Patterned non-woven material and preparation and application thereof

Abstract

The invention relates to a patterned non-woven material as well as preparation and application thereof, a fiber web is flatly laid on a web conveying curtain, and air thorn is performed to obtain the patterned non-woven material. According to the method, the air thorn parameters are accurately controlled, the problems of energy consumption and water resource consumption are solved, complex patterns with higher precision can be achieved, and the obvious innovation advantage is achieved.

Description

Technical Field

[0001] The invention belongs to the field of textiles, and in particular relates to a patterned nonwoven material and a preparation and application thereof. Background Art

[0002] As an important part of the modern textile industry, non-woven materials have extensive application value in medical care, environmental protection, geotechnical construction and other fields. Their industrial development is of great significance to the national economy and social needs.

[0003] The current mainstream spunlace nonwovens process relies on high-pressure water jets as an energy carrier, consuming at least 10 times the average daily output per hour. 95% of this water must be recycled, requiring a separate water treatment system. As a significant sector of the national economy, but one that consumes a significant amount of energy, the nonwovens industry urgently needs to seize development opportunities, develop new processes, and lead nonwovens technological innovation to contribute to the early achievement of carbon peak and carbon neutrality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a patterned nonwoven material and its preparation and application.

[0005] The present invention provides a method for preparing a patterned nonwoven material, comprising:

[0006] (1) Place the mold on the mesh curtain;

[0007] (2) The fiber web is spread flat on a mesh curtain and air-punched to obtain a patterned nonwoven material.

[0008] Preferably, the mold in step (1) is a patterned mold, and the mold thickness is greater than 0.2 mm, and further preferably has a thickness of 0.2-0.6 mm.

[0009] Preferably, in step (1), the mold is arranged on the mesh curtain, which includes: the mold is fixed on the mesh curtain and protrudes from the mesh curtain surface by more than 0.2 mm, and further, the protrusion from the mesh curtain surface by a height of 0.2-0.6 mm.

[0010] Preferably, the fiber web in step (2) is a hydrophilic fiber web, wherein the weight of the fiber web is 40-150 g / m 2 .

[0011] The gram weight of the fiber raw material is 40-150g / m 2 The fiber web of this weight usually has a more appropriate thickness and an appropriate amount of fiber content, which provides a larger contact area for the air needle. The effective area of the fiber web affected by the air needle is also larger, the effective entanglement increases, and the fiber web front is acted upon by the air needle to achieve a high efficiency.

[0012] Furthermore, the hydrophilic fiber is 100% viscose. This ensures the hydrophilicity of the raw material, resulting in a significant pre-wetting effect. Water molecules adhere to the fiber surface, forming hydrogen bonds with the fibers, while also promoting fiber swelling, increasing inter-fiber friction, and restricting lateral displacement of the fibers.

[0013] The hydrophilic fiber web is obtained by carding the hydrophilic fibers into a web.

[0014] Preferably, in step (2), the fiber web is pretreated; wherein the pretreatment is a wet treatment.

[0015] The purpose of the wetting treatment is to expel air from the web and impart a certain initial bonding strength between the fibers. Therefore, the web is pre-wetted with water. After pre-wetting, water molecules adhere to the surface and interior of the fibers, forming hydrogen bonds with them. Simultaneously, the water causes the fibers to swell, increasing friction between them and limiting their lateral movement.

[0016] Preferably, in step (2), the fiber web is laid flat on the mesh curtain, which is: the fiber web is laid flat on the mesh curtain provided with a mold side.

[0017] Preferably, the air puncture process parameters in step (2) are as follows: the negative pressure suction device is turned on, the negative pressure is 85000Pa-95000Pa, the air puncture distance is 1-10mm, the air puncture pressure is constant at 0.15-10MPa, when the high-pressure air needle does not contact the pattern area, the production speed is 2-5m / s, when it contacts the pattern area, it is 0.05-1.5m / s, and the number of air puncture paths is 1-10.

[0018] For example, the suction force of the suction port of the negative pressure suction device is 85000Pa-95000 Pa. When using the negative pressure suction device, in order to optimize the fiber web entanglement effect, it should be opened at the front end of the air thorn, closed when the high-pressure gas is entangled, and opened again at the tail end of the air thorn.

[0019] The air puncture distance is determined by the optical detection technique of Schlieren method.

[0020] The air thorns can be single-sided or double-sided.

