Direct plating composite paper

Abstract

The utility model relates to direct plating composite paper which sequentially comprises uncoated paper, direct plating bottom paper, a direct plating bottom coating, an aluminum plating layer and a direct plating surface coating from inside to outside, and a composite glue layer is arranged between the uncoated paper and the direct plating bottom paper. The outer side face of the direct-plating bottom paper and the aluminum-plated layer are compounded through the direct-plating bottom coating, the direct-plating surface coating is arranged on the surface of the aluminum-plated layer, and the uncoated paper is arranged on the inner side face of the direct-plating bottom paper in an attached mode through the composite glue layer, so that the formed direct-plating composite paper does not contain a plastic film, is good in environment friendliness and can be recycled; the direct-plated bottom paper and the aluminum-plated layer are compounded by using the direct-plated bottom coating, and the direct-plated bottom paper and the uncoated paper are stably compounded through the compound glue layer, so that the problem that existing aluminum-plated packaging paper is easy to crack and explode is solved, and the aluminum-plated packaging paper is widely applied to packaging of food, daily necessities, cosmetics and tobacco and wine.

Description

Technical Field

[0001] The present application relates to the field of packaging paper, and in particular to a direct-plated composite paper. Background Art

[0002] At present, in order to improve the texture and packaging stability of packaging materials, most of the packaging is made of coated paper. The coated paper is made by aluminum-plating the surface of a plastic film to form an aluminized film, and then using an adhesive to compound the aluminized film with the paper. However, due to the presence of plastic film, it is less environmentally friendly. In recent years, due to environmental protection requirements, vacuum transfer coated paper is currently used on the market to replace traditional coated paper. Vacuum transfer aluminized paper is made by coating the surface of a plastic film with a transfer-type water-based paint, and then aluminum is plated on one side of the plastic film with the paint to form an aluminized film, and then an adhesive is used to compound the aluminized film with the paper, and finally the plastic film is peeled off.

[0003] Vacuum transfer aluminized paper does not contain plastic film and is environmentally friendly. However, since the aluminized film is directly compounded with the paper, and in order to achieve the composite flatness of the aluminized film and the paper, a white card base paper with a surface coated with flatness is generally used for bonding. However, the white card base paper with a surface coated is prone to color popping during bending and use, which limits the use of the existing aluminized packaging paper. Therefore, the applicant believes that the existing aluminized packaging paper needs to be further improved. Utility Model Content

[0004] In order to solve the problem that the existing aluminized packaging paper contains plastic film and has low environmental protection, and the vacuum transfer aluminized paper without plastic film is prone to color popping, which limits the use of the existing aluminized packaging paper, the present application provides a direct-plated composite paper.

[0005] The present application provides a direct-plated composite paper, which adopts the following technical solution:

[0006] A direct-plated composite paper comprises, from the inside to the outside, uncoated paper, direct-plated base paper, direct-plated base coating, aluminum plating layer and direct-plated top coating, wherein a composite glue layer is arranged between the uncoated paper and the direct-plated base paper.

[0007] By adopting the above technical scheme, a direct-plated primer coating is arranged on the outer side of the direct-plated base paper, so that the direct-plated base paper has good flatness, which is convenient for compounding the aluminum-plated layer on the direct-plated base paper, and the direct-plated base paper and the aluminum-plated layer are stably compounded by the direct-plated primer coating, and a direct-plated surface coating is arranged on the outer side of the aluminum-plated layer, the direct-plated surface coating protects the aluminum-plated layer, and a composite glue layer is used to compound the uncoated paper on the inner side of the direct-plated base paper. The direct-plated composite paper of the present application has good gloss and smoothness, and has good firmness and printability. Compared with traditional aluminum-plated packaging paper, it does not contain plastic film, has good environmental protection, and can be recycled. The direct-plated primer coating is used instead of conventional adhesive for compounding between the direct-plated base paper and the aluminum-plated layer, and the composite glue layer is used to stably compound the direct-plated base paper and the uncoated paper, so that the direct-plated composite paper is not easy to crack and burst. It has a wide range of use and can be widely used in food, daily necessities, cosmetics, and tobacco and alcohol packaging.

