CN101402269A - Viscosity-increasing precoating film of biaxial tension - Google Patents

Viscosity-increasing precoating film of biaxial tension Download PDF

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CN101402269A
CN101402269A CNA2008102248256A CN200810224825A CN101402269A CN 101402269 A CN101402269 A CN 101402269A CN A2008102248256 A CNA2008102248256 A CN A2008102248256A CN 200810224825 A CN200810224825 A CN 200810224825A CN 101402269 A CN101402269 A CN 101402269A
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film
ethylene
hot melt
melt adhesive
eva
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CN101402269B (en
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钟玉
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Kang Kang composite material group Limited by Share Ltd
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BEIJING KANGDE XIN COMPOSITE MATERIAL Co Ltd
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Abstract

The invention relates to a bidirectional stretched precoating film with increased viscosity and a processing technology thereof. The precoating film comprises a base material, a middle layer and a hot melt adhesive layer, and is characterized in that the base material is a bidirectional stretched polyester (BOPET) film or a bidirectional stretched polypropylene (BOPP) film, the middle layer is made from polyethylene imine (PEI), and the hot melt adhesive layer is a mixture consisting of ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA). The bidirectional stretched precoating film with the increased viscosity is obtained by using an extruded compound production line to evenly coat and clad the middle layer and the hot melt adhesive layer on one surface of the base material in turn. Because the resin adopted by the hot melt adhesive layer of the precoating film is the mixture consisting of the ethylene-vinyl acetate (EVA) and the ethylene-methyl acrylate copolymer (EMA), the precoating film has far larger cohesive force to printed matters than the precoating film of which the hot melt adhesive is pure EVA, and can remarkably show the high cohesive force particularly to the printed matters containing silicone oil ink or the printed matters containing water-based ink.

Description

A kind of viscosity-increasing precoating film of biaxial tension
Affiliated field
The present invention relates to print the film coating technique field, particularly a kind of viscosity-increasing precoating film of biaxial tension and processing technology.
Background technology
The printed matter overlay film is the important means of post-press finishing, the final personal value of its decision print product.The coating technique of printed matter is meant with plastic sheeting and covers above the paper printing matter, the middle adhesive that uses, after the heating pressurized treatments, two kinds of materials of different nature of plastic sheeting and paper are bonded together, form paper/the mould incrustation process technology of unification.It plays protection and decorative effect to printed matter, is widely used in the packages printing field, on the Surface Machining as Front cover of book and periodical, propaganda picture album, map, advertising specialty bag, senior packing box etc.Overlay film can divide promptly films and two kinds of pre-coating films.
Be coated with membrane technology and be that the international sixties rise to coating technique behind the seal of printed matter, package.But this technology is directly used in the overlay film process and is contained benzene solvent, thereby has brought the three big drawbacks that can't overcome owing to self technology:
(1) environmental issue: because the volatilization of noxious material benzene and overflowing has caused air pollution and brought very big harm for the producer and user's health; Simultaneously, the harmful substance that residues in the overlay film has harmful effect to consumer's health.
(2) quality problems: owing to still have volatile substance benzene constantly to overflow after the overlay film processing, very easily between film and paper, form bubble, make printing product surface be vaporific, influence fineness, definition and the colour vividness of printing; Sometimes because of bonding strength is not enough, even cause cracking, fold and demoulding.In addition, the production equipment automaticity of promptly filming is low, has reduced the overlay film yield rate.
(3) safety problem: owing to contain volatile organic solvent benzene in the solution, form flammable, explosive atmosphere easily around the liquid bath, and the plastic basis material that the uses generation static that rub causes disaster hidden-trouble in operation process.Such accident number had taken place, and little then the shutdown stops production, and greatly then machine burns, and factory building caves in, casualties.
