One-way moisture-conducting non-woven fabric and preparation method thereof

Abstract

The invention relates to the technical field of water absorbing materials, and particularly discloses a one-way moisture conducting non-woven fabric which is formed by mixing and spinning a raw material I and a raw material II, and the mixing proportion of the raw material I and the raw material II is evenly increased in the thickness direction of the non-woven fabric. By changing the change rule of the raw material I and the raw material II, the mixing proportion of the raw material I and the raw material II is uniformly increased in the thickness direction, the one-way moisture guiding effect is achieved, and therefore the one-way moisture guiding function of the non-woven fabric is achieved. The invention further discloses a preparation method of the one-way moisture-conducting non-woven fabric.

Description

Technical Field

[0001] The invention relates to the technical field of water-absorbing materials, in particular to a unidirectional moisture-conducting nonwoven fabric and a preparation method thereof. Background Art

[0002] Unidirectional moisture-conducting nonwovens play an important role in the surface layer and top layer of sanitary products. Unidirectional moisture-conducting textiles mean that water can only be transferred from one side of the fabric to the other side, but not vice versa, and the transfer is directional. Unidirectional moisture-conducting fabrics can transfer sweat from the inner layer of the fabric that contacts the skin to the outer layer of the fabric in one direction, and evaporate quickly on the outer layer of the fabric, and the sweat on the outer layer will not seep back into the inner layer of the fabric, thereby keeping the skin dry and maintaining the moisture and heat balance of the microenvironment between the fabric and the human skin.

[0003] At present, there are usually two principles for achieving unidirectional moisture conduction: differential capillary effect and wetting gradient effect. The so-called wetting gradient effect refers to the different hydrophilicity and hydrophobicity on both sides of the fabric, which generates an additional pressure difference from the hydrophobic layer to the hydrophilic layer in the thickness direction of the fabric. The water is affected by the additional pressure difference to achieve a unidirectional moisture conduction effect. The wetting gradient effect is used to achieve unidirectional moisture conduction performance of the fabric, which can be partially achieved on woven fabrics and knitted fabrics through fabric structure design. In recent years, some scholars have used electrospinning to prepare non-woven fabrics with unidirectional moisture conduction function, but there are relatively few studies that use traditional non-woven methods such as needle punching or hydroentanglement to achieve the unidirectional moisture conduction function of non-woven fabrics by changing the fabric structure. Summary of the invention

[0004] In order to solve the problem that the nonwoven fabrics in the prior art currently have relatively little unidirectional moisture conduction function, the present invention provides a unidirectional moisture conduction nonwoven fabric and a preparation method thereof.

[0005] The technical solution adopted by the present invention is:

[0006] A unidirectional moisture-conducting nonwoven fabric is prepared by mixing raw materials I and II. The mixing ratio of raw materials I and II increases uniformly along the thickness direction of the nonwoven fabric.

[0007] Preferably, the mixing ratio of the raw material I and the raw material II is uniformly changed from 1:4 to 1:N, wherein 1≤N<4.

[0008] Preferably, the raw material I is viscose fiber, and the raw material II is polyester fiber.

[0009] Preferably, along the length direction of the nonwoven fabric, the mixing ratio of the raw material I and the raw material II changes regularly and continuously.

[0010] A method for preparing a unidirectional moisture-conducting nonwoven fabric comprises the following steps:

[0011] S1. Combing raw materials I and II and pre-treating them by dispersion and spreading to ensure that raw materials I and II are evenly distributed and suitable for the subsequent web laying process;

[0012] S2, feeding the pretreated fiber mixture into a web laying machine, performing a multi-layer web laying operation, gradually changing the mixing ratio of raw material I and raw material II according to a predetermined level, so that the mixing ratio of raw material I and raw material II changes regularly in a step-by-step manner in the thickness direction, so as to achieve a unidirectional moisture conduction effect;

[0013] S3. After the web is laid, the multi-layer fiber structure is formed and fixed together.

[0014] Preferably, in step S2, the mixing ratio of raw material I and raw material II is uniformly changed from 1:4 to 1:N, wherein 1≤N<4.

[0015] Preferably, the raw material I is viscose fiber, and the raw material II is polyester fiber.

[0016] Preferably, in step S2, by repeatedly laying the net and adjusting the laying direction, the mixing ratio of raw material I and raw material II is changed regularly in the horizontal direction, so as to achieve a unidirectional moisture conduction effect.

