PP is an environmentally friendly material, non-toxic, white translucent, waxy, good strength, good hardness, heat resistance, corrosion resistance, is one of the PP, the English name of polypropylene abbreviation, refers to polypropylene and propylene polymer; High density, no side chain, high crystalline linear polymer; commonly used in the manufacture of daily necessities, medical equipment, etc., with good electrical properties and high frequency insulation from humidity. After deep processing into a folder, craftsmanship, according to customer needs made of different specifications, different thickness, different functional requirements of the packaging box, folders, etc.