The pre-coating film film coating technique is the green technology of sustainable development.The pre-coating film film coating technique also can be referred to as environmental friendliness technology or clean technologies, has realized the protection environment, protects the health, has kept the safety in production.In pre-coating film production and the use, the volatilization that toxic gas does not take place is polluted, and therefore, effectively improves working environment, eliminates the disaster hidden-trouble that production site and product are stored; Use the pre-coating film product,, can be widely used on the packing of books and periodicals (especially student textbook), food, tobacco and wine, medicine etc. the consumer not being constituted potential threat owing to wherein do not have the hazard residue material; The process procedures such as allotment, coating and oven dry of binder have been saved simultaneously, the whole film covering process can in seconds be finished, and can not produce pollution to environment, does not have disaster hidden-trouble, do not need to clean automatic double surface gluer etc. yet, can realize high speed, efficient, high-quality overlay film; Pre-coating film has promoted the color saturation of printed matter and definition, has obviously increased its artistic effect; and printed matter played a protective role; make it water-fast, moisture resistance, fast light, prevent pollution, anti-chemical corrosion; increase the service life; improve durability, collection and the ornamental value of printed matter greatly, promoted the commercial competitiveness and the added value of product.
Common BOPP pre-coating film or common BOPET pre-coating film, because its hot melt adhesive layer is pure EVA, its cohesive force to printed matter is very little in the finished product application process, especially at printed matter that contains silicone oil printing ink or water color ink printed matter, cohesive force is littler.
Summary of the invention
The objective of the invention is: a kind of viscosity-increasing precoating film of biaxial tension and processing method are provided, produce a kind of novel pre-coating film, improve novel pre-coating film cohesive force to printed matter in the finished product application process, especially the cohesive force at printed matter that contains silicone oil printing ink or water color ink printed matter improves.
The technical scheme that the present invention is taked for its technical problem of solution is:
Viscosity-increasing precoating film of biaxial tension is characterized in that: be made up of base material, intermediate layer and hot melt adhesive layer, wherein: base material adopts Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film; What the intermediate layer applied is that solid content is aqueous solution polymine (PEI) aqueous solution of 0.7%-1.2%, and coated weight is 0.01g/m 2, polymine after the drying (PEI) is evenly distributed on described film surface; Hot melt adhesive layer is the mixture that ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) constitute, VA content in the ethylene-vinyl acetate (EVA) is 15-20%, melt index is 11-20g/10min, the melt index of ethylene-methyl acrylate copolymer (EMA) is 15-20g/10min, the mixed proportion of the two: ethylene-vinyl acetate (EVA) is 50-70%, and ethylene-methyl acrylate copolymer (EMA) is 30-50%.Base material, intermediate layer and hot melt adhesive layer gross thickness are the 29-45 micron, and wherein the thickness of base material is the 9-15 micron, the thickness 20-30 micron of hot melt adhesive layer.
If base material is Biaxially oriented polypropylene (BOPP) film, its thickness is the 12-15 micron; The ethylene-vinyl acetate of hot melt adhesive layer (EVA) with the percentage by weight of ethylene-methyl acrylate copolymer (EMA) is: ethylene-vinyl acetate (EVA) is 52%, ethylene-methyl acrylate copolymer (EMA) is 48%, VA content in the ethylene-vinyl acetate (EVA) is 18%, melt index is 15g/10min, the melt index of ethylene-methyl acrylate copolymer (EMA) is 17g/10min, and the thickness of hot melt adhesive layer is 25 microns.Base material, intermediate layer and hot melt adhesive layer gross thickness are the 37-40 micron.
If base material is biaxial stretching polyester (BOPET) film, its thickness often is the 9-12 micron; The ethylene-vinyl acetate of hot melt adhesive layer (EVA) with the percentage by weight of ethylene-methyl acrylate copolymer (EMA) is: ethylene-vinyl acetate (EVA) is 61%, ethylene-methyl acrylate copolymer (EMA) is 39%, VA content in the ethylene-vinyl acetate (EVA) is 18%, and melt index is 15g/10min; The melt index of ethylene-methyl acrylate copolymer (EMA) is 17g/10min, and the thickness of hot melt adhesive layer is 25 microns.Base material, centre and hot melt adhesive layer gross thickness are the 34-37 micron.
The molecular formula of described polymine (PEI): (CH 2CH 2NH) n, select the n value in the scope of 1000-10000 according to the mean molecule quantity of polymer.
The processing method of viscosity-increasing precoating film of biaxial tension
One, the preparation of intermediate layer materials and hot melt adhesive layer materials
The preparation of A, intermediate layer materials: with solid content is that to be deployed into solid content be 0.95% polymine (PEI) aqueous solution for 5% polymine (PEI) aqueous solution, add alcohol (analyzing pure) again, the weight ratio of 0.95% polymine (PEI) aqueous solution and alcohol is 20: 1.Stir and obtain the intermediate layer materials.
