CN102407969A - Heat-shrinkable bag for packaging marine product - Google Patents
Heat-shrinkable bag for packaging marine product Download PDFInfo
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- CN102407969A CN102407969A CN2011102060499A CN201110206049A CN102407969A CN 102407969 A CN102407969 A CN 102407969A CN 2011102060499 A CN2011102060499 A CN 2011102060499A CN 201110206049 A CN201110206049 A CN 201110206049A CN 102407969 A CN102407969 A CN 102407969A
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Abstract
The utility model relates to a heat-shrinkable bag for packaging a marine product, which comprises a surface layer, a core layer and a heat sealing layer, wherein the surface layer and the heat sealing layer are respectively boned with the core layer through bonding layers. The heat-shrinkable bag for packaging the marine product is characterized in that the core layer is made of mixtures consisting of 98 percent of polyvinyl dichloride (PVDC) resin and 2 percent of processing adjuvant by weight, the PVDC resin consists of vinylidene dichloride-methyl acrylate (VDC-MA) copolymers, and the processing adjuvant consists of epoxidized soybean oil or other plasticizer systems; the surface layer is made of resin a and resin b, the resin a consists of ethylene-alpha olefin copolymers or mixtures formed by kinds of ethylene-alpha olefin copolymers, and the resin b consists of ethylene-vinyl acetate copolymers; and the heat sealing layer is made of resin e, resin c and resin d, the resin e consists of ethylene-alpha olefin copolymers or mixtures formed by kinds of ethylene-alpha olefin copolymers, the resin c consists of one or mixtures of linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE) and linear medium density polyethylene (LMDPE), and the resin d consists of processing adjuvant using polyolefin as a carrier. The heat-shrinkable bag has excellent heat sealing performance and excellent anti-piercing performance, and is very suitable for the preservative and shrinking packaging of marine products, especially tunas.
Description
Technical field
The present invention relates to a kind of heat shrink films, relate in particular to a kind of thermal contraction bag that is used for the marine product packing, belong to plastic product, field of packaging material.
Background technology
With the film of polyamide, the nature shrinkage phenomenon is arranged at normal temperatures as main production of resins; With the polyvinylidene chloride resin is the shrink film of primary raw material processing, and difficulty of processing is big, equipment investment is big, the shortcoming of environmental pollution is arranged.Like " multilayer film casing of stretching and preparation method thereof " of Japanese Kureha Kagaku Kogyo K.K., publication number is CNI 252348A; " multilayer heat shrinkable film " of U.S. Cryovac, Inc., publication number are CNI 1 90367A; " heat-shrinkable multilayered film " of Japan Kureha Kagaku Kogyo K.K., publication number is CNI 365886A; " multilayer heat shrinkable film " of Greece Sporos SA, publication number are CN1411409A, all are with the flat heat shrink films of being furnished with radiation and thermosetting device that blows water-cooled, double bubble process production of forcing down; These products play very big effect on present application market; But the heat shrink temperature of these heat shrink films is mostly between 80～95 ℃, because fresh meat Package can only be used this type heat shrink films at present, if packaged for processing is tactless; Make the too high or thermal contraction overlong time of temperature; Tend to cause fresh meat surface to be scalded, destroyed the aesthetic property of fresh meat appearance, shortened the freshness date of fresh meat in the packing material.
The basic structure of multilayer heat shrinkable film is sandwich layer/hot sealing layer/top layer, and sandwich layer is a gas barrier material, such as PVDC or EVOH; Hot sealing layer is polyolefinic heat-sealable material, such as LDPE, LLDPE, VLDPE, ULDE, SURLYN, EVA etc.; The material that the top layer is resistance to abrasion, smooth property, processability is good adopts metallocene PE as uppermost layer usually.The packaging bag of adopting above-mentioned material to make can't be satisfied the environment operating needs well.For example adopt LDPE to do heat-sealable material, its heat seal strength is all not enough with the sticking intensity of heat when running into pollution.Select for use LLDPE to do heat-sealable material, its low-temperature heat-sealing property is relatively poor.Select for use EVA as heat-sealable material, its heat seal strength is not enough.Under this background, metallocene LLDPE and metallocene VLDPE are used to heat-sealable material, but have exposed following problem: add and extrude torque man-hour and reach pressure more greatly and raise; Output can't improve; Also can occur melting the body fragmentation, cause heat sealability to descend, heat seal line is imperfect; Diaphaneity is not high, and its outward appearance is bad.
