Posts: 19
From:Mumbai, Maharashtra, India
Registered: Jul 2001

posted August 03, 2004 01:49 PM               

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In twin screw counter-rotating extruder for LDPE foamed sheet manufacturing, what is the most ideal position of the gas injection port (I'm going to use carbon dioxide as blowing agent, i.e is it vertically upwards, downwards or sideways on the barrel. Vertically upward or downward seem in-convenient because of the sharp edge formed by intersection of the two twin bores.

Can experts guide me on the subject?

Rajkumar

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Posts: 47
From:
Registered: Jul 2002

posted August 05, 2004 07:15 PM               

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Gas injection is routinely done at either the 3 o'clock or 9 o'clock position...

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Thomas Black
PPS, Inc.

www.ppsincorp.com

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Posts: 19
From:Mumbai, Maharashtra, India
Registered: Jul 2001

posted August 12, 2004 11:13 AM               

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Thanks Thomas for your clarifications on the position of port.
Any idea about the typical nozzle hole sizes used for gas injection? Typical flow rates of liquid CO2 for my foam densities will go from 5 litres to 10 litres per hour. The pressures range between 5000 - 8000 psi, at nozzle.
Who supplies gas injection nozzles?

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Posts: 19
From:Mumbai, Maharashtra, India
Registered: Jul 2001

posted August 13, 2004 08:41 AM               

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What is the use of air-compressor in produced polyethylene foam sheet and where is the compressed air introduced in the horizontal bubble.

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