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US 4,889,731 AGranted
Package having peelable film
AssigneeW. R. Grace & Co.-Conn.
InventorAllen C. Williams, Jr.
Life of this patent
Estimating the term…
Abstract
A package for extended storage and in-store display of fresh red meat is disclosed. Preferably the package is made by a vacuum skin packaging process wherein the forming web is a composite peelable film having a peelable oxygen barrier layer and an oxygen permeable skin layer which remains to enclose the product when the peelable film is removed after storing. A means and method for readily initiating the peeling process is provided by a combination of a manual pull tab and selected perforations of the forming web.
Claims9
A package having a peelable film layer comprising:
- (a) a product;
- (b) a support web upon whose upper surface the product rests, said support web having at least one edge;
- (c) a composite film enclosing the product said composite film comprising:
- (1) a skin layer sealed to the support web around the periphery of the product;
- and,
- (2) a peelable layer laminated or coextruded to the skin layer on the outer side of the package;
- the bond strength between the peelable and skin layers being of such strength that the two layers may be manually separated one from the other, said bond strength being less than the seal strength between the skin layer and the support web;
- (d) a header strip sealed to the upper surface of the support web adjacent an edge thereof;
- (e) said composite film being superimposed over said strip but not adhered thereto, both the header strip and composite film terminating at the edge of the support member whereby the composite film is readily separable from the header strip at said edge thereby forming a manually grippable pull tab;
- (f) a series of perforations in the composite film arranged substantially in a line generally parallel to the edge of the header which edge is nearest the product, each perforation extending through the composite film and said line being located immediately adjacent to said header;
- (g) the resistance of the peelable layer to tearing along the line of perforations being greater than that of the skin layer whereby when the pull tab is gripped and lifted the peelable layer will not tear along said line but the skin layer will tear as it remains sealed to the support web while the peelable layer is peeled away.
8 more elements
A package having a peelable film layer comprising:
- (a) a product;
- (b) a semi-rigid support or lower web which is a base of thermoplastic material having a gas barrier coating or layer;
- (c) a forming web which has been formed by a vacuum skin packaging process around the product and sealed to the lower web around the periphery of the product;
- (d) said forming web being formed by coextrusion and comprising:
- (1) a multilayer skin film comprising the surface of the forming web which is sealed to the support web, said skin film being gas pervious;
- (2) a multilayer peelable film, said peelable film having a gas barrier layer;
- (3) the bond strength between the skin film and peelable film being less than the bond strength between the skin film and support web and being weak enough to allow manual peeling of the peelable layer from the skin layer,
- (e) non-stick means disposed along an edge of said support member for preventing sealing of the forming web to the support web in the area of said means whereby the unadhered forming web forms a manual pull tab;
- said non-stick means comprising a header strip with a non-stick surface, and,
- (f) peel initiating means distributed adjacent to and along the length of the non-stick means on the side of said non-stick means opposite said edge, said peel initiating means initiating the rupture of the portion of said skin layer superimposed over the non-stick means from the remainder of the skin film whereby when the pull tab is pulled away from the support web the peeling of the peelable layer from the skin layer is initiated, said peel initiating means comprising a series of perforations that penetrate the forming web.
7 more elements
Dependencies are inferred from the claim text.