- mold 1st contact point marks
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Registered
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Registered
So you are pulling vacumm on the non finish side? I built fridge liner vacumm molds a few years back and we pulled the vacumm on the finish side.
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Member
Male molds will produce flow lines. Some things that will help reduce this tendency is to heat the tool. This reduces the tendency of the material to grab and slide. You can't do much with an epoxy mold which I assume you are using. An aluminum tool would be preferable. A female mold would be preferable.
Another thing you can do is prebellow the sheet from the mold side. As the sheet ballons the mold is moved in. Then vaccum is applied and the plastic is snapped to the mold.
Last thing are you drying your sheet prior to forming? ABS is hydroscopic. A high moisture content will contribute to flow lines.
JohnD
- mold 1st contact point marks
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