CN202862730U - Multi-layer high-barrier co-extruded heat-shrinkable film - Google Patents
Multi-layer high-barrier co-extruded heat-shrinkable film Download PDFInfo
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- CN202862730U CN202862730U CN 201220439641 CN201220439641U CN202862730U CN 202862730 U CN202862730 U CN 202862730U CN 201220439641 CN201220439641 CN 201220439641 CN 201220439641 U CN201220439641 U CN 201220439641U CN 202862730 U CN202862730 U CN 202862730U
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Abstract
The utility model discloses a multi-layer high-barrier co-extruded heat-shrinkable film. The film comprises a heat seal layer, a print layer, an external surface layer, a barrier layer and a connecting layer, wherein a bonding layer is arranged between the heat seal layer and the barrier layer; and the connecting layer is used for the connection between the print layer and the external surface layer. The multi-layer high-barrier co-extruded heat-shrinkable film has excellent bacteria barrier property and relatively high tensile strength; and for goods specially sensitive to air, even if the film is stored for a relatively long time, the risks of color change even aging or change of flavor of foods caused by entrance of bacteria are avoided completely. In addition, by adoption of the external layer, the optical property, the mechanical property, the surface print capability, the tensile strength and the high-temperature seal resistance can also be improved.
Description
Technical field
The utility model relates to the constituent structure of plastic sheeting, is specifically related to a kind of multilayer high-barrier coextruding heat shrinkable film.
Background technology
The packing of commodity for the storage of commodity, guarantee the quality, beautify and have important function.Shrink film has good bandwagon effect, trade mark, icon, packed article are high-visible, beautiful and clean, shrink closely light, also have simultaneously excellent toughness and deflection, excellent package integrity properties can be provided in transportation and handling procedure, the shrinkage tensions of utilizing its high shrinkage to produce can be wrapped the one group of article that will pack, be highly suitable for the assembly package of many article, especially excellent to the packing effect of special-shaped article.At the market initial stage, because the heat-shrinkable film price is higher, domestic except the high enterprise of packing instructions is used, market capacity is not very large.
The disclosed EP1034076B1 of EUROPEAN PATENT OFFICE has discussed a kind of packaging film, but is called the thermal contraction thermoplastic multilayered film, and it has the heat-resisting skin of being made by nylon (PA).Yet these 5 layers of structures, do not have any vistanex (PO) layer as steam being isolated in outside screen layer, and lack outer PO layer and will cause extra high outside curling test, follow with the steam screen layer that highly weakens and the intensity that highly weakens, because ethylene-vinyl alcohol copolymer (EVOH) and PA all are exposed to moisture and are not subjected to any protection.
A kind of multilayer heat shrinkable film is disclosed among the international patent application W000/32393, described heat shrink films has the skin by thermoplastic polymer's compositions of mixtures, this skin has higher fusing point with respect to internal layer, has the generation that dystectic skin can prevent from burning phenomenon.The multilayer heat shrinkable film of preparation has excellent heat seal scope, and internal layer and skin all do not need crosslinked.But such packaging film lacks necessary transparency, glossiness, can't satisfy various products to the degree that requires of film.
Publication number is the multilayered packaging film that discloses the obstruct oxygen of a kind of U.S. Cryovac company application among the CN1216499A, the barrier layer employing evoh layer that uses in this technology and aramid layer and two extexines, two adhesive linkage structures, although do not adopt the PVDC resin, adopt the EVOH resin to do barrier layer, but adopt the method for complicated crosslinking with radiation and chemical crosslinking to realize the production of high shrinking film in the process.
