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air ring design - ldpe vs. hdpe

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Topic: air ring design - ldpe vs. hdpe

charliehagee
Senior Member

Posts: 13
From:Scranton, PA
Registered: Sep 2003

posted August 04, 2005 05:01 PM

We have a small blown film line and the manufacturer is out of business. What changes do I have to make in the air ring (single lip) to run HDPE? I am running LDPE OK but need to run HDPE. What about the air ring angle, should that be different?
Thanks.
Chuck.

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Bob Cunningham
Senior Member

Posts: 113
From:Amesbury, Mass
Registered: Nov 2002

posted September 25, 2005 07:22 AM

If you want to run HMW-HDPE, you might have gauge uniformity issues and very high pressure.

HMW-HDPE tends to come out of the die and go straight up before it blows out, so a straight-up design is typically used. For MMW-HDPE, that can probably run okay on a typical LDPE air ring.

Would need more information to give better details.

-Bob Cunningham

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