CN102173143B - Stewing-resistant composite film and stewing-resistant bag - Google Patents
Stewing-resistant composite film and stewing-resistant bag Download PDFInfo
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- CN102173143B CN102173143B CN 201010602458 CN201010602458A CN102173143B CN 102173143 B CN102173143 B CN 102173143B CN 201010602458 CN201010602458 CN 201010602458 CN 201010602458 A CN201010602458 A CN 201010602458A CN 102173143 B CN102173143 B CN 102173143B
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Abstract
The invention provides a stewing-resistant composite film, comprising a first CPP (chlorinated polypropylene) layer, a PVDC (poly(vinylidene chloride)) layer and a second CPP layer, which are sequentially connected through adhesive. The invention further provides a stewing-resistant bag applying the stewing-resistant composite film as a bottom film. In the three-layer structure of the composite film, the outermost layer and the innermost layer are in a the PP (polypropylene) structure, and the three-layer structure of the composite film is symmetrical, so that all the layers of the composite film can keep the synchronous shrinkage rate during heating, stretching and shrinkage states, and edge curling of the composite film can be avoided after stretching. In addition, as CPP has higher water resistance and PVDC has higher barrier property against water and oxygen, the stewing-resistant composite film has excellent barrier performance; and experiments prove that the water vapor transmission rate of the stewing-resistant composite film is less than 5g/(m2.24h), and the oxygen transmission rate is less than 20cm<3>/(m2.24h.0.1MPa).
Description
Technical field
The present invention relates to the packaging material field, particularly a kind of composite membrane of anti-boiling the and anti-retort pouch.
Background technology
Anti-retort pouch claims foods packed in carton containers again, and referring to can packaged food and can stand the laminated film of 121 ℃ of Steam Heating sterilization processing.At present, be mainly used in packing tinned food at China's retort pouch, can also be used for packaged beverage in countries such as Japan and West Europe.
With respect to traditional metal Can container, anti-retort pouch has following advantage: at first, the raw material ratio metallic plate price of anti-retort pouch is low, and its production technology and process equipment are also comparatively simple, and therefore the manufacturing cost of anti-retort pouch is lower; Secondly, anti-retort pouch is thinner, can reach sterilising temp fast, and this has not only reduced the sterilization power consumption, can also the original taste of preservation inner packing food as much as possible; At last, the retort pouch lighter weight is convenient to the consumer and is carried.Therefore, in recent years, the market of anti-retort pouch constantly enlarged, even was expected to substitute traditional metal packing material in some fields.
The film of anti-boiling that anti-retort pouch uses is different from general barrier film, and it needs that not only the oxygen G﹠W is had extremely low transmitance, also needs to satisfy following 3 requirements:
1., have digestion resistant, vicat softening point temperature need be higher than sterilising temp, is that it satisfies sterilization adaptability;
2., have heat-shrinkable, shrink under the high temperature, guarantee the applying degree of packaging bag and packed article, reduce the interior gas remnants of bag;
3., have flatness preferably, not only be convenient to heat-sealing, for the commodity that needs are stood and put, smooth bottom surface is the basis that guarantees that packaging bag is steadily stood.
Existing retort packaging film mainly comprises aluminum-plastic composite membrane and the transparent composite membrane of anti-the boiling, because aluminum-plastic composite membrane does not have the transparency and can not carry out microwave, therefore, the transparent film of anti-the boiling becomes industry personnel's main research object gradually.The structure of the existing transparent composite membrane of anti-the boiling is generally polyamide/cast polypropylene or polyester/cast polypropylene, though the composite membrane of anti-boiling transparency of this kind structure is very high, but its barrier still remains to be improved, and because this kind composite membrane need heat drawing and forming, add film after the hot-stretch because the percent thermal shrinkage difference of each layer, crimping easily takes place in the composite membrane after the stretching, causes the flatness of anti-retort pouch lower.
