CN102126323A - Multilayer thermal shrinkage film - Google Patents
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- CN102126323A CN102126323A CN2011100092654A CN201110009265A CN102126323A CN 102126323 A CN102126323 A CN 102126323A CN 2011100092654 A CN2011100092654 A CN 2011100092654A CN 201110009265 A CN201110009265 A CN 201110009265A CN 102126323 A CN102126323 A CN 102126323A
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Abstract
The invention provides a multilayer thermal shrinkage film, which comprises a heat sealing layer contacted with a package, an outer layer and a middle layer; the outer layer comprises reinforced medium density polyethylene and one or more of very low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer and ethylene alpha-olefin plastic copolymer; the middle layer comprises ethylene-vinyl acetate copolymer; and the heat sealing layer comprises one or more of very low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer and ethylene alpha-olefin plastic copolymer. The reinforced medium density polyethylene is added in the outer layer of the multilayer thermal shrinkage film, and the reinforced medium density polyethylene has high stiffness, better impact strength and longitudinal tearing strength. When a proper amount of reinforced medium density polyethylene is matched with other components in the outer layer, the mechanical property of the multilayer thermal shrinkage film can be obviously improved.
Description
Technical field
The present invention relates to packaging material, be specifically related to a kind of multilayer heat shrinkable film.
Background technology
The packing of commodity for the storage of commodity, transport, guarantee the quality, beautify and have important function.Along with development of technology, people have proposed higher performance requirement for packaging material.At present, multilayer heat shrinkable film has been widely used in the packing of commodity such as food and industrial goods as a kind of packaging material of excellent performance.Compare with the Traditional Packing material, multilayer heat shrinkable film has lot of advantages: for example, heat shrink films can reach the effect of " fit " packing to commodity after thermal contraction, therefore can make commodity keep own face shaping, makes the attractive in appearance and conserve space of exterior of commodity; Can reach effect long-time fresh-keeping and that guarantee the quality when and for example, the multilayer heat shrinkable film that has an oxidation prevention layer is used for packaging for foodstuff such as meat and cheese.
Multilayer heat shrinkable film in use generally comprises the production, processing, use multilayer heat shrinkable film packaging product of multilayer heat shrinkable film, the links such as transportation, storage and sale of packing back product.Be specially, use different raw materials to require to make various multilayer heat shrinkable films earlier according to difference, then multilayer heat shrinkable film is processed into the form of tubular film, be processed into the thermal contraction bag of all size again according to product to be packaged different parts and big young pathbreaker's tubular film production, then thermal contraction bag is given production department product is packed, reach the ultimate consumer through links such as transportation, storage and sale successively more at last.
In above-mentioned link, various performance requirements have been proposed multilayer heat shrinkable film, as percent thermal shrinkage, resistance oxygen rate, punctured resistance, hot strength, heat seal strength, heat-sealing temperature, optical property etc.In order to satisfy the requirement of above-mentioned various performance indications, corresponding requirement has been proposed also for material, structure and the technology of heat shrink films.The basic structure of heat shrink films generally comprises one from outside to inside directly in the face of the skin of external environment condition, sandwich layer that plays the gas barrier effect and the hot sealing layer that directly contacts with packaging product.
At present, hot sealing layer and outer used material usually comprise in polypropylene (PP), very low density polyethylene (VLDPE), LLDPE (LLDPE), vinyl-vinyl acetate copolymer (EVA), ethylene ' alpha '-olefin plastomer copolymers, the metallocene PE in one or more mixtures.In the prior art, when using above-mentioned material to prepare heat-shrinkable film, in order to make multi-laser heat-shrinkable film reach satisfactory puncture resistance and hot strength, needs use electron-beam accelerator (E-beam) thereby shining the composition that makes in the film produces cross-linking reaction, thereby improve the mechanical performance of multilayer heat shrinkable film.
Electron-beam accelerator is that a kind of very expensive irradiation is applied to the equipment that heat shrink films is produced, though use electron-beam accelerator can improve the mechanical performance of heat shrink films, has also increased cost, and has increased procedure of processing, has also reduced production efficiency.In addition,, also can make the composition generation oxidation of oxidation prevention layer present yellow, also influence the exterior quality of heat shrink films if use electron-beam accelerator to shine when having the heat shrink films of oxidation prevention layer.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of multilayer heat shrinkable film, and compared with prior art, multilayer heat shrinkable film provided by the invention assigns to improve the mechanical performance of heat shrink films by changing outer field one-tenth.
