Disposition of anti-return valve for foam moldes (Machine-translation by Google Translate, not legally binding)

摘要

Non-return valve arrangement for foaming molds and application in molds in which pieces based on foamable synthetic resins are formed, characterized in that it is constituted by a shutter element freely housed in an inner mouth of the inlet duct next to the mold chamber, such that, in the situation of injection of the material to be molded from the feed nozzle, said element is displaced by the material itself. Leaving the passage free, while in the full mold situation, by state of the material, the said sealing element is pushed in the opposite direction by the pressure of the foaming material, being applied against the inlet conduit to determine its sealing and the consequent closing of the molding chamber. (Machine-translation by Google Translate, not legally binding)