posted May 03, 2004 07:29 PM            

I was wondering if anyone knew of a company who manufatures netting dies for square shaped nets. These type of dies are circular and have a reciprocating piston that creates the nets square shape.

posted May 04, 2004 11:00 AM            

I was not sure such a process even existed as described.

But here it is;

HOW DOES IT WORK ?

The extrusion die head is composed of 2 parts, a part A in the form of a mandrel rod (the knife) and a part B in the shape of a ring (the anvil), fitting one into the other. Part A is moved by reciprocating movement offering two working position, up and down.

Slots have been cut in part B all along the generating lines of its contact surface with part A.
When A is pressed down on B (down position), the plastic has no choice but to pass through the slots cut B to form vertical filaments. Slightly elevating the part A (up position) lets the plastic escape to form horizontal rings, which when cemented to the vertical filaments, form a tubular networks and its meshing can vary infinitely depending on the number and size of the slots, the reciprocating movement rate of part A, the conforming device size and the production speed.

H = high of horizontal mesh, set by the frequency generator. This value can be adjusted in production.
W = width of vertical mesh, depend on slots positioning.

All the above pictures and text are from the company's web site.

The company is here:
http://www.corelco.com/index_us.htm

This is the only source I could find.

Tom C

posted May 04, 2004 09:02 PM            

The plastic netting process described by Tom C was invented and developed by a company here in the U.K. called Netlon.

Their website is:
http://www.netlon.co.uk/_industrial/introduction.htm

There is a heavy duty product used in road construction made by the same group of companies called 'Tensar'. Their website is:
http://www.tensar-international.com/

This product is made by pin-rolling sheet polyethylene and biaxially streching it on a stenter

posted May 04, 2004 09:35 PM            

Thanks for the help.

I got the impression those companies you listed only supply the net, and not the extruder hardware.

Are there any companies in England which supply the hardware?

Are you implying that Corelco is supplying a protected proprietary process?

Thanks,

posted May 05, 2004 02:29 PM            

I have done quite a bit of work for Netlon and Tensar in the past. I don't think they supply any hardware, in fact they tend to keep their process very much to themselves.

As far as I am aware Netlon was the first company to use such a process - I seem to remember that, at the time (late 70s and early 80s) they won a few design and innovation awards. See http://www.royalsoc.ac.uk/templates/press/releasedetails.cfm?file=266.txt

I don't know what the legal situation is regarding Corelco. The extruded net in your diagram appears to be a lot heavier than that produced by Netlon's process and the die design is significantly different.

posted May 05, 2004 03:46 PM            

Seems like a worthwile effort. Thanks for your help Pete.

posted April 28, 2007 05:02 AM            

Please send me your detail requirement &so i can revert.

quote:

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Originally posted by felix:
Hello,

I was wondering if anyone knew of a company who manufatures netting dies for square shaped nets. These type of dies are circular and have a reciprocating piston that creates the nets square shape.

Thanks in advance!

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