application, primarily involving dust and ash from burned solids like earth and sand, requires ultra-fine screening at 60 μm (230 Mesh) with highest purity demands. Soil is burned to eliminate harmful organic contaminants, pathogens, and invasive species, which otherwise render the soil unsuitable for construction purposes. By eliminating these impurities, the recycling industry transforms this cleaned soil into a valuable, sustainable raw material for building applications, contributing to a circular economy and meeting high environmental and safety standards. To realize this transformation, the facility was designed to achieve high-precision separation with a throughput of 20 t/h. The fine grain size, along with the abrasive and corrosive nature of the material, and temperatures reaching up to 200°C, required advanced solutions. RHEWUM’s extensive screening trials proved successful, delivering machinery that achieves product purity of nearly…

Screening the finest silicon powder requires the highest purity standards. Not challenging enough? Then make it gas-tight for hydrogen This is how it works: he highest purity standards are required for the sieving of high-purity silicon powder, which is used in chip and solar panel production. Even the smallest impurities can have serious consequences for the quality of the end product. RHEWUM has risen to this challenge and supplied three RHEsono® screening machines that have been specially developed for screening the finest silicium powder. The focus here was on a special technical requirement: hydrogen tightness. One of the biggest technical challenges was that the screening machines had to be gas-tight, in particular hydrogen-tight (H2-tight). In a hydrogen atmosphere, the hydrogen protects the sensitive silicon powder from unwanted chemical reactions that could be triggered by metal ions (hydrogen passivation). This protective effect is crucial to ensure the high purity of the end product. However, the extremely small hydrogen molecules can pass through steel and cause hydrogen embrittlement, which makes the…

How do you achieve maximum product purity and high throughput rates when screening hygroscopic diammonium hydrogen phosphate (DAP)? Diammonium hydrogen phosphate (DAP) is an essential component of many fertilizer compositions due to its high phosphorus and nitrogen content. When screening DAP, producers are faced with the challenge of ensuring fine and homogeneous particle sizes, while at the same time guaranteeing a high production rate and product purity. Challenges in the sieving of DAP Screening DAP is technically challenging as the material is hygroscopic, i.e. it absorbs moisture from the ambient air and has a tendency to form agglomerates. These agglomerations make it difficult for the material to pass through the screen meshes and impair the efficiency of the screening process. In addition, high throughput rates can lead to blinding and clogging of the screen mesh, which can result in the screening process having to be completely interrupted, bringing the entire production process to a standstill. Precise screening using innovative technology RHEWUM specializes in screening challenging…

A facility in Louisiana, USA, has enhanced its barite processing for fracking by acquiring two RHEsonox screening machines and a RHEmid feeder, aimed at improving the efficiency and precision of barite screening. Barite, a mineral composed of barium sulfate (BaSO4), is commonly used in the oil and gas industry, especially in hydraulic fracturing (fracking) and drilling operations. In these contexts, barite serves as a weighting agent in drilling muds. The high density of barite helps to counteract the immense pressures found in oil and gas reservoirs. By adding barite powder to the drilling mud, the overall density of the mud is increased, which in turn helps to maintain the stability of the borehole, control formation pressures, prevent blowouts, and facilitate the extraction of oil and gas. In order to upgrade barite processing for fracking RHEWUM America Inc. recently delivered two RHEsonox® sieving machines that precisely screen barite with separations cuts of up to 325 mesh (50 μm) and a RHEmid feeder for uniform material distribution. The RHEsonox® high-performance screening machine utilizes two counter-rotating imbalance motors to create linear motion, facilitating…

Our corporate website rhewum.com is now available in 104 different languages to offer you the best possible user experience. What does this mean for you? Thanks to this new feature, you can easily access all RHEWUM information, services and products in your preferred language, whether you are from Europe, Asia, America or Africa. Our website is now globally accessible and adapts to your language needs. Your advantages at a glance: - Global accessibility: get all the information you need in the language of your choice, without language barriers. - Improved user experience: Navigate effortlessly through our website and find what you are looking for faster. - Clarity and comprehensibility: Understand our products and services better thanks to accurate translations. Efficient communication: Contact us in your language and get immediate, understandable answers. We use AI-based translators to ensure that the content on our website is delivered with high quality and comprehensibility. Our goal is to provide you with the best possible user experience and make your interactions with us…

