... board extruder 2.Smoothing surface,beautiful appearance,innocuity, mildew-free, no cracking and bend PVC board extruder 1.PVC ... by thermal treatment of three-roller calendar. Then smoothing surface, beautiful appearance, innocuity, mildew-free, no distortion, no cracking and ... bending structure are available under lacquer-free state, thus it is one new style decorating materials ...