WO2014005537A1

WO2014005537A1 - Biaxially-oriented tackifying precoated film and manufacturing method therefor

Info

Publication number: WO2014005537A1
Application number: PCT/CN2013/078844
Authority: WO
Inventors: 钟玉
Original assignee: 北京康得新复合材料股份有限公司
Priority date: 2012-07-04
Filing date: 2013-07-04
Publication date: 2014-01-09
Also published as: CN102757738B; CN102757738A

Abstract

A biaxially-oriented tackifying precoated film and a manufacturing method therefor. The biaxially-oriented tackifying precoated film comprises: a substrate (01), an intermediate layer (02), where the intermediate layer is provided on the substrate (01), a hot-melt adhesive layer (03), where the hot-melt adhesive layer is provided on the intermediate layer (02), and a tackifying layer (04), where the tackifying layer (04) is provided on the hot-melt adhesive layer (03).

Description

Biaxial stretching thickening precoating film and production method thereof

Technical field

The present invention relates to the field of printing technology, and in particular to a precoat film, and more particularly to a biaxially stretched tackifying precoat film. Background technique

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 coating process has environmental protection, high safety, convenient operation, high efficiency, energy saving and performance compared with the instant coating film coating process. Excellent and so on.

Paper publications, packaging materials and other printed materials have good visual effects and bright colors after pre-coated film coating. At present, domestic pre-coated film products are common EVA type or EVA type mixed EAA type pre-coated film, for low-speed manual The coating process and the products that do not need to be rolled and embossed, the ordinary pre-coated film can meet the requirements. However, for the fully automatic high-speed laminating process, and for the products after the rolling and the uneven processing, the ordinary pre-coated film can not meet the requirements, and the quality problems such as foaming, delamination and poor bonding are exhibited.

Therefore, new materials and production methods must be designed to produce pre-coated films that can be adapted to high-speed lamination and post-rolling treatment without stripping. Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Thus, the present invention provides a biaxially stretched tackifying precoat film which has the advantages of simple structure, convenient fabrication, and high bonding performance.

A biaxially stretched tackifying precoat film according to an embodiment of the present invention, comprising: a substrate; an intermediate layer, the intermediate layer is disposed on the substrate; a hot melt adhesive layer, the hot melt adhesive layer is disposed on And the adhesion-promoting layer is disposed on the hot-melt adhesive layer.

According to the precoat film of the embodiment of the present invention, by applying an adhesion promoting layer on one side of the hot melt adhesive layer, the adhesion between the precoat film and the printed matter can be improved, whereby the adhesion of the precoat film is far greater. For ordinary pre-coated films, it is suitable for printing products that have post-treatment requirements, low surface wetting tension, and are difficult to coat at high speeds.

According to an embodiment of the present invention, the substrate is a biaxially stretched film, the intermediate layer is made of polyethyleneimine, the hot melt adhesive layer is made of copolymerized polyethylene, and the thickened layer is made of water containing auxiliary components. Polyurethane emulsion.

According to an embodiment of the present invention, the substrate is a biaxially oriented polyester film or a biaxially stretched nylon film or a bidirectional A polypropylene film is stretched.

According to an embodiment of the present invention, the hot melt adhesive layer is an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer or a low density polyethylene.

According to an embodiment of the present invention, the adhesion-promoting layer is a mixture of the polyurethane emulsion having a solid content of 5% to 50% and the auxiliary component having a solid content of 0.1% to 10%, wherein the auxiliary component comprises a stream. Flat agent, adhesion promoter.

According to an embodiment of the present invention, the polyurethane emulsion has a solid content of 10% to 30%, and the auxiliary component has a solid content of 1% to 5%.

According to an embodiment of the present invention, the substrate has a thickness of 10 to 30 μm, the intermediate layer has a thickness of 0.01 to 0.03 μm, and the hot melt adhesive layer has a thickness of 10 to 35 m. The thickness of the adhesion-promoting layer is 0.1 to 0.5 m, and the dry weight of the adhesion-promoting layer is 0.05 to 0.5 g/m ² .