Most in the market tuna packing all adopts multi-layer co-extruded nylon to shrink bag; It is more crisp at low temperatures to shrink bag on the one hand; Cause low temperature circulation and when depositing broken bag rate higher; Along with the prolongation of time,, directly cause the edibility of product and mouthfeel to descend on the other hand because the color of the relatively poor tuna of barrier can change.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; A kind of multi-layer co-extruded thermal contraction bag that is used for the marine product packing is provided; Be intended to effectively overcome that existing multi-layer co-extruded nylon thermal contraction bag shrinkage percentage is low, convergent force big, barrier is poor, technological deficiency such as more crisp under the low temperature, satisfy the operating needs of seafood freshing shrink wrapping preferably.
The object of the invention is realized through following technical scheme:
The thermal contraction bag that is used for the marine product packing; Comprise top layer, sandwich layer and hot sealing layer; Top layer and hot sealing layer are bonding from the both sides and the sandwich layer of sandwich layer through bonding coat respectively; Characteristics are: the compound that described sandwich layer is made up of the processing aid of PVDC resin that comprises 98Wt % and 2 Wt %, said PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Said processing aid is epoxidized soybean oil or other plasticiser system; The thickness range of said sandwich layer is 5～8 microns;
Said top layer comprises resin a and resin b, and wherein, the weight content scope of resin a is 20%～50%, and the weight content scope of resin b is 50%～80%; The density of said resin a is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Said resin b is an ethylene-vinyl acetate copolymer, and wherein carboxylic acid monomer's weight content is 5%～20%; The thickness range on said top layer is 8～10 microns;
Said hot sealing layer comprises resin e, resin c and resin d, and wherein, the weight content scope of resin e is 60%～90%, and the weight content scope of resin c is 9%～38%, and the weight content scope of resin d is 1%～2%; The density of said resin e is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of said resin c is 0.90～0.918 g/cm
3, be one or more the compound among LLDPE, VLDPE, the LMDPE; Said resin d polyolefin is the processing aid of carrier; The thickness range of said hot sealing layer is 20～25 microns;
Said bonding coat comprises EVA or maleic anhydride modified ethene polymers, and when comprising EVA, the weight percentage of the VA of EVA resin is 10%～28%, and density is 0.93～0.95 g/cm
3
Further, the above-mentioned thermal contraction bag that is used for the marine product packing, wherein, the thickness in monolayer scope of said bonding coat is 5～10 microns.
Substantive distinguishing features and obvious improvement that technical scheme of the present invention is outstanding are mainly reflected in:
The present invention provides a kind of thermal contraction bag that is used for the marine product packing; Overcome that the multi-layer co-extruded thermal contraction bag shrinkage percentage of present polyamide is low, convergent force is big, barrier is poor, shortcoming such as more crisp under the low temperature; Have a lot of particular performances; Such as having suitable oxygen and water vapor barrier, excellent heat sealability: good antipollution heat sealability, stable heat seal strength, wide heat-sealing scope, low-temperature heat-sealing and resistance to effect of heat; Optical property preferably: diaphaneity is better; Desirable strength under shock: especially, paracentesis resistance, low temperature resistance, low volatility, adhesion-resistant slippery property and bag property are suitable for the fresh-keeping shrink wrapping of marine product very much.
Description of drawings
Below in conjunction with accompanying drawing technical scheme of the present invention is described further:
Fig. 1: the present invention is used for the cross section structure scheme drawing of the thermal contraction bag of marine product packing.
The specific embodiment
As shown in Figure 1, be used for the thermal contraction bag that marine product is packed, be five-layer structure, structure is: A//D//B//E//C.Comprise top layer A, sandwich layer B and hot sealing layer C, top layer A is bonding through bonding coat D and sandwich layer C, and hot sealing layer C is bonding through bonding coat E and sandwich layer B.The thickness range of sandwich layer B is at 5～8 microns; The thickness range of top layer A is at 8～10 microns; The thickness range of hot sealing layer C is at 20～25 microns; The thickness range of bonding coat D and bonding coat E is at 5～10 microns.
