CN102555391A - Polypropylene film - Google Patents
Polypropylene film Download PDFInfo
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- CN102555391A CN102555391A CN2011104192774A CN201110419277A CN102555391A CN 102555391 A CN102555391 A CN 102555391A CN 2011104192774 A CN2011104192774 A CN 2011104192774A CN 201110419277 A CN201110419277 A CN 201110419277A CN 102555391 A CN102555391 A CN 102555391A
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Abstract
The invention discloses a polypropylene film which is not stretched after high temperature cooking. The polypropylene film has a three-layer structure, including an outer surface layer, a middle layer and a heat sealing layer. Main materials of the outer surface layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent; main materials of the middle layer are graft copolymer polypropylene or random copolymer polypropylene or the mixture of the two, polyolefin elastomer or metallocene polyethylene; main materials of the heat sealing layer are graft copolymer polypropylene, polyolefin elastomer or metallocene polyethylene and bonding agent. The film can be cooked for 30 minutes at the temperature of 121-135 DEG C without stretching; the film has good tensile strength, excellent anti-impact performance and good heat sealing strength; and the heat resistance of the film is good, and the film cannot deform after cooking and is good in dimension stability.
Description
Technical field
A kind of polypropylene film of the present invention relates in particular to a kind of thermophilic digestion un-stretched polypropylene film.
Background technology
The thermophilic digestion sterilization is a kind of effectively method for disinfection, and it is meant the sterilization processing under the high-temperature high-pressure state more than 100 degrees centigrade.Compare with xeothermic formula sterilization, the wet-hot type bactericidal effect is better.Pasteurization had equal effect in 30 minutes with hot water or wet sterilization under 30 minutes and 100 ℃ in 160 ℃ air.If prolong heat time heating time, food will embrittlement, also some bacterium also can survive at 100 ℃, so will use the temperature sterilization more than 100 ℃.Killing the gemma bacterium at 100 ℃ needs 400 minutes, if with temperature bring up to 120 ℃ only need 4 minutes just much of that.Therefore sterilization temperature is high more, and sterilizing time can be short more, just can reduce the embrittlement rate of food, the nutritional labeling of retaining food product.
The Botulinus bacterium is a kind of hear resistance bacterium of poisoning by food of causing, and fatal rate is high, it is generally acknowledged, will be killed in 4 minutes 120 ℃ of heating.This standard is generally considered to be the minimum bactericidal condition of cooking food, but in order to guarantee food security, the general condition of more strictness that adopts is done sterilization processing.Plastics package and plastic packet product shared share on market is increasing; Particularly composite plastic flexible package; Fields such as food, medicine, chemical industry have been widely used in; Wherein maximum with the packaging for foodstuff proportion again, such as beverage packing, quick-frozen food packing, cooking food packing, fast food packing etc., these products all bring great convenience to people's life.
Polypropylene film is because its physical stability, mechanical strength, air-tightness are better, and transparency and glossiness are higher, extensively are used to the packaging for foodstuff field.But the polypropylene film heatproof and the shock resistance that are used for boiling packing at present are relatively poor, behind thermophilic digestion frangible pouch, variable color, distortion, absciss layer, ooze phenomenon such as dew.
Summary of the invention
For defective and the deficiency that overcomes prior art, the present invention provides a kind of digestion resistant un-stretched polypropylene film, and this film can not stretch 121-135 ℃ of following boiling in 30 minutes.
Polypropylene film provided by the invention has three-decker, is respectively: extexine/intermediate layer/hot sealing layer.
As optimal technical scheme, the bed thickness ratio of described three-decker is respectively: extexine 5%-60%, intermediate layer 10%-80%, hot sealing layer 5%-60%.
As optimal technical scheme, the main material of described extexine is disconnected COPP, polyolefin elastomer or metallocene PE and an antitack agent of embedding; Preferably, the main material in intermediate layer is the disconnected COPP of embedding or atactic copolymerized polypropene or the blend of the two, polyolefin elastomer or metallocene PE; Preferably, the main material of hot sealing layer is disconnected COPP, polyolefin elastomer or metallocene PE and an antitack agent of embedding.Because extexine need print or compound, therefore need carry out corona treatment or plasma treatment, with the adhesion of enhancing and printing ink, adhesive to its surface.