In order to solve above technical problem, the invention provides a kind of multilayer heat shrinkable film, comprising:
With hot sealing layer, the skin of package contact, be connected described hot sealing layer and outer field intermediate layer;
Described skin comprises the mixture that strengthens medium density polyethylene and be selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more;
Described intermediate layer comprises vinyl-vinyl acetate copolymer;
Described hot sealing layer comprises the mixture that is selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more.
Preferably, the weight content of the enhancing medium density polyethylene in the described skin is 1wt%～50wt%, is preferably 5wt%～35wt%, more preferably 10wt%～20wt%.
Preferably, the thickness in described intermediate layer is 2.5 μ m～40 μ m, more preferably 5 μ m～35 μ m, more preferably 10-30 μ m.
Preferably, described intermediate layer comprises the oxidation prevention layer of the outer adhesive layer that is connected with described skin, the interior adhesive layer that is connected with described hot sealing layer, the described outer adhesive layer of connection and described interior adhesive layer;
Described outer adhesive layer comprises vinyl-vinyl acetate copolymer, and described interior adhesive layer comprises vinyl-vinyl acetate copolymer.
Preferably, described oxidation prevention layer comprises one or more the mixture in polyvinylidene chloride, ethylene-vinyl ester copolymer, the polyamide.
Preferably, the thickness of described oxidation prevention layer is 2.5 μ m～12 μ m, is preferably 3 μ m～11 μ m, more preferably 5-10 μ m.
Preferably, the thickness of described multilayer heat shrinkable film is 3-130 μ m, is preferably 10-100 μ m, more preferably 30 μ m～100 μ m, more preferably 45 μ m～70 μ m.
Preferably, the thickness of described hot sealing layer is 1-35 μ m, more preferably 5～25 μ m, more preferably 8 μ m～20 μ m.
Preferably, described hot sealing layer also comprises the enhancing medium density polyethylene.
Preferably, the content of the enhancing medium density polyethylene in the described hot sealing layer is 1wt%～50wt%, is preferably 5wt%～35wt%, more preferably 10wt%～20wt%.
The invention provides a kind of multilayer heat shrinkable film, in the skin of this multilayer heat shrinkable film, the present invention has added the enhancing medium density polyethylene.Compare with other compositions in the skin, strengthen medium density polyethylene and have higher deflection, better impact strength and machine direction tear.Therefore, when with an amount of enhancing medium density polyethylene and other components matching in the skin, can obviously improve the mechanical performance of multilayer heat shrinkable film.
A kind of preferred embodiment in, the present invention has added the enhancing medium density polyethylene simultaneously in outer and hot sealing layer, experimental result shows, the multilayer heat shrinkable film that present embodiment provides just can show excellent mechanical performance without the irradiation of electron accelerator, and makes multilayer heat shrinkable film can keep good processing properties and appearance property.Because the irradiation without electron accelerator has not only reduced production cost, and has saved operation, has improved production efficiency.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, but should be appreciated that these describe just to further specifying the features and advantages of the present invention, rather than to the restriction of claim of the present invention.
The invention provides a kind of heat shrink films, comprise the skin that contacts with the hot sealing layer of package contact, with external environment condition, be connected described hot sealing layer and outer field intermediate layer;
Described skin comprises the mixture that strengthens medium density polyethylene and be selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more;
Described intermediate layer comprises vinyl-vinyl acetate copolymer;
Described hot sealing layer comprises the mixture that is selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more.
The present invention has added the enhancing medium density polyethylene in skin, strengthen medium density polyethylene and compare with other composition, has higher deflection, better dart impact strength and machine direction tear.When using, can obviously improve outer field mechanical performance, and make outer good processability and the appearance property that keep with other components matching.Enhancing medium density polyethylene among the present invention can use the enhancing medium density polyethylene of public offering on the market, the model that object lesson can be produced for Dow Chemical (the Dow Chemical Company) is that ELITE 5538G type strengthens medium density polyethylene, but is not limited thereto.
