Vacuum skin packages with reduced product discoloration and method of making

• US 5,087,462 A
• Filed: 10/12/1989
• Issued: 02/11/1992
• Est. Priority Date: 05/13/1988
• Status: Expired due to Term

• Current Assignee: Cryovac Incorporated (Sealed Air)
• Original Assignee: W R Grace & Company - CONN (Standard Industries Holdings, Inc.)
• Inventors: Bekele, Solomon, Williams, Allen C. Jr.
• Primary Examiner(s): Corbin, Arthur L.
• Application Number:
  US07/420,182
• Time in Patent Office: 852 Days
• Field of Search: 426/127, 426/418, 426/396, 426/129, 53/437, 53/433, 53/434, 206/503
• US Class Current: 426/129
• CPC Class Codes: B65D 81/24 Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with thermal insulation B65D81/38

Abstract

Discoloration of meat products due to oxygen starvation in stacked packages is significantly reduced by applying a textured surface to the bottom of the packages. A discrete textured film may be adhered to a tray or supporting member, or the tray or supporting member may itself be textured at its bottom surface.

Claims

1. A skin package comprising:

a) a gas impervious support member having a top surface and a textured bottom surface, the peaks and valleys of the textured bottom surface having a thickness less than the average thickness of the support member;

b) a meat product held securely to the top surface of the support member; and

c) a film member which holds the product to the support member, said film member including

i) a first portion which conforms to the shape of the product, and

ii) a second portion sealed to the top surface of the support member around the periphery of the product.

2. A method of reducing discoloration of a meat product in a first skin package, when a second skin package of the same type is stacked on top of said first package, the first package having:

a) a gas impervious support member, and

b) a gas impervious film member which holds the product to the support member, comprising creating a textured pattern on the bottom surface of the support member of the second package, such that when the second package is stacked on the first package, the textured surface is in contact with the top of the first package, said textured pattern having an average thickness less than the thickness of the support member.

3. A method of making a skin package useful in reducing discoloration comprising:

a) feeding a gas impervious thermoplastic material toward a loading station, said material having a top surface and a textured bottom surface, the peaks and valleys of the textured bottom surface having a thickness less than the average thickness of the material;

b) loading a meat product onto the top surface of the textured material at the loading station;

c) covering the product and top surface of the textured material with a film member; and

d) sealing the film member to the top surface of the textured material.

4. A method according to claim 3 further comprising between steps a) and b):

i) feeding the material to a thermoforming station;

ii) heating the material to its forming temperature;

iii) drawing the heated material into a mold to form a thermoformed support member; and

iv) moving the support member from the mold to the loading station.

5. A method of making a skin package useful in reducing meat discoloration comprising:

a) feeding a gas impervious thermoplastic material to a thermoforming station, said material having a top surface and a bottom surface;

b) heating the material to its forming temperature;

c) providing a mold with an interior bottom surface having a textured pattern, the peaks and valleys of the textured pattern having an average thickness less than the thickness of the thermoplastic material;

d) drawing the heated material into the mold to form a thermoformed support member with a textured bottom surface;

e) moving the support member from the mold to a loading station;

f) loading a meat product onto the top surface of the support member at the loading station;

g) covering the product and top surface of the support member with a film member; and

h) sealing the film member to the top surface of the support member.

6. A method of making a skin package useful in reducing meat discoloration comprising:

a) feeding a gas impervious thermoplastic material to a thermoforming station, said material having a top surface and a bottom surface;

b) heating the material to its forming temperature;

c) providing a mold having coarse sand paper attached to a bottom plate thereof;

d) drawing the heated material into the mold to form a thermoformed support member with a textured bottom surface;

e) moving the support member from the mold to a loading station;

f) loading a meat product onto the top surface of the support member at the loading station;

g) covering the product and top surface of the support member with a film member; and

h) sealing the film member to the top surface of the support member.