Announcing the launch of our latest innovation, the RHElite high-precision screen, a groundbreaking solution designed for the most demanding industrial applications. Engineered with a perfect blend of steel and Carbon Fiber Reinforced Polymer (CFRP), the RHElite sets new standards in the screening of finest high-end products. How is it possible to build such a machine? Due to the anisotropic behavior of certain types of GFK (glass-fiber-reinforced plastic), where mechanical properties such as strength and stiffness vary depending on the direction, the machine can be specifically optimized for certain load directions. This allows for more efficient and targeted use of materials. Optimized for Unmatched Precision Screening The RHElite is engineered to perform with unparalleled precision, making it the top choice for the screening of the finest high-end products. Its advanced technology ensures sharper separation of fine particles, significantly enhancing the quality of your output. The sophisticated design and superior performance of the RHElite outpace traditional models, offering a more energy-efficient solution that meets…

Discover how advanced sieving technologies optimize the processing of Boron Nitride. This technology allows for precise separation of the material into highly pure fractions The Role of Boron Nitride and the Importance of Sieving Technology Boron Nitride, also known as Bornitrid, is a critical raw material in various industrial sectors, due to its unique properties such as high thermal conductivity, chemical resistance, and excellent insulating qualities. To ensure the quality and purity of Boron Nitride, sieving technology plays a central role. The requirements for the sieving processes are demanding. The particle size of Boron Nitride varies greatly, and the separation into highly pure fractions is critical for application consistency. Here, the innovative sieving machines from RHEWUM come into play, which are specially tailored for the challenges of sieving Bornitrid. Applications of Boron Nitride Sieving Machines Bornitrid is used in a variety of applications, from lubricants and ceramic components to thermal conductive pastes. For all these applications, the purity of the material is crucial. The Boron Nitride Sieving Machines…

Learn how RHEWUM’s screening technology optimizes the separation of glass fiber reinforced polyamide beads to increase quality and efficiency in material processing. Introduction The industry is continuously faced with the challenge of processing materials not only efficiently and economically, but also meeting the quality requirements of end products. A special focus is on the processing and separation of plastics, especially glass fiber-reinforced polyamide spheres (PA GF). These specialty plastics, enriched with glass fiber, offer improved mechanical properties and are therefore in high demand in many technical applications. Efficient sieving of these materials is crucial for the purity of the end product and thus for the quality. In this context, RHEWUM sieving machines play a central role. Technological progress in sieving technology RHEWUM’s sieving technology is based on long experience and continuous development to meet the specific requirements of different materials. Particularly in the separation of glass fiber-reinforced polyamide spheres, it is essential to achieve precise separation to secure the desired material…

As the world gravitates towards sustainable solutions, the recycling of lithium-ion batteries has emerged as a crucial element in our green future. Central to this process is the handling of ’black mass,’ a complex substance that presents unique challenges in recycling and especially screening. Understanding Black Mass Screening Black mass, primarily composed of valuable metals like lithium, cobalt, and nickel, also contains graphite, which complicates the recycling process. Screening is essential at different stages, such as removing larger metal foils during black mass creation and purifying black mass by removing materials like aluminum and copper. The primary challenge arises from the large fraction of fine graphite particles in black mass, which can be as small as 10 µm. The nature of fine graphite as a sticky, greasy material complicates the process. It tends to adhere to other particles, making separation difficult. Additionally, graphite’s propensity to clog meshes and form agglomerates that move as cakes across screens reduces screening efficiency. Traditional screening methods often struggle…

Four profitable RHEsono® vibrating screening machines equipped with pneumatic vacuum cleaning technology have been delivered to Shanghai, China. These machines are set to advance the sieving process for sorbitol, a widely used sugar substitute and food additive (E 420) in various industrially manufactured food products. Each of the four RHEsono® sieving machines is equipped with three sieve decks and a remarkable processing capacity of 10 tons per hour. The sieving application involves sorbitol with three distinct particle size fractions: 1.25 mm, 0.5 mm, and 0.28 mm. Sorbitol, also known as food additive E 420, glucitol or hexanhexol, belongs to the group of sugar alcohols, making it a crucial ingredient in the food industry as a sugar substitute, carrier substance, and moisture retention agent. The Challenge of Sieving Sorbitol Sorbitol processing can be a challenging task due to its sticky nature even when it has low moisture levels. This characteristic can lead to sieving complications, including mesh clogging, which can negatively impact product quality. To address this issue, RHEWUM’s RHEsono®…

Foundries face the challenge of efficiently separating casting molds and sand cores from cast metal parts. This sand must be recycled. What is Cast Shakeout and Sand Shakeout? After the molten metal is poured into the molds and solidified, these molds need to be removed to obtain the finished castings. This process is called shakeout. Cast Shakeout specifically refers to the separation of casting molds or cores from the cast metal parts. Cores made of materials such as ceramics, which have a different composition than the surrounding sand, are often used. To obtain the final shape of the casting, these cores need to be removed. On the other hand, Sand Shakeout involves the separation of sand molds and sand cores from the cast metal parts. Sand is commonly used as a molding material in the foundry industry. Once the metal is cast and solidified, the sand molds need to be removed to expose the castings. RHEtrans for efficient Cast Shakeout RHEtrans by RHEWUM is an oscillating chute with an unbalanced drive, known for its economical conveying capability and robust, reliable construction. RHEtrans…

