A mesh tape adhesive tape

Abstract

The utility model relates to a kind of mesh cloth-based adhesive tape, including mesh cloth substrate, back material layer, hot melt adhesive base layer and rubber-based pressure-sensitive adhesive glue layer;Mesh cloth substrate is made of polyethylene fiber, with opposite first face and second face and mesh hole passing through first face and second face, mesh hole aperture is 3~6mm, the density of mesh hole is 3 to 5 holes / square centimeter;Back material layer is made of polyethylene, composite in the second face of mesh cloth substrate;Hot melt adhesive base layer covers the first face of mesh cloth substrate, and is filled into the mesh hole of mesh cloth substrate, so that there is no bubble in mesh hole;The thickness of the first part of hot melt adhesive base layer is 0.5~2 times the thickness of second part, and the surface of first part is smooth and smooth;Rubber-based pressure-sensitive adhesive glue layer is located at the side of hot melt adhesive base layer away from back material layer.The mesh cloth-based adhesive tape can reduce bubble, not easy to deform at high temperature, the adhesion degree of glue layer and substrate is high, and production cost is low.

Description

Technical Field

[0001] This utility model relates to the field of adhesive tape, specifically to a mesh fabric-based adhesive tape. Background Technology

[0002] Mesh-based tapes are widely used in industrial packaging, fixing, and reinforcement due to their mesh structure, lightweight texture, strong tear resistance, and good flexibility. Typically, these tapes are made by directly coating a rubber-based pressure-sensitive adhesive (such as natural rubber or synthetic rubber) onto a mesh substrate. However, several challenging technical problems have always existed in the production of these tapes: (1) Air bubble problem: Because the mesh itself has a porous structure, air is easily trapped in the pores when directly coating liquid rubber adhesive, resulting in a large number of air bubbles and pinholes on the adhesive surface, seriously affecting the product's appearance and quality. (2) Substrate deformation problem: The backing material of the mesh (the side opposite the adhesive surface) is usually a low-cost, weather-resistant PE (polyethylene) film. However, PE material is not heat-resistant, and rubber adhesive needs to be cured in a high-temperature oven (solvent evaporation or cross-linking reaction). At high temperatures, the PE backing material is prone to shrinkage, wrinkling, or even melting and deformation, leading to product scrap. (3) Poor adhesion: To address the issue of PE's inability to withstand high temperatures, the industry employs a transfer coating method (applying adhesive to release paper first, then laminating it with the substrate). However, the rubber adhesive has poor affinity with the mesh fabric (especially the PE material on its surface), easily leading to poor adhesion between the adhesive layer and the substrate, resulting in delamination. (4) Cost issues: To address issues such as substrate deformation, more expensive substrates (such as high-temperature resistant PE or PET) or complex processes are often required, increasing production costs. Therefore, a new solution is urgently needed that can overcome at least one of the above defects while ensuring tape quality and effectively controlling costs. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a mesh fabric-based adhesive tape that reduces air bubbles, is not easily deformed at high temperatures, has high adhesion between the adhesive layer and the substrate, and has low production costs.

[0004] To achieve the purpose of this utility model, this utility model provides a mesh fabric-based adhesive tape, comprising: a mesh fabric substrate made of polyethylene fiber, the mesh fabric substrate having a first side and a second side opposite to each other, the mesh fabric substrate having mesh holes penetrating the first side and the second side, the mesh hole diameter being 3~6mm, and the mesh hole density on the mesh fabric substrate being 3 to 5 holes / square centimeter; a backing layer made of polyethylene, the backing layer being laminated to the second side of the mesh fabric substrate; and a hot melt adhesive underlayer, the hot melt adhesive underlayer covering... The hot melt adhesive underlay is applied to the first surface of the mesh fabric substrate and fills the mesh holes of the mesh fabric substrate, ensuring that there are no air bubbles in the mesh holes; the portion of the hot melt adhesive underlay located on the side of the mesh fabric substrate away from the backing layer is the first portion, and the portion of the hot melt adhesive underlay filling the mesh holes of the mesh fabric substrate is the second portion. The thickness of the first portion is 0.5 to 2 times the thickness of the second portion, and the surface of the first portion is flat and smooth; a rubber-based pressure-sensitive adhesive layer is provided on the side of the hot melt adhesive underlay away from the backing layer.

[0005] In some embodiments of this utility model, the thickness of the mesh fabric substrate is 80~120μm, and the width of the polyethylene fiber filaments forming the mesh is 0.8~1.2mm.

[0006] In some embodiments of this utility model, the total thickness of the first and second parts of the hot melt adhesive underlayer is 0.15~0.25mm.

[0007] In some embodiments of this utility model, the hot melt adhesive underlayer is an ethylene-vinyl acetate copolymer or a styrene-isoprene-styrene block copolymer.

