polymer equivalent to a bi-metallic strip?
polymer equivalent to a bi-metallic strip?
(OP)
Hi all, Is there a commercially available all polymer/plastic equivalent to a bi-metallic strip? I am looking for something that could be integrated in an injected moulded product. It needs to be reasonable cheap.
Many thanks in advance for any advice or leads.
Many thanks in advance for any advice or leads.





RE: polymer equivalent to a bi-metallic strip?
Overmould with same polymer but no glass fibre.
It will certainly bend toward the glass filled side when heated.
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RE: polymer equivalent to a bi-metallic strip?
RE: polymer equivalent to a bi-metallic strip?
RE: polymer equivalent to a bi-metallic strip?
It would have a very slow response rate as (depending on a number of factors) it takes hours or even days to absorb enough to swell noticeably. This probably makes it unworkable in the real world.
A glass filled nylon on one side and an unfilled on the other might work. Nylon 6 is probably best as it absorbs most water.
Re water or temperature, re material choice, a lot depends on other factors
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RE: polymer equivalent to a bi-metallic strip?
RE: polymer equivalent to a bi-metallic strip?
I am a committee member of PIMA (Plastics Injection Moulders Association).
http://www.pima.asn.au/home.asp
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RE: polymer equivalent to a bi-metallic strip?
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RE: polymer equivalent to a bi-metallic strip?
You are correct. Although the glass fibre severely reduces expansion due to moisture absorption, it also increases modulus to an unworkable extent.
Co-extruded films with nylon/tie layer/PE curl a lot on moisture absorption, but are probably to thin for your purposes. It may be possible to make them very thick by the so called film casting process where melt is extruded onto a set of rollers then pressed to size by the rollers as they freeze.
The costs of samples by this process will be high.
If it is thick enough to have the required rigidity, it will have a VERY slow response rate.
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RE: polymer equivalent to a bi-metallic strip?
http://www.iop.org/EJ/abstract/0964-1726/2/1/001
There is a very large pdf in the above search that leads to this.
http://n
I don't know if any of the above info will be of use but may give you some leads. At leas you know people have worked on same.