CN101318577B - Thermal contraction sheet film for bone and meat packaging - Google Patents
Thermal contraction sheet film for bone and meat packaging Download PDFInfo
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- CN101318577B CN101318577B CN2008101242680A CN200810124268A CN101318577B CN 101318577 B CN101318577 B CN 101318577B CN 2008101242680 A CN2008101242680 A CN 2008101242680A CN 200810124268 A CN200810124268 A CN 200810124268A CN 101318577 B CN101318577 B CN 101318577B
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Abstract
The invention provides a heat-shrinkable sheet film used for packaging bone-in meat, comprising a surface layer, a sandwich layer and an inner layer; the surface layer contains resin a with a content of 0%-50% and resin b with a content of 50%-100%, the resin a is an ethylene-Alpha-olefin copolymer or the mixture of a variety of ethylene-Alpha-olefin copolymers and the resin b is the copolymer of ethylene and MAA, AA, VA, BA, or EA; the sandwich layer is an EVA resin layer, the percentage by weight of the VA in the EVA resin is 12%-28%, while the density of the EVA resin is 0.93-0.95g/cm<3>;the inner layer contains resin c with a content of 60-100% and resin d with a content of 0-40%, the resin c is the copolymer of ethylene and propylene, butene, hexylene-1 or octylene-1, while the resin d is one of or the mixture of LLDPE, POP, VLDPE, LMDPE or CEO. The heat-shrinkable sheet film has excellent abrasive resistance and penetration resistance and can be extensively applied to the fresh-keeping package of bone-in cold fresh meat.
Description
Technical field
The present invention relates to a kind of thermal contraction slice film of multilayer, relate in particular to a kind of thermal contraction sheet film that is used to bone and meat packaging, belong to plastic product, field of packaging material.
Background technology
Cold fresh meat can adopt heat shrink films to pack.The thickness of shrink film generally is no more than 100 microns, usually less than 76 microns; Meat that Bao film generally can't the strap bone so, rib row is for example vacuumizing or a lot of apertures can appear in the link of thermal contraction on film.The appearance of aperture can make this regional meat be exposed under the environment of oxygen, thereby the shelf-life of product is reduced; In the rocking of meat products, vibrations and handling process, also be easy to generate aperture and gall phenomenon.
To puncture and gall in order to prevent at present, its solution is to twine a sheet film on its surface before cold fresh meat dress shrinks bag.Usually the sheet film thickness is 100 μ m～160 μ m, shrinks bag thickness 76 μ m or lower.Film is thick more, and it is difficult more to stretch, and thick film has good resistance to abrasion, so need take a kind of compromise way to determine the thickness of film.Adopt overstretching raising paracentesis resistance in order to optimize, increase by film thickness improves resistance to abrasion, in US Patent 4,755,403and 5,545, disclosed crosslinked film of a kind of thermal contraction in 419, flattened by a kind of Biaxially stretched multilayered pipe and make, this multilayer pipe has an inside face of being made by EVA with autohension, outside face with a PE--EVA compound composition, wherein PE is LLD (for example DOWLEX 2045), and when pipe was crushed, internal layer was bonded together, become such structure: EVA+LLDPE/EVA/EVA+LLDPE, the about 7MR of radiation dose; 127 microns of sheet films shrink 58 microns in bag.
As seen, design a kind of anti-thermal contraction bag that punctures, prevents worn-off with low cost, be used for the cold fresh meat of strap bone, its practical significance is unusual.
Summary of the invention
The purpose of this invention is to provide a kind of higher rigidity that has, cost is cheaper is used to thermal contraction sheet film with bone and meat packaging, be intended to overcome the defective that is punctured easily or galls when thermal contraction bag is used for the cold fresh meat of strap bone, can be satisfied with is applicable to the fresh-keeping packaging of the cold bright beef and mutton of band bone.
Purpose of the present invention is achieved through the following technical solutions:
Be used to thermal contraction sheet film with bone and meat packaging, comprise top layer, sandwich layer and internal layer, top layer and internal layer are bonding from the both sides and the sandwich layer of sandwich layer respectively, characteristics are: described top layer comprises resin a and resin b, wherein, the weight content scope of resin a is 0%～50%, and the weight content scope of resin b is 50%～100%; The density of described resin a is 0.88～0.917g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Described resin b is the copolymer of ethene and MAA, VA, BA or EA, and wherein carboxylic acid monomer's weight content scope is 5%～15%;
Described sandwich layer is the EVA resin bed, and wherein the weight percentage of the VA of EVA resin is 12%～28%, and density is 0.93～0.95g/cm
3
Described internal layer comprises resin c and resin d, and wherein, the weight content scope of resin c is 60%～100%, and the weight content scope of resin d is 0%～40%; The density of described resin c is 0.89～0.918g/cm
3, be the copolymer of ethene and propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of described resin d is 0.90～0.918g/cm
3, be one or more the compound among LLDPE, POP, VLDPE, LMDPE, the CEO.
Further, the above-mentioned thermal contraction sheet film that is used to bone and meat packaging, the thickness range of described sandwich layer is at 35～50 microns, and the thickness range on described top layer is at 35～50 microns, and the thickness range of described internal layer is at 30～60 microns.
