Black mirror surface high-flexibility composite paper

Abstract

The utility model provides black mirror surface high-flexibility composite paper, which comprises a bottom paper layer and a coating structure thereof, the coating structure comprises a high-smoothness coating positioned on the bottom paper layer, a glue coating is arranged on the high-smoothness coating, a metal vacuum plating is arranged on the glue coating, a transparent black coating is arranged on the metal vacuum plating, and the transparent black coating is arranged on the bottom paper layer. The black mirror surface high-flexibility composite paper does not contain a PET (Polyethylene Terephthalate) film layer, so that the phenomena of delamination, bubbles, orange peel and the like of the composite paper after being folded for multiple times are avoided, the high flexibility of the composite paper is realized, and meanwhile, the undesirable phenomena of curling and the like of the composite paper are avoided; the production process can be completed at a time on a continuous operation production line, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to packaging materials, in particular to high-flexibility composite paper with black mirror visual effect. Background Art

[0002] Black mirror paper has become an important choice for all kinds of packaging design due to its unique packaging visual effect. It is used in many types of high-end packaging such as tobacco, cosmetics, daily necessities, etc.

[0003] The technical difficulty of black mirror composite paper lies in the combination precision between the coatings, which is prone to defects such as delamination, bubbles, orange peel, shrinkage, pinholes, and shrinkage. In the industry, black mirror paper is generally produced by lamination. A transparent color layer with black dye is coated on one side of the PET film, and then vacuum aluminum is plated. Then, an adhesive is coated on the metal aluminum layer and laminated with paper or paperboard. Since the PET film layer has a certain thickness, after lamination with paper or paperboard, delamination, bubbles, orange peel and other undesirable phenomena are prone to occur between the PET film layer and the vacuum aluminum and the paper when folded. In different humidity environments, due to the inconsistent expansion rate of the PET film layer and the paper or paperboard after moisture absorption, the composite paper curls. Utility Model Content

[0004] The utility model aims to provide a black mirror-surface high-flexibility composite paper, which can avoid delamination, bubbles and orange peel between composite layers, and the production process of the composite paper can be completed in one step, thereby greatly improving the production efficiency.

[0005] The black mirror-surface high-flexibility composite paper of the utility model comprises a base paper layer and a coating structure thereof, wherein the coating structure comprises a high-smoothness coating on the base paper layer, a glue coating on the high-smoothness coating, a metal vacuum coating on the glue coating, and a transparent black coating on the metal vacuum coating.

[0006] The base paper layer is preferably copperplate paper, light coated paper, matte powder paper, offset paper or white cardboard with a thickness of 100-500 um.

[0007] The high-smoothness coating is preferably a coating with a thickness of 1-4 um and a surface roughness of ≤ Ra0.2 um.

[0008] The transparent black coating is preferably a high molecular polymer coating with a thickness of 1-2 um and containing a black dye.

[0009] The back of the base paper layer may also have a moisturizing layer, which is a polyvinyl alcohol coating with a thickness of 0.2-1 um.

[0010] The transparent black coating may also be provided with a varnish layer, which is a modified cellulose coating with a thickness of 0.8-1.6 um.

[0011] The black mirror high-flexibility composite paper of the utility model does not contain a PET film layer, ensuring that the composite paper will not have delamination, bubbles, orange peel and other phenomena after being folded multiple times, achieving its high flexibility and avoiding undesirable phenomena such as curling of the composite paper. Except for the base paper layer of the composite paper which is a prefabricated profile, the other layers are generated by coating. The production process can be completed at one time on a continuously running production line, greatly improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the coating structure of one implementation method of the utility model. DETAILED DESCRIPTION

[0013] Figure 1 The composite paper shown comprises a base paper layer 2, a moisturizing layer 1 on the back of the base paper layer 2, and a high-smoothness coating 3, a glue coating 4, a metal vacuum coating 5, a transparent black coating 6 and a varnish layer 7 on the front of the base paper layer 2 in sequence.

