IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0029200
(2005-01-04)
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등록번호 |
US-9498936
(2016-11-22)
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발명자
/ 주소 |
- Douglas, Michael J.
- Buelow, Duane H.
- Mueller, Chad D.
- Blemberg, Robert J.
- Castellani, Roberto P.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
149 |
초록
▼
Multilayer structures, methods of making the same and packages made therefrom are provided. The multilayer structures are useful for packaging bone-in meat or other like products. More specifically, the multilayer structures have sufficient rigidity and strength to contain bone-in meat or other like
Multilayer structures, methods of making the same and packages made therefrom are provided. The multilayer structures are useful for packaging bone-in meat or other like products. More specifically, the multilayer structures have sufficient rigidity and strength to contain bone-in meat or other like products, while also maintaining good oxygen barrier properties. In addition, multilayer structures can easily seal to themselves or to other structures. Moreover, the multilayer structures are biaxially oriented and heat-shrinkable.
대표청구항
▼
1. A package comprising a multilayer structure and a bone-in meat product, the multilayer structure comprising: an outer layer comprising polyethylene, wherein the volume percent of the outer layer is between 5% and 25% of the multilayer structure;a first polyamide layer, wherein said first polyamid
1. A package comprising a multilayer structure and a bone-in meat product, the multilayer structure comprising: an outer layer comprising polyethylene, wherein the volume percent of the outer layer is between 5% and 25% of the multilayer structure;a first polyamide layer, wherein said first polyamide layer comprises a blend of between 91% by weight and 99% by weight semi-crystalline polyamide and 1% by weight to 9% by weight amorphous polyamide, wherein the volume percent of the first polyamide layer is between 15% and 25% of the multilayer structure;a first tie layer disposed between and in contact with each of said outer layer and said first polyamide layer, wherein the volume percent of the first tie layer is between 2% and 15% of the multilayer structure;a barrier layer disposed in contact with said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 27 mol % and 42 mol %;a second polyamide layer disposed in contact with said barrier layer, wherein said second polyamide layer comprises a blend of between 91% by weight and 99% by weight semi-crystalline polyamide, and between 1% by weight and 9% by weight amorphous polyamide, wherein the volume percent of the second polyamide layer is between 15% and 25% of the multilayer structure;a sealant layer, wherein the sealant layer comprises polyethylene, wherein the volume percent of the sealant is greater than the volume percent of the outer layer; anda second tie layer disposed between and in contact with each of said sealant layer and said second polyamide layer, wherein the volume percent of the second tie layer is between 2% and 15% of the multilayer structure,wherein the thickness of the multilayer structure is between 1.5 mils and 5 mils,wherein the multilayer structure is biaxially oriented, andthe package comprises a bone-in meat product contained therein, where a bone of the bone-in meat product protrudes from the meat and contacts the multilayer structure,wherein the multilayer structure does not comprise a double wall or patch, is heat-shrinkable, annealed and has rigidity, strength, oxygen barrier and puncture resistance to hold the bone-in meat product. 2. The multilayer structure of claim 1 wherein said first and second polyamide layers each comprise a blend at least 68% by weight of a first semi-crystalline polyamide, at least 23% by weight of a second semi-crystalline polyamide. 3. The multilayer structure of claim 1 wherein said first and said second polyamide layers comprise an equal percent by volume of the multilayer structure. 4. The multilayer structure of claim 1 wherein the outer layer is between 15% by volume and 20% by volume of the multilayer structure and the sealant layer is between 25% by volume and 30% by volume of the multilayer structure. 5. The multilayer structure of claim 1 wherein the outer layer comprises linear low density polyethylene. 6. The multilayer structure of claim 1 wherein the sealant layer comprises linear low density polyethylene. 7. The multilayer structure of claim 1, wherein the outer layer and the sealant layer each comprise linear low density polyethylene. 8. A bone-in meat package comprising: a first wall comprising a multilayer structure comprising an outer layer comprising polyethylene, wherein the volume percent of the outer layer is between 5% and 25% of the multilayer structure;a first polyamide layer, wherein said first polyamide layer comprises a blend of 91% by weight to 99% by weight semi-crystalline polyamide and 1% by weight to 9% by weight amorphous polyamide, wherein the volume percent of the first polyamide layer is between 15% and 25% of the multilayer structure;a first tie layer disposed between and in contact with each of said outer layer and said first polyamide layer, wherein the volume percent of the first tie layer is between 2% and 15% of the multilayer structure;a barrier layer disposed in contact with said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 27 mol % and 42 mol %;a second polyamide layer disposed in contact with said barrier layer, wherein said second polyamide layer comprises a blend of 91% by weight to 99% by weight semi-crystalline polyamide and 