According to an embodiment of the present invention, the substrate has a thickness of 12 to 20 μm, the intermediate layer has a thickness of 0.01 to 0.02 rn, and the hot melt adhesive layer has a thickness of 12 to 25 m. The thickness of the adhesive layer is 0.2 to 0.4 m, and the dry weight of the adhesion-promoting layer is 0.1 to 0.3 g/m ² .

According to an embodiment of the present invention, the intermediate layer is a coated polyethyleneimine aqueous solution having a solid content of 0.4% to 1.5%, and the polyethyleneimine has the formula: (CH2CH2NH) n, wherein the n value is according to polymerization. The average molecular weight of the substance is selected in the range of 1000 to 10,000.

The pre-coated film according to the embodiment of the present invention has a large adhesive force, so that the embossing and the tying of the pre-coated film can be perfectly realized to meet the laminating requirements of the customers. The polyurethane emulsion is used as an adhesion-promoting layer, which can penetrate into the ink layer of the printed matter, and can have good adhesion with various inks, and has ultra-high adhesion characteristics to the printed matter. Compared with the prior art, the pre-coated film has The utility model has the advantages of simple structure, convenient manufacture and high bonding performance.

The invention also proposes a method for producing a biaxially stretched tackifying precoat film, comprising the following steps:

a. placing the substrate coil on the unwinder and unwinding through the inflation shaft;

b, the side of the substrate to be coated with the intermediate layer is corona treated, so that the surface of the substrate has a cause value of 36-54;

c. Applying the intermediate layer to the corona-treated surface of the substrate by coating roll coating, and then drying it through the drying channel;

d. Extrusion of the hot melt adhesive layer by the extruder, while the ozone generated by the ozone generator is sprayed to the casting of the extruded hot melt adhesive layer material, and the hot melt adhesive layer at the casting passes through the meshing roller Extrusion is bonded to the surface of the intermediate layer to form a composite film, which is then cooled by a cooling roll;

e, applying an adhesion promoting layer to the surface of the hot melt adhesive layer by coating roll coating;

f. Dry the coated pre-coated film by using a drying channel, and then use the winder to wind the processed pre-coated film.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows. Obviously, or as understood by the practice of the invention. DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic view of a biaxially stretched tackifying precoat film according to an embodiment of the present invention;

2 is a schematic view showing the structure of a production system of a biaxially stretched tackifying precoat film according to an embodiment of the present invention. Reference mark:

01, substrate; 02, intermediate layer; 03, hot melt adhesive layer; 04, adhesion promoting layer;

I, unwinding machine; 2, corona processor; 3, the first coating roller; 4, the first coating tank;

5. Drying channel; 6. Engagement roller; 7. Extruder; 8. Cooling roller;

9. a second coating roller; 10, a second coating tank;

I I, winder; 12, ozone tube

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative only and not to limit the invention.

In the description of the present invention, it is to be understood that the orientation or positional relationship of the terms "upper", "lower", "top", "bottom" and the like is based on the orientation or positional relationship shown in the drawings, only for the purpose of The invention is not limited by the scope of the invention, and is not intended to be a limitation of the invention.

It should be noted that the terms "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.

As shown in FIG. 1, a biaxially stretched tackifying precoat film according to an embodiment of the present invention comprises a substrate 01, an intermediate layer 02 disposed on the substrate 01, and a hot melt adhesive layer disposed on the intermediate layer 02. 03, and an adhesion promoting layer 04 provided on the hot melt adhesive layer 03. Alternatively, the substrate 01 may be a biaxially oriented polyester film or a biaxially oriented nylon film or a biaxially oriented polypropylene film.