[0008] In some embodiments of this utility model, the rubber-based pressure-sensitive adhesive layer is a natural rubber adhesive, a synthetic rubber adhesive, or an acrylic pressure-sensitive adhesive.

[0009] In some embodiments of this utility model, the thickness of the backing layer is 40~60μm.

[0010] In some embodiments of this utility model, the backing layer is bonded to the second side of the mesh fabric substrate by hot melting or adhesive bonding.

[0011] In some embodiments of this utility model, the thickness of the rubber-based pressure-sensitive adhesive layer is 0.15~0.40mm.

[0012] In some embodiments of this utility model, the mesh fabric-based tape is wound, and the surface of the backing layer of the mesh fabric-based tape away from the mesh fabric substrate is in contact with the rubber-based pressure-sensitive adhesive layer of the next adjacent turn of the mesh fabric-based tape.

[0013] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0014] The structure of the mesh fabric-based rubber tape of this utility model, from bottom to top (or from back to front), consists of a backing layer, a mesh fabric substrate, a hot melt adhesive underlayer, and a rubber-based pressure-sensitive adhesive layer, wherein the hot melt adhesive underlayer fills the mesh holes of the mesh fabric substrate. The mesh fabric-based rubber tape of this utility model can achieve the following effects: (1) Completely eliminates air bubbles. Utilizing the excellent fluidity of the molten adhesive in the molten state, it can completely penetrate and fill all the pores of the mesh, expelling the internal air and forming a bubble-free, smooth interface, providing a perfect base surface for subsequent coating, fundamentally solving the problems of air bubbles and pinholes on the adhesive surface. (2) Compared with the rubber-based pressure-sensitive adhesive layer, the coating and cooling and shaping process of the hot melt adhesive is usually completed at a lower temperature, without the need for a long-term high-temperature drying tunnel, greatly reducing the thermal shock to the backing layer and effectively preventing the backing layer from shrinking and deforming due to heat during the production process. (3) Enhanced bonding strength: Hot melt adhesive, as a highly efficient bonding layer, on the one hand, impregnates and wraps the mesh fiber to form a mechanical anchor, and on the other hand, it has good compatibility and adhesion with the upper rubber adhesive layer. This "connecting the upper and lower layers" role greatly enhances the overall bonding force between the adhesive layer and the substrate, avoiding the risk of delamination. (4) Significantly reduced costs: Using inexpensive hot melt adhesive as a base material replaces some of the more expensive rubber adhesive, reducing raw material costs. At the same time, it improves the yield and efficiency of production, reduces waste and rework caused by problems such as bubbles, deformation, and delamination, and significantly reduces the overall production cost. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the mesh fabric-based adhesive tape of this utility model.

[0016] In the diagram, 1-backing material layer, 2-mesh fabric substrate, 3-hot melt adhesive underlayer, 4-rubber-based pressure-sensitive adhesive layer.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0018] like Figure 1 As shown, an embodiment of this utility model provides a mesh fabric-based tape, which is a single-sided adhesive. This mesh fabric-based tape is lightweight, has strong tear resistance, and good flexibility, and can be used in industrial and daily life applications such as encapsulation, fixing, and reinforcement.

[0019] Specifically, the mesh fabric-based adhesive tape comprises, from bottom to top (from back to front), a backing layer 1, a mesh fabric substrate 2, a hot melt adhesive underlay 3, and a rubber-based pressure-sensitive adhesive layer 4. The mesh fabric-based adhesive tape may consist of the backing layer 1, the mesh fabric substrate 2, the hot melt adhesive underlay 3, and the rubber-based pressure-sensitive adhesive layer 4 arranged sequentially, and contains no other layers besides the backing layer 1, the mesh fabric substrate 2, the hot melt adhesive underlay 3, and the rubber-based pressure-sensitive adhesive layer 4.

[0020] The mesh substrate 2 is made of polyethylene fiber, for example, it can be woven from polyethylene fiber filaments. The mesh substrate 2 has two opposing first and second surfaces, which are two opposing surfaces in the thickness direction of the mesh substrate 2. The mesh substrate 2 has mesh openings penetrating the first and second surfaces, and the mesh substrate 2 can serve as a reinforcement in the mesh-based adhesive tape. The mesh opening diameter is 3~6mm, and the mesh opening diameter can be the diameter of the inscribed circle of the mesh opening, for example, the mesh opening diameter can be 4mm×4mm. The mesh opening density on the mesh substrate 2 is 3 to 5 openings / square centimeter, for example, an average of about 3.7 to 4.3 openings / square centimeter. Using the above-mentioned opening diameter and density, while ensuring the strength of the substrate, combined with the hot melt adhesive underlayer 3, optimal adhesive filling and air venting effects can be achieved, thereby obtaining a smooth, bubble-free adhesive surface.

