Anti-tear double-sided tape and use thereof

Abstract

The present application relates to the technical field of double-sided adhesive tape, and particularly relates to a double-sided adhesive tape capable of preventing tearing and application thereof. The double-sided adhesive tape comprises a hand-tearable release film, an adhesive layer and a protective release film which are sequentially stacked, the adhesive layer comprises an adhesive area and a non-adhesive area, the hand-tearable release film comprises a hand-tearable handle, and the hand-tearable handle is arranged above the non-adhesive area; a junction line between the adhesive area and the non-adhesive area is in an arc structure, and an opening end of the arc structure is arranged towards the adhesive area. The double-sided adhesive tape can effectively disperse tearing stress by designing the junction line between the adhesive area and the non-adhesive area as an arc structure, can significantly reduce the risk of fracture of the release film in the initial stage of peeling, and can improve the reliability and production efficiency of peeling operation.

Description

Technical Field

[0001] This invention relates to the field of double-sided tape technology, specifically to a tear-resistant double-sided tape and its applications. Background Technology

[0002] In consumer electronics, display modules, and other fields, FPCs (flexible printed circuit boards) are often fixed using double-sided adhesive tape with a tear-off handle. This double-sided adhesive typically consists of an adhesive layer, a tear-off handle release film covering both sides of the adhesive layer, and a protective release film. The protective release film has a lower peel force than the tear-off release film, preventing reverse release. During the manufacturing process, the double-sided adhesive is processed into a specific shape using a controlled-depth half-cutting process to distinguish between the adhesive and non-adhesive areas, and to form the tear-off handle of the tear-off handle release film.

[0003] In existing technologies, the boundary between the glued and non-glue areas is typically marked with a straight die-cut. This design has a significant drawback: severe stress concentration occurs at the right-angled die-cut points created during die-cutting. When the operator tears the release liner after assembly to remove it, the tearing force is instantly concentrated at this sharp right-angled point. Especially when the release liner is thin or lacks sufficient toughness, it is highly susceptible to breakage at this point during the initial tearing stage, causing the release liner to fail. This greatly inconveniences subsequent assembly, requiring the use of tools such as tweezers for cleaning, severely impacting production efficiency and yield. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a tear-resistant double-sided adhesive and its application, so as to solve the problem that the release film of double-sided adhesive is prone to breakage at the junction during the tearing process.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a tear-resistant double-sided adhesive, comprising a hand-tear release film, an adhesive layer and a protective release film stacked in sequence, wherein the adhesive layer includes an adhesive area and a non-adhesive area, and the hand-tear release film includes a tear handle, wherein the tear handle is disposed above the non-adhesive area; The boundary between the glued area and the non-glued area is an arc-shaped structure, with the open end of the arc-shaped structure facing the glued area.

[0006] Another technical solution adopted in this invention is: the application of the above-mentioned tear-resistant double-sided adhesive for FPC mounting.

[0007] The beneficial effects of the present invention are as follows: The double-sided adhesive of the present invention effectively disperses the tearing stress by designing the boundary line between the adhesive area and the non-adhesive area as an arc structure, which can significantly reduce the risk of breakage of the release film in the initial stage of peeling and improve the reliability and production efficiency of the peeling operation. Attached Figure Description

[0008] Figure 1This is a side view of the double-sided adhesive of Embodiment 1 of the present invention; Figure 2 This is an exploded view of the double-sided adhesive of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the hand-tear release film according to Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the structure of the hand-tear release film of Comparative Example 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the hand-tear release film of Comparative Example 2 of the present invention; Label Explanation: 1. Hand-tear release film; 11. Hand-tear handle; 111. Hand-held area; 112. Connecting area; 12. Covering layer; 2. Colloidal layer; 21. Adhesive area; 22. Non-adhesive area; 3. Protect the release film. Detailed Implementation

[0009] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0010] Please refer to Figure 1 as well as Figure 2 A tear-resistant double-sided adhesive includes a hand-tear release film 1, an adhesive layer 2 and a protective release film 3 stacked in sequence. The adhesive layer 2 includes an adhesive area 21 and an adhesive-free area 22. The hand-tear release film 1 includes a hand-tear handle 11, which is disposed above the adhesive-free area 22. The boundary between the glued area 21 and the non-glue area 22 is an arc-shaped structure, with the opening end of the arc-shaped structure facing the glued area 21.

[0011] As can be seen from the above description, the beneficial effects of the present invention are as follows: The double-sided adhesive of the present invention, by changing the shape of the knife mark, designs the boundary line between the adhesive area 21 and the non-adhesive area 22 as an arc-shaped structure. The opening end of the arc-shaped structure faces the adhesive area 21, and the protrusion (i.e. the bottom of the arc) extends into the non-adhesive area 22. Compared with the conventional straight boundary line, it can effectively disperse the tearing stress, significantly reduce the risk of breakage of the release film in the initial stage of peeling, and improve the reliability and production efficiency of the peeling operation.

