Draw Down ratios for LLDPE tubing extrusion

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Draw Down ratios for LLDPE tubing extrusion

Postby Aric Keith on Mon Sep 19, 2011 4:39 pm

Has anyone here experimented with different draw down ratios for LLDPE tubing? I have historically used 1.6-2.0 for LDPE, but I'm finding LLD doesn't draw down as quickly. so I've used 1.5-1.7 max. I'm considering trying 1.2 because I'm still having to run a substantial airgap to get the tubing to draw down enough to make it through the sizing elements.

Thoughts? Any reason not to run low DDR?

Aric
Aric Keith
 
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