1% by weight to 9% by weight amorphous polyamide, wherein the volume percent of the second polyamide layer is between 15% and 25% of the multilayer structure;a sealant layer, wherein said sealant layer comprises polyethylene wherein the volume percent of the sealant layer is greater than the volume percent of the outer layer; anda second tie layer disposed between and in contact with each of said sealant layer and said second polyamide layer, wherein the volume percent of the second tie layer is between 2% and 15% of the multilayer structure;wherein the thickness of the multilayer structure is between 1.5 mils and 5 mils,wherein the multilayer structure is biaxially oriented,wherein the package comprising the multilayer structure comprises bone-in meat placed therein and a bone of the bone-in meat protrudes from the meat and contacts the multilayer structure, and wherein the multilayer structure is heat-shrinkable, annealed and has rigidity, strength, oxygen barrier and structure resistance to hold the bone-in meat and does not comprise a double wall or patch. 9. The package of claim 8 wherein said multilayer structure is heat-shrunk around the bone-in meat. 10. The package of claim 8 wherein said first and second polyamide layers each comprise a blend of at least 68% by weight of a first semi-crystalline polyamide, at least 23% by weight of a second semi-crystalline polyamide. 11. The package of claim 8 wherein said first and second polyamide layers comprise an equal percent by volume of the multilayer structure. 12. The package of claim 8, wherein the multilayer structure is crosslinked within a layer of said multilayer structure by irradiation. 13. The package of claim 8, wherein the outer layer comprises linear low density polyethylene. 14. The package of claim 8, wherein the sealant layer comprises linear low density polyethylene. 15. The package of claim 8, wherein the sealant and the outer layer each comprise linear low density polyethylene. 16. The package of claim 8, wherein the second tie layer comprises polyamide. 17. A method of making a package comprising a multilayer structure and bone-in meat, the method comprising the steps of: coextruding a multilayer structure comprising an outer layer comprising polyethylene wherein the volume percent of the outer layer is between 5% and 25% of the multilayer structure;a first polyamide layer, wherein said first polyamide layer comprises a blend of between 91% by weight and 99% by weight semi-crystalline polyamide and 1% by weight to 9% by weight amorphous polyamide; wherein the volume percent of the first polyamide layer is between 15% and 25% of the multilayer structure;a first tie layer disposed between and in contact with each of said outer layer and said first polyamide layer, wherein the volume percent of the first tie layer is between 2% and 15% of the multilayer structure;a barrier layer disposed in contact with said first polyamide layer wherein said barrier layer comprises ethylene vinyl alcohol copolymer having an ethylene content of between 27 mol % and 42 mol %;a second polyamide layer disposed in contact with said barrier layer, wherein said second polyamide layer comprises a blend of between 91% by weight and 99% by weight semi-crystalline polyamide, and between 1% by weight and 9% by weight amorphous polyamide, wherein the volume percent of the second polyamide layer is between 15% and 25% of the multilayer structure;a sealant layer, comprising polyethylene, wherein the volume percent of the sealant layer is greater than the volume percent of the outer layer; anda second tie layer disposed between and in contact with each of said sealant layer and said second polyamide layer, wherein the volume percent of the second tie layer is between 2% and 15% of the multilayer structure;biaxially orienting said multilayer structure using a tubular process whereby each layer of the multilayer structure is coextruded together as a bubble, cooled, then reheated and oriented in both the longitudinal and transverse directions, and annealing said multilayer structure and then,placing bone-in meat within the package andheat shrinking the package around the bone-in meat, wherein a bone of the bone-in meat protrudes from the meat and contacts the multilayer structure, andwherein the thickness of the multilayer structure is between 1.5 mils and 5 mils, andwherein the multilayer structure has rigidity, strength, oxygen barrier and puncture resistance to hold the bone-in meat and does not comprise a double wall or patch. 18. The method of claim 17 wherein said outer layer is between 15% by volume and 20% by volume of the multilayer structure and the heat sealant layer is between 25% by volume and 30% by volume of the multilayer structure. 19. The method of claim 17 further comprising a step of irradiating said multilayer structure to promote crosslinking between the layers of said multilayer structure, prior to the placing step. 20. The method of claim 17 further comprising the step of moisturizing said multilayer structure by applying water to said multilayer structure, prior to the placing step. 21. The method of claim 17 wherein the tubular process comprises a double bubble process. 22. The method of claim 21, wherein the multilayer structure is oriented in the second bubble of the double bubble process. 23. The method of claim 17, wherein the outer layer comprises linear low density polyethylene. 24. The method of claim 17, wherein the sealant layer comprises linear low density polyethylene. 25. The method of claim 17, wherein the sealant and the outer layer each comprise linear low density polyethylene.
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