Further, the above-mentioned thermal contraction sheet film that is used to bone and meat packaging, described thermal contraction sheet film combinations becomes to shrink bag, its impact resistance 〉=200N, puncture energy 〉=2J, its peel strength is greater than 50gms/25.4mm.
Substantive distinguishing features and obvious improvement that technical solution of the present invention is outstanding are mainly reflected in:
The present invention is used to the thermal contraction sheet film with bone and meat packaging, overcome the shortcoming that is punctured easily and galls when thermal contraction bag is used for the cold fresh meat of strap bone, be used in combination with multi-layer co-extruded contraction bag, be used for strap kindred class, widened the range of use and the field of thermal contraction bag.Have excellent abrasive and paracentesis resistance, reduced 40% than general-duty sheet film thickness.Both are in conjunction with the fresh-keeping packaging that is used to the cold bright beef and mutton of bone, and the latter two combinations of thermal contraction are tightr, do not occur layering during the subsequent handling operation.Product has constant in length and breadth to shrinkage percentage, can guarantee the stability of packing.Not only attractive in appearance, light, health can also improve the speed of packaging production line, and cost-cutting satisfies when client selects commodity in the modern economy society requirement to packing fully.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the present invention is used to the cross section structure scheme drawing with the thermal contraction sheet film of bone and meat packaging.
The implication of each Reference numeral among the figure:
The A-top layer, B-sandwich layer, C-hot sealing layer.
The specific embodiment
As shown in Figure 1, be used to the thermal contraction sheet film with bone and meat packaging, be three-decker, structure is: A//B//C, i.e. top layer A, sandwich layer B and internal layer C.The thickness range of sandwich layer A is at 35～50 microns, and the thickness range of top layer B is at 35～50 microns, and the thickness range of internal layer C is at 30～60 microns.
Top layer A comprises resin a and resin b, and wherein, the weight content scope of resin a is 0%～50%, and the weight content scope of resin b is 50%～100%; The density of described resin a is 0.88～0.917g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Described resin b is the copolymer of ethene and MAA, VA, BA or EA, and wherein carboxylic acid monomer's weight content scope is 5%～15%.
Sandwich layer B is the EVA resin bed, and wherein the weight percentage of the VA of EVA resin is 12%～28%, and density is 0.93～0.95g/cm
3
Internal layer C comprises resin c and resin d, and wherein, the weight content scope of resin c is 60%～100%, and the weight content scope of resin d is 0%～40%; The density of described resin c is 0.89～0.918g/cm
3, be the copolymer of ethene and propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of described resin d is 0.90～0.918g/cm
3, be one or more the compound among LLDPE, POP, VLDPE, LMDPE, the CEO.
Embodiment 1:
Join each layer raw material earlier, the ethene of the ethylene-propylene copolymer of top layer A:40kg and 60kg-EVA copolymer, the density of ethylene-propylene copolymer is 0.88g/cm
3The EVA resin of sandwich layer B:28kg, density are 0.95g/cm
3The ethylene-propylene copolymer of internal layer C:60kg and the LLDPE of 40kg, the density of ethylene-propylene is 0.89g/cm
3, the density of LLDPE is 0.918g/cm
3
The extruder that each layer raw material is added each layer respectively carries out fusion plastification, enters a multi-layer co-extruded circular die then and carries out the distribution of melt, thereby form the circular melt pipe of a multilayer; Circular melt pipe carries out entering hot rise tank behind the cooling forming through vacuum sizing and is heated to the suitable temperature that propels the price of, and charges into pressurized air and carry out horizontal inflation and longitudinal stretching between two pairs of nip rolls; Carry out rolling after former film after the moulding is heat-treated, carry out radiation treatment then and behind certain dosage, cut into sheet film.
Embodiment 2:
Join each layer raw material earlier, the ethene of the ethene of top layer A:50kg--hexene-1 copolymer and 50kg-EAA copolymer, the density of ethene--hexene-1 copolymer is 0.917g/cm
3The EVA resin of sandwich layer B:12kg, density are 0.93g/cm
3The ethylene-butene copolymer of internal layer C:70kg and the CEO of 30kg, the density of ethene-butylene is 0.91g/cm
3, the density of CEO is 0.90g/cm
3
Other method and structure is identical with the specific embodiment 1.
Embodiment 3:
Join each layer raw material earlier, the ethene of top layer A:100kg-EMAA copolymer.The EVA resin of sandwich layer B:18kg, density are 0.94g/cm
3The ethylene-propylene copolymer of internal layer C:100kg, the density of ethylene-propylene are 0.918g/cm
3Other method and structure is identical with the specific embodiment 1.
The thermal contraction sheet film combinations that adopts technical solution of the present invention to obtain becomes to shrink bag, and after testing, its main performance index sees Table 1.