According to the present invention, described outer raw material are except comprising the enhancing medium density polyethylene, can also comprise thermoplastic resin or thermoplastic resin intermixture except that strengthening medium density polyethylene, described thermoplastic resin is preferably metallocene-polyolefin, as ethylene copolymer, object lesson can be ethene-alpha-olefin copolymer, LLDPE (LLDPE), very low density polyethylene (VLDPE), vinyl-vinyl acetate copolymer (EVA), ethylene acrylic acid co polymer, ethylene-methyl acrylate copolymer (EMA), ethylene-butyl acrylate copolymer (EBA), metallocene low density polyethylene (LDPE) (SSC-LLDPE) and metallocene low density polyethylene (LDPE) SSC-VLDPE etc.Can use above-mentioned a kind of ethylene copolymer, also can use multiple mixture, there is no particular restriction to this present invention, preferably uses metallocene linear-low density polyethylene.
According to the present invention, the weight content for the enhancing medium density polyethylene in the skin is preferably 1wt%～50wt%, more preferably 5wt%～35wt%, more preferably 10wt%～20wt%.For outer field thickness, be preferably 1-35 μ m, more preferably 5～25 μ m, more preferably 8 μ m～20 μ m.
In the middle of skin among the present invention and the hot sealing layer is the intermediate layer, an effect in intermediate layer is to connect skin and hot sealing layer, the intermediate layer preferably includes vinyl-vinyl acetate copolymer (EVA), the intermediate layer can comprise one deck vinyl-vinyl acetate copolymer, this moment, multilayer heat shrinkable film provided by the invention was a trilamellar membrane, was preferred for the packing of frozen food, and this moment, the thickness in intermediate layer was preferably 2.5 μ m～40 μ m, 5 μ m～35 μ m, more preferably 10-30 μ m more preferably.
For oxidation prevention layer, its objective is secluding air, the object lesson of oxidation prevention layer can be for comprising ethene and at least a copolymer that contains the oxygen atom monomer in its molecule, its object lesson can be EVA, EMAA, ethylene-methyl methacrylate-unsaturated aliphatic polymers of carboxylic acid, EMA, EAA, EBA and IO resin.Normally select PVDC, EVOH, nylon or their composite material as the object of packing for its oxygen barrier materials of product such as ice aquatic foods or chilled meats according to requirement of actual application.The thickness of oxidation prevention layer is preferably 2.5 μ m～12 μ m, more preferably 3 μ m～11 μ m, more preferably 5-10 μ m.
For hot sealing layer, preferred use thermoplastic resin or thermoplastic resin intermixture, described thermoplastic resin is preferably the use metallocene-polyolefin, as ethylene copolymer, object lesson can be ethene-alpha-olefin copolymer, LLDPE (LLDPE), very low density polyethylene (VLDPE), vinyl-vinyl acetate copolymer (EVA), ethylene acrylic acid co polymer, ethylene-methyl acrylate copolymer (EMA), ethylene-butyl acrylate copolymer (EBA), metallocene linear-low density polyethylene (SSC-LLDPE) and metallocene very low density polyethylene SSC-VLDPE etc.Can use above-mentioned a kind of ethylene copolymer, also can use multiple mixture, there is no particular restriction to this present invention, preferably uses metallocene linear-low density polyethylene.
A kind of preferred embodiment in, can also in hot sealing layer, add and strengthen medium density polyethylene, strengthen medium density polyethylene can use with skin in the same material of enhancing medium density polyethylene, the weight content of the enhancing medium density polyethylene in the hot sealing layer is preferably 1wt%～50wt%, more preferably 5wt%～35wt%, more preferably 10wt%～20wt%.For the thickness of hot sealing layer, be preferably 1-35 μ m, more preferably 5～25 μ m, more preferably 8 μ m～20 μ m.
When in outer and hot sealing layer, adding the enhancing medium density polyethylene simultaneously, needn't use the electron accelerator irradiation, just can make heat shrink films have excellent mechanical performance, good processing properties and appearance property, therefore not only significantly reduced the processing cost of multilayer heat shrinkable film, and reduced the irradiating step of electron accelerator, improved production efficiency.
Gross thickness for multilayer heat shrinkable film, be preferably 3-130 μ m, 10-100 μ m more preferably, 30 μ m～100 μ m more preferably, 45 μ m～70 μ m more preferably, if multilayer heat shrinkable film is blocked up, has not only increased the production cost of multilayer heat shrinkable film, and reduced the flexibility of multilayer heat shrinkable film.
