Flexible self-adhesive label suitable for curved surface pasting

Abstract

The utility model belongs to the technical field of self-adhesive labels, in particular to a flexible self-adhesive label suitable for curved surface adhesion, which comprises an outer layer, and a printing layer and a protective layer are sequentially coated on the upper surface of the outer layer from bottom to top. According to the flexible self-adhesive label suitable for curved surface pasting, the flexible self-adhesive label suitable for curved surface pasting is arranged and can adapt to curved surface pasting, the middle layer is made of silicon rubber, and controllable and local deformation (such as groove widening / deepening) can be generated when the label is subjected to bending or stretching stress through the stress release groove microstructure; therefore, stress is efficiently absorbed and dissipated, failure caused by the fact that the stress is transmitted to the edge of the label or the interface of the bonding layer is prevented, the stressed stress can be dispersed through the wave grooves, and the situation that the middle layer of the label is broken after being bent multiple times due to stress concentration is avoided.

Description

Technical Field

[0001] This utility model relates to the field of self-adhesive label technology, and in particular to a flexible self-adhesive label suitable for application on curved surfaces. Background Technology

[0002] Self-adhesive labels, also known as self-adhesive labels, instant labels, or instant stickers, are easy to apply. Simply peel them off the backing paper and press them onto various substrates. They offer advantages such as no need for glue, paste, or water, no pollution, and time-saving labeling. They are widely applicable and convenient.

[0003] Chinese Patent No. CN208198803U discloses a self-adhesive label, relating to the field of label technology. The label includes a label body with a rotating assembly mounted on its outer side. A connecting assembly is installed between the rotating assembly and the label body. The rotating assembly includes two L-shaped grips connected at opposite ends and having a second fixing screw hole through their opposite ends. Through this connecting assembly structure, users can adjust the stretch of the self-adhesive tape on the label roll as needed, facilitating the quick removal of multiple labels pasted on one side of the tape. This effectively improves the efficiency of the label body during labeling. The two grips can be connected together by an adjusting groove, a pull rod, a stop, and a compression spring structure. The pull rod can also be connected inside the adjusting groove. Furthermore, the distance between the two grips can be adjusted according to usage requirements, allowing the rotating assembly to be suitable for label bodies of different widths.

[0004] However, the above solutions suffer from insufficient label deformation capability: the substrate or adhesive layer itself has limited flexibility and cannot fully conform to small-radius or rapidly changing curved surfaces, resulting in edge lifting; stress concentration and transmission: when the label is pasted on a curved surface, especially during dynamic bending (such as hoses, wearable devices) or thermal expansion and contraction, internal stress will be generated inside the label. Traditional labels lack an effective stress release mechanism, and stress is concentrated at the edges or specific points, eventually leading to label wrinkling, delamination, or complete detachment; limited adhesive performance: insufficient initial tack, making it difficult to quickly position on curved surfaces; insufficient cohesion, prone to creep or residue under continuous stress; insufficient shear resistance, prone to slippage on dynamic curved surfaces; durability issues: when exposed to environmental factors (UV, humidity, temperature changes, chemical solvents), the label is prone to aging, becoming brittle, discoloring, or losing its adhesiveness. Utility Model Content

[0005] Addressing the technical problem that existing self-adhesive labels cannot fully adhere to curved surfaces with small radii or abrupt changes, resulting in edge lifting, wrinkling, delamination, or complete detachment, and low durability, this utility model proposes a flexible self-adhesive label suitable for curved surface adhesion.

[0006] This utility model proposes a flexible self-adhesive label suitable for curved surface adhesion, including an outer layer, wherein the upper surface of the outer layer is coated with a printing layer and a protective layer from bottom to top.

[0007] The lower surface of the outer layer is bonded with an intermediate layer, the lower center surface of the intermediate layer is bonded with a central layer, and the lower surface edge of the intermediate layer is bonded with an edge layer.

[0008] Preferably, the outer layer is made of an acrylic film, and the printed layer is made of a polyurethane coating.