Screening machines optimize the quality of lignin by removing impurities and dust, classifying lignin pellets by size and eliminating lumps. Lignin is the second most common biopolymer on earth after cellulose. In the industrial processing of wood, especially in paper production, lignin is produced in large quantities as a by-product. In the past, this by-product was often burned to generate energy, but due to its chemical structure and properties, it is now used as a filler, additive, binder, reinforcing agent or adsorbent. The use of lignin in these and other applications is in line with the trend towards the bioeconomy, in which renewable, plant-based raw materials are used instead of fossil resources. Improved lignin quality Screening machines help improve the quality of the produced lignin and prepare it for specific applications or further processing steps: - Cleaning and separation: Lignin obtained from the pulping process of lignocellulosic materials may contain impurities or undesirable solid components. Screening machines can help to remove these impurities. - Classifying: Lignin particles…

Insect larvae separations require high-precision, smooth screening processes that are suitable for keeping living particles alive in the technical process. RHEWUM uses machines of the RHEflex type, among others, for this purpose. The RHEflex linear vibrating screen is used for protective screening and classification of medium- and coarse-grained bulk materials. For these machines, a special process has been developed for a simplified change of PU-panels. In this process, one screening surface consists of three cassettes each, in which PU-panels are fixed. This gives maintenance teams quick and easy access to the screen elements. Screening elements: Special screen linings made of polyurethane For separation, polymesh PU screen panels made of polyurethane are used instead of screen cloths. The abrasion-resistant and cost-efficient polymesh screen panels combine durability with maximum precision. They are ideal for screening fine, abrasive or moist materials. In this way, smooth separation of larvae from the culture medium can be carried out.

Due to the flourishing construction industry, sand is now the second most traded raw material after water. But suitable sand resources are limited. RHEWUM has developed a solution to produce sand from widely spread gravel right next to the customer. A flourishing construction industry without sand is unthinkable. According to One Stone Consulting, around 10 to 15 billion tons of building sands are required worldwide each year (1). In addition, we need industrial sands, for example for fracking or the glass industry. This corresponds to a per capita sand consumption of about two to eight tons per year, so that a total of 40 to 50 billion tons of sand and gravel must be extracted. This makes sand the second most traded raw material after water (2). Since the demand for sand is growing faster than suitable sand resources can be found, sand is instead produced from gravel or transported over long distances. This is not environmentally reasonable. RHEWUM has developed a solution to process sand mobile and therefore directly on site. THE RAW MATERIAL Quartzite sand is mainly used in the construction industry. It consists of silicon dioxide (SiO2). The great hardness of the material (7° according to Mohs) is an advantage.…

Calcium carbonate is a material that originated from the remains of single-celled sea creatures over millions of years of Earth’s history. Today, it is the basis for a range of commonly used building materials, including limestone and dolomite. Finest separations up to 0.1 mm A British customer discussed with RHEWUM ways to renew an aging installation for processing calcium carbonate. Several existing sieving machines and sifters were to be replaced. Fine separations up to 0.1 mm were performed. Setting vibration during operation Machines with direct excitation of the screen fabrics were planned as the machine type. Drives for the decks on which coarser separations were to be performed were unbalanced motors. The decks for fine separations were equipped with oscillating heads that allow the vibration to be changed during operation via thyristor controllers. The machine types of choice were then RHEsono, RHEmoto and RHEfino as a combination of both types. For the task of feeding the material onto the machines, RHEside feeders with lateral feeding were used. Customer requirements were met With…

Sodium carbonate is difficult to screen as its hydrophilic properties cause agglomerations. RHEWUM’s high quality sieving technology increases production. Soda ash is obtained from sustainable production sources, such as the processing of wood. Soda ash is an indispensable raw material in partticular for the glass industry, but also used as a bleaching agent in the chemical industry and not least in the lye of Bavarian pretzels. The demand for high-quality soda ash is high. The quality of the soda granulate is significantly influenced by the performance, and thus the quality, of the screening machine in use. Soda ash is considered to be a difficult material to sieve, which easily sticks to the screening mesh and tends to form lumps due to its hydrophilic properties. The screening mesh can quickly become clogged and the entire production come to a standstill. Thus, the reliable supply of soda ash for important industrial sectors, and with it the capacity of soda ash producing plants, depends on the screening machine. With the RHEWUM WA, RHEWUM offers a state-of-the-art screening machine with direct excitation of the…