[0008] Optionally, the uncoated paper includes any one of pure wood pulp kraft paper, white paper and grey paper.

[0009] By adopting the above technical solution, the direct-plated composite paper made using the above uncoated paper has good compression resistance and tear resistance.

[0010] Optionally, the uncoated paper has a grammage of 23-60 g / m 2 .

[0011] 23-60g / m 2 The surface smoothness of uncoated paper is obtained by super pressing during the papermaking process. The uncoated paper with the above gram weight has good flatness, good flexibility and is not easy to burst color; if the gram weight is too high (such as 300g / m 2 ) has a poor forming effect, and its stiffness and softness will be reduced after over-pressing.

[0012] Optionally, a plurality of recessed holes are formed on a side of the uncoated paper close to the direct-plated base paper.

[0013] By adopting the above technical scheme, since the uncoated paper is not coated or glued on the surface of the paper fiber, the surface has a roughness presented by a number of concave holes. The composite glue layer can penetrate and embed into the concave holes on the surface of the uncoated paper, so that the composite glue layer can adhere to the surface stably, thereby improving the firmness of the bonding between the direct-plated base paper and the uncoated paper, and improving the straightness of the uncoated paper, making the uncoated paper and the direct-plated base paper easy to bend without cracks, further improving the wide range of use.

[0014] Optionally, the direct-plated base paper is 120-400g / m 2 white cardboard.

[0015] By adopting the above technical scheme, the direct-plated base paper with better specifications is convenient for the direct-plated base coating to adhere stably and form better flatness. After the direct-plated base paper is coated, the aluminum plating process can obtain a mirror-like aluminum plating effect with good flatness and high gloss. Moreover, since the uncoated paper is not coated with a top coating, after gluing with a composite glue layer, it is stably bonded to the aluminum plating layer, and the obtained direct-plated composite paper is fold-resistant and not easy to burst.

[0016] Optionally, the direct-plated base coating is any one of an acrylic resin adhesive coating, a PVB resin adhesive coating and a PVA resin adhesive coating.

[0017] By adopting the above technical scheme, the direct-plated base coating has good adhesion and uniformity, and has good flatness, glossiness and brightness when coated on the surface of the direct-plated base paper, and has good adhesion to the direct-plated base paper, and can stably composite the direct-plated base paper and the coating layer, so that the direct-plated base paper and the coating layer of the direct-plated composite paper are not prone to cracks or color explosion when bent.

[0018] Optionally, the thickness of the aluminum plating layer is 15-35 nm.

[0019] By adopting the above technical solution, the aluminum-plated layer with optimal thickness has better composite stability, firmness and sealing, is less likely to crack when bent, and improves the overall quality of the direct-plated composite paper.

[0020] Optionally, the direct-plating surface coating is any one of an acrylic resin adhesive coating, a PVB resin adhesive coating and a PVA resin adhesive coating.

[0021] By adopting the above technical solution, the direct-plated surface coating not only protects the aluminum-plated layer, but also has good flatness, smoothness and softness.

[0022] Optionally, the composite glue layer is a nanocellulose glue layer.

[0023] By adopting the above technical scheme, compared with the flatness obtained by traditionally applying a kaolin glue layer or a white latex layer, the above composite glue layer is soft and flat, and has better adhesion stability to direct-plated base paper and uncoated paper. The obtained direct-plated composite paper has a firm fit and is not prone to cracks and color bursting when bent.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The present application relates to a direct-plated composite paper, which improves the surface flatness of the direct-plated composite paper by attaching a direct-plated primer coating on the outer side of the direct-plated composite paper, and then composites the side of the direct-plated composite paper with the aluminum-plated layer, and the surface of the aluminum-plated layer is attached with a direct-plated surface coating to protect the aluminum-plated layer, and the inner side of the direct-plated composite paper is composited with uncoated paper through a composite glue layer, so that the direct-plated composite paper has good softness and firmness. The direct-plated composite paper of the present application has good gloss and smoothness, and has good firmness and printability. Compared with traditional aluminum-plated packaging paper, it does not contain plastic film, has good environmental protection, and can be recycled. The direct-plated primer coating is used instead of conventional adhesive for composite between the direct-plated composite paper and the aluminum-plated layer, and the composite glue layer is used to stably bond the direct-plated composite paper and the uncoated paper, so that the direct-plated composite paper is not easy to crack or burst, and can be widely used in food, daily necessities, cosmetics, and tobacco and alcohol packaging.

