1.Purpose of the line The line is used to continuously make PU-cored sandwich panels with the facing layers of steel or aluminum sheet or PU-cored sandwich panels with one side of color steel and the other side of flexible sheet. The roll forming machine is also able to make panels of different profiles if the roll-forming machine is changed. 3. Constituents of the lineThe line is consisted of two decoilers, two hydraulic clipping machines, two forming machines, two film-covering installations, one PU foaming machine unit, one mobile injector, one pre-heating installation, one double-belt laminator, one set of plastic blocks supporting corrugation skin, one hot-air circulator, one set of side chemical stopper, one automatic cutting machine, roller conveyor, steel platform, powered roller conveyor and auto control etc..