Base film for printing

Abstract

The utility model discloses a base film for printing, which comprises a co-extrusion base material layer comprising a first surface layer, a core layer and a second surface layer which are stacked in sequence; the ink adhesion layer is in concave-convex fit with the first surface layer; the first surface layer is provided with adsorption holes, and openings of the adsorption holes face the ink adhesion layer. The base film for printing is reasonable in structure, the structural stability and the mechanical strength of the base film are improved through co-extrusion of the base material layer, and a good supporting effect is provided for adhesion of the ink layer; the surface energy of the base material layer is improved through the ink adhesion layer, then the adhesiveness of the ink layer is improved, the absorption amount of ink is improved by combining with the adsorption holes formed in the first surface layer, and a printed pattern is prevented from falling off or fading; the ink adhesion layer and the first surface layer are matched in a concave-convex mode to further improve the structural stability of the base film, and the service life of the base film is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of membrane production technology, and in particular to a base film for printing. Background Technology

[0002] Printed films are widely used in flexible packaging, rigid packaging, and decorative materials. High-temperature lamination of printed films can lead to a decrease in strength after lamination, resulting in reduced ink adhesion. Common polyester-based films have low surface energy, resulting in poor ink adhesion. While corona treatment to create a corona layer on the film surface can help address the issues of decreased film strength and stress changes leading to reduced ink adhesion, these problems are difficult to resolve.

[0003] Therefore, it is necessary to improve the printing base film in the existing technology. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide a printing base film. By co-extruding the substrate layer, the structural stability and mechanical strength of the base film are improved, providing good support for the adhesion of the ink layer. The surface energy of the substrate layer is increased by the ink adhesion layer, thereby improving the adhesion of the ink layer. Combined with the adsorption pores provided in the first surface layer, the ink absorption is increased, preventing the printed pattern from falling off or fading. The uneven cooperation between the ink adhesion layer and the first surface layer further improves the structural stability of the base film and increases its service life.

[0005] To achieve the above-mentioned technical effects, the technical solution of this utility model is: a printing base film, comprising:

[0006] The co-extruded substrate layer includes a first surface layer, a core layer, and a second surface layer stacked sequentially.

[0007] The ink adhesion layer is in contact with the uneven surface of the first surface layer;

[0008] The first surface layer has adsorption pores, with the openings of the adsorption pores facing the ink adhesion layer.

[0009] A preferred technical solution is that the ink adhesion layer includes a first unit adhesion layer and a second unit adhesion layer, the second unit adhesion layer is close to the co-extruded substrate layer, and both the first unit adhesion layer and the second unit adhesion layer contain silica particles, wherein the particle size of the silica particles in the first unit adhesion layer is smaller than that in the second unit adhesion layer.

[0010] The preferred technical solution is that the first surface layer is a reinforced surface layer, and the second surface layer is an anti-adhesion surface layer.

[0011] A preferred technical solution is that the ink adhesion layer is an acrylic-modified polyurethane layer.

[0012] The preferred technical solution is that the material of the co-extruded substrate layer is polyethylene terephthalate.

[0013] The preferred technical solution is that the thickness of the co-extruded substrate layer is 50~125μm, and the thickness of the ink adhesion layer is 2~6μm.

[0014] The preferred technical solution is that the thickness ratio of the first surface layer, the core layer and the second surface layer is (4~4.5):(91~92):(4~4.5).

[0015] A preferred technical solution is that the thickness ratio of the first unit attachment layer to the second unit attachment layer is (1~2):1.

[0016] The advantages and beneficial effects of this utility model are as follows:

[0017] The printing base film has a reasonable structure. The co-extruded substrate layer improves the structural stability and mechanical strength of the base film, providing good support for the adhesion of the ink layer. The ink adhesion layer increases the surface energy of the substrate layer, thereby improving the adhesion of the ink layer. Combined with the adsorption pores set in the first surface layer, the ink absorption is increased, preventing the printed pattern from falling off or fading. The interplay between the ink adhesion layer and the uneven surface of the first surface layer further improves the structural stability of the base film and extends its service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the printing base film of this utility model;

[0019] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0020] In the figure: 1. Co-extruded substrate layer; 2. Ink adhesion layer; 10. Core layer; 11. First surface layer; 12. Second surface layer; 21. First unit adhesion layer; 22. Second unit adhesion layer. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] The term "surface layer" is used with reference to the normal use state of the printing base film and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] like Figures 1-2 As shown, the printing base film of this utility model includes a co-extruded substrate layer 1 and an ink adhesion layer 2. The co-extruded substrate layer 1 includes a first surface layer 11, a core layer 10 and a second surface layer 12 stacked in sequence. The ink adhesion layer 2 is in concave-convex fit with the first surface layer 11. The first surface layer 11 has adsorption holes (not shown), and the openings of the adsorption holes face the ink adhesion layer 2.

[0025] The co-extruded substrate layer 1 improves the structural stability and mechanical strength of the base film, providing good support for the adhesion of the ink layer. The ink adhesion layer 2 increases the surface energy of the substrate layer 1, thereby improving the adhesion of the ink layer. Combined with the adsorption pores provided in the first surface layer 11, the ink absorption is increased, preventing the printed pattern from peeling off or fading. The uneven cooperation between the ink adhesion layer 2 and the first surface layer 11 further improves the structural stability of the base film and increases its service life.

[0026] The recessed portion of the first surface layer 11 is obtained by hot pressing with a mold. For biaxially oriented films, molding is required before film stretching.

