TECHNOLOGY | MACHINERY MELT FILTRATION


Filters use automation to cut operator intervention


ADG Solutions has made improvements to its CFO Line of continuous melt filtration systems, while also adding a new model. It says that its CFO (Continuous Filter


Operation) models can operate automati- cally during a shift, with minimal operator attention. As extruded material enters the unit, it passes through a stainless-steel screen plate that is micro drilled and hard faced, filtering contaminants that are caught on the screen-plate surface. When waste builds up and back pressure reaches a pre-set level, a rotating blade sweeps the screen and removes the contamination through a discharge port. CFO models handle a broad range of


materials and the filter can cope with up to 10% paper and other foreign objects – in- cluding contaminants such as metal, wood, textile fibres and unmelted plastic granules. Recent refinements include: a


new scraper design to handle smaller purges; updated computer program/controls which allows the number of scrapes between purgings to be varied, so the user can maximise


TOOLING Hybrid tool adds layering efficiency


Guill Tool says that a new version of its 800 series of extrusion tooling – known as 800 series Hybrid – has benefits in applications that typically use cross- heads and inlines.


In some typical applica-


tions, layers of the same material are applied multiple times with a single die. This method is used to reduce the chance of errors caused by gels breaking through a thin


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wall, weld lines, inconsistent wall thickness, plus material and process variations. Other errors include difficult-to-process materials and demanding applica- tions where there is zero fault tolerance. The 800 series Hybrid was designed to overcome these problems. Its efficient design reduces cost and size, compared to other methods of overlapping layers, says Guill.


PIPE & PROFILE EXTRUSION | October 2018


The main benefits include: eliminating weld lines in materials through patented overlapping technology, resulting in a more consistent finished product; reduced sensitivity to changes in viscosity; reduced sensitivity to changes in line speed; many material and multi-layer application possibilities; the ability to work in all tubing and jacketing applications with a wide range of


materials; low residence time; compact design; and a low tolerance stack-up error factor. Overall, the main benefit is an improvement in concentricity, says Guill. The new tool reduces


stagnation, because overlapping layers are more inherently balanced than single layers and also because each semi-deflec- tor is ‘tuned to flush’. � www.guill.com


www.pipeandprofile.com


contamination collection; and a thicker harder screen plate filter with more uniform hole quality. Before the end of the year, a new diamond hard plate surface will be available for aggressive and abrasive processes. This will make screen life up to three times longer than the existing design. Its latest model, CFO 25, offers a 10%


larger screen surface area, while the cover includes 360 degrees of studs – which fully seals the surface and prevents any leaks. The robust design tolerates much higher pressures of up to 3500 psi, says ADG. � www.adgs.net


PVC


Boosting PVC tube capacity


Maillefer says that im- provements to its PML 032 Explore extrusion line have allowed a 33% increase in the production capacity of PVC medical tubing. “We wanted more


speed from our extrusion lines for soft PVC intrave- nous (IV) tube and we got it,” said Philippe Giovan- grandi, technical sales director. Improvements to the cooling section have helped to boost capacity by more than a third. At the same time, the


extra performance called for more melt flow, which was found by increasing the extruder size. Overall, the PML 032 Explore line gives more performance while keeping within a compact layout, he said. � www.maillefer.net


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