Nordson Corp. will show new screen packs for BKG screen changers at Fakuma 2018.
Nordson is exhibiting in Booth A6-6109.
According to the company, the screen packs withstand the pressures of extrusion, providing machining filtration and optimum melt flow, with a longer working life and better reliability than low-end screen packs.
One key: A robust multi-layer structure that prevents failures caused by the pressure differential encountered during melt filtration. One such failure is “screen dimpling,” when mechanical stress forces screen layers into the holes of the breaker plate which supports the screen. Nordson said this distorts the screen, breaking the peripheral seal and allowing contamination to bypass the screen and become part of the end product.
Nordson precisely tailors the size of the screen pack to the dimensions of the cavity, eliminating the common worry of contaminants passing the screen pack at the edges. Also, all screen pack components are ultrasonically pre-cleaned during manufacturing to eliminate any contamination from oil and grease used in the weaving process.
BKG, based In Münster, Germany, supplies the screen packs in several different layer combinations.
“A key factor for efficient filtration is permeability,” said Stefan Woestmann, BKG application engineer. “The Nordson screen pack provides the optimum ratio of solid material and free volume, so that the polymer melt can use as many flow paths as possible to make its way through the filtration material.”