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Author Topic:   PA 66 feed screw
shahriar
Member

Posts: 2
From:Berlin/Berlin/Germany
Registered: Oct 2002

posted October 23, 2002 02:26 AM     Click Here to See the Profile for shahriar   Click Here to Email shahriar     Edit/Delete Message   Reply w/Quote
Could you possibly guide me as follow:

1-WHAT IS THE FLIGHT DEPTH AT FEED ZOON
IN PET FEED SCREW.

2-WHAT IS THE COPR.RATIO PET'S SCREW


[This message has been edited by shahriar (edited February 09, 2003).]

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Peter P
Senior Member

Posts: 54
From:Nottingham, Notts., U.K.
Registered: Jun 2001

posted October 23, 2002 04:27 AM     Click Here to See the Profile for Peter P   Click Here to Email Peter P     Edit/Delete Message   Reply w/Quote
Shahriar,

At one time there were screws sold as nylon screws, which have a very short compression zone (~ ½ turn) with a compression ratio of about 3:1. See the bottom screw in the rack of screws on our webpage www.polytechconsultants.com/extrusion.htm.

However, we have shown that these screws are inappropriate - the screw design depends on the rheological and thermal properties of the material.

Regards,

Peter P

[This message has been edited by Peter P (edited 10-23-2002).]

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shahriar
Member

Posts: 2
From:Berlin/Berlin/Germany
Registered: Oct 2002

posted October 23, 2002 06:29 AM     Click Here to See the Profile for shahriar   Click Here to Email shahriar     Edit/Delete Message   Reply w/Quote
Dear Peter

thank you very much for your kind e-mail.
Could you possibly guide me to design the screw for injection molding PA 66.

Regards

Shahriar

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Peter P
Senior Member

Posts: 54
From:Nottingham, Notts., U.K.
Registered: Jun 2001

posted October 23, 2002 08:55 AM     Click Here to See the Profile for Peter P   Click Here to Email Peter P     Edit/Delete Message   Reply w/Quote
Shahriar,

You need to do a proper screw design analysis using one of the screw design software packages on the market along with your material properties.

Regards,

Peter P

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T.K.Palanisami
Senior Member

Posts: 17
From:Aalen, Germany
Registered: Nov 2002

posted November 30, 2002 10:05 AM     Click Here to See the Profile for T.K.Palanisami   Click Here to Email T.K.Palanisami     Edit/Delete Message   Reply w/Quote
Please visit the Dupont website //plastics.dupont.com/
from there you can find the product Zytel.. I thing you have to register your user name in the site so you can use their literature.
In their literature you can find the Zytel molding gudie. From there you can find the necessary information about the screw design to mold Nylon 66.

Normally you can use the general purpose screw for Nylon 66
All the best

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