Tear-resistant, crease-resistant impregnated paper

Abstract

The utility model provides an anti-tear folding impregnated paper, including the base material layer, fiber reinforced layer, impregnated layer, surface protection layer connected in proper order, the base material layer is biaxially oriented polypropylene film, fiber reinforced layer is polyester fiber grid, is fixed on the base material layer through hot melt adhesive point -like adhesion, the impregnated layer is the modified glue solution of melamine -formaldehyde resin and nanometer silicon dioxide compound, and the surface protection layer is poly (vinylidene fluoride) coating. The product has the advantages of preventing crack propagation; the high modulus of biaxially oriented polypropylene base material resists tearing force, and the tearing strength is improved in cooperation.

Description

Technical Field

[0001] This utility model relates to the field of adhesive paper technology, specifically a tear-resistant and fold-resistant impregnated adhesive paper. Background Technology

[0002] Impregnated paper, also known as "melamine" paper, is a type of plain paper or printed decorative paper that has been impregnated with amino resins (melamine-formaldehyde resin and urea-formaldehyde resin) and dried to a certain degree, resulting in a certain resin content and volatile content. It can be glued together with each other or glued to a wood-based panel substrate by hot pressing.

[0003] In recent years, synchronized patterned boards produced by combining impregnated paper with steel plates and wood grain have become popular due to their excellent three-dimensional texture. Melamine-impregnated paper, when pressed at low temperatures for extended periods, can form high-gloss boards, a technique that has also been developed and perfected by many companies.

[0004] Existing impregnated paper suffers from uneven impregnation or paper breakage due to poor adhesive absorption or insufficient tensile strength of the base paper. For example, base paper with a basis weight of less than 60 g / m² is prone to tearing during impregnation, while excessively high basis weight may affect resin penetration efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned issues and provide a tear-resistant and fold-resistant impregnated paper.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a tear-resistant and fold-resistant impregnated paper, comprising a substrate layer, a fiber reinforcement layer, an impregnation layer, and a surface protective layer connected in sequence. The substrate layer is a biaxially oriented polypropylene film, the fiber reinforcement layer is a polyester fiber mesh, which is fixed to the substrate layer by hot melt adhesive in a dotted bonding manner, the impregnation layer is a modified adhesive liquid composed of melamine-formaldehyde resin and nano-silica, and the surface protective layer is a polyvinylidene fluoride coating.

[0007] Furthermore, the substrate layer thickness is 120-150μm, the impregnation layer thickness is 8-10μm, and the surface protective layer thickness is 2-3μm.

[0008] Furthermore, the polyvinylidene fluoride coating has a contact angle >110°, achieving hydrophobic and antifouling functions.

[0009] Furthermore, a laser positioning system is used to adhere the polyester fiber mesh to the surface of the substrate layer. The hot melt adhesive dots are spaced at 2mm × 2mm, and the bonding temperature is 160-180℃, ensuring a peel strength between the fiber and the substrate ≥3N / 15mm.

[0010] Furthermore, the impregnation layer is coated on the interface between the fiber reinforcement layer and the surface protective layer using microgravure coating technology. The viscosity of the adhesive is controlled at 800-1200 mPa·s, the coating speed is 10-15 m / min, and the drying temperature gradient is 80℃-120℃-150℃ to ensure that the nano-silica is uniformly dispersed and the adhesive layer is free of bubbles.

[0011] Advantages of this utility model:

[0012] 1. High-strength polyester (PET) fiber mesh disperses stress through the "anchoring effect" to prevent crack propagation; the high modulus (>4GPa) of biaxially oriented polypropylene substrate resists tearing force, and the two work together to improve tear strength.

[0013] 2. During the hot pressing process, melamine-formaldehyde resin penetrates 50-100μm into the surface of the substrate to form a mechanically interlocked structure; nano-silica fills the micropores, reducing stress concentration points during folding, thus increasing the folding endurance (double folds) from the conventional 500 times. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a tear-resistant and fold-resistant impregnated paper according to this utility model.

