Pressure-sensitive adhesive paper

Abstract

The utility model provides pressure-sensitive adhesive paper, and relates to the technical field of material bonding. The pressure-sensitive adhesive paper comprises a release film, a pressure-sensitive adhesive layer and a protective film, the pressure-sensitive adhesive layer is adhered to the release film, one part of the protective film is adhered to the pressure-sensitive adhesive layer, the other part of the protective film is adhered to the release film, and the viscosity of the protective film is smaller than that of the pressure-sensitive adhesive layer. The protective film is partially adhered to the release film, so that adhesive force is formed between the protective film and the release film, the protective film can fix the pressure-sensitive adhesive layer, and the risk of displacement of the pressure-sensitive adhesive layer on the release film is reduced. When the pressure-sensitive adhesive paper is used, the protective film and the pressure-sensitive adhesive layer can be moved out from the release film, so that the release of the pressure-sensitive adhesive layer is realized. When the protective film and the pressure-sensitive adhesive layer are bonded on the material, the pressure-sensitive adhesive layer and the protective film are both bonded with the material, and the bonding force between the pressure-sensitive adhesive layer and the material and the bonding force between the protective film and the material are large, so that the risk that the material falls off in the carrying process is reduced.

Description

Technical Field

[0001] This application relates to the field of material bonding technology, and in particular to a pressure-sensitive adhesive paper. Background Technology

[0002] In pressure-sensitive adhesive paper, a release film is typically used to release the pressure-sensitive adhesive layer. When the area of ​​the pressure-sensitive adhesive layer is smaller than the area of ​​the release film, the bonding area between the pressure-sensitive adhesive layer and the release film is small, increasing the risk of displacement of the pressure-sensitive adhesive layer on the release film. Furthermore, after bonding the release film and the pressure-sensitive adhesive layer to the material, it can be transported by adsorbing the side of the release film opposite the pressure-sensitive adhesive layer. However, due to the small area of ​​the pressure-sensitive adhesive layer and insufficient adhesive strength, the material is at high risk of falling during handling. Utility Model Content

[0003] In view of this, this application provides a pressing adhesive paper to solve the problem that the pressure-sensitive adhesive layer has a high risk of displacement on the release film, and that the material has a high risk of falling off during material handling after the release film and pressure-sensitive adhesive layer are bonded to the material.

[0004] This application provides a pressure-sensitive adhesive paper, which includes a release film, a pressure-sensitive adhesive layer, and a protective film. The pressure-sensitive adhesive layer is bonded to the release film, a portion of the protective film is bonded to the pressure-sensitive adhesive layer, and another portion of the protective film is bonded to the release film. The adhesiveness of the protective film is less than that of the pressure-sensitive adhesive layer.

[0005] Preferably, the protective film includes a main body and an extension connected to each other, at least a portion of the main body is bonded to the pressure-sensitive adhesive layer, and the extension is bonded to the release film.

[0006] Preferably, the extension extends in a predetermined direction, and the dimension of the extension in the predetermined direction is larger than the dimension of the main body in the predetermined direction.

[0007] Preferably, the pressure-sensitive adhesive layer is bonded to the main body portion on the side near the extension portion in the predetermined direction.

[0008] Preferably, the area of ​​the protective film facing the release film is a first value, the area of ​​the pressure-sensitive adhesive layer facing the protective film is a second value, and the ratio of the second value to the first value is less than or equal to 30%.

[0009] Preferably, the adhesiveness of the protective film is less than or equal to 10% of the adhesiveness of the pressure-sensitive adhesive layer.

[0010] Preferably, the protective film includes a base layer and a protective adhesive layer, the protective adhesive layer covering the surface of the base layer facing the release film, a portion of the protective adhesive layer being bonded to the pressure-sensitive adhesive layer, and another portion of the protective adhesive layer being bonded to the release film.

[0011] Preferably, the pressure-sensitive adhesive paper includes multiple pressure-sensitive adhesive layers, which are arranged at intervals on the release film.

[0012] Preferably, the pressure-sensitive adhesive paper includes multiple protective films, each of which corresponds to one of the multiple pressure-sensitive adhesive layers. The protective films are bonded to their corresponding pressure-sensitive adhesive layers, and the multiple protective films are arranged at intervals.

[0013] Preferably, the release film includes two connecting surfaces that are opposite to each other in the thickness direction of the release film, the plurality of pressure-sensitive adhesive layers are bonded to the same connecting surface, and the release film is wound up.

[0014] The pressure-sensitive adhesive paper of this application includes a release film, a pressure-sensitive adhesive layer, and a protective film. The pressure-sensitive adhesive layer is bonded to the release film, a portion of the protective film is bonded to the pressure-sensitive adhesive layer, and another portion of the protective film is bonded to the release film. The adhesive strength of the protective film is less than that of the pressure-sensitive adhesive layer. By partially bonding the protective film to the release film, an adhesive force is established between the two, allowing the protective film to fix the pressure-sensitive adhesive layer and reducing the risk of displacement of the pressure-sensitive adhesive layer on the release film. When using the adhesive paper, the protective film and the pressure-sensitive adhesive layer can be removed from the release film, thus releasing the pressure-sensitive adhesive layer. When the protective film and the pressure-sensitive adhesive layer are bonded to the material, both the pressure-sensitive adhesive layer and the protective film adhere to the material, and the adhesive force between the pressure-sensitive adhesive layer and the protective film and the material is relatively large, thereby reducing the risk of the material falling off during handling. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of pressure-sensitive adhesive paper is shown;

[0017] Figure 2 This diagram shows the relative positions of the protective film and the pressure-sensitive adhesive layer.

[0018] Figure 3 A partial structural diagram of pressure-sensitive adhesive paper is shown.

[0019] Figure 4This diagram shows the relative positions of the protective film and the battery cell when the pressure-sensitive adhesive layer and the protective film are bonded to the battery cell.

[0020] Figure 5 An exploded view of the assembly structure of the pressure-sensitive adhesive layer, protective film, and battery cell is shown.

[0021] Icons: 1-Release film; 2-Pressure-sensitive adhesive layer; 3-Protective film; 31-Main body; 32-Extension; 4-Battery cell; S1-Connecting surface; L-Determined direction. Detailed Implementation

[0022] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0023] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0024] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0025] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0026] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0027] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0028] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0029] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0030] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0031] The following will combine Figures 1 to 5 In describing the pressure-sensitive adhesive paper of this application, it should be noted that, for the purpose of clearly showing the relative positions of the release film 1, the pressure-sensitive adhesive layer 2, and the protective film 3, Figure 3The release film 1 was made transparent.

[0032] like Figures 1 to 5 As shown, the pressure-sensitive adhesive paper includes a release film 1, a pressure-sensitive adhesive layer 2, and a protective film 3. The pressure-sensitive adhesive layer 2 is bonded to the release film 1. Part of the protective film 3 is bonded to the pressure-sensitive adhesive layer 2, and another part of the protective film 3 is bonded to the release film 1. The adhesive strength of the protective film 3 is less than that of the pressure-sensitive adhesive layer 2. The bonding between the protective film 3 and the release film 1 creates an adhesive force, which allows the protective film 3 to fix the pressure-sensitive adhesive layer 2, thus reducing the risk of the pressure-sensitive adhesive layer 2 shifting on the release film 1. When using the adhesive paper, the protective film 3 and the pressure-sensitive adhesive layer 2 can be removed from the release film 1, thereby releasing the pressure-sensitive adhesive layer 2. When the protective film 3 and the pressure-sensitive adhesive layer 2 are bonded to the material, both the pressure-sensitive adhesive layer 2 and the protective film 3 adhere to the material. The adhesive force between the pressure-sensitive adhesive layer 2 and the protective film 3 and the material is relatively large, thus reducing the risk of the material falling off during handling.

[0033] Furthermore, since the adhesiveness of the protective film 3 is less than that of the pressure-sensitive adhesive layer 2, the adhesive force between the protective film 3 and the release film 1 is less than that between the pressure-sensitive adhesive layer 2 and the release film 1, making it easier to remove the protective film 3 and the pressure-sensitive adhesive layer 2 from the release film 1.

[0034] In the embodiments of this application, such as Figure 2 and Figure 3 As shown, the protective film 3 includes a main body 31 and an extension 32 connected to each other. At least a portion of the main body 31 is bonded to the pressure-sensitive adhesive layer 2, and the entire extension 32 is bonded to the release film 1. Thus, there is only an adhesive force between the main body 31 and the pressure-sensitive adhesive layer 2, and no adhesive force between the extension 32 and the pressure-sensitive adhesive layer 2. The extension 32 only has an adhesive force with the release film 1, which facilitates the removal of the protective film 3 and the pressure-sensitive adhesive layer 2 from the release film 1 by applying force to the extension 32.

[0035] Optionally, the main body 31 may be partially bonded to the pressure-sensitive adhesive layer 2. In this case, the portion of the main body 31 other than that bonded to the pressure-sensitive adhesive layer 2 is bonded to the release film 1. In this case, the main body 31 and the entire extension 32 in the protective film 3 are bonded to the release film 1. Alternatively, the main body 31 may be entirely bonded to the pressure-sensitive adhesive layer 2. In this case, only the extension 32 in the protective film 3 is bonded to the release film 1.

[0036] Preferably, the extension 32 extends along a predetermined direction L, that is, the extension 32 extends from one side of the main body 31 along the predetermined direction L in a direction away from the main body 31, and the dimension of the extension 32 in the predetermined direction L is larger than the dimension of the main body 31 in the predetermined direction L. In this way, the area of ​​the extension 32 is larger, which makes it easier to remove the protective film 3 and the pressure-sensitive adhesive layer 2 from the release film 1 by applying force to the extension 32.

[0037] Preferably, the pressure-sensitive adhesive layer 2 is bonded to the main body portion 31 on the side near the extension portion 32 in the predetermined direction L. In this way, the portions of the protective film 3 located on both sides of the pressure-sensitive adhesive layer 2 in the predetermined direction L are bonded to the release film 1, which can improve the uniformity of the force applied by the protective film 3 to the pressure-sensitive adhesive layer 2, thereby further reducing the risk of displacement of the pressure-sensitive adhesive layer 2 on the release film 1.

[0038] Optionally, the area of ​​the protective film 3 facing the release film 1 is a first value, that is, the sum of the area of ​​the main body 31 facing the release film 1 and the area of ​​the extension 32 facing the release film 1 is a first value, and the area of ​​the pressure-sensitive adhesive layer 2 facing the protective film 3 is a second value. The ratio of the second value to the first value is less than or equal to 30%. This can prevent the pressure-sensitive adhesive layer 2 from occupying too large an area on the protective film 3, thereby avoiding excessive adhesion between the protective film 3 and the pressure-sensitive adhesive layer 2, which would make it difficult to separate the protective film 3 from the pressure-sensitive adhesive layer 2.

[0039] Preferably, the ratio of the second value to the first value is 4.8%.

[0040] like Figure 2 As shown, the main body 31 is circular, and the extension 32 can be a rectangular structure extending from the outer side of the circular main body 31. The length direction of the extension 32 is the predetermined direction L. The main body 31 can be divided into two parts by a plane of symmetry, which is perpendicular to the predetermined direction L. The two parts of the main body 31 located on both sides of the plane of symmetry are symmetrical about the plane of symmetry. The pressure-sensitive adhesive layer 2 can extend along the circumferential direction of the main body 31, and the pressure-sensitive adhesive layer 2 is located on the side of the plane of symmetry closer to the extension 32. At this time, the pressure-sensitive adhesive layer 2 can be used to bond the electrode and the cell 4 of the button battery.

[0041] It should be noted that the shapes of the main body 31 and the extension 32 are not limited to those of other parts. Figures 1 to 5 The shapes shown in the figure can be selected according to requirements. For example, the main body 31 can be any shape such as a rectangle, triangle, or rhombus, and the extension 32 can also be any shape such as a triangle or rhombus. In this case, the extension 32 has the maximum size in the predetermined direction L.

[0042] Furthermore, the adhesiveness of the protective film 3 is less than or equal to 10% of the adhesiveness of the pressure-sensitive adhesive layer 2. This ensures the stability of the protective film 3 in fixing the pressure-sensitive adhesive layer 2, while also ensuring that the pressure-sensitive adhesive layer 2 and the protective film 3 can be smoothly separated.

[0043] Optionally, the protective film 3 includes a base layer and a protective adhesive layer. The protective adhesive layer covers the surface of the base layer facing the release film 1. Part of the protective adhesive layer is bonded to the pressure-sensitive adhesive layer 2, and another part of the protective adhesive layer is bonded to the release film 1, so that the protective film 3 can fix the pressure-sensitive adhesive layer 2.

[0044] Preferably, the protective film 3 can be a weakly tacky protective film. For example, the protective film 3 can be a PET protective film (PET, Polyethylene terephthalate) with a tackiness of less than or equal to 20g / 25mm. In this case, the base layer is a PET film and the protective adhesive layer is the adhesive layer on the PET film.

[0045] In the embodiments of this application, such as Figure 1 and Figure 3 As shown, the pressure-sensitive adhesive paper may include multiple pressure-sensitive adhesive layers 2, which are spaced apart on the release film 1. Thus, one release film 1 can accommodate multiple pressure-sensitive adhesive layers 2, thereby reducing the cost of the pressure-sensitive adhesive paper. Preferably, the multiple pressure-sensitive adhesive layers 2 are arranged at equal intervals along the length of the release film 1.

[0046] Optionally, a protective film 3 may be provided for one pressure-sensitive adhesive layer 2, or several pressure-sensitive adhesive layers 2 may be provided with one protective film 3.

[0047] Preferably, the pressure-sensitive adhesive paper includes multiple protective films 3, the number of which is the same as the number of pressure-sensitive adhesive layers 2. Each protective film 3 corresponds one-to-one with a pressure-sensitive adhesive layer 2, and the protective film 3 is bonded to its corresponding pressure-sensitive adhesive layer 2. By applying force to one protective film 3, both the protective film 3 and its corresponding pressure-sensitive adhesive layer 2 can be removed from the release film 1. The multiple protective films 3 are arranged at intervals, meaning that there is no overlap between the protective films 3. This avoids affecting other protective films 3 when force is applied to one protective film 3.

[0048] Furthermore, the release film 1 includes two connecting surfaces S1 that are opposite to each other in the thickness direction of the release film 1, and multiple pressure-sensitive adhesive layers 2 are bonded to the same connecting surface S1. The release film 1 is wound up. Thus, for any pressure-sensitive adhesive layer 2 and the corresponding protective film 3, the whole is located between the two release films 1, so that the release film 1 can cover the protective film 3 to protect it.

[0049] In the pressure-sensitive adhesive paper of this application, the protective film 3 and the release film 1 have adhesive force, which can reduce the risk of displacement of the pressure-sensitive adhesive layer 2 on the release film 1. When using the pressure-sensitive adhesive paper of this application to bond the electrode sheet and the battery cell 4, force can be applied to the protective film 3 to remove the protective film 3 and the pressure-sensitive adhesive layer 2 from the release film 1, and then the protective film 3 and the pressure-sensitive adhesive layer 2 can be bonded to the battery cell 4. At this time, the relative positions between the protective film 3, the pressure-sensitive adhesive layer 2 and the battery cell 4 are as follows: Figure 4 and Figure 5 As shown. The protective film 3 can then be adsorbed onto the surface of the pressure-sensitive adhesive layer 2 using the suction cup of the handling device, allowing for the handling of the battery cell 4, the protective film 3, and the pressure-sensitive adhesive layer 2 adhered to it. Because the protective film 3 has adhesive force with the battery cell 4, the risk of the battery cell 4 falling off during handling is reduced. After handling the battery cell 4, the protective film 3 can be removed from the battery cell 4 and the pressure-sensitive adhesive layer 2, allowing the battery cell 4 to bond to the electrode through the pressure-sensitive adhesive layer 2.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pressure sensitive adhesive paper, characterized by, The pressure-sensitive adhesive sheet includes a release film, a pressure-sensitive adhesive layer bonded to the release film, and a protective film, a portion of which is bonded to the pressure-sensitive adhesive layer and another portion of which is bonded to the release film, the protective film having a smaller adhesion than the pressure-sensitive adhesive layer.

2. The pressure sensitive adhesive paper according to claim 1, characterized in that, The protective film includes a main body portion and an extension portion connected to each other, at least a portion of the main body portion being bonded to the pressure-sensitive adhesive layer, and the extension portion being bonded to the release film.

3. The pressure sensitive adhesive paper according to claim 2, wherein The extension portion extends in a predetermined direction, the extension portion having a size in the predetermined direction that is greater than a size of the main body portion in the predetermined direction.

4. The pressure sensitive adhesive paper according to claim 3, characterized in that, The pressure-sensitive adhesive layer is bonded to a side of the main body portion that is proximate to the extension portion in the predetermined direction.

5. The pressure sensitive adhesive paper according to any one of claims 1 to 4, characterized in that, An area of a surface of the protective film that faces the release film is a first value, an area of a surface of the pressure-sensitive adhesive layer that faces the protective film is a second value, and a ratio of the second value to the first value is less than or equal to 30%.

6. The pressure sensitive adhesive paper according to any one of claims 1 to 4, wherein, The protective film has an adhesion that is less than or equal to 10% of an adhesion of the pressure-sensitive adhesive layer.

7. The pressure sensitive adhesive paper according to claim 6, wherein The protective film includes a base layer and a protective adhesive layer that covers a surface of the base layer that faces the release film, a portion of the protective adhesive layer being bonded to the pressure-sensitive adhesive layer and another portion of the protective adhesive layer being bonded to the release film.

8. The pressure sensitive adhesive paper according to any one of claims 1 to 4, wherein, The pressure-sensitive adhesive sheet includes a plurality of pressure-sensitive adhesive layers that are arranged at intervals on the release film.

9. The pressure sensitive adhesive paper according to claim 8, wherein The pressure-sensitive adhesive sheet includes a plurality of protective films that correspond to the plurality of pressure-sensitive adhesive layers, the protective films being bonded to the corresponding pressure-sensitive adhesive layers, and the plurality of protective films being arranged at intervals.

10. The pressure sensitive adhesive paper according to claim 9, wherein The release film includes two connection surfaces that face away from each other in a thickness direction of the release film, the plurality of pressure-sensitive adhesive layers being bonded to the same connection surface, and the release film being wound.

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