Feasability of This Two-Shot Mold
Feasability of This Two-Shot Mold
(OP)
I am considering a two-shot mold and I am curious about the feasibility of this design. The profile of the 2nd shot, the wiper, can change for manufacturability. Also, I am curious about how to detail the interface of the two materials...some kind of interlocking geometry to increase bonding? The height of the softer material is appx .1" inch.

Thanks

Thanks






RE: Feasability of This Two-Shot Mold
Bayer had a technical bulletin about it some years ago.
Main applications were shopping trolley wheels and tyres and top quality screw driver handles. Cheaper screw driver handles use PP and PP/vulcanised EDPM (like Santoprene type) elastomers.
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RE: Feasability of This Two-Shot Mold
RE: Feasability of This Two-Shot Mold
With PP and PP/vulcanised EPDM alloys, the pp matrix and the PP will have about the same melt temperature.
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RE: Feasability of This Two-Shot Mold
Regards,
mtpi.us
RE: Feasability of This Two-Shot Mold
If both have similar processing temperatures, it then makes sense to over mould the harder part.
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RE: Feasability of This Two-Shot Mold
I am going to start talking to Mold makers/injection molders this week about the process. I think either two-shot or over molding will work in this case(?), it really comes down to mold cost and piece cost..and what my quantity... but as far as I know, two-shot is more efficient.
Thanks!
RE: Feasability of This Two-Shot Mold
I would strongly advise talking to rawv materials suppliers ang getting their support and sample mouldings etc before proceeding.
Possible suppliers are:-
Advanced Elastomer Systems (or whatever they call themselves now) with Santoprene.
Bayer with Nylon and Polyurethane.
DuPont
DSM
BASF
Wacker with silicone Rubber compounds, including thermoplastic matrix types.
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