A new type of sealing pressure-sensitive foam tape

Abstract

The utility model discloses a novel sealing pressure sensitive foam tape, including the type paper, pressure sensitive adhesive layer, composite foam matrix and sealing reinforcing layer who are sequentially laminated in the thickness direction, the overall width of foam tape is 6mm, the composite foam matrix inside evenly distributed has the microchannel along the length direction of adhesive tape extension, the section of microchannel is inverted trapezoid, and the opening end of microchannel is to pressure sensitive adhesive layer one side, the one side of sealing reinforcing layer is equipped with the continuous annular flange away from composite foam matrix, the annular flange is along the adhesive tape width direction symmetry distribution, and the height of annular flange is 0.05~0.1mm higher than sealing reinforcing layer surface, the utility model discloses the purpose is to overcome the existing pressure sensitive foam tape sealing performance deficiency, the installation is inconvenient and the defect of poor structural stability.

Description

Technical Field

[0001] This utility model relates to the field of sealing materials technology, specifically to a novel sealing pressure-sensitive foam tape. Background Technology

[0002] Pressure-sensitive foam tape is widely used in sealing applications due to its combination of adhesion and elasticity, but existing products have the following drawbacks: Insufficient sealing performance: Traditional foam tapes have mostly flat surfaces, which can easily lead to leakage due to microscopic gaps when they are applied to the surface being sealed. The sealing performance is significantly reduced, especially in environments with alternating high and low temperatures. Installation is inconvenient: the release paper has smooth edges, making it easy to slip when peeling off, and when the tape width is small (such as 6mm), it is difficult to position accurately, resulting in bonding deviation and affecting the sealing effect; Poor interlayer bonding: The bonding between the foam substrate and the adhesive and sealing layers often relies on simple glue application. Long-term exposure to vibration or humidity can easily lead to delamination and loss of sealing function. Insufficient air release and cushioning: Air bubbles are easily left behind during the bonding process, leading to local seal failure, and it is difficult to balance the cushioning and sealing performance of the foam substrate.

[0003] To address the aforementioned issues, there is an urgent need to design a new type of sealing pressure-sensitive foam tape that offers excellent sealing performance, convenient installation, and stable structure. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing pressure-sensitive foam tapes, such as insufficient sealing performance, inconvenient installation, and poor structural stability, and to provide a new type of sealing pressure-sensitive foam tape.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows: A novel sealing pressure-sensitive foam tape includes release paper, a pressure-sensitive adhesive layer, a composite foam matrix, and a sealing reinforcement layer stacked sequentially along the thickness direction. The overall width of the foam tape is 6mm, suitable for sealing joints of small and medium-sized components. The composite foam matrix has uniformly distributed microchannels extending along the tape's length. The cross-section of each microchannel is an inverted trapezoid, with the opening facing the pressure-sensitive adhesive layer. This inverted trapezoidal structure guides air out during bonding, preventing air bubbles. The sealing reinforcement layer has continuous annular flanges on the side facing away from the composite foam matrix. These annular flanges are symmetrically distributed along the tape's width, and their height is 0.05–0.1mm higher than the surface of the sealing reinforcement layer. The annular flanges can fill the gaps in the sealing surface through compression deformation, enhancing the sealing effect.

[0006] Preferably, the composite foam matrix is ​​composed of EPDM foam and PET mesh fabric, with an overall thickness of 0.4-1.2 mm. EPDM foam has excellent weather resistance and elasticity, while PET mesh fabric can enhance the tear resistance of the matrix. The depth of the microchannel is 1 / 3 to 1 / 2 of the thickness of the composite foam matrix, the spacing between adjacent microchannels is 0.3-0.8 mm, and the inner wall of the microchannel is coated with a silane coupling agent, which can improve the structural stability of the microchannel and prevent collapse after long-term use.

[0007] Preferably, the sealing reinforcement layer is made of modified butyl rubber with an overall thickness of 0.08–0.2 mm. Modified butyl rubber has excellent airtightness and aging resistance. The cross-section of the annular flange is semi-circular, and the width of the annular flange is 0.2–0.5 mm. The spacing between adjacent annular flanges is 1–3 mm. The semi-circular flange can deform uniformly under pressure to form multiple sealing defenses.