As optimal technical scheme, described extexine contains the disconnected COPP of embedding of 95～100wt% and the antitack agent of 0～5%wt; Preferably, the metallocene PE of the intermediate layer disconnected COPP of embedding that contains 65～85wt% and 15～35wt% or contain 60～80wt% atactic copolymerized polypropene and 40～20wt% polyolefin elastic not; Preferably, hot sealing layer contains the disconnected COPP of embedding of 95～98wt% and the antitack agent of 2～5wt%.
The disconnected COPP of embedding by single propylene monomer be polymerized, degree of crystallinity is higher, mechanical strength and hear resistance are good, and higher impact strength is arranged.The random copolymerization propylene is that comonomer molecule irregularly is inserted in the middle of the propylene molecules; Destroyed polyacrylic continuous chain structure; Having hindered the crystallization of polymer molecule arranges; Thereby reduced its degree of crystallinity, atactic copolymerized polypropene compare with homopolymers have lower fusing point, the higher transparency and high-temperature creep resistance.Polyolefin elastomer is a kind of thermoplastic elastomer (TPE) that narrow relative molecular mass distributes and uniform short-chain branch distributes that has, and its performance is very outstanding, has excellent properties such as ageing-resistant, anti-ozone, resistant to chemical media.Metallocene PE is a kind of novel thermoplastic, is the most important technical progress of the polyolefin industry nineties, is an important innovation after linear low density of polyethylene LLDPE production technology.Because it is to use metallocene is the polyethylene that polymerization catalyst is produced; Therefore; The PE that on performance, is polymerized with traditional Ziegler-Natta catalyst has different significantly, and it can strengthen the processing characteristics of extruding of film in the film performance that keeps excellence.
As optimal technical scheme, adopt three-layer co-extruded The tape casting production.
Multi-layer co-extruded as three-layer co-extruded casting films extruding technology is that a kind of different plastics with two or more utilize the compound die head of extruder through a multithread road more than 2 or 2; Converge the laminated film of producing sandwich construction, and pass through the technology of chilling roller moulding.Multi-layer co-extruded casting films extruding technology also is the production technology of extruding of traditional production film.Adopt this method can produce the film of various different materials; And has very high machining accuracy; Especially when processing hypocrystalline thermoplastic, this processing method can be brought into play the performance of machined material fully, can keep best dimensional accuracy simultaneously again.Prepared casting films has the good optical property and the thickness uniformity, and owing to adopt the chilling roller can obtain very high speed of production, and improve the morphosis of film.The film that this method makes is compared with other films (like blown film), and its advantage is that speed of production is fast, and output is high, helps producing in enormous quantities; The thickness control accuracy of product is higher, and thickness evenness is better; The transparency and glossiness are all good; Each is excellent to balance quality.
As optimal technical scheme, described polypropylene film does not stretch at 121～135 ℃ of following boiling 30min.The characteristic that polypropylene film provided by the present invention does not stretch at 121～135 ℃ of following boiling 30min; Make the food that utilizes the packing of product of the present invention both can stand heat packing not broken bag, variable color, distortion, absciss layer simultaneously again, ooze dew through the effective killing bacteria of heat.
As optimal technical scheme, described polypropylene film thickness is 30-150 μ m, is preferably 50-100 μ m.
One of the object of the invention also is to provide a kind of purposes of polypropylene film, needing can be used for the packaging for foodstuff of cooking disinfection.
Thermophilic digestion un-stretched polypropylene film characteristics provided by the present invention are:
1, this film can be under the 121-135 degrees celsius boiling 30 minutes;
2, film stretching intensity is good, excellent shock resistance, and heat seal strength is good;
3, the film heat resistance is good, and the boiling rear film is indeformable, and dimensional stability is good;
The specific embodiment:
For ease of understanding the present invention, it is following that the present invention enumerates embodiment.Those skilled in the art should understand, and said embodiment only is used for helping to understand the present invention, should not be regarded as concrete restriction of the present invention.
