A vertically striped breathable release film

Abstract

This utility model belongs to the field of release film technology, and particularly relates to a vertically textured breathable release film, comprising: a vertically textured film layer, the upper surface of which is provided with a plurality of grooves extending along the length direction of the release film, the plurality of grooves being arranged parallel to each other, and the bottom of each groove having a plurality of breathable holes penetrating the vertically textured film layer in a vertical direction, the plurality of breathable holes being arranged along the length direction of the groove; a breathable fiber layer, disposed on the bottom surface of the vertically textured film layer, the breathable fiber layer having a porous structure, the top end of the breathable holes being directly connected to the outside, and the bottom end of the breathable holes being connected to the outside through the porous structure; and a substrate layer, disposed on the bottom surface of the breathable fiber layer. This utility model can further improve the air venting smoothness of the release film, allowing air bubbles between the product and the release film to be quickly expelled even when the product adhesion is high.

Description

Technical Field

[0001] This utility model belongs to the field of release film technology, and particularly relates to a vertically textured breathable release film. Background Technology

[0002] Release film is a thin film material with a release property. It is mainly used to prevent products from sticking to molds, substrates or other objects during the production process, so as to achieve smooth demolding and processing of products. The smaller the release force of the release film, the easier it is to remove the product from the release film. Conversely, the larger the release force of the release film, the more difficult it is to remove the product.

[0003] Traditional release films, due to their poor air permeability, easily generate numerous tiny air bubbles between the release film and the object when covering a large area. These bubbles weaken the release effect of the release film to some extent. To remove these bubbles, tools such as scrapers are typically used to squeeze them out of the gap between the release film and the object. However, during this process, insufficient force will not completely remove the bubbles; while excessive force may tear the release film, causing it to rupture. Therefore, release films need to be structurally designed with good air permeability to allow the gas in the tiny air bubbles between the release film and the object surface to escape smoothly.

[0004] Chinese utility model patent CN216942097U discloses a release film with easy-to-vent textures, comprising a first release film layer, a second release film layer, and a third release film layer; the upper and lower sides of the second release film layer are respectively bonded to the lower side of the first release film layer and the upper side of the third release film layer; both the upper and lower sides of the second release film layer are provided with first wavy concave-convex portions, and both the lower side of the first release film layer and the upper side of the third release film layer are provided with second wavy concave-convex portions, the protrusions and grooves of the first wavy concave-convex portions respectively fitting and engaging with the grooves and protrusions of the second wavy concave-convex portions; the upper side of the first release film layer is provided with multiple vent textures, so that when the release film is attached to the product, air bubbles between the release film and the product can be vented to the outside of the release film and the product through the multiple vent textures, which can improve the product adhesion. While the technical solution in this patent can solve the problem of air bubbles easily generated between the release film and the product to a certain extent, it can also easily block the grooves when the product has a strong adhesion, thus causing poor air venting. Utility Model Content

[0005] The purpose of this invention is to provide a vertically textured, breathable release film, which aims to solve the technical problem that release films in the prior art cannot smoothly expel air when the product adhesion is large.

[0006] To achieve the above objectives, this utility model provides a vertically textured breathable release film, comprising: a vertically textured film layer, the upper surface of which is provided with a plurality of grooves extending along the length direction of the release film, the plurality of grooves being arranged parallel to each other, and the bottom of each groove having a plurality of breathable holes penetrating the vertically textured film layer in a vertical direction, the plurality of breathable holes being arranged along the length direction of the groove; a breathable fiber layer disposed on the bottom surface of the vertically textured film layer, the breathable fiber layer having a porous structure, the top end of the breathable holes being directly connected to the outside, and the bottom end of the breathable holes being connected to the outside through the porous structure; and a substrate layer disposed on the bottom surface of the breathable fiber layer.

[0007] Optionally, a polylactic acid reinforcing layer is further provided between the breathable fiber layer and the substrate layer.

[0008] Optionally, the breathable fiber layer and the substrate layer are bonded together with an antistatic adhesive.

[0009] Optionally, it also includes sealing edges disposed on both sides in the width direction of the release film.

[0010] Optionally, the substrate layer is made of paper, plastic film, or nonwoven fabric.

[0011] Optionally, the thickness of the substrate layer is between 100 micrometers or more and 200 micrometers or less.

[0012] Optionally, the breathable fiber layer is made of nano-bamboo powder cellulose.

[0013] Optionally, the porosity of the pore structure is not less than 30%.

[0014] Optionally, the textured film layer is made of polycarbonate, polypropylene, or polyethylene.

[0015] Optionally, the diameter of the vent is greater than or equal to 10 micrometers to less than or equal to 50 micrometers, and the spacing between adjacent vents in the same groove is greater than or equal to 0.5 millimeters to less than or equal to 5 millimeters.