[0009] Through the above technical solutions, ultra-flexible and highly elastic polyurethane (TPU) films or specially modified acrylate films are used, with an elongation at break >300% and an elastic recovery rate >90%, providing excellent macroscopic deformation capabilities. The thickness is between 20μm and 100μm. The polyurethane coating of the printing layer is composed of water-based polyurethane dispersion and contains organofluorosilicone segments for modification. It is wear-resistant and scratch-resistant: the fluorosilicone segments reduce the surface energy (<20mN / m), giving it self-cleaning and anti-adhesion properties. It is also weather-resistant: it is resistant to UV degradation and has a temperature range of -20°C to 90°C.

[0010] Preferably, the protective layer is made of fluorosilicone modified nanocomposite coating, and the protective layer is applied after the text printing is completed on the printing layer.

[0011] Through the above technical solution, the fluorosilicone modified nanocomposite coating includes fluorosilicone resin, nanofillers: titanium dioxide (UV shielding), silicon carbide nanowires (enhancing mechanical strength), and crosslinking agent: methyltrimethoxysilane (improving adhesion), thereby improving the hydrophobicity of the protective layer, self-cleaning: dust removal rate >90% (simulating rain rinsing), chemical resistance: resistance to immersion in pH2–12 liquid for >7 days, substrate pretreatment: corona treatment (38–42 dyn / cm) or plasma activation, coating adhesion (≥4B grade), coating method is microgravure coating (thickness 3–5μm) or spray coating uniformity (thickness error ±0.2μm), then drying / curing, UV curing: preheating at 80–120℃ + mercury lamp / LE lamp, avoiding bubbles and pinholes during post-curing, two-component coating: 40℃×24 hours, complete crosslinking to improve solvent resistance.

[0012] Preferably, the intermediate layer is made of silicone rubber, and stress relief grooves are formed on both outer surfaces of the intermediate layer. The stress relief grooves are formed by alternating horizontally and vertically arranged wave grooves.

[0013] Through the above technical solution, the material of the intermediate layer is silicone rubber, thermoplastic polyurethane, or microporous foamed elastomer. The stress relief groove microstructure can undergo controllable and localized deformation (such as widening / deepening of the groove) when the label is subjected to bending or tensile stress, thereby efficiently absorbing and dissipating stress and preventing stress from being transmitted to the label edge or adhesive layer interface, which would lead to failure. The corrugated groove can disperse the stress received, preventing stress concentration that would cause the intermediate layer of the label to break after repeated bending.

[0014] Preferably, the depth of the stress relief groove is 10μm-200μm, the width of the stress relief groove is 20μm-500μm, and the spacing between adjacent stress relief grooves is 50μm-1000μm.

[0015] The above technical solutions employ precision micro-molding, laser ablation, or photolithography / etching processes to fabricate the designed stress relief groove microstructure on the stress relief layer.

[0016] Preferably, the material of the central layer is soft acrylic adhesive, and the material of the edge layer is modified silicone.

[0017] Through the above technical solution, the central layer and the edge layer constitute the adhesive layer, which adopts a gradient design or a partitioned design. In the edge area, a high cohesive, high modulus, and creep-resistant adhesive (such as a special cross-linked acrylic adhesive or modified silicone) is used to provide strong anchoring force and resist edge peeling force. In the central area, a high initial tack, low modulus, and high flexibility adhesive (such as a soft acrylic adhesive or rubber-based adhesive) is used to ensure full contact with the curved surface and adapt to local small deformations. The gradient or partitioned coating of the adhesive is achieved by using multi-die head precision coating or partitioned printing technology.

[0018] The beneficial effects of this utility model are as follows:

[0019] By designing flexible self-adhesive labels suitable for curved surfaces, these labels can adapt to curved surfaces. The middle layer is made of silicone rubber, and the stress-relieving groove microstructure allows for controlled, localized deformation (such as groove widening / deepening) when the label is subjected to bending or tensile stress. This efficiently absorbs and dissipates stress, preventing stress from being transmitted to the label edges or adhesive layer interface and causing failure. The corrugated grooves disperse the stress, preventing stress concentration that could cause the middle layer of the label to break after repeated bending. Employing a gradient or partitioned design, the edge areas use high-cohesion, high-modulus, creep-resistant adhesive-modified silicone to provide strong anchoring force and resist edge peeling forces. The central area uses a soft acrylic adhesive with high initial tack, low modulus, and high flexibility to ensure full contact with the curved surface and adapt to localized minor deformations. This solves the technical problem of existing self-adhesive labels being unable to fully adhere to small-radius or rapidly changing curved surfaces, leading to edge lifting, wrinkling, delamination, or complete detachment, and low durability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a flexible self-adhesive label suitable for application on curved surfaces, as proposed in this utility model.

