CN101306744A - Thermal contraction bag for packaging cheese - Google Patents
Thermal contraction bag for packaging cheese Download PDFInfo
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- CN101306744A CN101306744A CNA2008101242695A CN200810124269A CN101306744A CN 101306744 A CN101306744 A CN 101306744A CN A2008101242695 A CNA2008101242695 A CN A2008101242695A CN 200810124269 A CN200810124269 A CN 200810124269A CN 101306744 A CN101306744 A CN 101306744A
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Abstract
The invention provides a thermal shrinkage bag for cheese package, comprising a surface layer, a core layer and a heat-sealing layer. The surface layer and the heat-sealing layer are respectively bonded with the core layer via binding layers, the core layer is a mixture of 98wt% of PVDC resin and 2wt% of processing assistant, the PVDC resin is a VDC-MA copolymer, the processing assistant is an epoxy soybean oil or other plasticizer systems; the surface layer contains resin a and resin b, the resin a is an ethylene-ALPHA-olefin copolymer or a mixture of multiple ethylene-ALPHA-olefin copolymers, the resin b is an EMAA, EAA, EVA, EBA or EEA copolymer; and the heat-sealing layer comprises resin c and resin d, the resin c is a copolymer of ethylene and propylene, butylenes, hexylene-1 or octylene-1, and the resin d is a mixture of one or more selected from LLDPE, POP, VLDPE, LMDPE and CEO. The technical proposal provided in the invention effectively solves the shrinkage ratio, barrier properties and other problems; has proper oxygen and carbon dioxide gas permeation ratio and excellent heat seal-ability; and is suitable for fresh-keeping shrink package of cheese.
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 packaging cheese, 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.As " 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 is CN1411409A, all be to blow water-cooled with flat forcing down, the heat shrink films of being furnished with radiation and thermosetting device of double bubble process production, these products are used in present market and are played very big effect, but the heat shrink temperature of these heat shrink films is mostly between 80～95 ℃, because fresh meat Package can only be used this class heat shrink films at present, if package processing is tactless, make the too high or thermal contraction overlong time of temperature, tend to cause fresh meat surface to be scalded, destroy 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 and hot sticky intensity are all not enough when running into pollution.Select for use LLDPE to do heat-sealable material, its low-temperature heat-sealing 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 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, the heat-sealing line is imperfect, diaphaneity is not high, and its outward appearance is bad.
Be badly in need of a kind of height that can have high shrinkage, good barrier at low temperatures in the market and shrink bag.
Summary of the invention
The purpose of this invention is to provide a kind of multi-layer co-extruded thermal contraction bag that is used for packaging cheese, be intended to effectively overcome that existing multi-layer co-extruded thermal contraction bag shrinkage percentage is low, convergent force big, barrier is poor, technological deficiency such as more crisp under the low temperature, to satisfy the operating needs of the fresh-keeping shrink wrapping of cheese preferably.
Purpose of the present invention is achieved through the following technical solutions:
The thermal contraction bag that is used for packaging cheese, 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 by 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 2Wt%, described PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Described processing aid is epoxidized soybean oil or other plasticiser system;
Described top layer 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 EMAA, EAA, EVA, EBA or EEA copolymer, and wherein carboxylic acid monomer's weight content is 5%～15%;
Described hot sealing 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, wherein the alhpa olefin weight content is 1%～18%; 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 bag that is used for packaging cheese, described bonding coat comprise EVA or maleic anhydride modified ethene polymers, and when comprising EVA, the weight percentage of the VA of EVA resin is 12%～28%, and density is 0.93～0.95g/cm
3
Further, the above-mentioned thermal contraction bag that is used for packaging cheese, the thickness range of described sandwich layer is at 3～12 microns; The thickness range on described top layer is at 8～10 microns; The thickness range of described hot sealing layer is at 18～25 microns; The thickness in monolayer scope of described bonding coat is at 3～5 microns.
The invention a kind of thermal contraction bag that is used for packaging cheese, overcome that general multi-layer co-extruded thermal contraction bag shrinkage percentage 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 the ventilative ratio of suitable oxygen and carbon dioxide, 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; Good optical property: diaphaneity is better; Good strength under shock: paracentesis resistance, low temperature resistance, low volatility, good water vapor barrier, adhesion-resistant slippery and bag are widely used in the fresh-keeping shrink wrapping of cheese.
