Foam tape for ultra-narrow frame

Abstract

The utility model discloses a kind of super-narrow frame foam tape, including sequentially laminated in thickness direction release liner, adaptation layer, composite foam core layer, reinforcing restraint layer and functional glue layer;The overall width of the foam tape is 0.5~4mm, the composite foam core layer is the layered structure with hollow cavity in the inside, the hollow cavity extends along foam tape length direction, and 2~3 elastic support columns are evenly arranged in the inside of hollow cavity, the axis of the elastic support column is parallel with foam tape length direction, the utility model aims at overcoming the defects, such as insufficient size accuracy, poor structural stability, low bonding accuracy, etc.

Description

Technical Field

[0001] This utility model relates to the field of adhesive tape technology, and more specifically, to a foam adhesive tape for ultra-narrow bezels. Background Technology

[0002] As consumer electronics devices become thinner and lighter with narrower bezels, extremely high demands are placed on the foam tape used for bezel bonding. Existing foam tapes have the following problems: The width is difficult to control to below 4mm, and the dimensional tolerance is large, making it unsuitable for installation space with ultra-narrow bezels; The structure is unstable under ultra-narrow width and is prone to deformation and edge damage during cutting, transportation or use; Insufficient interlayer bonding makes delamination prone to occur under long-term vibration or temperature change environments; The low positioning accuracy during bonding makes it difficult to accurately align with the installation position of the ultra-narrow bezel, affecting the product's appearance and sealing performance. It is difficult to balance shock absorption and structural strength, and it cannot meet the dual requirements of ultra-narrow bezel for shock absorption and support stability.

[0003] To address the aforementioned issues, a foam tape specifically designed for ultra-narrow bezels is needed, ensuring both structural stability, bonding precision, and overall performance while maintaining the ultra-narrow width. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing foam tapes in ultra-narrow bezel applications, such as insufficient dimensional accuracy, poor structural stability, and low bonding accuracy, and to provide a foam tape for ultra-narrow bezel applications.

[0005] Therefore, the specific technical solution adopted by this utility model is as follows: A foam tape with an ultra-narrow bezel includes a release liner, an adapter layer, a composite foam core layer, a reinforcing and constraining layer, and a functional adhesive layer, which are stacked sequentially along the thickness direction. The overall width of the foam tape is 0.5-4 mm. The composite foam core layer has a layered structure with a hollow cavity inside. The hollow cavity extends along the length of the foam tape, and 2-3 elastic support columns are uniformly arranged inside the hollow cavity. The axis of the elastic support columns is parallel to the length direction of the foam tape. The adapter layer has an array of micro-protrusions on the side facing the composite foam core layer. The edge of the reinforcing and constraining layer is flush with the edge of the foam tape.

[0006] Preferably, the composite foam core layer is made of PU foam or EPDM foam with an overall thickness of 0.15 to 0.6 mm, the cross-sectional width of the hollow cavity is 1 / 3 to 1 / 2 of the width of the composite foam core layer, the diameter of the elastic support column is 0.05 to 0.1 mm, and the elastic support column is made of nitrile rubber or latex.

[0007] Preferably, the reinforcing constraint layer is made of PET film or PI film with a thickness of 0.008 to 0.025 mm.

[0008] Preferably, the material of the functional adhesive layer is acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive, and the overall thickness is 0.02 to 0.06 mm.

[0009] Preferably, the upper surface of the release liner has spaced positioning scales along its length. The width of the positioning scales is 0.03 to 0.08 mm, the spacing between adjacent positioning scales is 5 to 10 mm, and the color of the positioning scales contrasts visually with the color of the release liner itself.

[0010] Preferably, the material of the adapter layer is a modified polyvinyl alcohol coating with a thickness of 0.001 to 0.004 mm, the height of the micro-protrusions is 8 to 20 μm, and the spacing between adjacent micro-protrusions is 30 to 80 μm.

[0011] Preferably, the two sides of the composite foam core layer are provided with a chamfered structure, the radius of the chamfer is 0.03 to 0.08 mm, and the composite foam core layer is bonded to the adapter layer and the reinforcing constraint layer with epoxy resin adhesive.

[0012] Preferably, the positioning scale is marked with black ink or blue fluorescent ink, and the extension direction of the positioning scale is parallel to the width direction of the foam tape.

[0013] Preferably, the overall width of the foam tape is 0.8 to 3 mm, the dimensional tolerance along the width direction is ≤ ±0.015 mm, and the total thickness along the thickness direction is 0.2 to 0.8 mm.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The overall width is controlled within 0.5 to 4 mm, and the dimensional tolerance is ≤ ±0.015 mm, which can accurately adapt to the installation space of ultra-narrow frame and solve the problem of excessive width or insufficient precision of existing adhesive tape; (2) The composite foam core layer is provided with a hollow cavity and elastic support columns. The hollow cavity can improve the buffering and shock absorption performance, and the elastic support columns can enhance the structural stability, avoid deformation under ultra-narrow width, and take into account both buffering and support requirements. (3) The reinforcing restraint layer is flush with the edge of the tape, which can strengthen the overall structural strength, prevent edge damage during cutting or use, and improve the tear resistance of the ultra-narrow tape. (4) The micro-textures on the surface of the adapter layer can increase the contact area with the composite foam core layer, improve the interlayer bonding force, and prevent delamination; (5) The positioning scale on the release liner can improve the positioning accuracy during bonding, ensure that the tape and the ultra-narrow frame are precisely aligned, and reduce assembly errors; (6) The chamfered structure of the edge of the composite foam core layer can avoid scratching damage to the frame during installation and improve the product yield. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is an overall view of an ultra-narrow bezel foam tape according to an embodiment of the present utility model; Figure 2 This is a partial cross-section of an ultra-narrow bezel foam tape according to an embodiment of the present utility model; Figure 3 This is a cross-sectional schematic diagram of an ultra-narrow bezel foam tape according to an embodiment of the present utility model; Figure 4 This is a partial schematic diagram of the micro-embossed texture of an ultra-narrow bezel foam tape according to an embodiment of the present utility model.

[0017] Figure label: 1. Release liner; 2. Adaptor layer; 3. Composite foam core layer; 4. Reinforcing and restraining layer; 5. Functional adhesive layer; 6. Hollow cavity; 7. Elastic support column; 8. Micro-embossed texture; 9. Positioning scale; 10. Chamfered structure. Detailed Implementation

[0018] 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 drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0019] According to an embodiment of the present invention, a foam tape for ultra-narrow bezels is provided.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4As shown, an ultra-narrow bezel foam tape according to an embodiment of the present invention includes a release liner 1, an adapter layer 2, a composite foam core layer 3, a reinforcing and constraining layer 4, and a functional adhesive layer 5, which are stacked sequentially along the thickness direction.

[0021] In this embodiment, the overall width of the foam tape is 1.5mm, the dimensional tolerance in the width direction is ±0.01mm, and the total thickness is 0.5mm. The release liner 1 is made of PET release film with a thickness of 0.05mm. Its upper surface is printed with black positioning scales 9, with a scale width of 0.05mm and a spacing of 8mm between adjacent scales. The scale direction is parallel to the width direction of the tape, which facilitates precise positioning during bonding.

[0022] The adapter layer 2 is a modified polyvinyl alcohol coating with a thickness of 0.003 mm. The side facing the composite foam core layer 3 has an array of micro-protrusions 8 with a height of 15 μm and a spacing of 50 μm, which can enhance the interlayer bonding force with the composite foam core layer 3.

[0023] The composite foam core layer 3 is made of PU foam with a thickness of 0.3mm. It contains a hollow cavity 6 extending along its length, with a cross-sectional width of 1 / 3 (0.4mm) of the width of the composite foam core layer 3. Two elastic support pillars 7, with a diameter of 0.08mm and made of nitrile rubber, are evenly distributed within the cavity. These pillars maintain the cavity's buffer space and enhance the overall structural stability. The composite foam core layer 3 has chamfered edges 10 with a radius of 0.05mm on both sides to prevent scratching the frame during installation.

