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soft touch application

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Topic: soft touch application

marco
Member

Posts: 1
From:
Registered: Oct 2004

posted October 28, 2004 10:33 AM

hello everybody!
we are making tests with a soft touch PP coating layer on an hdpe extrusion blow molded bottle. we had several problems to receive a homogeneus distribution of the soft touch layer. there were stripes from the positioning of the internal orifices in the slave extruder die. has anyone experience and an idea how to resolve this problem?
rgds

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Tom C
Moderator

Posts: 396
From:Brodheadsville, PA USA
Registered: Jun 2001

posted October 28, 2004 01:20 PM

Most problems in co-extrusion stem from two sources; 1)large differences in the viscosity of the materials as they meet. 2) Large differences in melt velocity of the flows.

By making some lab measurments and using non-newtonian flow analysis of the process flow problems like this can be diagnosed and resolved.

Your issue may have something to do with the distribution of the soft touch layer in the die manifold. Again flow analysis can help.

Please contact me direct if you would like more information.

Tom Cunningham
Extrusion Technical Services www.ExtrusionTech.com

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