Jin Qiujia section bump drops plate manufacturers, price folk songs supply the same weight convex structure metal plate steel up to 4 times higher than the solid metal plate; strength, bump board more than 70 percent lighter than the solid plate. Attaches great importance to its physical function caused a variety of industry experts, to declare the patent, has been authorized by the national patent offices grant management) intensity distribution of multi-directional greatly superior corrugated unidirectional the convex structure composite sheet transverse compressive, The folding endurance polyploidy in corrugated sheet metal, not easily deformed. B) corrugated core layer out the wood rate of 60% -85%, while the the bump core layer of 100%. C) the core layer single layer can become products, double molding, four may also composite, but not in other structures. D) with a wide range of application characteristics: corrugated, honeycomb application areas and products, concave and convex structure can also be applied. Bump structure can be applied, such as shipbuilding, locomotive casing manufacturing industry and other fields, but not the former two.