[0021] Figure 2 This is a perspective view of the protective layer structure of a flexible self-adhesive label suitable for curved surface adhesion proposed in this utility model;

[0022] Figure 3 This is a perspective view of the central layer structure of a flexible self-adhesive label suitable for curved surface application proposed in this utility model;

[0023] Figure 4 This is a diagram of the intermediate layer of a flexible self-adhesive label suitable for application on curved surfaces, as proposed in this utility model.

[0024] In the diagram: 1. Outer layer; 2. Printed layer; 3. Protective layer; 4. Intermediate layer; 41. Stress relief groove; 5. Center layer; 6. Edge layer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-4 A flexible self-adhesive label suitable for application on curved surfaces, comprising an outer layer 1.

[0027] Specifically, the outer layer 1 is made of an acrylic film, using an ultra-flexible, highly elastic polyurethane TPU film or a specially modified acrylic film, with an elongation at break of >300% and an elastic recovery rate of >90%, providing excellent macroscopic deformation capabilities, and a thickness between 20μm and 100μm.

[0028] The upper surface of the outer layer 1 is coated with a printing layer 2 and a protective layer 3 from bottom to top.

[0029] Specifically, the material of printing layer 2 is a polyurethane coating; the material of printing layer 2 is a polyurethane coating; the polyurethane coating of printing layer 2 is composed of water-based polyurethane dispersion, containing organofluorosilicone segments for modification, wear and scratch resistance: the fluorosilicone segments reduce surface energy (<20mN / m), giving it self-cleaning and anti-adhesion properties, weather resistance: resistant to UV degradation, temperature range -20°C~90°C, using a combination of plasma treatment + polyurethane coating, taking into account both flexibility and adhesion, first using plasma treatment such as 2kW, 4m / min to activate the BOPP surface, and then applying the polyurethane coating, which can improve ink adhesion by more than 40%, while reducing the coating thickness by 20%, improving the conformability of curved surface bonding.

[0030] Specifically, the protective layer 3 is made of fluorosilicone modified nanocomposite coating. After the text printing of the printing layer 2 is completed, the protective layer 3 is coated. The fluorosilicone modified nanocomposite coating includes fluorosilicone resin, nanofillers: titanium dioxide (UV shielding), silicon carbide nanowires (enhancing mechanical strength), and crosslinking agent: methyltrimethoxysilane (improving adhesion), thereby improving the hydrophobicity of the protective layer. Self-cleaning: dust removal rate >90% (simulating rain rinsing), chemical resistance: resistant to pH2–12 liquid immersion for >7 days, substrate pretreatment: corona treatment (38–42 dyn / cm) or plasma activation, coating adhesion (≥4B grade), coating method is microgravure coating (thickness 3–5μm) or spray coating uniformity (thickness error ±0.2μm), then drying / curing, UV curing: 80–120℃ preheating + mercury lamp / LE lamp, avoiding bubbles and pinholes during post-curing, two-component coating: 40℃×24 hours, complete crosslinking to improve solvent resistance.

[0031] The lower surface of the outer layer 1 is bonded with the middle layer 4.

[0032] Specifically, the intermediate layer 4 is made of silicone rubber, and stress relief grooves 41 are provided on both outer surfaces of the intermediate layer 4. The stress relief grooves 41 are formed by alternating horizontally arranged wave grooves and vertically arranged wave grooves.

[0033] The intermediate layer 4 is made of silicone rubber, thermoplastic polyurethane, or microporous foam elastomer. The stress relief grooves 41 microstructures allow for controlled, localized deformation (such as widening / deepening of the grooves) when the label is subjected to bending or tensile stress. This efficiently absorbs and dissipates stress, preventing stress from being transmitted to the label edge or adhesive layer interface and causing failure. The corrugated grooves can disperse the stress, preventing stress concentration that could cause the intermediate layer 4 of the label to break after repeated bending.

