Importance

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Abstract

Methods of making packages having improved resealable interlocking closures from a web of film, the closure having male and female portions formed in line with or transversely to the film flow during package formation. The film is fanfolded to form a stack, the layers of which are heat sealed together. The strip is abraded on one surface to remove the thermoplastic coating, the film then being formed into packages having overlap longitudinal package seals, and in which portions of the strip are apposed. The package ends are sealed and the locking closure is formed in the strip, the female portion formed in the package face that includes the longitudinal package seal. In another embodiment the inner and outer parts of the resealable closure are separately formed. Layering other than by fanfolding to form a stack may be utilized, by heat sealing a strip of heat sealable material to the packaging film, Also optionally formed in the resealable closure are hinges and reinforcing V-notches.

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First Claim