Insulating breakage-proof electrical adhesive tape

Abstract

The invention provides an insulating breakage-proof electrical adhesive tape which comprises an adhesive tape body and a pressure-sensitive adhesive layer arranged on one side of the adhesive tape body, the adhesive tape body is of a multi-layer composite structure, and the adhesive tape body sequentially comprises a wear-resistant surface layer, a weather-resistant water-resisting layer, a closed-cell micro-foaming buffer layer, a main body insulating layer and an inner reinforcing layer in the direction from a non-adhesive surface to an adhesive surface; the pressure-sensitive adhesive layer is arranged on the adhesive surface side of the inner reinforcing layer; a plurality of pre-tension indicating units are arranged on the adhesive tape body at intervals in the length direction, each pre-tension indicating unit comprises a bending overlapping part and an elastic layer which are formed on the non-adhesive surface of the adhesive tape body, and the two ends of the elastic layer are connected with the main body insulating layer and the outermost layer of the bending overlapping part respectively; when the adhesive tape is stretched to a set pre-tension force, the bending overlapping part is straightened from a bending state; according to the invention, the problems proposed in the background technology are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of adhesive tape, in particular to an insulating and anti-breaking electrician's adhesive tape. BACKGROUND

[0002] The electrician's adhesive tape is one of the most commonly used auxiliary materials in electrical installation, wiring harness processing, cable joint insulation and protection. The most widely used product on the market is usually a PVC base film + pressure-sensitive adhesive layer structure. When in use, a certain pre-stretching is performed for spiral winding, so that the adhesive tape generates a rebound holding force on the covered object and provides electrical insulation isolation. However, in actual engineering applications, the traditional electrician's adhesive tape still has the following typical problems: 1. In the positions of cable joints, terminal crimping areas, and wiring harness bifurcations, etc., the common structure has steps, edges or local hard points. The traditional single-layer or weakly reinforced PVC base film is prone to stress concentration at the edges, forming small cuts or edge cracks, and then longitudinal tearing and expansion occur when continuing to wind or being vibrated and rubbed, resulting in a decrease in the integrity of the insulation layer.

[0003] 2. A large number of failure cases do not start from the perforation of the middle of the adhesive tape, but from the cracks at the side edges and burrs. Since the tape is stretched during winding, the cracks are more likely to expand along the length direction, and the phenomenon of "tearing along the direction of the adhesive tape" occurs; this phenomenon is more obvious when the temperature is low, the adhesive tape is aged, or the adhesive tape is thin.

[0004] 3. When the adhesive tape is long-term exposed to temperature differences, humidity, oil stains, ultraviolet light, or heat sources, the base film may harden, crack, or have a decrease in rebound performance; the adhesive layer may also have a decrease in adhesion and edge warping. Once the adhesive tape is loose and displaced, the insulation covering thickness at the electrical joint is thinned, which is prone to cause creeping, breakdown and other hidden dangers.

[0005] 4. The pre-stretching degree of the traditional adhesive tape mainly depends on the experience of the construction personnel: insufficient stretching leads to insufficient rebound holding force and displacement in the later period; excessive stretching causes the base film to be thinned or even broken, or the base film is more easily cut at the edges. Due to the lack of intuitive indication, it is difficult to ensure the consistency of the winding quality of different personnel and different working conditions on site.

[0006] Therefore, it is necessary to provide a new insulating and anti-breaking electrician's adhesive tape to solve the above technical problems. SUMMARY

[0007] To solve the above technical problems, the present application provides an insulating and anti-breaking electrician's adhesive tape, which solves the problems raised in the background art.