[0012] Furthermore, the hand-tear release film 1 also includes a cover layer 12, which is integrated with the hand-tear handle 11, and the cover layer 12 is disposed above the adhesive area 21.

[0013] As can be seen from the above description, the cover layer 12 is used to protect the adhesive area 21; the cover layer 12 and the tear handle 11 are integrated, so that the tear release film 1 can be removed in one go.

[0014] Furthermore, the tear handle 11 includes a hand-held area 111 and a connecting area 112, with the connecting area 112 connecting the cover layer 12 and the tear handle 11.

[0015] As can be seen from the above description, the connection area 112 is the transition section between the handheld area 111 and the cover layer 12.

[0016] Furthermore, the connecting area 112 covers the boundary line between the glued area 21 and the non-glue area 22.

[0017] Furthermore, the width of the connecting area 112 is wider than that of the handheld area 111.

[0018] Furthermore, the width of the connecting area 112 is wider than the end of the cover layer 12 connected to the connecting area 112.

[0019] As can be seen from the above description, at the junction of the arc-shaped structure of the glued area 21 and the non-glue area 22, the width of the tear handle 11 is deliberately widened, thereby forming a reinforcing structure in this area (connection area 112) and enhancing the mechanical strength of the tear initiation point.

[0020] Furthermore, the connecting area 112 is chamfered.

[0021] As can be seen from the above description, the connecting area 112 is chamfered, so that the connecting area 112 and the covering layer 12 and the handheld area 111 are connected in an arc shape, which further disperses the tearing stress.

[0022] Furthermore, the arc-shaped structure can be one of the following: U-shaped, semi-circular, semi-elliptical, or parabolic.

[0023] Furthermore, the protective release film 3 covers the adhesive area 21 and the non-adhesive area 22.

[0024] Furthermore, the protective release film 3 is larger than the colloidal layer 2, making it easier to peel off.

[0025] Another technical solution adopted in this invention is: the application of the above-mentioned tear-resistant double-sided adhesive for FPC mounting.

[0026] Specifically, the process involves first removing the protective release film 3, attaching the adhesive area 21 to the target location, then using the tear handle 11 to peel off the release film 1, and attaching the exposed adhesive area 21 to the target item.

[0027] As can be seen from the above description, when peeling off the release film 1 by hand, the tearing force first acts on the widened connecting area 112, and then evenly cracks and extends outward along the smooth contour of the arc-shaped boundary line between the adhesive area 21 and the non-adhesive area 11, thereby safely and smoothly peeling off the entire release film and greatly reducing the risk of breakage.

[0028] Furthermore, the colloid layer is cut into adhesive area 21 and non-adhesive area 22 using a controlled-depth half-cut process. The release film typically retains knife marks left by the controlled-depth half-cut process.

[0029] Furthermore, during the lamination of the hand-tear release film 1 and the colloidal layer 2, the knife mark on the hand-tear release film 1 does not coincide with the boundary line between the adhesive area 21 and the non-adhesive area 22, in order to avoid stress concentration during tearing and improve the fracture performance at the knife mark. Please refer to Figure 1 and 2 Embodiment 1 of the present invention is: a tear-resistant double-sided adhesive, comprising a hand-tear release film 1, an adhesive layer 2 and a protective release film 3 stacked sequentially; the hand-tear release film 1 is made of PET material with a thickness of 50μm; The colloidal layer 2 includes an adhesive area 21 and an adhesive-free area 22. The boundary between the adhesive area 21 and the adhesive-free area 22 is a "U" shaped structure (arc radius R=0.5mm). The open end of the "U" shaped structure faces the adhesive area 21. The colloidal layer 2 is cut into the adhesive area 21 and the adhesive-free area 22 through a controlled depth half-cutting process. The knife marks left by the controlled depth half-cutting remain on the hand-tearable release film 1. When the hand-tearable release film 1 is laminated with the colloidal layer 2, the knife marks on the hand-tearable release film 1 do not coincide with the boundary between the adhesive area 21 and the adhesive-free area 22, so as to avoid stress concentration during tearing and improve the poor fracture at the knife mark. The hand-tear release film 1 includes a hand-tear handle 11 and a cover layer 12, which are integrated. The hand-tear handle 11 is positioned above the non-adhesive area 22, and the cover layer 12 is positioned above the adhesive area 21. The hand-tear handle 11 includes a hand-holding area 111 and a connecting area 112, which connects the cover layer 12 and the hand-tear handle 11. The connecting area 112 covers the boundary line between the adhesive area 21 and the non-adhesive area 22. The width of the connecting area 112 is 1.5 mm wider than the hand-holding area 111. The width of the connecting area 112 is wider than the end of the cover layer 12 connected to the connecting area 112. The connecting area 112 has a chamfer.

[0030] The protective release film 3 is larger than and covers the adhesive area 21 and the non-adhesive area 22.

