A wet-laid spunlace nonwoven fabric of fine denier cellulose fiber composite polyamide multifilament and a preparation method and application thereof

Abstract

The present application relates to the technical field of non-woven fabrics, and discloses a wet spunlace non-woven fabric of fine denier cellulose fiber composite polyamide multifilament and a preparation method and application thereof, the non-woven fabric comprising a polyamide multifilament layer and fine denier cellulose fiber layers arranged on the upper and lower layers of the polyamide multifilament layer; the polyamide multifilament layer is wound into a surrounding ring in a relaxed state in units of multifilament, and single multifilament is used to connect the surrounding rings in X-shaped lines between adjacent surrounding rings in the transverse direction, the surrounding ring is in the upper layer, and the X-shaped connection multifilament is in the lower layer, forming a double-layer skeleton structure. The polyamide multifilament is used as a skeleton material, more pore spaces are provided, fine denier cellulose fibers are laid on the upper and lower layers of the polyamide multifilament and are spunlaced with the polyamide multifilament, entanglement points are promoted to form, the composite strength between layers is increased, and the liquid absorption, liquid conductivity, liquid release and softness of the composite material are improved.

Description

Technical Field

[0001] This invention relates to the technical field of nonwoven fabrics, and in particular to a wet-laid spunlace nonwoven fabric of fine denier cellulose fiber composite nylon multifilament, its preparation method, and its application. Background Technology

[0002] Wet-laid spunlace nonwoven fabric is a sheet-like material made by wet-laying short fibers into a web, then spraying high-pressure micro-jet water onto one or more layers of the fiber web, causing the fibers to entangle together and thus strengthening the web to a certain strength. Finally, finishing processes can be used to improve the product's properties. Composite nonwoven fabric is a comprehensive material obtained by combining two or more nonwoven fabrics with different properties. It can integrate the advantages of each, thereby improving the defects of traditional nonwoven fabrics such as roughness, lint shedding, and poor liquid absorption and retention.

[0003] Chinese invention patent CN109576908B discloses a composite fabric of ultrafine denier viscose fiber and elastic mesh fabric and its preparation process. The composite fabric is made of a mesh fiber layer and a base fabric, with a mass ratio of mesh fiber layer to base fabric of 52:48. The mesh fiber layer is formed by wet processing of ultrafine denier viscose fiber slurry; the base fabric is an elastic mesh fabric. Chinese invention patent CN109605844B discloses a composite fabric of tansil fiber and elastic mesh fabric and its preparation method. The composite fabric is made of a mesh fiber layer and a base fabric, with a mass ratio of mesh fiber layer to base fabric of 53:47. The mesh fiber layer is formed by wet processing of tansil fiber slurry; the base fabric is an elastic mesh fabric. Both of these patents shift the first step of processing ultrafine viscose fiber / tansil fiber into dry paper to a wet papermaking process, accelerating the forming process. Combined with the hydroentangling composite process, this allows the two main raw material components to be fully bonded together.

[0004] However, the aforementioned patents all use hexagonal mesh elastic fabric, which is made of nylon monofilament twisted and spirally wound. The pore space is small, which is not only not conducive to the penetration and entanglement of ultrafine viscose fiber / tansil fiber, but also results in poor interlayer bonding and low strength. Furthermore, it leads to poor liquid absorption, liquid conduction and liquid release properties of the material. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a wet-laid spunlace nonwoven fabric composed of fine denier cellulose fibers and nylon multifilaments, along with its preparation method and applications. By employing a composite of fine denier cellulose fibers and nylon multifilaments, and improving the structure of the nylon multifilament layer to provide more pore space as a skeleton material, this not only facilitates the penetration and entanglement of the fine denier cellulose fibers, enhancing the entanglement and composite force, and improving the material's liquid absorption, conduction, and release properties, but also significantly improves the softness of the composite material, allowing for better skin adhesion, promoting skin absorption of liquids, and enhancing the efficacy of the essence.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a wet-spunlace nonwoven fabric composed of fine denier cellulose fiber composite nylon multifilament, the nonwoven fabric comprising a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer; the nonwoven fabric is made by wet-spunlace composite of the fine denier cellulose fiber layer, the nylon multifilament layer and the fine denier cellulose fiber layer in sequence; the nylon multifilament layer is formed by winding multifilaments in a relaxed state into enclosed loops, with adjacent enclosed loops connected by single strands of multifilament in an X-shaped pattern, the enclosed loops being on the upper layer and the X-shaped connecting multifilaments being on the lower layer, forming a double-layer skeleton structure.