[0016] Compared with the prior art, the above-mentioned technical solutions of one or more of the vertically textured breathable release film provided by this utility model embodiment have at least one of the following technical effects: When a product is attached to the vertically textured breathable release film of this utility model, air bubbles will be generated between the product and the vertically textured film layer. By squeezing or using a scraper, some of the gas in the air bubbles can be discharged from the grooves on the vertically textured film layer to the outside of the release film and the product. If the product adhesion force is too strong and blocks the venting channel of the groove, the gas in the air bubbles can also enter the breathable fiber layer with a porous structure through the venting holes located in the groove, and then be discharged to the outside of the release film through the breathable fiber layer. This utility model can further improve the venting smoothness of the release film, and even when the product adhesion force is large, the air bubbles between the product and the release film can be discharged quickly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the vertically ribbed, breathable release membrane of this utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0020] The following are the labeling elements in the figure:

[0021] Vertical stripe membrane layer 100, groove 110, air pore 120;

[0022] 200 breathable fiber layer;

[0023] Polylactic acid reinforced layer 300;

[0024] Substrate layer 400;

[0025] Edge sealing 500. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below, examples of which 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 intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0030] like Figure 1 and Figure 2 As shown, this utility model discloses a vertically textured breathable release film, including a vertically textured film layer 100, a breathable fiber layer 200, and a substrate layer 400.

[0031] The vertically textured film layer 100 has multiple grooves 110 extending along the length of the release film on its upper surface. The grooves 110 are arranged in parallel to each other. Each groove 110 has several vent holes 120 penetrating the vertically textured film layer in the vertical direction at its bottom. The vent holes 120 are arranged along the length of the groove 110. The breathable fiber layer 200 is disposed on the bottom surface of the vertically textured film layer. The breathable fiber layer has a porous structure. The top of the vent holes 120 is directly connected to the outside. The bottom of the vent holes 120 is connected to the outside through the porous structure. The substrate layer is disposed on the bottom surface of the breathable fiber layer.

[0032] It is understandable that when a product is attached to the vertically ribbed breathable release film of this invention, air bubbles will be generated between the product and the vertically ribbed film layer 100. By squeezing or using a scraper, some of the gas in the bubbles can be discharged from the release film and the product through the grooves 110 on the vertically ribbed film layer 100. If the product adhesion is too strong and blocks the venting channel of the grooves 110, the gas in the bubbles can also enter the porous breathable fiber layer 200 through the venting holes 120 located in the grooves 110, and then be discharged from the release film through the breathable fiber layer 200. This invention can further improve the venting smoothness of the release film, so that even when the product adhesion is large, the air bubbles between the product and the release film can be discharged quickly.

[0033] It should be noted that, in Figure 2 In the cross-sectional structure shown, the dimensions of the release film along its length do not represent its actual size, but are merely a simplified representation of a portion of its length; therefore, the ends along the length are cut off with dashed lines. Furthermore, Figure 2 The dashed arrows in the diagram are not part of the release membrane structure, but are only used to illustrate the approximate trajectory of gas inside the bubble entering the breathable fiber layer 200 through the vent 120 and exiting through the breathable fiber layer 200 to the outside of the release membrane. The vertically textured membrane layer 100 is typically manufactured using an extrusion molding process, which involves processing the polymer material into a vertically textured membrane layer with grooves.

[0034] Furthermore, the vents 120 on the vertically textured membrane layer 100 can be obtained by drilling through the vertically textured membrane layer 100 using micron-level laser drilling technology. The vertically textured membrane layer 100 can be integrally formed with other layers after the vents 120 are processed. In addition, the vertically textured membrane layer 100 and the breathable fiber layer 200 can be bonded to each other by ultrasonic pressing or hot pressing.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment of this invention, a polylactic acid (PLA) reinforcing layer 300 is further provided between the breathable fiber layer 200 and the substrate layer 400. The thickness of the PLA reinforcing layer 300 can be between 50 micrometers or more and 100 micrometers or less. Specifically, during the production process, PLA can be melted at high temperature and coated onto the lower surface of the breathable fiber layer 200. Then, the substrate layer 400 is bonded onto the melted PLA. After drying, the PLA reinforcing layer 300 is formed between the breathable fiber layer 200 and the substrate layer 400. The PLA reinforcing layer 300 can significantly improve the tensile strength, flexural strength, and modulus of the material, and can improve the toughness and impact resistance of the release film, making the release film less prone to breakage when subjected to external impact.