Therefore, need provide a kind of high barrier, and be difficult for the composite membrane of anti-boiling of crimping after stretching.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of high barrier, and the back that stretches is difficult for taking place the composite membrane of anti-boiling of crimping.
In view of this, the invention provides a kind of composite membrane of anti-the boiling, comprise successively: the CPP layer, PVDC layer and the 2nd CPP layer that connect successively by adhesive.
Preferably, a described CPP layer comprises successively: hot sealing layer, intermediate layer and with the contacted corona layer of described PVDC layer; Described hot sealing layer, intermediate layer and corona layer are binary copolymerization PP layer.
Preferably, the described binary copolymerization PP copolymer that is propylene and ethene.
Preferably, described hot sealing layer comprises: the slipping agent of the opening agent of 0.8wt%～1.5wt%, the rheological agent of 0.08wt%～0.12wt%, 0.3wt%～0.5wt% and the binary copolymerization PP of surplus.
Preferably, described corona layer comprises: the binary copolymerization PP of the rheological agent of 0.08wt%～0.12wt%, the slipping agent of 0.3wt%～0.5wt% and surplus.
Preferably, described the 2nd CPP layer comprises successively: with the contacted corona layer of described PVDC layer, intermediate layer and surface layer; Described intermediate layer and corona layer are binary copolymerization PP layer, and described surface layer is the homopolymerization PP layer.
Preferably, described corona layer comprises: the binary copolymerization PP of the rheological agent of 0.08wt%～0.12wt%, the slipping agent of 0.3wt%～0.5wt% and surplus.
Accordingly, the present invention also provides a kind of anti-retort pouch, comprises the above-mentioned composite membrane of anti-boiling the and adventitia, and heat-sealing is connected the described composite membrane of anti-the boiling with adventitia;
Described adventitia comprises: link to each other successively by adhesive with contacted the 3rd CPP layer of the described composite membrane of anti-boiling the, PVDC layer and BOPP layer.
Preferably, described the 3rd CPP layer comprises successively: with the contacted corona layer of described PVDC layer, intermediate layer and hot sealing layer, described hot sealing layer, intermediate layer and corona layer are binary copolymerization PP layer.
The composite membrane of anti-boiling the provided by the invention comprises a CPP layer, PVDC layer and the 2nd CPP layer successively.With respect to the existing composite membrane of anti-the boiling, its outermost layer and innermost layer in the laminated film three-decker all adopts the PP structure, the three-decker that is composite membrane adopts symmetrical expression, make composite membrane all keep synchronous shrinkage factor at heating, stretching and each layer of contraction state thus, avoided composite membrane stretching back that crimping takes place.In addition, because CPP has higher water-resistance, the water of PVDC and oxygen all have higher barrier, make the above-mentioned composite membrane of anti-the boiling have excellent barrier property, experiment showed, that the steam transmitance of the composite membrane of anti-boiling the provided by the invention is less than 5g/ (m
224h), OTR oxygen transmission rate is less than 20cm
3/ (m
224h0.1MPa).
The specific embodiment
In order further to understand the present invention, be described below in conjunction with the preferred embodiment of the invention of embodiment, 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 embodiment of the invention discloses a kind of composite membrane of anti-the boiling, it comprises a CPP layer, PVDC layer and the 2nd CPP layer that connects successively by adhesive.
Because the composite membrane of anti-the boiling needs to carry out stretch processing in the process that packing material is packed, stretch processing rear film inside has stress-retained, part can take place and shrink in composite membrane under the internal stress effect, crimping easily takes place because shrinkage factor is different laminated film each layer in contraction process.Crimping takes place in order to prevent composite membrane in the present invention in contraction process, outermost layer in the laminated film three-decker and innermost layer all adopt the PP structure, the three-decker that is composite membrane adopts symmetrical expression, make composite membrane all keep synchronous shrinkage factor at heating, stretching and each layer of contraction state thus, avoided composite membrane stretching back that crimping takes place.