Thus, by applying the adhesion promoting layer 04 on the side of the hot melt adhesive layer 03, the adhesion between the precoat film and the printed matter can be improved. The adhesion of the pre-coated film is much larger than that of the conventional pre-coated film, and is suitable for printing products which have the requirements of a post-treatment process, have a low surface wetting tension, and are difficult to coat at a high speed.

According to a preferred embodiment of the present invention, the substrate 01 is a biaxially oriented film, the intermediate layer 02 is made of polyethyleneimine (PEI), the hot melt adhesive layer 03 is made of copolymerized polyethylene, and the adhesion layer 04 is selected to contain auxiliary components. Waterborne polyurethane emulsion.

Therefore, such a pre-coating film is a novel pre-coating film, and because of its large adhesive force, the embossing, tying and the like embossing process after the pre-coating film coating is perfectly realized, satisfying the majority The customer's film coating needs, at the same time, polyurethane emulsion as the adhesion layer 04, which can penetrate into the ink layer of the printed matter, and can have good adhesion with a variety of inks, and has ultra-high adhesion characteristics to the printed matter.

In an alternative embodiment of the present invention, the hot melt adhesive layer 03 is an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methyl acrylate copolymer or a low density polyethylene. .

According to some embodiments of the present invention, the adhesion promoting layer 04 is a mixture of the polyurethane emulsion having a solid content of 5% to 50% and the auxiliary component having a solid content of 0.1% to 10%, the auxiliary component including leveling. Agent, adhesion promoter. Optionally, the polyurethane emulsion has a solid content of 10% to 30%, and the auxiliary component is contained in an amount of 1% to 5%.

According to some preferred embodiments of the present invention, the substrate 01 has a thickness of 12 to 20 m, and the thickness of the intermediate layer 02 is

0.01-0.02 u rn, the thickness of the hot-melt adhesive layer 03 is 12 to 25 μ m, the thickness of the adhesion-promoting layer 04 is 0.2 to 0.4 μm, and the dry weight of the adhesion-promoting layer 04 is 0.1 to 0.3 g/m. ² . Optionally, the intermediate layer 02 is a coated polyethyleneimine aqueous solution having a solid content of 0.4% to 1.5%, and the molecular formula of the polyethyleneimine: (CH2CH2NH) n, according to the average molecular weight of the polymer is 1000~10000 The range of values is chosen to be n. Embodiment 1,

The precoat film according to the embodiment of the present invention will be described in detail below by taking a biaxially oriented polyester film (BOPET) tackified precoat film having a width of 1600 mm as an example.

As shown in Fig. 1, the biaxially stretched polyester film (BOPET) tackified precoat film is composed of a substrate 01, an intermediate layer 02, a hot melt adhesive layer 03, and an adhesion promoting layer 04, a substrate 01, an intermediate layer 02, and a heat. The melt layer 03 and the adhesion promoting layer 04 have the same width.

The substrate 01 is made of biaxially oriented polyester film (BOPET) with a width of 1620 mm and a thickness of 12 m; the intermediate layer 02 is made of polyethyleneimine (PEI), and its coated solid content is 1.2%, and the width of the coating is It is 1620 mm, the thickness is 0.015 μm, and the coating amount is between 0.009 and 0.01 g/m ² ;

Hot melt adhesive layer 03 is made of ethylene-vinyl acetate (EVA) copolymer with a composite width of 1620mm and a thickness of

13 μ m.

The adhesion-promoting layer 04 uses a polyurethane emulsion having a solid content of 5% to 50% and an auxiliary component having a solid content of 0.1% to 10%. The mixture, the auxiliary component includes a leveling agent, an adhesion promoter, etc., the thickness of the adhesion-promoting layer is 0.3 m, and the coating dry weight of the adhesion-promoting layer 04 is between 0.05 and 0.5 g/m ² .