[0017] The beneficial effects of the present invention are:

[0018] By changing the changing rules of raw materials I and II, the mixing ratio of raw materials I and II is uniformly increased in the thickness direction to achieve a unidirectional moisture conduction effect, thereby realizing the unidirectional moisture conduction function of the nonwoven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the cross-sectional structure of a unidirectional moisture-conducting nonwoven fabric in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of a device for realizing a unidirectional moisture-conducting nonwoven fabric in an embodiment of the present invention;

[0021] Figure numerals: 1. Cotton bin group I, 2. Cotton bin group II, 3. Feeding pipe I, 4. Feeding pipe II, 5. Output roller I, 6. Output roller II, 7. Beater, 8. Cotton mixing channel, 9. Output pipe, 10. Feeding cotton amount control device I, 11. Feeding cotton amount control device II, 12. Output cotton amount control device I, 13. Output cotton amount control device II. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] A unidirectional moisture-conducting nonwoven fabric is prepared by mixing raw materials I and II. The mixing ratio of raw materials I and II increases uniformly along the thickness direction of the nonwoven fabric.

[0025] By changing the changing rules of raw materials I and II, the mixing ratio of raw materials I and II is uniformly increased in the thickness direction to achieve a unidirectional moisture conduction effect, thereby realizing the unidirectional moisture conduction function of the nonwoven fabric.

[0026] Specifically, the mixing ratio of the raw material I and the raw material II is uniformly changed from 1:4 to 1:N, where 1≤N<4, for example, it is divided into 8 layers, such as Figure 1 As shown, from bottom to top, in the first layer, the mixing ratio of raw material I and raw material II is 1:4, in the second layer, the mixing ratio of raw material I and raw material II is 1:3.6, in the third layer, the mixing ratio of raw material I and raw material II is 1:3.2, in the fourth layer, the mixing ratio of raw material I and raw material II is 1:2.8, in the fifth layer, the mixing ratio of raw material I and raw material II is 1:2.4, in the sixth layer, the mixing ratio of raw material I and raw material II is 1:2, in the seventh layer, the mixing ratio of raw material I and raw material II is 1:1.6, and in the third layer, the mixing ratio of raw material I and raw material II is 1:1.2.

[0027] Specifically, the raw material I is viscose fiber, and the raw material II is polyester fiber.

[0028] Specifically, along the length direction of the nonwoven fabric, the mixing ratio of the raw material I and the raw material II changes regularly.

[0029] By changing the changing rules of raw materials I and II, nonwoven fabrics with different moisture conduction effects can be obtained; when the mixing ratio of raw materials I and II changes stepwise, the obtained nonwoven fabric has a unidirectional moisture conduction effect only along the thickness direction; when the regularity of raw materials I and II changes continuously, under the action of repeated laying of the web by the web laying machine, the obtained nonwoven fabric has a unidirectional moisture conduction effect not only along the thickness direction, but also along the length direction. The unidirectional moisture conduction nonwoven fabric of the present invention can also be combined with relevant technologies related to antibacterial nonwoven materials for air filtration to realize the application of unidirectional moisture conduction nonwoven fabrics in disposable sanitary products and improve the comfort of the products.

[0030] Example 2

[0031] A method for preparing a unidirectional moisture-conducting nonwoven fabric comprises the following steps:

[0032] S1. Combing raw materials I and II and pre-treating them by dispersion and spreading to ensure that raw materials I and II are evenly distributed and suitable for the subsequent web laying process;

[0033] S2, feeding the pretreated fiber mixture into a web laying machine, performing a multi-layer web laying operation, gradually changing the mixing ratio of raw material I and raw material II according to a predetermined level, so that the mixing ratio of raw material I and raw material II changes regularly in a step-by-step manner in the thickness direction, so as to achieve a unidirectional moisture conduction effect;

[0034] S3. After the web is laid, the multi-layer fiber structure is formed and fixed together.

[0035] Specifically, in step S2, the mixing ratio of the raw material I and the raw material II is uniformly changed from 1:4 to 1:N, wherein 1≤N<4.

[0036] Specifically, the raw material I is viscose fiber, and the raw material II is polyester fiber.

[0037] Specifically, in step S2, by repeatedly laying the net and adjusting the laying direction, the mixing ratio of raw material I and raw material II changes regularly in the horizontal direction, thereby achieving a unidirectional moisture conduction effect.

[0038] The thickness of the nonwoven fabric prepared by the preparation method can be controlled within the range of 3 mm to 5 mm.

[0039] Example 3

[0040] In order to realize the practical application of the nonwoven fabric of the present invention, this embodiment also provides the following process.

