Closure cap and a process for making same

Abstract From the Canadian patent

A process is disclosed for making a closure cap for a container from a polypropylene material said, closure cap comprising an end wall and a circumferential side wall. The process involves forming gasket in the closure cap via a melting and a cooling operation by applying in the closure cap an amount of plastisol which is shaped therein into a gasket configuration at an elevated temperature adjusted after the plastisol addition, causing the plastisol shaped into the gasket configuration to melt completely by further energy supply and then cooling same to form the gasket. Starting from an integral combination of the closure cap with a sealing ring which is connected with the closure cap by …