In cooperation with biologists, RHEWUM has developed a new screening machine for sorting mealworms. Screening mealworms poses unique technical challenges with regard to animal health and safety. New gentle sieving method developed for use in large mealworm farms In cooperation with biologists, RHEWUM has developed a new screening machine for sorting mealworms. Mealworms are gaining importance in the food industry as a sustainable source of high quality protein, and screening them in an animal friendly way poses unique technical challenges. Mealworms have long been regarded as unwanted additions by the food industry, but they have enormous potential for making our future more sustainable. Mealworms may not look like much, but they contain top quality protein and unlike other animals raised for meat, their impact on the environment is much less and they have few requirements for a healthy existence in accord with their needs. Increasing demand for sustainable, climate friendly alternatives to conventional animal protein means an increase in the demand for mealworms. Mealworms are raised from egg to usable larva in large mealworm farms. In order separate…

In future, RHEWUM will use environmentally friendly water-based paints when painting its machines. This not only benefits our environmental balance (VOC balance), which can be reduced to up to 78%. In this way it is now possible, among other things, to significantly reduce the use of diluents. A high quality and resilient corrosion protection is of course guaranteed. And that even with lower layer thicknesses. In addition, the drying temperatures can be halved from the current 80 ° C to approx. 60 ° C and drying times from four to two hours. Would you like to find out more about RHEWUM and its products? Contact us, we look forward to your questions.

From now on, customers can follow the screening test of their product live or book a virtual tour of the RHEWUM GmbH production facilities. If you wish, we would be happy to combine the two for you. Considering the current pandemic situation, some time may pass before customer visits to our company are part of our daily business again. But we don’t want to keep you, our customers, waiting. That’s why we are offering you the opportunity to follow your screening test live in our technical center via smartphone, tablet or computer. Join us virtually when your product is tested and discuss the results directly with our screening experts. You can find out more about the process of a screening test on our homepage. Or experience RHEWUM GmbH live on a tour through the production facility and the technical center where you will get an exciting insight into our German quality production. Of course, you can also combine the tour with your screening test. Make an appointment with our screening experts today for your personal, virtual meeting at RHEWUM.

In an official announcement, the Australian graphite producer BassMetals Ltd. recently announced the latest developments of the company to its shareholders. Among them were the convincing results from the RHEWUM technical center. Currently, BassMetals Ltd. uses three screening machines for producing five different (graphite) products. This procedure is very time-consuming and is to be simplified in the future by producing all separating cuts on only one machine. The company commissioned RHEWUM GmbH to deal with this problem and to find a solution. Whether as a pencil lead, solid lubricant, material for self-lubricating bearings and seals, or even as the shaft of a golf racket - graphite has many uses. In nature, the mineral occurs in the form of isolated flakes and grains in carbon-rich metamorphic rock and as veins in pegmatite. The company BassMetals Ltd. owns the Graphmada Large Flake Graphite Mining Complex in eastern Madagascar, in the immediate vicinity of the country’s only export port in Toamasina. From there, the mined and processed graphite is shipped primarily to the USA, Europe and India. The mining area has a unique graphite deposit in soft rock (regolith), which is characterized…

In the production of sodium carbonate with fluctuating feed rates and finest separations in the range of 200 µm, many manufacturers rely on the proven screening quality of the RHEWUM WA vibration screening machine to achieve optimum quality of their produ Sodium carbonate has been used by humans for a long time and is considered one of the most versatile chemical products. Its applications include the glass industry, the chemical industry, the pulp and paper industry as well as the detergent and soap industry. The screening task usually consists of screening out the existing dust content from the actual soda product. Recent screening tests with sodium carbonate at the RHEWUM technical center confirm that the type WA screening machine is perfectly suited for finest separations at high capacities. The screen cloth is excited to high-frequency vibrations by means of beater bars directly applied to the screen cloth. Outside of the screen housing rugged electromagnetic drives rock the knocker shafts, conveying the high frequency oscillation directly into the screen mesh. Accelerations of up to 15 g and more are thus achieved on the screen cloth. The power of the electromagnets can be adjusted during operation via an electronic…

Not identifying and correcting malfunctions on screening machines can become very expensive for you as a producer. But what to do if the service technician cannot be on site? The new RHEWUM Remote Service provides a solution. For us, SERVICE means supporting you at any time with our know-how, developing solutions quickly and implementing them effectively. That’s why we are now offering an exclusive RHEWUM Remote Service, which allows our service technicians to visit you virtually at your production site. What services are available for booking? In the "Service" menu select "Remote Service" to choose between a "Free Machine Inspection" or the "Remote Service Support". In the case of the "Free Machine Inspection", our service technician will spend one hour with you to inspect your machine and examine the function of your screening machine. Additionally, a written report with our recommendations for service and spare parts can be booked as an option. The "Remote Service Support ", on the other hand, is a chargeable offer that can be booked for four hours or more. This option is particularly suitable for maintenance work, emergencies or commissioning. How to make an appointment? Once…

