CN104228255A - Low-weightlessness liquid-washing small-package roll film and preparation method thereof - Google Patents
Low-weightlessness liquid-washing small-package roll film and preparation method thereof Download PDFInfo
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- CN104228255A CN104228255A CN201410461785.2A CN201410461785A CN104228255A CN 104228255 A CN104228255 A CN 104228255A CN 201410461785 A CN201410461785 A CN 201410461785A CN 104228255 A CN104228255 A CN 104228255A
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Abstract
The invention belongs to the technical field of packaging materials, and particularly relates to a low-weightlessness liquid-washing small-package roll film and a preparation method thereof. According to the packaging film, the printing surface of a PET printing film is fit with a VMPET aluminum layer of a vacuum aluminizing PET film by adopting a combination mode of an extrusion functional polyethylene film layer, so as to form a PET/extrusion PE/VMPET composite structure, and finally, dry combination is performed between a PET/extrusion PE/VMPET composite film and one side of a corona layer of a PE film, so as to form a PET/extrusion PE/VMPET/PE composite film. The small-package roll film has the advantages of high mechanical strength and environmental stress crack resistance. The extruded composite structure of four layers of materials has good weather resistance and chemical resistance, a low-weightlessness function can be kept for a long time, and the problems of blocking reduction and weightlessness increase of products in the high-temperature and high-humidity environment in Southeast Asia are effectively solved.
Description
Technical field
The invention belongs to field of packaging material, be specifically related to a kind of low weightless liquid and wash inner wrapping volume film and preparation method thereof.
Background technology
It is a kind of very general manner of packing that the liquid such as softener, shampoo washes inner wrapping, the material-structure of existing inner wrapping volume film is generally: 12PET/18VMBOPP/50LLDPE, the major defect of the inner wrapping volume film of this material-structure is that weatherability and chemical-resistance are poor, be easy to layering, be difficult to adapt to hot and humid environment.Such as, all containing essence, spices, pigment, emulsifying agent, surfactant, various additive in softener, shampoo and washing agent, complex chemical composition, in the high-temperature high humidity season in Southeast Asia, traditional inner wrapping is adopted to roll up the softener product of film, just there will be lamination in various degree after one month, not only had a strong impact on the outward appearance of product, more directly cause the product shelf phase to shorten.
Therefore, how improving the structure of inner wrapping volume film, make it possess good weatherability and chemical-resistance, is the technical barrier that those skilled in the art make great efforts to solve.
Summary of the invention
An object of the present invention is to provide a kind of low weightless liquid and washes inner wrapping volume film, and this package roll film possesses good weatherability and chemical-resistance, can keep low weightless function for a long time.
For achieving the above object, present invention employs following technical scheme:
A kind of low weightless liquid washes inner wrapping volume film, and this packaging film is fitted tightly by the PET printing film layer be connected successively, function film layer, vacuum aluminum-coated PET film layer, polyurethane adhesive adhesion coating and PE thin layer and forms.
The present invention can also be able to further realization by following technical measures:
Preferably, described function film layer is double-layer coextrusion composite construction, and the function film layer side bonding with PET printing film layer is that low density polyethylene (LDPE) and white master batch are blended, and the part by weight of low density polyethylene (LDPE) and white master batch is 75:12; The function film layer side bonding with vacuum aluminum-coated PET film layer is that low density polyethylene (LDPE), ethene-methacrylic acid-acrylate terpolymer resin and white master batch are blended, and the part by weight of low density polyethylene (LDPE), ethene-methacrylic acid-acrylate terpolymer resin and white master batch is 75:25:7.
Preferred further, the low density polyethylene (LDPE) trade mark in described function film layer is L705, and the white master batch trade mark is 7M2001, and the trade mark of low density polyethylene (LDPE), ethene-methacrylic acid-acrylate terpolymer resin is firm AE.
Preferably, described PE thin layer is made up of the corona layer fitted successively, intermediate layer and hot sealing layer, and described corona layer side and polyurethane adhesive adhesion coating fit; Low density polyethylene (LDPE) and the LLDPE of described corona layer to be part by weight be 1:2 are blended; The low density polyethylene (LDPE) of to be part by weight be in described intermediate layer 25:25:25:0.3, LLDPE, metallocene linear-low density polyethylene and processing aid are blended; The low density polyethylene (LDPE) of described hot sealing layer to be part by weight be 25:25:50:1:1, eight carbon LLDPEs, metallocene linear-low density polyethylene, processing aid and opening agent are blended.
