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  Extrusion, Twin Screw
  PYOH film extrusion

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Author Topic:   PYOH film extrusion

Posts: 1
From:New Delhi India
Registered: Dec 2002

posted December 19, 2002 03:09 PM     Click Here to See the Profile for Gautam   Click Here to Email Gautam     Edit/Delete Message   Reply w/Quote
we would like to make PVOH film which is used in embroidry as a lining.
We need to know whether this product can be produced on standard LLDPE blown film plant or on twin screw as this will produce lots of gases during processing. Any help will be appreciated.

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Posts: 5
Registered: Jul 2002

posted December 19, 2002 03:13 PM     Click Here to See the Profile for TomBlack   Click Here to Email TomBlack     Edit/Delete Message   Reply w/Quote
DuPont says there's no one (well, there is one in England) extruding PVOH. Most are using a coating process similar to pressure sensitive adhesive products. The problem is the melt temp and
degradation temp are so so close together that a number of plasticizers
and stabilizers are required to process this material successfully.
This greatly affects end product cost and quality. If interested in a development program, suggest a twin to process low molecular weight PVOH with water as a plasticizer (which flashes off at the die affecting product quality).

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