In his production chain an American manufacturer will no longer use two machines for screening his plastic granulate, but only one: the Rhewum WAFL with two screen decks. Pavement markings have been used since the beginning of the 20th century. Today they are part of the modern street scene and without them we would sometimes lose orientation. The line markings create a clear and safe traffic guidance. The products of the world’s leading North Carolina-based manufacturer are not only used on roads and highways, but also on taxiways, take-off and landing runways, parking lots, intersections and in all types of commercial, construction, government, industrial and architectural environments. So these markings help drivers, pilots and pedestrians to move safely in the right direction. The exact process of producing road markings will not be discussed in detail at this point, as it is quite complex. However, plastic granulate is processed in the production of road markings, that must be dewatered. With the help of the Rhewum WAFL the water can be perfectly separated from the product and a low residual moisture of approx. 8 percent can…

In order to increase the plant capacity for the production of cat litter, an international oriented company for raw materials built a second production line, in which RHEWUM screening technology was used once again to ensure product quality. A new, modern and automated high-bay warehouse ensures better logistics and efficient transport organisation to Europe as well as to the United Arab Emirates and Australia. After the discontinuation of mining in 1992 the potash factory in Lower Saxony was converted for a cat litter production using the already existing infrastructure. As a result of the success and increasing demand in the sales network with other companies, the second production line will increase capacity by 40 percent per year in the future. For this purpose further proven screening machines of Rhewum gmbH were designed, ordered, delivered on schedule and installed into an existing building. The commissioning at the end of 2019 was successful without any problems…

At the beginning of September two employees of Rhewum gmbH headed east to introduce RHEWUM screening machines to potential customers and those interested. The trip took them from RHEWUM’s headquarter in Remscheid to Freiberg in the Free State of Saxony which is located 545 kilometers away. The first destination was the Technical University “Bergakademie Freiberg”. During their visit our employees met with heads of institutes and PhD students for networking and a live presentation on our demo screening machine. Afterwards, plans for future cooperation were discussed during a shared barbecue. Consequently, RHEWUM will stay in contact with the TU Bergakademie Freiberg in order to realize future joint projects and to benefit from an intensive bilateral knowledge transfer of theory and industrial practice in the field of mechanical process engineering. The journey continued from Freiberg to Lutherstadt Wittenberg. Apart from being famous for its probably most prominent…

Direct excited screening machines from RHEWUM for sugar industry A well-known European sugar producer was looking for new screening machines to replace his worn-out sizers. Since not only the old machines but also the building were affected, the new sifters should transfer as few vibrations as possible into the building and at the same time increase the efficiency of the screening process. So the decision was made for a machine with directly excited screen meshes. The existing sizers were designed for a throughput of 30 tons of refined sugar per hour with 5 separating cuts, whereas the required product quality for the lowest deck with a separating cut of 0.2 mm could not achieve the required product quality. To find a suitable replacement, trials were made in the technical center of RHEWUM, during which process-relevant parameters of the screening machine were determined and also the compliance with the permissible amount of off-spec particles for numerous sugar types was considered and proved. The results of machine types WA and…

Effortless screening of lumps with the Rhewum sv-S feeder What to do if the product has lumps so large that they could even damage the screen mesh? Then a pre-screening must be implemented.. With the help of a Rhewum SV-S feeder this is no problem. For the screening of 200 tons of calcium ammonium nitrate (CAN) per hour an internationally operating plant manufacturer will receive a RHEWUM screener type WAU including a SV-S for his end customer from Egypt. SV means "lateral distribution", S stands for "screen". The directly excited screening machine type WAU is designed as a double-decker with separations at 5 mm and 2 mm. To prevent larger lumps from damaging the screen cloth of the WAU or clogging the coarse grain outlet, they are screened in a pre-separation in the SV-S at 15 mm. This reduces the loads on the screening machine while maximizing the service life and optimizing the actual screening process. A further advantage of the SV feeder with screening is the uniform distribution over the entire width of the screen.…