Preferred further, the low density polyethylene (LDPE) trade mark in described corona layer is 150BW, and the LLDPE trade mark is for raising son 7042; The low density polyethylene (LDPE) trade mark in described intermediate layer is 150BW, and the LLDPE trade mark is for raising son 7042, and the metallocene linear-low density polyethylene trade mark is 3505HH, and the processing aid trade mark is 100991-K; The low density polyethylene (LDPE) trade mark in described hot sealing layer is 100AC, and the LLDPE trade mark is 2045.11G, and the metallocene linear-low density polyethylene trade mark is PL1881G, and the processing aid trade mark is 100991-K, and the opening agent trade mark is AB-20LD.
Two of object of the present invention is to provide the preparation method that a kind of above-mentioned low weightless liquid washes inner wrapping volume film, and it comprises the steps:
1) printing process: PET film is carried out colored multicolour photogravure by gravure printing apparatus and obtains PET printing film;
To aluminize operation: PET film is obtained vacuum aluminum-coated PET film by vacuum aluminium plating process;
Blown film operation: the material in the material of the corona layer in PE thin layer, intermediate layer, the material of hot sealing layer are added in three hoppers of three-layer co-extruded film blow molding machine group respectively, carries out blown film and obtain PE film;
2) extrude compound working procedure: carry out laminating operation by between the printing surface of PET printing film and the aluminium lamination of vacuum aluminum-coated PET film and VMPET by the mode extruding function film layer compound, form the composite construction that PET/ squeezes PE/VMPET;
3) dry sequence of returning to work: by step 2) PET/ that the prepares corona layer side of squeezing PE/VMPET composite membrane and PE film carry out dry type compound, and form PET/ and squeeze PE/VMPET/PE composite membrane.
Beneficial effect of the present invention is as follows:
1), the medium and small package roll film of the present invention have employed the composite construction that PET/ squeezes PE/VMPET/PE, in composite construction, PET printing film and VMPET (i.e. vacuum aluminum-coated PET film) are namely extruded PE layer by crowded PE to be combined with each other, therefore between PET printing film and VMPET, there is good combined strength bination; In addition, the rationally resin formula of uniqueness of PE film in composite construction, makes whole inner wrapping roll up film and has higher mechanical strength and environmental stress crack resistance.4 layers of material in the present invention are squeezed complex structure and are had good weatherability and chemical-resistance, can keep low weightless function for a long time, efficiently solve product barrier under the hot and humid environment of Southeast Asia and reduce and the weightless problem increased.
2) namely the function film layer, in the present invention is squeezed PE layer and is adopted A, B double-layer coextrusion structure, and formula Design is as follows:
A. bonding PET printing film layer (corresponding PET printing film):
The part by weight of L705+7M2001, L705 and 7M2001 is 75:12;
B. bonding VMPET layer (corresponding VMPET and vacuum aluminum-coated PET film):
The part by weight of L705+ firm AE+7M2001, L705, firm AE and 7M2001 is 75:25:7.
Wherein, " L705 " extrudes application of resin (LDPE and low density polyethylene (LDPE)) for the polyethylene from high pressure process that SUMITOMO CHEMICAL company produces, and has good constriction characteristic and low temperature seal performance; " firm AE " is a kind of ethene-methacrylic acid-acrylate terpolymer resin that du pont company produces, this resin is the bonding of a kind of high-performance and heat sealing resin, can significantly improve the cohesive of LDPE to vacuum aluminum-coated PET film when the ratio with 20% ~ 40% adds the ratio mixing of the LDPE of 80% ~ 60%.White master batch that " 7M2001 " is the production of Shanghai Jin Zhu color masterbatch Co., Ltd, its with LDPE resin for carrier.
Squeeze in A, B double-layer coextrusion structure of PE layer in the present invention, A layer makes film have the good thickness uniformity, and B layer makes crowded PE layer have good combined strength bination to PET printing film and vacuum aluminum-coated PET film.
In addition, the formula Design of the two-layer different adding proportion of A, B in the present invention had both ensured the hybrid process with LDPE (L705), also ensure the whiteness that crowded PE layer is wanted and covering power, avoid the impact of the Color pair printing color of vacuum aluminum-coated PET film.