[0021] The backing layer 1 is made of polyethylene. The backing layer 1 is laminated to the second side of the mesh substrate 2, and the connection between the mesh substrate 2 and the backing layer 1 can improve the strength of the backing layer 1.

[0022] Hot melt adhesive base coat 3 is applied to the first surface of the mesh fabric substrate 2 and fills the mesh openings of the mesh fabric substrate 2, ensuring no air bubbles are present. The hot melt adhesive base coat 3 impregnates and fills the mesh fabric substrate 2. The portion of the hot melt adhesive base coat 3 located on the side of the mesh fabric substrate 2 furthest from the backing layer 1 is the first portion, and the portion of the hot melt adhesive base coat 3 filling the mesh openings of the mesh fabric substrate 2 is the second portion. The thickness of the first portion is 0.5 to 2 times the thickness of the second portion, making the surface of the first portion smooth and flat, facilitating adhesion to the rubber-based pressure-sensitive adhesive layer 4.

[0023] The rubber-based pressure-sensitive adhesive layer 4 is disposed on the side of the hot melt adhesive underlayer 3 away from the backing layer 1. As a functional adhesive layer, the rubber-based pressure-sensitive adhesive layer 4 can provide good tear resistance, flexibility, and bonding strength. The rubber-based pressure-sensitive adhesive layer 4 can be laminated onto the hot melt adhesive underlayer 3 through processes such as transfer coating.

[0024] In this embodiment, the aforementioned layered structure is employed, with the hot melt adhesive underlayer 3 playing a crucial role in "bridging" and "leveling." The hot melt adhesive exhibits better fluidity under heating compared to the rubber-based pressure-sensitive adhesive layer 4, allowing it to completely penetrate and fill all the mesh openings, expelling internal air and forming a bubble-free, smooth surface. This provides a perfect sealing interface for subsequent coatings, fundamentally solving the problems of surface bubbles and pinholes. Compared to the rubber-based pressure-sensitive adhesive layer 4, the coating and cooling / setting process of the hot melt adhesive is typically completed at lower temperatures, eliminating the need for prolonged high-temperature drying tunnels. This significantly reduces thermal shock to the backing layer 1, effectively preventing shrinkage and deformation caused by heat during production. As a highly efficient adhesive layer, the hot melt adhesive, on one hand, impregnates and wraps the mesh fibers, forming a mechanical anchor; on the other hand, it exhibits good compatibility and adhesion with the upper rubber-based pressure-sensitive adhesive layer 4. This "bridging" effect greatly enhances the overall bonding strength between the adhesive layer and the substrate, avoiding the risk of delamination. In addition, hot melt adhesive has a lower cost. It fills the mesh of the mesh fabric substrate 2 and covers the mesh fabric substrate 2, which can reduce the amount of the more expensive rubber-based pressure-sensitive adhesive layer 4. At the same time, it reduces the scrap and rework caused by problems such as bubbles, deformation, and delamination, which helps to reduce the overall cost of the mesh fabric-based tape.

[0025] In some examples, the thickness of the mesh substrate 2 is 80~120μm, and the width of the polyethylene fibers forming the mesh is 0.8~1.2mm to provide good mechanical strength.

[0026] In some examples, the total thickness of the first and second parts of the hot melt adhesive base layer 3 is 0.15~0.25mm, which is beneficial for forming a smooth surface.

[0027] In some examples, the hot melt adhesive base layer 3 is an ethylene-vinyl acetate copolymer or a styrene-isoprene-styrene block copolymer, which has good flowability and good adhesion under heating conditions.

[0028] In some examples, the rubber-based pressure-sensitive adhesive layer is a natural rubber adhesive, a synthetic rubber adhesive, or an acrylic pressure-sensitive adhesive, which has good flexibility and adhesion.

[0029] In some examples, the thickness of the backing layer 1 is 40~60μm. The backing layer 1 has good mechanical properties and can protect the hot melt adhesive underlayer 3.

[0030] In some examples, the backing layer 1 is bonded to the second side of the mesh substrate 2 by hot melting or adhesive bonding. For example, the two can be hot-pressed together by heating the surface of the backing layer 1 and / or the second side of the mesh substrate 2.

[0031] In some examples, the thickness of the rubber-based pressure-sensitive adhesive layer 4 is 0.15~0.40 mm, which provides sufficient pressure-sensitive adhesive performance.

[0032] In some examples, the mesh fabric-based tape is wound, and the surface of the backing layer 1 of the mesh fabric-based tape away from the mesh fabric substrate 2 contacts the rubber-based pressure-sensitive adhesive layer 4 of the adjacent next turn of the mesh fabric-based tape. Because the backing layer 1 is made of polyethylene material with low polarity, the adhesion between the backing layer and the rubber-based pressure-sensitive adhesive layer 4 is small, and it can be used directly as a release surface during winding, saving costs.