The preparation of B, hot melt adhesive layer materials: with ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) according to percentage by weight be: ethylene-vinyl acetate (EVA) is 50-70%, and ethylene-methyl acrylate copolymer (EMA) is 30-50%.Add in the homogenizer and mix about 1-5 of the time that mixes minute.
Two, unreel
With Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film substrate volume, be placed on the unreeling machine and and unreel by the inflatable axle, the base material that is about to raw material and is web-like launches.
Three, corona
Because Biaxially oriented polypropylene (BOPP) film belongs to non-polar material, but its surface does not have good viscosity, and promptly its moistened surface tension force is little, so poly-interior alkene (BOPP) film of biaxial tension must pass through sided corona treatment.For itself and polymine (PEI) aqueous solution are well bonded together, need carry out the polar group that corona pre-treatment has certain activity with acquisition to its surface.Therefore, need carry out sided corona treatment to the surface (surface that combines with PEI) of preparation coating polyethylene imines (PEI) aqueous solution of Biaxially oriented polypropylene (BOPP) film, to obtain a certain amount of polar group such as carbonyl one class, represent the degree of sided corona treatment with wetting tension (dyne value), the dyne value that reaches Biaxially oriented polypropylene (BOPP) film surface is 36.
If base material is biaxial stretching polyester (BOPET) film,, can not carry out sided corona treatment because biaxial stretching polyester (BOPET) film is a polar material.
Sided corona treatment is to handle through the high-frequency and high-voltage electric spark, make the chain molecule fracture of Biaxially oriented polypropylene (BOPP) film surface, free radical that produces during the chain fracture and air corona product generation oxidation, cross-linking reaction, at Biaxially oriented polypropylene (BOPP) film surface polarization group, the segment polarity group injects film inside makes surface coarsening, thereby has increased the surface tension of film.
The equipment that the sided corona treatment process adopts is to be provided by U.S. Enercon company, and model is TF1006.
The sided corona treatment operating process, those skilled in the art know, and are not described in detail.
Four, apply the intermediate layer
By the silane coupling agent coating equipment, evenly apply the intermediate layer materials that one deck has configured on surface or surface of biaxial stretching polyester (BOPET) film of Biaxially oriented polypropylene (BOPP) film sided corona treatment.The quantity that applies the intermediate layer materials is 0.01g/m 2
The silane coupling agent coating equipment is provided by U.S. Black Clawson, COATER/DRYER (S.O.#C/A-1125-04).
Five, oven dry
Utilize drying plant will be coated with Biaxially oriented polypropylene (BOPP) film or the oven dry of biaxial stretching polyester (BOPET) film of polymine (PEI) aqueous solution, make polymine (PEI) be solidificated in Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film surface, bake out temperature is about 85-95 ℃.The thickness in intermediate layer, oven dry back is the 0.01-0.03 micron.
The equipment that the oven dry processing procedure adopts is to be provided by U.S. Black Clawson, COATER/DRYER (S.O.#C/A-1125-04).
Six, extruding composite hot melt glue-line
Be loaded with Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film of drying polymine (PEI), be sent to compound position by the deflector roll of extruding composite production line.Extruder extruding and hot melting glue-line is with expecting on Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film.On the next door, compound position of extruding composite production line ozone generator is arranged.Ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) mixture (hot melt adhesive layer 3 materials) curtain coating place that the ozone that is produced by ozone generator is jetted and extruded to extruder, the concentration of ozone is 40%, power 800W, gas flow is 3.5SCXFM, and ozone makes ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) curtain coating surface produce some polar groups.The extruding of Biaxially oriented polypropylene (BOPP) film that is loaded with polymine (PEI) then and the curtain coating nip roller by extruding the compound position of composite production line combines.Extruding back forms composite membrane, after stretched again, cooling (temperature is 18 ℃), the deburring, is admitted to calibrator and detects.
During this time, the pressure of nip roller is 35PSI, and the desired temperature of extruder is respectively 130,160,190,200,220,220,220,220,220,220,220,220,220,220,220,220,220,220 ℃.
