Multilayer composite paper

Abstract

This invention provides a multilayer composite paper that combines the texture of paper with the moisture-reinforcement properties of nonwoven fabrics, while also having relatively low manufacturing costs and being applicable to high-quality everyday paper. [Solution] The multilayer composite paper includes a first paper layer 2, a paper core 3 is laminated to the first paper layer, a second paper layer 4 is laminated to the paper core, a hydrophilic layer is installed inside the paper core, a reinforcing layer is laminated to the hydrophilic layer, and an antibacterial layer is laminated to the reinforcing layer.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-layer composite paper, and particularly to multi-layer composite paper.

Background Art

[0002] Multi-layer composite paper is a paper product formed by laminating paper, paperboard and other materials (such as plastics, aluminum foils, cloth, etc.) through composite processing technology. Such materials not only improve the appearance performance and strength of paper and paperboard, but also enhance their waterproof, moisture-proof, oil-resistant, airtight fragrance-preserving and other properties, and have heat-sealing property, light-shielding property and heat resistance.

[0003] As people's requirements for the quality of life increase, the demand for household paper also increases. After the wiping paper developed from the initial single-layer paper to two-layer paper, multi-layer papers such as three-layer paper, four-layer paper, five-layer paper, six-layer paper, etc. have emerged in the market, improving the quality feeling and applicability when in use. Pulp has the advantages of strong wiping force, being gentle to the skin and low cost, so it has always been the top-priority raw material in the industry. Currently, all multi-layer papers sold in the market are manufactured with 100% pulp, with increased thickness and quality feeling, but their strength in wet conditions is low and they are not applicable for wiping when wet tissues or a large amount of water accumulates. Also, as another segmented market of wiping materials, composite non-woven wipes are relatively popular in the market. The raw materials of spunlace non-woven fabrics are viscose fibers or polyester fibers, with extremely improved strength, but these two types of fibers do not have the fibrillation characteristics of pulp fibers, and the skin feel when wiping is not as good as that of paper products, and the cost is also more than twice higher than that of paper products.

[0004] The prior art patent, patent number ZL200720138039.5, discloses multilayer composite wipes, and the overall technical solution of this patent is as follows: The material consists of three layers, including a first wiping layer which uses one of the materials of spunlace nonwoven fabric or dust-free paper and includes, but is not limited to, a plain weave or mesh nonwoven fabric material formed by weaving together viscose fibers, polypropylene fibers or polyester, and gives the wiping layer 1 a relatively good water absorption and penetration effect; including a second water-retaining layer which uses one of the materials of bulky nonwoven fabric or fiber and includes, but is not limited to, a material having relatively strong water-retaining properties such as a bulky polypropylene fiber fabric; one or more of the following are used between the first and second layers: adhesive bonding, mechanical bonding, thermal bonding or ultrasonic bonding; and the third layer is cast and composited using a PE film to meet the usage requirements for strength and flexibility. The problems that exist in the usage process of the above prior art are as follows: The first layer uses nonwoven fabric and is limited to a minimum basis weight technology. As described in the patent, the minimum basis weight is 30 gsm when it is spunlace nonwoven fabric and 45 gsm when it is dust-free paper. High basis weight not only results in high costs but also causes the texture to be stiff after compounding, the fibers to lack fibrillation characteristics, and reduced comfort when wiping. The third layer uses cast compounding, which causes a reduction in the final water absorption of the cloth, damages the thickness of the cloth, and reduces the user experience. This invention patent aims to develop a paper-cloth composite wiping material that simultaneously possesses the skin-friendliness of paper and the moisture-reinforcing properties of nonwoven fabric, and is balanced in cost between paper and nonwoven fabric. By incorporating a highly bulky nonwoven fabric layer between two layers of paper, the wet-reinforcement properties are increased, the bulkiness is enhanced, and a firm bond between each layer is ensured. This results in a material that is gentle on the skin, highly moist-reinforced, and cost-effective. Conventional composite wiping cloths all use either cloth-cloth composites or paper-paper composites. The technical difficulty of cloth-paper composites lies in selecting suitable paper and nonwoven fabrics whose two material properties are compatible, making them suitable for smooth processing in the composite process.

[0005] Therefore, in response to the problems of conventional composite papers mentioned above, which lack texture after production and are relatively low-humidity and costly, it is possible to design multilayer composite papers that possess the texture of paper and the moisture-reinforced properties of nonwoven fabrics through the composite materials, while also having relatively low manufacturing costs and being applicable to high-quality everyday paper. [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] This is to overcome the problems of conventional composite paper, which does not conform to the skin after production, and is also relatively low in humidity and expensive. [Means for solving the problem]

[0007] The technical details of this invention are as follows: The multilayer composite paper includes a first paper layer, a nonwoven fabric is laminated to the first paper layer, a second paper layer is laminated to the nonwoven fabric, a hydrophilic layer is installed inside the nonwoven fabric, a reinforcing layer is laminated to the hydrophilic layer, and an antibacterial layer is laminated to the reinforcing layer.

