WO2014005533A1 - 双向拉伸数码预涂膜及其制备方法 - Google Patents

双向拉伸数码预涂膜及其制备方法 Download PDF

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Publication number
WO2014005533A1
WO2014005533A1 PCT/CN2013/078832 CN2013078832W WO2014005533A1 WO 2014005533 A1 WO2014005533 A1 WO 2014005533A1 CN 2013078832 W CN2013078832 W CN 2013078832W WO 2014005533 A1 WO2014005533 A1 WO 2014005533A1
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WO
WIPO (PCT)
Prior art keywords
layer
coating
melt adhesive
hot melt
biaxially stretched
Prior art date
Application number
PCT/CN2013/078832
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English (en)
French (fr)
Inventor
钟玉
Original Assignee
北京康得新复合材料股份有限公司
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Publication of WO2014005533A1 publication Critical patent/WO2014005533A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2477/00—Presence of polyamide
    • C09J2477/006—Presence of polyamide in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2479/00—Presence of polyamine or polyimide
    • C09J2479/02—Presence of polyamine or polyimide polyamine
    • C09J2479/026—Presence of polyamine or polyimide polyamine in the substrate

Definitions

  • the invention relates to the technical field of digital printed film covering, in particular to a biaxially stretched digital precoating film for a digital printing product with high silicone oil and high wax content and a preparation method thereof.
  • the laminating process can not only protect the printed matter, prolong its service life, but also improve the appearance of the printed matter. It is widely used in books, food, tobacco, alcohol, medicine and other packaging.
  • the coating process is divided into a coating film coating process and a precoat film coating process, wherein the precoat film obtained by the precoat film coating process is not used during production and use, compared with the film coating process.
  • a volatile, flammable, and explosive organic solvent that does not produce toxic gases, thus effectively improving the working environment and improving safety.
  • the entire lamination process can be completed in a few seconds and is easy to operate.
  • pre-coated film can cover many printing and packaging fields, but some special fields require pre-coated films with special functions to adapt.
  • many inks used in the surface of printed matter contain silicone oil or wax, silicone oil and The wax has a large inorganic component content, and it is not easy to combine with the hot melt adhesive in the ordinary precoat film when the film is coated.
  • the bonding fastness between the printed film and the film after the film is insufficient, which causes many quality defects, such as rolling after film coating.
  • the layer appears at the line and embossing, that is, the film is separated from the printed matter.
  • the present invention aims to solve at least one of the technical problems existing in the prior art.
  • the present invention proposes a biaxially stretched digital precoat film which has high adhesion so as to have high adhesion to a silicone print or a digital print having a high wax content.
  • a biaxially stretched digital precoat film comprising: a substrate layer: a hot melt adhesive layer, an intermediate layer, the intermediate layer being disposed between the substrate layer and the hot melt adhesive layer a primer layer, the primer layer is disposed on a side of the hot melt adhesive layer away from the substrate layer; an adhesion promoting layer, wherein the adhesion promoting layer is disposed on the base layer away from the substrate layer Side.
  • the adhesion promoting layer can have a good adhesion to a silicone print or a digital print having a high wax content
  • the precoated film according to the present invention can penetrate deep into the paper fibers to achieve a firm bond with the paper.
  • an undercoat layer is applied to the surface of the hot melt adhesive layer to firmly bond the adhesion promoting layer and the hot melt adhesive layer.
  • the substrate layer is a biaxially stretched film
  • the hot melt adhesive layer is made of copolymerized polyethylene
  • the substrate layer comprises a biaxially oriented polyester (BOPET) film, a biaxially oriented polypropylene (BOPP) film, Or a biaxially stretched nylon (BOPA) film having a thickness of 10 ⁇ m to 50 ⁇ m ;
  • the hot melt adhesive layer is one or more of the following materials: ethylene-vinyl acetate (EVA) copolymerization , ethylene-ethyl acrylate (EEA) copolymer, ethylene-acrylic acid (EAA) copolymer, ethylene-methyl acrylate (EMA) copolymer, and low density polyethylene (LDPE), thickness of the hot melt adhesive layer It is from 10 ⁇ m to 50 ⁇ m.
  • EVA ethylene-vinyl acetate
  • EAA ethylene-ethyl acrylate
  • EAA ethylene-acrylic acid
  • EMA ethylene-methyl acrylate
  • LDPE low density polyethylene
  • the intermediate layer is made of polyethyleneimine (PEI), and the molecular formula of polyethyleneimine (PEI) is: (CH2CH2NH)n, wherein the value of n is from 1000 to 10000 according to the average molecular weight of the polymer. Choose within the scope.
  • the intermediate layer is made of a polyethyleneimine (PEI) aqueous solution having a solid content of 0.4% to 1.5%, and the intermediate layer has a thickness of 0.01 ⁇ m to 0.03 ⁇ m and a coating dry weight of 0.009 g/m. 2 ⁇ 0.011g / m 2 .
  • PEI polyethyleneimine
  • the undercoat layer is an aqueous surface treatment agent containing an antifoaming agent
  • the adhesion promoting layer is an organic or inorganic adhesive containing an antifoaming agent and a leveling agent.
  • the primer layer is an amine surface treatment agent or a coupling agent containing 1% to 10% by mass of an antifoaming agent
  • the thickness of the undercoat layer is 0.01 ⁇ ⁇ to 0.07 ⁇ . ⁇ , coated dry weight of 0.02g / m 2 ⁇ 0.05g / m 2
  • the adhesion promoting layer using copolyester adhesive and containing 2% ⁇ 10% (mass percent) of a defoaming agent, And comprising 0.1% to 1.5% of a leveling agent, the adhesion promoting layer having a thickness of 0.05 ⁇ to 0.6 ⁇ , and a coating dry weight of 0.2 g/m 2 to 0.6 g/m 2 .
  • the undercoat layer is made of an amine surface treatment agent having a solid content of 0.1% to 5%, which contains 4% to 8% of an antifoaming agent, and the thickness of the undercoat layer is 0.02 ⁇ ⁇ to 0.06 ⁇ ⁇ , coated dry weight of 0.02g / m 2 ⁇ 0.04g / m 2 ; the adhesion promoting layer using a solid content of 1% ⁇ 20% of the copolyester adhesive, containing 4% ⁇ 7% and extinction a foaming agent, and a leveling agent containing 0.5% to 1%, the adhesion promoting layer having a thickness of 0.1 ⁇ m to 0.5 ⁇ m and a coating dry weight of 0.2 g/m 2 to 0.5 g/m 2 .
