Peelable adhesive-based package seal and method of making same
AssigneeOscar Mayer Foods Corporation
InventorsDaniel R. Feldmeier, Michael McCann
Life of this patent
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Abstract
A process for forming an adhesive-based peelable, hermetic seal for a package in which the adhesive ruptures uniformly when the package is opened. A first polyacrylonitrile packaging film has a surface thereof treated with a corona discharge. An adhesive is applied to either the treated film or an opposing second packaging film and the first and second films are brought into contact. The corona discharge treatment of the polyacrylonitrile film reduces the bond strength between the adhesive and the treated film such that the adhesive peels cleanly and uniformly away from the seal area of the treated film, without "stringing".
Claims26
A method of making an adhesive-based hermetic, peelable seal for a food product package, in which the peelable seal uniformly ruptures when the package is opened, without the adhesive stringing comprising the steps of:
- providing first and second package panels, at least one of said package panels being a polyacrylonitrile film;
- subjecting a surface of one of said first and second package panels which is a polyacrylonitrile film to a corona discharge to increase the surface tension thereof and reduce the adhesion characteristics thereof between said one polyacrylonitrile film panel and a peelable adhesive subsequently applied thereto;
- applying said peelable adhesive to one of said first and second package panels in a predesignated peelable seal area;
- and
- adhering said first and second package panels to each other, such that when said package is opened by separating the panels, said adhesive peels away from the package panel that had undergone said subjecting step without stringing of the adhesive applied during said applying step, and substantially all of said adhesive remains substantially adhered to the panel that had not undergone said subjecting step.
A method of manufacturing a package for a food product from two opposing packaging films, the package having an adhesive-based peelable seal, the method comprising the steps of:
- providing two polyacrylonitrile package films;
- subjecting only one of the two package films to a corona discharge treatment to increase the surface tension of at least one surface thereof to between approximately 50 dynes per centimeter and approximately 60 dynes per centimeter;
- applying an adhesive to one of said two packaging films along a predesignated seal area thereon;
- placing a product on one of said two packaging films within an area bounded by said predesignated seal area;
- contacting said two package films together at said predesignated seal area to form a hermetic, peelable seal, such that when said package is opened, said adhesive peels away, without stringing, from said package film subjected to the corona discharge treatment, and said adhesive further remains substantially adhered to an opposing package film which had not been subjected to the corona discharge treatment,
A hermetically peelable sealed structure enclosing a product, the structure being formed from a first packaging film and a second packaging film, each packaging film having a sealing surface, the first packaging film being a polyacrylonitrile film, the sealing surface of said first packaging film having been subjected to a corona discharge to increase the surface tension thereof, an adhesive layer disposed between the respective sealing interfaces of said first and second packaging films, the bond strength of said adhesive layer between said first and second packaging films being substantially reduced by virtue of said corona discharge treatment of aid first packaging film, such that, when said sealed structure is opened, said adhesive layer uniformly peels away from said first packaging film treated surface, without stringing, while remaining substantially adhered to said second packaging film sealing surface.
A package enclosing a food product between opposing first and second package panels, the first package panel including a polyacrylonitrile film which has been treated with a corona discharge treatment at an intensity level of between approximately 2 watts per square foot per minute and approximately 8 watts per square foot per minute to thereby increase the surface tension of a sealing surface of said first package panel to between approximately 50 and 60 dynes per centimeter, hot melt adhesive means disposed between and in adhesive contact with said first package panel sealing surface and an opposing sealing surface of said second package panel, such that the corona discharge treatment reduces bond strength between said adhesive means and said first package panel sealing surface such that said adhesive means ruptures uniformly, without stringing, and when said package is opened said adhesive means remains on said second package panel sealing surface.
Dependencies are inferred from the claim text.