Seven, thickness measure and adjustment
Because the β ray has extremely strong penetrability and accurate measurement performance in short distance, the present invention's measurement is exactly to utilize Beta-ray this feature to measure the thickness of pre-coating film, after the measurement its result is fed back to computer, the die lip aperture at the screw speed of computer control extruder and die head position is so that obtain the pre-coating film of thickness uniformity.
The beta-ray measurement instrument is provided by U.S. NDC company, and model is 6100TC/300.
Eight, sided corona treatment
Since hot melt adhesive layer (EVA/EMA) polarity a little less than, in order to make in the product application, that is: in pre-coating film and the printed matter recombination process, have good cohesive force, need carry out the polar group that certain preliminary treatment has certain activity with acquisition to the hot melt adhesive layer surface, therefore, sided corona treatment is carried out on hot melt adhesive layer (EVA/EMA) surface, obtaining a certain amount of polar group, represent the degree of sided corona treatment to reach hot melt adhesive layer surface dyne value in the 50-54 scope with wetting tension (dyne value).
Nine, rolling
Pre-coating film harvest coiled material after utilizing winder with corona.
Ten, cut
According to client's conditions of demand, the pre-coating film of winder harvest coiled material is cut into the volume of cutting of required width of client and length.
After above-mentioned ten steps processing, obtain viscosity-increasing precoating film of biaxial tension.
Beneficial effect of the present invention: viscosity-increasing precoating film of biaxial tension of the present invention and processing technology, it is a kind of novel pre-coating film, this pre-coating film its cohesive force to printed matter in the finished product application process will be far longer than common pre-coating film, because the hot melt adhesive layer of common pre-coating film is pure EVA, especially at printed matter that contains silicone oil printing ink or water color ink printed matter, its high cohesive force more can highlight, be that common pre-coating film is incomparable, capture the unconquerable difficult problem of common pre-coating film, filled up the unapproachable market vacancy of common pre-coating film.
Description of drawings
Fig. 1 is the cross sectional representation of viscosity-increasing precoating film of biaxial tension.
Fig. 2 is in the step 6, the flowage structure schematic diagram of extruding composite hot melt glue-line 3.
Fig. 3 is in the step 6, extruding makes Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film, with the schematic diagram that combines the generation novel substance between polymine (PEI) and ethylene-vinyl acetate (the EVA)/ethylene-methyl acrylate copolymer (EMA).
The specific embodiment
Embodiment 1: with width is that 1580 millimeters bidirectional stretching polypropylene film (BOPP) viscosity-increasing precoating film is an example, is elaborated.
Consult Fig. 1.Bidirectional stretching polypropylene film (BOPP) viscosity-increasing precoating film is made up of base material 1, intermediate layer 2 and hot melt adhesive layer 3.Base material 1, intermediate layer 2 are identical with the width of hot melt adhesive layer 3.
Bidirectional stretching polypropylene film (BOPP) viscosity-increasing precoating film processing method:
One, the preparation of intermediate layer 2 materials and hot melt adhesive layer 3 materials
The preparation of A, intermediate layer 2 materials: with solid content is that to be deployed into solid content in container be 0.95% polymine (PEI) aqueous solution for 5% polymine (PEI) aqueous solution, add alcohol (analyzing pure) again, the weight ratio of 0.95% polymine (PEI) aqueous solution and alcohol is 20: 1.Stirring, it is standby to obtain intermediate layer 2 materials.The mean molecule quantity of polymine (PEI) is 5000.
The preparation of B, hot melt adhesive layer 3 materials: ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) are compared according to mixed weight: ethylene-vinyl acetate (EVA) is 50%, ethylene-methyl acrylate copolymer (EMA) is 50%, add in the homogenizer and mix about 3 minutes of the time that mixes.VA content in the ethylene-vinyl acetate (EVA) is 18%, and melt index is 15g/10min, and the melt index of ethylene-methyl acrylate copolymer (EMA) is 17g/10min.
Two, unreel
With width is 1600 millimeters Biaxially oriented polypropylene (BOPP) film substrate 1 volume, is placed on the unreeling machine and by the inflatable axle to unreel.The thickness of base material 1 is 15 microns.
