US 5,346,735 AGranted

Peelable barrier film for vacuum skin packages and the like

AssigneeW. R. Grace & Co.-Conn.

InventorsRobin H. Logan, Solomon Bekele, Henry W. Stockley, III, Gloria G. Toney

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Abstract

A vacuum skin package for packaging fresh red meat and like articles is produced by using a composite, multilayer, oxygen barrier, vacuum skin packaging forming film in which the impermeable film can be manually separated from the non-barrier, oxygen permeable film. After the vacuum skin package is formed to enclose a fresh red meat product in a vacuum the meat will have a purplish color. Then, after storage, the impermeable film can be removed so that the remaining permeable film can admit oxygen to impart the desirable red bloom to the fresh meat. The oxygen permeable film preferably includes a core having enhanced permeation properties. The impermeable film preferably includes an EVOH layer sandwiched between ionomer layers for improved barrier properties.

Claims12

Dependent claims

A web for vacuum skin packaging and the like which web is separable into permeable and impermeable films, said web comprising a permeable film and an impermeable film, wherein said permeable film comprises

(a) a sealant layer;
(b) a core layer comprising ethylene copolymer of relatively high gas permeability;
(c) an optical layer comprising a linear ethylene/alpha-olefin copolymer having a density of between about 0.900 and 0.940 gms/cm.sup.3 ;
and said impermeable film comprises
(d) a first EVOH layer immediately adjacent to the optical layer;
(e) a first intermediate layer selected from the group consisting of an ionomer and an ionomer blend, the first intermediate layer being adjacent to the first EVOH layer;
(f) a second EVOH layer adjacent to the first intermediate layer;
(g) a second intermediate layer selected from the group consisting of an ionomer and an ionomer blend, the second intermediate layer being adjacent to the second EVOH layer;
(h) an optional layer comprising a polymer selected from an ionomer, an ethylene vinyl acetate copolymer, and mixtures thereof;
and
(i) an outer or second surface layer of an abuse resistant polymeric material;
said sealant layer of the permeable film being capable of sealing to a polymeric surface with a bond strength greater than the force required to delaminate said impermeable film from said permeable film at said optical layer (c) and said first EVOH layer (d).

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/930,882Filed 14 Aug 1992
Granted: 13 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/306
Comprising vinyl polymers; comprising acrylic polymers: comprising vinyl acetate or vinyl alcohol polymers
B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
B65D 75/305
Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping,…:…