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twin screw extrusion of NY6

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Topic: twin screw extrusion of NY6

jsonsino
Member

Posts: 1
From:Pennsylnania
Registered: Mar 2005

posted March 01, 2005 09:46 AM

I'm looking for general corotating twin screw processing guidelines for manufacturing color masterbatches in NY6. Temperature profile, L

ratio, amount of mixing etc.

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Tom C
Moderator

Posts: 470
From:Brodheadsville, PA USA
Registered: Jun 2001

posted March 01, 2005 10:46 AM

Nylon 6:

Kneading for melting: 520-580F
After initial melting: 480-500F

Screw configuration and L/D depends on whether you will add the pigments at the feed throat or downstream. In eithe case Nylons need a longer than usual melting block set. Pigments which need to be worked also will need a longer set of kneading blocks becasue of the low viscosity melt of nylon. A 3 lobe twin screw might be a good choice for this work.

Pigments should be selected for chemical and thermal stability with the high processing temperature of nylon, and the acidic melt.

A sample process for Nylon 6 with 40% TIO2 is shown below:

The process was developed and documented using PolyTech's TXS software.

Tom Cunningham

www.ExtrusionTechnicalServices.com

[This message has been edited by Tom C (edited March 01, 2005).]

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