WO2014005538A1

WO2014005538A1 - Universal precoating film

Info

Publication number: WO2014005538A1
Application number: PCT/CN2013/078845
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: CN102757739B; CN102757739A

Abstract

Disclosed is a universal precoating film, comprising: a substrate (1), the substrate (1) being a biaxial stretched plastic film with a thickness of 10-30 μm; an intermediate layer (2), the intermediate layer (2) being bonded with the substrate (1), the intermediate layer (2) being polyethylenimine, with a thickness of 0.01-0.03 μm; a hot melt adhesive layer (3), the hot melt adhesive layer (3) being bonded with the intermediate layer (2), the hot melt adhesive layer (3) having a thickness of 10-35 μm; and an adhesion-promotion layer (4), the adhesion-promotion layer being bonded with the hot melt adhesive layer (3), the adhesion-promotion layer (4) being a heat-sensitive or pressure-sensitive aqueous adhesive, with a thickness of 0.01-0.08 μm.

Description

Universal precoat

Technical field

The present invention relates to the field of printing film technology, and in particular to a general-purpose pre-coating film having high versatility. 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.

With the maturity and popularity of digital printing technology, in order to ensure the excellent color and image characteristics of printed matter, various fillers and additives such as wax and silicone oil are often introduced into the printing ink when the film is coated after printing, which seriously reduces the number of fillers and additives. The adhesion of the film adhesive layer to the printed matter poses a serious challenge to the traditional film coating technology.

In addition, as the most important part of printing technology, the manufacturing level and product range of printing inks are constantly being renewed. The main components of inks from different manufacturers vary greatly. The main components of inks are exemplified by acrylic acid systems, alkyd resin systems, polyurethane systems, vinyl acetate-ethylene copolymer systems, and epoxy systems. The rich variety of ink types also poses new challenges for the adhesive technology of post-printing films.

Therefore, it is necessary to develop a precoat film having excellent adhesive strength for prints of various inks, which is also a starting point and innovation of the present invention. 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 general-purpose general-purpose precoat film having high versatility.

A general-purpose precoat film according to an embodiment of the present invention includes: a substrate which is a biaxially stretched plastic film having a thickness of 10 to 30 m _; an intermediate layer, the intermediate layer being bonded to the substrate, The intermediate layer is a polyethyleneimine having a thickness of 0.01 to 0.03 m _{; a} hot melt adhesive layer, the hot melt adhesive layer is combined with the intermediate layer, and the hot melt adhesive layer has a thickness of 10 to 35 m _; And an adhesion-promoting layer, which is combined with the hot-melt adhesive layer, wherein the adhesion-promoting layer is a heat-sensitive or pressure-sensitive aqueous adhesive having a thickness of 0.01 to 0.08 μm.

The general-purpose pre-coating film according to the embodiment of the invention has good adhesion to various inks, and has excellent bonding strength to various printing technologies, especially those produced by digital printing technology, and can be coated after filming. The embossing, rolling line and other protrusion processes are perfectly realized. It has the advantages of high versatility, high color saturation, high brightness, high tensile strength, high width and high flatness, and meets the increasingly diverse print film. demand.

According to an embodiment of the invention, the substrate is a biaxially oriented polypropylene film, a biaxially oriented polyester film or a biaxially stretched nylon film. According to an embodiment of the invention, the hot melt adhesive layer comprises an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer or an ethylene-methyl acrylate copolymer.

According to an embodiment of the present invention, the aqueous adhesive comprises an acrylic emulsion or a polyurethane emulsion, and an adhesion promoter.

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 m, the hot melt adhesive layer has a thickness of 15 to 26 m, and the thickness of the adhesion promoting layer is 0.05. -0.07 μ m.

The general-purpose pre-coating film according to the present invention is manufactured by coating and extrusion compounding technology, and has good adhesion with various inks, and is excellent for various printing technologies, especially those produced by digital printing technology. The bonding strength enables the embossing and rolling lines after the film to be perfectly realized. It has high versatility, high color saturation, high brightness, high tensile strength, high stiffness, high flatness, etc. The advantages are to meet the increasingly diverse needs of printed film coating.

