Posts: 4
From:Science Hill
Registered: Nov 2005

posted November 14, 2005 08:16 PM               

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The problem is my customer wants a higher gloss on a part to match to another part in color and gloss, the part is a Nylon seat handle mixed with color at 2% and it is grained to match. The color is good and so is the grain its the gloss or there lack of gloss that they are not happy with. The tool is single cav. cold runner, gated from the side of the part. I have tried adjusting the mold temps,I started out at 145 which is what it was sampled at, from there I went 10 degrees higher in this order 155-165 then went 165-185,185-200 and of course at 200 I got pin marks and a longer cycle time. So i tried something out of the box and went to 80, from all of the temp changes I got no change on the gloss, it never got better or worse only on the 200 mark and which it got worse. I am thinking the only way to change the texture is to change the grain on the Class A side. Any ideas would be helpful. Thanks

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Posts: 651
From:Brodheadsville, PA USA
Registered: Jun 2001

posted November 14, 2005 09:56 PM               

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Woody,

Most straight nylon grades I have seen mold with a nice gloss. What kind of nylon are you using?

What is the base resin of the color concentrate?

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Best Regards,

Tom Cunningham

Extrusion Technical Services

www.ExtrusionTechnicalServices.com

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Posts: 4
From:Science Hill
Registered: Nov 2005

posted November 15, 2005 10:36 PM               

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I will get the info. in the morning, the reason I don't think that we can do it is because it has a matte finsh on it,I will get the material info. as soon as I can and the color.

Thanks for the reply.

[This message has been edited by woody (edited November 15, 2005).]

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Posts: 1
From:Zeeland MI USA
Registered: Nov 2005

posted November 27, 2005 04:07 PM               

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Woody,
I have a similar issue with polypro. Changing process perameters only affects the gloss a little bit. FYI after texturing, the tool is blasted with a mixture of aluminum oxide and glass beads which gives a tool its gloss level. You will want to have some data. We use a Gardner 60 degree gloss meter. Run a good process, measure the gloss, and blast the tool to bring your gloss in. The texture house or a good tool shop can help

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