Aspect the fresh-keeping foodstuff packaging film, in order to prolong the shelf-life of Fresh Fruit And Vegetable Flight based food, following treating method is arranged usually:
1, cold storage fresh-keeping method: the Fresh Fruit And Vegetable Flight based food is packed in the common PE bag, and sealing is then-20
0Preserve in the C freezer, freshness date can reach the shelf-life about 1 year.This method is only applicable to long-distance transport and long term storage, but instant transportation and sale after being unsuitable for plucking;
2, chemical fresh-keeping method: with some chemical reagent suppress the Fresh Fruit And Vegetable Flight based food activity, prevent peculiar smell, delay senility and antiseptic.Chemical reagent commonly used such as iron ion antistaling agent, sodium sulphite, sorbic acid, bad hematic acid of L primary antibodie etc.But, long-term healthy totally unfavorable to people of edible these chemical reagent;
3, radiation preservation method: utilize gamma ray irradiation can reduce the Fresh Fruit And Vegetable Flight based food active, suppress or kill microorganisms, reach fresh-keeping purpose.But the food that this x ray irradiation x is crossed is not clear to Health Impact, and oneself enters the market a lot of countries through refusing irradiated fresh-keeping foodstuff;
4, common PE bag vacuum storage; Use common PE bag to vacuumize packing, then 2 ~ 5
0Accumulating and sale in the cold storage environment of C.This method can extend to the shelf-life of Fresh Fruit And Vegetable Flight based food 5 ~ 7 days.But at present domestic consumer environment, it is very short that the shelf-life still shows;
5, inflation air conditioned storage: use the PE bag, be filled with a certain amount of controlled atmosphere gas in the time of packaging fresh fruit vegetables food in bag, gas is mixed according to a certain percentage by nitrogen, carbon dioxide etc., and is then stored refrigerated.This method can better extend the shelf life, but the controlled atmosphere gas that needs special gas flush packaging equipment and correct proportions to mix, and cost is higher.
The utility model content
The purpose of this utility model is to overcome the defective that exists in the prior art, a kind of multi-layer co-extruded PVDC high-barrier heat-shrinkable film that adopts the Multi-layer co-extrusion film-blowing explained hereafter is provided, this film has good oxygen adjusting function, bacterium blocking performance and higher hot strength, even to the responsive especially article of air in addition when the long storage after date, not have fully because bacterium enters and color change occurs and even wears out or the risk of change food flavor yet.And layer structure also can improve optical property, mechanical property, surface printing ability, stretch capability, high temperature resistant envelope and scald.
For achieving the above object, the technical solution of the utility model is a kind of multi-layer co-extruded PVDC high-barrier heat-shrinkable film of design, it is characterized in that, described film comprises hot sealing layer, printed layers, extexine, barrier layer and articulamentum, be provided with tack coat between hot sealing layer and barrier layer, described articulamentum is used for being connected between printed layers and the extexine.
Wherein preferred technical scheme is that the thickness of described hot sealing layer is 50 ~ 250 μ m.
Preferred technical scheme also has, and described barrier layer thickness is 10 ~ 30 μ m.
Preferred technical scheme also has, and described printing, articulamentum and extexine thickness sum are 200 ~ 600 μ m.
Preferred technical scheme also has, and the structure of described multilayer coextruding pyrocondensation film is the 6-10 layer.
Advantage of the present utility model and beneficial effect are: this multi-layer co-extruded high-barrier controlled atmosphere film has good obstruct bacterium performance and higher hot strength, even to the responsive especially article of air in addition when the long storage after date, not have fully because bacterium enters and color change occurs and even wears out or the risk of change food flavor yet.And layer structure also can improve optical property, mechanical property, surface printing ability, stretch capability, high temperature resistant envelope and scald.This controlled atmosphere film also has the following advantages in addition:
1, long shelf-life, the infiltration of carrying out and packing inside and outside gas along with the respiratory activity of Fresh Fruit And Vegetable Flight based food, the oxygen volume ratio content in the final packaging reaches 2 ~ 5%, and carbon dioxide volume ratio content reaches 3 ~ 8%, 2 ~ 5
0Accumulating and sale in the environment of C, the shelf-life of Fresh Fruit And Vegetable Flight based food can reach 25 ~ 60 days.
2, packaged food is safer, and the utility model is used for packaging fresh fruit vegetables food, does not add chemical reagent, does not carry out x ray irradiation x, and food is safer.
