Torque needed for a 20:1 General purpose screw - Plastic processing forums for extrusion information and advice and for other feed screw applications.

UBBFriend: Email This Page to Someone!

Plastic processing forums for extrusion information and advice and for other feed screw applications.

Injection Molding, Thermoplastic

Torque needed for a 20:1 General purpose screw

profile | register | preferences | faq | search

next newest topic | next oldest topic

Author	Topic: Torque needed for a 20:1 General purpose screw
Philco Member Posts: 3 From:Canada Registered: May 2003	posted April 05, 2004 10:14 AM Hi, I want to know if someone know how much torque is needed to make a general purpose screw turn, with a d/l ratio of 20:1 and, let say a 45mm screw dia. Also, if someone know the same thing with a screw designed for crystal polystyrene. Since one of our older machine have his hydraulic motor damage, it will help me to find a replacement hydraulic motor to tryout. Thanx alot! Phil IP: Logged
Tom C Moderator Posts: 314 From:Brodheadsville, PA USA Registered: Jun 2001	posted April 05, 2004 04:07 PM See the discussions on output calculators and torque calculations under "Extrusion". Tom C IP: Logged
Philco Member Posts: 3 From:Canada Registered: May 2003	posted April 05, 2004 04:57 PM Tom, Since I have read both of them, it seem to be on the breakage torque. I'm searching for an approximate measure of how much torque is need to run our screw. We run it at 120-150 rpm. It's a 45mm 20:1, running crystal polystyrene. Is it something between 1000 and 2000 nm? or more than that?? IP: Logged
TomBlack Moderator Posts: 40 From: Registered: Jul 2002	posted April 05, 2004 09:35 PM Philco, As an amorphous material, XPS is easily capable of 8 to 10 PPH/HP. Therefore, given a 45mm screw with a max output of approximately 1 PPH/RPM the input torque should be between 0.1 to 0.125 HP/RPM (or approximately 715 to 890 N-M's)... ------------------ Thomas Black PPS, Inc. www.ppsincorp.com IP: Logged
Philco Member Posts: 3 From:Canada Registered: May 2003	posted April 06, 2004 10:33 AM Hey Thanx Thomas! It's seem to be good, but I would like to have some confirmation from some poeple about this results, just to be sure that is correct. Again, Thanx alot guyz! Phil IP: Logged

All times are ET (US)	next newest topic \| next oldest topic
Administrative Options: Close Topic \| Archive/Move \| Delete Topic
	Hop to:

Contact Us | Feed Screw Designs

Powered by Infopop www.infopop.com © 2000
Ultimate Bulletin Board 5.45a

Ask the experts! These processors and consultants have been there and done that. Post your enigma now!