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Author
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Topic: Bubbles on PET sheet extrusion
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pn29159
Member Posts: 1
From:Hong Kong
Registered: Mar 2003
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posted March 07, 2003 01:21 PM
   
Hi!
I am a PET production line process engineer,
we have APET and PETG sheet production with the range from 0.12 mm to 1 mm thickness; for those years, i have a serious problem on the quality of product, there have bubbles and very small black spots comes out from the T-Die of the twin screw extruder, but sometimes may not happen, but sometimes happen for a period of times (nearly few days or a month).
Can anyone give me some suggestions or method to solve this problems?
Thanks a lot! IP: Logged |
Steve H
Moderator Posts: 191
From:New Zealand
Registered: Jun 2001
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posted March 07, 2003 01:51 PM
Hi
I really do prefer replying to a post where the poster has put his/her name to it, first name is fine  Bubbles in the sheet: if there's any sign of degredation in the material surrounding them, I'd look at drying. Black specs: Are you running regrind? Otherwise look for any hangup points and give everything a good clean regularly. Steve H IP: Logged |
M.Blader
Member Posts: 3
From:noplace
Registered: Jun 2003
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posted June 17, 2003 09:07 PM
Sounds like a moister problem, or mabey contamination.
Are the blisters sparsed out across the sheet
or are they globbed together?Curious:
What does your head pressure(s) do when the blisters hit? IP: Logged |
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