| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality, yield, distribution density and uniformity of sprayed urethane stock solution by spraying a hard polyurethane stock solution over a continuously moving face material and performing the foaming and curing process of the stock solution after causing an air current to directly act upon the stock solution. SOLUTION: A steel face material 13 is caused to travel by the lower face transport conveyor 3 of a continuous hard polyurethane foam manufacturing device 1' and then is heated up using a face material preheater 6. Next, an urethane stock solution 11 mixed by an air mixing process is spread from a mixing head 2. Thus the urethane stock solution 11 in which numerous bubbles are dispersed is conveyed spreading over the face material 13. In addition, an air current is caused to act vertically from an air nozzle 7 fixed about 90 mm distant from the surface of the lower face material 13 at a position away in the downstream of the mixing head 2. Consequently, the stock solution 11 is assisted to spread, then the bubbles 15 are broken to bring about such a state 12 that only the uniform bubbles generated by a chemical change are present. Thus the stock solution 11 undergoes the foaming and curing process through a double conveyor 5, and the irregularities-free and uniform quality foam can be manufactured. |