  • the present invention has the following beneficial effects:
  • the invention also proposes a preparation method of a biaxially stretched digital precoat film, comprising the following steps:
  • Step a placing the substrate layer on the unwinder for unwinding
  • Step b coating the intermediate layer on the composite surface of the substrate layer by roll coating, and performing drying and curing treatment;
  • Step c hot melt adhesive is extruded through an extruder and applied to the middle by roll coating The surface of the layer away from the substrate layer, Cooling treatment;
  • Step e The adhesion promoting layer is covered on the surface of the undercoat layer by a roll coating method, and is subjected to drying and solidification treatment to be wound up;
  • Step f The wound pre-coated film is cut into a predetermined specification.
  • FIG. 1 is a schematic view of a biaxially stretched digital precoat film according to an embodiment of the present invention
  • FIG. 2 is a schematic illustration of a process system for biaxially stretching a digital precoat film in accordance with an embodiment of the present invention.
  • first and second are used for descriptive purposes only, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defining “first”, “second” may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, “multiple” means two or more unless otherwise stated.
  • a biaxially stretched digital precoat film comprising a substrate layer 01, a hot melt adhesive layer 03, an intermediate layer 02, an undercoat layer 04, and an adhesion promoting layer 05.
  • the intermediate layer 02 is composited with the substrate layer 01, and the hot melt adhesive layer 03 is disposed in the intermediate layer 02 It is away from the side of the substrate layer 01.
  • the undercoat layer 04 is provided on the side of the hot melt adhesive layer 03 away from the substrate layer 01.
  • the adhesion promoting layer 05 is provided on one side of the undercoat layer 04 away from the substrate layer 01.
  • the adhesion promoting layer can have a good adhesion to a silicone print or a digital print having a high wax content
  • the precoated film according to the present invention can penetrate deep into the paper fibers to achieve a firm bond with the paper.
  • the adhesion between the adhesion promoting layer and the hot melt adhesive layer can be improved, and the adhesion promoting layer and the hot melt adhesive layer can be firmly bonded.
  • the substrate layer 01 is a biaxially stretched film
  • the hot melt adhesive layer 03 is made of copolymerized polyethylene.
  • the biaxially oriented film includes a biaxially stretched polyester (BOPET) film or a biaxially stretched nylon (BOPA) film or a biaxially oriented polypropylene (BOPP) film.
  • Biaxially stretched polyester (BOPET) film has the following advantages: 1 good mechanical properties, good rigidity, high strength; 2 excellent cold resistance, heat resistance, temperature range of -70 ⁇ 150 °C ; 3 good resistance Water, gas barrier and fragrance; 4 resistant to grease and most solvents, weak acid alkaline liquid.
  • biaxially stretched nylon (BOPA) film Compared with other traditional films, biaxially stretched nylon (BOPA) film has the advantages of good transparency, high gloss, strong odor barrier, strong oil and heat resistance, and at the same time, since BOPA film is non-toxic and harmless, it has become A popular material in the food packaging industry, especially suitable for freezing, cooking, vacuum packaging.
  • the biaxially oriented polypropylene (BOPP) film is generally a multi-layered mutual-compatibility film which is obtained by co-extruding polypropylene particles into a sheet and then stretching in both directions, due to stretching molecular orientation. Therefore, the film has good physical stability, mechanical strength, air tightness, high transparency and gloss, and is tough and wear resistant.
  • the molten hot melt adhesive is light yellow or colorless and consists of basic resin, tackifier, viscosity modifier and antioxidant.
  • the hot melt adhesive layer uses ethylene-vinyl acetate (EVA) copolymer, ethylene-ethyl acrylate (EEA) copolymer, ethylene-acrylic acid (EAA) copolymer, ethylene-methyl acrylate (EMA) copolymer, low density One or a mixture of polyethylene (LDPE).
  • the substrate layer 01 has a thickness of 10 ⁇ m to 50 ⁇ m
  • the hot melt adhesive layer 03 has a thickness of 10 ⁇ m to 50 ⁇ m. More preferably, the thickness of the substrate layer 01 is 12 ⁇ to 30 ⁇ , and the thickness of the hot melt adhesive layer 03 is 10 ⁇ to 30 ⁇ .
  • the intermediate layer 02 is made of polyethyleneimine (poly) and polyethyleneimine ( ⁇ ) having the formula: (CH2CH2NH)n, wherein the value of n is in the range of 1000 to 10000 depending on the average molecular weight of the polymer. Internal selection. Further, the intermediate layer 02 is made of a polyethyleneimine (PEI) aqueous solution having a solid content of 0.4% to 1.5%, and the intermediate layer has a thickness of 0.01 ⁇ m to 0.03 ⁇ m, and a coating dry weight of 0.009 g/m 2 to 0.01 lg. /m 2 .
  • PEI polyethyleneimine
  • the undercoat layer 04 is an aqueous surface treatment agent containing an antifoaming agent, and the adhesion promoting layer 05 is an organic or inorganic adhesive containing an antifoaming agent and a leveling agent. Further, the undercoat layer 04 is an amine surface treatment agent or a coupling agent containing 1% to 10% of an antifoaming agent, and the undercoat layer 04 has a thickness of 0.01 ⁇ m to 0.07 ⁇ m, and a coating dry weight of 0.02. g / m 2 ⁇ 0.05g / m 2 .
  • the adhesion promoting layer 05 is made of a copolyester adhesive and contains 2% to 10% of an antifoaming agent, and contains 0.1% to 1.5% of a leveling agent.
  • the thickness of the adhesion promoting layer 05 is 0.05 ⁇ m to 0.6 ⁇ m. It has a coating dry weight of 0.2 g/m 2 to 0.6 g/m 2 .
  • the undercoat layer 04 is made of an amine surface treatment agent having a solid content of 0.1% to 5%, which contains 4% to 8% of an antifoaming agent, and the thickness of the undercoat layer 04 is 0.02 ⁇ to 0.06. ⁇ , its coating dry weight is 0.02g / m 2 to 0.04 g/m 2 .
  • the adhesion promoting layer 05 is made of a copolyester adhesive having a solid content of 1% to 20%, and contains 4% to 7% of an antifoaming agent, and a leveling agent containing 0.5% to 1%, and an adhesion promoting layer 05.
  • the thickness is from 0.1 ⁇ m to 0.5 ⁇ m, and the coating weight thereof is from 0.2 g/m 2 to 0.5 g/m 2 .
  • the substrate layer 01, the hot melt adhesive layer 03, the intermediate layer 02, the undercoat layer 04, and the adhesion promoting layer 05 have the same width.
  • the biaxially stretched digital precoat film of the present invention will be further described below in conjunction with the accompanying drawings and by way of specific embodiments.
  • Embodiment 1 will be further described below in conjunction with the accompanying drawings and by way of specific embodiments.
  • a biaxially stretched digital precoat film comprises a substrate layer 01, and one side of the substrate layer is sequentially provided with an intermediate layer 02, a hot melt adhesive layer 03, an undercoat layer 04, and a paste. Junction promoting layer 05.