[0008] This invention uses fine denier cellulose fiber as the main raw material, which is laid on the upper and lower layers of nylon multifilament and hydroentangled with it. This creates entanglement points between the fine denier cellulose fibers and between the fine denier cellulose fibers and the nylon multifilament, increasing the composite strength between layers and forming capillary channels for liquid conduction between the upper, middle and lower layers. This improves the liquid absorption rate and promotes the conduction of the essence.

[0009] The nylon multifilament layer, with its relaxed loop skeleton, not only enhances product strength, stabilizes dimensions, and reduces deformation, but also provides ample and uniform pores for the interlacing and displacement of fine denier cellulose fibers, allowing them to release more head hairs. When in contact with the skin, the double-layer skeleton structure, due to the difference in pore size formed by the surrounding loops and X-shaped connecting multifilaments, creates a structure with one large loop and one small loop. These loops structurally act as an anti-funnel, directionally conducting essence to the skin and locking in the essence flowing towards it, preventing backflow and evaporation, and improving the material's absorption, conduction, and release properties.

[0010] This invention uses nylon multifilament as the skeleton material, providing more porous space. This not only facilitates the penetration and entanglement of fine denier cellulose fibers, improving the entanglement and composite force, and enhancing the material's liquid absorption, conduction, and release properties, but also significantly improves the softness of the composite material, allowing for better skin adhesion, promoting skin absorption of liquids, and enhancing the efficacy of the essence. Compared to traditional wet-laid spunlace composite nonwoven fabrics, firstly, it effectively solves the problem of easy shedding in wet-laid composite materials; secondly, it provides more carriers for liquid absorption and conduction, with a certain directionality, improving the material's liquid absorption, conduction, and release properties; and thirdly, it overcomes the limitations of conventional composite materials in terms of insufficient softness. The finer nylon filaments and fibers greatly improve the softness of the composite material, allowing for better skin adhesion when used as a membrane.

[0011] Preferably, the shape of the enclosing ring is O-shaped, Ω-shaped, or rhomboid; a single enclosing ring is a double-layer structure formed independently by two strands of multifilament.

[0012] Preferably, in the double-layer skeleton structure, the area of ​​the holes in the upper layer formed by the surrounding ring is smaller than the area of ​​the holes in the lower layer formed by the X-shaped connecting multifilaments.

[0013] Due to the difference in the size of the pores formed by the surrounding rings and X-shaped connecting multifilaments, the nylon multifilament layer forms a structure with one large ring and one small ring. The large and small rings act as an anti-funnel in terms of structure, which can conduct the essence to the skin in a directional manner and lock the essence flowing to the skin, preventing the essence from flowing back and evaporating, and improving the material's liquid absorption, conduction and release properties.

[0014] Preferably, the multifilament is formed by combining 4 to 7 nylon monofilaments with a fineness of 18 to 23 μm in a parallel, relaxed state as a single strand; the fine denier cellulose fiber has a fineness of 0.3 to 0.9 dtex.

[0015] Preferably, the nonwoven fabric has a unit area mass of 25–90 g / m². 2 Its raw materials include 12-75% nylon multifilament and 25-88% fine denier cellulose fiber by mass.

[0016] Preferably, the fine denier cellulose fiber is one or more of viscose fiber, Lyocell fiber, and Modal fiber.

[0017] Secondly, the present invention also provides a method for preparing a wet-laid spunlace nonwoven fabric composed of fine denier cellulose fibers and nylon multifilaments, comprising the following steps:

[0018] (1) Fine denier cellulose fiber layer: The fine denier cellulose fiber suspension is fed into the inclined wire forming machine, dehydrated and formed into a fine denier cellulose fiber layer.

[0019] (2) Nylon multifilament layer: Nylon monofilaments are combined into a single strand in a relaxed state to form a multifilament, and then the multifilament is wound into a loop in a relaxed state to form a nylon multifilament layer.

[0020] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0021] (4) First hydroentangled composite: The two layers of materials are introduced onto the hydroentangled flat screen, and the hydroentangled process is used to perform 3 to 5 hydroentanglements, with the hydroentanglement pressure decreasing step by step, to produce the first composite material.

[0022] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain. The first composite material is laminated with the second fine denier cellulose fiber layer through the pre-punching hydroentangle head, and the second fine denier cellulose fiber layer is bonded with the nylon multifilament layer to form a three-layer material.

[0023] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen and hydroentangled 4 to 6 times. The hydroentanglement pressure is increased first and then decreased for each pass to make a second composite material.