The additional aspects and advantages of the invention will be set forth in part in the description which follows. DRAWINGS

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

1 is a schematic cross-sectional view of a general-purpose precoat film according to an embodiment of the present invention. Reference mark:

1. Substrate; 2. Intermediate layer; 3. Hot melt adhesive layer; 4. Adhesive layer.

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 terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or component referred to has a particular orientation, is constructed and operated in a particular orientation and is therefore not to be construed as limiting 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.

A general-purpose precoat film according to an embodiment of the present invention will be described below with reference to FIG.

A general-purpose precoat film according to an embodiment of the present invention includes: a substrate 1, an intermediate layer 2, a hot melt adhesive layer 3, and Adhesive layer 4.

As shown in Fig. 1, the substrate 1 is a biaxially stretched plastic film having a thickness of 10 to 30 m. The intermediate layer 2 is bonded to the substrate 1, and the intermediate layer 2 is polyethyleneimine having a thickness of 0.01 to 0.03 m. The hot melt adhesive layer 3 is bonded to the intermediate layer 2, and the thickness of the hot melt adhesive layer 3 is 10 to 35 μm. The adhesion-promoting layer 4 is combined with the hot-melt adhesive layer 3, which is a heat-sensitive or pressure-sensitive aqueous adhesive having a thickness of 0.01 to 0.08 μm.

Thus, the universal pre-coated film according to the embodiment of the present invention has good adhesion to various inks, and has excellent bonding strength to various printing technologies, particularly those produced by digital printing technology, and can be coated. The embossing and rolling lines after the film are perfectly realized, and have the advantages of high versatility, high color saturation, high brightness, high tensile strength, high width and high flatness, etc., satisfying increasingly diverse Print film requirements.

According to an embodiment of the present invention, the substrate 1 is a biaxially oriented polypropylene film, a biaxially oriented polyester film or a biaxially stretched nylon film.

According to an embodiment of the present invention, the hot melt adhesive layer 3 comprises an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-acrylic acid copolymer or an ethylene-methyl acrylate copolymer.

According to an embodiment of the present invention, the substrate 1 has a thickness of 12 to 20 m, the intermediate layer 2 has a thickness of 0.01 to 0.02 u rn, and the hot melt adhesive layer 3 has a thickness of 15 to 26 m, and the thickness of the adhesion-promoting layer 4 is It is 0.05-0.07 μ m. The precoat film according to the present invention will be described in detail below with reference to the accompanying drawings in conjunction with the embodiments.

Example 1

A biaxially oriented polypropylene (BOPP) universal precoat film having a finished product width of 1410 mm is taken as an example for detailed description.

1) The configuration of the water-sensitive adhesive for the adhesion-promoting layer. An aqueous adhesive having good adhesion to the ink is prepared in an appropriate ratio by using an acrylic emulsion or a polyurethane emulsion and an adhesion promoter. The "appropriate ratio" is a common knowledge in the art and will not be described in detail herein.

2) Referring to Figure 1, the finished biaxially oriented polypropylene (BOPP) universal precoat film has four layers, the first layer is the substrate 1, the second layer is the intermediate layer 2, and the third layer is the hot melt adhesive layer 3. The fourth layer is the adhesion promoting layer 4. The substrate 1 was a biaxially oriented polypropylene (BOPP) film having a width of 1430 mm; the intermediate layer 2 was made of polyethyleneimine (PEI); and the hot melt adhesive layer 3 was made of ethylene-vinyl acetate (EVA) hot melt adhesive.

The intermediate layer 2 is uniformly coated on the surface of the substrate 1 by a production line composed of an extruder and a composite device, and then the hot melt adhesive layer 3 is uniformly composited on the surface of the intermediate layer 2, and then cut after compounding. In the edge system, the accumulated edges on both sides will be cut off by 20 mm, and the final product will be about 20 mm narrower than the substrate. In the width direction, the thickness deviation will be 2 μm. The thickness of the substrate 1 was selected to be 15 μm, the thickness of the intermediate layer 2 was approximately 0.015 μm (coating amount was 0.009 to 0.01 g/m ² ), and the thickness of the hot melt adhesive layer 3 was selected to be 15 μm. After the biaxially oriented polypropylene (BOPP) pre-coated semi-finished product is obtained, the adhesion-promoting layer 4 is applied onto the surface of the hot-melt adhesive layer 3 by a coating device to obtain a biaxially oriented polypropylene general-purpose precoat film. Finished product. Example 2:

A biaxially oriented polyester (BOPET) general-purpose precoat film having a finished width of 1580 mm is taken as an example for detailed description.

