A framing shop should be able to help you out.
Many framing shops use a vacuum style press to dry mount onto a lightweight foam backing board. In the past, I have had wrinkled/folded items that were smoothed out in this way. The only drawback is that your item is now permanently glued to the backing board.
I'd ask them anyway, as they probably have other (non-adhesive) ways to do it as well.
If you want to do it yourself, I suppose large flat sheets of glass or plywood or something like that.
Rob
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