3), from above-mentioned 2), the structure of squeezing PE layer in the present invention makes this volume film possess the good thickness uniformity, thus it is good to ensure that volume film walks film fluency on automatic packaging machine, and packaging bag involution there will not be the phenomenon of space of a whole page sideslip.Therefore the horizontal typesetting repetition space of a whole page of this volume film can reach more than 3, and namely this volume film once can be packed simultaneously produce multiple product on automatic packaging machine, greatly improves the production efficiency of product.
4) the PE film, in the present invention in PE thin layer has unique and excellent resin formula
Corona layer: 25 weight portion 150BW+50 weight portions raise son 7042;
Intermediate layer: 25 weight portion 150BW+25 weight portions raise sub-7042+25 weight portion 3505HH+0.3 weight portion 100991-K;
Hot sealing layer: 25 weight portion Exxon 100AC+25 weight portion 2045.11G+50 weight portion PL1881G+1 weight portion 10090-K+1 weight portion AB-20LD.
The Thickness Ratio of corona layer, intermediate layer and hot sealing layer is 3:4:3.
" 150BW " in corona layer is the LDPE that Exxon Mobil Corporation produces, LLDPE (i.e. LLDPE) " Yang Zi 7042 " hybrid process in certain proportion of producing with Yang Zi petro-chemical corporation of China Petrochemical Industry, contribute to the various performances improving film, and the blown film of blend can be carried out on the equipment of processing LDPE, and these two kinds of particles self are not containing any slipping agent, the combined strength bination after therefore also ensure that corona.
Intermediate layer adds " 3505HH " that Exxon Mobil Corporation produces, this resin is the metallocene linear-low density polyethylene (mLLDPE) using metallocene catalyst polymerisation, there is excellent combination property, comprise the advantage of film processing properties and high alhpa olefin; 100991-k is the processing aid that peace color matching company of Thailand produces, and can not affect the bonding of goods, printing and heat sealability, also can not affect the physical property of resin itself, and can improve polyolefinic processing characteristics after adding after interpolation.
In hot sealing layer, " 100AC " is the LDPE that Exxon Mobil Corporation produces; " 2045.11G " is the eight carbon LLDPEs (C8-LLDPE) that the Dow Chemical Company produces, and compared with C6 or C4 product, has better mechanical strength and heat seal strength; " PL1881G " is the metallocene linear-low density polyethylene (mLLDPE) that the Dow Chemical Company produces, there is excellent toughness, and good low temperature plays sealing property, high heat-sealing strength and antipollution heat sealability make film more can meet the requirement of high-speed liquid packaging.100991-k is the processing aid that peace color matching company of Thailand produces, same to intermediate layer; AB-20LD is opening agent, ensure that the Kekelé structure count of sack preferably.
Three kinds of resins (i.e. " 100AC ", " 2045.11G " and " PL1881G ") in hot sealing layer self all contain a certain proportion of slipping agent and opening agent, the addition of additional slipping agent and opening agent can be reduced like this, the slipping agent avoiding interpolation too much or mix uneven and easily cause slipping agent migration precipitation, thus affects the combined strength bination of internal layer.
5), this package roll film barrier property is high, can ensure the quality of content well, extends the shelf cycle.
6), this package roll film heat sealability and sealing be good, and impact resistance is good, and physical and mechanical properties is excellent.
Accompanying drawing explanation
Fig. 1 is the structural representation of the high-isolating packaging film in the present invention.
Fig. 2 is the preparation flow figure of the high-isolating packaging film in the present invention.
The implication marked in figure is as follows:
10-PET printing film layer, 20-function film layer
30-vacuum aluminum-coated PET film layer, 40-polyurethane adhesive adhesion coating
50-PE thin layer, 51-corona layer, 52-intermediate layer, 53-hot sealing layer
Detailed description of the invention
Below in conjunction with specific embodiment, preparation process of the present invention is elaborated.
In the examples below that, as being not particularly illustrated, described method is customary preparation methods, and described percentage composition is weight percentage.
Embodiment 1
Refer to Fig. 1, inner wrapping volume film in the present invention is the composite construction that PET/ squeezes PE/VMPET/PE, wherein the thickness of PET and PET film layer 10 is 12 μm, the thickness of crowded PE and function film layer 20 is 10 μm, the thickness of VMPET and vacuum aluminum-coated PET film layer 30 is 12 μm, and the thickness of PE and PE thin layer 50 is 55 μm.