  • the substrate layer 01, the intermediate layer 02, the hot melt adhesive layer 03, the undercoat layer 04, and the adhesion promoting layer 05 each have a width of 1600 mm.
  • the substrate layer 01 is a biaxially oriented polypropylene (BOPP) film
  • the intermediate layer 02 is a polyethyleneimine (PEI) aqueous solution having a solid content of 1%
  • the hot melt adhesive layer 03 is an ethylene-vinyl acetate (EVA) hot melt adhesive.
  • the undercoat layer 04 is an amine surface treatment agent having a solid content of 2.5%, which contains 6% of an antifoaming agent
  • the adhesion promoting layer is made of a copolyester adhesive having a solid content of 10% and containing 5% defoaming agent. Agent, 0.8% leveling agent.
  • Step a Unwinding the substrate layer
  • a film of 15 ⁇ m thickness biaxially oriented polypropylene (BOPP) is placed on the unwinder 1 and unwound through an inflation shaft to unfold it;
  • Step b Coating the middle layer
  • the composite surface Before the intermediate layer of the substrate layer is coated with the intermediate layer, the composite surface should be surface treated according to the situation; when the substrate layer is made of biaxially oriented polypropylene (BOPP) film, the composite surface needs to be corona treated; Biaxially oriented polypropylene (BOPP) film is a non-polar material, and its surface does not have good cohesiveness, that is, its surface wetting tension is small, so the biaxially stretched polyene (BOPP) film must be corona treated. In order to bond it well to the intermediate interlayer polyethyleneimine (PEI) aqueous solution, it is necessary to subject its surface to corona pretreatment to obtain a polar group having a certain activity.
  • PEI polyethyleneimine
  • biaxially oriented polypropylene (BOPP) film to a surface coated with a polyethyleneimine (PEI) aqueous solution (a surface bonded to PEI) to be corona treated to obtain a certain amount of a pole such as a carbonyl group.
  • PEI polyethyleneimine
  • the group, the degree of corona treatment is indicated by the wetting tension (dym value), and the dyne value of the surface of the biaxially oriented polypropylene (BOPP) film is preferably 36; when the substrate layer is biaxially stretched polyester (BOPET) film or biaxially stretched nylon (BOPA) film, since both biaxially stretched polyester (BOPET) film and biaxially stretched nylon (BOPA) film are polar materials, corona treatment is not required.
  • Corona treatment is a high frequency and high voltage electric spark treatment to break the chain molecules on the surface of the biaxially stretched film, and the chain breaks.
  • the free radical generated and the air corona product undergo oxidation and cross-linking reaction, and a polar group is generated on the surface of the biaxially stretched film, and a part of the polar group is injected into the film to roughen the surface, thereby increasing the surface tension of the film.
  • the corona treatment is carried out by the corona processor 2, and the specific operation process is well known to those skilled in the art and will not be described in detail.
  • the first coating roll 4 coats the polyethyleneimine (PEI) aqueous solution in the first coating tank 3 on the corona-treated surface of the biaxially oriented polypropylene (BOPP) film.
  • PEI polyethyleneimine
  • the drying temperature is preferably about 85 ° C to 95 ° C.
  • the two-way drawing of the polyethyleneimine (PEI) aqueous solution is applied.
  • the stretched polypropylene (BOPP) film is dried through the drying channel 5, and then cooled by the cooling roll 6.
  • the thickness of the intermediate layer is 0.01 ⁇ m to 0.03 ⁇ m, preferably 0.015 ⁇ m, and the dry weight is 0.009 g/ m 2 to 0.011 g/m 2 .
  • Step c composite hot melt adhesive layer
  • Extrusion machine 8 of the extrusion compound line extrudes ethylene-vinyl acetate (EVA) hot melt adhesive, and an ozone generator 7 is arranged at the compound station of the production line, and ozone is sprayed by the ozone generator 7 to the extrusion.
  • the casting of the hot melt adhesive, and the guide roller of the production line transports the already dried polyethyleneimine-coated biaxially oriented polypropylene (BOPP) film to the composite station, and the heat that is cast to the composite station
  • the melt glue is pressed and combined by the engaging roller 9 to form a composite film, which is then cooled by a cooling roll 6 (at a temperature of 18 ° C), and the thickness of the hot melt adhesive layer is 25 ⁇ m ;
  • the concentration of ozone generated by the ozone generator is preferably 40%, the power is 800W, and the gas flow rate is 3.5SCXFM.
  • the ozone can generate some polar groups on the surface of the hot melt adhesive casting;
  • Thickness measurement and adjustment The thickness is measured by the strong penetration and accurate measurement performance of the ⁇ -ray in a short distance. After the measurement, the result is fed back to the computer, and the screw speed and the die head of the extruder are controlled by the computer. The lip opening of the bit is used to obtain a pre-coated film having the same thickness.
  • Step d Apply the undercoat
  • first corona surface treatment is performed on the surface of the hot melt adhesive layer by corona processor 2, and the surface value of the hot melt adhesive layer is in the range of 36 ⁇ 38;
  • the second coating roller 11 coats the amine surface treatment agent primer coating in the second coating tank 10 on the surface of the hot melt adhesive, and then performs drying treatment through the drying channel 5, after drying.
  • the thickness of the undercoat layer is 0.03 ⁇ ;
  • Step e Coating the adhesion promoting layer
  • the third coating roller 13 coats the copolyester adhesive adhesion promoting layer in the third coating tank 12 on the surface of the undercoat layer, and then performs drying treatment through the drying channel 5, after drying
  • the adhesion promoting layer has a thickness of 0.4 ⁇ m, and is then collected into a coil by a winder 14;
  • Step f Slitting
  • Embodiment 2 The edges of the pre-coated film of the rolled coil were cut off by 20 mm, and the final product width was 1580 mm, the thickness was 40.445 ⁇ m, and the thickness deviation was 2 ⁇ .
  • Embodiment 2 The edges of the pre-coated film of the rolled coil were cut off by 20 mm, and the final product width was 1580 mm, the thickness was 40.445 ⁇ m, and the thickness deviation was 2 ⁇ .
  • a biaxially stretched digital precoat film comprising a substrate layer 01, one side of a substrate layer is sequentially provided with an intermediate layer 02, a hot melt adhesive layer 03, an undercoat layer 04, and an adhesion promoting layer. 05.
  • the substrate layer 01, the intermediate layer 02, the hot melt adhesive layer 03, the undercoat layer 04, and the adhesion promoting layer 05 each have a width of 1600 mm.
  • the substrate layer 01 is a biaxially stretched nylon (BOPA) film
  • the intermediate layer 02 is made of a polyethyleneimine (PEI) aqueous solution having a solid content of 1%
  • the hot melt adhesive layer 03 is made of ethylene vinyl acetate (EVA) and ethylene.
