Composite strip of lids for peel-open thermoplastic receptacles

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 15/08 (2006.01) B32B 7/06 (2006.01)

Patent

CA 2179840

The present invention relates to a composite strip for manufacturing lids for peel-open flat-rimmed thermoplastic receptacles of the type comprising an outer film of aluminum or equivalent material, an inner film of thermoplastic material suitable for adhering to the rim of the receptacle by heat-sealing, and an intermediate bonding layer disposed between the outer film and the inner film. The inner film has a score line in the location of each lid so as to form an opening when the outer layer is peeled off. The intermediate layer is non-uniform, including first zones constituted by a first substance that is sensitive to heat and that has high of affinity for the thermoplastic film under the effect of hot calendaring. The major portion of the intermediate layer is constituted by a substance that resists heat and that has medium affinity for the thermoplastic film, thereby making peeling possible.

La présente invention a trait à une bande de composite pour les couvercles de contenants thermoplastiques à ouverture pelable du type doté d'une pellicule externe d'aluminium ou de matériau équivalent, d'une pellicule interne thermoplastique adéquate pour adhérer au rebord du contenant par thermoscellage, et d'une couche agglomérante intermédiaire disposée entre les pellicules externe et interne. La pellicule interne a une ligne de refoulage à l'endroit de chaque couvercle de façon à former une ouverture lorsque la couche est pelée. La couche intermédiaire n'est pas uniforme, y compris les premières zones constituées par une première substance thermosensible ayant une haute affinité avec la pellicule thermoplastique sous l'effet de la chaleur. La majeure partie de la couche intermédiaire est constituée d'une substance thermorésistante qui a une affinité moyenne avec la pellicule thermoplastique; elle peut donc être pelée.

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