The formula of PE thin layer 50 is as follows:
Corona layer: 25Kg150BW+50Kg raises son 7042;
Intermediate layer: 25Kg150BW+25Kg raises sub-7042+25kg3505HH+0.3Kg100991-K;
Hot sealing layer: 25Kg Exxon 100AC+25Kg2045.11G+50KgPL1881G+1.0Kg10090-K+1.0KgAB-20LD.
The thickness of three layers of corona layer, intermediate layer and hot sealing layer is 16 μm, 23 μm, 16 μm respectively.
Refer to Fig. 2, the preparation method of the inner wrapping volume film in the present invention specifically comprises the steps:
1) printing process: PET film is carried out colored multicolour photogravure by gravure printing apparatus according to normal technological process and obtains PET printing film;
To aluminize operation: PET film is obtained vacuum aluminum-coated PET film by vacuum aluminium plating process;
Blown film operation: the material in the material of the corona layer 51 in PE thin layer 50, intermediate layer 52, the material of hot sealing layer 53 are added in three hoppers of three-layer co-extruded film blow molding machine group respectively, carries out blown film and obtain PE film.
2) compound working procedure is extruded: adopt double-layer coextrusion extruder, carry out laminating operation by between the printing surface of PET printing film and the aluminium lamination of vacuum aluminum-coated PET film and VMPET by the mode extruding function film layer compound; When extruding, the PET printing film prepared is placed in the position that extruder one is put, the vacuum aluminum-coated PET film prepared is placed in the position that extruder two is put, resin granular material is inserted in extruder die head, PE is extruded in the middle of PET printing film and vacuum aluminum-coated PET film, form the composite construction that PET/ squeezes PE/VMPET, extruder is by PET film printed layers following A material, and the printing surface that PE and PET film are extruded in this side is fitted; Extruder is expected with following B by the aluminium lamination of VMPET, and the aluminium lamination that PE and vacuum aluminum-coated PET film are extruded in this side is fitted;
A expects. bonding PET printing film layer (corresponding PET printing film):
75kgL705+14kg7M2001, thickness is 4 μm;
B. bonding VMPET layer (corresponding VMPET and vacuum aluminum-coated PET film):
The firm AE+7kg7M2001 of 75kgL705+25kg, thickness is 6 μm;
3) dry sequence of returning to work: by step 2) PET/ that the prepares corona layer side of squeezing PE/VMPET composite membrane and PE film carry out dry type compound, and form PET/ and squeeze PE/VMPET/PE composite membrane.
Embodiment 2
Refer to Fig. 1, inner wrapping volume film in the present invention is the composite construction that PET/ squeezes PE/VMPET/PE, wherein the thickness of PET and PET film layer 10 is 12 μm, the thickness of crowded PE and function film layer 20 is 12 μm, the thickness of VMPET and vacuum aluminum-coated PET film layer 30 is 12 μm, and the thickness of PE and PE thin layer 50 is 50 μm.
The formula of PE thin layer 50 is as follows:
Corona layer: 25Kg150BW+50Kg raises son 7042;
Intermediate layer: 25Kg150BW+25Kg raises sub-7042+25kg3505HH+0.3Kg100991-K;
Hot sealing layer: 25Kg Exxon 100AC+25Kg2045.11G+50KgPL1881G+1.0Kg10090-K+1.0KgAB-20LD.
The thickness of three layers of corona layer, intermediate layer and hot sealing layer is 15 μm, 20 μm, 15 μm respectively.
Refer to Fig. 2, the preparation method of the inner wrapping volume film in the present invention specifically comprises the steps:
1) printing process: PET film is carried out colored multicolour photogravure by gravure printing apparatus according to normal technological process and obtains PET printing film;
To aluminize operation: PET film is obtained vacuum aluminum-coated PET film by vacuum aluminium plating process;
Blown film operation: the material in the material of the corona layer 51 in PE thin layer 50, intermediate layer 52, the material of hot sealing layer 53 are added in three hoppers of three-layer co-extruded film blow molding machine group respectively, carries out blown film and obtain PE film.
