CN117904793A - Wet-process spunlaced non-woven fabric of fine denier cellulose fiber composite nylon multifilament and preparation method and application thereof - Google Patents
Wet-process spunlaced non-woven fabric of fine denier cellulose fiber composite nylon multifilament and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to the technical field of non-woven fabrics, and discloses a wet-process spunlaced non-woven fabric of fine denier cellulose fiber composite nylon multifilament, a preparation method and application thereof, wherein the non-woven fabric comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer; the nylon multifilament layer takes multifilament as a unit, is wound into surrounding rings in a loose state, the transversely adjacent surrounding rings are connected through single multifilament in an X-shaped texture, the surrounding rings are arranged on the upper layer, and the X-shaped connecting multifilament is arranged on the lower layer, so that a double-layer framework structure is formed. According to the invention, the nylon multifilament is used as a framework material, more pore space is provided, fine denier cellulose fibers are paved on the upper layer and the lower layer of the nylon multifilament and are subjected to hydroentanglement compounding with the nylon multifilament, so that the formation of entangled nodes is promoted, the compounding strength between the layers is increased, and the liquid absorption, liquid guide, liquid release and softness of the composite material are improved.
Description
Technical Field
The invention relates to the technical field of non-woven fabrics, in particular to a wet-process spunlaced non-woven fabric of fine denier cellulose fiber composite nylon multifilament, a preparation method and application thereof.
Background
The wet spun-laced non-woven fabric is made up by using short fibre through wet process, then spraying high-pressure microfine water flow onto one or several layers of fibre web to make the fibres mutually intertwined together so as to make the fibre web be reinforced and possess a certain strong non-woven sheet material, and finally can be passed through after-finishing treatment to improve the characteristics of product. The composite non-woven fabric is a comprehensive material obtained by compositing two or more non-woven fabrics with different properties, and can combine the advantages of the two or more non-woven fabrics, so that the defects of roughness, chip drop, poor liquid absorption and liquid retention of the traditional non-woven fabric are overcome.
The Chinese patent publication No. CN109576908B discloses a composite cloth of superfine denier viscose fiber and elastic mesh cloth and a preparation process thereof, wherein the composite cloth is prepared from a reticular fiber layer and a base cloth, the mass ratio of the reticular fiber layer to the base cloth is 52:48, and the reticular fiber layer is formed by a superfine denier viscose fiber slurry by a wet method; the base cloth is elastic mesh cloth. The Chinese patent publication No. CN109605844B discloses a composite cloth of tank fibers and elastic mesh cloth and a preparation method thereof, wherein the composite cloth is prepared from a reticular fiber layer and a base cloth, the mass ratio of the reticular fiber layer to the base cloth is 53:47, and the reticular fiber layer is formed by a wet method of tank fiber slurry; the base cloth is elastic mesh cloth. The above patent is that the process step of processing the first step superfine viscose fiber/tank-western fiber into dry paper is changed to a wet papermaking process, the forming step is quickened, and the water jet composite process part is combined, so that two main raw material parts can be fully and compositely linked.
However, the hexagonal mesh elastic mesh cloth is formed by twisting and spirally winding nylon monofilaments, has less pore space, is not only unfavorable for penetration entanglement of superfine viscose fibers/tank fibers, has poor interlayer bonding property and lower strength, but also causes poor liquid absorption, liquid guide and liquid release of the material.
Disclosure of Invention
In order to solve the technical problems, the invention provides the wet spun-laced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament and the preparation method and application thereof, and the fine denier cellulose fiber and the nylon multifilament are adopted to be compounded, and the structure of a nylon multifilament layer is improved to be used as a framework material, so that more pore space can be provided, the penetration and entanglement of the fine denier cellulose fiber are facilitated, the entanglement combination force is improved, the liquid absorption, the liquid guiding and the liquid releasing of the material are improved, the softness of the composite material is greatly improved, the composite material can be better attached to skin, the absorption of the skin to the liquid is promoted, and the effect of essence is more beneficial to be exerted.
The aim of the invention is realized by the following technical scheme:
In a first aspect, the present invention provides a wet spun-laced nonwoven fabric of fine denier cellulose fiber composite nylon multifilament, the nonwoven fabric comprising a nylon multifilament layer and fine denier cellulose fiber layers disposed on upper and lower layers of the nylon multifilament layer; the non-woven fabric is prepared by compounding a fine denier cellulose fiber layer, a nylon multifilament layer and a fine denier cellulose fiber layer through a sequential wet method by water jet; the nylon multifilament layer takes multifilament as a unit, is wound into surrounding rings in a loose state, the transversely adjacent surrounding rings are connected through single multifilament in an X-shaped texture, the surrounding rings are arranged on the upper layer, and the X-shaped connecting multifilament is arranged on the lower layer, so that a double-layer framework structure is formed.
According to the invention, the fine denier cellulose fibers are adopted as the main raw materials, the fine denier cellulose fibers are paved on the upper layer and the lower layer of the nylon multifilament and are subjected to spunlaced compounding with the nylon multifilament, so that the fine denier cellulose fibers and the nylon multifilament form winding points, the compounding strength between the layers is increased, capillary channels for liquid conduction among the upper layer, the middle layer and the lower layer are formed, the liquid absorption rate is improved, and meanwhile, the conduction of essence is promoted.
The nylon multifilament layer adopts a loose ring framework, so that the strength of a product can be improved, the size of the product is stabilized, the deformation rate is reduced, and sufficient and uniform pores are provided for the interpenetration displacement of the fine denier cellulose fibers, so that the fine denier cellulose fibers release more head hairiness. When the nylon multifilament composite is adhered to skin, the double-layer skeleton structure forms a structure with one large ring and one small ring due to the size difference of holes formed by the surrounding rings and the X-shaped connecting multifilament, and the large ring and the small ring structurally play a role in reverse funnel, so that essence can be directionally conducted to the skin, the essence flowing to the skin is locked, the countercurrent volatilization of the essence is prevented, and the liquid absorption, liquid guide and liquid release of the material are improved.
The nylon multifilament is used as a framework material, more pore space is provided, penetration entanglement of fine denier cellulose fibers is facilitated, entanglement complex force is improved, liquid absorption, liquid guiding and liquid releasing of the material are improved, softness of the composite material is greatly improved, the composite material can be better attached to skin, absorption of the skin to liquid is promoted, and effects of essence are better exerted. Compared with the traditional wet-process spunlaced composite non-woven fabric, the method has the advantages that firstly, the problem that the wet-process composite material is easy to fall off scraps is effectively solved; secondly, more liquid absorption and guide carriers are provided, and the material has certain directivity, so that the liquid absorption, guide and release properties of the material are improved; thirdly, the limitation that the conventional composite material is not soft enough is improved, and the softness of the composite material is greatly improved by finer nylon yarns and fibers, so that the composite material can be better attached to the skin when the composite material is used as a membrane cloth.
Preferably, the shape of the surrounding ring is O-shaped, omega-shaped or diamond-shaped; the single enclosure is a double-layer structure formed by two multifilament yarns independently.
Preferably, in the double-layer skeleton structure, the area of the holes of the upper layer formed by the surrounding rings is smaller than the area of the holes of the lower layer formed by the X-shaped connecting multifilament.
Because the size difference of the holes formed by the surrounding rings and the X-shaped connecting multifilament is that the nylon multifilament layer forms a structure with one large ring and one small ring, the large ring and the small ring play a role of inverse funneling structurally, can directionally conduct essence to the skin, lock the essence flowing to the skin, prevent the countercurrent volatilization of the essence, and improve the liquid absorption, liquid guide and liquid release of the material.
Preferably, the multifilament yarn is: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 4-7 nylon monofilaments in parallel loose state as one strand; the fineness of the fine denier cellulose fiber is 0.3-0.9 dtex.
Preferably, the unit area mass of the non-woven fabric is 25-90 g/m 2, and the raw materials comprise 12-75% by mass of nylon multifilament and 25-88% by mass of fine denier cellulose fibers.
Preferably, the fine denier cellulose fibers are one or more of viscose, lyocell and modal fibers.
In a second aspect, the invention also provides a preparation method of the wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament, which comprises the following steps:
(1) Fine denier cellulosic fiber layer: feeding the fine denier cellulose fiber suspension into an inclined wire former, and dehydrating and forming a wire to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: the nylon monofilaments are combined into multifilament by a parallel loose state and are one strand, and then wound into a surrounding ring by taking the multifilament as a unit in a loose state to prepare a nylon multifilament layer;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain, and performing 3-5 times of spunlacing on the two layers of materials by using a spunlacing process, wherein the spunlacing pressure is gradually decreased gradually, so as to prepare a first composite material;
(5) And (3) secondary pre-needling lamination: dewatering the primary composite material, then feeding the dewatered primary composite material into a composite conveying curtain again, overlapping the primary composite material with a second fine denier cellulose fiber layer through a pre-needling head, and enabling the second fine denier cellulose fiber layer to be attached to a nylon multifilament layer to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain, and performing 4-6 times of spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and then gradually decreased from one channel to another channel to prepare a second composite material;
(7) Dehydrating and shaping: dehydrating the second composite material, drying and rolling to obtain the wet spun-laced non-woven fabric.