[0021] The air puncture distance should be controlled within the effective air puncture distance of 1 cm. The closer the distance, the more concentrated the airflow energy, the tighter the fiber entanglement, the higher the breaking strength, but the lower the breaking elongation. Beyond the effective distance, the airflow energy decays, making it difficult to effectively entangle the fibers, resulting in a sharp drop in breaking strength and an increase in breaking elongation. Therefore, in actual production, the air puncture distance should be minimized to enhance the fiber entanglement effect.

[0022] The gas pressure range is 0.15-0.4MPa, which not only ensures that the fiber web can be fully entangled, but also protects the fiber web from damage, and also has the effect of tidying the fabric surface.

[0023] Increasing the number of air punctures can improve the breaking strength and entanglement coefficient of the product, but excessive air puncture will reduce product quality, so keeping it around 10 is the best. The number of air punctures should not exceed 10 to avoid excessive air pressure caused by too many air punctures, which may damage the fiber web.

[0024] The invention provides a patterned nonwoven material prepared by the method.

[0025] The present invention provides an application of the patterned nonwoven material in the fields of medical care, hygiene and clothing.

[0026] Beneficial effects

[0027] The present invention uses air spunlace to achieve efficient reinforcement and fine pattern production. The method of the present invention solves the environmental pressure and high energy consumption problems of traditional water spunlace technology, while having more flexible operation and scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The nonwoven material with a five-pointed star pattern and the web structure at the printing location obtained in Example 1;

[0029] Figure 2 The nonwoven material with a heart-shaped pattern obtained in Example 2;

[0030] Figure 3 The nonwoven material with a prismatic pattern obtained in Example 3;

[0031] Figure 4 This is the nonwoven material with a lion pattern obtained in Example 4. DETAILED DESCRIPTION

[0032] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0033] Tensile properties

[0034] The transverse and longitudinal breaking strength and elongation at break of air-spunlace nonwoven samples were tested using a YG026MB multifunctional electronic textile strength tester. Specimens were cut to 150 mm x 50 mm, with a clamping distance of 100 mm, a tensile speed of 100 mm / min, and a preload of 1 N. Each test consisted of five samples tested in each of the wet longitudinal and transverse directions. The breaking strength and elongation were recorded and averaged.

[0035] Example 1

[0036] (1) Fix the five-pointed star mold on the square hole plastic mesh curtain to ensure that there is no relative displacement between it and the mesh curtain during operation, and the height of the five-pointed star mold protruding from the mesh curtain is 0.2mm;

[0037] (2) Select 100% viscose raw material and obtain a gram weight of 120g / m2 by straight puncture laying 2 Fiber web;

[0038] (3) After pre-wetting, the fiber web is laid flat on the mesh curtain described in (1); during operation, the air puncture method adopts single-sided air puncture, the negative pressure suction device is turned on, the negative pressure is 85000Pa, the air puncture distance is 2mm, the air puncture pressure is constant at 0.4MPa, the production speed is 2.22m / s when the air puncture range does not touch the geometric pattern area, and 1.11m / s when it touches the geometric pattern area, and the number of air puncture passes is 5;

[0039] (4) After steps (1) to (3), the obtained air-punched nonwoven fabric has a five-pointed star replica pattern with a clear outline; the MD (longitudinal breaking strength of the nonwoven fabric) of the fiber web is tested to be 19N, the CD (transverse breaking strength of the nonwoven fabric) is 2.6N, and the elongation at break is 67.96%.

[0040] Example 2

[0041] (1) Fix the heart-shaped mold on the square hole plastic mesh curtain to ensure that there is no relative displacement between it and the mesh curtain during operation, and the height of the protrusion from the mesh curtain is 0.2mm;

[0042] (2) Select 100% viscose raw material and obtain a weight of 80g / m2 by straight puncture laying 2 Fiber web;

[0043] (3) After pre-wetting, the fiber web is laid flat on the mesh curtain described in (1); during operation, the air puncture method adopts single-sided air puncture, the negative pressure suction device is turned on, the negative pressure is 90000Pa, the air puncture distance is 2mm, the air puncture pressure is constant at 0.3MPa, the production speed is 2.22m / s when the air puncture range does not touch the geometric pattern area, and 1.11m / s when it touches the geometric pattern area, and the number of air puncture passes is 3;

[0044] (4) After steps (1) to (3), the obtained air-punched nonwoven fabric has a heart-shaped replica pattern with a clear outline; the MD (longitudinal breaking strength of the nonwoven fabric) of the fiber web is tested to be 15N, the CD (transverse breaking strength of the nonwoven fabric) is 2.4N, and the elongation at break is 71.15%.

