Convenience opening of containers for liquid products

A method of making an easy opening means for a container comprising the steps of providing wall means for said container, providing an opening means in the wall means, providing closure means having at least a film of thermoplastic material in covering relation to said opening means, adhesively bonding with a peelable adhesive said material of said closure means to a portion of the exterior of the wall means about said opening means to effect leak-proof openable closure and concurrently adhesively bonding another portion of said closure means to another portion of the exterior of the wall means with a non-peelable adhesive to non-removably secure the closure means at said other portion of said wall means, and the steps of providing a heat activatable adhesive for bonding in the area of the opening means, and heating said closure means to activate said heat activatable adhesive means and and to soften said film, pressing the closure means against the wall means to extrude a quantity of the film from between the closure and wall means through the opening means to cause a quantity of the film to form peel-resisting means within the opening means for rigidifying the proximate region of said closure means.

A method of making an easy opening means for a container comprising the steps of providing wall means for said container, providing an opening means in the wall means, providing closure means having at least a film of thermoplastic material in covering relation to said opening means, adhesively bonding with a peelable adhesive said material of said closure means to a portion of the exterior of the wall means about said opening means to effect leak-proof openable closure and concurrently adhesively bonding another portion of said closure means to another portion of the exterior of the wall means with a non-peelable adhesive to non-removably secure the closure means at said other portion to said wall means;

• and
• including the steps of forming said opening means to provide edge means, and applying a predetermined pressure load to said closure means against the wall means to thereby extrude the film through the opening means sufficiently to force the extrudate along said edge means and to thereby effect a thickening of the area of the extrudate adjacent to said edge means without materially thickening the portion of the film centered in the opening means.

A method of sealing an operable pressure-resistant closure over an opening in a container wall member comprising the steps of providing:

• a closure comprising a laminate strip member of metal and thermoplastic material to be positioned in overlying relation to the opening in the wall member, applying a carboxylated polypropylene resin to one of said members,
• heating at least one of said members to an extent to melt the thermoplastic material attendant to applying it to said wall member with said resin located between said members and pressing said strip to extrude an amount of said thermoplastic material into the opening sufficient to form a bead of the thermoplastic material within the opening thicker than the thermoplastic material in alignment with the opening sufficient to resist internal pressure developed in the container.