[0024] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried and rolled into a roll to produce wet spunlace nonwoven fabric.

[0025] The first layer of the composite utilizes a hydroentangling process combining high-pressure followed by low-pressure hydroentangling with a highly permeable, small-pore hydroentangling mesh. The initial high pressure allows fine denier cellulose fibers to penetrate more effectively and evenly into the large and small pores of the nylon multifilament, preventing uneven fiber displacement. The higher hydroentangling pressure then ensures the fine denier cellulose fibers inserted into the nylon multifilament pores are fully entangled with the nylon multifilament. The subsequent low pressure acts as a finishing agent, resulting in a smoother surface for the first layer of fine denier cellulose fibers. The highly permeable, small-pore hydroentangling mesh provides support and dehydration while reducing the loss of fine denier cellulose fibers, increasing product yield, and lowering production costs.

[0026] The second layer employs a hydroentangling process combining "low pressure first, then high pressure, then low pressure again" with a highly permeable, small-pore hydroentangled mesh. The initial low pressure allows the second layer of fine denier cellulose fibers to initially entangle with the already composited first layer of fine denier cellulose fibers and nylon multifilament material, effectively preventing large-distance displacement of the second layer's fine denier cellulose fibers and avoiding damage to the first composite layer structure. The subsequent high pressure ensures full cohesion and entanglement between the fine denier cellulose fibers and between the fine denier cellulose fibers and the nylon multifilament material in all three layers, preventing material delamination and shedding. The final low pressure also serves a finishing function, making the surface of the second layer of fine denier cellulose fibers smoother and the material softer.

[0027] Preferably, in step (4), the first hydroentanglement is performed in 3 to 5 hydroentanglements, with the hydroentanglement pressure decreasing step by step. The hydroentanglement pressure of the first hydroentanglement is 35 to 50 bar, the hydroentanglement pressure of the first and last hydroentanglements is 32 to 45 bar, and the hydroentanglement pressure of the last hydroentanglement is 25 to 28 bar.

[0028] Preferably, in step (6), the second hydroentanglement is performed in 4 to 6 hydroentanglements, with the hydroentanglement pressure increasing and decreasing sequentially. The pressure of the first hydroentanglement is 30 to 35 bar, the pressure of the first and last hydroentanglement is 40 to 60 bar, and the pressure of the last hydroentanglement is 28 to 30 bar.

[0029] Preferably, the number of barbs on the spunlace flat screen is 100 to 120.

[0030] The spunlace flat screen curtain uses highly breathable, small-aperture spunlace mesh with a mesh count of 100-120. While providing support and dehydration, the spunlace mesh can reduce the loss of fine denier cellulose fibers, improve product yield, and reduce production costs.

[0031] Preferably, the fine denier cellulose fiber suspension is prepared by: feeding fine denier cellulose fibers into a fiber dispersion device and performing intermittent impact dispersion to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.2-1.0%.

[0032] Preferably, the drying process is a non-contact hot air drying with equal width.

[0033] While effectively evaporating moisture, it maintains the dimensional stability of the material and avoids material deformation under stretching. Non-contact hot air drying can maintain the velvety feel of the material surface, increase its smoothness and liquid absorption, and improve the product's quality.

[0034] Preferably, the parameters for the intermittent impact dispersion are: an impact cycle of 30-45 seconds, a cycle interval of 30 seconds, and a total duration of 3-5 minutes.

[0035] Thirdly, the present invention also provides the application of a wet-laid spunlace nonwoven fabric composed of fine denier cellulose fiber and nylon multifilament in a skin-adhesive membrane.

[0036] In this invention, when the nonwoven fabric is used as a membrane, it is preferable to place the small loop side (the upper layer of holes formed by the surrounding loop) of the nylon multifilament layer on top, and the large loop side (the lower layer of holes formed by the X-shaped connection of the multifilaments) close to the skin. The small loop is transferred to the large loop, and the small loop on top prevents backflow and evaporation, improves the liquid conductivity and release properties of the material, and promotes the conduction of the essence to the skin.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) Fine denier cellulose fiber is used as the main raw material. It is laid on the upper and lower layers of nylon multifilament and hydroentangled with it to promote the formation of entanglement points, increase the composite strength between layers, improve the softness of the composite material, and can better fit the skin.

[0039] (2) Using nylon multifilament as the skeleton material provides more pore space, which not only facilitates the penetration and entanglement of fine denier cellulose fibers, improves the entanglement and composite force, and improves the liquid absorption, conduction and release properties of the material, but also greatly improves the softness of the composite material, which can better fit the skin, promote the skin's absorption of liquid, and is more conducive to exerting the efficacy of the essence.

