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TOPIC: Extruder required for triple insulated

Re: Extruder required for triple insulated 1 year 8 months ago #2272

Skin-Foam-Skin co-extrusion within a single crosshead is common for coaxial cable manufacture.

Quick change colorant systems allow the inner layer to be switched with the outer layer allowing almost instantaneous color change (middle layer being typically neutral color).

Main thing for this conversation to continue is to know exactly what product they are trying to manufacture in the first place.

Erik Macs
VP North American Machinery Sales
Fine International Corporation
148 Oak Street
Natick, MA 01760 USA
508-315-8200 fax: 615-658-1988
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Re: Extruder required for triple insulated 1 year 8 months ago #2273

Thanks again for jogging my memory Erik. I started in the telco/ coax part of the business so you would think I would recall at least skin-foam and the later skin-foam-skin. Ditto re quick change color applications.

I'm still betting however that Conins was referring to power cable but then I may just have a bit of inside information.

Peter J. Stewart-Hay
Stewart-Hay Associates
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Re: Extruder required for triple insulated 1 year 8 months ago #2274


right as always point being made was that there is a lot of technology for multi layer extruding out there and probably with creativity applicable to cable. Additionally wire did not mention if he was making cable or other wire product.

There are people that are using wire making principles to make medical tubing that are coating wire like magnet wire, putting a braid over it, additional insulating varnish, and then extruding over top of that. some people are doing this all oninline process. then the conductor is extracted from the insulation and the resulting tube used to solve cardiac problems

again it may have nothing to do with what WIRE is doing but that product could not have been made without a lot of wire industry technology.

I also would not be surprised that idea of blowing film came from wire industry
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Re: Extruder required for triple insulated 1 year 8 months ago #2275

Thanks all of you for your inputs.
I should have been more specific.
I am talking about triple insulated magnet wire.
That is-Magnet wire+ Polyester+Polyester+Polyamide.
Material-Coppper wire.
Size-0.1 mm to 1.2 mm-Bare diameter.
Increase in covering-0.2 mm.
Can all the three layers be simultaneously??

Any manufacturer of such extruder is there?

Thanks and regards,
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Re: Extruder required for triple insulated 1 year 8 months ago #2276

Well my face is red.

Knowing the locale of the the writer and knowing of some serious power cable projects just starting up near there, made me believe that this was a power cable query.

How wrong I was and how right Eric and Spectre were. So much for jumping the gun and so much for my intelligence gathering resources on this occasion!

Spectre, I believe this query is right down your alley. Would you care to respond?

Peter J. Stewart-Hay
Stewart-Hay Associates
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Re: Extruder required for triple insulated 1 year 8 months ago #2277

Now that we know a little more..........

First off I do not think that there is anyone that makes a material that would allow you to extrude this type wire. Maillefer (I am spelling it phonetically) made equipment to extrude magnet wire. There were just not much in the way of materials that worked. There were a couple in USA that tried it but the wire was only good for oil filled transformers. The material continued to cure in the warehouse which is obviously not good for coil winding.

Depending upon what you have to work with equipment wise, you can do it a couple of ways. If you have only a single oven system then you need to have a 3 part applicator. Since you are putting on 3 materials you have to know how much of each you need to put on of each type. This helps you determine how many passes of each type enamel. Depending upon the type of applicator you might be doing about 3-5 passes of enamel #1, 2-3 passes of #2, and 2-3 passes of enamel #3. Since you have a single oven and 3 different enamels you will have to operate at compromise conditions meaning speeds and tempertrues you might not normally use for only a single or dual coating.

I also know of a system that had 3 separate ovens. Oven 1 was for enamel 1, oven 2 for enamel 2, and oven 3 for enamel 3. Since there are three separate ovens, you adjust the temperature of each oven so that you can run the wire at the optimum speed which would be as fast as you can make good quality wire.

You can also do two coatings on a system and then re-run the coated wire through another oven to apply the third coating.

years ago triple coating was a speciality and you could sell it for "good money" so it did not matter if you had to run the equipment in a compromised condition meaning SLOW.

Today some of the wire that is used in motors controlled by VF drives is triple coated and since most of that is about 28 awg ( 1.0 mm) it needs to be processed as fast as you can make it.

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