Abstract: This relates to blow molded plastic containers wherein at least the body of such containers is of a laminated constuction including, for example, a barrier layer which in the case of the container receiving carbonated products would be a gas barrier layer. It has been found that delamination does occur and this is now solved by selectively providing the container body with minute vent openings which do not extend entirely through the container body, but into that area where delamination occurs and there is an accumulation of a permeant, such as CO.sub.2. The minute vents may be formed in the exterior wall of the container either by way of piercing pins or by utilizing a laser. In the case of the piercing pins, there are incorporated in the blow mold for blow molding the container from a perform and are generally placed along the parting lines of the blow mold and also in central parts of the wall. The construction and operation of the piercing pins may be provided in several forms.

Abstract: A clamshell type carton bottom having integrally connected thereto a domed top with upper portions of side and front panels of the carton bottom defining seats on which there are seated seat members carried by side and front panels of the top and reversely turned so as to slope upwardly and outwardly while the side and front panels slope downwardly and outwardly. Each side panel of the bottom adjacent the front panel of the bottom is provided with a cut line which defines stop means so as to limit the movement of the top into the bottom when the carton is being closed. Further, the bottom front panel is provided with a locking flap which carries a locking tab which engages over the front seat member of the top to lock the top in place relative to the bottom.