High quality 2 rolls Calender machine has good physical and mechanical properties and excellent insulation properties. high quality 2 rolls calender machine What is the proportion standard? high quality 2 rolls calender machine specific gravity standard is between 1.1-1.8g/cm3. high quality 2 rolls calender machine Process and forming: The upper and lower surfaces of the insulation board must not be harmful and irregular. Harmful irregularity refers to one of the following...