  • EVA ethylene vinyl acetate
  • EMA methyl acrylate copolymer
  • the ethylene-vinyl acetate (EVA) has a VA content of 18%, a melt index of 15 g/10 min, an ethylene-methyl acrylate copolymer (EMA) melt index of 17 g/10 min , and a base coat 04 with a solid content of 2.5. % of an amine surface treatment agent containing 6% defoamer, the adhesion promoting layer is a copolyester adhesive with a solid content of 10%, and contains 5% defoamer and 0.8% leveling agent.
  • a biaxially stretched nylon ( ⁇ ) film having a thickness of 15 ⁇ m is placed on a unwinder and unwound through an inflation shaft; step b: coating the intermediate layer
  • the first coating roller coats the polyethyleneimine (PEI) aqueous solution in the first coating tank on the surface of the biaxially stretched nylon (BOPA) film;
  • PEI polyethyleneimine
  • biaxially stretched nylon (BOPA) film coated with an aqueous solution of polyethyleneimine (PEI) is dried through a drying tunnel and then cooled by a cooling roll. After drying, the thickness of the intermediate layer is 0.015 ⁇ m, dry weight. It is between 0.009 g/m 2 and 0.01 g/m 2 ;
  • the extruder of the extrusion compounding line extrudes the hot melt adhesive
  • an ozone generator is arranged at the compound station of the production line, and the ozone generator generates ozone to be sprayed to the casting place of the extruded hot melt adhesive
  • the guide roller of the production line transports the dried biaxially stretched nylon (BOPA) film compounded with polyethyleneimine to the composite station, and combines with the hot melt adhesive cast to the composite station through the engaging roller to form
  • the composite film is further cooled by a cooling roll (temperature is 18 ° C), and the thickness of the hot melt adhesive layer is 25 ⁇ ;
  • first corona surface treatment is performed on the surface of the hot melt adhesive layer by the corona processor 2, and the surface value of the hot melt adhesive layer is in the range of 50 to 54;
  • the second coating roller 11 coats the amine surface treatment agent primer coating in the second coating tank 10 on the surface of the hot melt adhesive, and then performs drying treatment through the drying channel 5, after drying.
  • the thickness of the undercoat layer is 0.03 ⁇ ;
  • Step f Slitting
  • the invention combines the adhesion promoting layer on the side of the hot melt adhesive layer, has good adhesion with the printed matter, and can penetrate into the paper fiber to achieve firm bonding with the paper; and in the hot melt adhesive layer and adhesion promotion
  • the undercoat layer is disposed between the layers to improve the adhesion between the adhesion promoting layer and the hot melt adhesive layer, and the adhesion promoting layer and the hot melt adhesive layer are firmly combined; 2.
  • the adhesion promoting layer is in contact with the printed matter