[0008] Preferably, the pressure-sensitive adhesive layer is made of solvent-based acrylic pressure-sensitive adhesive with a thickness of 0.06 to 0.12 mm. The side of the pressure-sensitive adhesive layer facing the composite foam substrate has a strip-shaped protrusion that matches the opening end of the microchannel. The strip-shaped protrusion can be embedded into the microchannel opening to increase the contact area between the pressure-sensitive adhesive layer and the composite foam substrate and improve the interlayer bonding force.

[0009] Preferably, the release paper is double-sided silicone paper with a thickness of 0.08 to 0.15 mm, and the edge of the release paper is provided with anti-slip serrations with a width of 0.1 to 0.2 mm; the anti-slip serrations are distributed at intervals along the length of the tape, the length of a single anti-slip serration is 1 to 2 mm, and the spacing between adjacent anti-slip serrations is 3 to 5 mm. The anti-slip serrations can increase the friction during peeling, making it easier to quickly tear the release paper.

[0010] Preferably, the PET mesh fabric has a mesh count of 80-120 and a thickness of 0.03-0.06 mm. The warp and weft threads of the PET mesh fabric intersect with the composite foam substrate to form dot-shaped protrusions with a protrusion height of 0.02-0.05 mm. The dot-shaped protrusions can enhance the surface roughness of the composite foam substrate and improve the adhesion to the sealing reinforcement layer.

[0011] Preferably, the surface of the sealing reinforcement layer is further provided with spaced diamond-shaped recesses, which are located between the annular flanges. The recesses have a depth of 0.02 to 0.04 mm and a side length of 0.3 to 0.6 mm. The diamond-shaped recesses can store a small amount of air during sealing, and the sealing and buffering effect is further improved through air damping.

[0012] Preferably, the composite foam substrate and the sealing reinforcement layer are bonded together by a hot melt adhesive film. The thickness of the hot melt adhesive film is 0.01 to 0.03 mm, and the material is EVA hot melt adhesive. EVA hot melt adhesive has good low-temperature fluidity, which can ensure a tight bond between the composite foam substrate and the sealing reinforcement layer and avoid delamination.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The annular flange of the sealing reinforcement layer is symmetrically distributed along the width of the tape. It can deform uniformly when compressed, filling the micro gaps of the sealed surface and forming multiple sealing defenses. The diamond-shaped pits between the annular flanges can store a small amount of air to form air damping, reducing the gap changes caused by vibration of the sealing surface. It is suitable for use in complex environments such as alternating high and low temperatures. The sealing reinforcement layer is made of modified butyl rubber, which has excellent air tightness, further ensuring the sealing effect.

[0014] (2) The release paper has anti-slip serrations on the edge, which can increase the friction between the fingers and the edge of the release paper, avoid slipping when peeling, and make it easy to quickly tear the release paper; the overall width of the tape is designed to be 6mm, which can be used directly without additional cutting, reducing the risk of misalignment.

[0015] (3) The composite foam substrate adopts a composite structure of EPDM foam and PET mesh cloth. The PET mesh cloth can enhance the overall tear resistance of the substrate and prevent the tape from being damaged by external force during installation or use. The strip protrusions of the pressure-sensitive adhesive layer are embedded with the microchannel openings of the composite foam substrate, increasing the contact area between the two and improving the interlayer bonding tightness. The composite foam substrate and the sealing reinforcement layer are bonded together by EVA hot melt adhesive film. The hot melt adhesive film can fully fill the micro gaps on the contact surface of the two to prevent delamination after long-term use.

[0016] (4) The inverted trapezoidal microchannel inside the composite foam matrix extends along the length direction. When the adhesive is applied, it can guide the air between the tape and the surface to be bonded to be discharged along the microchannel, avoiding the formation of air bubbles due to air residue, which can lead to local sealing failure. At the same time, the elasticity of the EPDM foam combined with the hollow structure of the microchannel can undergo elastic deformation when subjected to impact or vibration, absorbing impact energy and taking into account both sealing function and buffering performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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 an overall view of a novel sealing pressure-sensitive foam tape according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of a novel sealing pressure-sensitive foam tape according to an embodiment of the present utility model; Figure 3 This is a cross-sectional structural diagram of a novel sealing pressure-sensitive foam tape according to an embodiment of the present utility model; Figure 4 This is a partial structural diagram of the bottom of a novel sealing pressure-sensitive foam tape according to an embodiment of the present utility model.