2) compound working procedure is extruded: adopt double-layer coextrusion extruder, carry out laminating operation by between the printing surface of PET printing film and the aluminium lamination of vacuum aluminum-coated PET film and VMPET by the mode extruding function film layer compound; When extruding, the PET printing film prepared is placed in the position that extruder one is put, the vacuum aluminum-coated PET film prepared is placed in the position that extruder two is put, resin granular material is inserted in extruder die head, PE is extruded in the middle of PET printing film and vacuum aluminum-coated PET film, form the composite construction that PET/ squeezes PE/VMPET, extruder is by PET film printed layers following A material, and the printing surface that PE and PET film are extruded in this side is fitted; Extruder is expected with following B by the aluminium lamination of VMPET, and the aluminium lamination that PE and vacuum aluminum-coated PET film are extruded in this side is fitted;
A expects. bonding PET printing film layer (corresponding PET printing film):
75kgL705+14kg7M2001, thickness is 5 μm;
B. bonding VMPET layer (corresponding VMPET and vacuum aluminum-coated PET film):
The firm AE+7kg7M2001 of 75kgL705+25kg, thickness is 7 μm;
3) dry sequence of returning to work: by step 2) PET/ that the prepares corona layer side of squeezing PE/VMPET composite membrane and PE film carry out dry type compound, and form PET/ and squeeze PE/VMPET/PE composite membrane.
Embodiment 3
Refer to Fig. 1, inner wrapping volume film in the present invention is the composite construction that PET/ squeezes PE/VMPET/PE, wherein the thickness of PET and PET film layer 10 is 12 μm, the thickness of crowded PE and function film layer 20 is 15 μm, the thickness of VMPET and vacuum aluminum-coated PET film layer 30 is 12 μm, and the thickness of PE and PE thin layer 50 is 45 μm.
The formula of PE thin layer 50 is as follows:
Corona layer: 25Kg150BW+50Kg raises son 7042;
Intermediate layer: 25Kg150BW+25Kg raises sub-7042+25kg3505HH+0.3Kg100991-K;
Hot sealing layer: 25Kg Exxon 100AC+25Kg2045.11G+50KgPL1881G+1.0Kg10090-K+1.0KgAB-20LD.
The thickness of three layers of corona layer, intermediate layer and hot sealing layer is 13 μm, 19 μm, 13 μm respectively.
Refer to Fig. 2, the preparation method of the inner wrapping volume film in the present invention specifically comprises the steps:
1) printing process: PET film is carried out colored multicolour photogravure by gravure printing apparatus according to normal technological process and obtains PET printing film;
To aluminize operation: PET film is obtained vacuum aluminum-coated PET film by vacuum aluminium plating process;
Blown film operation: the material in the material of the corona layer 51 in PE thin layer 50, intermediate layer 52, the material of hot sealing layer 53 are added in three hoppers of three-layer co-extruded film blow molding machine group respectively, carries out blown film and obtain PE film.
2) compound working procedure is extruded: adopt double-layer coextrusion extruder, carry out laminating operation by between the printing surface of PET printing film and the aluminium lamination of vacuum aluminum-coated PET film and VMPET by the mode extruding function film layer compound; When extruding, the PET printing film prepared is placed in the position that extruder one is put, the vacuum aluminum-coated PET film prepared is placed in the position that extruder two is put, resin granular material is inserted in extruder die head, PE is extruded in the middle of PET printing film and vacuum aluminum-coated PET film, form the composite construction that PET/ squeezes PE/VMPET, extruder is by PET film printed layers following A material, and the printing surface that PE and PET film are extruded in this side is fitted; Extruder is expected with following B by the aluminium lamination of VMPET, and the aluminium lamination that PE and vacuum aluminum-coated PET film are extruded in this side is fitted;
A expects. bonding PET printing film layer (corresponding PET printing film):
75kgL705+14kg7M2001, thickness is 6 μm;
B. bonding VMPET layer (corresponding VMPET and vacuum aluminum-coated PET film):
The firm AE+7kg7M2001 of 75kgL705+25kg, thickness is 9 μm;
3) dry sequence of returning to work: by step 2) PET/ that the prepares corona layer side of squeezing PE/VMPET composite membrane and PE film carry out dry type compound, and form PET/ and squeeze PE/VMPET/PE composite membrane.
The main performance technical indicator of the package roll film in above-mentioned three embodiments refers to table 1
The main performance technical indicator of table 1 package roll film
Skin in table 1 is PET film layer 10, and secondary internal layer is vacuum aluminum-coated PET film layer 30, and internal layer is PE thin layer 50.