[0045] Example 3

[0046] (1) Fix the diamond-shaped mold on the square hole plastic mesh curtain to ensure that there is no relative displacement between it and the mesh curtain during operation, and the height of the diamond-shaped mold protruding from the mesh curtain is 0.2mm;

[0047] (2) Select 100% viscose raw material and obtain a gram weight of 50g / m2 by straight puncture laying 2 Fiber web;

[0048] (3) After pre-wetting, the fiber web is laid flat on the mesh curtain described in (1); during operation, the air puncture method adopts single-sided air puncture, the negative pressure suction device is turned on, the negative pressure is 92000Pa, the air puncture distance is 2mm, the air puncture pressure is constant at 0.2MPa, the production speed is 2.22m / s when the air puncture range does not touch the geometric pattern area, and 1.11m / s when it touches the geometric pattern area, and the number of air puncture passes is 3;

[0049] (4) After steps (1) to (3), the obtained air-punched nonwoven fabric has a clearly defined diamond-shaped replica pattern; the MD (longitudinal breaking strength of the nonwoven fabric) of the fiber web is tested to be 11N, the CD (transverse breaking strength of the nonwoven fabric) is 1.9N, and the elongation at break is 69.84%.

[0050] Example 4

[0051] (1) Fix the lion mold on the square hole plastic mesh curtain to ensure that there is no relative displacement between it and the mesh curtain during operation, and the height of the lion mold protruding from the mesh curtain is 0.2mm;

[0052] (2) Select 100% viscose raw material and obtain a weight of 100g / m2 by straight puncture laying 2 Fiber web;

[0053] (3) After pre-wetting, the fiber web is laid flat on the mesh curtain described in (1); during operation, the air puncture method adopts single-sided air puncture, the negative pressure suction device is turned on, the negative pressure is 95000Pa, the air puncture distance is 2mm, the air puncture pressure is constant at 0.4MPa, the production speed is 2.22m / s when the air puncture range does not touch the geometric pattern area, and 1.11m / s when it touches the geometric pattern area, and the number of air puncture passes is 4;

[0054] (4) After steps (1) to (3), the obtained air-punched nonwoven fabric has a lion replica pattern with a clear outline; the MD (longitudinal breaking strength of the nonwoven fabric) of the fiber web is tested to be 16N, the CD (transverse breaking strength of the nonwoven fabric) is 2.3N, and the elongation at break is 65.2%.

Claims

1. A method for preparing a patterned nonwoven material, comprising: (1) Place the mold on the mesh curtain; (2) The fiber web is spread flat on a mesh curtain and air-punched to obtain a patterned nonwoven material.

2. The preparation method according to claim 1, characterized in that The mold in step (1) is a patterned mold, and the mold thickness is greater than 0.2 mm.

3. The preparation method according to claim 1, characterized in that: The step (1) of arranging the mold on the mesh curtain includes: the mold is fixed on the mesh curtain and protrudes from the mesh curtain surface by more than 0.2 mm.

4. The preparation method according to claim 1, characterized in that The fiber web in step (2) is a fiber web of hydrophilic fibers.

5. The preparation method according to claim 1, characterized in that: In the step (2), the fiber web is pretreated; The pretreatment is wet treatment.

6. The preparation method according to claim 1, characterized in that: In the step (2), the fiber web is laid flat on the mesh conveying curtain, which is as follows: the fiber web is laid flat on the mesh conveying curtain provided with a mold side.

7. The preparation method according to claim 1, characterized in that: The air puncture process parameters in the step (2) are as follows: the negative pressure suction device is turned on, the negative pressure is 85000Pa-95000 Pa, the air puncture distance is 1-10mm, the air puncture pressure is constant at 0.15-10MPa, when the air needle does not contact the pattern area, the production speed is 2-5m / s, when it contacts it is 0.05-1.5m / s, and the number of air puncture paths is 1-10.

8. A patterned nonwoven material prepared by the method of claim 1.

9. Use of the patterned nonwoven material according to claim 8 in the fields of clothing and medical care.

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