The method of flat products (板材 類) using a short fiber pulp

摘要

Pulp board is manufd. with a staple fiber and pulp. A liquid phenol resin is used as the cohesive agent. Artificial fiber and cotton fiber are mixed in the ratio 1:1. The mixt. is cut and dissolved into 3-4 mm. Particles, which are mixed with the pulp at 1:4 and liquid phenol resin is added. The mixt. is pressed under 10kg/cm2 to contain 30-50 % moisture. It is pressed again under 14kg/cm2 at 150C for 30 min. Alternatively, the dissoved mixt. is mixed with pulp at 2:3 and liquid phenol resin (10 wt%) is added. Gypsum (20 wt%) and methylolchloride (5 wt%) are added to the total mixt. This is then pressed under 5kg/cm2 and dried at 100C for an hour. The board is put into a stainless wire mesh and pressed under 17kg/cm2 at 180C for 30 min.