Three, corona
Sided corona treatment is carried out on surface to preparation coating polyethylene imines (PEI) aqueous solution of Biaxially oriented polypropylene (BOPP) film, and the dyne value that reaches Biaxially oriented polypropylene (BOPP) film surface is 36.
The equipment that the sided corona treatment process adopts is to be provided by U.S. Enercon company, and model is TF1006
Four, apply intermediate layer 2
By the silane coupling agent coating equipment, evenly apply intermediate layer 2 materials that one deck has configured on the surface of Biaxially oriented polypropylene (BOPP) film sided corona treatment.The quantity that applies intermediate layer 2 materials is 0.01g/m 2
The silane coupling agent coating equipment is provided by U.S. Black Clawson, COATER/DRYER (S.O.#C/A-1125-04).
Five, oven dry
Utilize drying plant will be coated with Biaxially oriented polypropylene (BOPP) the film oven dry of polymine (PEI) aqueous solution, make polymine (PEI) be solidificated in Biaxially oriented polypropylene (BOPP) film surface, bake out temperature is 90 ℃.The thickness in intermediate layer 2, oven dry back is about 0.01 micron.
The equipment that the oven dry processing procedure adopts is to be provided by U.S. Black Clawson, COATER/DRYER (S.O.#C/A-1125-04).
Six, the composite hot melt glue-line 3
Consult Fig. 2.Be loaded with Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film of drying polymine (PEI), be sent to compound position by the deflector roll of extruding equipment complex.Extruder extruding and hot melting glue-line 3 usefulness are expected on Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film.On the next door, compound position of extruding equipment complex ozone generator is arranged.Ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) mixture (hot melt adhesive layer 3 materials) curtain coating place that the ozone that is produced by ozone generator is jetted and extruded to extruder.The concentration of ozone is 40%, and power 800W, gas flow are 3.5SCXFM, and ozone makes ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) curtain coating surface produce some polar groups.The extruding of Biaxially oriented polypropylene (BOPP) film that is loaded with polymine (PEI) then and the curtain coating nip roller by extruding equipment complex combines.Consult Fig. 3.After the extruding, Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film, generate hydrogen bond or novel substance with combining between polymine (PEI) and ethylene-vinyl acetate (the EVA)/ethylene-methyl acrylate copolymer (EMA), then form composite membrane, after stretched again, cooling, the deburring, be admitted to calibrator and detect.25 microns of the thickness of hot melt adhesive layer 3.
During this time, the pressure of nip roller is 35PSI, and the desired temperature of extruder is respectively 130,160,190,200,220,220,220,220,220,220,220,220,220,220,220,220,220,220 ℃.
Seven, thickness measure and adjustment
Utilize the beta-ray measurement instrument to measure the thickness of pre-coating film, after the measurement its result is fed back to computer, the die lip aperture at the screw speed of computer control extruder and die head position is so that obtain the pre-coating film of thickness uniformity.Base material 1, intermediate layer 2 and hot melt adhesive layer 3 gross thickness are 40 microns.
The beta-ray measurement instrument is provided by U.S. NDC company, and model is 6100TC/300.
Eight, sided corona treatment
Sided corona treatment is carried out on hot melt adhesive layer 3 (EVA/EMA) surface, and to obtain a certain amount of polar group, reaching hot melt adhesive layer 2 surperficial dyne values is 54.
Nine, rolling
Pre-coating film harvest coiled material after utilizing winder with corona.
Ten, cut
According to client's demand, the pre-coating film of winder harvest coiled material is cut into the volume of cutting of required width of client and length.Obtain bidirectional stretching polypropylene film (BOPP) viscosity-increasing precoating film.
Both sides of the edge accumulative total is cut off 20mm, and final products will be than about the narrow 20mm of base material, in the fabric width direction, and thickness deviation≤2 micron.
Embodiment 2: with width is that 1795 millimeters biaxial stretching polyester (BOPET) viscosity-increasing precoating film is an example, describes
Embodiment 2 is substantially the same manner as Example 1, and difference is:
Base material 1 employing width is 1795 millimeters biaxial stretching polyester (BOPET) viscosity-increasing precoating film, and the thickness of base material 1 is 9 microns;
After the unreeling of completing steps two, directly carry out the coating intermediate layer 2 of step 4, omit the sided corona treatment process of step 3;
The ethylene-vinyl acetate of hot melt adhesive layer 3 (EVA) with the percentage by weight of ethylene-methyl acrylate copolymer (EMA) is: ethylene-vinyl acetate (EVA) is 61%, ethylene-methyl acrylate copolymer (EMA) is 39%, and the thickness of composite hot melt glue-line 3 is 25 microns.