[0015] As shown in the figure:

[0016] 11. Substrate layer; 12. Fiber reinforcement layer; 13. Impregnation layer; 14. Surface protective layer. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Combined with appendix Figure 1 A tear-resistant and fold-resistant impregnated paper comprises a substrate layer 11, a fiber reinforcement layer 12, an impregnated layer 13, and a surface protective layer 14 connected in sequence. The substrate layer is a biaxially oriented polypropylene (BOPP) film, and the fiber reinforcement layer is a high-strength polyester (PET) fiber mesh (mesh density 20×20 fibers / cm²), with a fiber diameter of 15-20 μm, fixed by hot melt adhesive dot bonding. The PET fiber has a tensile strength as high as 8.5 cN / dtex, which can significantly improve tear resistance. The impregnated layer is a modified adhesive liquid composed of melamine-formaldehyde resin (MF) and nano-silica (particle size 50-80 nm). The surface protective layer is a polyvinylidene fluoride coating. The MF resin is fully penetrated into the substrate and cured under a pressure of 3-5 MPa, a temperature of 180-200℃, and a time of 15-20 s to form a three-dimensional network structure.

[0019] The substrate layer is 120-150μm thick, the impregnation layer is 8-10μm thick, and the surface protective layer is 2-3μm thick. Its tear resistance is up to 8 times that of ordinary paper, and the die-cutting defect rate is reduced by 42%. The molecular chains are oriented through biaxial stretching process, which improves the mechanical strength in both the longitudinal and transverse directions.

[0020] The polyvinylidene fluoride coating has a contact angle of >110°, achieving hydrophobic and antifouling functions.

[0021] A laser positioning system is used to attach the polyester fiber mesh to the surface of the substrate layer. The hot melt adhesive dots are spaced at 2mm x 2mm, and the bonding temperature is 160-180℃. This ensures that the peel strength between the fiber and the substrate is ≥3N / 15mm.

[0022] The impregnation layer is coated on the interface between the fiber reinforcement layer and the surface protective layer using microgravure coating technology. The viscosity of the adhesive is controlled at 800-1200 mPa·s, the coating speed is 10-15 m / min, and the drying temperature gradient is 80℃-120℃-150℃ to ensure that the nano silica is uniformly dispersed and the adhesive layer is free of bubbles.

[0023] This utility model product replaces traditional corrugated cardboard boxes and is used for the transportation packaging of high-value products such as electronic products and precision instruments, reducing weight while improving the level of protection.

[0024] In corrosive environments such as chemical and petroleum industries, its chemical corrosion resistance is greatly improved, making it a viable alternative to metal signs and reducing overall costs. The UV-resistant coating resists ultraviolet radiation, and the double-layer structure significantly increases its lifespan, making it several times longer than ordinary PVC advertising cloth.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A tear-resistant and fold-resistant impregnated paper, characterized in that: The product comprises a substrate layer, a fiber reinforcement layer, an impregnation layer, and a surface protective layer connected in sequence. The substrate layer is a biaxially oriented polypropylene film, the fiber reinforcement layer is a polyester fiber mesh, which is fixed to the substrate layer by hot melt adhesive in a dotted bonding manner, the impregnation layer is a modified adhesive liquid composed of melamine-formaldehyde resin and nano-silica, and the surface protective layer is a polyvinylidene fluoride coating.

2. The tear-resistant and fold-resistant impregnated paper according to claim 1, characterized in that: The substrate layer has a thickness of 120-150 μm, the impregnation layer has a thickness of 8-10 μm, and the surface protective layer has a thickness of 2-3 μm.

3. The tear-resistant and fold-resistant impregnated paper according to claim 1, characterized in that: The contact angle of the polyvinylidene fluoride coating is >110°.

4. The tear-resistant and fold-resistant impregnated paper according to claim 1, characterized in that: A laser positioning system is used to attach the polyester fiber mesh to the surface of the substrate layer. The spacing between hot melt adhesive dots is controlled at 2mm×2mm, and the bonding temperature is 160-180℃.

5. The tear-resistant and fold-resistant impregnated paper according to claim 1, characterized in that: The impregnation layer is applied to the interface between the fiber reinforcement layer and the surface protective layer using microgravure coating technology.

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