  • the outermost adhesion promoting layer can penetrate into the printed matter, and then diffuse to the paper substrate, forming a network cross-linked structure with the paper fibers, and is particularly suitable for use in a digital printing proof with a heavy content of silicone oil and wax, and the adhesion promoting layer can penetrate into
  • the ink layer of digital prints has ultra-high adhesion properties to digital prints.
  • the experimental data is shown in the following table:

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Abstract

一种双向拉伸数码预涂膜及其制备方法。所述双向拉伸数码预涂膜包括：基材层（01）：热熔胶层（02），所述热熔胶层（02）与所述基材层（01）复合；中间层（03），所述中间层（03）设在所述基材层（01）与所述热熔胶层（02）之间；底涂层（04），所述底涂层（04）设在所述热熔胶层（02）上的远离基材层（01）的一面；粘结促进层（05），所述粘结促进层（05）设在所述底涂层（04）的远离基材层（01）的一面。

Description

双向拉伸数码预涂膜及其制备方法
技术领域
本发明涉及数码印刷品覆膜技术领域， 尤其涉及一种针对硅油、 蜡含量高的数码印 刷品的双向拉伸数码预涂膜及其制备方法。 背景技术
覆膜工艺不仅可以对印刷品提供保护作用， 延长其使用寿命， 还可以提高印刷品的 外观效果， 广泛的应用于书刊、 食品、 烟酒、 药品等包装上。 覆膜工艺分为即涂膜覆膜 工艺与预涂膜覆膜工艺， 其中相比于即涂膜覆膜工艺， 预涂膜覆膜工艺得到的预涂膜在 生产及使用过程中， 不使用易挥发、 易燃、 易爆的有机溶剂， 不产生有毒气体， 因此， 有效改善了工作环境， 提高了安全性能。 整个覆膜过程可以在几秒钟完成， 操作方便。
预涂膜的应用可以覆盖很多印刷、 包装领域， 但是有些特殊的领域就需求具有特殊 功能的预涂膜来适应， 针对数码印刷品领域， 由于很多印刷品表面使用的油墨中含有硅 油或蜡， 硅油与蜡的无机物成分含量大， 覆膜时不易与普通的预涂膜中的热熔胶结合， 覆膜后印刷品与膜的结合牢度不够， 会造成很多质量缺陷， 例如在覆膜后的轧线、 压纹 处出现起层， 即膜与印刷品相分离现象。
因此， 必须设计新型材料和生产方法， 以适应重硅油或重蜡油墨印刷品覆膜需求。 发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。 由此， 本发明提出了一种双 向拉伸数码预涂膜， 所述预涂膜具有高粘结性以便与硅油、蜡含量高的数码印刷品粘结 牢度高。
根据本发明实施例的一种双向拉伸数码预涂膜， 包括： 基材层： 热熔胶层， 中间层， 所述中间层设在所述基材层与所述热熔胶层之间； 底涂层， 所述底涂层设在所述热熔胶层 上的远离基材层的一面； 粘结促进层， 所述粘结促进层设在所述底涂层的远离基材层的一 面。
由于粘结促进层可以跟硅油、 蜡含量高的数码印刷品有很好的粘结力， 由此， 根据 本发明的预涂膜可以深入纸张纤维， 实现与纸张牢固结合。 另外， 为了提高粘结促进层 与热熔胶层之间的粘结性， 从而在热熔胶层的表面涂覆底涂层， 以将粘结促进层与热熔 胶层牢固结合。
根据本发明的一个实施例， 所述基材层采用双向拉伸薄膜， 所述热熔胶层采用共聚聚 乙烯。
可选地， 所述基材层包括双向拉伸聚酯 (BOPET)薄膜、 双向拉伸聚丙烯 (BOPP)薄膜、 或者双向拉伸尼龙 （BOPA) 薄膜， 所述基材层的厚度为 10 μ ηι〜50 μ ηι; 所述热熔胶层采 用以下材料的一种或几种： 乙烯-醋酸乙烯 （EVA) 共聚物、 乙烯 -丙烯酸乙酯 （EEA) 共聚 物、乙烯-丙烯酸 (EAA)共聚物、乙烯 -丙烯酸甲酯 (EMA)共聚物、以及低密度聚乙烯 (LDPE)， 所述热熔胶层的厚度为 10 μ m〜50 μ m。
根据本发明的一个实施例， 所述中间层采用聚乙烯亚胺 （PEI)， 聚乙烯亚胺 （PEI) 的分子式： （CH2CH2NH)n， 其中 n值根据聚合物的平均分子量在 1000〜10000的范围内选 择。
可选地，所述中间层采用固含量为 0.4%〜1.5 %的聚乙烯亚胺 (PEI)水溶液， 中间层的厚 度为 0.01 μ m〜0.03 μ m， 其涂覆干重为 0.009g/m2〜0.011g/m2。
根据本发明的一个实施例， 所述底涂层采用含有消泡剂的水性表面处理剂， 所述粘结 促进层采用含有消泡剂及流平剂的有机或者无机胶黏剂。
可选地， 所述底涂层采用胺类表面处理剂或者偶联剂， 其含有 1 %〜10% (质量百分 比） 的消泡剂， 所述底涂层的厚度为 0.01 μ ηι〜0.07 μ ηι， 其涂覆干重为 0.02g/m2〜0.05g/ m2 ; 所述粘结促进层采用共聚酯类胶黏剂， 并含有 2%〜10% (质量百分比） 的消泡剂， 以 及含有 0.1 %〜 1.5 %的流平剂， 所述粘结促进层的厚度为 0.05 μ ηι〜0.6 μ ηι， 其涂覆干重为 0.2g/m2〜0.6g/m2。
进一步地， 所述底涂层采用固含量 0.1 %〜5 %的胺类表面处理剂， 其含有 4%〜8 %的 消泡剂， 所述底涂层的厚度为 0.02 μ ηι〜0.06 μ ηι， 其涂覆干重为 0.02g/m2〜0.04g/m2 ; 所述 粘结促进层采用固含量 1 %〜20%的共聚酯类胶黏剂， 并含有 4%〜7%的消泡剂， 以及含 有 0.5 %〜1 %的流平剂，所述粘结促进层的厚度为 0.1 μ m〜0.5 μ m，其涂覆干重为 0.2g/m2〜 0.5g/m2。
根据本发明的一个实施例， 所述基材层、 所述中间层、 所述热熔胶层、 所述底涂层、 所述粘结促进层的宽度均相同。
相对于现有技术， 本发明具有以下有益效果：
1、 本发明通过在热熔胶层一侧复合粘结促进层， 可以跟印刷品有很好的粘结力， 并可以深入纸张纤维， 实现与纸张牢固结合； 而在热熔胶层与粘结促进层之间设置底涂 层， 提高了粘结促进层与热熔胶层之间的粘结性， 实现了粘结促进层与热熔胶层牢固结 合.
2、 粘结促进层中与印刷品接触的最外侧粘结促进层可渗透印刷品内， 进而扩散到 纸张基材， 与纸张纤维形成网状交联结构， 尤其适合应用于硅油、 蜡含量重的数码打印 样张， 粘结促进层可渗透进数码印刷品的油墨层， 对数码印张具有超高粘接特性。
