Hollow plate (also called hollow partition board, Wantong board, corrugated board, double wall panels) is the English name ppplatesheet, is a lightweight (hollow structure), non-toxic, pollution-free, waterproof, shockproof, anti-aging, corrosion resistant, rich color of new materials, compared to the cardboard structure products, hollow plate has moisture-proof, corrosion resistance and other advantages. Hollow plates can be processed and formed: handicrafts, special-shaped hollow plates, turnover boxes, turnover knife cards, etc.