The compound that sandwich layer B is made up of the processing aid of PVDC resin that comprises 98Wt % and 2 Wt %, said PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Said processing aid is epoxidized soybean oil or other plasticiser system;
Top layer A comprises resin a and resin b, and wherein, the weight content scope of resin a is 20%～50%, and the weight content scope of resin b is 50%～80%; The density of said resin a is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Said resin b is an ethylene-vinyl acetate copolymer, and wherein carboxylic acid monomer's weight content is 5%～20%;
Hot sealing layer C comprises resin e, resin c and resin d, and wherein, the weight content scope of resin e is 60%～90%, and the weight content scope of resin c is 9%～38%, and the weight content scope of resin d is 1%～2%; The density of said resin e is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of said resin c is 0.90～0.918 g/cm
3, be one or more the compound among LLDPE, VLDPE, the LMDPE; Said resin d polyolefin is the processing aid of carrier;
Bonding coat D and bonding coat E comprise EVA or maleic anhydride modified ethene polymers, and when comprising EVA, the weight percentage of the VA of EVA resin is 10%～28%, and density is 0.93～0.95 g/cm
3
Embodiment 1:
Join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:49kg and the epoxidized soybean oil of 1kg.The ethylene-vinyl acetate copolymer of the ethylene-octene of top layer A:40kg-1 copolymer and 60kg, the density of ethylene-octene-1 copolymer is 0.90g/cm
3, the density of ethylene-vinyl acetate copolymer is 0.935 g/cm
3The LLDPE of the ethylene-octene of hot sealing layer C:70kg-1 copolymer and 29kg, the density of ethylene-octene-1 is 0.89g/cm
3, the density of LLDPE is 0.917g/cm
3, the 1kg processing aid; The EVA of bonding coat D and bonding coat E:12kg, density is 0.935g/cm
3
The extruder that each layer raw material is added each layer respectively carries out fusion plastification, thereby gets into the circular melt pipe that distribution that a multi-layer co-extruded circular die carries out melt forms a multilayer then; The entering hot rise tank was heated to the suitable temperature that propels the price of after circular melt pipe carried out cooling forming through vacuum sizing, between two pairs of nip rolls, charged into pressurized air and carried out horizontal inflation and longitudinal stretching; Carry out rolling after former film after the moulding is heat-treated, carry out radiation treatment then and behind certain dosage, carry out bag.
Embodiment 2:
Join each layer raw material earlier, join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:49kg and the epoxidized soybean oil of 1kg.The ethylene-vinyl acetate copolymer of ethene-hexene of top layer A:40kg-1 copolymer and 60kg, the density of ethene-hexene-1 copolymer is 0.91g/cm
3, the density of ethylene-vinyl acetate copolymer is 0.935 g/cm
3The LLDPE of ethene-hexene of hot sealing layer C:70kg-1 copolymer and 29kg, the density of ethene-hexene-1 is 0.91g/cm
3, the density of LLDPE is 0.917g/cm
3, the 1kg processing aid; The EVA of bonding coat D and bonding coat E:12kg, density is 0.935g/cm
3
Other method and structure is identical with embodiment 1.
Embodiment 3:
Join each layer raw material earlier, join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:49kg and the epoxidized soybean oil of 1kg.The ethylene-vinyl acetate copolymer of the ethylene-octene of top layer A:40kg-1 copolymer and 60kg, the density of ethylene-octene-1 copolymer is 0.90g/cm
3, the density of ethylene-vinyl acetate copolymer is 0.935 g/cm
3The VLDPE of the ethylene-octene of hot sealing layer C:70kg-1 copolymer and 29kg, the density of ethylene-octene-1 is 0.89g/cm
3, the density of VLDPE is 0.905g/cm
3, the 1kg processing aid; The EVA of bonding coat D and bonding coat E:12kg, density is 0.935g/cm
3
Other method and structure is identical with embodiment 1.
After testing, the thermal contraction bag that is used for the marine product packing that adopts technical scheme of the present invention to obtain, its main performance index sees Table 1.
Table 1
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| In length and breadth to pulling strengrth | 52MPa | 54 MPa | 53 MPa |
| Punctured resistance | 10.9N/15mm | 12.2N/15mm | 10.5N/15mm |
| In length and breadth to breaking elongation | 113% | 110% | 110% |
| Sealing-strength | 15.2N/15mm | 15.8N/15mm | 14.5N/15mm |
The present invention provides a kind of thermal contraction bag that is used for the marine product packing; Overcome that the multi-layer co-extruded thermal contraction bag shrinkage percentage of general polyamide is low, convergent force is big, barrier is poor, shortcoming such as more crisp under the low temperature; Have a lot of particular performances; Such as having suitable oxygen and water vapor barrier, excellent heat sealability: good antipollution heat sealability, stable heat seal strength, wide heat-sealing scope, low-temperature heat-sealing and resistance to effect of heat; Optical property preferably: diaphaneity is better; Desirable strength under shock: paracentesis resistance, low temperature resistance, low volatility, adhesion-resistant slippery property and bag property are suitable for the fresh-keeping shrink wrapping of marine product very much.
