Manufacturing melamine impregnated decorative paper requires a series of impregnating processing, and there are many standards to be met that defines final quality. 

Liquid melamine glue container need to keep stable temperature and volume. New liquid will be guided into the container to make sure all paper absorb same weight of glue. The thickness of the glue varies according to different printed paper. The difficult part of impregnating is how to keep air out of the glue application process. 

Also, before impregnating, we need to drive the air out of the paper.