[0041] Step 1: Setting the mixing ratio of raw material I and raw material II.

[0042] The mixing ratio of raw material I and raw material II is set so that it shows regular step-by-step changes or regular continuous changes during the web laying process.

[0043] Regular step-by-step changes: The mixing ratio of raw material I and raw material II is gradually changed according to a predetermined level, so that the material forms a layered structure in the thickness direction to achieve a unidirectional moisture conduction effect.

[0044] Regularity changes continuously: The ratio of raw material I and raw material II is set to change according to a certain regularity to ensure that different combination structures are formed in the length and thickness directions of the material.

[0045] Step 2: Pretreatment of materials.

[0046] Raw materials I and II are dispersed and spread by mechanical combing or airflow combing to ensure that the fibers are evenly distributed and suitable for the subsequent web laying process.

[0047] Step 3: Net laying process.

[0048] The pre-treated fiber mixture is fed into the web laying machine for multi-layer web laying operation:

[0049] During the multiple laying processes, the arrangement order of the web layers of the laying machine is set so that the fibers are distributed in different directions, ensuring that the final nonwoven fabric has a unidirectional moisture conduction effect in the thickness direction;

[0050] By repeatedly laying the mesh and adjusting the laying direction, a unidirectional moisture-conducting channel is further formed in the length direction.

[0051] Step 4: Compacting and molding.

[0052] After laying, the multi-layer fiber structure is fixed together by heat pressing, needling or other forming methods:

[0053] The hot pressing temperature and pressure can be adjusted as needed to ensure that the thickness and density of the nonwoven fabric meet the design requirements and maintain the continuity of the moisture conduction channel.

[0054] Step 5: Post-processing and antibacterial function enhancement.

[0055] The formed nonwoven fabric is treated with antibacterial agents by dipping, spraying or embedding antibacterial agents to improve its antibacterial properties.

[0056] This step can be combined with the antimicrobial technology in the air filtration material to ensure that the material has an effective antimicrobial effect and improves hygiene performance.

[0057] Step 6: Collection and subsequent processing of products.

[0058] The final product is rolled or cut into specific sizes and packaged for use in disposable hygiene products such as sanitary napkins, diapers, etc.

[0059] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A unidirectional moisture-conducting nonwoven fabric, characterized in that: The nonwoven fabric is spun by mixing raw material I and raw material II. Along the thickness direction of the nonwoven fabric, the mixing ratio of raw material I and raw material II increases uniformly.

2. The unidirectional moisture-conducting nonwoven fabric according to claim 1, characterized in that: The mixing ratio of the raw material I and the raw material II is uniformly changed from 1:4 to 1:N, wherein 1≤N<4.

3. The unidirectional moisture-conducting nonwoven fabric according to claim 2, characterized in that: The raw material I is viscose fiber, and the raw material II is polyester fiber.

4. The unidirectional moisture-conducting nonwoven fabric according to claim 3, characterized in that: Along the length direction of the nonwoven fabric, the mixing ratio of the raw material I and the raw material II changes regularly and continuously.

5. A method for preparing a unidirectional moisture-conducting nonwoven fabric, characterized in that: The steps include: S1. Combing raw materials I and II and pre-treating them by dispersion and spreading to ensure that raw materials I and II are evenly distributed and suitable for the subsequent web laying process; S2, feeding the pretreated fiber mixture into a web laying machine, performing a multi-layer web laying operation, gradually changing the mixing ratio of raw material I and raw material II according to a predetermined level, so that the mixing ratio of raw material I and raw material II changes regularly in a step-by-step manner in the thickness direction, so as to achieve a unidirectional moisture conduction effect; S3. After the web is laid, the multi-layer fiber structure is formed and fixed together.

6. The method for preparing the unidirectional moisture-conducting nonwoven fabric according to claim 5, characterized in that: In step S2, the mixing ratio of the raw material I and the raw material II is uniformly changed from 1:4 to 1:N, wherein 1≤N<4.

7. The method for preparing the unidirectional moisture-conducting nonwoven fabric according to claim 6, characterized in that: The raw material I is viscose fiber, and the raw material II is polyester fiber.

8. The method for preparing the unidirectional moisture-conducting nonwoven fabric according to claim 7, characterized in that: In step S2, by repeatedly laying the net and adjusting the laying direction, the mixing ratio of raw material I and raw material II changes regularly in the horizontal direction, thereby achieving a unidirectional moisture conduction effect.

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