Production method for heat shrink films, the present invention is also without particular limitation, as each layer formed the base pipe that does not stretch as yet by the extruder coextrusion respectively, and then use those skilled in the art's method such as stenter method biaxially oriented film and form, draw ratio all can be preferably 2.5～5 times at vertical and horizontal.The multi-laser heat-shrinkable film of Sheng Chaning can be according to known direct multi-layer co-extruded blown film method or the multi-layer co-extruded compound blown film method of base pipe that is equipped with according to the method described above.
When producing multilayer heat shrinkable film, can produce according to disclosed coextrusion method well known to those skilled in the art in the prior art, carry out as Chinese patent 95119954.4 disclosed methods, the production method of multilayer heat shrinkable film belongs to the common technology that belongs to this area, and there is no particular restriction in the present invention.
Hot water shrinkage during 90 ℃ of multi-laser heat-shrinkable films provided by the invention is at least 20%, preferably is at least 25%, more preferably at least 30%.
Below with specific embodiment effect of the present invention is described, but protection scope of the present invention is not limited by the following examples.
Following examples and the following formation index of comparative example evaluation and test:
Processing characteristics: refer to and conveniently to bubble that can steady and continuous produce more than 2 hours after the foaming, if satisfy above-mentioned performance, then processing characteristics be good, otherwise processing characteristics is relatively poor;
Outward appearance performance: comprise transparency, anti sag property and gloss performance;
Percent thermal shrinkage: to 10 centimetres of Film sampling 10 cm x, under the condition of 90 ℃ of hot water, place 4 seconds time, launch with cold water cooling back immediately after from hot water, taking out, detect machine direction (MD) and horizontal (TD) size, the two-way size after the thermal contraction and the comparing rate of the two-way size of former state are percent thermal shrinkage.
The anti-intensity that pierces through: the electronics pulling force is counted mark border, Guangzhou and is produced GBH type electronics tensiometer, measuring method is: get film sample and be fixed in the specimen holder device, the specimen holder device is connected with sensor (0-500 newton) perception, when starting instrument, (aciculiform thing below directly puncture film portion is die-cut hemisphere to protrude the aciculiform thing, diameter 6mm) film in the specimen holder device is passed the speed puncture from top to bottom with constant speed (250mm/ minute), the full-scale reading at a moment during the puncture film, industry is more than 50 newton with reference to criterion of acceptability.
BURSTING STRENGTH: get the bag film that makes and with hydraulic press bag film is compressed sealing at a distance heat-sealing mouthful 250mm place, when the sample bag film bursts, read the BURSTING STRENGTH that the reading of hydraulic press is bag film to carrying out inflation in the bag film then, industry with reference to criterion of acceptability greater than 14PSI (14 pounds/square inch).
Raw materials used as follows in following examples and the comparative example:
Raw material 1: strengthen medium density polyethylene (R-MDPE), DOW Chemical provides, and model is ELITE5538G;
Raw material 2: LLDPE (LLDPE), petrochemical industry Co., Ltd of Shanghai match section provides, and model is LL0220KL;
Raw material 3: ethene-1-Butylene copolymer, Japanese Sumitiomo kagaku K.K produces, and model is SMIKASEN CN2011;
Raw material 4: ethane-acetic acid ethyenyl ester, Shanghai Petrochemial Co Ltd, China Petrochemical Corp produces, and model is EVA15/2;
Raw material 5: polyvinylidene chloride, DOW Chemical, article number saran;
Raw material 6: ethylene-vinyl alcohol copolymer, U.S. EVAL produces, and model is
H171B
Raw material 7: metallocene linear-low density polyethylene, Daqing petrochemical, model are HPR18H10AX.
Embodiment 1
Outer raw material: strengthen medium density polyethylene 15 weight %, film-grade LLDPE 20 weight %, ethene-butene-1-copolymer 65%;
The adhesive layer raw material is EVA15/2;
Hot sealing layer raw material: film-grade LLDPE 20 weight %, ethene-butene-1-copolymer 80%;
According to disclosed method in the Chinese patent 951199544, above-mentioned three kinds of raw materials are adopted the base pipe of three layers of three-layer co-extruded method elder generation co-extrusions, inflation film then bubbles the base pipe of coextrusion after by 90 ℃ tepidarium, (vertical on machine direction, MD) apply 3.1 times, in the horizontal (TD) apply 3.6 times biaxial stretch-formed, be cooled to 15 ℃ with air then, cooled three layers of biaxial stretch-formed heat-shrinkable film rolling are risen for further processing usefulness.