[0034] Specifically, the depth of the stress relief groove 41 is 10μm-200μm, the width of the stress relief groove 41 is 20μm-500μm, and the spacing between adjacent stress relief grooves 41 is 50μm-1000μm; the stress relief groove 41 microstructure is manufactured on the stress relief layer using precision micro molding, laser ablation, or photolithography / etching processes.

[0035] A center layer 5 is bonded to the lower center surface of the intermediate layer 4, and an edge layer 6 is bonded to the lower edge of the intermediate layer 4.

[0036] Specifically, the material of the central layer 5 is soft acrylic adhesive, and the material of the edge layer 6 is modified silicone. The central layer 5 and the edge layer 6 constitute the adhesive layer, which adopts a gradient design or a partitioned design. In the edge area, a high cohesive, high modulus, and creep-resistant adhesive (such as specially cross-linked acrylic adhesive or modified silicone) is used to provide strong anchoring force and resist edge peeling force. In the central area, a high initial tack, low modulus, and high flexibility adhesive (such as soft acrylic adhesive or rubber-based adhesive) is used to ensure full contact with the curved surface and adapt to local small deformations. The gradient or partitioned coating of the adhesive is achieved by using multi-die head precision coating or partitioned printing technology.

[0037] Using low-temperature, high-precision roller-to-roll coating and lamination processes ensures strong bonding between layers without bubbles and maintains the integrity of the microstructure.

[0038] By designing flexible self-adhesive labels suitable for curved surfaces, the labels can adapt to curved surfaces. The middle layer 4 is made of silicone rubber. Through the stress relief grooves 41 microstructure, when the label is subjected to bending or tensile stress, it can undergo controllable, localized deformation, such as widening / deepening of the grooves. This efficiently absorbs and dissipates stress, preventing stress from being transmitted to the label edges or adhesive layer interfaces, which could lead to failure. The corrugated grooves can disperse the stress, preventing stress concentration that could cause the middle layer 4 to break after repeated bending. A gradient or partitioned design is adopted. The edge area uses a high-cohesion, high-modulus, creep-resistant adhesive-modified silicone to provide strong anchoring force and resist edge peeling force. The center area uses a high initial tack, low-modulus, high-flexibility soft acrylic adhesive to ensure full contact with the curved surface and adapt to localized minor deformations. This solves the technical problem that existing self-adhesive labels cannot fully adhere to small-radius or rapidly changing curved surfaces, leading to edge lifting, label wrinkling, delamination, or complete detachment, and low durability.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A flexible self-adhesive label suitable for application on curved surfaces, characterized in that: It includes an outer layer (1), and the upper surface of the outer layer (1) is coated with a printing layer (2) and a protective layer (3) from bottom to top. The lower surface of the outer layer (1) is bonded with an intermediate layer (4), the lower surface of the center of the intermediate layer (4) is bonded with a center layer (5), and the lower edge of the intermediate layer (4) is bonded with an edge layer (6). The intermediate layer (4) is made of silicone rubber. Stress relief grooves (41) are provided on both outer surfaces of the intermediate layer (4). The stress relief grooves (41) are formed by alternating horizontally arranged wave grooves and vertically arranged wave grooves.

2. The flexible self-adhesive label suitable for curved surface application according to claim 1, characterized in that: The outer layer (1) is made of acrylic film, and the printed layer (2) is made of polyurethane coating.

3. The flexible self-adhesive label suitable for curved surface application according to claim 1, characterized in that: The protective layer (3) is made of fluorosilicone modified nanocomposite coating. The protective layer (3) is applied after the text printing is completed on the printing layer (2).

4. A flexible self-adhesive label suitable for curved surface application according to claim 1, characterized in that: The stress relief groove (41) has a depth of 10μm-200μm, a width of 20μm-500μm, and a spacing of 50μm-1000μm between adjacent stress relief grooves (41).

5. A flexible self-adhesive label suitable for curved surface application according to claim 1, characterized in that: The material of the central layer (5) is soft acrylic adhesive, and the material of the edge layer (6) is modified silicone.

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