... .Continuous Sandwich Panel Line:Wall panel&Roof panel. 2.Core:PU,foam,polyfoam 3.cover:steel&color-steel,aluminum Continuous Sandwich panel production line,PU machine,color-steel facingsThe continuous production line ... layer of anti-combustion polyurethane, polyisocyanurate or phenolic foam plastic. The thickness of the produced sandwich panel ranges from 0 to 10 mm, the ...