The raw material proportioning of embodiment 2-embodiment 10, comparative example 1-3 sees Table 1;
Embodiment 2-embodiment 10, comparative example 1-3 technological parameter see Table 2, other unlisted technological parameter is identical with embodiment 1.
Embodiment 2-embodiment 6
The table 1 embodiment 2-embodiment shared percentages of 7 each raw material (weight)
Continuous table 1 embodiment 8-embodiment 10, the comparative example 1-comparative example shared percentages of 2 each raw material (weight)
Table 2 embodiment 1-embodiment 6 technological parameters and performance evaluation and test result
Continuous table 2 embodiment 7-10, the technological parameter of comparative example 1,2 and performance evaluation and test result
General implication in the table 2 is: performance is poorer slightly than " well ", but can satisfy instructions for use, down together;
The result of contrast table 2 can find, when adding the enhancing medium density polyethylene in outer, can improve the performance of heat-shrinkable film, as raising punctured resistance and BURSTING STRENGTH, and keeps its processability and appearance property; When adding the enhancing medium density polyethylene at skin with in hot sealing layer simultaneously, then further improved the performance of heat shrink films, as punctured resistance and BURSTING STRENGTH have been improved, but ratio is crossed senior general and is caused the processability difficulty as embodiment 8, its punctured resistance and BURSTING STRENGTH are further strengthened when containing the hot sealing layer that strengthens medium density polyethylene and skin and add a certain proportion of metallocene linear-low density polyethylene respectively, but its outward appearance then shows tangible striped.When strengthening, performance need not to adopt electron irradiation also can access the heat shrink films of excellent performance.
Embodiment 11
Outer raw material: strengthen medium density polyethylene 15 weight %, film-grade LLDPE 20 weight %, ethene-butene-1-copolymer 65%;
Outer adhesive layer raw material is EVA15/2;
The oxidation prevention layer raw material is raw material 5, i.e. polyvinylidene chloride;
Interior adhesive layer raw material is EVA15/2;
The hot sealing layer raw material is film-grade LLDPE 20 weight %, ethene-butene-1-copolymer 80%;
Produce multi-laser heat-shrinkable film according to the method identical with embodiment 1, technological parameter sees Table 3, and other technological parameter is identical with embodiment 1.
The raw material proportioning of embodiment 12-14 comparative example 3,4 sees also table 3
Embodiment 11-embodiment 14, comparative example 3-4 technological parameter see Table 4, other unlisted technological parameter is identical with embodiment 1, wherein the multilayer heat shrinkable film produced of comparative example 5 uses electron accelerator irradiation to it after machining.
Table 3 embodiment 12-14, the comparative example shared percentages of 3,4 each raw material (weight)
Table 4 embodiment 11-14, the technological parameter of comparative example 3,4,5 and performance evaluation and test result
The experimental result of contrast table 4 can be found, for five layers of heat shrink films, similar with the situation of three layers of heat shrink films, if when in outer and hot sealing layer, adding the enhancing medium density polyethylene in outer or while, then can obviously improve the performance of heat shrink films, as improved the punctured resistance and the BURSTING STRENGTH of heat shrink films, and obviously improved the processability and the appearance property of heat-shrinkable film, need not to adopt electron irradiation also can access the heat shrink films of excellent performance this moment.In addition,, then use electron accelerator to carry out irradiation and also can produce the heat shrink films of excellent performance (as comparative example 5), but obviously, this kind method has increased cost, has reduced production efficiency if do not add the enhancing medium density polyethylene.
More than heat-shrinkable film provided by the present invention is described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. a multilayer heat shrinkable film is characterized in that, comprises with hot sealing layer, the skin of package contact, is connected described hot sealing layer and outer field intermediate layer;
Described skin comprises the mixture that strengthens medium density polyethylene and be selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more;
Described intermediate layer comprises vinyl-vinyl acetate copolymer;
Described hot sealing layer comprises the mixture that is selected from very low density polyethylene, LLDPE, vinyl-vinyl acetate copolymer, the ethylene ' alpha '-olefin plastomer copolymers one or more.