[0040] (3) The layered hydroentanglement composite process enables the fibers to fully bond and entangle, avoiding material delamination and shedding, and making the nonwoven fabric surface more delicate and the material softer. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the cross-sectional structure of a nonwoven fabric. [The small loops of the nylon multifilament layer (the upper layer holes formed by the surrounding loops) are on top, and the large loops of the nylon multifilament layer (the lower layer holes formed by the X-shaped connecting multifilaments) are on the bottom.]

[0042] Figure 2 This is a schematic diagram of the front structure of a nonwoven fabric [the small loops of the nylon multifilament layer (the upper holes formed by the surrounding loops) are on top].

[0043] Figure 3 This is a front view of the nonwoven fabric [with the small loops of the nylon multifilament layer (the upper holes formed by the surrounding loops) on top]. Detailed Implementation

[0044] The technical solution of the present invention is illustrated below with specific embodiments, but the scope of protection of the present invention is not limited thereto:

[0045] like Figure 1 As shown, the wet-spunlace nonwoven fabric of the present invention includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer. The middle nylon multifilament layer has a double-layer skeleton structure, and the fine denier cellulose fibers in the upper and lower layers are interwoven with the nylon multifilament layer. The unit area mass of the nonwoven fabric is 25-90 g / m². 2 Its raw materials include 12-75% nylon multifilament and 25-88% fine denier cellulose fiber (the fine denier cellulose fiber used in the upper and lower layers is of the same mass), with a total mass percentage of 100%.

[0046] The above-mentioned method for preparing nonwoven fabric includes the following steps:

[0047] (1) Fine denier cellulose fiber layer: Fine denier cellulose fibers with a fineness of 0.3 to 0.9 dtex are fed into a fiber dispersion device and subjected to intermittent impact dispersion. The impact lasts for 30 to 45 seconds per cycle, with a cycle interval of 30 seconds and a total duration of 3 to 5 minutes, to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.2 to 1.0%. The fine denier cellulose fiber suspension is diluted and deknotted before being fed into an inclined wire forming device for dehydration and wire forming to prepare a fine denier cellulose fiber layer.

[0048] (2) Nylon multifilament layer: Nylon monofilaments with a fineness of 18–23 μm are arranged in a relaxed state, with 4–7 strands forming a single strand, and then combined to form a multifilament layer. The multifilament layer is constructed by loosely winding the multifilaments into loops, the loops being O-shaped, Ω-shaped, or diamond-shaped. Each loop is a double-layer structure formed independently by two strands of multifilaments. For example… Figure 2 As shown, the horizontally adjacent enclosing rings are connected by single strands of multifilament in an X-shaped pattern, with the enclosing rings on the upper layer ( Figure 2 The surrounding loop is Ω-shaped, and the X-shaped connecting multifilament is in the lower layer. The area of ​​the holes in the upper layer formed by the surrounding loop is smaller than the area of ​​the holes in the lower layer formed by the X-shaped connecting multifilament, forming a double-layer skeleton structure with one large loop and one small loop, thus creating a nylon multifilament layer; and, as Figure 3 The image shown is a photograph of the actual product with the small loops of the nylon multifilament layer facing up, which is considered the front of the nonwoven fabric in this invention.

[0049] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0050] (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen (the number of barbed wires is 100 to 120 meshes), and the hydroentangled process is used to perform 3 to 5 hydroentanglements. The hydroentanglement pressure decreases with each pass. The pressure of the first hydroentanglement is 35 to 50 bar, the pressure of the first and last hydroentanglement is 32 to 45 bar, and the pressure of the last hydroentanglement is 25 to 28 bar, thus producing the first composite material.

[0051] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material.

[0052] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen (the number of barbed wires is 100 to 120 meshes), and the hydroentangled material is subjected to 4 to 6 hydroentanglements. The hydroentanglement pressure is increased and then decreased in each pass. The pressure of the first pass is 30 to 35 bar, the pressure of the first and last passes is 40 to 60 bar, and the pressure of the last pass is 28 to 30 bar, thus producing the second composite material.

[0053] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried (equal width non-contact hot air drying), rolled into rolls, and made into wet spunlace nonwoven fabric.

[0054] Example 1

[0055] A wet-laid spunlace nonwoven fabric composed of fine denier cellulose fiber and nylon multifilament includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer, with a unit area mass of 25 g / m². 2 Its raw materials include 56% nylon multifilament and 44% fine denier cellulose fiber by weight.

[0056] The above-mentioned method for preparing nonwoven fabric includes the following steps:

[0057] (1) Fine denier cellulose fiber layer: Fine denier cellulose fibers with a fineness of 0.35 dtex are fed into a fiber dispersion device and subjected to intermittent impact dispersion. The impact lasts for 30 seconds as one cycle, with a cycle interval of 30 seconds and a total duration of 3 minutes, to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.2%. The fine denier cellulose fiber suspension is diluted and deknotted before being fed into an inclined wire forming device for dehydration and wire forming to prepare a fine denier cellulose fiber layer.

[0058] (2) Nylon multifilament layer: Four nylon monofilaments with a fineness of 18-23 μm are laid side by side in a relaxed state to form a multifilament. The nylon multifilament layer is formed by loosely winding the multifilaments into a ring shape. The ring shape is rhomboid. Each ring is a double-layer structure formed by two independent multifilament strands. Adjacent rings are connected by single multifilament strands with an X-shaped pattern. The ring is on the upper layer and the X-shaped connecting multifilament is on the lower layer. The pore area formed by the ring in the upper layer is smaller than the pore area formed by the X-shaped connecting multifilament in the lower layer, forming a double-layer skeleton structure with one large ring and one small ring, thus making the nylon multifilament layer.

[0059] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0060] (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen (the number of barbed wires is 120 meshes), and the hydroentangled process is used to perform three hydroentanglement processes. The hydroentanglement pressure decreases step by step. The pressure of the first hydroentanglement is 35 bar, the pressure of the second hydroentanglement is 32 bar, and the pressure of the last hydroentanglement is 25 bar, thus making the first composite material.

[0061] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material.

[0062] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat mesh curtain (the number of barbed wires is 120 meshes), and the hydroentangled process is used to perform four hydroentanglements. The hydroentanglement pressure is increased and then decreased in stages. The pressure of the first hydroentanglement is 30 bar, the pressure of the second hydroentanglement is 42 bar, the pressure of the third hydroentanglement is 40 bar, and the pressure of the last hydroentanglement is 28 bar, thus making the second composite material.

[0063] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried (equal width non-contact hot air drying), rolled into rolls, and made into wet spunlace nonwoven fabric.

[0064] Example 2

[0065] A wet-laid spunlace nonwoven fabric composed of fine denier cellulose fiber and nylon multifilament includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer, with a unit area mass of 40 g / m². 2 Its raw materials include 35% nylon multifilament and 65% fine denier cellulose fiber by weight.

[0066] The above-mentioned method for preparing nonwoven fabric includes the following steps:

[0067] (1) Fine denier cellulose fiber layer: Fine denier cellulose fibers with a fineness of 0.4 dtex are fed into a fiber dispersion device and subjected to intermittent impact dispersion. The impact lasts for 32 seconds as one cycle, with a cycle interval of 30 seconds and a total duration of 3 minutes, to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.3%. The fine denier cellulose fiber suspension is diluted and deknotted before being fed into an inclined wire forming device for dehydration and wire forming to prepare a fine denier cellulose fiber layer.

[0068] (2) Nylon multifilament layer: Six nylon monofilaments with a fineness of 18-23 μm are laid side by side in a relaxed state to form a multifilament. The nylon multifilament layer is formed by loosely winding the multifilaments into a ring shape. The ring shape is rhomboid. Each ring is a double-layer structure formed by two independent multifilament strands. Adjacent rings are connected by single multifilament strands with an X-shaped pattern. The ring is on the upper layer and the X-shaped connecting multifilament is on the lower layer. The pore area formed by the ring in the upper layer is smaller than the pore area formed by the X-shaped connecting multifilament in the lower layer, forming a double-layer skeleton structure with one large ring and one small ring, thus making the nylon multifilament layer.

[0069] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0070] (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen (the number of barbed wires is 120 meshes), and the hydroentangled process is used to perform four hydroentanglements. The hydroentanglement pressure decreases step by step. The first hydroentanglement pressure is 37 bar, the second hydroentanglement pressure is 35 bar, the third hydroentanglement pressure is 32 bar, and the last hydroentanglement pressure is 26 bar to make the first composite material.

[0071] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material.

[0072] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen (the number of barbed wires is 120 meshes), and the hydroentangled process is used to perform four hydroentanglements. The hydroentanglement pressure is increased and then decreased in each pass. The pressure of the first hydroentanglement is 32 bar, the pressure of the second hydroentanglement is 45 bar, the pressure of the third hydroentanglement is 41 bar, and the pressure of the last hydroentanglement is 29 bar, thus making the second composite material.

[0073] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried (equal width non-contact hot air drying), rolled into rolls, and made into wet spunlace nonwoven fabric.

[0074] Example 3

[0075] A wet-laid spunlace nonwoven fabric composed of fine denier cellulose fiber and nylon multifilament includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer, with a unit area mass of 55 g / m². 2 Its raw materials include 47% nylon multifilament and 53% fine denier cellulose fiber by weight.

[0076] The above-mentioned method for preparing nonwoven fabric includes the following steps:

[0077] (1) Fine denier cellulose fiber layer: Fine denier cellulose fibers with a fineness of 0.6 dtex are fed into a fiber dispersion device and subjected to intermittent impact dispersion. The impact lasts for 39 seconds as one cycle, with a cycle interval of 30 seconds and a total duration of 4 minutes, to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.3%. The fine denier cellulose fiber suspension is diluted, deknotted, and then fed into an inclined wire mesh forming device for dehydration and wire mesh formation to prepare a fine denier cellulose fiber layer.

[0078] (2) Nylon multifilament layer: Six nylon monofilaments with a fineness of 18-23 μm are laid side by side in a relaxed state to form a multifilament. The nylon multifilament layer is formed by loosely winding the multifilaments into an encircling loop in an Ω-shaped manner. Each encircling loop is an overlapping double-layer structure formed independently by two multifilament strands. Adjacent encircling loops are connected by single multifilament strands with an X-shaped pattern. The encircling loop is on the upper layer, and the X-shaped connecting multifilament is on the lower layer. The pore area formed by the encircling loop on the upper layer is smaller than the pore area formed by the X-shaped connecting multifilament on the lower layer, forming a double-layer skeleton structure with one large loop and one small loop, thus producing the nylon multifilament layer;

[0079] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0080] (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen (the number of barbed wires is 110 meshes), and the hydroentangled process is used to perform four hydroentanglements. The hydroentanglement pressure decreases with each pass. The first hydroentanglement pressure is 39 bar, the second hydroentanglement pressure is 37 bar, the third hydroentanglement pressure is 35 bar, and the last hydroentanglement pressure is 27 bar, thus making the first composite material.

[0081] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material.

[0082] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen (the number of barbed wires is 110 meshes), and the hydroentangled process is used to perform 5 hydroentanglements. The hydroentanglement pressure is increased and then decreased in each stage. The pressure of the first hydroentanglement is 33 bar, the pressure of the second hydroentanglement is 45 bar, the pressure of the third hydroentanglement is 50 bar, the pressure of the fourth hydroentanglement is 42 bar, and the pressure of the last hydroentanglement is 29 bar, thus making the second composite material.

[0083] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried (equal width non-contact hot air drying), rolled into rolls, and made into wet spunlace nonwoven fabric.

[0084] Example 4

[0085] A wet-laid spunlace nonwoven fabric composed of fine denier cellulose fiber and nylon multifilament includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer, with a unit area mass of 90 g / m². 2 Its raw materials include 29% nylon multifilament and 71% fine denier cellulose fiber by weight.

[0086] The above-mentioned method for preparing nonwoven fabric includes the following steps:

[0087] (1) Fine denier cellulose fiber layer: Fine denier cellulose fibers with a fineness of 0.8 dtex are fed into a fiber dispersion device and subjected to intermittent impact dispersion. The impact lasts for 45 seconds as one cycle, with a cycle interval of 30 seconds and a total duration of 5 minutes, to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.8%. The fine denier cellulose fiber suspension is diluted and deknotted before being fed into an inclined wire forming device for dehydration and wire forming to prepare a fine denier cellulose fiber layer.

[0088] (2) Nylon multifilament layer: Seven nylon monofilaments with a fineness of 18-23 μm are laid side by side in a relaxed state to form a multifilament. The nylon multifilament layer is formed by loosely winding the multifilaments into an O-shaped loop. Each loop is an overlapping double-layer structure formed independently by two multifilaments. Adjacent loops are connected by single multifilaments with an X-shaped pattern. The loop is on the upper layer and the X-shaped connecting multifilament is on the lower layer. The pore area of ​​the upper layer formed by the loop is smaller than the pore area of ​​the lower layer formed by the X-shaped connecting multifilament, forming a double-layer skeleton structure with one large loop and one small loop, thus making the nylon multifilament layer.

[0089] (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material.