[0019] Reference numerals: 1. Release paper; 2. Pressure-sensitive adhesive layer; 3. Composite foam substrate; 4. Sealing reinforcement layer; 5. Microchannel; 6. Annular flange; 7. Anti-slip serrations; 8. PET mesh fabric; 9. Dot-shaped protrusions; 10. Diamond-shaped pits; 11. Hot melt adhesive film; 12. Strip-shaped protrusions. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] According to an embodiment of the present invention, a novel sealing pressure-sensitive foam tape is provided.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, a novel sealing pressure-sensitive foam tape according to an embodiment of the present invention includes a release paper 1, a pressure-sensitive adhesive layer 2, a composite foam matrix 3, and a sealing reinforcement layer 4 stacked sequentially along the thickness direction. The overall width of the tape is 6mm, and it is suitable for sealing the joint between the back cover and the mid-frame of a smartphone (approximately 5.8mm wide).

[0023] In this embodiment, the release paper 1 is made of double-sided silicone paper with a thickness of 0.12mm. Each of the two sides has anti-slip serrations 7 with a width of 0.15mm. The anti-slip serrations 7 are distributed along the length of the tape, with a single strip length of 1.5mm and an adjacent spacing of 4mm. During installation, when the operator's fingers come into contact with the anti-slip serrations 7, the friction can be increased through the serrations, making it easy to peel the release paper 1 from the surface of the pressure-sensitive adhesive layer 2 without the need for tools.

[0024] Furthermore, the pressure-sensitive adhesive layer 2 is a solvent-based acrylic pressure-sensitive adhesive with a thickness of 0.09 mm. The side facing the composite foam substrate 3 has a strip-shaped protrusion 12 that matches the opening of the microchannel 5. After the strip-shaped protrusion 12 is embedded into the opening end of the microchannel 5, it fits tightly against the inner wall of the microchannel, greatly increasing the contact area between the pressure-sensitive adhesive layer 2 and the composite foam substrate 3, ensuring that the two are firmly bonded.

[0025] Furthermore, the composite foam substrate 3 is composed of EPDM foam and 80-mesh PET mesh fabric 8, with an overall thickness of 0.8mm. The PET mesh fabric 8 is 0.04mm thick, and its warp and weft intersections fuse with the EPDM foam to form dot-shaped protrusions 9 with a height of 0.03mm. The dot-shaped protrusions 9 can increase the surface roughness of the contact surface between the composite foam substrate 3 and the sealing reinforcement layer 4, improving the bonding stability. The composite foam substrate 3 has inverted trapezoidal microchannels 5 extending along the length direction. The depth of the microchannels 5 is 0.3mm (3 / 8 of the substrate thickness), and the adjacent spacing is 0.5mm. The inner wall is coated with a silane coupling agent coating. During bonding, the air between the back cover of the mobile phone and the middle frame can be discharged along the inclined inner wall of the inverted trapezoidal microchannels 5 to avoid air bubble residue. The silane coupling agent coating can enhance the structural strength of the inner wall of the microchannels 5 and prevent the microchannels from collapsing after long-term pressure.

[0026] Furthermore, the composite foam substrate 3 and the sealing reinforcement layer 4 are bonded together by an EVA hot melt adhesive film 11 with a thickness of 0.02 mm. During the bonding process, after the EVA hot melt adhesive film is heated and melted, it can fully fill the gap between the round protrusions 9 on the surface of the composite foam substrate 3 and the sealing reinforcement layer 4. After cooling, a firm connection is formed, preventing peeling between the two layers.

[0027] Furthermore, the sealing reinforcement layer 4 is made of modified butyl rubber with a thickness of 0.15 mm. On the side facing away from the composite foam matrix 3, there are symmetrically distributed annular flanges 6. The cross-section of the annular flanges 6 is semi-circular, with a width of 0.3 mm, a height of 0.08 mm, and an adjacent spacing of 2 mm. There are diamond-shaped recesses 10 between the annular flanges 6, with a depth of 0.03 mm and a side length of 0.4 mm. During assembly, the back cover of the mobile phone and the middle frame compress the annular flanges 6, causing them to deform uniformly and fill the microscopic gap between the back cover and the middle frame, forming three sealing defenses. The air stored in the diamond-shaped recesses 10 can form damping when the mobile phone is vibrated, reducing the deformation fluctuation of the annular flanges 6 and maintaining sealing stability.