2. multilayer heat shrinkable film according to claim 1 is characterized in that, the weight content of the enhancing medium density polyethylene in the described skin is 1wt%～50wt%, is preferably 5wt%～35wt%, more preferably 10wt%～20wt%.
3. multilayer heat shrinkable film according to claim 1 is characterized in that, the thickness in described intermediate layer is 2.5 μ m～40 μ m, more preferably 5 μ m～35 μ m, more preferably 10 μ m～30 μ m.
4. multilayer heat shrinkable film according to claim 1 is characterized in that, described intermediate layer comprises the outer adhesive layer that is connected with described skin, the interior adhesive layer that is connected with described hot sealing layer, connects the oxidation prevention layer of described outer adhesive layer and described interior adhesive layer;
Described outer adhesive layer comprises vinyl-vinyl acetate copolymer, and described interior adhesive layer comprises vinyl-vinyl acetate copolymer.
5. multilayer heat shrinkable film according to claim 4 is characterized in that, described oxidation prevention layer comprises one or more the mixture in polyvinylidene chloride, ethylene-vinyl ester copolymer, the polyamide.
6. multilayer heat shrinkable film according to claim 5 is characterized in that, the thickness of described oxidation prevention layer is 2.5 μ m～12 μ m, is preferably 3 μ m～11 μ m, more preferably 5-10 μ m.
7. according to each described multilayer heat shrinkable film of claim 1 to 6, it is characterized in that the thickness of described multilayer heat shrinkable film is 3-130 μ m, be preferably 10-100 μ m, more preferably 30 μ m～100 μ m, more preferably 45 μ m～70 μ m.
8. according to each described multilayer heat shrinkable film of claim 1 to 6, it is characterized in that the thickness of described hot sealing layer is 1-35 μ m, more preferably 5～25 μ m, more preferably 8 μ m～20 μ m.
9. according to each described multilayer heat shrinkable film of claim 1 to 6, it is characterized in that described hot sealing layer also comprises the enhancing medium density polyethylene.
10. multilayer heat shrinkable film according to claim 9 is characterized in that, the content of the enhancing medium density polyethylene in the described hot sealing layer is 1wt%～50wt%, is preferably 5wt%～35wt%, more preferably 10wt%～20wt%.
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| CN2011100092654A CN102126323A (en) | 2011-01-17 | 2011-01-17 | Multilayer thermal shrinkage film |
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| CN2011100092654A CN102126323A (en) | 2011-01-17 | 2011-01-17 | Multilayer thermal shrinkage film |
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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 |
| CN106218159A (en) * | 2016-07-19 | 2016-12-14 | 杭州德雅包装有限公司 | A kind of heat shrink films and utilize the packaging material that this heat shrink films makes |
| CN114771065A (en) * | 2022-04-25 | 2022-07-22 | 深圳市硕美包装材料有限公司 | Polyethylene film and preparation method thereof |
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| CA2022846A1 (en) * | 1989-08-11 | 1991-02-12 | Steven George Friedrich | Cook-in film with very low density polyethylene |
| US5322720A (en) * | 1988-11-17 | 1994-06-21 | W. R. Grace And Co.-Conn. | Multilayer films |
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- 2011-01-17 CN CN2011100092654A patent/CN102126323A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5322720A (en) * | 1988-11-17 | 1994-06-21 | W. R. Grace And Co.-Conn. | Multilayer films |
| CA2022846A1 (en) * | 1989-08-11 | 1991-02-12 | Steven George Friedrich | Cook-in film with very low density polyethylene |
| AU6022490A (en) * | 1989-08-11 | 1991-02-14 | W.R. Grace & Co.-Conn. | Cook-in film with very low density polyethylene |
Cited By (4)
| 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 |
| CN106218159A (en) * | 2016-07-19 | 2016-12-14 | 杭州德雅包装有限公司 | A kind of heat shrink films and utilize the packaging material that this heat shrink films makes |
| CN106218159B (en) * | 2016-07-19 | 2018-05-22 | 杭州德雅包装有限公司 | Packaging material made of a kind of heat shrink films and the heat shrink films |
| CN114771065A (en) * | 2022-04-25 | 2022-07-22 | 深圳市硕美包装材料有限公司 | Polyethylene film and preparation method thereof |
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Application publication date: 20110720 |