Anti-blocking paper and paper bag

Abstract

The utility model discloses a kind of paper and paper bag of anti-adhesion, anti-adhesion paper, including paper layer, first starch layer, second starch layer and surface layer, at least one layer is provided to the first starch layer and the second starch layer. The paper of the utility model is through the setting of first starch layer, second starch layer and surface layer, the effect of tearing off without residue when contacting with PE film is realized, avoid the problems such as food safety and appearance defect;Gradient structure (first starch layer+second starch layer) can inhibit starch high-temperature gelatinization, the temperature resistance is improved from 80 DEG C of traditional paraffin coating to 100 DEG C, meet industrial heat sealing process demand (such as 150-220 DEG C contact scene);Biobased material (starch, starch fine, polyvinyl alcohol), without silicon oil / paraffin migration risk, meet food safety standards, satisfy green packaging trend;Physical structure anti-adhesion design avoids the interference of chemical release agent to printing / complex process, can directly adapt existing coating and embossing production line, and cost is lower.

Description

Technical Field

[0001] This utility model relates to an anti-sticking paper, and more particularly to an anti-sticking paper and paper bag. Background Technology

[0002] Industrial or commercial paper bags generally use special or unique paper. During the heat sealing process of making paper bags, the paper layer and PE film are in direct contact under high temperature (usually 150-220℃) and pressure. This causes the surface fibers of the paper layer to be torn off by the PE film due to adhesion during heat sealing, leaving residues at the PE film seal, which may cause food safety issues and appearance defects.

[0003] In existing technologies, silicone oil or paraffin wax is used as a release agent, but it has the following drawbacks: silicone oil is expensive and affects subsequent printing / lamination processes; paraffin wax has poor temperature resistance (generally not exceeding 80℃), is prone to migration and failure at high temperatures, and is not environmentally friendly enough to meet the requirements of green packaging and food safety. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a paper and paper bag that prevents sticking, thus solving the problem of easy residue.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0006] This utility model provides an anti-adhesion paper, comprising a paper layer, a first starch layer, a second starch layer and a surface layer, wherein at least one of the first starch layer and the second starch layer is provided;

[0007] The first starch layer is laminated to the paper layer, wherein the outermost first starch layer is laminated with the second starch layer;

[0008] The outermost second starch layer is composited with a surface layer, wherein,

[0009] The surface layer is made of polyvinyl alcohol.

[0010] As a preferred embodiment of the present invention, the first starch layer is formed by starch coating, wherein the thickness is 10-15 μm.

[0011] In a preferred embodiment of this invention, the second starch layer is formed by coating with starch dextrin, wherein the thickness is 5-10 μm.

[0012] In a preferred embodiment of this invention, the thickness of the surface layer is 15-25 μm, wherein...

[0013] The outer surface of the surface layer has a rough texture.

[0014] As a preferred embodiment of this invention, the roughness Raμm of the surface rough texture is greater than 3.5.

[0015] As a preferred embodiment of this invention, the surface of the surface layer is formed by adjacent protrusions and depressions to create a rough texture.

[0016] Preferably, the paper layer is made of kraft paper.

[0017] This utility model also provides a paper bag made of the aforementioned anti-sticking paper.

[0018] The beneficial effects of this invention are as follows: The paper of this invention, through the arrangement of a first starch layer, a second starch layer, and a surface layer, achieves a residue-free tear-off effect when in contact with PE film, avoiding issues such as food safety and appearance defects; the gradient structure (first starch layer + second starch layer) can inhibit high-temperature gelatinization of starch, increasing the temperature tolerance from 80℃ (traditional paraffin coating) to 100℃, meeting the requirements of industrial heat-sealing processes (such as contact scenarios at 150-220℃); the bio-based materials (starch, starch concentrate, polyvinyl alcohol) eliminate the risk of silicone oil / paraffin migration, comply with food safety standards, and meet the trend of green packaging; the physical structure's anti-adhesion design avoids interference from chemical release agents on printing / lamination processes, allowing direct adaptation to existing coating and embossing production lines at a lower cost. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0020] Figure 2 This is the second structural schematic diagram of the present invention;

[0021] In the diagram: 100, paper layer; 200, first starch layer; 300, second starch layer; 400, surface layer; 401, protrusion; 402, depression. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example 1

[0024] like Figure 1-2 As shown, this embodiment provides an anti-adhesion paper, including a paper layer 100, a first starch layer 200, a second starch layer 300 and a surface layer 400, wherein at least one first starch layer 200 and a second starch layer 300 are provided;

[0025] The first starch layer 200 is laminated to the paper layer 100, wherein the outermost first starch layer 200 is laminated with a second starch layer 300;

[0026] The outermost second starch layer 300 is composited with a surface layer 400, wherein the surface layer 400 is made of polyvinyl alcohol, specifically, it is coated with polyvinyl alcohol. In this embodiment, the preferred coating amount is 15 g / m². 2 .

