Whatever solution you are looking for, Dinnissen has a wide range of innovative solutions ready to sieve powders, grains and granules quickly and reliably with exactly the desired end result.
In the feed and food industry, the requirements in the field of safety and hygiene are becoming increasingly strict. The machines used in these industries must also meet high standards. A Centrifugal Sifter from Dinnissen is designed to meet all hygiene and safety requirements within the sector. Centrifugal Sifters, for example, can be supplied with approval for ATEX Zone 20, which means that the sifter can also safely process explosive substances. For example, sifting machines that are integrated within a pneumatic process must meet additional requirements with a design pressure of more than 0.5 bar overpressure. Dinnissen provides a Pressure-Equipment-Directive (PED) inspection and delivers the screening machine with an approved Notified Body certificate.
A Centrifugal Sifter from Dinnissen can process capacities from a few kilograms per hour to more than 30 tons per hour. Dinnissen also offers specific solutions for even larger product quantities. The capacity of the sifter depends, among other things, on the product that is to be sifted and the perforation diameter used for sifting. Mesh sizes can vary between 250 and 2000 µm, but very fine-meshed products of > 75 µm can also be processed by the Centrifugal Sifter.
Whether a nylon fabric sifter can be used for sifting the most fine-grained products depends on the product type and the specified requirements. If a nylon fabric sifter does not suffice, a stainless-steel sifter can be chosen. In addition, Dinnissen offers the option of ultrasonic technology. This is a high vibration frequency of the sifter, which - in addition to centrifugal force - contributes to the sifting process.
In a Centrifugal Sifter, there is a cylindrical sieve chamber that rotates on its axis. The product to be sifted enters this sifting chamber via a pneumatic conveying system or by gravity. Once in the sifting room, the product is pressed against the walls of the sifting basket by rotating motion. This principle is called centrifugal force. The walls of the sifting basket have perforation holes through which the product of the desired size can exit. Material and contaminants that are too large remain in the sifting room and are led to a separate exit of the machine. In this way, this residual material can be easily removed from the centrifugal sifter after the sifting process.
The various adjustment options ensure that the Centrifugal Sifter can be used for a wide range of product types, capacities, and environments. Dinnissen has already installed more than 500 Centrifugal Sifters for a variety of applications and therefore has a suitable sifting solution for every demand.
In addition to the Centrifugal Sifter, Dinnissen has developed the Wingdoor Sifter, with extra wide opening doors. We also have Vibrating Sifters and Rotating Drum Sifters in-house. We are happy to advise on the best suitable solution, for the desired sifting result.
Not all products can be sifted with the same size mesh openings. The diameter of the holes in the sifting basket depends on the desired fineness of the product that is to be sifted. Setting up a sifter per product is not only expensive but also unsustainable and unnecessary. It is much more practical to choose a sifter that is suitable for multiple product types and grain sizes. The Wingdoor Sifter can sift more than one product type. Because of the speed at which the sifting baskets can be replaced, the Wingdoor Sifter is ideally suited for processing different products and grain sizes. Another advantage of the Wingdoor Sifter is the ease by which an operator can access all parts. The sifter is quickly and safely accessible by opening two large inspection hatches. The design of the sifter ensures an ergonomic workplace for the operator.
The Wingdoor Sifter is a centrifugal sifter, which separates particles by the force with which these particles are pressed against the drum. A sifting perforation is installed in the drum. The smaller grains disappear from the drum through the perforation holes. Grains that are too large will remain in the drum. The sifting perforation can be adjusted to the desired final fineness of the product that has to be sifted. The Wingdoor Sifter can be integrated into existing conveyor systems, tailored to the existing line and the desired sifting results.
The Wingdoor Sifter distinguishes itself by its large inspection doors, which can be opened upwards. This ergonomic design allows operators quick and easy access to all important parts. In addition, the sifting baskets can be replaced ultra-fast. These features ensure that the Wingdoor Screening Machine is often used in processes involving many product changes.
The foundation of the Wingdoor Sifter is a cylindrical sifting basket. The basket rotates on its axis and the centrifugal force created by the rotation of the sifter presses grains or powders against the basket. There are perforation holes in the basket, the size of these depends on the desired final fineness of the product to be sifted. Because the product is pressed against the basket, grains or powders that are small enough to pass through the perforation holes disappear from the basket. The product that is too large to be flung through the holes remains in the basket. In this way, large quantities of product can be sifted quickly.