To reduce the noise emission of your screening machine RHEWUM now offers an innovative sound insulation cover. Usually screening machines are not the quietest machines in the production chain. Due to impact bar movements the screen cloth is excited to high frequency vibrations. This, in combination with the product to be screened, causes noise emissions which sometimes have to be reduced. The sound insulation tarpaulin for screening machines provides a quick and uncomplicated solution to this problem. The sturdy, custom-made tarpaulin is covered with an acoustic membrane which damps the sound and absorbs sound energy. The sound power level of the machine can be reduced by 8 dB by attaching the sound-insulating tarpaulin, which corresponds to approximately halving the perceived noise level. The tarpaulin is flexible and easy to bend - which in turn ensures simple and quick installation on the machine. Important maintenance openings remain easy to operate, as the tarpaulin can be opened at the crucial points using robust zips. The short implementation time and the cost-effective…

Screen your ammonium nitrate safely and without risk by using RHEWUM screening technology. Ammonium nitrate is considered to be oxidizing but cannot ignite itself - unless large quantities are close together. Then it starts to work and heats up. The ammonium nitrate catches fire. This releases oxygen and the fire spreads. In fertilizers, it may only be used in mixtures due to its latent danger. But what does this mean for screening? Possible risks that could arise during a screening process of ammonium nitrate are, for example, high dust generation, which can lead to dust explosions and damage to health. In conformity with the ATEX directives RHEWUM screening machines are equipped with a dust-tight housing with connection to a dust extraction system to avoid high dust concentrations. A further risk is the required vibration during screening. All moving parts of a screening machine (e.g. the excitation axles, springs or bouncing balls for cleaning the meshes) which come into contact with ammonium nitrate can potentially cause an effective force. This friction…

French animal feed manufacturer gets suitable RHEWUM screening machine for screening of meat and bone meal. Animal meal is often added to animal feed as a source of protein and used as food for pets as well as zoo animals. Under strict conditions, it is also suitable as a fertilizer in agriculture. For the feed capacity of 20 tons of animal feed per hour the customer now receives a screening machine type WA with suitable feeder type SV from RHEWUM which replaces an outdated screening machine of another screening machine manufacturer. The separation is at 1 mm for removing lumps and impurities. The type WA is excellently suited for sieving powder and meal in the finest to medium grain range and can be easily integrated into existing plants. The direct transmission of the vibrations to the screen mesh via powerful electromagnets is not only energy-efficient, but also enables extremely high accelerations of more than 15 g and thus guarantees a sharp separation even when screening fine powders. Further convincing advantages of the Rhewum wa are the high availability and reliability.…

Rudolf Landsmann is the new Senior Manager Modernization and Retrofit. RHEWUM screening machines usually have a long lifetime. But often the demands on the machine change during its lifetime. Therefore the machine has to be modernized (retrofit). Due to their long experience our screening experts of the RHEWUM retrofit team are able to realize the complex customer requirements and to make the RHEWUM screening machine fit for new tasks. After studying processing technology at the renowned TU Clausthal in Lower Saxony, Rudolf Landsmann started at Rhewum gmbH in 1987 as laboratory assistant and deputy laboratory manager of the Rhewum technical Center. There he accompanied the research and development of special machines which were then as now designed and manufactured specifically according to customer requirements. Rudolf Landsmann was also significantly involved in the further development of today`s multi-deck plansifter MDS and wet screening machine WAFL. In 1989 the graduate engineer changed to the sales department of Rhewum gmbH and…

The leading Italian producer of building products expects two new vibratory screening machines. In the Fassa bortolo plants sixteen Rhewum wa screening machines, one Rhewum dfm and one Rhewum mds machine have been performing faithfully in the classification of dolomite, limestone and sand since 1991. For its plant in Brazil, the industry specialist requires screening machines that will be used in the future for classifying limestone and silica sand. The limestone to be classified has a nominal feed capacity of 60 t/h and a maximum of 70 t/h per screening unit, whereas with silica sand it is a nominal 30 t/h and a maximum of 60 t/h. The separation is 4.5 mm, 3.0 mm, 1.2 mm and 0.6 mm with a desired screening of maximum 140 tons per hour. Due to the requirements two screening machines of RHEWUM type WA with triple-deck screening unit and the 60 Hz mains frequency required for Brazil proved to be the optimal solution. Not only the very good quality of our screening machines is decisive for the customer. But also our many years of experience in the uncomplicated…

RHEWUM supplied various asphalt mixing plant operators with new DF screening units for the season. In general asphalt is a mixture of minerals and bitumen as binder. In asphalt mixing plants asphalt mixes are produced by a thermal mixing process of mineral rocks, filler (rock flour), binder (bitumen) and if necessary additives for different requirements. Screening machines are required to classify the mineral rock for these processes. Like for example the Rhewum double Frequency Screening Machine (short DF) - a high performance unit for screening in the medium and coarse grain range. The drive principle of the DF is based on the use of two vibration motors with different speeds. The product is loosened and mixed at the screen inlet due to the large vibration amplitude. The higher frequency at the screen outlet causes even difficult to screen material to be screened due to the higher acceleration. By changing the direction of rotation of the vibration motors at the inlet and outlet, the transport speed of the product can be changed. Advantages include good accessibility…