The thickness of the finished precoated film was about 25.4 μm. A method for producing a biaxially stretched polyester film (BOPET) tackified precoat film according to an embodiment of the present invention, as shown in FIG. 2, includes the following steps:

Step a, unwinding the substrate layer:

A biaxially stretched polyester film (ΒΟΡΕΤ) having a thickness of 12 m is placed on the unwinder 1 and unwound through an inflation shaft to unfold it;

Step b, corona treatment of the substrate:

The unrolled biaxially oriented polyester film (BOPET) substrate is fed into the corona processor 2, and one side of the intermediate layer to be coated is subjected to corona treatment so that the surface cause value thereof is 54;

Step C, coating the middle layer:

The corona-treated biaxially stretched polyester film (BOPET) substrate from the corona processor 2 enters the first coating roll 3, and the first coating roll 3 is placed in the first coating tank 4. A polyethyleneimine (PEI) aqueous solution is coated on the corona-treated surface of the substrate to bond the polyethyleneimine (PEI) intermediate layer to the biaxially oriented polyester film (BOPET) substrate, and then the bonded film enters Drying channel 5 is subjected to drying treatment, and the thickness of the intermediate layer after drying is 0.015 μm, and the coating amount is between 0.009 and 0.01 g/m ² ;

Step d, composite hot melt adhesive layer:

Extruder 7 of the extrusion compound line Extrusion of ethylene-vinyl acetate (EVA) copolymer hot melt adhesive, an ozone generator (not shown) is installed at the compound station of the production line, and ozone is generated by the ozone generator. And spraying through the ozone tube 12 to the casting of the extruded hot melt adhesive, and the bonding roller 6 of the production line transports the dried biaxially stretched polyester film (BOPET) film combined with polyethyleneimine to the composite. The working place, and the hot melt adhesive cast to the composite station part is pressed and combined by the engaging roller 6 to form a composite film, which is then cooled by a cooling roll 8 (temperature is 20 ° C), and the thickness of the hot melt adhesive layer is 13 Ηι;

Step e, coating the adhesion layer:

The film conveyed from the cooling roll 8 enters the second coating roll 9, and the second coating roll 9 will have a solid content of 5% to 50% of the polyurethane emulsion placed in the second coating tank 10 and the content is 0.1%~ 10% of the auxiliary component mixture is coated on the surface of the hot melt adhesive layer of the film to be combined with the film, and then the combined film enters the drying channel 5 for drying, and the thickness of the tackified layer after drying is 0.3 m. The adhesion-promoting layer has a coating dry weight of between 0.05 and 0.5 g/m ² , and the auxiliary component in the adhesion-promoting layer comprises a leveling agent, an adhesion promoter, and the like;

Step f, finished product winding: The processed pre-coated film is wound by the winder 11, and the edges of the rolled pre-coated film are collectively cut 20 mm, and the final product width is 1600 mm, the thickness is 25.4 m, and the thickness deviation is 2 m. Embodiment 2:

The precoat film according to the embodiment of the present invention will be described in detail below by taking a biaxially oriented polypropylene film (BOPP) thickened precoat film having a width of 1600 mm as an example:

As shown in FIG. 1, the biaxially oriented polypropylene film (BOPP) tackifying precoat film is composed of a substrate 01, an intermediate layer 02, a hot melt adhesive layer 03, and an adhesion promoting layer 04, a substrate 01, an intermediate layer 02, and a heat. The melt layer 03 and the adhesion promoting layer 04 have the same width.

The substrate 01 is a biaxially oriented polypropylene film (BOPP) having a width of 1620 mm and a thickness of 20 m; the intermediate layer 02 is made of polyethyleneimine (PEI), and the coating has a solid content of 0.8% and a coating width. It is 1620 mm, the thickness is 0.01 μ m, and the coating amount is between 0.009 and 0.01 g/m ² ;

The hot melt adhesive layer 03 is an ethylene-methyl acrylate (EMA) copolymer having a composite width of 1620 mm and a thickness of 20 μm.