本发明还提出了一种双向拉伸数码预涂膜的制备方法， 包括如下步骤：
步骤 a: 将基材层安放于放卷机上进行放卷；
步骤 b: 在基材层的复合面采用辊涂方式均勾涂覆中间层， 并进行烘干固化处理； 步骤 c: 热熔胶通过挤出机挤出， 并通过辊涂方式涂覆于中间层上远离基材层的表面， 再进行冷却处理；
步骤 d: 将底涂层通过辊涂方式涂覆于热熔胶层上远离中间层的表面， 并进行烘干固化 处理；
步骤 e: 将粘结促进层通过辊涂方式覆盖于底涂层的表面， 进行烘干固化处理后收卷； 步骤 f: 将收卷后的卷材预涂膜分切成预定规格。
本发明的附加方面和优点将在下面的描述中部分给出， 部分将从下面的描述中变得 明显， 或通过本发明的实践了解到。 附图说明
本发明的上述和 /或附加的方面和优点从结合下面附图对实施例的描述中将变得明 显和容易理解， 其中：
图 1是根据本发明实施例的双向拉伸数码预涂膜的示意图；
图 2是根据本发明实施例的双向拉伸数码预涂膜的工艺系统的示意图。 附图标记：
01、 基材层； 02、 中间层； 03、 热熔胶层； 04、 底涂层； 05、 粘结促进层；
1、 放卷机； 2、 电晕处理器； 3、 第一涂布槽； 4、 第一涂布辊；
5、 烘干通道； 6、 冷却辊； 7、 臭氧发生器； 8、 挤出机；
9、 啮合辊； 10、 第二涂布槽； 11、 第二涂布辊；
12、 第三涂布槽； 13、 第三涂布辊； 14、 收卷机 具体实施方式
下面详细描述本发明的实施例， 所述实施例的示例在附图中示出， 其中自始至终相 同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附 图描述的实施例是示例性的， 仅用于解释本发明， 而不能理解为对本发明的限制。
在本发明的描述中， 需要理解的是， 术语 "上" 、 "下" 、 "竖直" 、 "水平" 、 "内"、 "外"等指示的方位或位置关系为基于附图所示的方位或位置关系， 仅是为了 便于描述本发明和简化描述， 而不是指示或暗示所指的装置或元件必须具有特定的方 位、 以特定的方位构造和操作， 因此不能理解为对本发明的限制。
需要说明的是， 术语 "第一" 、 "第二 "仅用于描述目的， 而不能理解为指示或暗 示相对重要性或者隐含指明所指示的技术特征的数量。 由此， 限定有 "第一"、 "第二" 的特征可以明示或者隐含地包括一个或者更多个该特征。进一步地，在本发明的描述中， 除非另有说明， "多个" 的含义是两个或两个以上。
如图 1、 图 2所示， 一种双向拉伸数码预涂膜， 包括基材层 01、 热熔胶层 03、 中间层 02、 底涂层 04和粘结促进层 05。 中间层 02与基材层 01复合， 热熔胶层 03设在中间层 02 上远离基材层 01的一面。 底涂层 04设在热熔胶层 03上的远离基材层 01的一面。 粘结促 进层 05设在底涂层 04的远离基材层 01的一面。
由于粘结促进层可以跟硅油、 蜡含量高的数码印刷品有很好的粘结力， 由此， 根据 本发明的预涂膜可以深入纸张纤维， 实现与纸张牢固结合。 另外， 在热熔胶层的表面涂 覆底涂层， 可以提高粘结促进层与热熔胶层之间的粘结性， 使粘结促进层与热熔胶层牢 固结合。
根据本发明的一个实施例， 基材层 01采用双向拉伸薄膜， 热熔胶层 03采用共聚聚 乙烯。
其中， 双向拉伸薄膜包括双向拉伸聚酯 (BOPET)薄膜或者双向拉伸尼龙 （BOPA) 薄膜或者双向拉伸聚丙烯 (BOPP)薄膜。双向拉伸聚酯 (BOPET)薄膜具有如下优点： ①良 好的机械性能， 且刚性好， 强度高； ②耐寒、 耐热性优良， 适应的温度范围为 -70〜150 °C ; ③良好的阻水、 阻气和保香性； ④耐油脂及大多数溶剂、 弱酸碱性液体。 双向拉伸 尼龙 （BOPA) 薄膜与其他传统薄膜相比， 具有透明性好、 光泽度高、 气味阻隔性强、 耐油耐热性强等优点， 同时由于 BOPA 薄膜无毒无害， 所以近年来成为了食品包装行 业的热门材料， 特别适合于冷冻、 蒸煮、 抽真空包装。 双向拉伸聚丙烯 (BOPP)薄膜一 般为多层共济薄膜， 是由聚丙烯颗粒经共挤形成片材后， 再经纵横两个方向的拉伸而制 得的， 由于拉伸分子定向， 所以这种薄膜的物理稳定性、 机械强度、 气密性较好， 透明 度和光泽度较高， 坚韧耐磨。
熔融后的热熔胶， 呈浅黄色或无色， 由基本树脂、 增粘剂、 粘度调节剂和抗氧剂等 成分组成。 所述热熔胶层采用乙烯-醋酸乙烯 （EVA)共聚物、 乙烯 -丙烯酸乙酯 （EEA) 共聚物、 乙烯-丙烯酸 （EAA) 共聚物、 乙烯 -丙烯酸甲酯 （EMA) 共聚物、 低密度聚乙 烯 （LDPE) 中的一种或者几种混合物。
优选的， 基材层 01的厚度为 10μηι〜50μηι， 热熔胶层 03的厚度为 10μηι〜50μηι。 更优选的， 基材层 01的厚度为 12μηι〜30μηι， 热熔胶层 03的厚度为 10μηι〜30μηι。
根据本发明的一个实施例， 中间层 02采用聚乙烯亚胺 （ΡΕΙ) ， 聚乙烯亚胺 （ΡΕΙ) 的分子式： （CH2CH2NH)n， 其中 n值根据聚合物的平均分子量在 1000〜10000的范围 内选择。 进一步地， 中间层 02采用固含量为 0.4 %〜1.5 %的聚乙烯亚胺 (PEI)水溶液， 中间层的厚度为 0.01μηι〜0.03μηι， 其涂覆干重为 0.009g/m2〜0.01 lg/m2。
底涂层 04采用含有消泡剂的水性表面处理剂， 粘结促进层 05采用含有消泡剂及流 平剂的有机或者无机胶黏剂。 进一步地， 底涂层 04采用胺类表面处理剂或者偶联剂， 其含有 1 %〜10 %的消泡剂，底涂层 04的厚度为 0.01μηι〜0.07μηι，其涂覆干重为 0.02g/ m2〜0.05g/m2。 粘结促进层 05采用共聚酯类胶黏剂， 并含有 2 %〜10 %的消泡剂， 以及 含有 0.1 %〜 1.5 %的流平剂， 粘结促进层 05 的厚度为 0.05μηι〜0.6μηι， 其涂覆干重为 0.2g/m2〜0.6g/m2。
根据本发明的一个实施例， 底涂层 04采用固含量 0.1 %〜5 %的胺类表面处理剂， 其含有 4 %〜8 %的消泡剂， 底涂层 04的厚度为 0.02μηι〜0.06μηι， 其涂覆干重为 0.02g/ m2〜0.04g/m2。粘结促进层 05采用固含量 1 %〜20 %的共聚酯类胶黏剂， 并含有 4 %〜7 %的消泡剂， 以及含有 0.5 %〜1 %的流平剂， 粘结促进层 05的厚度为 0.1μηι〜0.5μηι， 其涂覆干重为 0.2g/m2〜0.5g/m2。
优选的， 基材层 01、 热熔胶层 03、 中间层 02、 底涂层 04和粘结促进层 05的宽度 均相同。 下面结合附图并通过具体实施方式来进一步说明本发明的双向拉伸数码预涂膜。 实施例一：
