Foaming or bulging on the surface of the hot press product

The cause of this phenomenon may be that the content of moisture and volatile matter in the material is too high; the mold temperature is too high or too low; the pressure is insufficient and the holding time is too short; the heating of the material is uneven

Evenly. The solution is to strictly control the volatile content in the material, appropriately adjust the mold temperature, and reasonably control the molding pressure and holding time. Improve the heating device so that the material is heated evenly.