3, easy to use, using method is identical with the common PE bag, need not special fill gas regulating the qi flowing in the channels body.
4, the transparency is good, and the utility model is transparent multilaminar co-extrusion film, and the transparency is good, can be good at observing inner Fresh Fruit And Vegetable Flight based food quality.
5, appearance looks elegant, the utility model can be carried out the fineness printing, and outward appearance is beautiful.
6, cost is low, and the utility model is PP TYPE, can obtain 25 ~ 60 days shelf-life, and integrated cost is low.
Description of drawings
Fig. 1 is 6 layers of structural representation in the utility model multilayer high-barrier coextruding heat shrinkable film;
Fig. 2 is 8 layers of structural representation in the utility model multilayer high-barrier coextruding heat shrinkable film;
Fig. 3 is 10 layers of structural representation in the utility model multilayer high-barrier coextruding heat shrinkable film.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection domain of the present utility model with this.
The utility model is a kind of multi-layer co-extruded PVDC high-barrier heat-shrinkable film, this described film comprises hot sealing layer, printed layers, extexine, barrier layer and articulamentum, be provided with tack coat between hot sealing layer and barrier layer, described articulamentum is used for being connected between printed layers and the extexine.
In the utility model, described hot sealing layer comprises vistanex, and its thickness is 50 ~ 250 μ m, its molecular weight 50,000 ~ 200,000, melt index 0.3 ~ 10 g/10min.PO has advantageously realized needed steam screen layer, and can affect the sealability of internal layer, namely may can realize high heat-sealing strength under the heat-sealing temperature minimum.Described hot sealing layer comprises low density polyethylene (LDPE), medium density polyethylene, any one or its any mixture in the Ionomer of high density polyethylene (HDPE), LLDPE, metallocene PE, polypropylene, vinylacetate-ethylene copolymer, methacrylic acid-ethylene copolymer, ethylene-butyl acrylate copolymer, acid modification, described polyolefinic fusing point is 85 ~ 96 ℃.The shared weight percent content of medium density polyethylene is 5 wt% ~ 35 wt% in described hot sealing layer.The weight content of medium density polyethylene can also be 1wt% ~ 50 wt%, more preferably 10 wt% ~ 20 wt%.
Preferred embodiment also has in the utility model, and described barrier layer adopts polyvinyl chloride or polyvinylidene chloride, or its mixture, and its thickness is 10 ~ 30 μ m.The weight percent content of ethene is 20% ~ 38% in described barrier layer.
Preferred embodiment also has in the utility model, printed layers is arranged on extexine, described extexine comprises medium density polyethylene, any one or its any mixture in the Ionomer of high density polyethylene (HDPE), LLDPE, metallocene PE, polypropylene, vinylacetate-ethylene copolymer, methacrylic acid-ethylene copolymer, acid modification, its thickness is 200 ~ 600 μ m, and the fusing point of described extexine is 85 ℃ ~ 125 ℃.This top layer has the advantages that wearability is good, smooth, processability is good.
Preferred embodiment also has in the utility model, and described tack coat (Tie) comprises vinylacetate-ethylene copolymer or maleic anhydride modified ethene polymers, and the density of described vinylacetate-ethylene copolymer is 0.93 ~ 0.94g/cm
3, the shared weight percentage of vinylacetate-ethylene copolymer is 5% ~ 25% in described multi-layer co-extruded heat-shrinkable film.
Preferred embodiment also has in the utility model, and the structure of described multilayer high-barrier coextruding heat shrinkable film is the 6-10 layer.6 layers of structure wherein, namely, each layer material is from top to bottom: MD/PO/ Tie/PVDC/Tie/PO, or 8 layers of structure, that is, each layer material is MD/PO/Tie/PA/PVDC/PA/Tie/PO from top to bottom, or 10 layers of structure, that is, each layer material is MD/PET/ Tie/PO/Tie/PA/PVDC/PA/Tie/PO from top to bottom.
