xianfa roll forming machine factory
special uesage roofing sheet roll forming machine is for speical kinds of roofing sheet , for example the composite panel forming machine. it is also named sandwich panel production line. it is a large equipment. sandwich panel roll forming machine makes the sandwich panel, which has an insulating effect. and the machine can be divided into eps sandwich panel forming machine and rock wool sandwich roll forming machine, the filler between two steel sheet is different.