Vibrating Screen Technology
With overlength separators from SPALECK, you can achieve the cleanest production results in granulate production. Misplaced grains and long grains are now a thing of the past.
We would be happy to advise you on any questions you may have regarding SPALECK’s overlength separators.
For optimal product quality
During the production of plastic pellets, excess lengths (“longs”) occur in the production process during start-up and shut-down, which interfere with the further processing of the pellets. The oversize separator is part of our line of screening machines for the chemical, pharmaceutical, and food industries and helps you screen out these oversize particles from the desired granule size. In the jargon of processing technology, this involves separating the bad granulate from the good granulate. The oversize separator is a special type of screening system used for inspection and protection, designed to separate oversized material particles. If, in addition to simple oversize screening, further screening of the granules is required, the use of a granule screening machine is recommended.
The video provides a good insight into how an over-length separator works and how easy it is to operate. This screening machine was designed to reliably remove oversized particles from a specific type of polymer plastic granulate. The operations manager provides comprehensive feedback from the user’s perspective.
Task: Screening of difficult-to-handle granules that still tend to clump together during this production step
Result: Highly reliable separation and screening of long particles generated during production, as well as precise control screening of the valuable specialty polymer pellets
Thanks to the machine’s special design, the benefit for the customer is clear: The SPALECK oversize separator makes machine operation and cleaning both very simple and efficient. As a result, the screening machine provides optimal support for the high quality standards in the production process.
We developed the solution for the customer in collaboration with them at the SPALECK TestCenter. “The collaboration was very productive and focused on finding the best solution for us.” “Starting with our raw material, we tested various configurations until we were able to achieve the best result for us,” the customer reports.
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Optimal Processing Technology for Plastic Granules
When screening granules, a different procedure must be followed than when screening other products (such as recycled materials or biomass). As the diameter of the granulate is often the same size, the excess lengths end up in the fine granulate. Either the wrong processing technology (screening technology) was used or the screening surface of the screening machines did not meet the requirements of the granulate. In addition, the use of strong vibrations from the vibration motors is counterproductive, as this causes the granulate to “bounce”. This increases the likelihood of it falling unintentionally through the perforation to the fine granulate during the screening process.
To counteract the above-mentioned problems in the pellet production process, an overlength separator is used. As the diameter of the pellets is the same, the separation into good and bad pellets must be carried out using the pellet length. In order for the overlengths to be removed from the pellets with a high degree of separation, it is necessary for the pellets to slide over the Screening area as flat as possible. We support you here with machine dynamics that are precisely adjusted to your product. For example, we use the vibration parameters or the machine’s angle of inclination to ensure that your granulate is separated efficiently. The frequency of movement is also crucial: the faster the frequency, the more likely it is that the pellets will bounce and find their way to the good pellets. A low frequency of the vibration motors is therefore necessary to prevent this “bouncing effect” and the long pellets from standing up.
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