[0033] In some examples, the preparation method of the mesh fabric-based adhesive tape of this embodiment can be carried out according to the following steps:

[0034] (1) Preparation of substrate: Select a polyethylene fiber mesh (mesh substrate 2) with a PE film (backing layer 1) laminated on one side. The thickness of the PE film is 50μm, the mesh thickness of the polyethylene fiber mesh is 100μm, the mesh size is 4x4mm, the filament width is about 0.8mm to 1.2mm, and the corresponding pore density is about 3.7 to 4.3 pores / square centimeter. The side of the polyethylene fiber mesh closest to the PE film is the second side (i.e., the back side), and the exposed mesh side of the polyethylene fiber mesh is the first side (i.e., the coated side).

[0035] (2) Applying hot melt adhesive as a base coat 3: Using processes such as extrusion coating, scraping, or spraying, apply molten hot melt adhesive (such as low-cost types like EVA and SIS) to the first surface of the mesh substrate 21. The key point is to control the coating thickness between 0.15mm and 0.25mm. This range is the total thickness. Subtracting the 0.1mm thickness for filling the mesh openings, the remaining excess will be distributed above the mesh ribs and openings, forming a solid and continuous sealing layer, sufficient to completely eliminate air bubbles and provide a smooth base surface for subsequent rubber adhesive layer transfer. This thickness has moderate precision requirements for the coating equipment, is easy to achieve and control, and is process-friendly, allowing the hot melt adhesive to completely fill all the openings of the mesh and form a continuous, flat coating that completely covers the mesh. It is then cooled and cured by a cooling roller.

[0036] (3) Transfer coating of rubber adhesive layer: On another production line, the required rubber-based pressure-sensitive adhesive (such as natural rubber, synthetic rubber adhesive, acrylic pressure-sensitive adhesive) is coated on the release paper. After being properly dried in the drying tunnel, the thickness after drying is 0.15mm-0.40mm. It is then combined with the substrate that has been primed above, so that the rubber-based pressure-sensitive adhesive layer 4 and the hot melt adhesive base layer 3 are tightly bonded together.

[0037] (4) Curing and slitting: After the composite tape is rolled up, it is cured and then slitting and rewinding to obtain the finished product.

[0038] The above production process combines the advantages of direct coating (priming) and transfer coating (topcoat), avoiding the shortcomings of each process, making production more stable and reliable.

[0039] Finally, it should be emphasized that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mesh fabric-based adhesive tape, characterized in that... include: The mesh fabric substrate is made of polyethylene fiber and has a first side and a second side facing each other. The mesh fabric substrate has mesh holes that penetrate the first side and the second side. The mesh hole diameter is 3 to 6 mm and the mesh hole density on the mesh fabric substrate is 3 to 5 holes / square centimeter. A backing layer, the backing layer being made of polyethylene, is laminated to the second side of the mesh fabric substrate; A hot melt adhesive underlayer is applied, covering the first surface of the mesh fabric substrate and filling the mesh openings to ensure no air bubbles are present. The portion of the hot melt adhesive underlayer located on the side of the mesh fabric substrate furthest from the backing layer is the first portion, and the portion of the hot melt adhesive underlayer filling the mesh openings is the second portion. The thickness of the first portion is 0.5 to 2 times the thickness of the second portion, and the surface of the first portion is smooth and flat. A rubber-based pressure-sensitive adhesive layer is disposed on the side of the hot melt adhesive underlayer away from the backing material layer.

2. The mesh fabric-based adhesive tape according to claim 1, characterized in that: The thickness of the mesh fabric substrate is 80~120μm, and the width of the polyethylene fibers forming the mesh is 0.8~1.2mm.

3. The mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The total thickness of the first and second parts of the hot melt adhesive underlayer is 0.15~0.25mm.

4. A mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The hot melt adhesive underlayer is an ethylene-vinyl acetate copolymer or a styrene-isoprene-styrene block copolymer; The rubber-based pressure-sensitive adhesive layer is made of natural rubber, synthetic rubber, or acrylic pressure-sensitive adhesive.

5. A mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The thickness of the backing layer is 40~60μm.

6. A mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The backing layer is bonded to the second side of the mesh fabric substrate by hot melting or adhesive bonding.

7. A mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The thickness of the rubber-based pressure-sensitive adhesive layer is 0.15~0.40mm.

8. A mesh fabric-based adhesive tape according to claim 1 or 2, characterized in that: The mesh fabric-based tape is wound, and the surface of the backing layer of the mesh fabric-based tape away from the mesh fabric substrate is in contact with the rubber-based pressure-sensitive adhesive layer of the next adjacent turn of the mesh fabric-based tape.

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