Description
>Post processing
Little post processing is
usually required, the finish is achieved by dressing and texturing
the master part before casting the tool. After casting the part
there is only the feed and riser removal, although in some very
colour critical conditions the parts are sometimes painted.
(usually this is a colour pigment added to the resin)
The process steps can be summarised as
1. Manufacture a master part and dress to achieve the required
aesthetics
2. Ensure the master part is clean and sealed (some materials will
react with the silicone)
3. Establish a parting line and apply coloured tape around the
it
4. Construct a casting frame and after attaching a feed and risers,
suspend the master part in the casting frame
5. Degass the silicone and pour into the casting frame, degassing
the cast tool again to remove any entrained air and then leaving to
cure
6. When fully cured, remove the casting frame and cut open the
silicone to the coloured tape / parting line
7. The master model can now be removed, the tool reassembled, taped
together and sent for casting