What need understand is: the above only is a preferred implementation of the present invention; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (2)
1. the thermal contraction bag that is used for the marine product packing; Comprise top layer, sandwich layer and hot sealing layer; Top layer and hot sealing layer are bonding from the both sides and the sandwich layer of sandwich layer through bonding coat respectively; It is characterized in that: the compound that described sandwich layer is made up of the processing aid of PVDC resin that comprises 98Wt % and 2 Wt %, said PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Said processing aid is epoxidized soybean oil or other plasticiser system; The thickness range of said sandwich layer is 5～8 microns;
Said top layer comprises resin a and resin b, and wherein, the weight content scope of resin a is 20%～50%, and the weight content scope of resin b is 50%～80%; The density of said resin a is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; Said resin b is an ethylene-vinyl acetate copolymer, and wherein carboxylic acid monomer's weight content is 5%～20%; The thickness range on said top layer is 8～10 microns;
Said hot sealing layer comprises resin e, resin c and resin d, and wherein, the weight content scope of resin e is 60%～90%, and the weight content scope of resin c is 9%～38%, and the weight content scope of resin d is 1%～2%; The density of said resin e is 0.88～0.910 g/cm
3, be the compound of ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, alhpa olefin is butylene, hexene-1 or octene-1, the alhpa olefin weight content is 1%～20%; The density of said resin c is 0.90～0.918 g/cm
3, be one or more the compound among LLDPE, VLDPE, the LMDPE; Said resin d polyolefin is the processing aid of carrier; The thickness range of said hot sealing layer is 20～25 microns;
Said bonding coat comprises EVA or maleic anhydride modified ethene polymers, and when comprising EVA, the weight percentage of the VA of EVA resin is 10%～28%, and density is 0.93～0.95 g/cm
3
2. the thermal contraction bag that is used for the marine product packing according to claim 1, it is characterized in that: the thickness in monolayer scope of said bonding coat is 5～10 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102060499A CN102407969A (en) | 2011-07-22 | 2011-07-22 | Heat-shrinkable bag for packaging marine product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102060499A CN102407969A (en) | 2011-07-22 | 2011-07-22 | Heat-shrinkable bag for packaging marine product |
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| CN102407969A true CN102407969A (en) | 2012-04-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102963092A (en) * | 2012-12-10 | 2013-03-13 | 张建岭 | Multi-layer coextrusion flakiness casing film |
| CN110757781A (en) * | 2019-10-30 | 2020-02-07 | 江阴升辉包装材料有限公司 | Production method of high-transparency non-sticky film for packaging glutinous rice cakes |
| CN112261878A (en) * | 2017-12-15 | 2021-01-22 | 日本水产株式会社 | Fresh tuna meat pack, method for producing fresh tuna meat pack, method for suppressing discoloration of fresh tuna meat pieces, and method for providing fresh tuna meat pieces |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306593A (en) * | 2008-07-07 | 2008-11-19 | 苏州天加新材料有限公司 | Multilayer coextruding pyrocondensation film |
| CN101306744A (en) * | 2008-07-07 | 2008-11-19 | 苏州天加新材料有限公司 | Thermal contraction bag for packaging cheese |
| CN102126322A (en) * | 2011-01-17 | 2011-07-20 | 吴卓彬 | Multilayer heat shrinkable film |
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2011
- 2011-07-22 CN CN2011102060499A patent/CN102407969A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306593A (en) * | 2008-07-07 | 2008-11-19 | 苏州天加新材料有限公司 | Multilayer coextruding pyrocondensation film |
| CN101306744A (en) * | 2008-07-07 | 2008-11-19 | 苏州天加新材料有限公司 | Thermal contraction bag for packaging cheese |
| CN102126322A (en) * | 2011-01-17 | 2011-07-20 | 吴卓彬 | Multilayer heat shrinkable film |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102963092A (en) * | 2012-12-10 | 2013-03-13 | 张建岭 | Multi-layer coextrusion flakiness casing film |
| CN112261878A (en) * | 2017-12-15 | 2021-01-22 | 日本水产株式会社 | Fresh tuna meat pack, method for producing fresh tuna meat pack, method for suppressing discoloration of fresh tuna meat pieces, and method for providing fresh tuna meat pieces |
| CN110757781A (en) * | 2019-10-30 | 2020-02-07 | 江阴升辉包装材料有限公司 | Production method of high-transparency non-sticky film for packaging glutinous rice cakes |
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Address after: 215122 No. 59, new road, Suzhou Industrial Park, Jiangsu, China Applicant after: Suzhou Tipack Co., Ltd. Address before: 215122 No. 59, new road, Suzhou Industrial Park, Jiangsu, China Applicant before: Suzhou Tianjia New Material Co., Ltd. |
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Application publication date: 20120411 |