如图 1、 图 2所示， 一种双向拉伸数码预涂膜， 包括基材层 01， 基材层的一面依 序设置有中间层 02、 热熔胶层 03、 底涂层 04、 粘结促进层 05。
其中， 基材层 01、 中间层 02、 热熔胶层 03、 底涂层 04、 粘结促进层 05的宽度均 为 1600mm。
基材层 01采用双向拉伸聚丙烯 (BOPP)薄膜，中间层 02采用固含量为 1 %的聚乙烯 亚胺 (PEI)水溶液， 热熔胶层 03采用乙烯-醋酸乙烯 (EVA)热熔胶， 底涂层 04采用固含 量 2.5 %的胺类表面处理剂， 其含有 6 %的消泡剂， 粘结促进层采用固含量 10 %的共聚 酯类胶黏剂， 并含有 5 %的消泡剂、 0.8 %的流平剂。
本实施例所述的双向拉伸数码预涂膜的制备方法包括如下步骤：
步骤 a: 基材层放卷
将厚度为 15μηι双向拉伸聚丙烯 (BOPP)薄膜安放于放卷机 1 上通过气胀轴放卷， 将其展开；
步骤 b: 涂布中间层
①在基材层的复合面涂布中间层之前， 应根据情况对复合面进行表面处理； 当基材 层采用双向拉伸聚丙烯 (BOPP)薄膜时， 需对复合面进行电晕处理； 由于双向拉伸聚丙 烯 (BOPP)薄膜属于非极性材料， 其表面不具有好的可粘性， 即其表面润湿张力小， 所 以双向拉伸聚内烯 (BOPP)薄膜必须经过电晕处理。 为了使其与中间中间层聚乙烯亚胺 (PEI)水溶液很好的粘接在一起， 需要对其表面进行电晕预处理以获得具有一定活性的 极性基团。 因此， 需要对双向拉伸聚丙烯 (BOPP)薄膜的准备涂覆聚乙烯亚胺 (PEI)水溶 液的表面 (与 PEI结合的一个表面)进行电晕处理， 以获得一定量诸如羰基一类的极性基 团， 以润湿张力 (达因值)来表示电晕处理的程度， 达到双向拉伸聚丙烯 (BOPP)薄膜表面 的达因值优选为 36; 当基材层是双向拉伸聚酯 (BOPET)薄膜或者双向拉伸尼龙 (BOPA) 薄膜， 由于双向拉伸聚酯 (BOPET)薄膜和双向拉伸尼龙 (BOPA)薄膜均是极性材料，可以 不进行电晕处理。
电晕处理是经高频高压电火花处理， 使双向拉伸薄膜表面的链状分子断裂， 链断裂 时产生的自由基与空气电晕产物发生氧化、交联反应， 在双向拉伸薄膜表面产生极性基 团， 部分极性基团注入薄膜内部使表面粗化， 从而增大了薄膜的表面张力。 电晕处理通 过电晕处理器 2进行， 具体操作过程本领域技术人员熟知， 不详细叙述。
②、 第一涂布辊 4将第一涂布槽 3 内的聚乙烯亚胺 (PEI)水溶液均勾涂布于双向拉 伸聚丙烯 (BOPP)薄膜的电晕处理表面上。
③利用烘干设备将涂布有中间层的基材层烘干， 烘干温度优选为 85 °C〜95 °C左右， 具体而言， 涂布有聚乙烯亚胺 (PEI)水溶液的双向拉伸聚丙烯 (BOPP)薄膜经过烘干通道 5进行烘干， 再通过冷却辊 6进行冷却， 烘干后中间层的厚度为 0.01μηι〜0.03μηι， 优 选为 0.015μηι， 其干重为 0.009g/m2〜0.011g/m2。
步骤 c: 复合热熔胶层
①挤出复合生产线的挤出机 8挤出乙烯-醋酸乙烯 (EVA)热熔胶，在生产线的复合工 位处设置有臭氧发生器 7， 由臭氧发生器 7产生臭氧喷吹到挤出的热熔胶的流延处， 同 时生产线的导辊将已经烘干的复合有聚乙烯亚胺的双向拉伸聚丙烯 (BOPP)薄膜输送至 复合工位， 并与流延至复合工位部位的热熔胶通过啮合辊 9挤压结合， 形成复合膜， 再 经过冷却辊 6冷却 (；温度为 18°C)处理， 热熔胶层的厚度为 25μηι;
臭氧发生器产生臭氧的浓度优选为 40 %， 功率为 800W， 气体流量为 3.5SCXFM, 臭氧可使热熔胶流延表面产生一些极性基团；
②厚度测量与调整： 利用 β射线在短距离内具有极强的穿透性和精确的测量性能 来测量厚度， 测量后将其结果反馈给计算机， 计算机控制挤出机的螺杆转速和模头部位 的模唇开度， 以便于获得厚度均勾一致的预涂膜。
步骤 d: 涂布底涂层
①、 涂布涂层之前， 先对热熔胶层表面通过电晕处理器 2 进行电晕表面处理， 达 到热熔胶层表面达因值在 36〜38范围内；
②、 第二涂布辊 11将第二涂布槽 10 内的胺类表面处理剂底涂层均勾涂覆于热熔 胶的表面， 再通过烘干通道 5进行烘干处理， 烘干后底涂层的厚度为 0.03μηι;
步骤 e: 涂布粘结促进层
第三涂布辊 13将第三涂布槽 12 内的共聚酯类胶黏剂粘结促进层均勾涂覆于底涂 层的表面， 再通过烘干通道 5进行烘干处理， 烘干后粘结促进层的厚度为 0.4μηι， 然后 通过收卷机 14收成卷材；
步骤 f: 分切
将收卷后的卷材预涂膜两侧边缘累计切掉 20mm， 最终产品宽度为 1580mm， 厚度 为 40.445μηι， 厚度偏差 2μηι。 实施例二：
如图 1所示， 一种双向拉伸数码预涂膜， 包括基材层 01， 基材层的一面依序设置 有中间层 02、 热熔胶层 03、 底涂层 04、 粘结促进层 05。
其中， 基材层 01、 中间层 02、 热熔胶层 03、 底涂层 04、 粘结促进层 05的宽度均 为 1600mm。
基材层 01采用双向拉伸尼龙 （BOPA) 薄膜， 中间层 02采用固含量为 1 %的聚乙 烯亚胺 (PEI)水溶液，热熔胶层 03采用将乙烯 -醋酸乙烯酯 (EVA)与乙烯-丙烯酸甲酯共聚 物 (EMA)的混合物， 按照混合重量比： 乙烯 -醋酸乙烯酯 (EVA)为 50 %， 乙烯-丙烯酸甲 酯共聚物 (EMA)为 50 %， 加入高速搅拌机内混合均勾， 搅拌混合时间约 3分钟。 乙烯- 醋酸乙烯酯 (EVA)中的 VA含量为 18 %， 熔融指数为 15g/10min， 乙烯-丙烯酸甲酯共聚 物 (EMA)的熔融指数为 17 g/10min; 底涂层 04采用固含量 2.5 %的胺类表面处理剂， 其 含有 6 %的消泡剂， 粘结促进层采用固含量 10 %的共聚酯类胶黏剂， 并含有 5 %的消泡 剂、 0.8 %的流平剂。
本实施例所述的双向拉伸数码预涂膜的制备方法包括如下步骤：
步骤 a: 基材层放卷
将厚度为 15μηι双向拉伸尼龙 （ΒΟΡΑ) 薄膜安放于放卷机上通过气胀轴放卷； 步骤 b: 涂布中间层
①、 第一涂布辊将第一涂布槽内的聚乙烯亚胺 (PEI)水溶液均勾涂覆于双向拉伸尼 龙 （BOPA) 薄膜的表面上；
②、 涂覆有聚乙烯亚胺 (PEI)水溶液的双向拉伸尼龙 （BOPA)薄膜经过烘干通道进 行烘干， 再通过冷却辊进行冷却， 烘干后中间层的厚度为 0.015μηι， 干重为 0.009g/m2〜 0.01g/m2之间；
步骤 c: 复合热熔胶层
