Abstract: The present invention is directed to a lug cap or closure that is used in combination with a container for indicating that the container has been opened so as to indicate loss of seal or tampering. The lug cap includes an upper cap portion and a depending tamper or pilfer band, each having a series of circumferentially spaced lugs. The upper cap portion and the pilfer band are joined by a plurality of frangible bridges. The container finish includes combination camming/locking projections for locking the lugs into a locked position and for separating the pilfer band from the upper cap portion by a camming action when the container is opened. The lug cap may also include a secondary tamper indicating means such as a tamper indicating button in the top of the lug cap.

Abstract: A method for producing a foamed plastic product suitable as liner material for container closures, including the steps of extruding a polymer composition foamable at atmospheric pressure into an air space at atmospheric pressure and then into a liquid quenching agent for stopping foaming and for setting, wiping against the quenched composition, and maintaining the residence time of the composition in the air space as a function of bubbling from the composition during the wiping.Also a container closure having a gas impermeable shell and a polyvinyl chloride foam liner of a density of 0.67 to 0.72 grams per cubic centimeter in the shell.