[0008] Preferably, the multilayer composite paper body is formed by compounding a high-density material with a first paper layer, a second paper layer, and a nonwoven fabric as the main materials. The composite material provides the paper's texture and the nonwoven fabric's moisture-reinforcement properties, while being lower in cost than a nonwoven fabric wiping cloth, significantly improving the practicality of the multilayer composite paper body. The hydrophilic layer inside the nonwoven fabric improves the hydrophilic texture of the multilayer composite paper body, the reinforcing layer inside improves the overall toughness and practicality of the multilayer composite paper body, and the antibacterial layer improves the bacteriostatic effect of the multilayer composite paper body.

[0009] Preferably, a nonwoven fabric is attached to the end of the hydrophilic layer that is separated from the reinforcing layer, and the first fabric surface is attached to the surface of the nonwoven fabric.

[0010] Preferably, a high-density surface layer is bonded to the other end of the antibacterial layer that is separated from the reinforcing layer, and a second fabric surface is bonded to the surface of the high-density surface layer.

[0011] Preferably, an adhesive layer is provided between each layer of the first paper layer, the nonwoven fabric, and the second paper layer, and the layers of the first paper layer, the nonwoven fabric, and the second paper layer are all adhered to each other via the adhesive layer.

[0012] Preferably, a wiping layer is provided on both the surface of the first paper layer and the second paper layer, and the reinforcing layer is made of PBO fiber material.

[0013] Preferably, a water-retaining layer is installed between the nonwoven fabric and the hydrophilic layer.

[0014] Preferably, the first paper layer, the paper core, and the second paper layer are bonded together to form a multilayer composite paper body, the material of which has a thickness of 0.28 to 0.80 mm and a basis weight range of 45 gsm to 95 gsm. [Effects of the Invention]

[0015] Beneficial effects of this invention:

[0016] This multilayer composite paper is formed by compounding a high-density material with the first and second paper layers and paper core as the main materials within the multilayer composite paper body. The composite material provides the paper-like texture and the wet-reinforcement properties of nonwoven fabric, while being less expensive than nonwoven fabric wiping cloths, significantly improving the practicality of the multilayer composite paper body. The hydrophilic layer enhances the hydrophilic texture of the multilayer composite paper body, and the internal reinforcing layer improves the overall toughness and practical effectiveness of the multilayer composite paper body. In addition, the antibacterial layer improves the bacteriostatic effect of the multilayer composite paper body. The paper selected for this multilayer composite paper body is a wiping paper with a basis weight of 13-25 gsm, a thickness of 0.10-0.15 mm, a 100% pulp composition, and an air permeability of 200-400 L / m² / s. The nonwoven fabric is either an air-through nonwoven fabric or a two-component polypropylene spunbond nonwoven fabric, with a basis weight range of 15-25 gsm and a thickness of 0.15-0.45 mm. The fiber material of the nonwoven fabric is 100% PE / PET or 100% PP, with an air permeability of 2500-3500 L / m² / s and a tensile elongation at break of 60%-300%. The nonwoven fabric has a certain elastic shrinkage, and the composite contributes to the bulkiness and flexibility of the product. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic diagram of the perspective structure of the multilayer composite paper of the present invention. [Figure 2] This is a schematic perspective view of the internal material structure of the multilayer composite paper of the present invention. [Figure 3] This is a schematic diagram of the planar structure of the internal material of the multilayer composite paper of the present invention. [Figure 4] This is a schematic diagram of the local cross-sectional structure of the internal material of the nonwoven fabric of the present invention. [Modes for carrying out the invention]

[0018] The present invention will be further explained below, linking the drawings with examples.

[0019] Referring to Figures 1 to 4, the present invention provides one embodiment. The multilayer composite paper includes a first paper layer 2, a paper core 3 is laminated to the first paper layer 2, a second paper layer 4 is laminated to the paper core 3, a hydrophilic layer 6 is installed inside the paper core 3, a reinforcing layer 7 is laminated to the hydrophilic layer 6, and an antibacterial layer 8 is laminated to the reinforcing layer 7. This multilayer composite paper body 1 is formed by compounding a high-density material with the first paper layer 2, the second paper layer 4 and the paper core 3 as the main materials. The composite material provides a paper-like texture and moist reinforcement for the paper core 3, while also being cheaper than the wiping cloth for the paper core 3, significantly improving the practicality of the multilayer composite paper body 1.

