Abstract: A plastic lid for closing a container neck opening according to one embodiment of the present invention comprises a lid body surrounded by an annular rim, the annular rim defining a gasket channel having an open portion at one end opening toward the container neck opening and including a closed base at an opposite end. The annular rim defines a pair of raised annular beads positioned adjacent the open portion of the channel for capturing a gasket received within the gasket channel. The corresponding gasket may be either a preformed gasket that is inserted into the channel or a foamed-in-place gasket that is formed in the gasket channel. No pretreatment of the lid is required for the installed gasket to be retained in the gasket channel.

Abstract: The fabrication of an injection-molded plastic part using a blow-mold resin includes a first step of modifying an injection-molding machine by enlarging resin passages in order for that machine to accept a more viscous resin. The next step in the fabrication process is to provide a mass of blow-molded resin heated to a viscosity suitable for the modified injection-molding machine. A third step is to introduce the mass of blow-molded resin into the modified injection-molding machine. The fourth step is operating the modified injection-molding machine in a manner consistent with the normal operation for injection-molding of the desired plastic part. A part of the present invention is the specific method of modifying component parts of the injection-molding machine so that those component parts are compatible with a more viscous plastic resin.