Select for use the PP structural reason to be at laminated film outermost layer and innermost layer: PP not only has good moisture resistance and water-resistance, and boiling resistance is good, and its vicat softening point temperature is higher than 121 ℃, satisfies the sterilization requirement.
The PP film can be divided into OPP film and CPP film by its production technology, and wherein the OPP film is the oriented polypropylene (OPP) film, and the CPP film is the polypropylene film of producing by the curtain coating extrusion process, claims un-stretched polypropylene film again.In the composite membrane of anti-boiling of the three-decker that the present invention adopts, all adopting the CPP film at its outermost layer and innermost layer is to consider that CPP is easier to drawing and forming, and it is compound through being easy to other material after sided corona treatment.
Though the CPP film has above-mentioned advantage, its barrier to gas is relatively poor, and percent thermal shrinkage is also lower.For this reason, the present invention selects PVDC for use in the intermediate layer of three-decker.PVDC (poly vinylidene chloride) is the homopolymers of vinylidene chloride, and its transmitance to oxygen is extremely low, less than 50cm3/m2.24h.atm, can effectively prevent food generation oxidation deterioration thus; The steam transmitance of PVDC is also lower, less than 5g/m
2.24h, can effectively prevent the inner package moisture loss; The hear resistance of PVDC is higher, the highest can be anti-130 ℃, satisfy the requirement of sterilization processing; The heat-shrinkable of PVDC is better, and percent thermal shrinkage at high temperature is higher, is close on the packing material in order to guarantee film, reduces gas residue in the packaging bag, extends the shelf life.
In the composite membrane of anti-boiling the provided by the invention, a CPP layer preferably adopts following structure: hot sealing layer/intermediate layer/corona layer, wherein hot sealing layer, intermediate layer and corona layer all are to be made by binary copolymerization PP.The corona layer contacts with the PVDC layer in the said structure, and alleged corona layer refers to carry out in the composite membrane one deck at the corona surface place of sided corona treatment among the present invention, the CPP film is carried out sided corona treatment after, the degree of polarization of corona surface improves, and is easy to carry out compound with the PVDC layer.
Binary copolymerization PP has good digestion resistant and heat sealability, and it namely has very high heat seal strength at 132 ℃, and pliability is good, gives the mechanical property that composite membrane is easy to drawing and forming, and binary copolymerization PP preferably adopts the copolymer of propylene and ethene.
One deck that the 2nd CPP layer is and heating plate is directly fitted, with respect to a CPP layer, it need have more excellent heat resisting in order to satisfy the processing needs.The present invention preferably uses the 2nd CPP layer of following structure: corona layer/intermediate layer/surface layer, and wherein make by the poly-PP of binary copolymerization in corona layer and intermediate layer, and surface layer is made by homopolymerization PP.In the heating drawing process, surface layer is one deck direct and that heating plate is fitted, and its heat resistance is determining whole composite membrane to the adaptability of process equipment, and the hear resistance of homopolymerization PP is best in the PP resin, and therefore, surface layer is selected homopolymerization PP for use.The corona layer is and the contacted one deck of PVDC layer that corona layer and intermediate layer select for use binary copolymerization PP to be used for improving the tensile property of composite membrane.
Because composite membrane needs to contact away film with bag commentaries on classics equipment in process of manufacture, therefore, the present invention preferably adds slipping agent in the corona layer of a CPP layer corona layer and hot sealing layer and the 2nd CPP layer and hot sealing layer, in order to increase the smoothness on composite membrane surface, reduce the friction between itself and the equipment, the content of slipping agent is 0.3wt%～0.5wt%.
In order to improve the transparency of film, the rheological agent that the corona layer of the one CPP layer corona layer and hot sealing layer and the 2nd CPP layer and hot sealing layer also preferably include 0.08wt%～0.12wt%, the adding of rheological agent can improve the contact-making surface friction between polymer melt and extruder barrel and the head metal surface, reduce to extrude and add man-hour because of broken orange peel, the shark skin phenomenon that occurs of melt, avoid the generation of head retentate, improve apparent mass, increase the light of film, reduce mist degree and crystalline substance and count.
