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Cap with an induction seal closure
| Details |
Inventors: Peeters, Dirk;
Assignee: Agfa-Gevaert N. V. (Mortsel, BE)
Primary Examiner: Moy; Joseph Man-Fu
Assistant Examiner:
Attorney, Agent or Firm: Daniel; William J.
A cap with an induction seal closure for sealing the pouring opening of a container, the induction seal closure comprising a polymer sealing layer (27) capable of being heat-sealed to the top surface of the pouring opening of the container, an aluminum foil (22) for heat-sealing said sealing layer by inductive heating of the aluminum, a first releasing layer (25) between said aluminum foil and said sealing layer and a second releasing layer (21) between said aluminum foil and the top wall of said cap, the releasing power of said second releasing layer (21) being greater than that of said first one (25) so that upon removal of the cap from a sealed container the aluminum foil (22) remains adherant to the sealed container instead of to the cap while yet being easily peelable from the container as a consequence of the presence of said first releasing layer (25). |
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DETAILED DESCRIPTION OBJECTS OF THE INVENTION It is an object of the present invention to provide a cap with an improved induction seal closure for sealing the pouring opening of a container, which offers the opportunity for easy separation of the aluminium foil from the container as well as from the cap so that recycling of both of these components is free of problems.
The invention aims in particular at plastic containers with plastic caps which, when empty and reclosed, can be entirely recycled.
STATEMENT OF THE INVENTION A cap with an induction seal closure for sealing the pouring opening of a container, the induction seal closure comprising a polymer sealing layer capable of being heat-sealed to the top surface of the pouring opening of the container, an aluminium foil for heat-sealing said sealing layer by inductive heating of the aluminium, a first releasing layer between said aluminium foil and said sealing layer and a second releasing layer between said aluminium foil and the inner surface of the top wall of said cap, the releasing power of the second releasing layer being greater than that of the first one so that upon removal of the cap from a sealed container the aluminium foil remains adherant to the sealed container instead of to the cap while yet being easily peelable from the container as a consequence of the presence of the first releasing layer.
The term "releasing layer" as used in the present specification stands for an adhesive layer with limited adhesive power and which is in fact intended to enable an easy separation of two layers held together thereby, without or without substantial destruction of such layers.
The term "adhesive" means the broad range of bonding agents that include synthetic resins as well as glues.
The peeling of the aluminium foil from the sealed container is preferably done by hand, and the aluminium foil is then preferably discarded in a receptacle separate from common waste-paper baskets and the like.
The term "container" as used in the present specification encompasses in particular plastic bottles, cans, or jerricans for holding a liquid- or powder-like product, but said term does not exclude glass or other recipients that lend themselves to recycling
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Manufacturing Materials 
