| 摘要 |
PURPOSE:To provide a manufacturing method for a synthetic resin foamed body capable of making a pouring quantity of a gaseous foaming agent into an extruder constant at all times, and obtain a high foaming degree stably. CONSTITUTION:The manufacture is featured in such that an pouring nozzle diameter is set so that a ratio between the outlet side pressure of a pouring nozzle 6 for pouring a gaseous foaming agent into an extruder 1 and the inlet side pressure of the pouring nozzle 6 becomes a critical pressure ratio or below, and control is effected by a pressure control valve 12 in order that the inlet side pressure becomes constant, and further a temperature from the pressure control valve 12 to the pouring nozzle 6 is controlled constant. |