Simultaneously, be easier to rolling in order to make composite membrane, the present invention also preferably adds the opening agent at the hot sealing layer of a CPP layer and the surface layer of the 2nd CPP layer, and the content of opening agent is 0.8wt%～1.5wt%.
Above-mentioned CPP film preferably is prepared as follows:
The resin raw material of each layer of composite membrane 210 ℃～255 ℃ co-extrusion modlings, is comprised the hot melt film of skin, intermediate layer and internal layer successively;
With described hot melt film curtain coating cooling and shaping;
Curtain coating cooling and shaping rear film need be carried out sided corona treatment with the compound one side face of PVDC layer at it, obtain the CPP film after the sided corona treatment.
The above-mentioned composite membrane of anti-boiling the provided by the invention preferably is prepared as follows:
Behind the PVDC layer coated on both sides type of anti-boiling adhesive, carry out solvent-free compound respectively at a CPP layer and the 2nd CPP layer.Solvent-free compound be the solventless adhesive that adopts 100% solid, the method that on solvent-free composite machine two kinds of base materials is combined with each other claims that again response type is compound.Adopt the solvent-free compound volatile solvent discharging of not only not having in process of production, reduce environmental pollution, and also make and meet the hygienic requirements of modern food and medicine packing by no solvent residue in the composite membrane after compound.The double component solvent-free glue of anti-boiling the 7735 and 6088 that the adhesive that the present invention uses preferably selects for use Henkel KGaA company to produce, it is to the CPP film and the PVDC film all has higher adhesive force and boiling resistance can be good.
In addition, the present invention also provides a kind of anti-retort pouch, and it comprises adventitia and counterdie, and counterdie adopts the above-mentioned composite membrane of anti-the boiling, and adventitia comprises: by BOPP layer, PVDC layer and the 3rd CPP layer that adhesive links to each other successively, wherein, the 3rd CPP layer is connected with the counterdie heat-sealing.
Though adventitia does not need to add hot-stretch, but it needs in sterilization process through thermophilic digestion, composite membrane expanded by heating during thermophilic digestion, for the composite membrane crimping that prevents that each layer of adventitia from causing because of the expansion rate difference, the adventitia of anti-retort pouch the provided by the invention also adopts symmetrical structure, and the outermost layer of adventitia and innermost layer all adopt the PP structure.Because the surface layer of adventitia is the one side that needs the carrying printing, considers that from the printing aspect printing of BOPP should adapt to and be better than CPP, therefore selects for use the surface layer of adventitia to select BOPP for use.
The 3rd CPP layer is preferably identical with a CPP layer structure in the counterdie, is convenient to carry out compound with PVDC.
Use the packaging process of above-mentioned anti-retort pouch to be: counterdie is placed the moulding heater plate surface, counterdie is heated, the heating back uses mould that counterdie is carried out the vacuum drawing and forming, counterdie forms tolerant and the heat-sealing portion that holds connection with wrapping of piece, in tolerant of counterdie, add packed article, then itself and adventitia are sealed in heat-sealing portion.
Because counterdie and the adventitia of above-mentioned retort packaging bag all have higher barrier, and counterdie is difficult for crimping after adding hot-stretch, therefore can be widely used in the packing of meat products, bean product and beverage.
In order further to understand the present invention, below in conjunction with embodiment the composite membrane of anti-boiling the provided by the invention and anti-retort pouch are described.Binary copolymerization polypropylene in following examples provides by Korea S Samsung company, and trade names are RF402; Homopolymerization PP is provided by Kingsoft, Shanghai petro-chemical corporation, trade mark FC801; Rheological agent provides by French POLYTECHS company, and trade names are AIDPPF4; The opening agent provides by French POLYTECHS company, and trade names are ABPP10S; Slipping agent provides by the superior plastics in Jiangyin Co., Ltd, and trade names are SE07PP.
