RELIEF VALVE FOR PACKING CONTAINER AND MANUFACTURE OF THE SAME

摘要

PURPOSE: To manufacture overpressure valves for packaging containers at an economically cheap cost. CONSTITUTION: For this purpose, the overpressure valves 10 have an adhesive layer 11 on the lower surface and adhesive-repelling layer on the upper surface in order to prevent individual layers of wound rolls from mutually sticking together. The overpressure valves 10 have been connected to one another in one piece and in a row, and are separated consecutivel in a packaging machine.