Closure cap with plastic liner

A plastic closure cap for a container having a flat imperforate plastic interior liner, said liner having a mating surface with said cap and said mating surface and said cap being made from plastic materials having at least substantially similar melting temperatures, said cap having a top cap portion and a skirt depending from said top cap portion, said mating surface of said liner being of a corresponding shape and size to said top cap portion and said liner having a peripheral sealing area internal of and adjacent to said cap of said skirt, said cap and said mating surface of said liner being secured at a means defining a break resistant weld formed by melting to one another without penetration through said cap at a location generally centrally of said liner away from said sealing area, such that said means defining a break resistant weld maintains said liner secured to said cap upon removal of said cap from the container.