[0027] Specifically, in this embodiment, the first starch layer 200 is formed by starch coating, wherein the thickness is 10-15 μm, and in this embodiment, the preferred coating amount is 10 g / m. 2 The second starch layer 300 is formed by coating with starch dextrin. In this embodiment, the preferred coating amount is 6 g / m². 2 The thickness is 5-10 μm.

[0028] The thickness of the surface layer 400 is 15-25 μm, wherein the outer surface of the surface layer 400 has a rough texture. Preferably, the roughness Ra μm of the rough texture of the surface layer 400 is greater than 3.5, and in this embodiment, it is preferably greater than 4.2.

[0029] In this embodiment, the surface of the surface layer 400 is formed by adjacent protrusions 401 and recesses 402 to create a rough texture. This rough texture reduces the effective contact area between the paper layer and the PE film, effectively lowering the peel force requirement and thus avoiding the problem of tear residue. Preferably, in this embodiment, a dendritic texture embossing roller (linear pressure 50 N / cm, temperature 60°C) is used to form the rough texture. After drying and curing, the thickness of the surface layer 400 is 20-50 μm, preferably 35 μm.

[0030] The manufacturing materials of paper layer 100 include kraft paper or other substrate paper, selected according to different needs.

[0031] Specifically, the first starch layer 200 and the second starch layer 300 can effectively inhibit starch gelatinization at high temperatures, and the temperature tolerance is increased from 80℃ of traditional paraffin coating to 100℃, meeting the requirements of industrial heat sealing processes (such as contact scenarios at 150-220℃).

[0032] This invention utilizes a first starch layer, a second starch layer, and a surface layer to achieve a residue-free tear-off effect when in contact with PE film, avoiding issues such as food safety and appearance defects. The gradient structure (first starch layer + second starch layer) inhibits high-temperature gelatinization of starch, increasing the temperature tolerance from 80℃ (traditional paraffin coating) to 100℃, meeting the requirements of industrial heat-sealing processes (e.g., contact scenarios at 150-220℃). The bio-based materials (starch, starch concentrate, polyvinyl alcohol) eliminate the risk of silicone oil / paraffin migration, comply with food safety standards, and align with the trend of green packaging. The physical structure's anti-adhesion design avoids interference from chemical release agents in printing / lamination processes, allowing direct adaptation to existing coating and embossing production lines at a lower cost. Testing shows that the peel strength drops below 0.3 N / mm, with a fiber residue rate of 0%.

[0033] Example 2

[0034] This embodiment provides a paper bag made of an anti-sticking paper as described in Embodiment 1.

[0035] The paper of this invention, through the arrangement of a first starch layer, a second starch layer, and a surface layer, achieves a residue-free tear-off effect when in contact with PE film, avoiding issues such as food safety and appearance defects. The gradient structure (first starch layer + second starch layer) can inhibit high-temperature gelatinization of starch, increasing the temperature tolerance from 80℃ for traditional paraffin coatings to 100℃, meeting the requirements of industrial heat-sealing processes (such as contact scenarios at 150-220℃). The bio-based materials (starch, starch concentrate, polyvinyl alcohol) eliminate the risk of silicone oil / paraffin migration, comply with food safety standards, and meet the trend of green packaging. The physical structure's anti-adhesion design avoids interference from chemical release agents in printing / lamination processes, allowing direct adaptation to existing coating and embossing production lines at a lower cost.

[0036] Correspondingly, the paper bags made from them are better suited to food safety and appearance requirements.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A type of anti-sticking paper, characterized in that, It includes a paper layer (100), a first starch layer (200), a second starch layer (300) and a surface layer (400), wherein at least one of the first starch layer (200) and the second starch layer (300) is provided; The first starch layer (200) is laminated to the paper layer (100), wherein the outermost first starch layer (200) is laminated with the second starch layer (300). The outermost second starch layer (300) is composited with a surface layer (400), wherein, The surface layer (400) is made of polyvinyl alcohol.

2. The anti-adhesion paper according to claim 1, characterized in that, The first starch layer (200) is formed by starch coating, wherein the thickness is 10-15 μm.

3. The anti-adhesion paper according to claim 1 or 2, characterized in that, The second starch layer (300) is formed by coating with starch dextrin, wherein the thickness is 5-10 μm.

4. The anti-adhesion paper according to claim 3, characterized in that, The thickness of the surface layer (400) is 15-25 μm, wherein, The outer surface of the surface layer (400) has a rough texture.

5. The anti-adhesion paper according to claim 4, characterized in that, The roughness Ra of the rough texture of the surface layer (400) is greater than 3.

5.

6. The anti-adhesion paper according to claim 5, characterized in that, The surface of the surface layer (400) is formed by adjacent protrusions (401) and depressions (402) to create a rough texture.

7. The anti-adhesion paper according to claim 3, characterized in that, The paper layer (100) is made of kraft paper.

8. A paper bag, characterized in that, Made from an anti-adhesion paper according to any one of claims 1 to 7.

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