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US 3,988,499 AGranted
Storage bag and method for using same
OwnerThomas D. Reynoldsinventor
Life of this patent
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Abstract
A storage bag made of a composite film material of two or more plys of plastic film for use in vacuum packaging fresh perishables, such as fresh cuts of meat. The film composite has a matted finish on the inside surface of its inner layer which causes the film to have a translucent appearance. The areas of the bag which are sealed together during the packaging process become transparent to provide a visual inspection for a proper seal.
Claims1
A composite film comprising:
- a. a first outer layer of transparent nylon film having a thickness between 0.75 mils. and 2 mils., a puncture resistance value of between 750 to 800 lb./in..sup.2, a tear resistance value between 0.75 to 0.85 lbs. and an oxygen transmission rate of less than 1cc/400 in..sup.2 /24 hours;
- b. an intermediate layer of transparent low density polyethylene having a thickness between 0.5 mils. and 1.5 mils.;
- c. said nylon layer and said polyethylene layer bonded to each other by an adhesion promoter to provide a bond strength in the range of 450 to 500 grams per inch of width, said adhesive promoter being a primer coating applied to said nylon film prior to bonding said nylon film to said polyethylene, and,
- d. a second outer layer of heat sealable, ionomer film, bonded to said polyethylene layer, which is an ethylene-acrylic acid copolymer partially neutralized with sodium or zinc, said ionomer film having an external matte finished surface which is translucent, formed by contacting said ionomer film with a chill roll, said ionomer film having a heat sealing temperature of 200.degree.-230.degree. F. and a seal strength between 10 to 14 lbs./in. of width.
1 more element
Dependencies are inferred from the claim text.