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US 12,691,665 B2Granted
Polypropylene copolymer based linear tear multi-layer film
AssigneeCryovac, Inc.
InventorsAshley Cornell Wynne, Pasquale Campanelli
Life of this patent
Estimating the term…
Abstract
A product packaging that exhibits good linear tear behavior. The product packaging being a multi-layer film having an inner layer made from a blend of ethylene copolymer and polypropylene copolymer. The inner layer of the multi-layer film being a substantial proportion of the thickness of the multi-layer film. The multi-layer film having linear tear behavior even when a force is applied at an angle offset from the tear direction.
Claims20
A packaged product comprising:
- a. a first product;
- b. a multi-layer film shrunk to an outer surface of the first product;
- the multi-layer film comprising:
- a first outer layer having a first thickness;
- a second outer layer having a second thickness;
- and
- an inner layer comprising a blend of between 60-80 wt % polypropylene copolymer and between 20-40 wt % of an ethylene copolymer;
- a first intermediate layer disposed between the first outer layer and the inner layer;
- and
- a second intermediate layer disposed between the second outer layer and the inner layer;
- wherein the inner layer has a thickness that is at least 45% the thickness of the multi-layer film;
- the multi-layer film having at least one tear initiator to initiate tear propagation of the multi-layer film along a tear line;
- the multi-layer film having an Angled Tear Deviation Area when torn in at least one of the machine or transverse directions of not more than 800 mm2, the Angled Tear Deviation Area being calculated from a 13 cm tear with a tear force applied at an angle of 26.6° offset from a desired linear tear path and measured in accordance an Angled Tear Deviation Test.
10 more elements
A multi-layer film comprising
- a. a first outer layer having a first thickness;
- b. a second outer layer having a second thickness;
- and
- c. an inner layer comprising a blend of between 60-80 wt % polypropylene copolymer and between 20-40 wt % of an ethylene copolymer;
- d. a first intermediate layer disposed between the first outer layer and the inner layer;
- and
- e. a second intermediate layer disposed between the second outer layer and the inner layer;
- wherein the inner layer has a thickness that is at least 45% the thickness of the multi-layer film;
- the multi-layer film having an Angled Tear Deviation Area when torn in at least one of the machine or transverse directions of not more than 800 mm2, the Angled Tear Deviation Area being calculated from a 13 cm tear with a tear force applied at an angle of 26.6° offset from a desired linear tear path and measured in accordance an Angled Tear Deviation Test.
6 more elements
A method for packaging a product comprising the steps of:
- a. providing a first product;
- b. wrapping the first product in a multi-layer film;
- the multi-layer film comprising:
- a first outer layer having a first thickness;
- a second outer layer having a second thickness;
- and
- an inner layer comprising a blend of between 60-80 wt % polypropylene copolymer and between 20-40 wt % of an ethylene copolymer;
- a first intermediate layer disposed between the first outer layer and the inner layer;
- and
- a second intermediate layer disposed between the second outer layer and the inner layer;
- wherein the inner layer has a thickness that is at least 45% the thickness of the multi-layer film;
- the multi-layer film having an Angled Tear Deviation Area when torn in at least one of the machine or transverse directions of not more than 800 mm2, the Angled Tear Deviation Area being calculated from a 13 cm tear with a tear force applied at an angle of 26.6° offset from a desired linear tear path and measured in accordance an Angled Tear Deviation Test
- c. sealing the multi-layer film;
- d. shrinking the multi-layer film to cause the multi-layer film to fit taught around the first product.
11 more elements
Dependencies are inferred from the claim text.