[0008] The insulating and break-proof electrical tape comprises a tape body and a pressure-sensitive adhesive layer arranged on one side of the tape body, wherein the tape body is a multilayer composite structure, and comprises, from the side of the adhesive-free surface to the side of the adhesive surface, a wear-resistant surface layer, a weather-resistant and water-resistant layer, a closed-cell micro-foamed buffer layer, a main insulating layer, and an inner reinforcing layer. The pressure-sensitive adhesive layer is arranged on the adhesive surface side of the inner reinforcing layer. The tape body is provided with a plurality of pre-tension indication units arranged at intervals along the length direction, wherein each pre-tension indication unit comprises a bending and overlapping part formed on the adhesive-free surface of the tape body and an elastic layer, and the two ends of the elastic layer are connected with the main insulating layer and the outermost layer of the bending and overlapping part, respectively, so that the bending and overlapping part is straightened from the bent state when the tape is stretched to a set pre-tension. At least one longitudinal side edge of the tape body is provided with a crack-resistant structure for inhibiting the expansion of tearing from the side edge.

[0009] In a preferred embodiment, the crack-resistant structure is an edge reinforcing tape arranged along the length direction of the tape, and the edge reinforcing tape is arranged at at least one longitudinal side edge of the tape body and is combined with the wear-resistant surface layer and the inner reinforcing layer.

[0010] In a preferred embodiment, the crack-resistant structure is a stress release groove formed on the side surface of the tape body, and the stress release groove is arranged at intervals along the length direction of the tape.

[0011] In a preferred embodiment, the depth of the stress release groove is 10% to 40% of the total thickness of the tape body, and the distance between adjacent stress release grooves is 20 to 80 mm.

[0012] In a preferred embodiment, the wear-resistant surface layer is a polyester film PET layer with a thickness of 10 to 50 μm, and the inner reinforcing layer is a polyester film PET layer and a fiber grid reinforcing layer with a thickness of 15 to 80 μm.

[0013] In a preferred embodiment, the weather-resistant and water-resistant layer is a silicone rubber film layer with a thickness of 10 to 40 μm, the closed-cell micro-foamed buffer layer has a thickness of 50 to 250 μm, and the main insulating layer is a PVC insulating layer with a thickness of 80 to 200 μm.

[0014] In a preferred embodiment, the width of the elastic layer is not greater than 1 / 2 of the width of the tape, and the elastic layer is arranged on the same side of the center line in the width direction of the tape.

[0015] In a preferred embodiment, the pressure-sensitive adhesive layer is a weather-resistant and heat-resistant pressure-sensitive adhesive layer, and the outer side of the pressure-sensitive adhesive layer is covered with a release film layer for winding and storage.

[0016] The present application has the following advantages: 1. The wear-resistant surface layer in the multi-layer composite structure improves the surface's resistance to wear and scratches; the inner reinforcing layer inhibits the propagation of cracks along the length direction; the closed-cell micro-foamed buffer layer provides deformation buffering at corners / steps, reducing stress concentration-induced cutting, tearing, and pinhole damage, thus structurally improving tear resistance, puncture resistance, and abrasion resistance.

[0017] 2. By forming a side crack-resistant structure through edge reinforcement strips or stress relief grooves, the side becomes a crack-resistant enhancement zone or realizes segmented stress release on the side, reducing the probability that micro-notches on the side will evolve into long cracks under tension, thereby improving the reliability under construction tension and long-term vibration and friction conditions.

[0018] 3. The main insulation layer provides primary dielectric isolation, the buffer layer improves adhesion to irregular surfaces and reduces internal voids in the covering layer, and the weather-resistant waterproof layer enhances the barrier against water vapor penetration, making the covered insulation layer less prone to loosening and displacement due to environmental changes.

[0019] 4. The pretension indicator unit allows the construction worker to intuitively judge whether the tension has reached the set pretension through the shape change of the bending and overlapping part, reducing the two types of problems: "insufficient tension leading to loosening" and "excessive tension leading to thinning and damage"; at the same time, the elastic layer can be designed as a tearable structure to avoid deformation of the outer layer caused by long-term pull-back, and improve long-term service stability. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the layered structure of the insulating and anti-damage electrical tape of the present invention; Figure 2 This is a plan view of the electrical tape of the present invention in its unfolded state, showing the arrangement of the pre-tension indicator unit; Figure 3 This is a schematic diagram of the stress relief groove on the side of the electrical tape of the present invention; Figure 4 This is a cross-sectional schematic diagram of the electrical tape of the present invention with an edge reinforcement strip.