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 for the cross section structure scheme drawing of the thermal contraction bag of packaging cheese.
The implication of each Reference numeral sees the following form among the figure:
| Reference numeral | Implication | Reference numeral | Implication | Reference numeral | Implication |
| A | The top layer | B | Sandwich layer | C | Hot sealing layer |
| D | Bonding coat | E | Bonding coat |
The specific embodiment
As shown in Figure 1, be used for the thermal contraction bag of packaging cheese, 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 by bonding coat D and sandwich layer C, and hot sealing layer C is bonding by bonding coat E and sandwich layer B.The thickness range of sandwich layer B is at 3～12 microns; The thickness range of top layer A is at 8～10 microns; The thickness range of hot sealing layer C is at 18～25 microns; The thickness range of bonding coat D and bonding coat E is at 3～5 microns.
The compound that sandwich layer B is made up of the processing aid of PVDC resin that comprises 98Wt% and 2Wt%, described PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Described 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 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 EMAA, EAA, EVA, EBA or EEA copolymer, and wherein carboxylic acid monomer's weight content is 5%～15%.
Hot sealing 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, wherein the alhpa olefin weight content is 1%～18%; 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.
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 12%～28%, and density is 0.93～0.95g/cm
3
Embodiment 1:
Join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:98kg and the epoxidized soybean oil of 2kg.The ethene of the ethylene-propylene copolymer of top layer A:40kg and 60kg-EBA copolymer, the density of ethylene-propylene copolymer are 0.917g/cm
3The ethylene-butene copolymer of hot sealing layer C:60kg and the VLDPE of 40kg, the density of ethene-butylene is 0.89g/cm
3, the density of VLDPE is 0.918g/cm
3The EVA of bonding coat D and bonding coat E:12kg, density is 0.93g/cm
3
The extruder that each layer raw material is added each layer respectively carries out fusion plastification, thereby enters the circular melt pipe that distribution that a multi-layer co-extruded circular die carries out melt forms a multilayer then; 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, carry out bag.
Embodiment 2:
Join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:98kg and the epoxidized soybean oil of 2kg.The ethene of the ethylene-propylene copolymer of top layer A:50kg and 50kg-EEA copolymer, the density of ethylene-propylene copolymer are 0.88g/cm
3The LMDPE of the ethene of hot sealing layer C:80kg--hexene-1 copolymer and 20kg, the density of ethene--hexene-1 copolymer is 0.916g/cm
3, the density of LMDPE is 0.90g/cm
3The EVA of bonding coat D and bonding coat E:28kg, density is 0.95g/cm
3
Other method and structure is identical with the specific embodiment 1.
Embodiment 3:
Join each layer raw material earlier, the VDC-MA co-polymer of sandwich layer B:98kg and the epoxidized soybean oil of 2kg.The ethene of top layer A:100kg-EMAA copolymer.The ethene of hot sealing layer C:100kg--octene-1 copolymer, the density of ethene--octene-1 copolymer is 0.918g/cm
3Bonding coat D and the maleic anhydride modified ethene polymers of bonding coat E:12kg.
Other method and structure is identical with the specific embodiment 1.
After testing, the heat shrink films that adopts technical solution 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 | 51MPa | 55MPa | 52MPa |
| Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Light transmittance | 80％ | 82％ | 85％ |
| In length and breadth to breaking elongation | 112％ | 110％ | 111％ |
| Sealing-strength | 16N/15mm | 15N/15mm | 15N/15mm |
The invention a kind of thermal contraction bag that is used for packaging cheese, 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 the ventilative ratio of suitable oxygen and carbon dioxide, 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; Good optical property: diaphaneity is better; Good strength under shock: paracentesis resistance, low temperature resistance, low volatility, good water vapor barrier, adhesion-resistant slippery and bag.
Above-mentioned thermal contraction bag has the advantage of low temperature highly shrinkable; Its preparation method has that difficulty of processing is low, the characteristics of non-environmental-pollution.Belong to the vacuum shrink wrap material that improves air conditions, better be applicable to the fresh-keeping shrink wrapping of cheese.