The adhesion-promoting layer 04 is a mixture of a polyurethane emulsion having a solid content of 5% to 50% and an auxiliary component having a content of 0.1% to 10%, and the auxiliary component includes a leveling agent, an adhesion promoter, etc., and the thickness of the adhesion-promoting layer is 0.5 m, the coating dry weight of the adhesion promoting layer 04 is between 0.05 and 0.5 g/m ² .

The finished precoated film has a thickness of about 40.5 μm.

The production method of the biaxially oriented polypropylene film (BOPP) thickened precoat film, as shown in Fig. 2, includes the following steps:

Step a, unwinding the substrate layer:

A biaxially oriented polypropylene film (BOPP) having a thickness of 20 μm is placed on the unwinder 1 and unwound through an inflation shaft to unfold it;

Step b, corona treatment of the substrate:

The unrolled biaxially oriented polypropylene film (BOPP) substrate is fed into the corona processor 2, and one side of the intermediate layer to be coated is subjected to corona treatment so that its surface dyne value is 36;

Step c, coating the middle layer:

The corona-treated biaxially oriented polypropylene film (BOPP) substrate from the corona processor 2 enters the first coating roll 3, and the first coating roll 3 is placed in the first coating tank 4. An aqueous solution of polyethyleneimine (PEI) is coated on the corona-treated surface of the substrate to bond the polyethyleneimine (PEI) intermediate layer to the biaxially oriented polypropylene film (BOPP) substrate, and then the composite film enters Drying channel 5 is subjected to drying treatment, and the thickness of the intermediate layer after drying is 0.01 μ m, and the coating amount is between 0.009 and 0.01 g/m ² ; Step d, composite hot melt adhesive layer:

The extruder 7 of the extrusion compounding line extrudes the ethylene-methyl acrylate (EMA) copolymer hot melt adhesive, and an ozone generator is arranged at the compound station of the production line, and ozone is generated by the ozone generator and sprayed through the ozone tube 12 Blowing to the casting of the extruded hot melt adhesive, while the intermeshing roller 6 of the production line transports the already dried polyethyleneimine-coated biaxially oriented polypropylene film (BOPP) film to the composite station, and the flow The hot melt adhesive which is extended to the composite station is pressed and joined by the engaging roller 6 to form a composite film, which is then cooled by a cooling roller 8 (temperature is 20 ° C), and the thickness of the hot melt adhesive layer is 20 μm;

Step e, coating the adhesion layer:

The film conveyed from the cooling roll 8 enters the second coating roll 9, and the second coating roll 9 will have a solid content of 5% to 50% of the polyurethane emulsion placed in the second coating tank 10 and the content is 0.1%~ 10% of the auxiliary component mixture is coated on the surface of the hot melt adhesive layer of the film to be combined with the film, and then the composite film is dried into the drying channel 5, and the thickness of the thickened layer after drying is 0.5 m. The adhesion-promoting layer has a coating dry weight of 0.05 to 0.5 g/n, and the auxiliary component in the adhesion-promoting layer includes a leveling agent, an adhesion promoter, and the like;

Step f, finished product winding:

The processed pre-coated film is wound by the winder 11 and the edges of the rolled pre-coated film are cut and cut 20 mm, and the final product width is 1600 mm, the thickness is 40.5 m, and the thickness deviation is 2 m.

According to the precoat film of the embodiment of the present invention, by applying an adhesion promoting layer on one side of the hot melt adhesive layer, the adhesion between the precoat film and the printed matter can be improved, whereby the adhesion of the precoat film is far greater. For ordinary pre-coated films, it is suitable for printing products that have post-treatment requirements, low surface wetting tension, and are difficult to coat at high speeds. In addition, since the precoat film according to the present invention has a large adhesive force, the embossing process such as embossing and twisting after the precoating film is completely realized, and the coating demand of the customers is satisfied, and at the same time, the polyurethane is used. As an adhesion-promoting layer, the emulsion can penetrate into the ink layer of the printed matter, and can have good adhesion with a variety of inks, and has ultra-high adhesion characteristics to the printed matter. Compared with the prior art, the pre-coated film has a simple structure. , easy to manufacture, high bonding performance.