Preferred embodiment also has in the utility model, is added with at least a in slipping agent, antitack agent, antistatic additive and the color masterbatch in described hot sealing layer, printing and extexine and barrier layer.
Embodiment 1
Structure is 6 layer co-extrusion high-isolation films as shown in Figure 1, this co-extrusion high-isolating and controlled atmosphere film are by printed layers (F) and two-layer vistanex (A and E), one deck polyvinylidene chloride barrier layer (C) and two-layer binding material (B and D), on the top layer, there is printed layers F to consist of, the thickness of wherein said hot sealing layer is 50 μ m, barrier layer thickness is 10 μ m, and printing is 200 μ m with skin depth.The thickness proportion of each layer is A and F:B: C: D: E=5%:25%: 15%: 10%: 15%: 30%, and the heat sealability of this structural membrane is good, has to hinder preferably bacterium and hinder wet ability to reach optionally air permeable effect.
After ground floor F printed layers, co-extrusion film are shaped by printing equipment, with graph text information be attached to vistanex A above.
Second layer A is by the mixture (weight content scope be 0% ~ 60%) of an extruder with primary raw material resin ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, and wherein the alhpa olefin weight content is 1% ~ 20%; Ethene and EMAA[are ethene-(methyl) acrylic acid zinc salt, sodium salt, lithium salts plasma key condensate], EVA(ethene and acetate copolymer), EBA(butyl acrylate and ethylene copolymer) copolymer, wherein carboxylic acid monomer's weight content is 5% ~ 25%, in extruder front end mixed-hopper behind the uniform stirring, under 160 ~ 280 ℃, with resin plasticizing, clamp-on in the runner of ground floor A of mould;
The 3rd layer of B by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of second layer B of mould;
The 4th layer of C respectively by an extruder, under 160 ~ 280 ℃, with PVDC resin plasticizing, clamp-ons in the runner of the 3rd layer of C of mould;
Layer 5 D by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of the 4th layer of D of mould;
Layer 6 E,, under 160 ~ 280 ℃, with the resin plasticizing, is clamp-oned in the runner of five layers of E of mould in extruder front end mixed-hopper behind the uniform stirring primary raw material resin PO and additive by an extruder.
Embodiment 2
Structure is eight layer high-barrier films as shown in Figure 2, this high-barrier and controlled atmosphere film are by printed layers (H) and two-layer vistanex (A and G), two-layer PA barrier layer (C and E), one deck polyvinylidene chloride barrier layer (D) consist of with two-layer binding material (B and F), the thickness of wherein said hot sealing layer is 150 microns, barrier layer thickness is 15 microns, and skin depth is 400 microns.The thickness proportion of each layer is H and A: B: C: D: E: F: G=27%: 15%: 8%: 8%: 8%: 15%: 17%.Have good oxygen and steam barrier, high shrinkage factor can be used for the fresh-keeping shrink wrapping of cold fresh meat and cheese.
After ground floor H printed layers, co-extrusion film are shaped by printing equipment, with graph text information be attached to vistanex above.
Second layer A is by the mixture (weight content scope be 0% ~ 60%) of an extruder with primary raw material resin ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, and wherein the alhpa olefin weight content is 1% ~ 20%; The copolymer of ethene and EMAA, EVA, EBA, wherein carboxylic acid monomer's weight content is 5% ~ 25%, in extruder front end mixed-hopper behind the uniform stirring, under 160 ~ 280 ℃, with the resin plasticizing, clamp-ons in the runner of the A of the superiors of mould;
The 3rd layer of B by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of second layer B of mould;
The 4th layer of C and layer 6 E respectively by an extruder, in extruder front end mixed-hopper behind the uniform stirring, under 220 ~ 280 ℃, with the resin plasticizing, clamp-on primary raw material resin PA and additive in the runner of the 3rd layer of C of mould and layer 5 E;
Layer 5 D respectively by an extruder, under 160 ~ 280 ℃, with PVDC resin plasticizing, clamp-ons in the runner of layer 5 D of mould;
Layer 7 F by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of layer 7 F of mould;
The 8th layer of G,, under 160 ~ 280 ℃, with the resin plasticizing, clamp-oned in the runner of eight layers of G of mould in extruder front end mixed-hopper behind the uniform stirring main vistanex PO and additive by an extruder.