[0028] Therefore, the novel sealing pressure-sensitive foam tape of this embodiment can be directly adapted to the joint size in the sealing of the back cover of smartphones. It is easy to install and leaves no air bubbles. The sealing structure can resist the effects of high and low temperatures and vibrations for a long time, ensuring that the inside of the phone is not invaded by dust and moisture, thus meeting the sealing requirements of high-end electronic devices.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel sealing pressure-sensitive foam tape, characterized in that, The material includes a release paper (1), a pressure-sensitive adhesive layer (2), a composite foam substrate (3), and a sealing reinforcement layer (4) stacked sequentially along the thickness direction; the overall width of the foam tape is 6 mm; the composite foam substrate (3) has microchannels (5) uniformly distributed inside, extending along the length of the tape, the cross-section of the microchannels (5) is an inverted trapezoid, and the opening end of the microchannels (5) faces the pressure-sensitive adhesive layer (2); the sealing reinforcement layer (4) has a continuous annular flange (6) on the side away from the composite foam substrate (3), the annular flange (6) is symmetrically distributed along the width direction of the tape, and the height of the annular flange (6) is 0.05 to 0.1 mm higher than the surface of the sealing reinforcement layer (4).

2. The novel sealing pressure-sensitive foam tape according to claim 1, characterized in that, The composite foam substrate (3) is composed of EPDM foam and PET mesh fabric (8), with an overall thickness of 0.4 to 1.2 mm; the depth of the microchannel (5) is 1 / 3 to 1 / 2 of the thickness of the composite foam substrate (3), the spacing between adjacent microchannels (5) is 0.3 to 0.8 mm, and the inner wall of the microchannel (5) is coated with a silane coupling agent.

3. The novel sealing pressure-sensitive foam tape according to claim 1, characterized in that, The sealing reinforcement layer (4) is made of modified butyl rubber with an overall thickness of 0.08 to 0.2 mm; the cross section of the annular flange (6) is semi-circular, and the width of the annular flange (6) is 0.2 to 0.5 mm, with a spacing of 1 to 3 mm between adjacent annular flanges (6).

4. The novel sealing pressure-sensitive foam tape according to claim 1, characterized in that, The pressure-sensitive adhesive layer (2) is made of solvent-based acrylic pressure-sensitive adhesive with a thickness of 0.06 to 0.12 mm. The side of the pressure-sensitive adhesive layer (2) facing the composite foam substrate (3) is provided with a strip-shaped protrusion (12) that matches the opening end of the microchannel (5).

5. The novel sealing pressure-sensitive foam tape according to claim 1, characterized in that, The release paper (1) is double-sided silicone paper with a thickness of 0.08 to 0.15 mm. The edge of the release paper (1) is provided with anti-slip serrations (7) with a width of 0.1 to 0.2 mm. The anti-slip serrations (7) are distributed at intervals along the length of the tape. The length of a single anti-slip serration (7) is 1 to 2 mm, and the spacing between adjacent anti-slip serrations (7) is 3 to 5 mm.

6. The novel sealing pressure-sensitive foam tape according to claim 2, characterized in that, The PET mesh fabric (8) has a mesh count of 80 to 120 and a thickness of 0.03 to 0.06 mm. The warp and weft threads of the PET mesh fabric (8) intersect with the composite foam substrate (3) to form round protrusions (9), with a protrusion height of 0.02 to 0.05 mm.

7. The novel sealing pressure-sensitive foam tape according to claim 3, characterized in that, The surface of the sealing reinforcement layer (4) is also provided with diamond-shaped pits (10) spaced apart. The diamond-shaped pits (10) are located between the annular flanges (6), with a pit depth of 0.02 to 0.04 mm and a side length of 0.3 to 0.6 mm.

8. The novel sealing pressure-sensitive foam tape according to claim 1, characterized in that, The composite foam substrate (3) and the sealing reinforcement layer (4) are bonded together by a hot melt adhesive film (11), the thickness of which is 0.01 to 0.03 mm and the material is EVA hot melt adhesive.

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