[0031] Please refer to Figure 3 Comparative Example 1 of the present invention is: The only difference between Comparative Example 1 and Example 1 is that the boundary line between the glued area 21 and the non-glued area 22 is a straight line; the connecting area 112 and the handheld area 111 are of the same width.

[0032] Please refer to Figure 4 Comparative Example 2 of the present invention is as follows: The only difference between Comparative Example 2 and Example 1 is that the boundary between the glued area 21 and the non-glued area 22 is a trapezoidal structure, with the open end of the trapezoidal structure facing the glued area 21; the connecting area 112 is the same width as the handheld area 111.

[0033] Performance tests were conducted on the double-sided adhesives of Example 1 and Comparative Examples 1 and 2: (1) The breakage rate of the hand-tear release film in double-sided tape was tested at the standard peeling speed (300 mm / min): Example 1 achieved a breakage rate of 0% (0 / 50); in contrast, the breakage rate of Comparative Example 1, which adopted a conventional linear design, was as high as 36% (18 / 50).

[0034] (2) The breakage rate of the hand-tear release film in double-sided tape was tested under more stringent conditions (1000 mm / min) simulating rapid and rough operation: the breakage rate of Example 1 was only 3.3% (1 / 30), while the breakage rate of Comparative Example 1 rose sharply to 86.7% (26 / 30), and the breakage rate of Comparative Example 2 was 20.0% (6 / 30). The above data prove that the present invention can almost completely eliminate the risk of peeling breakage and greatly improve the assembly yield and efficiency.

[0035] (3) The peel force of the release film in the double-sided tape was tested at the standard peel speed (300 mm / min). The test results are shown in the table below:

[0036] The initial peel force of Example 1 is only 1.2N, which is about 57% lower than that of Comparative Example 1 (2.8N) and also lower than that of Comparative Example 2. The lower peel force means that the operation is less strenuous and the experience is more user-friendly. At the same time, the peel force fluctuation coefficient, which measures the stability of the peeling process, is as low as 0.08 in Example 1, which is much lower than that of Comparative Example 1 (0.22) and Comparative Example 2 (0.15). This shows that the double-sided adhesive peeling process of the present invention is smooth and the force value changes steadily, further ensuring the smoothness and controllability of the operation.

[0037] Embodiment 2 of the present invention is as follows: The only difference between Example 2 and Example 1 is that the arc structure is semi-circular.

[0038] Embodiment 3 of the present invention is as follows: The only difference between Example 3 and Example 1 is that the arc structure is semi-elliptical.

[0039] Embodiment four of the present invention is as follows: The only difference between Example 4 and Example 1 is that the arc structure is parabolic.

[0040] Embodiment 5 of the present invention is as follows: The application of the tear-resistant double-sided tape of Embodiment 1 is carried out in the following steps: First, the protective release film is removed, the adhesive area is attached to the target position, and then the release film is peeled off by holding the tear handle, and the exposed adhesive area is attached to the target item.

[0041] In summary, the tear-resistant double-sided adhesive and its application provided by this invention effectively disperse tear stress by changing the shape of the adhesive and non-adhesive areas and by local reinforcement, significantly reducing the risk of release film breakage in the initial stage of peeling, and improving the reliability and production efficiency of peeling operations.

[0042] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention's specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tear-resistant double-sided adhesive, comprising a hand-tear release film, an adhesive layer and a protective release film stacked sequentially, wherein the adhesive layer includes an adhesive area and a non-adhesive area, and the hand-tear release film includes a tear handle disposed above the non-adhesive area; Its features are, The boundary between the glued area and the non-glued area is an arc-shaped structure, with the open end of the arc-shaped structure facing the glued area.

2. The tear-resistant double-sided adhesive according to claim 1, characterized in that, The hand-tear release film also includes a cover layer, which is integrated with the hand-tear handle and is disposed above the adhesive area.

3. The tear-resistant double-sided adhesive according to claim 2, characterized in that, The tear-off handle includes a hand-held area and a connecting area, wherein the connecting area connects the cover layer and the tear-off handle.

4. The tear-resistant double-sided adhesive according to claim 3, characterized in that, The connecting area covers the boundary between the glued area and the non-glued area.

5. The tear-resistant double-sided adhesive according to claim 3, characterized in that, The width of the connection area is wider than that of the handheld area.

6. The tear-resistant double-sided adhesive according to claim 3, characterized in that, The width of the connection area is wider than the end of the cover layer that is connected to the connection area.

7. The tear-resistant double-sided adhesive according to claim 3, characterized in that, The connection area has a chamfer.

8. The tear-resistant double-sided adhesive according to claim 3, characterized in that, The arc-shaped structure is one of the following: U-shaped, semi-circular, semi-elliptical, or parabolic.

9. The tear-resistant double-sided adhesive according to claim 1, characterized in that, The protective release film covers the adhesive area and the non-adhesive area.

10. The application of the tear-resistant double-sided tape as described in any one of claims 1-9, characterized in that, Used for mounting FPCs.

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