Extruded nylon net

[patprimmer]

I have a project that requires an extruded nylon net.

It needs to be a bi-axially oriented or square net.

The function is a rip stop located between the layers of a laminate of two co-extruded films, one being MDPE/LDPE and one being Pa/MDPE/LDPE

Size of the window is not all that sensitive, and can be anywhere from 10 mm to 40 mm.

The bumps at the knots is an advantage in the application as they provide a desirable surface texture to the final film.

It needs maximum filament or string strength, and knot strength approaching string strength.

I have tried polypropylene biaxially oriented net and it had sufficient strength, but it fibrillates when broken in the application.

It is essential that no fibres that will not accept wool dyes be rejected from the net on breakage.

Nylon does absorb the same dye types as wool.

I have made some nylon diamond net. The filament strength was good, but the knot strength (strength of the area where the knot would be where yarns cross in a conventional net) was insufficient.

I need this material to save a major project. Usage will be substantial (potentially about 2,000,000 Sq Metres PA)

I need it in Australia, but I am prepared to source from anywhere in the world.

So far I have tried to source from Melbourne Australia, two sources in Sydney Australia, Holland, Switzerland, USA, Greece and Taiwan.

If anyone has any ideas, I would appreciate any advice.

Regards

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[btrueblood]

Pat,

Have you considered multi-filament polyester or nylon yarn (versus monofilament). The knot strength should go up as the individual fiber diameters go down. I think polyester yarns have better knot strengths, but don't have any data to back that up.

 

[patprimmer]

This is extruded net, not traditional knotted net. They still call the crossover points where two yarns come together knots from tradition. It is commonly known as the "Netlon" process.

By the nature of the process, it must be a mono-filament string or strand.

The mono-filament is also a major advantage in the end use.

It is a process where the strands are extruded and cross inside the die, so it is in fact, a single strand, which divides into two strands then merges into two strands again to form the knots and strands.

I can describe the details if really necessary, but at this stage I can't see it helping, and it will be more like a paper than a post.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[ornerynorsk]

Netlon India? I'm not too familiar with this process and its applications, but this company came to mind. Best of luck on your sourcing.

 

[HDS]

It is unusual for us to be helping patpimmer.

How about an expanded net? I bought a bag of oranges last week that was was in a plastic net made by putting a pattern of slits into a plastic film. I don't know where to get it or if it is available in nylon. However, it could solve the "knot" strength issue.

 

[Pud]

Hi Pat,

This any use?

http://www.internetmesh.net/plastic_extruded.htm#search

also this UK company say they will do other materials apart from polyolefins:

http://www.boddingtons-ltd.com/company/process_extrude_mesh.htm

Sorry about the links - do not know how to make them 'active'!

Rgds

Harry

 

[dwightdixon]

There are a number of patents in this area. In the US, there are several large producers with a variety of materials used.

 

[patprimmer]

Dwight

A number of patents in what area, net, material for net, or fabric.

Who are the producers.

Harry.

Boddingtons could not help.

Internet just might have something.

Thanks for your effort.

ornerynorsk

I will search for Netlon India in case they can do better than Netlon UK and Netlon licence in Australia have done.

HDS

I already have a strong film. I need to add the net as a rip-stop for the film as the packs are filled with about 450 pounds of wool, then handled with hooks that penetrate the pack. I also need the surface texture created by the "knots".




Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.