The large wing-shaped opening inspection hatches allow the basket to be replaced quickly and efficiently with a basket with a different perforation diameter. In addition, this allows the screening machine to be thoroughly cleaned. This also makes the Wingdoor Sifter very suitable for processing powders, grains and granulates where hygiene is extremely important.
Besides the Wingdoor Sifter that works using the centrifugal sifting principle, Dinnissen also has Vibrating Sifters, In-line Sifters and Rotating Drum Sifters. Together we can determine the best solution for your product and your production process.
We always aim for the most efficient sifting process possible, with as few resources as necessary and the best possible result. As desired, the sifter mesh of the drum is equipped with different perforation sizes to accommodate a variety of products. For example, the finest product particles can be separated in the first part of the sifting drum, to collect the desired product with the right size in the second part of the sifting drum. Larger chunks are discharged and returned to the process through a separate exit. This ensures that as little product as possible is lost in the production process.
A Rotary Drum Sifter (1 or 2 decks) can be equipped with different sifting perforations. A product can be divided into two groups (fine enough to go through the perforations and too large to go through the perforations), but for example also in three groups. In this case, at the top of the sifter, finer perforations are used through which only grit can pass. The further down the chunks or grains go, the larger the perforations become. The chunks that are the right size for further processing then fall into the lower section. The oversized chunks remain and can be brought back into the process.
The drum sifters are -depending on the desired capacity- available in various construction sizes. Extra-large types are also available for cleaning raw materials. In this variant only impurities are separated. Rotary Drum Sifters can be used for different materials. In addition to dried granules or chunks, more moist and sticky mixtures can also be processed by a Dinnissen Rotary Drum Sifter.
The Rotary Drum Sifter is an inclined drum with perforations in the wall. The product enters the top part of the drum. Through rotation and gravity, the product moves further and further down the drum. Only the product that is small enough exits the drum through the perforation holes. Often the perforations at the top of the drum are so small that only the grit can pass through them. Further down, the perforations are as large as the desired chunk or grain size. The oversized pieces remain in the drum. In a Rotary Drum Sifter, the separation is non-destructive, which means that both the fine and coarse product can be (re)used.
Which sifting solution works best depends on the product to be sifted and the desired result. Please also have a look at our Centrifugal Sifters, Vibratory Sifters and Wingdoor Sifters. We will gladly advise you on the best suitable solution, for the desired sifting result.
In the feed and food industry, all processes must comply with strict requirements. Before a product is processed into a final product, a Vibrating Sifter can be used as a kind of control sifter to filter out the last contaminants from the product stream. The Vibrating Sifter helps producers at critical control points (CCPs) within the production process. A critical control point is a step in the food production process that can be used for (additional) control of the product flow. Critical control points are essential to verify that food safety is being maintained. A Vibrating Sifter from Dinnissen ensures that contaminants do not get a chance to be processed into the final product and removes dust in the product flow.
Every Vibrating Sifter contains a screening deck with horizontal vibration. Due to this vibration of this sifting deck, the smaller particles on the sifting deck fall through the sifting deck via the perforations. The larger particles remain on the sifting deck. There are various versions of the Vibrating Sifter. For example, several sifters can be mounted on top of each other. This creates different groups of product, selected for fineness. In addition, the sifting deck can move vertically, as well as horizontally.
The Vibrating Sifter can ensure that the product that cannot pass through the sifter perforations is moved horizontally by the vibration. As a result, this machine is also referred to as a vibrating sifter. Dinnissen's Vibrating Sifters are available in different (round and rectangular) versions, in various material types, including specific cleaning options with air, impact or ultrasonic vibrations. Ultrasonic vibrations create a more uniform movement, and the grains pass more easily through the perforations of the screening deck. This technique reduces the chance of clogging the sifting deck.
In a Vibrating Sifter, vibration is used to achieve separation of a mixture of granular materials. Vibrating the vibrating deck causes the material to move. The material that is fine enough falls through the perforations of the sifting deck. The mixtures to be sifted are often fed in by dosed dumping. The Vibrating Sifter should be mounted on a solid surface to prevent secondary vibrations from occurring at all. For different materials, parameters such as sifting angle, adjustment angle and imbalance of the vibrating motors can be easily adjusted and documented.
In addition to Vibrating Sifters, we also have sifters in house that work based on centrifugal force. In addition, we have developed the Wingdoor Sifter, a machine that is easy to clean because of the opening doors. We will be happy to advise you on the best solution to achieve the desired sifting result.
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Optimization of your entire process
At Dinnissen we will be happy to help you automate and innovate your entire process with customized solutions. Dinnissen can add value in every process step. Take a look at our solutions for each step of processing powders, pellets grain and granular materials: