Release paper capable of being used for heat sealing

Abstract

The utility model discloses release paper capable of being used for heat sealing, which comprises a base paper layer, a heat sealing layer and a release layer, one side of the heat sealing layer is covered on the base paper layer, the other side of the heat sealing layer is provided with the release layer, and the release paper capable of being used for heat sealing achieves balance of flexibility, bulkness and strength through a multi-layer composite structure of the base paper layer. Due to the reasonable combination and arrangement mode of all layers of fiber materials, the mechanical performance of the release paper is improved, the service life of the release paper is prolonged, the performance in the heat sealing and release process is optimized, the requirements of various application scenes are met, meanwhile, the release layer of the release paper adopts a silicon-based coating and is distributed through a fixed-point coating technology, and the production cost is reduced. Only the part, needing the release function, of the heat sealing layer is covered. The precise coating mode effectively reduces the waste of the release material, reduces the production cost, avoids the influence of unnecessary coatings on the performance of other regions of the product, and improves the environmental protection property and the economical efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of release paper, concretely is a kind of release paper for heat sealing. BACKGROUND

[0002] With the increasing attention of people to environmental protection and sustainable development, the plastic components in traditional packaging materials are gradually restricted. In the packaging of sanitary products, traditional release paper and release film usually contain non-degradable plastics or rely on a large number of chemical adhesives, which not only cause burden to the environment, but also increase production cost. In order to solve this problem, an environmentally friendly material that can realize heat sealing function and has excellent release performance is urgently needed.

[0003] The release paper on the market at present adopts single structure design, and its flexibility, bulkiness and heat resistance cannot be considered, which is easy to break, heat seal not firm or release not good in the production process. In addition, the coating method of release layer is mostly whole covering method, which can realize release function, but will cause material waste and increase production cost.

[0004] Through retrieval, a release paper manufacturing process and the release paper produced by the process are disclosed in Chinese patent document

Application No. 202110069607.5, Publication No. CN112458796B

[0005] In view of the problems in the prior art, the purpose of the utility model is to provide a release paper for heat sealing.

[0006] A release paper for heat sealing, characterized in that it comprises a base paper layer, a heat sealing layer and a release layer, one side of the heat sealing layer covers the base paper layer, and the other side of the heat sealing layer is provided with a release layer.

[0007] Preferably, the base paper layer comprises a long-fiber conifer pulp layer, a short-fiber broadleaf pulp layer and a grass fiber layer, and the arrangement order of the base paper layer from top to bottom is long-fiber conifer pulp layer, grass fiber layer, short-fiber broadleaf pulp layer, wherein the side of the long-fiber conifer pulp layer is covered with the heat sealing layer.

[0008] By the above technical solution, the long-fiber coniferous pulp has high tensile strength and flexibility due to its long fibers, which can enhance the mechanical stability of the base paper layer as a whole. The intermediate grass fibers have high bulkiness and elasticity, which can provide necessary support while ensuring the overall lightweight of the base paper layer. The short-fiber broadleaf pulp has short and fine fibers, which can improve the surface uniformity and smoothness of the paper, providing a stable foundation for subsequent coating of the release layer.

[0009] Preferably, the arrangement of fibers in the long-fiber coniferous pulp layer and the short-fiber broadleaf pulp layer is different in the horizontal direction.

[0010] By the above technical solution, the superposition design of different fiber arrangement optimizes the strength of the base paper layer in multiple directions. The regular arrangement of long-fiber coniferous pulp layer improves the tensile performance of the paper in the horizontal direction, while the random arrangement of short-fiber broadleaf pulp layer increases the compressive capacity of the paper in the vertical direction, thereby improving the overall strength of the base paper layer.

[0011] Preferably, the heat-sealing layer is a continuous and uniform film structure.

[0012] By the above technical solution, the continuous and uniform film structure can provide consistent heat-sealing performance. The close combination of the heat-sealing layer covering the surface of the base paper layer can improve the overall stability of the composite structure. The continuous film structure eliminates the risk of delamination caused by interlayer gaps, ensuring a firm combination between the heat-sealing layer and the base paper layer.

[0013] Preferably, the release layer is coated with a silicon-based coating layer, which is formed into a specific pattern or regional distribution through point coating technology, covering only the parts of the heat-sealing layer that need to achieve the release function.

[0014] By the above technical solution, material waste caused by full coverage in traditional coating methods is avoided. This precise coating method can effectively control the thickness and distribution of the coating, improve coating efficiency, and reduce coating costs in the production process.

[0015] Preferably, a peelable connection is formed between the release layer and the heat-sealing layer.

[0016] By the above technical solution, the design of peelable connection ensures that the release layer can be easily peeled off from the surface of the heat-sealing layer during use without the need for additional external force or chemical auxiliaries, thereby improving the convenience of use and protecting the integrity of the heat-sealing layer.

[0017] Preferably, the surface of the base paper layer is provided with a micro-embossed structure.

[0018] Through the technical scheme, the embossed structure can relieve local tension concentration by changing stress distribution of the fiber surface, improve the tear resistance of the base paper layer, and make the release paper more durable in the heat sealing and peeling process.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. The release paper for heat sealing realizes the balance of flexibility, bulkiness and strength through the multi-layer composite structure of the base paper layer, and the reasonable combination and arrangement of the fiber materials of each layer, which not only improves the mechanical properties and service life of the release paper, but also optimizes the performance in the heat sealing and release process, and meets the requirements of various application scenarios.

[0021] 2. The release layer of the release paper for heat sealing adopts a silicon-based coating and is distributed through a fixed-point coating technology, and only covers the parts of the heat sealing layer that need release function. This precise coating method effectively reduces the waste of release material, reduces the production cost, avoids unnecessary coating on other areas of the product, improves the environmental protection and economy. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is the three-dimensional schematic view of the utility model

[0023] Fig. 2 is the A place local amplification schematic view of the utility model

[0024] In the drawing: 101, base paper layer; 201, long fiber softwood pulp layer; 202, short fiber hardwood pulp layer; 203, grass fiber layer; 102, heat sealing layer; 103, release layer. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] Please refer to Figs. 1-2 The utility model provides a technical scheme:

[0027] A release paper for heat sealing, characterized in that it comprises a base paper layer 101, a heat sealing layer 102 and a release layer 103, one side of the heat sealing layer 102 is covered on the base paper layer 101, and the other side of the heat sealing layer 102 is provided with the release layer 103.

[0028] Specifically, the base paper layer 101 includes a long-fiber coniferous pulp layer 201, a short-fiber broadleaf pulp layer 202, and a grass fiber layer 203. The arrangement order of the base paper layer 101 from top to bottom is as follows: the long-fiber coniferous pulp layer 201, the grass fiber layer 203, and the short-fiber broadleaf pulp layer 202. The side of the long-fiber coniferous pulp layer 201 is covered with a heat-sealing layer 102. The long-fiber coniferous pulp layer 201 can effectively enhance the tensile strength and flexibility of the base paper layer 101. At the same time, the arrangement of long fibers can make the paper have better stability and uniformity, ensuring good adhesion of the heat-sealing layer 102. The grass fiber layer 203 has strong elasticity and toughness, and can also improve the contact surface between the heat-sealing layer 102 and the base paper layer 101. By adjusting the thickness of the grass fiber layer 203, the overall thickness of the base paper layer 101 can be adjusted. The short-fiber broadleaf pulp layer 202 is relatively dense, which can avoid deformation caused by high temperature during heat sealing.

[0029] Specifically, the arrangement of fibers in the long-fiber coniferous pulp layer 201 and the short-fiber broadleaf pulp layer 202 is different in the horizontal direction. The multi-directional arrangement of fibers disperses the concentrated effect of external force on a single direction, especially during the heat sealing and peeling process, which can effectively reduce the risk of tearing while maintaining the flexibility and shape stability of the paper.