The main raw material(s) that the present invention relates to is following:
1# FS812 Mitsui, the embedding COPP that breaks
Do not contain antiplastering aid and slipping agent.TM(melt?point)＝163℃，MI＝3.5
2# B130R, Korea S Samsung Dao Daer, atactic copolymerized polypropene
Do not contain antiplastering aid and slipping agent.TM(melt?point)＝152℃，MI＝4.0
3# MF257, Mitsui, metallocene polypropylene
Do not contain antiplastering aid and slipping agent.TM(melt?point)＝115℃，MI＝10.0
4# BC918CF, Borealis, atactic copolymerized polypropene
Do not contain antiplastering aid and slipping agent.TM(melt?point)＝166℃，MI＝3.0
5# EG8200, LG-DOW, polyolefin elastomer
Do not contain antiplastering aid and slipping agent.TM(melt?point)＝59℃，MI＝5.0
6# EAZ-10, Mitsui, synthetic silica
Active ingredient accounts for 10%
7# CHAB 10, peace color matching, synthetic silica
Active ingredient accounts for 10%.
Embodiment one
Extexine: 98%1#+2%6# accounts for 20% of bed thickness ratio,
Intermediate layer: 80%1#+20%3# accounts for 60% of bed thickness ratio
Hot sealing layer: 98%1#+2%6# accounts for 20% of bed thickness ratio.
The polypropylene film that makes according to present embodiment boiling 30 minutes under the 121-135 degrees celsius stretches.
Embodiment two
Extexine: 100%1# accounts for 20% of bed thickness ratio,
Intermediate layer: 80%2# or 4#+20%5# account for 60% of bed thickness ratio
Hot sealing layer: 98%1#+2%7# accounts for 20% of bed thickness ratio.
The polypropylene film that makes according to present embodiment boiling 30 minutes under the 121-135 degrees celsius stretches.
Embodiment three
Extexine: 95%1#+5%6# accounts for 10% of bed thickness ratio,
Intermediate layer: 65%1#+35%3# accounts for 80% of bed thickness ratio
Hot sealing layer: 95%1#+5%6# accounts for 10% of bed thickness ratio.
The polypropylene film that makes according to present embodiment boiling 30 minutes under the 121-135 degrees celsius stretches.
Embodiment four
Extexine: 97%1#+3%6# accounts for 60% of bed thickness ratio,
Intermediate layer: 85%5#+15%3# accounts for 10% of bed thickness ratio
Hot sealing layer: 96%3#+4%6# accounts for 30% of bed thickness ratio.
The polypropylene film that makes according to present embodiment boiling 30 minutes under the 121-135 degrees celsius stretches.
Embodiment five
Extexine: 95%3#+5%6# accounts for 5% of bed thickness ratio,
Intermediate layer: 65%2#+35%3# accounts for 35% of bed thickness ratio
Hot sealing layer: 95%3#+5%6# accounts for 60% of bed thickness ratio.
The polypropylene film that makes according to present embodiment boiling 30 minutes under the 121-135 degrees celsius stretches.
According to actual requirement, the material rate of extexine, intermediate layer, hot sealing layer and bed thickness ratio can adjust.
Applicant's statement, the present invention explains detailed process flow of the present invention through said embodiment, but the present invention is not limited to said detailed process flow, does not mean that promptly the present invention must rely on said detailed process flow and could implement.The person of ordinary skill in the field should understand, and under the situation of not paying any performing creative labour, to any improvement of the present invention, modification, equivalence replacement, all drops within protection scope of the present invention and the open scope.
Claims (8)
1. a polypropylene film is characterized in that having three-decker, is respectively: extexine/intermediate layer/hot sealing layer.
2. polypropylene film as claimed in claim 1 is characterized in that, the bed thickness ratio of described three-decker is respectively: extexine 5%-60%, intermediate layer 10%-80%, hot sealing layer 5%-60%.
3. according to claim 1 or claim 2 polypropylene film is characterized in that, the main material of described extexine is disconnected COPP, polyolefin elastomer or metallocene PE and an antitack agent of embedding;
Preferably, the main material in intermediate layer is the disconnected COPP of embedding or atactic copolymerized polypropene or the blend of the two, polyolefin elastomer or metallocene PE;
Preferably, the main material of hot sealing layer is disconnected COPP, polyolefin elastomer or metallocene PE and an antitack agent of embedding.
