Plastic-free environment-friendly waterproof and oil-proof label paper

Abstract

The utility model discloses plastic-free environment-friendly waterproof and oil-proof label paper which is composed of a barrier back coating, a body paper layer, an aluminum layer, a barrier surface coating and a printing ink adhesion layer which are sequentially arranged from bottom to top. The KIT oil-proof grade of the plastic-free environment-friendly waterproof and oil-proof label paper at least reaches 12 grade, and the 30-minute COBB water absorption value is smaller than or equal to 6 g / m < 2 >. According to the scheme, the barrier back coating, the aluminum layer and the barrier surface coating are respectively arranged on the front surface and the back surface of the body paper layer, so that the body paper layer is subjected to multiple barriers, water or oily substances are prevented from entering paper from the front surface or the back surface of the body paper layer, and the label paper has excellent waterproof and oil-proof functions.

Description

Technical Field

[0001] This utility model relates to the field of label paper technology, and in particular to a plastic-free, environmentally friendly, waterproof and oil-proof label paper. Background Technology

[0002] The packaging industry has introduced corresponding policies for packaging products, such as plastic bans, plastic reduction orders, and green packaging, proposing the development of packaging materials that eliminate plastics. At the same time, downstream customers of printing companies also have a demand for "paper instead of plastic." Against this backdrop, the development of plastic-free and environmentally friendly packaging materials is one of the main directions for packaging companies to maintain their continued market competitiveness in the future.

[0003] In label materials, PE coated paper and paper-plastic composite paper are commonly used as the main materials for waterproof and oil-proof label paper. However, both PE coated paper and paper-plastic composite paper contain plastic, which is difficult to degrade and does not meet environmental protection requirements. More and more printing companies are seeking environmentally friendly alternatives to plastic. Therefore, there is an urgent need to develop a plastic-free and environmentally friendly waterproof and oil-proof label paper to meet market demand. Utility Model Content

[0004] The purpose of this utility model is to propose a plastic-free, environmentally friendly, waterproof, and oil-proof label paper. While ensuring that the label paper meets the requirements for waterproof and oil-proof performance, it solves the technical problems of existing label papers using traditional plastic-containing materials such as PE coated paper and paper-plastic composite paper, which are difficult to degrade and are not environmentally friendly.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A plastic-free, environmentally friendly, waterproof, and oil-proof label paper is composed of a barrier back coating, a base paper layer, an aluminum layer, a barrier top coating, and an ink adhesion layer arranged from bottom to top.

[0007] The plastic-free, environmentally friendly, waterproof, and oil-resistant label paper has a KIT oil-resistant rating of at least level 12 and a 30-minute COBB water absorption value of ≤6g / m³. 2 .

[0008] Preferably, the thickness of the barrier back coating is 2-8 μm, and the thickness of the barrier surface coating is 6-10 μm.

[0009] Preferably, both the barrier back coating and the barrier surface coating are formed by applying and curing water-based acrylic resin.

[0010] Preferably, the thickness of the aluminum layer is 250 to 400 angstroms.

[0011] Preferably, the base paper layer is wet-strength paper, and the basis weight of the base paper layer is 50-120 g / m². 2 .

[0012] Preferably, the thickness of the ink adhesion layer is 0.5 to 1.5 μm, and the ink adhesion layer is formed by coating and curing with water-based acrylic resin.

[0013] Preferably, it further includes a connecting layer, and the connecting layer is located between the base paper layer and the aluminum layer;

[0014] The connecting layer is formed by coating and curing with water-based resin.

[0015] Preferably, the thickness of the connecting layer is 1.5 to 3 μm.

[0016] The technical solution provided by this utility model can include the following beneficial effects:

[0017] 1. This solution provides multiple layers of protection for the original paper layer by setting a barrier back coating, an aluminum layer, and a barrier surface coating on the front and back sides of the original paper layer. This prevents water or oily substances from entering the paper from the front or back of the original paper layer, giving the label paper excellent waterproof and oil-proof properties.