[0090] (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen (the number of barbed wires is 100 meshes), and the hydroentangled process is used to perform 5 hydroentanglements. The hydroentanglement pressure decreases step by step. The first hydroentanglement pressure is 50 bar, the second hydroentanglement pressure is 45 bar, the third hydroentanglement pressure is 42 bar, the fourth hydroentanglement pressure is 37 bar, and the last hydroentanglement pressure is 28 bar, thus making the first composite material.

[0091] (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material.

[0092] (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen (the number of barbed wires is 100 meshes), and the hydroentangled process is used to perform 6 hydroentanglements. The hydroentanglement pressure is increased and then decreased in each stage. The pressure of the first hydroentanglement is 35 bar, the pressure of the second hydroentanglement is 50 bar, the pressure of the third hydroentanglement is 55 bar, the pressure of the fourth hydroentanglement is 60 bar, the pressure of the fifth hydroentanglement is 45 bar, and the pressure of the last hydroentanglement is 30 bar, thus making the second composite material.

[0093] (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried (equal width non-contact hot air drying), rolled into rolls, and made into wet spunlace nonwoven fabric.

[0094] Comparative Example 1

[0095] The difference from Example 3 is that the hydroentangling pressure of the first hydroentangling composite remains unchanged (the two layers of material are introduced onto a hydroentangling flat screen (110 mesh), and hydroentangling is performed on it 4 times with a hydroentangling pressure of 40 bar to produce the first composite material).

[0096] Comparative Example 2

[0097] The difference from Example 3 is that the hydroentangling pressure of the second hydroentangling composite remains unchanged (the three layers of material are introduced onto a hydroentangling flat screen (110 mesh), and the hydroentangling process is used to perform 5 hydroentangling passes, with a hydroentangling pressure of 40 bar each time, to produce the second composite material).

[0098] Comparative Example 3

[0099] The difference from Example 3 is that the hydroentangling pressure of the second hydroentangling composite is increased step by step (the three layers of material are introduced onto the hydroentangling flat screen (the number of barbs is 110 mesh), and the hydroentangling process is used to perform 5 hydroentangling passes, with the hydroentangling pressure increasing step by step: the first hydroentangling pressure is 32 bar, the second hydroentangling pressure is 43 bar, the third hydroentangling pressure is 47 bar, the fourth hydroentangling pressure is 50 bar, and the last hydroentangling pressure is 54 bar, thus forming the second composite material).

[0100] Comparative Example 4

[0101] The difference from Example 3 is that the hydroentangling pressure of the second hydroentangling composite is gradually decreasing (the three layers of material are introduced onto the hydroentangling flat screen (the number of barbs is 110 mesh), and the hydroentangling process is used to perform 5 hydroentangling passes, with the hydroentangling pressure decreasing gradually: the first hydroentangling pressure is 54 bar, the second hydroentangling pressure is 50 bar, the third hydroentangling pressure is 47 bar, the fourth hydroentangling pressure is 43 bar, and the last hydroentangling pressure is 29 bar, thus forming the second composite material).

[0102] Test method:

[0103] 1. Weight per unit area: Refer to GB / T 24218.1-2009 Textiles - Test Methods - Part 1: Determination of mass per unit area.

[0104] 2. Thickness: Refer to GB / T 24218.2-2009 Textiles - Test Methods - Part 2: Determination of Thickness.

[0105] 3. Liquid absorption rate: Refer to GB / T 24218.6-2010 Textiles, Nonwovens, Test Methods, Part 6: Determination of absorbency.

[0106] 4. Dry breaking strength and dry breaking elongation: Refer to GB / T 24218.3-2010 Textiles, Nonwovens, Test Methods, Part 3: Determination of breaking strength and breaking elongation.

[0107] 5. Bending length: Refer to GB / T 18318.1-2009 Determination of bending properties of textiles - Part 1: Inclined plane method.

[0108] Table 1

[0109]

[0110]

[0111] As shown in Table 1, the wet-spunlace nonwoven fabric of this invention exhibits higher interlayer composite strength, as well as high liquid absorption, conduction, release, and softness, allowing for better skin adhesion and promoting skin absorption of liquids. When used as a membrane, it is more conducive to maximizing the efficacy of the essence. Furthermore, comparing Comparative Examples 1-4 and Example 3, Example 3 showed the best liquid absorption rate, tensile breaking strength, and softness. Comparative Examples 1-4 showed significantly reduced liquid absorption rate and tensile breaking strength, but significantly increased bending length; the greater the bending length, the stiffer the nonwoven fabric. Therefore, the data results indicate that pressure control during secondary hydroentanglement is particularly important for the performance of nonwoven fabrics. The combination of the nonwoven composite structure and hydroentanglement pressure ensures sufficient cohesion and entanglement between fibers, resulting in higher composite strength and liquid absorption rate, and a smoother, softer material surface.

