- Need Help!- Vacuum Forming Issue: Rough Surfaces
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Vacuum Forming Issue: Rough Surfaces
I have a large pyramid shaped mold that I have yet to get a decent part off of. The outside surface of the formed part has a rippled look in some areas. The inside looks textured. The part should be smooth outside and inside.
- Mold is 13.5"x13.5"x5" around the base pyramid walls at 30 deg. to an overall height of 16.5"
- Mold is smooth.
- HDPE 1/8"x24"x24" smooth/smooth
- Preheated to 150 deg. F in drying oven
- Raised to 400 deg. F by heater banks on machine to compensate for exiting temerature drop
- Material is approximately 375 deg. F by the time the mold is introduced
- Pre-stretched to provide uniform wall thickness and coverage of the mold.
- The bubble looks nice and smooth.
- I'm not sure if it is a heat issue, vacuum, material, stretch, etc.
- I've tried many recipes and gone through a lot of time and money only to end up with a pile of scrap.
Any help is much appreciated.
Thanks!
Dave
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