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RE: plastic forming

In message <> "Mostrom, Edward" <> writes:
> 
> Can you modify the process to push the plastic INTO an object... put your
> object INSIDE the box and reverse the air flow so that the plastic is pushed
> into a negative image?  This would give you the detailed texture on the
> outside of you plastic.

Instead, you can make a negative mould and drill *very*small holes into
it. Therefore the vacum system soaks through the mould. Yes you will have
some imperfections, as large as the diameter of your drills. 
I did the holes when the air-hardening clay was still wet, and using a 
thin wire. 
Certainly a negative mould is more difficult to make than a positive one 
(unless you have a numeric-CAD machine). However you can make first the
positive one and then when hard you can try to make the negative one.  

   Another aproach is to use a "sandwich" mould, making a positive mould
and a negative mould slightly smaller to allow the hot plastic to lie in 
between. This approach is much more complex to handle.

I need to acknowledge my Industrial Design friends: Edgar, Victor and
Roberto from Mexico's UNAM University who teach me all this useful stuff.
I recomend you to approach to other IDs for more detiled advice.

Hope it helps,

-- 
 Walterio                  

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