In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. Particular features, structures, materials or features described in the examples or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims

claims

1. A biaxially stretched viscosity-increasing pre-coated film, including:

base material;

An intermediate layer, the intermediate layer is provided on the base material;

Hot melt adhesive layer, the hot melt adhesive layer is provided on the middle layer; and

An adhesion-promoting layer is provided on the hot-melt adhesive layer.

2. The biaxially stretched tackifying pre-coated film according to claim 1, characterized in that the substrate is a biaxially oriented film, the intermediate layer is made of polyethyleneimine, and the hot melt adhesive layer is made of copolymer Polyethylene, the viscosity-increasing layer uses a water-based polyurethane emulsion containing auxiliary components.

3. The biaxially oriented tackifying pre-coated film according to claim 2, characterized in that the substrate is a biaxially oriented polyester film, a biaxially oriented nylon film or a biaxially oriented polypropylene film.

4. The biaxially stretched tackifying pre-coated film according to claim 2, characterized in that the hot melt adhesive layer is ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, Ethylene-methyl acrylate copolymer or low density polyethylene.

5. The biaxially stretched tackifying pre-coated film according to claim 2, wherein the tackifying layer is the polyurethane emulsion with a solid content of 5% to 50% and a solid content of 0.1% to 10%. A mixture of the auxiliary components, the auxiliary components include leveling agents and adhesion promoters.

6. The biaxially stretched viscosity-increasing pre-coated film according to claim 5, characterized in that the solid content of the polyurethane emulsion is 10%~30%, and the solid content of the auxiliary component is 1%~5%.

7. The biaxially stretched tackifying pre-coated film according to any one of claims 1 to 5, characterized in that the thickness of the base material is 10~30 m, and the thickness of the intermediate layer is 0.01~0.03 m, The thickness of the hot melt adhesive layer is 10~35 μm, the thickness of the tackifier layer is 0.1~0.5 μm, and the coating dry weight of the tackifier layer is 0.05~0.5g/m ² .

8. The biaxially stretched adhesion-increasing pre-coated film according to claim 7, characterized in that the thickness of the base material is 12~20 μm, the thickness of the intermediate layer is 0.01~0.02 m, and the heat The thickness of the melt adhesive layer is 12~25 μm, the thickness of the tackifier layer is 0.2~0.4 m, and the coating dry weight of the tackifier layer is 0.1~0.3g/m ² .

9. The biaxially stretched viscosity-increasing pre-coated film according to claim 8, wherein the intermediate layer is a polyethylene imine aqueous solution with a solid content of 0.4% to 1.5%, and the polyethylene imine is The molecular formula of the amine: (CH2CH2NH) n, the n value is selected according to the average molecular weight of the polymer in the range of 1000~10000.

10. A method for producing a biaxially stretched viscosity-increasing pre-coated film, which is characterized in that it includes the following steps:

a. Place the base material roll on the unwinding machine and unwind through the air shaft;

b. Perform corona treatment on the side of the substrate to be coated with the intermediate layer so that the surface dyne value of the substrate is 36-54; c. Coat the intermediate layer on the corona-treated surface of the substrate through coating roller coating, and then dry it through the drying channel;

d. Use the extruder to extrude the hot melt adhesive layer, and at the same time blow the generated ozone through the ozone generator to the casting place of the extruded hot melt adhesive layer material, and the hot melt adhesive layer at the casting place passes through the meshing roller It is extruded and bonded to the surface of the middle layer to form a composite film, which is then cooled by cooling rollers;

e. Coat the adhesion-promoting layer on the surface of the hot melt adhesive layer through coating roller coating;

f. Use the drying channel to dry the coated pre-coated film, and then use the winding machine to wind up the processed pre-coated film.