Application: This board production line is able to produce different thickness and width profile according to the raw material performance,matching the various single or double screw extruder.the profile can be used widely in these area such as environmental protection,chemical industry,advertis-ement and anti-spoil. According to the thickness of board and style of three-roller calendar,the production line can be classified vertical three-roller and 45 oblique three-roller.the purpose for that is to fulfil the crafts of produce.