[0026] 2. By opening concave holes on the outer side of the uncoated paper, the composite stability of the uncoated paper and the direct-plated base paper is improved, and the stability of the direct-plated composite paper is further improved, and cracks are less likely to occur when bent.

[0027] 3. Using any one of polyacrylic acid resin adhesive coating, PVB resin adhesive coating and PVA resin adhesive coating as the direct-plating bottom coating, the aluminum-plated layer and the direct-plated bottom paper can be stably compounded, and have good softness and flatness, so that the direct-plated composite paper is not prone to bending, cracking and color bursting. At the same time, using any one of polyacrylic acid resin adhesive coating, PVB resin adhesive coating and PVA resin adhesive coating as the direct-plating top coating, the aluminum-plated layer is further protected, so that the performance of the direct-plated composite paper is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a direct-plated composite paper according to Example 1 of the present application.

[0029] Figure 2 It is a schematic structural diagram of a direct-plated composite paper according to Example 2 of the present application.

[0030] Explanation of the accompanying drawings: 1. Uncoated paper; 11. Concave hole; 2. Directly plated base paper; 3. Directly plated base coating; 4. Aluminum plating layer; 5. Directly plated top coating; 6. Composite glue layer. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-2 This application is described in further detail.

[0032] Example 1

[0033] Example 1 discloses a direct-plated composite paper.

[0034] Reference Figure 1A direct-plated composite paper includes uncoated paper 1, a composite glue layer 6, a direct-plated base paper 2, a direct-plated base coating 3, an aluminum-plated layer 4 and a direct-plated top coating 5. The uncoated paper 1, the composite glue layer 6, the direct-plated base paper 2, the direct-plated base coating 3, the aluminum-plated layer 4 and the direct-plated top coating 5 are arranged in sequence from the inside to the outside.

[0035] Continue to refer to Figure 1 The uncoated paper 1 includes pure wood pulp kraft paper, white cardboard and gray cardboard. The uncoated paper 1 of this embodiment is preferably pure wood pulp kraft paper with a gram weight of 23-60g / m 2 Specifically, the weight of the uncoated paper 1 can be 23 g / m 2 , 27g / m 2 , 35 g / m 2 , 40 g / m 2 , 45 g / m 2 , 50 g / m 2 , 55 g / m 2 or 60g / m 2 The weight of the uncoated paper 1 in this embodiment is 40 g / m 2 .

[0036] Continue to refer to Figure 1 The composite glue layer 6 is a nanocellulose glue layer, specifically, the nanocellulose glue layer is 1.2g / m 2 A coating amount of glue is applied to the outer side of the uncoated paper 1 to form a composite glue layer 6.

[0037] Continue to refer to Figure 1 , direct plating base paper 2 is 120-400g / m 2 White cardboard, specifically, the direct-plated base paper 2 can be 120g / m 2 , 180g / m 2 , 250g / m 2 , 300g / m 2 , 350g / m 2 or 400g / m 2 The direct-plated base paper in this embodiment is 180g / m 2 The outer side of the uncoated paper 1 and the inner side of the direct-plated base paper 2 are bonded and laminated by a composite glue layer 6.

[0038] Continue to refer to Figure 1 The direct-plated bottom coating 3 is any one of an acrylic resin adhesive coating, a PVB resin adhesive coating and a PVA resin adhesive coating. The direct-plated bottom coating 3 in this embodiment is preferably an acrylic resin adhesive coating. Specifically, the acrylic resin adhesive is coated at a temperature of 1.6 g / m 2A coating amount of glue is coated on the surface of the PET film, and then the PET film is pressed to the outer surface of the direct-plated base paper 2. After the PET film is torn off, the direct-plated base coating 3 is evenly adhered to the outer surface of the direct-plated base paper 2 to form the direct-plated base coating 3.