Embodiment 3
Structure is ten layer co-extrusion high-isolation films as shown in Figure 3, this co-extrusion high-isolating and controlled atmosphere film are by the outer ethylene diester of printed layers (J) (PET (A)) two-layer vistanex (C and I), two-layer PA barrier layer (E and G), one deck polyvinylidene chloride barrier layer (F) consist of with three layers of binding material (B, D and H), the thickness of wherein said hot sealing layer is 250 microns, barrier layer thickness is 30 microns, and skin depth is 600 microns.Have good oxygen and steam barrier, high shrinkage factor, the surface is undertaken the printing of effective, can be used for the fresh-keeping shrink wrapping of cold fresh meat and cheese.
After ground floor J printed layers, co-extrusion film are shaped by printing equipment, with graph text information be attached to vistanex above.
Second layer A,, under 160 ~ 280 ℃, with the resin plasticizing, is clamp-oned in the runner of the A of the superiors of mould in extruder front end mixed-hopper behind the uniform stirring primary raw material resin PET and additive by an extruder;
The 3rd layer of B by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of the 3rd layer of B of mould;
The 4th layer of C is by the mixture (weight content scope be 0% ~ 60%) of an extruder with primary raw material resin ethylene-alpha-olefin copolymer or multiple ethylene-alpha-olefin copolymer, and wherein the alhpa olefin weight content is 1% ~ 20%; The copolymer of ethene and EMAA, EVA, EBA, wherein carboxylic acid monomer's weight content is 5% ~ 25%, in extruder front end mixed-hopper behind the uniform stirring, under 160 ~ 280 ℃, with the resin plasticizing, clamp-ons in the runner of four layers of C of mould;
Layer 5 D by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of layer 5 D of mould;
Layer 6 E and the 8th layer of G respectively by an extruder, in extruder front end mixed-hopper behind the uniform stirring, under 220 ~ 280 ℃, with the resin plasticizing, clamp-on primary raw material resin PA and additive in the runner of the layer 6 E of mould and the 8th layer of G;
Layer 7 F respectively by an extruder, under 160 ~ 280 ℃, with PVDC resin plasticizing, clamp-ons in the runner of layer 7 F of mould;
The 9th layer of H by an extruder, under 160 ~ 280 ℃, with jointing material resin plasticizing, clamp-ons in the runner of the 9th layer of H of mould;
The tenth layer of I,, under 160 ~ 280 ℃, with the resin plasticizing, clamp-oned in the runner of ten layers of I of mould in extruder front end mixed-hopper behind the uniform stirring primary raw material resin PO and additive by an extruder.
The hot water shrinkage of the above high-barrier and controlled atmosphere film, vertical in 80 ℃ of water/horizontal＞20 ~ 50%, its hot strength 〉=28pa, elongation at break 〉=500, light transmittance＞88, OTR oxygen transmission rate≤20cm
3/ m
224H0.1mpa, rate of perviousness≤4 g/m
224H.
The above only is preferred embodiment of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. multilayer high-barrier coextruding heat shrinkable film, it is characterized in that, described film comprises hot sealing layer, printed layers, extexine, barrier layer and articulamentum, is provided with tack coat between hot sealing layer and barrier layer, and described articulamentum is used for being connected between printed layers and the extexine.
2. multilayer high-barrier coextruding heat shrinkable film as claimed in claim 1 is characterized in that, the thickness of described hot sealing layer is 50 ~ 250 μ m.
3. multilayer high-barrier coextruding heat shrinkable film as claimed in claim 1 is characterized in that, described barrier layer thickness is 10 ~ 30 μ m.