[0018] 2. The aluminum layer also helps to further enhance the barrier properties of the label paper, providing better barrier properties against substances such as water vapor and oxygen than conventional coatings.

[0019] 3. With the combined barrier back coating, aluminum layer, and barrier top coating in this solution, the KIT oil resistance rating of the plastic-free environmentally friendly waterproof and oil-resistant label paper reaches at least level 12, and the 30-minute COBB water absorption value is ≤6g / m³. 2 (i.e., high water resistance), the material is plastic-free, recyclable and repulped into paper, compostable and biodegradable, environmentally friendly, and has an ink adhesion layer for easy printing, which can solve the problem of traditional waterproof and oil-proof label materials such as PE coated paper and paper-plastic composite paper being difficult to degrade. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the layered structure of a plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to this utility model.

[0021] The components are: 1. Barrier back coating, 2. Base paper layer, 3. Aluminum layer, 4. Barrier top coating, 5. Ink adhesion layer, and 6. Connecting layer. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] This technical solution provides a plastic-free, environmentally friendly, waterproof and oil-proof label paper, which consists of a barrier back coating 1, a base paper layer 2, an aluminum layer 3, a barrier surface coating 4, and an ink adhesion layer 5 arranged sequentially from bottom to top.

[0024] The plastic-free, environmentally friendly, waterproof, and oil-resistant label paper has a KIT oil-resistant rating of at least level 12 and a 30-minute COBB water absorption value of ≤6g / m³. 2 .

[0025] To address the technical challenges of degrading and being environmentally unfriendly with traditional plastic-containing materials like PE-coated paper and paper-plastic composite paper, while ensuring the label paper meets waterproof and oil-resistant performance requirements, this technical solution proposes a plastic-free, environmentally friendly, waterproof, and oil-resistant label paper. Figure 1 As shown, the label consists of a barrier back coating 1, a base paper layer 2, an aluminum layer 3, a barrier top coating 4, and an ink adhesion layer 5, arranged sequentially from bottom to top. By applying the barrier back coating 1, aluminum layer 3, and barrier top coating 4 to the front and back of the base paper layer 2 respectively, multiple barriers are provided to prevent water or oily substances from entering the paper from either side, giving the label excellent waterproof and oil-proof properties. Furthermore, the aluminum layer 3 further enhances the label's barrier capabilities, offering better resistance to water vapor and oxygen than conventional coatings. Moreover, the combined arrangement of the barrier back coating 1, aluminum layer 3, and barrier top coating 4 ensures that the KIT oil-proof rating of the plastic-free environmentally friendly waterproof and oil-proof label reaches at least level 12, with a 30-minute COBB water absorption value ≤6g / m³. 2 (i.e., high water resistance), the material is plastic-free, recyclable and repulped into paper, compostable and biodegradable, environmentally friendly, and has an ink adhesion layer 5 for easy printing, which can solve the problem of traditional waterproof and oil-proof label materials such as PE coated paper and paper-plastic composite paper being difficult to degrade.

[0026] It should be noted that the KIT oil resistance rating refers to the oil resistance rating obtained by evaluating the oil resistance performance of a paper sample using a test solution with a known KIT number. The COBB absorbency value is a method for testing the absorbency of paper, used to evaluate the paper's ability to absorb liquids and the ability of liquids to spread within the paper.

[0027] To further explain, the thickness of the barrier back coating 1 is 2-8 μm, and the thickness of the barrier surface coating 4 is 6-10 μm.

[0028] In a preferred embodiment of this technical solution, the thickness of the barrier back coating 1 and the barrier surface coating 4 is optimized, which is beneficial to improve the bonding strength between the coating and other layer structures while meeting the barrier performance requirements.

[0029] To further clarify, both the barrier back coating 1 and the barrier surface coating 4 are formed by applying and curing water-based acrylic resin. Specifically, the water-based acrylic resin can be styrene-acrylic emulsion, pure acrylic emulsion, etc.

