Recycled degradable environment-friendly ink-absorbing needle-punched nonwoven fabric

Abstract

This utility model provides a recyclable, biodegradable, and environmentally friendly ink-absorbing needle-punched nonwoven fabric, relating to the field of nonwoven fabric technology. It includes: a nonwoven fabric body; the nonwoven fabric body has a three-layer composite structure, with an upper dense surface layer and a lower dense surface layer, and a middle loose support skeleton. Both the upper and lower dense surface layers are composed of fibers with a diameter of 2 micrometers. A nanofiber cellulose film with a thickness of 8 micrometers is laminated to the surface of the nonwoven fabric body. The nonwoven fabric body has a three-layer composite structure, with upper and lower polylactic acid dense layers (2 micrometers in diameter, each accounting for 20% of the total thickness) controlling ink diffusion and improving strength, and a middle loose support skeleton (6 micrometers in diameter, accounting for 60%, with a porosity of 75%) storing and penetrating ink. The three-dimensional structure is formed by needle punching at 200 needles / cm². The film contains 3% titanium dioxide for UV resistance. Both polylactic acid and nanofiber cellulose are biodegradable materials, suitable for printing, medical, and packaging fields, balancing environmental friendliness, printing performance, and functionality.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric technology, and in particular to a recyclable, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric. Background Technology

[0002] In today's global trend of advocating green development, the environmental transformation of traditional industrial materials has become inevitable. Ink-absorbing nonwoven fabric, a commonly used material in packaging printing, advertising production, and office supplies, has a wide range of applications, including product label printing, outdoor advertising banners, and disposable printed products. This utility model is a recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric.

[0003] Existing nonwoven ink absorbent fabrics are mostly made of petroleum-based synthetic fibers such as polypropylene and polyester, which are difficult to degrade in the natural environment. Their use will cause serious "white pollution", which does not conform to the current green development concept and environmental protection policy requirements. In addition, the surface structure is not dense enough, making it impossible to accurately control ink diffusion, resulting in blurry printed patterns, low color saturation, and difficulty in presenting high-quality printing effects. Utility Model Content

[0004] This disclosure relates to a recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric to solve the technical problems mentioned in the background art.

[0005] In a first aspect, this disclosure provides a recyclable, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric, specifically comprising: a nonwoven fabric body; the nonwoven fabric body has a three-layer composite structure, with an upper dense surface layer and a lower dense surface layer, and a middle layer being a loose support skeleton. The upper and lower dense surface layers are both composed of fibers with a diameter of 2 micrometers, and the loose support skeleton of the middle layer is composed of fibers with a diameter of 6 micrometers. A nanocellulose film with a thickness of 8 micrometers is laminated to the surface of the nonwoven fabric body. The nanocellulose film is attached to the surface of the nonwoven fabric through a dip-coating and drying process. The surface roughness Ra value of the nanocellulose film surface is 0.8 micrometers to enhance the contact area and adhesion between the ink and the nonwoven fabric surface.

[0006] In at least some embodiments, the thickness of both the upper dense surface layer and the lower dense surface layer accounts for 20% of the total thickness of the nonwoven fabric body.

[0007] In at least some embodiments, the thickness of the loose support skeleton accounts for 60% of the total thickness of the nonwoven fabric body.

[0008] In at least some embodiments, both the upper dense surface layer and the lower dense surface layer are composed of polylactic acid fibers.

[0009] In at least some embodiments, the porosity of the loose support skeleton is 75% and the average pore size is 15 micrometers, ensuring good ink storage space and ink penetration performance.

[0010] In at least some embodiments, the nanocellulose film contains 3% by mass of titanium dioxide nanoparticles to enhance the nonwoven fabric's protection against ultraviolet rays and prevent the printed pattern from fading.

[0011] In at least some embodiments, the upper dense surface layer, the lower dense surface layer, and the loose support skeleton are formed into a three-dimensional interwoven structure by a needle punching process, with a needle punching density of 200 needles / cm².

[0012] This invention provides a recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric, which has the following beneficial effects:

[0013] In this invention, a nanofiber cellulose film with a thickness of 8 micrometers is laminated on the surface of the nonwoven fabric body. The surface roughness of the nanofiber cellulose film is Ra=0.8 micrometers. By increasing the surface area, the physical adsorption between ink and nonwoven fabric is enhanced, reducing ink splashing or falling off during printing and improving the durability of the pattern. The nanofiber cellulose film is attached by a simple dip coating process, without the need for complex equipment, with low production cost, suitable for mass production, and can be quickly applied to industries such as printing, medical, and packaging.

