Rotating vacuum frame, often used by screen printers.
Having a vacuum frame makes things easy, but it is not a necessity. Exposure units often come with a vacuum frame, they are very useful, certainly for the bigger format polymer plates. But there are other, and cheaper solutions.
Exposure unit with vacuum frame.
Small polymer plates can be exposed, fixed between two glass sheets using clamps.
Or you can use a board, foam backing and a heavy glass sheet.
you can use a contact printing frame.
There a several diy projects out there to make your own vacuum frame. Here are a few:
https://www.youtube.com/watch?v=V22KWUwIn5A
https://www.flickr.com/photos/48428440@N04/sets/72157623645144972/
https://www.youtube.com/watch?v=8WJn5YFANxU
The one thing you should accomplish is a very good contact between your positive film and the polymer plate. Otherwise, you will lose the fine detail, and sharp contours.
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