[0030] To further clarify, the thickness of the aluminum layer 3 is 250–400 angstroms.

[0031] In another preferred embodiment of this technical solution, the thickness of the aluminum layer 3 is further optimized. If the thickness of the aluminum layer 3 is too low, it will easily reduce the overall barrier performance of the label paper; if the thickness of the aluminum layer 3 is too high, it will easily lead to unclear display of the printed content when printing on the ink adhesion layer 5.

[0032] To further clarify, the base paper layer 2 is a wet-strength paper, and the basis weight of the base paper layer 2 is 50-120 g / m². 2 .

[0033] As the main material of the label paper, the base paper layer 2 needs to possess the property of not easily disintegrating when exposed to water or oily substances, in order to ensure the stability of the paper's shape. This solution uses wet-strength paper as the preferred base paper, whose inherent wet strength property prevents it from disintegrating when wet. The wet-strength paper can be uncoated wet-strength base paper or coated wet-strength art paper. In addition, the optimal paper weight also helps to ensure the strength of the label paper.

[0034] Furthermore, the thickness of the ink adhesion layer 5 is 0.5 to 1.5 μm, and the ink adhesion layer 5 is formed by coating and curing with water-based acrylic resin.

[0035] The ink adhesion layer 5 of this solution provides excellent adhesion for ink during printing, while also providing abrasion resistance. Its thickness is preferably 0.5 to 1.5 μm, which has little impact on the gloss of the aluminum layer 3, and can effectively meet the adhesion requirements of UV offset ink, ordinary offset ink, and gravure ink.

[0036] Specifically, waterborne acrylic resins can be styrene-acrylic emulsions, pure acrylic emulsions, etc.

[0037] Furthermore, it also includes a connecting layer 6, which is located between the base paper layer 2 and the aluminum layer 3;

[0038] The connecting layer 6 is formed by coating and curing with water-based resin.

[0039] To enhance the bonding strength between the base paper layer 2 and the aluminum layer 3, this solution also includes a connecting layer 6 between them. This layer serves to increase the bonding strength between the base paper layer 2 and the aluminum layer 3, and also enhances the surface gloss of the label paper.

[0040] Specifically, water-based resins can be acrylic resins, polyurethane resins, etc.

[0041] To further explain, the thickness of the connecting layer 6 is 1.5 to 3 μm.

[0042] Furthermore, in order to make the connecting layer 6 have better water resistance and higher gloss, the thickness of the connecting layer 6 has been optimized in this solution.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0045] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0049] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A plastic-free, environmentally friendly, waterproof, and oil-proof label paper, characterized in that: It consists of a barrier back coating, a base paper layer, an aluminum layer, a barrier top coating, and an ink adhesion layer arranged sequentially from bottom to top; The plastic-free, environmentally friendly, waterproof, and oil-resistant label paper has a KIT oil-resistant rating of at least level 12 and a 30-minute COBB water absorption value of ≤6g / m³. 2 .

2. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: The thickness of the barrier back coating is 2–8 μm, and the thickness of the barrier surface coating is 6–10 μm.

3. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: Both the barrier back coating and the barrier top coating are formed by applying and curing water-based acrylic resin.

4. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: The thickness of the aluminum layer is 250–400 angstroms.

5. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: The base paper layer is wet-strength paper, and the basis weight of the base paper layer is 50-120 g / m². 2 .

6. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: The thickness of the ink coating layer is 0.5 to 1.5 μm, and the ink coating layer is formed by coating and curing with water-based acrylic resin.

7. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 1, characterized in that: It also includes a connecting layer, which is located between the base paper layer and the aluminum layer; The connecting layer is formed by coating and curing with water-based resin.

8. The plastic-free, environmentally friendly, waterproof, and oil-proof label paper according to claim 7, characterized in that: The thickness of the connecting layer is 1.5 to 3 μm.

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