[0020] Referring to Figures 2 to 4, in this embodiment, a nonwoven fabric 5 is attached to the end of the hydrophilic layer 6 away from the reinforcing layer 7, and a first fabric surface is attached to the surface of the nonwoven fabric 5. A high-density surface layer 9 is attached to the other end of the antibacterial layer 8 away from the reinforcing layer 7, and a second fabric surface is attached to the surface of the high-density surface layer 9. Adhesive layers are placed between each of the layers: the first paper layer 2, the paper core 3, and the second paper layer 4. The layers of the first paper layer 2, the paper core 3, and the second paper layer 4 are all bonded together via adhesive layers. This multilayer composite paper body 1 is formed by compounding a high-density material with the first paper layer 2, the second paper layer 4, and the paper core 3 as the main materials. The composite material provides the paper-like texture and the wet-reinforcement properties of the nonwoven fabric 5, while the cost of the nonwoven fabric 5 is lower than that of a wiping cloth, significantly improving the practicality of the multilayer composite paper body 1.

[0021] Referring to Figures 2 to 4, in this embodiment, a wiping layer is provided on the surface of both the first paper layer 2 and the second paper layer 4, the reinforcing layer 7 is made of PBO fiber material, a water-retaining layer is provided between the nonwoven fabric 5 and the hydrophilic layer 6, the material of the multilayer composite paper body 1 has a thickness of 0.28 to 0.80 mm and a basis weight range of 45 gsm to 95 gsm, the hydrophilic layer 6 improves the hydrophilic feel of the multilayer composite paper body 1, the reinforcing layer 7 inside improves the toughness and practical effect of the entire multilayer composite paper body 1, and the antibacterial layer 8 improves the bacteriostatic effect of the multilayer composite paper body 1.

[0022] When it operates, it is formed by performing the composite of high-density materials mainly using the first paper layer 2, the second paper layer 4 and the paper core 3 inside the multi-layer composite paper body 1. The composite material has the skin-friendliness of paper and the wet strengthening property of the non-woven fabric 5, and is lower than the cost of the wiping cloth of the non-woven fabric 5, greatly improving the practicality of the multi-layer composite paper body 1. The hydrophilic layer 6 improves the hydrophilic skin-friendliness of the multi-layer composite paper body 1, and the reinforcing layer 7 inside it improves the toughness and practical effect of the whole multi-layer composite paper body 1, and the antibacterial layer 8 can improve the bacteriostatic effect of the multi-layer composite paper body 1.

[0023] By the above steps, it is formed by performing the composite of high-density materials mainly using the first paper layer 2, the second paper layer 4 and the paper core 3 inside the multi-layer composite paper body 1. The composite material has the skin-friendliness of paper and the wet strengthening property of the non-woven fabric 5, solving the problems that the conventional composite paper has no skin-friendliness after production, relatively low humidity and high cost.

Description of Reference Numerals

[0024] 1. Multi-layer composite paper body; 2. First paper layer; 3. Paper core; 4. Second paper layer; 5. Non-woven fabric; 6. Hydrophilic layer; 7. Reinforcing layer; 8. Antibacterial layer; 9. High-density surface layer.

Claims

1. A multilayer composite paper comprising a first paper layer (2), wherein a paper core (3) is laminated to the first paper layer (2), a second paper layer (4) is laminated to the paper core (3), a hydrophilic layer (6) is installed inside the paper core (3), a reinforcing layer (7) is laminated to the hydrophilic layer (6), and an antibacterial layer (8) is laminated to the reinforcing layer (7).

2. The multilayer composite paper according to claim 1, characterized in that a nonwoven fabric (5) is attached to the end of the hydrophilic layer (6) that is separated from the reinforcing layer (7), and a first fabric surface is attached to the surface of the nonwoven fabric (5).

3. The multilayer composite paper according to claim 1, characterized in that a high-density surface layer (9) is bonded to the other end of the antibacterial layer (8) that is separated from the reinforcing layer (7), and a second fabric surface is bonded to the surface of the high-density surface layer (9).

4. The multilayer composite paper according to claim 1, characterized in that an adhesive layer is provided between each of the layers of the first paper layer (2), the paper core (3), and the second paper layer (4), and the layers of the first paper layer (2), the paper core (3), and the second paper layer (4) are all adhered to each other via the adhesive layer.

5. The multilayer composite paper according to claim 1, characterized in that a wiping layer is provided on the surface of both the first paper layer (2) and the second paper layer (4).

6. The multilayer composite paper according to claim 1, characterized in that a water-retaining layer is installed between the nonwoven fabric (5) and the hydrophilic layer (6).

7. The multilayer composite paper according to claim 1, characterized in that the first paper layer (2), the paper core (3), and the second paper layer (4) are adhered together to form a multilayer composite paper body (1), and the material of the multilayer composite paper body (1) has a thickness of 0.28 to 0.80 mm and a basis weight range of 45 gsm to 95 gsm.

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