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 (6)
1. the thermal contraction bag that is used for packaging cheese, 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 by 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 2Wt%, described PVDC resin is the VDC-MA co-polymer, 150 ℃ of fusing points, density 1.7g/cm
3Described processing aid is epoxidized soybean oil or other plasticiser system;
Described top layer 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 EMAA, EAA, EVA, EBA or EEA polymers, and wherein carboxylic acid monomer's weight content is 5%～15%;
Described hot sealing 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, wherein the alhpa olefin weight content is 1%～18%; 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.
2. the thermal contraction bag that is used for packaging cheese according to claim 1, it is characterized in that: described bonding coat comprises EVA or maleic anhydride modified ethene polymers, when comprising EVA, the weight percentage of the VA of EVA resin is 12%～28%, and density is 0.93～0.95g/cm
3
3. the thermal contraction bag that is used for packaging cheese according to claim 1 is characterized in that: the thickness range of described sandwich layer is 3～12 microns.
4. the thermal contraction bag that is used for packaging cheese according to claim 1 is characterized in that: the thickness range on described top layer is 8～10 microns.
5. the thermal contraction bag that is used for packaging cheese according to claim 1 is characterized in that: the thickness range of described hot sealing layer is 18～25 microns.
6. the thermal contraction bag that is used for packaging cheese according to claim 1 and 2 is characterized in that: the thickness in monolayer scope of described bonding coat is 3～5 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101242695A CN101306744B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction bag for packaging cheese |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101242695A CN101306744B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction bag for packaging cheese |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101306744A true CN101306744A (en) | 2008-11-19 |
| CN101306744B CN101306744B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101242695A Active CN101306744B (en) | 2008-07-07 | 2008-07-07 | Thermal contraction bag for packaging cheese |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101306744B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407969A (en) * | 2011-07-22 | 2012-04-11 | 苏州天加新材料有限公司 | Heat-shrinkable bag for packaging marine product |
| CN103042730A (en) * | 2012-12-21 | 2013-04-17 | 江阴升辉包装材料有限公司 | Bag for automatic cheese canning |
| CN108977156A (en) * | 2018-06-29 | 2018-12-11 | 佛山市高明区爪和新材料科技有限公司 | A kind of high-temp resisting high-humidity resisting is packed for the preparation method of binder |
| CN113844698A (en) * | 2021-09-28 | 2021-12-28 | 绵阳艾佳科技有限公司 | Novel process for normal-temperature transportation of pork fresh-keeping bag after thermal shrinkage, plastic molding, hardening and fresh keeping |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1282672B1 (en) * | 1996-02-23 | 1998-03-31 | Grace W R & Co | THERMOPLASTIC MATERIAL FILMS WITH GAS BARRIER PROPERTY |
| US6117541A (en) * | 1997-07-02 | 2000-09-12 | Tetra Laval Holdings & Finance, Sa | Polyolefin material integrated with nanophase particles |
| JP3589640B2 (en) * | 2000-11-01 | 2004-11-17 | 旭化成ライフ＆リビング株式会社 | Packaging film |
| US7569276B2 (en) * | 2003-12-22 | 2009-08-04 | Dupont Teijin Films U.S. Limited Partnership | Thermoformable polyester-containing laminates |
-
2008
- 2008-07-07 CN CN2008101242695A patent/CN101306744B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407969A (en) * | 2011-07-22 | 2012-04-11 | 苏州天加新材料有限公司 | Heat-shrinkable bag for packaging marine product |
| CN103042730A (en) * | 2012-12-21 | 2013-04-17 | 江阴升辉包装材料有限公司 | Bag for automatic cheese canning |
| CN103042730B (en) * | 2012-12-21 | 2015-04-08 | 江阴升辉包装材料有限公司 | Bag for automatic cheese canning |
| CN108977156A (en) * | 2018-06-29 | 2018-12-11 | 佛山市高明区爪和新材料科技有限公司 | A kind of high-temp resisting high-humidity resisting is packed for the preparation method of binder |
| CN113844698A (en) * | 2021-09-28 | 2021-12-28 | 绵阳艾佳科技有限公司 | Novel process for normal-temperature transportation of pork fresh-keeping bag after thermal shrinkage, plastic molding, hardening and fresh keeping |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101306744B (en) | 2011-04-13 |
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