Table 1
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Impact resistance | 208N | 200N | 211N |
| The puncture energy | 2J | 2.5J | 2J |
| Peel strength | 50gms/25.4mm | 53gms/25.4mm | 52gms/25.4mm |
The invention a kind of thermal contraction sheet film that is used to bone and meat packaging, be used in combination with multi-layer co-extruded contraction bag, be used for strap kindred class.Overcome the shortcoming that is punctured easily or galls when thermal contraction bag is used for the cold fresh meat of strap bone, the range of use and the field of having widened thermal contraction bag.Have excellent abrasive and paracentesis resistance, reduced 40% than general-duty sheet film thickness.Both are in conjunction with being used to fresh-keeping packaging with the cold bright beef and mutton of bone, thermal contraction the latter two in conjunction with tightr, so that layering can not occur during the subsequent handling operation.Product has constant in length and breadth to shrinkage percentage, can guarantee the stability of packing.Not only attractive in appearance, light, health can also improve the speed of packaging production line, and cost-cutting satisfies when client selects commodity in the modern economy society requirement to packing fully.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (2)
1. be used to thermal contraction sheet film with bone and meat packaging, comprise top layer, sandwich layer and internal layer, top layer and internal layer are bonding from the both sides and the sandwich layer of sandwich layer respectively, it is characterized in that: described top layer comprises resin a and resin b, wherein, the weight content scope of resin a is 0%～50%, and the weight content scope of resin b is 50%～100%; The density of described resin a is 0.88～0.917g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Described resin b is the copolymer of ethene and MAA, VA or EA, and wherein carboxylic acid monomer's weight content scope is 5%～15%;
Described sandwich layer is the EVA resin bed, and wherein the weight percentage of the VA of EVA resin is 12%～28%, and density is 0.93～0.95g/cm
3
Described internal layer comprises resin c and resin d, and wherein, the weight content scope of resin c is 60%～100%, and the weight content scope of resin d is 0%～40%; The density of described resin c is 0.89～0.918g/cm
3, be the copolymer of ethene and propylene, butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of described resin d is 0.90～0.918g/cm
3, be one or more the compound among LLDPE, VLDPE, the LMDPE.
2. the thermal contraction sheet film that is used to bone and meat packaging according to claim 1, it is characterized in that: the thickness range of described sandwich layer is 35～50 microns, and the thickness range on described top layer is 35～50 microns, and the thickness range of described internal layer is 30～60 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101242680A CN101318577B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction sheet film for bone and meat packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101242680A CN101318577B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction sheet film for bone and meat packaging |
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| Publication Number | Publication Date |
|---|---|
| CN101318577A CN101318577A (en) | 2008-12-10 |
| CN101318577B true CN101318577B (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101242680A Active CN101318577B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction sheet film for bone and meat packaging |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103874728B (en) | 2011-09-23 | 2016-04-27 | 陶氏环球技术有限责任公司 | Based on the polymer composition of alkene and the goods prepared from it |
| CN108202517A (en) * | 2016-12-19 | 2018-06-26 | Sabic环球技术有限责任公司 | Multilayer film |
| EP3568297A4 (en) | 2016-12-19 | 2020-12-30 | SABIC Global Technologies B.V. | Multi-layer film |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089629A (en) * | 1992-10-30 | 1994-07-20 | 索坦有限公司 | Heat-shrinkable coextruded profiled film and manufacture method thereof |
| US5545419A (en) * | 1994-07-21 | 1996-08-13 | W. R. Grace & Co.-Conn. | Patch bag having supplemental seal |
| CN1136996A (en) * | 1995-01-20 | 1996-12-04 | 大仓工业株式会社 | Heat-shrinkable polyolefin multilayer film |
| CN1190367A (en) * | 1994-12-16 | 1998-08-12 | 格雷斯公司 | Multi-laser heat-shrinkable film |
| CN1767947A (en) * | 2003-04-03 | 2006-05-03 | 三井化学株式会社 | Film for packaging |
-
2008
- 2008-07-07 CN CN2008101242680A patent/CN101318577B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1089629A (en) * | 1992-10-30 | 1994-07-20 | 索坦有限公司 | Heat-shrinkable coextruded profiled film and manufacture method thereof |
| US5545419A (en) * | 1994-07-21 | 1996-08-13 | W. R. Grace & Co.-Conn. | Patch bag having supplemental seal |
| CN1190367A (en) * | 1994-12-16 | 1998-08-12 | 格雷斯公司 | Multi-laser heat-shrinkable film |
| CN1136996A (en) * | 1995-01-20 | 1996-12-04 | 大仓工业株式会社 | Heat-shrinkable polyolefin multilayer film |
| CN1767947A (en) * | 2003-04-03 | 2006-05-03 | 三井化学株式会社 | Film for packaging |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平7-9640A 1995.01.13 |
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| CN101318577A (en) | 2008-12-10 |
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Owner name: SUZHOU TIPACK CO., LTD. Free format text: FORMER NAME: SUZHOU TIANJIA NEW MATERIAL CO., LTD. |
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Address after: 215122, Jiangsu province Suzhou Industrial Park Town, only 59 new road Patentee after: Suzhou Tipack Co., Ltd. Address before: 215122, Jiangsu province Suzhou Industrial Park Town, only 59 new road Patentee before: Suzhou Tianjia New Material Co., Ltd. |