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Science Forum Index » Materials Forum » seek strong, hard to break plastic material...
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| Andrew... |
 Posted: Mon Jun 02, 2008 2:36 pm |
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We are seeking plastic type of non-metallic material to make boots buckles.
What is good choice of strong and difficult to break plastic material?
The spokes and rectangle frame of the buckle are around 1/8 inch diameter.
Thank you. |
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| Mark Thorson... |
| Posted: Mon Jun 02, 2008 6:35 pm |
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Andrew wrote:
Quote:
We are seeking plastic type of non-metallic material to make boots buckles.
What is good choice of strong and difficult to break plastic material?
The spokes and rectangle frame of the buckle are around 1/8 inch diameter.
Thank you.
Note that boots are often used in snow and slush,
so you need a plastic that won't become too brittle
at low temperature -- it should have a glass
transition temperature significantly lower than the
lowest temperature the boots would be used at.
Plastic isn't the best choice for this. All of the
ones I've seen are metal. If you want it to look
like plastic, you can powder coat a metal core,
or injection mold around a metal core.
You don't say why you want to use plastic here.
If you're planning to injection mold it, you can't
use most thermoset plastics. (Integrated circuits
are molded in thermoset plastics, but those are
very special formulations.)
The strength of the plastic will be highly dependent
on the filler. You might want a chopped glass fiber
filler for good reinforcement. The filler may need
to be treated with a silane coupling agent or some
other modifier to promote adhesion between the
filler and the matrix. The epoxy-fiberglass
used in printed circuit boards usually has a
characteristic green color because of the copper
used to promote adhesion.
A problem with any non-spherical filler is it will
entrain to the direction of flow during injection
molding. Clever design of the mold can take
advantage of this to increase strength in the
desired direction. In a buckle, you'd want the
fibers to be aligned along the length of the spokes,
but you may create a weak spot where the streams
flow together. There won't be any fibers bridging
this spot, so that's where it's going to crack,
unless you do something about that. |
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| Andrew... |
| Posted: Tue Jun 03, 2008 2:14 pm |
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"Mark Thorson" <nospam at (no spam) sonic.net> wrote in message
news:484483DC.F7579FC0 at (no spam) sonic.net...
Quote: Andrew wrote:
We are seeking plastic type of non-metallic material to make boots
buckles.
What is good choice of strong and difficult to break plastic material?
The spokes and rectangle frame of the buckle are around 1/8 inch
diameter.
Thank you.
You don't say why you want to use plastic here.
If you're planning to injection mold it, you can't
use most thermoset plastics. (Integrated circuits
are molded in thermoset plastics, but those are
very special formulations.)
We have used metal buckles, which caused problems in washing and drying. |
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| Mark Thorson... |
| Posted: Tue Jun 03, 2008 2:21 pm |
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Guest
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Andrew wrote:
Quote:
We have used metal buckles, which caused problems in washing and drying.
What were the problems? |
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| madcadman... |
| Posted: Wed Jun 04, 2008 3:34 am |
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could try delrin.
Also, use the plastic selection tools at www.ides.com
"Andrew" <no.spam at (no spam) microsoft.com> wrote in message
news:9Kg1k.552$L_.469 at (no spam) flpi150.ffdc.sbc.com...
Quote:
"Mark Thorson" <nospam at (no spam) sonic.net> wrote in message
news:484483DC.F7579FC0 at (no spam) sonic.net...
Andrew wrote:
We are seeking plastic type of non-metallic material to make boots
buckles.
What is good choice of strong and difficult to break plastic material?
The spokes and rectangle frame of the buckle are around 1/8 inch
diameter.
Thank you.
You don't say why you want to use plastic here.
If you're planning to injection mold it, you can't
use most thermoset plastics. (Integrated circuits
are molded in thermoset plastics, but those are
very special formulations.)
We have used metal buckles, which caused problems in washing and drying. |
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| Andrew... |
| Posted: Wed Jun 04, 2008 9:32 am |
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Guest
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"Mark Thorson" <nospam at (no spam) sonic.net> wrote in message
news:484599C5.D47FB5C5 at (no spam) sonic.net...
Quote: Andrew wrote:
We have used metal buckles, which caused problems in washing and drying.
What were the problems?
metal overheat in dryer, electro-plating dis-colored in wash. |
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| Mark Thorson... |
| Posted: Wed Jun 04, 2008 11:36 pm |
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Guest
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Andrew wrote:
Quote:
"Mark Thorson" <nospam at (no spam) sonic.net> wrote in message
news:484599C5.D47FB5C5 at (no spam) sonic.net...
Andrew wrote:
We have used metal buckles, which caused problems in washing and drying.
What were the problems?
metal overheat in dryer, electro-plating dis-colored in wash.
Was this a microwave dryer? If not, why would plastic
not do the same thing?
If you used the metal part as a core for powder coating
or injection molding, you would not electroplate it.
You might pickle it shortly before coating or molding
to improve adhesion. After coating or molding, it would
be sealed againt the environment and not discolor or rust. |
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