[0024] The reinforcing restraint layer 4 is made of 0.015mm thick PET film, with its edges flush with the tape edges. This strengthens the overall structure in ultra-narrow widths and prevents edge damage. The composite foam core layer 3 is bonded to the adapter layer 2 and the reinforcing restraint layer 4 with epoxy resin adhesive to ensure a strong interlayer bond.

[0025] Functional adhesive layer 5 uses acrylic pressure-sensitive adhesive with a thickness of 0.04mm, which can provide stable adhesion and meet the bonding requirements of ultra-narrow bezels.

[0026] The foam tape in this embodiment, through precise width control, the special structure of the composite foam core layer, and the synergistic design of each functional layer, can perfectly adapt to the installation requirements of ultra-narrow bezels of electronic devices. While ensuring cushioning and shock absorption performance, it improves structural stability and bonding accuracy, solving many defects of the prior art.

[0027] 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.

[0028] 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.

[0029] 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 foam tape with an ultra-narrow bezel, characterized in that, It includes a release liner (1), an adapter layer (2), a composite foam core layer (3), a reinforcing and constraining layer (4), and a functional adhesive layer (5) stacked sequentially along the thickness direction; the overall width of the foam tape is 0.5 to 4 mm, the composite foam core layer (3) is a layered structure with a hollow cavity (6) inside, the hollow cavity (6) extends along the length direction of the foam tape, and 2 to 3 elastic support columns (7) are uniformly arranged inside the hollow cavity (6), the axis of the elastic support column (7) is parallel to the length direction of the foam tape; The adapter layer (2) has an array of micro-protrusions (8) on the side facing the composite foam core layer (3), and the edge of the reinforcing constraint layer (4) is flush with the edge of the foam tape.

2. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The composite foam core layer (3) is made of PU foam or EPDM foam, with an overall thickness of 0.15 to 0.6 mm. The cross-sectional width of the hollow cavity (6) is 1 / 3 to 1 / 2 of the width of the composite foam core layer (3). The diameter of the elastic support column (7) is 0.05 to 0.1 mm, and the elastic support column (7) is made of nitrile rubber or latex.

3. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The reinforcing constraint layer (4) is made of PET film or PI film with a thickness of 0.008 to 0.025 mm.

4. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The functional adhesive layer (5) is made of acrylic pressure-sensitive adhesive or silicone pressure-sensitive adhesive, and its overall thickness is 0.02 to 0.06 mm.

5. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The upper surface of the release liner (1) is provided with spaced positioning scales (9) along the length direction. The width of the positioning scales (9) is 0.03 to 0.08 mm, the spacing between adjacent positioning scales (9) is 5 to 10 mm, and the color of the positioning scales (9) forms a visual contrast with the color of the release liner (1).

6. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The material of the adapter layer (2) is a modified polyvinyl alcohol coating with a thickness of 0.001 to 0.004 mm. The height of the micro-protrusions (8) is 8 to 20 μm, and the spacing between adjacent micro-protrusions (8) is 30 to 80 μm.

7. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The composite foam core layer (3) has chamfered structures (10) on both sides of its edges. The radius of the chamfer is 0.03 to 0.08 mm. The composite foam core layer (3) is bonded to the adapter layer (2) and the reinforcing constraint layer (4) with epoxy resin adhesive.

8. The foam tape for ultra-narrow bezels according to claim 5, characterized in that, The positioning scale (9) is marked with black ink or blue fluorescent ink, and the extension direction of the positioning scale (9) is parallel to the width direction of the foam tape.

9. The foam tape for ultra-narrow bezels according to claim 1, characterized in that, The overall width of the foam tape is 0.8 to 3 mm, the dimensional tolerance along the width direction is ≤ ±0.015 mm, and the total thickness along the thickness direction is 0.2 to 0.8 mm.

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