Base material 1, intermediate layer 2, hot melt adhesive layer 3 gross thickness are 34 microns.
Through extruding, stretching, cooling, the deburring system of nip roller, both sides of the edge accumulative total can be cut off 25mm after compound, and final products will be than about the narrow 25mm of base material, in the fabric width direction, and thickness deviation≤2 micron.
Pre-coating film of the present invention its cohesive force to printed matter in the finished product application process will be far longer than common pre-coating film.The row contrast table describes.

Claims (7)

1, a kind of viscosity-increasing precoating film of biaxial tension is characterized in that: be made up of base material (1), intermediate layer (2) and hot melt adhesive layer (3), wherein: base material (1) adopts Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film; Intermediate layer (2) is that the solid content of coating is aqueous solution polymine (PEI) aqueous solution of 0.7%-1.2%, and coated weight is 0.01g/m 2, polymine after the drying (PEI) is evenly distributed on described film surface; Hot melt adhesive layer (3) is the mixture that ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) constitute, VA content in the ethylene-vinyl acetate (EVA) is 15-20%, melt index is 11-20g/10min, the melt index of ethylene-methyl acrylate copolymer (EMA) is 15-20g/10min, the mixed proportion of the two: ethylene-vinyl acetate (EVA) is 50-70%, ethylene-methyl acrylate copolymer (EMA) is 30-50%, base material (1), intermediate layer (2) and hot melt adhesive layer (3) gross thickness are the 29-45 micron, wherein the thickness of base material (1) is the 9-15 micron, the thickness 20-30 micron of hot melt adhesive layer (3).
2, according to the described viscosity-increasing precoating film of biaxial tension of claim 1, it is characterized in that: base material (1) is Biaxially oriented polypropylene (BOPP) film, and thickness is the 12-15 micron; The ethylene-vinyl acetate (EVA) of hot melt adhesive layer (3) with the percentage by weight of ethylene-methyl acrylate copolymer (EMA) is: ethylene-vinyl acetate (EVA) is 52%, ethylene-methyl acrylate copolymer (EMA) is 48%, VA content in the ethylene-vinyl acetate (EVA) is 18%, melt index is 15g/10min, the melt index of ethylene-methyl acrylate copolymer (EMA) is 17g/10min, the thickness of hot melt adhesive layer (3) is 25 microns, and base material (1), intermediate layer (2) and hot melt adhesive layer (3) gross thickness are the 37-40 micron.
3, according to the described viscosity-increasing precoating film of biaxial tension of claim 1, it is characterized in that: base material (1) is biaxial stretching polyester (BOPET) film, and thickness often is the 9-12 micron; The ethylene-vinyl acetate (EVA) of hot melt adhesive layer (3) with the percentage by weight of ethylene-methyl acrylate copolymer (EMA) is: ethylene-vinyl acetate (EVA) is 61%, ethylene-methyl acrylate copolymer (EMA) is 39%, VA content in the ethylene-vinyl acetate (EVA) is 18%, and melt index is 15g/10min; The melt index of ethylene-methyl acrylate copolymer (EMA) is 17g/10min, and the thickness of hot melt adhesive layer (3) is 25 microns, and base material (1), intermediate layer (2) and hot melt adhesive layer (3) gross thickness are the 34-37 micron.
4, according to the described viscosity-increasing precoating film of biaxial tension of claim 1, it is characterized in that: the molecular formula of polymine (PEI): be (CH 2CH 2NH) n, select the n value in the scope of 1000-10000 according to the mean molecule quantity of polymer.
5, according to the described viscosity-increasing precoating film of biaxial tension of claim 1, it is characterized in that: intermediate layer (2) are that the solid content of coating is polymine (PEI) aqueous solution and the crude alcohol mixture of 0.7%-1.2%, the weight ratio of 0.95% polymine (PEI) aqueous solution and alcohol is 20: 1-1.3 stirs.