[0014] Furthermore, in this invention, the upper and lower dense surface layers (polylactic acid fiber, 2 micrometers in diameter) form a smooth and flat surface, which can precisely control ink diffusion, improve printing clarity and color saturation, and enhance the wear resistance and tear resistance of the nonwoven fabric; the middle loose support skeleton (6-micrometer diameter fiber, 75% porosity, and 15-micrometer average pore size) provides ample ink storage space, ensuring rapid ink penetration and uniform distribution, avoiding smudging, and giving the material lightweight and flexibility; the three layers form a three-dimensional interwoven structure through a needle punching process (200 needles / cm²), which enhances the interlayer bonding force, prevents delamination, and improves the overall mechanical strength.

[0015] In addition, in this invention, 3% titanium dioxide nanoparticles are added to the nanocellulose film, which can absorb or reflect ultraviolet rays, inhibit the fading of printed patterns due to light exposure, and extend the preservation time of the content.

[0016] Furthermore, in this invention, both polylactic acid fiber and nanocellulose are bio-based biodegradable materials that can decompose in the natural environment after disposal, thus avoiding white pollution and meeting environmental protection policy requirements. They are suitable for fields such as environmentally friendly packaging and disposable printed products.

[0017] In addition, in this invention, the upper and lower dense layers each account for 20% of the total thickness, taking into account both surface performance and structural support, while the loose support skeleton accounts for 60%, maximizing ink storage space and breathability and moisture permeability, which is suitable for the functional requirements of printing consumables. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0020] In the attached diagram:

[0021] Figure 1 A schematic diagram of the overall structure of this application is shown.

[0022] Figure 2 A cross-sectional structural schematic diagram of the nonwoven fabric body of this application is shown.

[0023] Figure 3 This application shows Figure 2 A magnified structural diagram of part A in the middle.

[0024] List of reference numerals

[0025] 1. Nonwoven fabric body; 2. Upper dense surface layer; 3. Lower dense surface layer; 4. Loose supporting skeleton; 5. Nanocellulose film. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Please refer to Figures 1 to 3 Example 1:

[0028] This invention proposes a recyclable, biodegradable, and environmentally friendly ink-absorbing needle-punched nonwoven fabric, comprising: a nonwoven fabric body 1; the nonwoven fabric body 1 has a three-layer composite structure, with an upper dense surface layer 2 and a lower dense surface layer 3, and a middle layer of loose support skeleton 4. The upper dense surface layer 2 and the lower dense surface layer 3 are both composed of fibers with a diameter of 2 micrometers, and the loose support skeleton 4 of the middle layer is composed of fibers with a diameter of 6 micrometers. A nanocellulose film 5 with a thickness of 8 micrometers is laminated on the surface of the nonwoven fabric body 1. The nanocellulose film 5 is attached to the surface of the nonwoven fabric through dip coating and drying processes. The surface roughness Ra value of the nanocellulose film 5 is 0.8 micrometers to enhance the contact area and adhesion between the ink and the surface of the nonwoven fabric.

[0029] In this embodiment, the thickness of both the upper dense surface layer 2 and the lower dense surface layer 3 accounts for 20% of the total thickness of the nonwoven fabric body 1, and the thickness of the loose support skeleton 4 accounts for 60% of the total thickness of the nonwoven fabric body 1. Their functions are as follows: the upper dense surface layer 2 and the lower dense surface layer 3, each accounting for 20% of the total thickness of the nonwoven fabric body 1, can form a stable and dense surface structure. This structure can precisely control ink diffusion, improve printing clarity and color saturation, and enhance the wear resistance and tear resistance of the nonwoven fabric. The loose support skeleton 4, accounting for 60% of the total thickness of the nonwoven fabric body 1, can provide sufficient internal space. Its high porosity (75%) and suitable average pore size (15 micrometers) can ensure rapid ink penetration and uniform distribution, avoid smudging, and at the same time give the material lightweight and flexibility.

[0030] In this embodiment, both the upper dense surface layer 2 and the lower dense surface layer 3 are made of polylactic acid (PLA) fiber. PLA fiber is a biodegradable material, and its use in the upper and lower dense surface layers 2 and 3 allows the nonwoven fabric to decompose naturally after disposal, complying with environmental protection policies and effectively reducing white pollution. It is suitable for packaging, disposable products, and other fields with high environmental requirements. PLA fiber possesses certain strength and toughness, giving the upper and lower dense surface layers 2 and 3 good wear resistance and tear resistance, protecting the surface of the nonwoven fabric from easy damage during use and maintaining the integrity of the printed pattern. Furthermore, PLA fiber is chemically stable and does not easily react with inks or other substances, ensuring structural stability of the upper and lower dense surface layers 2 and 3 during printing, ensuring precise control of ink diffusion, and improving print clarity and color saturation.

[0031] In this embodiment, the porosity of the loose support skeleton 4 is 75%, and the average pore size is 15 micrometers, ensuring good ink storage space and ink penetration performance.

