Release film for assisting exhaust of foam rubber

Abstract

The utility model discloses a release film for assisting exhaust of foam rubber, which relates to the technical field of release films and comprises a combined film, the combined film comprises a base layer, a corona layer, a heavy fluorosiloxane release layer and an ultra-light fluorosiloxane release layer are sequentially arranged on the surface of the base layer from inside to outside, a plurality of exhaust channels are arranged on the surface of the combined film, and the exhaust channels are communicated with the corona layer. The exhaust channel is in a long and thin strip shape, the length direction of the exhaust channel is consistent with the length direction of the combined film, the cross section of the exhaust channel is trapezoidal, a guide strip is arranged on the edge of one side of the combined film, and anti-skid protrusions on the guide strip can increase friction force between an operator and the combined film. The combined film can be conveniently and accurately pulled by an operator in the pasting process, foam rubber and a pasted object can be better attached, discharging of bubbles is further promoted, and when pressure is applied by the operator, the foam rubber and the combined film can be conveniently separated by arranging a plurality of grooves.

Description

Technical Field

[0001] This utility model relates to the field of release film technology, and in particular to a release film that assists in the venting of foam adhesive. Background Technology

[0002] Foam adhesive has a wide range of applications, such as electronic device assembly and automotive interior bonding. However, air bubbles are a common problem during foam adhesive application. These bubbles not only affect the aesthetics of the bond but can also reduce the adhesive strength, thus impacting product quality and lifespan.

[0003] Currently, the common method to solve the problem of air bubbles in foam adhesive is manual extrusion to remove air. However, this method is inefficient, and manual operation makes it difficult to ensure consistent air removal. While some release films claim to have auxiliary air removal functions, their actual performance is not ideal.

[0004] Therefore, it is necessary to propose a release film that assists in the venting of foam adhesive to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a release film that assists in venting air from foam adhesive, thereby solving the problem that currently, the common method for resolving air bubbles in foam adhesive is manual extrusion, which is inefficient and makes it difficult to ensure consistent venting results through manual operation. Furthermore, while some release films claim to have venting assistance functions, their actual performance is not ideal.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a release film for assisting in the venting of foam adhesive, comprising a composite film, wherein the composite film comprises a base layer, and a corona layer, a heavy fluorosiloxane release layer and an ultra-light fluorosiloxane release layer are sequentially disposed on the surface of the base layer from the inside out; the surface of the composite film is provided with multiple venting channels, the venting channels are elongated strips, their length direction is consistent with the length direction of the composite film, and the cross-section of the venting channels is trapezoidal.

[0007] Preferably, the upper base width of the trapezoidal structure is 0.1-0.5mm, the lower base width is 0.2-1mm, and a guide strip is provided on one side edge of the composite membrane. The guide strip has a width of 1-3mm and a height of 0.1-0.5mm.

[0008] Preferably, the guide strip is provided with a plurality of anti-slip protrusions, the anti-slip protrusions being hemispherical in shape and having a diameter of 0.05-0.1mm.

[0009] Preferably, the lower surface of the composite membrane is provided with an adhesive layer, and the lower surface of the composite membrane has multiple grooves.

[0010] Preferably, the corona layer is formed by corona treatment on the surface of the base layer, and the corona treatment power is set to 12-22kW.

[0011] Preferably, the heavy fluorosiloxane release layer is formed by coating the corona layer with a heavy release fluorosiloxane release agent and then curing it.

[0012] Preferably, the foam adhesive is adhered to the composite film.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. When the foam adhesive comes into contact with the substrate and pressure is applied, air bubbles in the foam adhesive will move towards the venting channels of the composite membrane under pressure. Due to the trapezoidal cross-section design of the venting channels, air bubbles are more easily expelled along the venting channels.

[0015] 2. At the same time, the anti-slip protrusions on the guide strip can increase the friction between the operator and the composite film, making it easier for the operator to accurately pull the composite film during the pasting process, so that the foam adhesive can better adhere to the object being pasted, further promoting the expulsion of air bubbles. Moreover, when the operator applies pressure, the multiple grooves can facilitate the separation between the foam adhesive and the composite film. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the release membrane structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the guide strip, anti-slip protrusion, and groove of this utility model.

[0018] In the diagram: 1. Base layer; 2. Corona layer; 3. Heavy fluorosiloxane release layer; 4. Ultra-light fluorosiloxane release layer; 5. Exhaust channel; 6. Composite membrane; 7. Guide strip; 8. Anti-slip protrusion; 9. Groove. Detailed Implementation

[0019] This utility model provides, for example Figures 1-2 The release film shown includes a composite film 6, which includes a base layer 1. From the inside out, a corona layer 2, a heavy fluorosiloxane release layer 3, and an ultra-light fluorosiloxane release layer 4 are sequentially disposed on the surface of the base layer 1. The base layer 1 is made of polyethylene terephthalate (PET) film with a thickness of 50-100 μm as the base material. The PET film is cleaned to remove surface impurities and dust. A hot press mold is used to place the cleaned PET film in the mold and hot press it at a temperature of 150-200℃ and a pressure of 1-33 MPa for 3-5 minutes to ensure good molding results. The PET film also possesses good flexibility and mechanical strength, ensuring that the release film is not easily damaged during use.

