Method and apparatus for vacuum foaming of panels

摘要: A method and apparatus for vacuum foaming of insulating panels. panel supporting plate (16, 17), which is movable between the platens (11, 12) of a press (10), comprises a peripheral frame (23 - 26) and intermediate cross members (27) to divide the 17) into plurality adjacent foaming air-suction zones (28, 29) connectable to a source (18). The air suction (29) communicate with adjacent (28) through narrow passages (30) in intermediate frame (27), near upper surface the panel. double closure system comprising slidable plug (39) on injection sleeve (38) mixing device (38') feeding foamable mixture, a sliding valve (45) at each hole (37) the peripheral (23-26), allows selective vacuum feeding mixture (56), avoiding pressure drops.