[0032] In Example 2, based on Example 1, 3% by mass of titanium dioxide nanoparticles were added to the nanocellulose film 5 to enhance the UV protection performance of the nonwoven fabric and prevent the printed pattern from fading. The function is as follows: Titanium dioxide nanoparticles have excellent UV absorption and scattering capabilities. The addition of 3% by mass can form a highly efficient protective layer on the surface and inside of the nanocellulose film 5. When UV rays irradiate the surface of the nonwoven fabric, the titanium dioxide nanoparticles can absorb the UV energy and convert it into heat energy or harmless low-energy radiation release, effectively reducing the damage of UV rays to the printed pattern and preventing the pigment from fading due to photo-oxidation and other reactions.

[0033] In Example 3, based on Examples 1 and 2, a three-dimensional interwoven structure is formed between the upper dense surface layer 2, the lower dense surface layer 3, and the loose support skeleton 4 through a needle punching process. The needle punching density is 200 needles / cm². The purpose of this process is to form a tight three-dimensional interwoven structure between the upper dense surface layer 2, the lower dense surface layer 3, and the loose support skeleton 4 through the needle punching process of 200 needles / cm², so that the fibers of each layer are entangled with each other, effectively preventing the nonwoven fabric from delaminating during use and ensuring the overall structural stability.

[0034] The working principle of this embodiment is as follows: When ink comes into contact with the nonwoven fabric body 1, the loose supporting skeleton 4, with its high porosity of 75% and average pore size of 15 micrometers, provides ample ink storage space and good penetration channels, allowing the ink to quickly and evenly penetrate into the interior of the nonwoven fabric. Simultaneously, the upper dense surface layer 2 and the lower dense surface layer 3 restrict excessive lateral diffusion of the ink, ensuring efficient vertical ink transfer and preventing smudging. The nanofiber cellulose film 5 on the surface of the nonwoven fabric body 1 has a surface roughness Ra value of 0.8 micrometers, effectively increasing the contact area with the ink and enhancing physical adsorption, allowing the ink to firmly adhere to the nonwoven fabric surface. Furthermore, the 3% by mass of titanium dioxide nanoparticles added to the film do not affect ink adhesion; instead, they synergize with the nanofiber cellulose to further enhance ink adhesion. The bonding stability between the upper dense surface layer 2, the lower dense surface layer 3, and the loose supporting skeleton 4 are formed by a needle punching process with a needle punching density of 200 needles / cm² to create a three-dimensional interwoven structure, which enhances the overall mechanical properties of the nonwoven fabric. This ensures that the structure does not deform or delaminate during ink penetration, maintaining the stability of the nonwoven fabric's shape. At the same time, the dense surface layer composed of polylactic acid fibers has good wear resistance and chemical stability, protecting the internal structure and making the ink adhesion performance last longer. Under light conditions, the titanium dioxide nanoparticles in the nanocellulose film 5 play a role in absorbing or reflecting ultraviolet rays, preventing ultraviolet rays from penetrating the film and damaging the internal ink and fiber structure. This prevents the printed pattern from fading or decomposing due to ultraviolet radiation, extends the pattern preservation time, and ensures that the printed content is clearly visible for a long time.

[0035] The following points should be noted in this article:

[0036] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0037] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric, comprising: The nonwoven fabric body (1) is characterized in that the nonwoven fabric body (1) is a three-layer composite structure, the upper and lower layers are an upper dense surface layer (2) and a lower dense surface layer (3) respectively, and the middle layer is a loose support skeleton (4). The upper dense surface layer (2) and the lower dense surface layer (3) are both composed of fibers with a diameter of 2 micrometers. The loose support skeleton (4) of the middle layer is composed of fibers with a diameter of 6 micrometers. The surface of the nonwoven fabric body (1) is coated with a nanocellulose film (5) with a thickness of 8 micrometers. The nanocellulose film (5) is attached to the surface of the nonwoven fabric by dip coating and drying process. The surface roughness Ra value of the nanocellulose film (5) is 0.8 micrometers to enhance the contact area and adhesion between the ink and the surface of the nonwoven fabric.

2. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 1, characterized in that, The thickness of both the upper dense surface layer (2) and the lower dense surface layer (3) accounts for 20% of the total thickness of the nonwoven fabric body (1).

3. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 1, characterized in that, The thickness of the loose support skeleton (4) accounts for 60% of the total thickness of the nonwoven fabric body (1).

4. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 2, characterized in that, Both the upper dense surface layer (2) and the lower dense surface layer (3) are made of polylactic acid fibers.

5. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 3, characterized in that, The porous support skeleton (4) has a porosity of 75% and an average pore size of 15 micrometers, ensuring good ink storage space and ink penetration performance.

6. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 1, characterized in that, The nanocellulose film (5) contains 3% by mass of titanium dioxide nanoparticles to enhance the nonwoven fabric's protection against ultraviolet rays and prevent the printed pattern from fading.

7. The recycled, biodegradable, environmentally friendly ink-absorbing needle-punched nonwoven fabric according to claim 4, characterized in that, The upper dense surface layer (2), the lower dense surface layer (3) and the loose support skeleton (4) form a three-dimensional interwoven structure through a needle punching process, with a needle punching density of 200 needles / cm².

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