[0112] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A wet-laid spunlace nonwoven fabric composed of fine denier cellulose fibers and nylon multifilaments, characterized in that, The nonwoven fabric includes a nylon multifilament layer and fine denier cellulose fiber layers disposed on the upper and lower layers of the nylon multifilament layer; the nylon multifilament layer is formed by loosely winding multifilaments into loops, with adjacent loops connected by single strands of multifilament in an X-shaped pattern, the loops being on the upper layer and the X-shaped connecting multifilaments being on the lower layer, forming a double-layer skeleton structure; in the double-layer skeleton structure, the pore area formed by the loops in the upper layer is smaller than the pore area formed by the X-shaped connecting multifilaments in the lower layer.

2. The wet-laid spunlace nonwoven fabric of fine denier cellulose fiber composite nylon multifilament according to claim 1, characterized in that, The shape of the enclosing ring is O-shaped, Ω-shaped, or rhomboid; a single enclosing ring is a double-layer structure formed by two strands of multifilaments overlapping each other.

3. The wet-laid spunlace nonwoven fabric of fine denier cellulose fiber composite nylon multifilament according to any one of claims 1-2, characterized in that, The multifilament is formed by combining 4 to 7 nylon monofilaments with a fineness of 18 to 23 μm in a parallel, relaxed state to form a multifilament; the fine denier cellulose fiber has a fineness of 0.3 to 0.9 dtex.

4. The wet-laid spunlace nonwoven fabric of fine denier cellulose fiber composite nylon multifilament according to any one of claims 1-2, characterized in that, The nonwoven fabric has a unit area mass of 25–90 g / m². 2 Its raw materials include 12-75% nylon multifilament and 25-88% fine denier cellulose fiber by mass.

5. A method for preparing the nonwoven fabric as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Fine denier cellulose fiber layer: The fine denier cellulose fiber suspension is fed into the inclined wire mesh forming machine, dehydrated and formed into a wire mesh to form a fine denier cellulose fiber layer; (2) Nylon multifilament layer: Nylon monofilaments are combined into a single strand in a relaxed state to form a multifilament, and then the multifilaments are wound into a loop in a relaxed state to form a nylon multifilament layer; (3) First pre-punching and lamination: The nylon multifilament layer is fed into the composite conveyor curtain, and the fine denier cellulose fiber layer is laminated with the nylon multifilament layer through the pre-punching hydroentangle head to make two layers of material; (4) First hydroentangled composite: The two layers of material are introduced onto the hydroentangled flat screen and hydroentangled 3 to 5 times. The hydroentanglement pressure is gradually reduced to make the first composite material. (5) Second pre-punching and lamination: After the first composite material is dehydrated, it is sent back into the composite conveyor curtain and the first composite material is laminated with the second layer of fine denier cellulose fiber layer through the pre-punching hydroentangle head to make a three-layer material; (6) Second hydroentangled composite: The three-layer material is introduced onto the hydroentangled flat screen and hydroentangled 4 to 6 times. The hydroentanglement pressure is increased and then decreased in each pass to make the second composite material. (7) Dehydration and shaping: The composite material is dehydrated in the second step, then dried and rolled into a roll to produce wet spunlace nonwoven fabric.

6. The preparation method according to claim 5, characterized in that, In the first hydroentanglement step (4), the first hydroentanglement pressure is 35-50 bar, the hydroentanglement pressure of the first and last hydroentanglement is 32-45 bar, and the hydroentanglement pressure of the last hydroentanglement is 25-28 bar.

7. The preparation method according to claim 5, characterized in that, In the second hydroentanglement step (6), the first hydroentanglement pressure is 30~35 bar, the hydroentanglement pressure of the first and last hydroentanglement is 40~60 bar, and the hydroentanglement pressure of the last hydroentanglement is 28~30 bar.

8. The preparation method according to any one of claims 5-7, characterized in that, The number of barbs on the spunlace flat mesh curtain is 100-120 mesh; the fine denier cellulose fiber suspension is prepared by: feeding fine denier cellulose fibers into a fiber dispersion device and performing intermittent impact dispersion to prepare a fine denier cellulose fiber suspension with a mass concentration of 0.2-1.0%.

9. The use of a nonwoven fabric as described in any one of claims 1-4 or a nonwoven fabric prepared by any one of claims 5-8 in a skin-adhesive membrane.

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