Re: [rp-ml] injection molding into SLA cavity

From: Sadegh Rahmati (
Date: Fri Aug 12 2005 - 18:39:13 EEST

Hi Alex,

In addition to the information you can get from the paper on Direct AIM
tooling by Prof. Phill Dickens at Loughborough University, you must be
very careful with injection moulding parameters settings.

Don't worry about sticking the ABS to the mould, it won't. If you work
with your AIM tool carefuly, you may get 500 shots successfully. If you
need detail information, let me know.

Good luck

> I once read a journal paper (International Conference on RP) about some
> grad
> student who coated Z-Corp plaster mold cavities and injection molded into
> them but I was dubious about his description of the outcome.
> I'd like to try something similar with SLA. I'm proposing to create a
> core/cavity set that can be secured to aluminum blocks for molding (mainly
> for mold design review) with a very small injection molding press. Since
> SLA materials are not thermoplastics, the worst thing that will happen is
> that the polymer (I'll probably use ABS) will stick to the mold or the
> mold
> surface will oxidize and degrade from the heat/pressure.
> What do people think about trying this out with Somos Nanoform which is
> post-cured? SLA is getting so much cheaper now than it used to be that
> this could be a neat way to "prototype" molds in the future. I'll
> probably
> just use or some very low-cost vendor since this is just a
> quick experiment really.
> Any recommendations on polymers which might not be too sticky?
> I'm trying to mold a small flat part which is about 2 in^2 in projected
> area
> and about .1" thick.
> ~alex
> Alexander Do
> Research Assistant
> Ford Prototyping Studio
> University of California, Berkeley
> <>
> 2117 Etcheverry Hall
> Berkeley, CA 94720-1750
> (510) 643 9486

Dr Sadegh Rahmati
Research and Development Centre of Advanced Manufacturing Technology
Tel/Fax: +98 21 7314105

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