1) The configuration of the water-sensitive adhesive for the adhesion-promoting layer. An aqueous adhesive having good adhesion to the ink is prepared in an appropriate ratio by using an acrylic emulsion or a polyurethane emulsion and an adhesion promoter.

2) Referring to Figure 1, the finished biaxially stretched polyester (BOPET) universal precoat film has four layers, the first layer is the substrate 1, the second layer is the intermediate layer 2, and the third layer is the hot melt adhesive layer 3. The fourth layer is the adhesion promoting layer 4. The substrate 1 was a biaxially stretched polyester (BOPET) film having a width of 1600 mm; the intermediate layer 2 was made of polyethyleneimine (PEI); and the hot melt adhesive layer 3 was made of ethylene-vinyl acetate (EVA) hot melt adhesive.

The intermediate layer 2 is evenly coated on the surface of the substrate 1 by a production line composed of an extruder and a composite device, and then the hot melt adhesive layer 3 is uniformly composited on the surface of the intermediate layer 2, and then cut after compounding. In the edge system, the accumulated edges on both sides will be cut off by 20 mm, and the final product will be about 20 mm narrower than the substrate. In the width direction, the thickness deviation will be 2 μm. The thickness of the substrate 1 was selected to be 12 μm, the thickness of the intermediate layer 2 was approximately 0.015 μm (coating amount was 0.009 to 0.01 g/m ² ), and the thickness of the hot melt adhesive layer 3 was selected to be 18 μm. After obtaining the biaxially stretched polyester (BOPET) pre-coated semi-finished product, the adhesion-promoting layer 4 is applied onto the surface of the hot-melt adhesive layer 3 by a coating device to obtain a biaxially stretched polyester general-purpose precoat film. Finished product.

After the substrate 1 and the thickness of the hot melt adhesive layer 3 are appropriately combined, different products can be obtained.

The above extruders, composite equipment, coating equipment, and compounding and coating processes are well known to those skilled in the art and will not be described herein.

The general-purpose pre-coating film of the invention is manufactured by coating and extrusion compounding technology, and has good adhesion with various inks, and has excellent adhesion to various printing technologies, especially those produced by digital printing technology. The knot strength enables the embossing and rolling line after the film to be perfectly realized. It has the advantages of high versatility, high color saturation, high brightness, high tensile strength, high width and high flatness. , to meet the increasingly diverse needs of printed film coating.

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 universal pre-coated film, characterized by:

Base material, the base material is a biaxially stretched plastic film with a thickness of 10~30 m _;

Intermediate layer, the intermediary layer is combined with the base material, the intermediary layer is polyethyleneimine, and its thickness is 0.01~0.03 μm;

Hot melt adhesive layer, the hot melt adhesive layer is combined with the middle layer, the thickness of the hot melt adhesive layer is 10~35 m _; and

The tackifying layer is combined with the hot melt adhesive layer. The tackifying layer is a water-based adhesive with heat sensitivity or pressure sensitivity, and its thickness is 0.01~0.08 m.

2. The universal pre-coated film according to claim 1, characterized in that the substrate is a biaxially oriented polypropylene film, a biaxially oriented polyester film or a biaxially oriented nylon film.

3. The universal pre-coated film according to claim 1, characterized in that the hot melt adhesive layer contains ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer or ethylene-acrylic acid Methyl ester copolymer.

4. The universal pre-coated film according to claim 1, characterized in that the water-based adhesive contains an acrylic emulsion or a polyurethane emulsion, and an adhesion promoter.

5. The universal pre-coated film according to any one of claims 1 to 4, characterized in that the thickness of the base material is 12~20 m, the thickness of the intermediate layer is 0.01~0.02 m, and the hot melt adhesive layer The thickness of the adhesion layer is 15~26 μm, and the thickness of the adhesion layer is 0.05-0.07 μm.