摘要 |
PROBLEM TO BE SOLVED: To obtain a molding without stickiness on a surface irrespective of seasons by controlling a temperature of reaction stock solution immediately before supplying the solution into a mold. SOLUTION: First control vales 37, 39 feed reaction stock solutions from tanks 30, 32 toward second control valves 45, 47 through main pipings 36, 38. At this time point, the valves 45, 47 block channels to a mixing head 26, feed all the solutions to heat exchangers 53, 55 through pipings 49, 51, heat exchange and return them to the tanks 30, 32. Accordingly, the solutions flowing through the pipings 36, 38 disposed near the head 26 are temperature regulated to be controlled at a constant temperature immediately before starting reaction injection molding. In such a system, 95 wt.% or more of the solution existing in the system is preferably temperature controlled.
|