Vertical twin-sheet vacuum forming method

摘要: A method of twin-sheet vacuum forming plastic articles having the steps clamping two parallel sheets thermoplastic synthetic resin in a vertical orientation to tray and blowing air between thereby creating hollow cavity sheets. The are then heated molding temperature vertically oriented heaters. disposed opposing mold cavities split wherein have contour conforming configuration desired article. negative pressure is applied suction holes provided which draw against each cavity. clamped together form pinch off around perimeter molded part still within tray. Simultaneously, blow pin inserted into injects compressed further presses cavities. allowed cool set point opened. withdrawn from shuttled away where cut tray, position.