Plastic container closure

A plastic closure for plastic containers, which comprises:

• a lid having top and bottom surfaces and a peripheral rim suitable for attachment to a plastic container to seal said container;
• a liner on the bottom surface of the lid resistant to gas permeation;
• and means for providing a closable opening in the lid and liner comprising a tab attached to at least the lid, a continuous notch on said lid adjacent said tab to permit propagation of an opening in said lid starting from said tab to form a flap portion of said lid defining an opening in the lid, hinge means on said lid terminating the notch and opposed to said tab to permit the flap portion to be rotated from a closed position to an open position and from an open position to a closed position;
• and a continuous notch on said liner adjacent and corresponding to said notch on the lid for permitting the liner to propagate a break forming a broken portion of the liner which corresponds in shape of the flap portion of the lid, said broken portion and said flap portion rotating together when the flap portion is moved to an open position, thereby forming a closable opening in the container closure.