Embodiment 1
1, preparation the one CPP film
Add hot sealing layer resin raw material, intermediate layer resin raw material and corona layer resin raw material respectively in three barrels of coextrusion machine, each resin raw material prescription is listed in table 1.
Raw material in three barrels carried out coextrusion is laggard goes into curtain coating station cooling and shaping, three barrel zone temperatures of extruder are set are one section: 220 ℃, two sections: 255 ℃, three sections: 250 ℃, die head temperature: 240 ℃; It is 15 ℃ that the casting roller roll surface temperature is set in the curtain coating operation.Air knife upper-lower position: 90%; Air knife speed: 55%; Vacuum tank wind speed: 30%; Air knife horizontal level: 45%; Air knife pressure: 5mbar; Vacuum tank pressure: 1mbar.
Film after the curtain coating typing is carried out sided corona treatment in its corona aspect, and it is that 8KW, corona roller pressure are 3bar that sided corona treatment power is set, and obtains a CPP film after the sided corona treatment.
2, preparation the 2nd CPP film
Add hot sealing layer resin raw material, intermediate layer resin raw material and surface layer resin raw material respectively in three barrels of coextrusion machine, each resin raw material prescription is listed in table 2.
Raw material in three barrels carried out coextrusion is laggard goes into curtain coating station cooling and shaping, three barrel zone temperatures of extruder are set are one section: 230 ℃, two sections: 255 ℃, three sections: 250 ℃, die head temperature: 240 ℃; It is 20 ℃ that the casting roller roll surface temperature is set in the curtain coating operation.Air knife upper-lower position: 90%; Air knife speed: 55%; Vacuum tank wind speed: 30%; Air knife horizontal level: 45%; Air knife pressure: 45mbar; Vacuum tank pressure: 1.5mbar.
Film after the curtain coating typing is carried out sided corona treatment in its corona aspect, and it is that 8KW, corona roller pressure are 3bar that sided corona treatment power is set, and obtains the 2nd CPP film after the sided corona treatment.
3, compound
The CPP film that step 1 is made, the 2nd CPP film that PVDC film and step 2 make imports solvent-free composite machine and carries out compound, the two sides of PVDC film is mutually compound with the CPP film of the second corona layer respectively at the corona layer of a CPP film in the recombination process, the adhesive that uses is the double component solvent-free glue of anti-boiling the 7735 that Henkel KGaA company produces, and obtains the composite membrane of anti-the boiling after compound.
Embodiment 2
1, preparation the one CPP film
The preparation method of present embodiment the one CPP film is identical with enforcement 1, and composition of raw materials is listed in table 1.
2, preparation the 2nd CPP film
The preparation method of present embodiment the 2nd CPP film is identical with enforcement 1, and composition of raw materials is listed in table 3.
3, compound.
The present embodiment compound working procedure is identical with embodiment 1.
Embodiment 3
1, preparation the one CPP film
The preparation method of present embodiment the one CPP film is identical with enforcement 1, and composition of raw materials is listed in table 1.
2, preparation the 2nd CPP film
The preparation method of present embodiment the 2nd CPP film is identical with enforcement 1, and composition of raw materials is listed in table 3.
3, compound
The present embodiment compound working procedure is identical with embodiment 1.
Embodiment 4
1, preparation the 3rd CPP film
The preparation method of present embodiment the 3rd CPP film and composition of raw materials are all identical with embodiment 1 a CPP film.
2, compound
Step 1 is made the 3rd CPP film, PVDC film and BOPP film to import in the solvent-free composite machine compound, the two sides of PVDC film is consistent respectively at corona layer and the BOPP film of the 3rd CPP film in the recombination process, the adhesive that uses is the adhesive that the uses double component solvent-free glue of anti-boiling the 7735 as the production of Henkel KGaA company, obtains adventitia after compound.
