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Group: Forum Members
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You are over thinking this. You do not need vacuum for making your mould, vacuum is only going to cause you trouble. If you had a solid pattern then I'd say go for it (albeit still totally unnecessary), but you don't. You will be using temporary flanges, which will not be able to handle the vacuum. If you use fluted signboard, this will crush under vacuum. If you use solid polypropylene sheet or even metal flanges - they are still temporary and will be distorted and pulled away from the position you want them in.
In all scenarios, you have a piece that isn't suited for vacuum at all. It is perfectly possible to make a mould like this without vacuum without any voids what-so-ever. Use the right processes and materials, dont try to shoehorn in a process that doesn't suit what you are working with.
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