4. like each described polypropylene film of claim 1～3, it is characterized in that described extexine contains the disconnected COPP of embedding of 95～100wt% and the antitack agent of 0～5%wt;
Preferably, the metallocene PE of the intermediate layer disconnected COPP of embedding that contains 65～85wt% and 15～35wt% or contain 60～80wt% atactic copolymerized polypropene and 40～20wt% polyolefin elastic not;
Preferably, hot sealing layer contains the disconnected COPP of embedding of 95～98wt% and the antitack agent of 2～5wt%.
5. like each described polypropylene film of claim 1～4, it is characterized in that, adopt three-layer co-extruded The tape casting production.
6. like each described polypropylene film of claim 1～5, it is characterized in that described polypropylene film does not stretch at 121～135 ℃ of following boiling 30min.
7. like each described polypropylene film of claim 1～6, it is characterized in that described polypropylene film thickness is 30-150 μ m, be preferably 50-100 μ m.
8. like the purposes of each described polypropylene film of claim 1～7, need to be used to the packaging for foodstuff of cooking disinfection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110419277.4A CN102555391B (en) | 2011-12-14 | 2011-12-14 | A kind of polypropylene film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110419277.4A CN102555391B (en) | 2011-12-14 | 2011-12-14 | A kind of polypropylene film |
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| Publication Number | Publication Date |
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| CN102555391A true CN102555391A (en) | 2012-07-11 |
| CN102555391B CN102555391B (en) | 2015-08-19 |
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| CN201110419277.4A Active CN102555391B (en) | 2011-12-14 | 2011-12-14 | A kind of polypropylene film |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103802389A (en) * | 2014-01-17 | 2014-05-21 | 安徽双津实业有限公司 | Ultralow temperature heat-sealing tape-casting polypropylene aluminum plating film |
| CN104334347A (en) * | 2013-04-30 | 2015-02-04 | 宝洁公司 | Flexible package |
| CN104903101A (en) * | 2013-01-18 | 2015-09-09 | 诺瓦化学品(国际)股份有限公司 | Improved multilayer blown films |
| CN106827748A (en) * | 2016-12-21 | 2017-06-13 | 安徽双津实业有限公司 | A kind of flexible boiling film high |
| CN107264957A (en) * | 2017-07-07 | 2017-10-20 | 贺电 | A kind of food packaging barbecue bag |
| CN108357174A (en) * | 2017-12-28 | 2018-08-03 | 安徽双津实业有限公司 | A kind of oxygen uptake active packing boiling film |
| CN108698391A (en) * | 2017-07-10 | 2018-10-23 | 东莞市森特塑胶制品有限公司 | A kind of plastic foil |
| CN108779306A (en) * | 2017-07-10 | 2018-11-09 | 东莞市森特塑胶制品有限公司 | A kind of plastic film layer and the plastic foil using the plastic film layer |
| CN108909123A (en) * | 2018-07-12 | 2018-11-30 | 安徽迈高化工科技有限公司 | A kind of easily peelable digestion resistant polypropylene film |
| CN109367167A (en) * | 2018-11-15 | 2019-02-22 | 佛山市南海利达印刷包装有限公司 | A kind of shock resistance packaging film and its production method |
| CN110641113A (en) * | 2019-09-26 | 2020-01-03 | 珠海市德燊环保包装有限公司 | Ultrahigh-temperature steamed food packaging film and preparation method thereof |
| CN111484700A (en) * | 2019-12-20 | 2020-08-04 | 四川鑫达企业集团有限公司 | High-glossiness high-toughness polypropylene composite material and preparation method thereof |
| CN113954480A (en) * | 2021-11-24 | 2022-01-21 | 佛山新长盛塑料薄膜有限公司 | Food packaging film |
| CN115991909A (en) * | 2021-10-20 | 2023-04-21 | 中国石油化工股份有限公司 | Polypropylene composite film and preparation method and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125595A (en) * | 2007-10-10 | 2008-02-20 | 大庆石油管理局 | Bidirectional stretching heat-sealing extinction film used for package and manufacturing method thereof |