Embodiment 5
With the composite membrane of anti-boiling of embodiment 1 preparation as counterdie, the 2nd CPP layer of counterdie is fitted in the moulding heating plate, counterdie is heated, it is 105 ℃ that heating-up temperature is set, the heating back uses mould that counterdie is carried out the vacuum drawing and forming, and it is 0.04MPa that vacuum is set, and counterdie forms tolerant and the heat-sealing portion that holds connection with wrapping of piece behind the vacuum drawing and forming, in tolerant of counterdie, add packed article, then itself and adventitias of implementing 4 preparations are sealed in heat-sealing portion.
Embodiment 6
The difference of present embodiment and embodiment 2 is that it is that the composite membrane of anti-boiling for preparing with embodiment 2 is counterdie, and all the other operations are all identical with embodiment 5.
Embodiment 7
The difference of present embodiment and embodiment 3 is that it is that the composite membrane of anti-boiling for preparing with embodiment 3 is counterdie, and all the other operations are all identical with embodiment 5.
Comparative example 1
1, preparation counterdie and adventitia
The one CPP film and the PA film of embodiment 1 preparation are imported in the solvent-free composite machine, PA is mutually compound with the corona layer of a CPP film in the recombination process, the adhesive that uses is the double component solvent-free glue of anti-boiling the 7735 that Henkel KGaA company produces, and obtains the composite membrane of anti-the boiling after compound.
2, the composite membrane of anti-boiling that makes with step 1 is counterdie and adventitia, the CPP layer of counterdie is fitted in the moulding heating plate, counterdie is heated, it is 115 ℃ that heating-up temperature is set, the heating back uses mould that counterdie is carried out the vacuum drawing and forming, and it is 0.04MPa that vacuum is set, and counterdie forms tolerant and the heat-sealing portion that holds connection with wrapping of piece behind the vacuum drawing and forming, in tolerant of counterdie, add packed article, then itself and adventitia are sealed in heat-sealing portion.
Table 1 is implemented the prescription of a CPP film among the 1-embodiment 3
Table 2 is implemented the prescription of the 2nd CPP film among the 1-embodiment 3
The anti-retort pouch anti-retort pouch that embodiment 5～7 prepares behind 121 ℃ of high temperature sterilization 20min of embodiment 5～7 and comparative example 1 preparation is the generation crimping, the anti-retort pouch generation crimping of comparative example 1 preparation.
The film of anti-boiling of test implementation example 1～3 and comparative example 1 preparation is to the barrier of water and oxygen, and test result is listed in table 3.
The film of anti-boiling barrier property test result of table 3 embodiment 1-3 and comparative example 1
By The above results as can be known, by the anti-retort pouch of anti-boiling film preparation provided by the invention, oxygen and steam are all had higher barrier, and crimping can not take place in anti-retort pouch in preparation and sterilization process.
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.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments herein.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. the composite membrane of anti-the boiling is characterized in that, comprising: the CPP layer, PVDC layer and the 2nd CPP layer that connect successively by adhesive;
Described the 2nd CPP layer comprises successively: with the contacted corona layer of described PVDC layer, intermediate layer and surface layer; Described intermediate layer and corona layer are binary copolymerization PP layer, and described surface layer is the homopolymerization PP layer.
2. the composite membrane of anti-boiling the according to claim 1 is characterized in that, a described CPP layer comprises successively: hot sealing layer, intermediate layer and with the contacted corona layer of described PVDC layer; Described hot sealing layer, intermediate layer and corona layer are binary copolymerization PP layer.
3. the composite membrane of anti-boiling the according to claim 2 is characterized in that, described binary copolymerization PP is the copolymer of propylene and ethene.
4. the composite membrane of anti-boiling the according to claim 2 is characterized in that, described hot sealing layer comprises: the slipping agent of the opening agent of 0.8wt%～1.5wt%, the rheological agent of 0.08wt%～0.12wt%, 0.3wt%～0.5wt% and the binary copolymerization PP of surplus.
5. the composite membrane of anti-boiling the according to claim 2 is characterized in that, described corona layer comprises: the binary copolymerization PP of the rheological agent of 0.08wt%～0.12wt%, the slipping agent of 0.3wt%～0.5wt% and surplus.
