MELT FILTERS | EQUIPMENT
Melt filter makers target high volume and quality
Rising quality demands and increasing use of recycled material means melt filters are on the consideration list for many
compounders.Peter Mapleston reports
Whether for removal of gels from compounds intended for thin film production, or separation of non-melts from contaminated post-consumer waste, screenchangers and other melt filtration systems are increasingly frequent additions to plastics compounding lines. Melt filtration equip- ment ranges widely in its throughput capacity, filtration performance and level of process and operational automation, meaning there is likely to be a filtration unit available that meets most compounding requirements. As the result of a redesign of its melt filters for
removal of contaminants and gels and support for melt homogenisation in high-output compounding lines, Maag Group says it has been able to reduce maintenance requirements and improve opera- tional reliability. The company’s portfolio includes continuous melt filters, semi-continuous melt filters with high-speed hydraulics, and discontinuous melt filters for batch processes or where continuous processes are not required. Maag’s established DSC and CSC piston
screenchangers are available with three different cavity options: the standard round cavity for very high filler contents; the enlarged ‘PE’ cavity designed to provide versatility for balancing throughput and filler loading; and the ‘R’ cavity with a curved screen that is claimed to provide four times larger filter area. Maag cites numerous improvements across the
product portfolio, including optimised flow channels through modified screen-bolt guiding, improved safety guarding, low viscous sealing possibilities, and a metal hybrid seal system for all
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flat-slide, HSC or FSC-D3 melt filters. This new metal-hybrid seal can be used over a wide range of viscosities and at temperatures up to 320°C. The company says it can be used in operations running with melt viscosities from 5 to 5,000 Pa.s (inde- pendent of temperature) and is easily exchange- able with a standard sealing ring.
Extending options Also building on established product lines is Gneuss Filtration Technology, which has intro- duced an additional size across its line of Rotary Filtration Systems. The RSFgenius, SFXmagnus, SFneos and CSFprimus models are now available in a size 110, which the company says offers almost 20% more active screen area than the size 90 depending on the specific model. Screen area goes from around 300 to 400cm2
.
Main image: There’s a melt filter option for almost any plastics processing task. Fimic’s GEM design aims for high throughput, heavily
contaminated applications
� July 2021 | COMPOUNDING WORLD 53
IMAGE: FIMIC
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