[0039] Continue to refer to Figure 1 The aluminum-plated layer 4 is a vacuum aluminum-plated layer, and the thickness of the aluminum-plated layer 4 is 15-35 nm. Specifically, the thickness of the aluminum-plated layer 4 can be 15 nm, 20 nm, 25 nm, 30 nm or 35 nm. The thickness of the aluminum-plated layer 4 in this embodiment is 20 nm.

[0040] Continue to refer to Figure 1 The direct-plated top coating 5 is any one of an acrylic resin coating, a PVB resin coating and a PVA resin coating. The direct-plated bottom coating 3 in this embodiment is preferably an acrylic resin coating. Specifically, the acrylic resin is coated with 1.2 g / m 2 The amount of glue is coated on the outer side of the aluminum plating layer 4 to form a direct plating surface coating 5.

[0041] The implementation principle of Example 1 is: when packaging and using, the direct-plated surface coating 5 of the direct-plated composite paper faces outward, and the uncoated paper 1 faces inward for packaging. The direct-plated composite paper of the present application does not contain plastic film, has good environmental protection, can be recycled, is not prone to cracks and color bursts, and can be widely used in food, daily necessities, cosmetics, tobacco and alcohol packaging.

[0042] Example 2

[0043] Example 2 discloses a direct-plated composite paper, which is different from Example 1 in that Figure 2 ,

[0044] The implementation principle of Example 2 is as follows: a plurality of concave holes 11 are concavely arranged on one side of the uncoated paper 1 close to the direct-plated base paper 2, and the height of the concave holes 11 is 10-20µm. Specifically, the height of the concave holes 11 can be 10µm, 12µm, 14µm, 16µm, 18µm or 20µm. In this embodiment, the height of the concave holes 11 is 12µm, and the distribution density of the concave holes 11 is 15-30 / cm 2 Specifically, the distribution density of the concave holes 11 can be 15 / cm 2 , 18 pieces / cm 2 , 20 pieces / cm 2 , 23 pieces / cm 2 , 25 pieces / cm 2 , 27 pieces / cm 2 or 30 pieces / cm 2 The distribution density of the concave holes 11 in this embodiment is 20 / cm 2 .

[0045] The implementation principle of Example 2 is: through the setting of the concave hole 11, the uncoated paper 1 and the direct-plated base paper 2 can be stably bonded and have good softness, so that the uncoated paper 1 and the direct-plated base paper 2 of the direct-plated composite paper are not prone to cracks when bent, and further the direct-plated composite paper is not prone to cracks and color bursting, thereby improving the wide application of the direct-plated composite paper.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A direct-plated composite paper, characterized in that: The paper comprises, from the inside to the outside, uncoated paper (1), direct-plated base paper (2), a direct-plated base coating (3), an aluminum coating layer (4) and a direct-plated top coating (5), wherein a composite glue layer (6) is provided between the uncoated paper (1) and the direct-plated base paper (2).

2. The direct-plated composite paper according to claim 1, characterized in that: The uncoated paper (1) comprises any one of pure wood pulp kraft paper, white paper and grey paper.

3. The direct-plated composite paper according to claim 2, characterized in that: The uncoated paper (1) has a grammage of 23-60 g / m 2 .

4. The direct-plated composite paper according to any one of claims 1 to 3, characterized in that: A plurality of recessed holes (11) are provided on a side of the uncoated paper (1) close to the direct-plated base paper (2).

5. The direct-plated composite paper according to claim 1, characterized in that: The direct-plated base paper (2) is 120-400 g / m 2 white cardboard.

6. The direct-plated composite paper according to claim 1, characterized in that: The direct-plated bottom coating (3) is any one of an acrylic resin adhesive coating, a PVB resin adhesive coating and a PVA resin adhesive coating.

7. The direct-plated composite paper according to claim 1, characterized in that: The thickness of the aluminum plating layer (4) is 15-35 nm.

8. The direct-plated composite paper according to claim 1, characterized in that: The direct-plating surface coating (5) is any one of an acrylic resin adhesive coating, a PVB resin adhesive coating and a PVA resin adhesive coating.

9. The direct-plated composite paper according to claim 1, characterized in that: The composite glue layer (6) is a nanocellulose glue layer.

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