[0014] The moisturizing layer 1 is a polyvinyl alcohol coating. The polyvinyl alcohol is dissolved in water to become a coating liquid, which is applied to the back of the base paper layer 2 and becomes a film coating after drying. The coating thickness is 0.2-1um, which plays a role in moisturizing and blocking water vapor, avoiding curling and local bulging caused by moisture absorption of the composite paper, so that the composite paper of the utility model remains flat and the four sides are neat after multiple layers are stacked.

[0015] The bottom paper layer 2 is a paper with good flatness, such as coated paper, light coated paper, matt powder paper, offset paper, white cardboard, with a thickness of 60-600um, preferably 200-500um, and a weight of 100-250g / m 2 Copperplate cardboard or white cardboard. If used as tobacco packaging, white cigarette cardboard with a thickness of 250-350um can be used.

[0016] The high smoothness coating 3 is a coating with a thickness of 1-4um and a surface roughness of ≤Ra0.2um. The coating can be made of a polymer material such as acrylic resin as the main component, and a leveling agent with high leveling performance such as a water-soluble silicone additive is added to the coating. After the coating is applied, it is dried and rolled to form a flat and smooth coating.

[0017] The glue coating 4 is a transparent coating formed by coating with a coating liquid compounded with styrene-butadiene rubber and acrylic resin and drying. The thickness of the coating is 1-4um. The coating has good flexibility, which can improve the bonding strength with the high-smoothness coating 3 below and the metal vacuum coating 5 above, and improve the folding resistance of the composite paper. When the composite paper is used as tobacco packaging, it will not burst if it is folded 180° three times at the indentation position of the cigarette package.

[0018] The metal vacuum coating 5 is vacuum-deposited, and the coating material includes metal aluminum and zinc sulfide, with a thickness of 30-50 nm. Since the high-smoothness coating 3 and the glue coating 4 provide a flat and smooth base surface, the coating becomes a flat mirror surface.

[0019] The transparent black coating 6 is a polymer compound coating containing black dye, and adopts a polymer compound coating such as a polyurethane resin coating, in which an oil-soluble black dye or a combination dye with a black combination effect is added, and the thickness is 1-2um. External light passes through the transparent black coating 6 and irradiates the metal vacuum coating 5 of the mirror surface, and black reflected light appears, and the composite paper shows a high visual effect of a black mirror surface.

[0020] The varnish layer 7 is a transparent coating whose main component is modified cellulose and has a thickness of 0.8-1.6 um. The varnish layer 7 can meet the post-processing requirements, such as offset printing or gravure printing, and can withstand temperatures up to 120° C. It can be printed with UV ink multiple times, and the color layer does not fade after drying.

Claims

1. A black mirror-surface high-flexibility composite paper, comprising a base paper layer (2) and a coating structure thereof, characterized in that: The coating structure comprises a high-smoothness coating (3) located on the base paper layer (2), a glue coating (4) on the high-smoothness coating (3), a metal vacuum coating (5) on the glue coating (4), and a transparent black coating (6) on the metal vacuum coating (5).

2. The black mirror-surface high-flexibility composite paper according to claim 1, characterized in that: The back side of the base paper layer (2) also has a moisturizing layer (1).

3. The black mirror-surface high-flexibility composite paper according to claim 1 or 2, characterized in that: A clear varnish layer (7) is also provided on the transparent black coating (6).

4. The black mirror-surface high-flexibility composite paper according to claim 1 or 2, characterized in that: The base paper layer (2) is copperplate paper, light coated paper, matte powder paper, offset paper or white cardboard with a thickness of 100-500 um.

5. The black mirror-surface high-flexibility composite paper according to claim 1 or 2, characterized in that: The high-smoothness coating (3) is a coating with a thickness of 1-4 um and a surface roughness of ≤ Ra0.2 um.

6. The black mirror-surface high-flexibility composite paper according to claim 1 or 2, characterized in that: The transparent black coating (6) is a transparent high molecular polymer coating with a thickness of 1-2 um and containing a black dye.

7. The black mirror-surface high-flexibility composite paper according to claim 3, characterized in that: The varnish layer (7) is a modified cellulose coating with a thickness of 0.8-1.6 um.

8. The black mirror-surface high-flexibility composite paper according to claim 2, characterized in that: The moisturizing layer (1) is a polyvinyl alcohol coating with a thickness of 0.2-1 um.

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