Homebrew PCBs

That is good that it is not paper based since the variations would be
larger.

I still would be suspicious until the dimensional effect of drying is
verified.  It might very well be insignificant on small board sizes.

As a reference, we are having custom injection molded parts made.  The
plastic is very dry after the molding process and it slowly over the next
half year or so absorbs humidity to finally stabilize in size and water
content.  

 

To avoid size problems with matching new and old parts, the new parts are
kept in near boiling water for about 40 minutes to quickly reach the stable
point.

Bertho

 

From:  cunningfellow   Sent: Thursday, May 23, 2013 19:08



> Boman33 wrote:
>
> That is an interesting piece of information
> about drying the film before printing. One
> more variable to test.
>
> I worry though that the artwork will change
> dimensions as it reabsorbs humidity but I do
> not know how significant it is. Of course
> that also depends on the size of the artwork.
> 
> Maybe dry it again before imaging onto the
> PCB.

The base material is a dimensionally stable
non-water-absorbing plastic.

It is only a thin gelatine coating on the top
than needs drying.





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