6. the composite membrane of anti-boiling the according to claim 1 is characterized in that, described surface layer comprises: the homopolymerization PP of the opening agent of 0.8wt%～1.5wt%, the rheological agent of 0.08wt%～0.12wt%, 0.3wt%～0.5wt% slipping agent and surplus.
7. the composite membrane of anti-boiling the according to claim 1 is characterized in that, described corona layer comprises: the binary copolymerization PP of the rheological agent of 0.08wt%～0.12wt%, the slipping agent of 0.3wt%～0.5wt% and surplus.
8. an anti-retort pouch is characterized in that, comprising: as any described composite membrane of anti-boiling of claim 1～7 and adventitia, heat-sealing is connected the described composite membrane of anti-the boiling with adventitia;
Described adventitia comprises: link to each other successively by adhesive with contacted the 3rd CPP layer of the described composite membrane of anti-boiling the, PVDC layer and BOPP layer.
9. anti-retort pouch according to claim 8 is characterized in that, described the 3rd CPP layer comprises successively: with the contacted corona layer of described PVDC layer, intermediate layer and hot sealing layer, described hot sealing layer, intermediate layer and corona layer are binary copolymerization PP layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010602458 CN102173143B (en) | 2010-12-23 | 2010-12-23 | Stewing-resistant composite film and stewing-resistant bag |
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| CN 201010602458 CN102173143B (en) | 2010-12-23 | 2010-12-23 | Stewing-resistant composite film and stewing-resistant bag |
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| CN102173143B true CN102173143B (en) | 2013-09-11 |
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| KR101251165B1 (en) * | 2011-09-20 | 2013-04-04 | 씨제이제일제당 (주) | Package |
| CN107618240A (en) * | 2017-09-26 | 2018-01-23 | 沈阳日新塑料包装制品有限公司 | Environment-friendly novel high-barrier resistance to 121oThe fit stretching composite membrane of C thermophilic digestions |
| CN107599576B (en) * | 2017-09-28 | 2019-11-08 | 浙江大东南股份有限公司 | A kind of lithium ion battery Soft Roll film inner layer material and preparation method thereof |
| CN108146023A (en) * | 2017-12-01 | 2018-06-12 | 河南中塑新材有限公司 | A kind of thermophilic digestion packaging bag manufacturing method of no ink imaging |
| CN108790004A (en) * | 2018-05-28 | 2018-11-13 | 永新股份（黄山）包装有限公司 | A kind of resistance to boiling suction nozzle and its production method |
| CN116215031B (en) * | 2022-12-16 | 2023-09-26 | 青岛振昌工贸有限公司 | High-temperature-resistant steaming and boiling composite film, preparation method thereof and high-temperature-resistant steaming and boiling bag |
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| JPH06312452A (en) * | 1993-04-30 | 1994-11-08 | Asahi Chem Ind Co Ltd | Packing film for normal temperature delivery food and packing container using the same |
| CN2559598Y (en) * | 2002-08-14 | 2003-07-09 | 樊书德 | PVDC laminated composite high-temperature resistant steam cooking food packing film |
| CN2576468Y (en) * | 2002-11-04 | 2003-10-01 | 上海紫藤包装材料有限公司 | MCP three-layer co-extrusion non-stretched polypropylene film |
| CN100500431C (en) * | 2003-04-10 | 2009-06-17 | 郑州宝蓝包装技术有限公司 | PVDC laminated composite high-temperature-resistant steamed and boiled food packaging film and its preparation method |
| CN100509383C (en) * | 2006-07-19 | 2009-07-08 | 唐新国 | Cast polypropylene film with low heat-sealing temperature and high heat-sealing strength |
| CN201980564U (en) * | 2010-12-23 | 2011-09-21 | 黄山永新股份有限公司 | Composite film with high barrier property and boiling resistance, and bag with boiling resistance |
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