6, as the processing method of claim 1,2,3,4 or 5 described viscosity-increasing precoating film of biaxial tension, it is characterized in that:
One, the preparation of intermediate layer materials and hot melt adhesive layer materials
The preparation of A, intermediate layer (2) materials: with solid content is that to be deployed into solid content be 0.95% polymine (PEI) aqueous solution for 5% polymine (PEI) aqueous solution, add alcohol (analyzing pure) again, the weight ratio of 0.95% polymine (PEI) aqueous solution and alcohol is 20: 1, stirs to obtain intermediate layer (2) materials;
The preparation of B, hot melt adhesive layer (3) materials: with ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) according to percentage by weight be: ethylene-vinyl acetate (EVA) is 50-70%, ethylene-methyl acrylate copolymer (EMA) is 30-50%, add in the homogenizer and mix about 1-5 of the time that mixes minute;
Two, unreel
With Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film substrate (1) volume, be placed on the unreeling machine and and unreel by the inflatable axle;
Three, corona
Sided corona treatment is carried out on surface to preparation coating polyethylene imines (PEI) aqueous solution of Biaxially oriented polypropylene (BOPP) film, and the dyne value that reaches Biaxially oriented polypropylene (BOPP) film surface is 36;
Four, apply the intermediate layer
By the silane coupling agent coating equipment, surface or surface of biaxial stretching polyester (BOPET) film in Biaxially oriented polypropylene (BOPP) film sided corona treatment evenly apply intermediate layer (2) materials that one deck has configured, and the quantity that applies intermediate layer (2) materials is 0.01g/m 2
Five, oven dry
Utilize drying plant will be coated with Biaxially oriented polypropylene (BOPP) film or the oven dry of biaxial stretching polyester (BOPET) film of polymine (PEI) aqueous solution, make polymine (PEI) be solidificated in Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film surface, bake out temperature is 85-95 ℃, and the thickness in oven dry intermediate layer, back (2) is about the 0.01-0.03 micron;
Six, composite hot melt glue-line
Be loaded with Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film of drying polymine (PEI), be sent to compound position by the deflector roll of extruding composite production line, extruder extruding and hot melting glue-line (3) is with expecting on Biaxially oriented polypropylene (BOPP) film or biaxial stretching polyester (BOPET) film; On the next door, compound position of extruding composite production line ozone generator is arranged, ethylene vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) mixture curtain coating place that the ozone that is produced by ozone generator is jetted and extruded to extruder, the concentration of ozone is 40%, power 800W, gas flow is 3.5SCXFM, ozone makes ethylene-vinyl acetate (EVA) and ethylene-methyl acrylate copolymer (EMA) curtain coating surface produce some polar groups, the extruding of Biaxially oriented polypropylene (BOPP) film that is loaded with polymine (PEI) then and the curtain coating nip roller by extruding the compound position of composite production line combines, form composite membrane, stretched again, cooling, after the deburring, be admitted to calibrator and detect;
The pressure of nip roller is 35PSI, and the desired temperature of extruder is respectively 130,160,190,200,220,220,220,220,220,220,220,220,220,220,220,220,220,220 ℃;
Seven, thickness measure and adjustment
Utilize the beta-ray measurement instrument to measure the thickness of pre-coating film, after the measurement its result is fed back to computer, the die lip aperture at the screw speed of computer control extruder and die head position is so that obtain the pre-coating film of thickness uniformity;
Eight, sided corona treatment
Hot melt adhesive layer (3) (EVA/EMA) is carried out sided corona treatment in the surface,, reach the surperficial dyne value of hot melt adhesive layer (2) in the 50-54 scope to obtain a certain amount of polar group;
Nine, rolling
Pre-coating film harvest coiled material after utilizing winder with corona;
Ten, cut
According to client's demand, the pre-coating film of winder harvest coiled material is cut into the volume of cutting of required width of client and length;
Obtain viscosity-increasing precoating film of biaxial tension.
7, the processing method of viscosity-increasing precoating film of biaxial tension as claimed in claim 6 is characterized in that: the unit type that step 3 is used is TF1006; The equipment that step 4 and step 5 are used is (COATER/DRYER) S.O.#C/A-1125-04; The beta-ray measurement instrument model that step 7 is used is 6100TC/300.
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