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Does the production of polyurethane need film covering?

No need.

Polyurethane needs bonding. After the roller release paper is coated evenly, put the even glue into the oven to dry, and the front master is aligned with the glue edge. It is made of polyurethane leather and other materials, rolled into a roll, pulled out and packaged.

Interlayer means that EVA film and PVB film are sandwiched between things.