| CN101607616A (en) * | 2009-05-21 | 2009-12-23 | 陈亦锋 | High temperature resistance film for blister package of medical equipment and preparation method thereof |
| CN102152577A (en) * | 2010-12-17 | 2011-08-17 | 惠州宝柏包装有限公司 | Easy-removing cover film with high-temperature resistant polypropylene cup material function and preparation method thereof |
| CN102152565A (en) * | 2010-12-17 | 2011-08-17 | 惠州宝柏包装有限公司 | Current polypropylene film with cohesive peeling function and preparation method thereof |
| CN202037951U (en) * | 2011-03-23 | 2011-11-16 | 上海紫藤包装材料有限公司 | Soft semi-high-temperature cooking membrane |
-
2011
- 2011-12-14 CN CN201110419277.4A patent/CN102555391B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125595A (en) * | 2007-10-10 | 2008-02-20 | 大庆石油管理局 | Bidirectional stretching heat-sealing extinction film used for package and manufacturing method thereof |
| CN101607616A (en) * | 2009-05-21 | 2009-12-23 | 陈亦锋 | High temperature resistance film for blister package of medical equipment and preparation method thereof |
| CN102152577A (en) * | 2010-12-17 | 2011-08-17 | 惠州宝柏包装有限公司 | Easy-removing cover film with high-temperature resistant polypropylene cup material function and preparation method thereof |
| CN102152565A (en) * | 2010-12-17 | 2011-08-17 | 惠州宝柏包装有限公司 | Current polypropylene film with cohesive peeling function and preparation method thereof |
| CN202037951U (en) * | 2011-03-23 | 2011-11-16 | 上海紫藤包装材料有限公司 | Soft semi-high-temperature cooking membrane |
Non-Patent Citations (1)
| Title |
|---|
| 黄棋尤主编: "《塑料包装薄膜—生产 性能 应用》", 31 March 2003, article "塑料包装薄膜—生产 性能 应用" * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104903101A (en) * | 2013-01-18 | 2015-09-09 | 诺瓦化学品(国际)股份有限公司 | Improved multilayer blown films |
| CN104334347A (en) * | 2013-04-30 | 2015-02-04 | 宝洁公司 | Flexible package |
| CN103802389A (en) * | 2014-01-17 | 2014-05-21 | 安徽双津实业有限公司 | Ultralow temperature heat-sealing tape-casting polypropylene aluminum plating film |
| CN106827748A (en) * | 2016-12-21 | 2017-06-13 | 安徽双津实业有限公司 | A kind of flexible boiling film high |
| CN107264957A (en) * | 2017-07-07 | 2017-10-20 | 贺电 | A kind of food packaging barbecue bag |
| CN108698391A (en) * | 2017-07-10 | 2018-10-23 | 东莞市森特塑胶制品有限公司 | A kind of plastic foil |
| CN108779306A (en) * | 2017-07-10 | 2018-11-09 | 东莞市森特塑胶制品有限公司 | A kind of plastic film layer and the plastic foil using the plastic film layer |
| CN108357174A (en) * | 2017-12-28 | 2018-08-03 | 安徽双津实业有限公司 | A kind of oxygen uptake active packing boiling film |
| CN108909123A (en) * | 2018-07-12 | 2018-11-30 | 安徽迈高化工科技有限公司 | A kind of easily peelable digestion resistant polypropylene film |
| CN109367167A (en) * | 2018-11-15 | 2019-02-22 | 佛山市南海利达印刷包装有限公司 | A kind of shock resistance packaging film and its production method |
| CN110641113A (en) * | 2019-09-26 | 2020-01-03 | 珠海市德燊环保包装有限公司 | Ultrahigh-temperature steamed food packaging film and preparation method thereof |
| CN110641113B (en) * | 2019-09-26 | 2021-11-02 | 珠海市德燊环保包装有限公司 | Ultrahigh-temperature steamed food packaging film and preparation method thereof |
| CN111484700A (en) * | 2019-12-20 | 2020-08-04 | 四川鑫达企业集团有限公司 | High-glossiness high-toughness polypropylene composite material and preparation method thereof |
| CN115991909A (en) * | 2021-10-20 | 2023-04-21 | 中国石油化工股份有限公司 | Polypropylene composite film and preparation method and application thereof |
| CN113954480A (en) * | 2021-11-24 | 2022-01-21 | 佛山新长盛塑料薄膜有限公司 | Food packaging film |
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