RHEWUM Screening Technologies for Glass Processing Glass can be found in almost all areas of daily life. Starting in the construction industry, through telecommunications, household, food, automotive and aircraft construction to optics. The ever-increasing demands on technical glass can only be met by using ever more precise basic materials such as quartz sand and soda. But also a variety of glass products such as glass wool, glass balls or other waste glass only become a saleable product through classification. RHEWUM screening machines are also used in the processing of glass. Glass production The technique of glass production has been known for over 6,000 years. It has been continuously refined until today. Since then, glass has been used in a wide range of applications and has become a versatile material. In general, every glass contains one or more glass-forming oxides. The most commonly used are silicon dioxide (SiO2), i.e. quartz sand, but also boron trioxide and phosphorus pentoxide. Classification in basic…

RHEWUM will also build the vibration motors in-house in the future. The motors are compatible. We have made it our ambition to manufacture the best screening machines in the world. To achieve this, we also need the best vibration motors in the world. We have focused our in-depth expertise in screening and motor technology to make energy-efficient vibration motors even more reliable and stable, so that our customers can rely on a trouble-free production process. The result is our GeniusDrives. All key parts of the GeniusDrive are manufactured in Germany. Each of our self-produced unbalance motors is tested under full load before it leaves the production line. It is of utmost importance to us that the motors are perfectly matched to our machines and the needs of our demanding customers. Technical and other information can be found on the website of the same name. Order today and we promise you a fast delivery.

As an expert for screening machines RHEWUM has an answer First considerations in advance Before you contact potential suppliers, you should be clear about the general conditions for the new screening machine. Keep in mind that every increase in quality requirements leads to an increase in costs, as the required screen areas have to be increased. In production engineering, therefore, the basic principle is: as exact as necessary and as imprecise as possible. An often underestimated question is: Should the machine be planned into an existing building or is the building still to be erected? While directly driven screening machines hardly emit any vibrations and are therefore statically negligible, these must be taken into account with vibrating machines. The statics of the building must be adapted to the machine type and may become a cost driver. Experience has shown that vibrating screening machines at great building heights can cause lasting damage to weak structures. Furthermore, the height situation must often be taken into…

RHEWUM presents solution for difficult screening tasks in the fertilizer industry. Typical phosphate fertilizers have specifications that allow particle sizes between 2 mm and 4 or 5 mm. In addition, these products are often expected to have a quality of more than 90 percent, which means that only 10 percent of the particles may be outside the specialized range. On the other hand, phosphate fertiliser production plants have a production rate of several hundred tonnes per hour. Phosphate granulate tends to clog the screen meshes. If this occurs, production must be stopped to allow the meshes to be cleaned or replaced. The biggest challenge of a phosphate screening machine is therefore to obtain a high quality material with a high throughput while ensuring a low downtime for maintenance. Our solution - the WA(U) screening machine The concept of the Rhewum wa/WA(U) screening machine consists of directly excited screening meshes which are positioned at an angle to transport the material over the screen. The whole machine housing does not move while the…

The trade fair for granulate, powder and bulk solids technologies will take place at the Dortmund Exhibition Centre from June 24-25, 2020. SOLIDS is part of the international Solids european Series (SES), which also stops in Antwerp, Rotterdam, Zurich, Krakow and Russia. Parallel to the bulk solids fair the sixth edition of Recycling Technology opens its doors in April in the Dortmund exhibition halls. At this year`s SOLIDS 500 exhibitors will present their technologies and solutions for the processing, handling, storage, transport and analysis of powders, granules and bulk materials. As the leading business and innovation fair for bulk solids technologies, SOLIDS combines a first-class exhibition in four exhibition halls with an attractive supporting programme and numerous networking opportunities. The high-quality lecture program and guided tours additionally enhance this fair. You will find us in hall 6 at booth R04 with our mobile screening machine WA(U). There…

Rhewum screening machine as a solution for wood recycling The manufacturing process of laminate includes many steps. However, the largest amount of waste is produced when the wooden boards are cut into planks. Both waste and sawdust are produced, which can hardly be sold as an end product. This was exactly the problem in 2016 when one of the world`s leading manufacturers of wooden flooring and interior fittings relied on RHEWUM screening machines to recycle its waste in order to increase the overall production efficiency. The special challenge here was the separation of the fine sawdust which comes from a mill. In general wood-based materials tend to clog the screen fabric easily. This is because during the screening process the fine particles can get stuck in the meshes and reduce the screening performance. In this case, the customer`s grain spectrum was wide. From highly visible wood chips of more than 10.0 mm in size that have to be shredded again, to the screening of fine dust below 400 microns, which makes up almost a…