[0020] The corona layer 2 is formed by corona treatment on the surface of the base layer 1. The corona treatment power is set to 12-22kW. The heavy fluorosiloxane release layer 3 is formed by coating the upper surface of the corona layer with heavy release fluorosiloxane release agent and curing it. This achieves the characteristics of light release force, high residual adhesion, low cost and good release effect.

[0021] To address the current issue of air bubbles in foam adhesive, manual extrusion is commonly used to remove air bubbles. However, this method is inefficient, and manual operation makes it difficult to ensure consistent venting results. While some release films claim to have auxiliary venting functions, their actual effectiveness is not ideal. Therefore, multiple venting channels 5 are provided on the surface of the composite film 6. The venting channels 5 are elongated strips, with their length direction aligned with the length direction of the composite film 6. The cross-section of the venting channels 5 is trapezoidal. It should be noted that the mold has raised structures matching the shape of the venting channels 5, allowing the venting channels 5 to be integrally formed onto the surface of the base layer 1.

[0022] The upper base of the trapezoidal structure has a width of 0.1-0.5mm, and the lower base has a width of 0.2-1mm. A guide strip 7 is provided on one side edge of the composite membrane 6. The guide strip 7 has a width of 1-3mm and a height of 0.1-0.5mm.

[0023] The guide strip 7 is provided with several anti-slip protrusions 8, which are hemispherical in shape and have a diameter of 0.05-0.1mm.

[0024] An adhesive layer is provided on the lower surface of the composite membrane 6, and multiple grooves 9 are provided on the lower surface of the composite membrane 6 for attaching foam to the composite membrane 6.

[0025] Apply the foam adhesive to the composite membrane 6, ensuring full adhesion between the foam adhesive and the composite membrane 6. Clean the surface of the object to be adhered to, removing oil, dust, and other impurities to ensure a good adhesion.

[0026] Specifically, the composite film 6 with foam adhesive is placed on the surface of the object to be bonded, with the guide strip 7 positioned at one edge. The operator holds the guide strip 7 and slowly pulls the composite film 6 while applying appropriate pressure to the foam adhesive, allowing the foam adhesive to gradually adhere to the object. During the pulling process, air bubbles in the foam adhesive will be expelled along the venting channel 5.

[0027] When the foam adhesive comes into contact with the substrate and pressure is applied, air bubbles in the foam adhesive will move towards the venting channel 5 of the composite membrane 6 under pressure. Due to the trapezoidal cross-section design of the venting channel 5, air bubbles are more easily discharged along the venting channel 5.

[0028] Meanwhile, the anti-slip protrusions 8 on the guide strip 7 can increase the friction between the operator and the composite film 6, making it easier for the operator to accurately pull the composite film 6 during the pasting process, so that the foam adhesive can better adhere to the object being pasted, further promoting the expulsion of air bubbles. Moreover, when the operator applies pressure, the multiple grooves 9 can facilitate the separation between the foam adhesive and the composite film 6.

Claims

1. A release film for assisting the venting of foam glue, comprising a combined film (6), the combined film (6) comprising a base layer (1) having a corona layer (2), a heavy fluoro-silicone release layer (3) and an ultra-light fluoro-silicone release layer (4) disposed in order from inside to outside on the surface of the base layer (1), characterized in that: The surface of the combined film (6) is provided with a plurality of exhaust channels (5), the exhaust channels (5) are in the shape of elongated strips, the length direction of the exhaust channels (5) is consistent with the length direction of the combined film (6), and the cross section of the exhaust channels (5) is in the shape of a trapezoid.

2. The foam-assisted venting release film of claim 1, wherein: The cross section of the exhaust channels (5) is in the shape of a trapezoid, the width of the upper base is 0.1-0.5mm, the width of the lower base is 0.2-1mm, one side edge of the combined film (6) is provided with a guide strip (7), the width of the guide strip (7) is 1-3mm, and the height of the guide strip (7) is 0.1-0.5mm.

3. The foam-assisted venting release film of claim 2, wherein: A plurality of anti-skid protrusions (8) are arranged on the guide strip (7), the anti-skid protrusions (8) are in the shape of a hemisphere, and the diameter of the anti-skid protrusions (8) is 0.05-0.1mm.

4. The foam-assisted venting release film of claim 1, wherein: The lower surface of the combined film (6) is provided with a sticking layer, and a plurality of grooves (9) are arranged on the lower surface of the combined film (6).

5. The foam-assisted venting release film of claim 1, wherein: The corona layer (2) is formed by corona treatment on the surface of the base layer (1), and the corona treatment power is set to 12-22kW.

6. The foam-assisted venting release film of claim 1, wherein: The heavy fluorosilicone release layer (3) is formed by coating a heavy release fluorosilicone release agent on the upper surface of the corona layer and then solidifying.

7. The foam-assisted venting release film of claim 1, wherein: The foam adhesive is stuck on the combined film (6).

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