Posts: 9
From:UK
Registered: Apr 2005

posted May 11, 2005 05:08 PM               

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Hi guys, I am running an HDPE tube (various ID's & OD's (Eg 19mm ID wall of 1.6mm)and I currently use a brass sizing die with 18 plates. The first 6 plates are separated by 1mm washers, the next 6 by 1.6mm and the remainder by 3mm washers. Can anyone enlarge on why so many plates are needed? Also are there any other types of sizing die out there, be it design or material??

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Posts: 117
From:Allentown, PA - USA
Registered: Jun 2001

posted May 12, 2005 08:24 AM            

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One piece brass with a bore to match your existing "plate" sizing die, with cross drilles holes and a wall thickness of 0.015 or more, depending on your extrusion speed, water temperature and final product wall thickness.

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Posts: 1
From:The Netherlands
Registered: May 2005

posted May 12, 2005 08:50 AM               

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The amount of plates determines the minimal length of the calibrating tool, which is required to freeze the outer skin of the tube in order to create and maintain the correct OD: depending on melt temperature, line speed (output), etc.
Instead of your wafer-sizing tool processors also often use slitted bronze bushing sizing sleeves.
Other types of (adjustable)sizing sleeves can be seen on: http://www.rival.dk/ http://www.conpro-gmbh.de http://www.conpro-gmbh.de/cp_english/ eingang_e.htm

Regards.

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Posts: 117
From:Allentown, PA - USA
Registered: Jun 2001

posted May 12, 2005 09:12 AM            

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I like this idea Puktoffel
- thanks for that link.

[This message has been edited by louis33 (edited May 12, 2005).]

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