[0021] The labels in the diagram are as follows: 1. Wear-resistant surface layer; 2. Weather-resistant and waterproof layer; 3. Closed-cell micro-foamed buffer layer; 4. Main insulation layer; 5. Inner reinforcing layer; 6. Tape body; 7. Pressure-sensitive adhesive layer; 8. Release film layer; 9. Bending and overlapping part; 10. Elastic layer; 11. Stress relief groove; 12. Edge reinforcement strip; S, Stress relief groove spacing; M, Width direction; L, Length direction; CL, Centerline. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please refer to the following: Figure 1 , Figure 2 ,Figure 3 as well as Figure 4 ,in Figure 1 This is a schematic cross-sectional view of the layered structure of the insulating and anti-damage electrical tape of the present invention; Figure 2 This is a plan view of the electrical tape of the present invention in its unfolded state, showing the arrangement of the pre-tension indicator unit; Figure 3 This is a schematic diagram of the stress relief groove on the side of the electrical tape of the present invention; Figure 4 This is a cross-sectional schematic diagram of the electrical tape of the present invention with an edge reinforcement strip.

[0024] In the specific implementation process, such as Figures 1-4 As shown, the tape body 6 of the present invention has a multi-layer composite structure, which includes, from the non-adhesive surface to the adhesive surface, the following components in sequence: Abrasion-resistant surface layer 1: preferably polyester film (PET). Its function is to improve the surface's abrasion resistance and scratch resistance, and reduce surface damage caused by external friction; at the same time, it provides dimensionally stable support for the underlying layer.

[0025] Weather-resistant waterproof layer 2: preferably a silicone rubber film layer. Its function is to improve the barrier to water vapor penetration and enhance the heat resistance and low-temperature cycling performance.

[0026] Closed-cell microfoamed buffer layer 3: preferably a closed-cell microfoamed elastic layer. Its function is to provide local deformation buffer when the coated material has sharp edges or steps, reduce stress concentration, and reduce the probability of "edge cutting / point pressure damage". The closed-cell structure can also inhibit the migration of water vapor along the inner layer.

[0027] Main insulation layer 4: preferably a flexible PVC insulation layer, used to provide main dielectric isolation and stretchable wrapping performance.

[0028] Inner reinforcing layer 5: preferably a PET film layer or a fiber mesh reinforcing layer, used to improve longitudinal tensile strength and tear propagation resistance, and to inhibit the tear from continuing to propagate along the length direction.

[0029] Pressure-sensitive adhesive layer 7: Located on the adhesive side of the inner reinforcing layer E, it is used for bonding and fixing. The pressure-sensitive adhesive is preferably a weather-resistant and heat-resistant formulation to reduce flow and tack degradation in high-temperature environments. The outer side of the pressure-sensitive adhesive layer 7 is also covered with a release film layer 8 for winding and storage, preventing contamination of the adhesive surface.

[0030] To suppress crack initiation from the longitudinal side, the present invention provides a crack-resistant structure on at least one longitudinal side, and two possible implementation schemes are given below: Option 1: Edge reinforcement strip Before the tape body is cut, a narrow reinforcing strip (such as a PET strip of the same material as the inner reinforcing layer 5, or a fiber-reinforced strip) is laminated to the edge areas on both sides of the master roll to form an "edge skeleton".

[0031] The edge reinforcement strip 12 can be bonded and combined with the wear-resistant surface layer 1 and the inner reinforcement layer 5, so that the equivalent thickness and crack resistance of the side area are higher than those of the central area, thereby reducing the crack propagation caused by the micro-notch on the side.

[0032] Option 2: Stress relief groove 11 Shallow grooves are formed on the side of the tape body 6, spaced apart along its length. The groove depth is 10% to 40% of the total thickness of the tape body, and the spacing between adjacent grooves is 20 to 80 mm. These shallow grooves are not used for tear guidance, but rather serve to "segment peak reduction": when the tape is under tension, the peak stress on the side is dispersed at the groove location, reducing the risk of rapid crack propagation caused by continuous edge tension.

[0033] To visualize the pre-tension of the tape, this invention provides several pre-tension indicator units spaced apart along the length of the tape. Each indicator unit includes: 1. Bending and overlapping section 9: A partial folded and layered structure is formed on the non-adhesive surface by pressing / folding; the bending shape is maintained before the pre-tension is reached.

[0034] 2. Elastic layer 10: disposed on the non-adhesive surface, with both ends of the elastic layer 10 connected to the main insulating layer D and the outermost layer of the bent and overlapped portion, respectively.

[0035] The working mechanism is as follows: When the construction worker applies tension to the tape, the elastic layer 10 is stretched and applies an unfolding force to the bent and overlapping part 9; when the tension reaches the set pre-tension threshold, the bent and overlapping part is straightened (or a significant change in shape occurs), and the construction worker can intuitively judge whether the current tension meets the standard.

[0036] To avoid the elastic layer 10 affecting the subsequent wrapping appearance and long-term pullback, in a preferred embodiment: The elastic layer width is ≤ 1 / 2 of the tape width and is located on the same side of the center line in the tape width direction so as to remain visible and operable during winding; The elastic layer can be designed as a "tearable connection", that is, after the first round of positioning is completed and the pre-tension is confirmed, the elastic layer can be torn off and then the winding can continue to be repeated, thereby eliminating the risk of encapsulation deformation caused by long-term elastic pull-back.

[0037] The tape of this invention can be prepared using a continuous roll-to-roll process, as illustrated in the following example: S1: Prepare wear-resistant surface layer 1 (PET film), weather-resistant and waterproof layer 2 (silicone rubber film), buffer layer 3 (closed-cell foamed sheet or online foamed film), main insulating layer 4 (PVC film) and inner reinforcing layer 5 (PET film or fiber mesh layer).

[0038] S2: Perform the compounding in the order of 1-2-3-4-5: The lamination method can be hot-press lamination, adhesive lamination or extrusion lamination; Before lamination, the PET surface can be subjected to corona / plasma treatment to improve interfacial adhesion. The composite tension and roller pressure are controlled within a range that will not collapse the closed-cell structure, so as to maintain the elasticity and closed-cell characteristics of the buffer layer.

[0039] S3: Apply pressure-sensitive adhesive layer 7 to the adhesive side of the inner reinforcing layer 5 and complete curing / evaporation, then attach the release film.

[0040] S4: Forming a bent and overlapping section on the non-adhesive surface 9: Using a positioning pressure roller or folding mechanism, the belt body is locally pressed and folded according to the pitch to form a bent and overlapping section.

[0041] S5: Apply the elastic layer: Apply the elastic layer to the designated area of ​​the non-adhesive surface at the specified pitch. The two ends of the elastic layer are respectively connected to the outer layer of the main insulation layer 4 and the bent overlapping part 9. The adhesive for the elastic layer 10 can be a peelable adhesive to allow it to be removed after construction.

[0042] S6: Forms a crack-resistant structure. If edge reinforcement strip 12 is used, then a narrow reinforcement strip is composited before cutting; If a stress relief groove S is used, shallow grooves are formed on the side by side rolling / pressing rollers.

[0043] S7: Cut and rewind to obtain the finished tape.

[0044] Example 1 (using stress relief grooves + tearable elastic layer) Abrasion-resistant surface layer 1: PET film, 25μm thick; Weather-resistant and waterproof layer 2: Silicone rubber film, 20μm thick; Buffer layer 3: Closed-cell micro-foamed layer, 150μm thick; Main insulation layer 4: Flexible PVC layer, 120μm thick; Inner reinforcing layer 5: PET film, 40μm thick; Pressure-sensitive adhesive layer 7: Weather-resistant and heat-resistant pressure-sensitive adhesive, coating amount approximately 30g / m² 2 Covered with a release film; Stress relief groove: The groove depth is approximately 20% of the total thickness, and the groove spacing is 50mm; The pretension indicator unit has a pitch of 50mm; the unfolded length of the bent and overlapped part is about 8mm; the elastic layer 10 is a TPE elastic strip with a width of about 1 / 3 of the tape width, and it is fixed with peelable adhesive for easy removal after construction.

[0045] During construction: Place the end of the tape on the area to be covered, stretch it until the bent and overlapping part is straight, and then start spiral winding. The outer layer covers the inner layer by a width of ≥1 / 2. After completing the first round of positioning, remove the elastic layer 10, and continue to wind back and forth until the required thickness is reached. Finally, press the tail end firmly.

[0046] Example 2 (using edge reinforcement strip) Based on Example 1, the stress relief groove S is removed, and a narrow fiber reinforcement strip (or thickened PET edge strip) is laminated on each side of the tape to form an edge skeleton, which improves the side crack resistance and is suitable for higher frequency friction or higher tensile stress scenarios.

[0047] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An insulating and break-proof electrical tape, comprising a tape body (6) and a pressure-sensitive adhesive layer (7) arranged on one side of the tape body (6), characterized in that: the tape body (6) is a multi-layer composite structure, comprising, from the non-adhesive side to the adhesive side, a wear-resistant surface layer (1), a weather-resistant water-blocking layer (2), a closed-cell micro-foamed buffer layer (3), a main insulating layer (4), and an inner reinforcing layer (5); the pressure-sensitive adhesive layer (7) is arranged on the adhesive side of the inner reinforcing layer (5); the tape body (6) is provided with a plurality of pre-tension indication units arranged at intervals along the length direction, each pre-tension indication unit comprising a bending and overlapping portion (9) formed on the non-adhesive side of the tape body (6) and an elastic layer (10), both ends of the elastic layer (10) being connected with the main insulating layer (4) and the outermost layer of the bending and overlapping portion (9), respectively, so that the bending and overlapping portion (9) is straightened from the bent state when the tape is stretched to a set pre-tension; and at least one longitudinal side edge of the tape body (6) is provided with an anti-cracking structure for inhibiting the propagation of tearing from the side edge. The anti-cracking structure is an edge reinforcing tape (12) arranged along the length direction of the tape, which is arranged at at least one longitudinal side edge of the tape body (6) and is combined with the wear-resistant surface layer (1) and the inner reinforcing layer (5). The anti-cracking structure is a stress release groove (11) formed on the side surface of the tape body (6), which is arranged at intervals along the length direction of the tape. The depth of the stress release groove (11) is 10% to 40% of the total thickness of the tape body (6), and the distance between adjacent stress release grooves (11) is 20 to 80 mm. The wear-resistant surface layer (1) is a polyester film (PET) layer with a thickness of 10 to 50 μm, and the inner reinforcing layer (5) is a polyester film (PET) layer and a fiber grid reinforcing layer with a thickness of 15 to 80 μm.

2. The insulating, breakproof electrical tape of claim 1, wherein, The weather-resistant water-blocking layer (2) is a silicone rubber film layer with a thickness of 10 to 40 μm, the closed-cell micro-foamed buffer layer (3) has a thickness of 50 to 250 μm, and the main insulating layer (4) is a PVC insulating layer with a thickness of 80 to 200 μm.

3. The insulating, puncture-resistant electrical tape of claim 2, wherein, The width of the elastic layer is not greater than 1 / 2 of the width of the tape, and the elastic layer is arranged on the same side of the center line in the width direction of the tape.

4. The insulating, puncture-resistant electrical tape of claim 3, wherein, The pressure-sensitive adhesive layer (7) is a weather-resistant and heat-resistant pressure-sensitive adhesive layer (7), and the outer side of the pressure-sensitive adhesive layer (7) is covered with a release film layer (8) for winding and storage.

5. The insulating, puncture-resistant electrical tape of claim 4, wherein, ​ 6. The insulating, puncture-resistant electrical tape of claim 5, wherein, ​ 7. The insulating, puncture-resistant electrical tape of claim 6, wherein, ​ 8. The insulating, puncture-resistant electrical tape of claim 7, wherein, ​

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