[0027] To improve the absorption rate and amount of ink in the ink adhesion layer 2, the common method is to increase the thickness of the ink adhesion layer. However, as the coating thickness increases, the adhesion between the ink adhesion layer and the co-extruded substrate layer decreases, making delamination more likely. Furthermore, thicker coatings require higher energy for complete curing, increasing the requirements for the high-temperature resistance and deformation resistance of the co-extruded substrate layer 1. Insufficient curing energy, on the other hand, easily leads to coating peeling. Further, the ink adhesion layer 2 includes a first unit adhesion layer 21 and a second unit adhesion layer 22. The second unit adhesion layer 22 is located close to the co-extruded substrate layer 1. Both the first unit adhesion layer 21 and the second unit adhesion layer 22 contain silica particles, with the silica particles in the first unit adhesion layer 21 having a smaller particle size than those in the second unit adhesion layer 22. Because silica particles of different sizes are distributed in the first unit adhesion layer 21 and the second unit adhesion layer 22, the surfaces of the two unit adhesion layers have a microscopic uneven structure, thereby increasing the adhesion between the first unit adhesion layer 21 and the second unit adhesion layer 22. Small-sized silica particles have a small specific surface area and strong adsorption capacity, which helps to improve the adsorption amount and adsorption rate of ink by the ink adhesion layer 2. By adjusting the particle size of silica particles in the first unit adhesion layer 21 and the second unit adhesion layer 22, the haze and mechanical strength of the base film can also be controlled. Specifically, the silica particles in the first unit adhesion layer 21 have a particle size of 200~400nm, and the silica particles in the second unit adhesion layer 22 have a particle size of 1~3μm.

[0028] To enhance the mechanical strength of the co-extruded substrate layer and optimize the adsorption pores of the first surface layer, the first surface layer 11 is a reinforcing surface layer, and the second surface layer 12 is an anti-blocking surface layer. The reinforcing surface layer is achieved by adding calcium carbonate masterbatch and light calcium carbonate to the polyester raw material. The calcium carbonate masterbatch primarily functions to decompose and generate micropores, creating adsorption pores; the light calcium carbonate primarily improves the surface strength of the base film and enhances the anti-blocking properties of the surface layer, facilitating base film winding. The anti-blocking surface layer is achieved by adding silica particles to the polyester raw material, which not only solves the problem of surface adhesion and difficulty in winding of the base film but also improves the strength and smoothness of the base film surface layer.

[0029] The ink adhesion layer 2 is an acrylic-modified polyurethane layer. The acrylic resin in this layer exhibits excellent weather resistance and UV resistance, effectively preventing aging and discoloration caused by prolonged exposure to sunlight. The modified polyurethane layer typically displays better flexibility and tear strength while maintaining high hardness and abrasion resistance. The acrylic component helps improve the adhesion between the coating and the substrate, forming a strong bond even on complex or irregular surfaces. Acrylic-modified polyurethane often dries faster, shortening construction time and production cycles. It also shows good resistance to most solvents, acid and alkali solutions, and other chemicals, extending the product's lifespan. By adjusting the ratio of acrylic to polyurethane, the gloss and smoothness of the coating can be controlled to meet different aesthetic requirements. Furthermore, acrylic-modified polyurethane typically has better waterproofing properties, effectively preventing moisture penetration and protecting the internal structure from moisture erosion.

[0030] Among them, the co-extruded substrate layer 1 is made of polyethylene terephthalate, which has good high temperature resistance and good dimensional stability, preventing the substrate layer from deforming and aging during the ink drying process, thus preventing the ink layer from falling off.

[0031] The co-extruded substrate layer 1 has a thickness of 50~125μm, and the ink adhesion layer 2 has a thickness of 2~6μm. The thickness ratio of the first surface layer 11, the core layer 10, and the second surface layer 12 is (4~4.5):(91~92):(4~4.5). Optimizing the thickness of the first surface layer 11, the core layer 10, and the second surface layer 12 improves the mechanical strength and optical properties of the co-extruded substrate layer 1. The thickness ratio of the first unit adhesion layer 21 and the second unit adhesion layer 22 is (1~2):1. By adjusting the thickness of the first unit adhesion layer 21 and the second unit adhesion layer 22, the ink adsorption rate and structural stability can be controlled.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A printing base film, characterized in that, include: The co-extruded substrate layer includes a first surface layer, a core layer, and a second surface layer stacked sequentially. The ink adhesion layer is in contact with the uneven surface of the first surface layer; The first surface layer has adsorption pores, with the openings of the adsorption pores facing the ink adhesion layer.

2. The printing base film according to claim 1, characterized in that, The ink adhesion layer includes a first unit adhesion layer and a second unit adhesion layer. The second unit adhesion layer is close to the co-extruded substrate layer. Both the first unit adhesion layer and the second unit adhesion layer contain silica particles. The silica particles in the first unit adhesion layer have a smaller particle size than those in the second unit adhesion layer.

3. The printing base film according to claim 1 or 2, characterized in that, The first surface layer is a reinforced surface layer, and the second surface layer is an anti-adhesion surface layer.

4. The printing base film according to claim 1 or 2, characterized in that, The ink adhesion layer is an acrylic-modified polyurethane layer.

5. The printing base film according to claim 1 or 2, characterized in that, The co-extruded substrate layer is made of polyethylene terephthalate.

6. The printing base film according to claim 2, characterized in that, The co-extruded substrate layer has a thickness of 50~125μm, and the ink adhesion layer has a thickness of 2~6μm.

7. The printing base film according to claim 6, characterized in that, The thickness ratio of the first surface layer, the core layer, and the second surface layer is (4~4.5):(91~92):(4~4.5).

8. The printing base film according to claim 6, characterized in that, The thickness ratio of the first unit attachment layer to the second unit attachment layer is (1~2):1.

Images