Renewable energies are today more important than ever. SUEZ focuses on sustainability and therefore produces high-quality biogas and compost! In Montpellier, SUEZ supports its subsidiary Amétyst with 10 million euros for the development of its processing plant for domestic waste and biowaste with the aim of increasing the process capacity as well as the product quality. After optimizations, including in the field of methanation, SUEZ concentrates on the issue of efficiency and compliance with regulatory standards for compost production. For this purpose Amétyst uses RHEWUM screening machines type WA with feeders type AV at the end of the separation process. After the organic waste has completed various procedural steps and has been treated for 2 to 3 days in a bioreactor, the fraction of 0- 20 mm is separated from it by using four screening machines with direct excitation of the screen cloth (see video from minute 1:10). These screening plants have been specially developed for the integration into the production…

GUPA - responsible for Italy and Switzerland As of July 2017 our customers in Italy and the Italian-speaking part of Switzerland are exclusively served by the company GUPA. The multilingual team represents leading foreign firms from the sector of polymer processing and the bulk solid industry. The company, which was founded in 1970, is specialized in distributing high-quality machinery and equipment that is in accordance with the latest technological standards and usually protected by patents. The large representative pool enables GUPA to offer its customers an excellent mixture of highly competitive technologies. RHEWUM has a very positive outlook for the joint cooperation and is looking forward to the competent consultation and service for its Italian and Swiss customers as well as those interested in its screening equipment. If you have any questions, do not hesitate to contact the GUPA Srl directly: Via R. Bertieri, 2 - 20146 Milano (MI), Italy Telefon: +39 02 48952242 E-Mail: customerservice@gupa.it

Specific knowledge from A to Z What is an eccentric? How works a Banana Screen? And what means warp? Get more information in our glossary about the topic sifting and screening now: http://bit.ly/2h99nOC

For the vertical transportation of different solids The RHEWUM vibrating spiral conveyor type SC is suitable for the transportation of bulk solids from different production processes. A product handling can be realized with the double bottom of the conveyor. It is possible to either heat, dry or cool the products during transportation. See more at: http://bit.ly/2lMn1cl

From 14th to 16th February 2017: exhibition for bulk material The EXPOSOLIDOS – El Salón de la Tecnología y el Procesamiento de Sólidos (salon for the technology and processing of solids) – is the most important fair on powder and bulk solids in Southern Europe and takes place every two years to inform about the sector of transport, measurement technology and handling of bulk solids. It takes place from 14th to 16th February in Barcelona (La Fraga de l’Hospitalet). The perfect meeting point for business and networking! In collaboration with our representative Envisolid S.L., one of our RHEWUM specialists advises you on-site regarding screening technology and classifying. We are looking forward to your visit at our association booth No.141E!

The technical RHEWUM app has been renamed to „RHEWUM ScreenSpector” and offers operators o Already since 2014, the RHEWUM app supports its users during maintenance of their screening machines- simple, fast and free of charge. The app consists of the four following functions: 1. VibFlash The smartphone’s flash light generates a stroboscopic light with a predetermined frequency and thereby visually records and investigates the vibrations of the respective plant. This feature is only available for iOS so far. 2. MeshConverter The MeshConverter allows to convert screening mesh widths from S.I. units into US measurement units. Furthermore, this feature can convert mesh sizes into screen cuts. 3. VibSonic This feature uses the integrated microphone and records noise emissions of individual machines or plants. Compliance with noise level limits as well as functional capability can easily and quickly be inspected. 4. SizeChecker By means of the integrated camera this function measures and calculates the grain size distribution of…

The RHEWUM app which is available since autumn 2014 has been extended by a further smart function - and this result is also impressive! With the help of the MeshConverter feature the app-users can quickly and easily convert screen mesh sizes from SI units into the Anglo-American unit system. The basis of this conversion is exclusively on the DIN-main and secondary lines, which are converted to ASTM International norm (original American Society for Testing and Materials) and also to Tyler standard. In addition the new app feature allows a smooth conversion of mesh sizes into separation cuts for inclined screens. This requires detailed knowledge of the screen inclination, which can be conveniently determined by using the built-in tilt sensor of the corresponding terminal. It applies to this innovative RHEWUM function as well: all which handle screening and bulk materials benefit from this unique technology!

Due to the great demand the freebie RHEWUM ScreenCheck App will also be available for the Android™ operating system from 1st of July 2015. Since September 2014 the RHEWUM App is already available for Apple users in the App Store - from next summer all features are also be ready to download for Android™ users on the Google Play™ store.