4. multilayer high-barrier coextruding heat shrinkable film as claimed in claim 1 is characterized in that, described printing, articulamentum and extexine thickness sum are 200 ~ 600 μ m.
5. multilayer high-barrier coextruding heat shrinkable film as claimed in claim 1 is characterized in that, the structure of described multilayer coextruding pyrocondensation film is the 6-10 layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220439641 CN202862730U (en) | 2012-08-30 | 2012-08-30 | Multi-layer high-barrier co-extruded heat-shrinkable film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220439641 CN202862730U (en) | 2012-08-30 | 2012-08-30 | Multi-layer high-barrier co-extruded heat-shrinkable film |
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| CN202862730U true CN202862730U (en) | 2013-04-10 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149446A (en) * | 2014-07-17 | 2014-11-19 | 上海唐科新型包装材料有限公司 | High-barrier membrane and preparation method thereof |
| CN104494262A (en) * | 2014-12-25 | 2015-04-08 | 哈尔滨隆华艺达包装制品有限公司 | Coextrusion-lamination obstructing packaging film |
| CN105265557A (en) * | 2014-07-25 | 2016-01-27 | 天津剑纳沃特塑化科技有限公司 | High-separation low-temperature sausage casing membrane |
| CN105313410A (en) * | 2014-07-25 | 2016-02-10 | 天津亨美新型包装科技有限公司 | Fresh meat refrigerating film packaging bag |
| CN107336495A (en) * | 2017-06-27 | 2017-11-10 | 汕头市玛利宝包装有限公司 | A kind of food package film with fresh-keeping and airtight sexual function and preparation method thereof |
| CN109093974A (en) * | 2018-08-02 | 2018-12-28 | 洛阳兴瑞新材料科技有限公司 | A kind of mold and film-forming method of the stretchable co-extrusion film of extrudable PVDC high-barrier |
-
2012
- 2012-08-30 CN CN 201220439641 patent/CN202862730U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149446A (en) * | 2014-07-17 | 2014-11-19 | 上海唐科新型包装材料有限公司 | High-barrier membrane and preparation method thereof |
| CN105265557A (en) * | 2014-07-25 | 2016-01-27 | 天津剑纳沃特塑化科技有限公司 | High-separation low-temperature sausage casing membrane |
| CN105313410A (en) * | 2014-07-25 | 2016-02-10 | 天津亨美新型包装科技有限公司 | Fresh meat refrigerating film packaging bag |
| CN104494262A (en) * | 2014-12-25 | 2015-04-08 | 哈尔滨隆华艺达包装制品有限公司 | Coextrusion-lamination obstructing packaging film |
| CN104494262B (en) * | 2014-12-25 | 2016-06-08 | 哈尔滨隆华艺达包装制品有限公司 | Coextru-lamination barrier packaging film |
| CN107336495A (en) * | 2017-06-27 | 2017-11-10 | 汕头市玛利宝包装有限公司 | A kind of food package film with fresh-keeping and airtight sexual function and preparation method thereof |
| CN109093974A (en) * | 2018-08-02 | 2018-12-28 | 洛阳兴瑞新材料科技有限公司 | A kind of mold and film-forming method of the stretchable co-extrusion film of extrudable PVDC high-barrier |
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| CP01 | Change in the name or title of a patent holder |
Address after: 214400 No.2 Tonggang Road, Changjing Town, Jiangyin, Wuxi, Jiangsu Province Patentee after: Shenghui New Material Co.,Ltd. Address before: 214400 No.2 Tonggang Road, Changjing Town, Jiangyin, Wuxi, Jiangsu Province Patentee before: Shenghui new materials Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 214400 No.2 Tonggang Road, Changjing Town, Jiangyin, Wuxi, Jiangsu Province Patentee after: Shenghui new materials Co.,Ltd. Address before: 214400 No.2, Tonggang Road, Changjing Industrial Park, Jiangyin City, Jiangsu Province Patentee before: JIANGYIN SUNRISE PACKAGING MATERIAL Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20130410 |