①、 挤出复合生产线的挤出机挤出热熔胶， 在生产线的复合工位处设置有臭氧发 生器， 由臭氧发生器产生臭氧喷吹到挤出的热熔胶的流延处， 同时生产线的导辊将已经 烘干的复合有聚乙烯亚胺的双向拉伸尼龙 （BOPA) 薄膜输送至复合工位， 并与流延至 复合工位部位的热熔胶通过啮合辊挤压结合， 形成复合膜， 再经过冷却辊冷却 (温度为 18°C)处理， 热熔胶层的厚度为 25μηι;
②、 厚度测量与调整： 利用 β 射线在短距离内具有极强的穿透性和精确的测量性 能来测量厚度， 测量后将其结果反馈给计算机， 计算机控制挤出机的螺杆转速和模头部 位的模唇开度， 以便于获得厚度均勾一致的预涂膜。 （测量设备未在图中画出） 步骤 d: 涂布底涂层
①、 涂布涂层之前， 先对热熔胶层表面通过电晕处理器 2 进行电晕表面处理， 达 到热熔胶层表面达因值在 50〜54范围内；
②、 第二涂布辊 11将第二涂布槽 10 内的胺类表面处理剂底涂层均勾涂覆于热熔 胶的表面， 再通过烘干通道 5进行烘干处理， 烘干后底涂层的厚度为 0.03μηι;
步骤 e: 涂布粘结促进层
第三涂布辊 13将第三涂布槽 12 内的共聚酯类胶黏剂粘结促进层均勾涂覆于底涂 层的表面， 再通过烘干通道 5进行烘干处理， 烘干后粘结促进层的厚度为 0.4μηι， 然后 通过收卷机成卷材；
步骤 f: 分切
将收卷后的卷材预涂膜两侧边缘累计切掉 20mm， 最终产品宽度为 1580mm， 厚度 为 40.445μηι， 厚度偏差 2μηι。 相对于现有技术， 本发明具有以下有益效果：
1、 本发明通过在热熔胶层一侧复合粘结促进层， 与印刷品具有很好的粘结力， 并 可以深入纸张纤维，实现与纸张牢固结合；而在热熔胶层与粘结促进层之间设置底涂层， 提高了粘结促进层与热熔胶层之间的粘结性， 实现了粘结促进层与热熔胶层牢固结合； 2、 粘结促进层中与印刷品接触的最外侧粘结促进层可渗透印刷品内， 进而扩散到 纸张基材， 与纸张纤维形成网状交联结构， 尤其适合应用于硅油、 蜡含量重的数码打印 样张， 粘结促进层可渗透进数码印刷品的油墨层， 对数码印张具有超高粘接特性。 实验 数据如下表所示：
Figure imgf000009_0001
由上表的数据可知本发明的数码预涂膜对数码样张的平均粘结力要远远大于普通预涂 膜。
在本说明书的描述中， 参考术语"一个实施例"、 "一些实施例"、 "示意性实施例"、 "示 例"、 "具体示例"、 或 "一些示例"等的描述意指结合该实施例或示例描述的具体特征、 结 构、 材料或者特点包含于本发明的至少一个实施例或示例中。 在本说明书中， 对上述术语 的示意性表述不一定指的是相同的实施例或示例。 而且， 描述的具体特征、 结构、 材料或 者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本发明的实施例，本领域的普通技术人员可以理解：在不脱离本 发明的原理和宗旨的情况下可以对这些实施例进行多种变化、 修改、 替换和变型， 本发明 的范围由权利要求及其等同物限定。

Claims

权利要求书
1、 一种双向拉伸数码预涂膜， 其特征在于， 包括：
基材层：
热熔胶层；
中间层， 所述中间层设在所述基材层与所述热熔胶层之间；
底涂层， 所述底涂层设在所述热熔胶层上的远离基材层的一面；
粘结促进层， 所述粘结促进层设在所述底涂层的远离基材层的一面。
2、 根据权利要求 1所述的双向拉伸数码预涂膜， 其特征在于， 所述基材层采用双 向拉伸薄膜， 所述热熔胶层采用共聚聚乙烯。
3、 根据权利要求 2所述的双向拉伸数码预涂膜， 其特征在于， 所述基材层为双向 拉伸聚酯 (BOPET)薄膜、 双向拉伸聚丙烯 (BOPP)薄膜或双向拉伸尼龙 （BOPA) 薄膜， 所述基材层的厚度为 10 μ ηι〜50 μ ηι;
所述热熔胶层采用以下材料的一种或几种： 乙烯-醋酸乙烯 （EVA) 共聚物、 乙烯- 丙烯酸乙酯 （EEA) 共聚物、 乙烯-丙烯酸 （EAA) 共聚物、 乙烯 -丙烯酸甲酯 （EMA) 共聚物、 以及低密度聚乙烯 （LDPE)， 所述热熔胶层的厚度为 10 μ ηι〜50 μ ηι。
4、 根据权利要求 1所述的双向拉伸数码预涂膜， 其特征在于， 所述中间层采用聚 乙烯亚胺 （ΡΕΙ)， 聚乙烯亚胺 （ΡΕΙ) 的分子式： （CH2CH2NH)n， 其中 n值根据聚合物 的平均分子量在 1000〜10000的范围内选择。
5、 根据权利要求 4所述的双向拉伸数码预涂膜， 其特征在于， 所述中间层采用固 含量为 0.4 %〜1.5 %的聚乙烯亚胺 (PEI)水溶液， 中间层的厚度为 0.01 μ m〜0.03 m， 其涂覆干重为 0.009g/m2〜0.011g/m2。
6、 根据权利要求 1所述的双向拉伸数码预涂膜， 其特征在于， 所述底涂层采用含 有消泡剂的水性表面处理剂，所述粘结促进层采用含有消泡剂及流平剂的有机或者无机 胶黏剂。
7、 根据权利要求 6所述的双向拉伸数码预涂膜， 其特征在于， 所述底涂层采用胺 类表面处理剂或者偶联剂，其含有 1 %〜10 %的消泡剂，所述底涂层的厚度为 0.01 μ ηι〜 0.07 μ m， 其涂覆干重为 0.02g/m2〜0.05g/m2 ;
所述粘结促进层采用共聚酯类胶黏剂， 并含有 2 %〜10 %的消泡剂， 以及含有 0.1 %〜1.5 %的流平剂， 所述粘结促进层的厚度为 0.05 μ ηι〜0.6 μ m， 其涂覆干重为 0.2g/ m2 ~0.6g/m
8、 根据权利要求 7所述的双向拉伸数码预涂膜， 其特征在于， 所述底涂层采用固 含量 0.1%〜5%的胺类表面处理剂， 其含有 4%〜8%的消泡剂， 所述底涂层的厚度为 0.02μ m〜0.06 m， 其涂覆干重为 0.02g/m2〜0.04g/m2;
所述粘结促进层采用固含量 1%〜20%的共聚酯类胶黏剂，并含有 4%〜7%的消泡 剂， 以及含有 0.5%〜1%的流平剂， 所述粘结促进层的厚度为 0.1 μ ηι〜0.5μ ηι， 其涂 覆干重为 0.2g/m2〜0.5g/m2。
9、 根据权利要求 1〜8任一项所述的双向拉伸数码预涂膜， 其特征在于， 所述基材 层、 所述中间层、 所述热熔胶层、 所述底涂层、 所述粘结促进层的宽度均相同。
10、 一种双向拉伸数码预涂膜的制备方法， 其特征在于， 包括如下步骤： 步骤 a: 将基材层安放于放卷机上进行放卷；
步骤 b: 在基材层的复合面采用辊涂方式均勾涂覆中间层， 并进行烘干固化处理； 步骤 c: 热熔胶通过挤出机挤出， 并通过辊涂方式涂覆于中间层上远离基材层的表 面， 再进行冷却处理；
步骤 d: 将底涂层通过辊涂方式涂覆于热熔胶层上远离中间层的表面， 并进行烘干 固化处理；
步骤 e: 将粘结促进层通过辊涂方式覆盖于底涂层的表面， 进行烘干固化处理后收 卷；
步骤 f: 将收卷后的卷材预涂膜分切成预定规格。
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