[0030] Specifically, the heat-sealing layer 102 is a continuous and uniform film structure. The continuous and uniform film structure can provide consistent heat-sealing performance. The heat-sealing layer 102 covers the surface of the base paper layer 101 and tightly combines with the base paper layer 101, which can improve the overall stability of the composite structure. The continuous film structure eliminates the risk of delamination caused by interlayer gaps, ensuring a firm combination between the heat-sealing layer 102 and the base paper layer 101. Since the heat-sealing layer 102 is a uniform and continuous film structure, complex adjustments or corrections are not needed during production, reducing production errors and improving the operating efficiency of the production line. This design not only reduces production costs, but also improves the reliability and consistency of the production process.

[0031] Specifically, the release layer 103 is coated with a silicon-based coating. The silicon-based coating forms a specific pattern or regional distribution through a fixed-point coating technology, covering only the parts of the heat-sealing layer 102 that need to achieve the release function, avoiding material waste that may be caused by full coverage in traditional coating methods. This precise coating method can effectively control the thickness and distribution of the coating, improve coating efficiency, and reduce coating costs during production. At the same time, the flexibility of the fixed-point coating technology enables the release paper to adapt to various product demands and production processes, allowing for customized production according to different heat-sealing requirements, release effects, and packaging types.

[0032] Specifically, the release layer 103 and the heat sealing layer 102 form a peelable connection, and since the release layer 103 and the heat sealing layer 102 can be stably peeled, the release paper can be widely used in various fields requiring peelable packaging, such as sanitary products, food packaging, and industrial protective materials, thereby expanding the application scenarios of the product.

[0033] Specifically, the surface of the base paper layer 101 is provided with a micro-embossed structure, and the design of the peelable connection ensures that the release layer 103 can be easily peeled from the surface of the heat sealing layer 102 during use without the need for additional external force or chemical auxiliary agents, thereby improving the convenience of use and protecting the integrity of the heat sealing layer 102. The micro-embossed structure gives the surface of the release paper a certain texture effect, not only enhancing the texture of the product, but also improving the overall aesthetics and product level of the release paper.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0036] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A release paper useful for heat sealing, characterized in that, The base paper layer (101), the heat-seal layer (102) and the release layer (103) are included, one side of the heat-seal layer (102) is covered on the base paper layer (101), and the other side of the heat-seal layer (102) is provided with the release layer (103).

2. A release paper useful for heat sealing according to claim 1, characterized in that: The base paper layer (101) includes a long-fiber coniferous pulp layer (201), a short-fiber broadleaf pulp layer (202) and a grass fiber layer (203), and the arrangement order of the base paper layer (101) from top to bottom is: the long-fiber coniferous pulp layer (201), the grass fiber layer (203), and the short-fiber broadleaf pulp layer (202), wherein the side of the long-fiber coniferous pulp layer (201) is covered with the heat-seal layer (102).

3. A release paper useful for heat sealing according to claim 2, wherein: The arrangement modes of the fibers of the long-fiber coniferous pulp layer (201) and the short-fiber broadleaf pulp layer (202) are different in the horizontal direction.

4. The release paper useful for heat sealing according to claim 1, wherein: The heat-seal layer (102) is a continuous and uniform film structure.

5. The release paper useful for heat sealing according to claim 1, wherein, The release layer (103) is coated with a silicon-based coating, which is formed into a specific pattern or regionally distributed by a fixed-point coating technology, and only covers the part of the heat-seal layer (102) that needs to realize the release function.

6. The release paper useful for heat sealing according to claim 1, wherein, A peelable connection is formed between the release layer (103) and the heat-seal layer (102).

7. The release paper useful for heat sealing according to claim 1, wherein, The surface of the base paper layer (101) is provided with a micro-embossed structure.

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