Testing result shows, the inner wrapping volume film in the present invention has higher mechanical strength and barrier.4 layers of material in the present invention are squeezed complex structure and are had good weatherability and chemical-resistance, lamination can be there is not for a long time in hot and humid environment, keep low weightless function, efficiently solve product barrier under the hot and humid environment of Southeast Asia and reduce and the weightless problem increased.
Claims (6)
1. low weightless liquid washes an inner wrapping volume film, it is characterized in that: this packaging film is fitted tightly by the PET printing film layer (10) be connected successively, function film layer (20), vacuum aluminum-coated PET film layer (30), polyurethane adhesive adhesion coating (40) and PE thin layer (50) and forms.
2. low weightless liquid according to claim 1 washes inner wrapping volume film, it is characterized in that: described function film layer (20) is double-layer coextrusion composite construction, function film layer (20) side bonding with PET printing film layer (10) is that low density polyethylene (LDPE) and white master batch are blended, and the part by weight of low density polyethylene (LDPE) and white master batch is 75:12; Function film layer (20) side bonding with vacuum aluminum-coated PET film layer (30) is that low density polyethylene (LDPE), ethene-methacrylic acid-acrylate terpolymer resin and white master batch are blended, and the part by weight of low density polyethylene (LDPE), ethene-methacrylic acid-acrylate terpolymer resin and white master batch is 75:25:7.
3. low weightless liquid according to claim 2 washes inner wrapping volume film, it is characterized in that: the low density polyethylene (LDPE) trade mark in described function film layer (20) is L705, the white master batch trade mark is 7M2001, and the trade mark of ethene-methacrylic acid-acrylate terpolymer resin is firm AE.
4. low weightless liquid according to claim 3 washes inner wrapping volume film, it is characterized in that: described PE thin layer (50) is made up of the corona layer (51) fitted successively, intermediate layer (52) and hot sealing layer (53), described corona layer (51) side and polyurethane adhesive adhesion coating (40) fit;
Described corona layer (51) for part by weight be that the low density polyethylene (LDPE) of 1:2 and LLDPE are blended;
Described intermediate layer (52) for part by weight be that the low density polyethylene (LDPE) of 25:25:25:0.3, LLDPE, metallocene linear-low density polyethylene and processing aid are blended;
Described hot sealing layer (53) for part by weight be that the low density polyethylene (LDPE) of 25:25:50:1:1, eight carbon LLDPEs, metallocene linear-low density polyethylene, processing aid and opening agent are blended.
5. low weightless liquid according to claim 4 washes inner wrapping volume film, it is characterized in that:
The low density polyethylene (LDPE) trade mark in described corona layer (51) is 150BW, and the LLDPE trade mark is for raising son 7042;
The low density polyethylene (LDPE) trade mark in described intermediate layer (52) is 150BW, and the LLDPE trade mark is for raising son 7042, and the metallocene linear-low density polyethylene trade mark is 3505HH, and the processing aid trade mark is 100991-K;
The low density polyethylene (LDPE) trade mark in described hot sealing layer (53) is 100AC, the LLDPE trade mark is 2045.11G, the metallocene linear-low density polyethylene trade mark is PL1881G, and the processing aid trade mark is 100991-K, and the opening agent trade mark is AB-20LD.
6. the low weightless liquid according to any one of claim 2 ~ 5 washes a preparation method for inner wrapping volume film, and it comprises the steps:
1) printing process: PET film is carried out colored multicolour photogravure by gravure printing apparatus and obtains PET printing film;
To aluminize operation: PET film is obtained vacuum aluminum-coated PET film by vacuum aluminium plating process;
Blown film operation: the material in the material of the corona layer in PE thin layer (50), intermediate layer, the material of hot sealing layer are added in three hoppers of three-layer co-extruded film blow molding machine group respectively, carries out blown film and obtain PE film;
2) extrude compound working procedure: carry out laminating operation by between the printing surface of PET printing film and the aluminium lamination of vacuum aluminum-coated PET film and VMPET by the mode extruding function film layer compound, form the composite construction that PET/ squeezes PE/VMPET;
3) dry sequence of returning to work: by step 2) PET/ that the prepares corona layer side of squeezing PE/VMPET composite membrane and PE film carry out dry type compound, and form PET/ and squeeze PE/VMPET/PE composite membrane.
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