[0036] In one embodiment of this invention, the breathable fiber layer 200 and the substrate layer 400 can be bonded together using an antistatic adhesive. In embodiments where a polylactic acid reinforcing layer 300 is provided, the antistatic adhesive can be applied to both the polylactic acid reinforcing layer 300 and the substrate layer 400; in embodiments where a polylactic acid reinforcing layer 300 is not provided, the breathable fiber layer 200 can be directly bonded to the substrate layer 400 using the antistatic adhesive. The antistatic adhesive can reduce and prevent the electromagnetic field effect of electrostatic discharge and has strong adhesion. The antistatic adhesive formulation, by weight, specifically consists of the following: 4.7-8 parts cellulose, 2.3-4 parts gluten powder, 41-64 parts tung oil, and 24-51.3 parts conductive filler; the conductive filler is one or a mixture of conductive graphite, conductive carbon black, conductive mica, and metal oxide conductive agents; the cellulose is one or a mixture of hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.

[0037] like Figure 1 As shown, in one embodiment of this utility model, it further includes sealing edges 500 disposed on both sides in the width direction of the release film. The sealing edges 500 can prevent the edges of each layer of the release film from separating and peeling after long-term use, and the sealing edges 500 can fix the structure of the release film, so that each layer is tightly adhered.

[0038] In one embodiment of this invention, the substrate layer 400 is made of paper, plastic film, or nonwoven fabric. For example, the substrate layer 400 can be made of PET polyester film. PET material has good mechanical properties, chemical stability, and transparency, which allows the release film to maintain stable performance and a long service life during use.

[0039] Furthermore, in one embodiment of the present invention, the thickness of the substrate layer 400 may be selected to be between 100 micrometers or more and 200 micrometers or less.

[0040] In one embodiment of this utility model, the breathable fiber layer 200 is made of nano-bamboo cellulose powder. Specifically, when making the breathable fiber layer 200, bamboo fiber is crushed into nano-bamboo fiber particles, and then the nano-bamboo fiber particles are used to make the breathable fiber layer 200 using a micron-level injection molding process.

[0041] Furthermore, in one embodiment of this utility model, the porosity of the pore structure is not less than 30%, ensuring both the structural strength and breathability of the breathable fiber layer 200. Porosity refers to the ratio of pore volume to the total volume of a material, usually expressed as a percentage (%). It is an important parameter for measuring the internal pore structure of a material, reflecting the degree of openness and density of the pores within the material.

[0042] Furthermore, in one embodiment of the present invention, the vertically textured film layer 100 may be made of polycarbonate, polypropylene or polyethylene.

[0043] Furthermore, in one embodiment of the present invention, the diameter of the vent 120 can be set to be greater than or equal to 10 micrometers to less than or equal to 50 micrometers, and the spacing between adjacent vents 120 in the same groove 110 can be set to be greater than or equal to 0.5 millimeters to less than or equal to 5 millimeters.

[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, the architectural form of this utility model can be flexibly varied without departing from its concept, and a series of products can be derived. Any simple deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A vertically ribbed, breathable release film, characterized in that, include: The vertically textured film layer has multiple grooves extending along the length of the release film on its upper surface. The multiple grooves are arranged in parallel with each other. Each groove has several vent holes that penetrate the vertically textured film layer in a vertical direction at its bottom. The vent holes are arranged along the length of the groove. A breathable fiber layer is disposed on the bottom surface of the vertically textured membrane layer. The breathable fiber layer has a porous structure. The top of the breathable pores is directly connected to the outside, and the bottom of the breathable pores is connected to the outside through the porous structure. A substrate layer is disposed on the bottom surface of the breathable fiber layer.

2. The vertically ribbed, breathable release film according to claim 1, characterized in that, A polylactic acid reinforcing layer is also provided between the breathable fiber layer and the substrate layer.

3. The vertically ribbed, breathable release film according to claim 2, characterized in that, The breathable fiber layer and the substrate layer are bonded together with antistatic adhesive.

4. The vertically ribbed, breathable release film according to claim 1, characterized in that, It also includes sealing edges on both sides in the width direction of the release film.

5. The vertically ribbed, breathable release film according to claim 1, characterized in that, The substrate layer is made of paper, plastic film or non-woven fabric.

6. The vertically ribbed, breathable release film according to claim 5, characterized in that, The thickness of the substrate layer is between 100 micrometers and 200 micrometers.

7. The vertically ribbed, breathable release film according to claim 1, characterized in that, The breathable fiber layer is made of nano bamboo powder cellulose.

8. The vertically ribbed, breathable release film according to claim 7, characterized in that, The porosity of the pore structure is not less than 30%.

9. The vertically ribbed, breathable release film according to claim 1, characterized in that, The vertically textured membrane layer is made of polycarbonate, polypropylene, or polyethylene.

10. The vertically ribbed, breathable release film according to claim 9, characterized in that, The diameter of the vent is greater than or equal to 10 micrometers to less than or equal to 50 micrometers, and the spacing between adjacent vents in the same groove is greater than or equal to 0.5 millimeters to less than or equal to 5 millimeters.

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