The device features focus on domestic industries, and the X i'an Research and Design Institute of the common wall materi als developed from. A unique means of production to the curr ent domestic first-class partition board equipment, have bee n declared national patents. Utility model patents (Patent N o.: 01249886.6) 1, random, under-line, increasing sheet strength. 2, the key breakthroughs hard materials cards, blocking, des troying aircraft phenomenon.