The first layer of the composition adopts a water jet process of combining the water jet pressure of high pressure and low pressure with a water jet net with high air permeability and small aperture. The initial high pressure can enable the fine denier cellulose fibers to be more effectively and uniformly inserted into the large pores and the small pores of the nylon multifilament, uneven displacement of the fibers is avoided, the fine denier cellulose fibers inserted into the pores of the nylon multifilament are fully entangled with the nylon multifilament by using higher water jet pressure, and then the low pressure plays a modifying role, so that the surface of the first layer of fine denier cellulose is finer. The high-air-permeability small-aperture water-jet net has the functions of supporting and dewatering, and can reduce the loss of fine denier cellulose fibers, improve the product yield and reduce the production cost.
The second layer of the composition adopts a water jet process of combining water jet pressure of 'low pressure, high pressure and low pressure, and high air permeability small-aperture water jet net'. The first low pressure can cause the first layer of fine denier cellulose fiber and the nylon multifilament material which are compounded to be primarily entangled, so that the large distance displacement of the first layer of fine denier cellulose fiber can be effectively avoided, the first composite layer structure is avoided to be damaged, and then the high pressure is used to cause the fine denier cellulose fiber and the nylon multifilament of the three-layer material to be fully cohesive and entangled, and the layering and the chip falling of the material are avoided. The low pressure after the process also plays a role in modification, so that the surface of the second layer of fine denier cellulose is finer and the material is softer.
Preferably, in the step (4), the first hydroentangling is carried out for 3-5 times, the hydroentangling pressure is gradually decreased from one to the next, wherein the first hydroentangling pressure is 35-50 bar, the hydroentangling pressures except the first and the last are 32-45 bar, and the last hydroentangling pressure is 25-28 bar.
Preferably, in the step (6), the second hydroentangling is carried out for 4-6 times, the hydroentangling pressure is gradually increased and gradually decreased, wherein the first time of hydroentangling pressure is 30-35 bar, the first time of hydroentangling pressure and the last time of hydroentangling pressure are 40-60 bar, and the last time of hydroentangling pressure is 28-30 bar.
Preferably, the number of the pricked meshes of the horizontal mesh curtain is 100-120 meshes.
The water-jet net curtain adopts a water-jet net with high air permeability and small aperture, the mesh number of the water-jet net is 100-120 meshes, and the water-jet net can reduce the loss of fine denier cellulose fiber, improve the product yield and reduce the production cost while playing the roles of supporting and dewatering.
Preferably, the preparation of the fine denier cellulose fiber suspension is: the fine denier cellulose fiber is put into fiber dispersing equipment for intermittent impact dispersion to prepare fine denier cellulose fiber suspension with mass concentration of 0.2-1.0%.
Preferably, the drying is equal-amplitude non-contact hot air drying.
The moisture is effectively evaporated, the dimensional stability of the material is maintained, the deformation of the material under the action of stretching is avoided, the non-contact hot air drying can maintain the fluffy feel on the surface of the material, the fine and smooth feel and the liquid absorption performance are improved, and the product grade is improved.
Preferably, the intermittent impact dispersion parameters are: the impact is carried out for 30-45 s in a period which is 30s apart, and the total duration is 3-5 min.
In a third aspect, the invention also provides application of the wet-process spunlaced non-woven fabric of the fine denier cellulose fiber and the nylon multifilament to film cloth attached to the skin.
When the non-woven fabric is used as the membrane fabric, the small loop surface (the upper layer hole formed by surrounding the multifilament) of the nylon multifilament layer is preferably arranged on the upper side, the large loop surface (the lower layer hole formed by X-shaped connecting the multifilament) is close to the skin, and is transferred from the small loop to the large loop, the small loop on the upper side prevents countercurrent volatilization, the liquid guiding and releasing performance of the material is improved, and the conduction of essence to the skin is promoted.
Compared with the prior art, the invention has the following beneficial effects:
(1) Fine denier cellulose fibers are adopted as main raw materials, are paved on the upper layer and the lower layer of the nylon multifilament and are subjected to spunlaced compounding with the nylon multifilament, so that winding points are promoted to be formed, the compounding strength between the layers is increased, the softness of the composite material is improved, and the composite material can be better attached to skin;
(2) The nylon multifilament is used as a framework material, more pore space is provided, penetration and entanglement of fine denier cellulose fibers are facilitated, entanglement combining force is improved, liquid absorption, liquid guiding and liquid releasing of the material are improved, softness of the composite material is greatly improved, the composite material can be better attached to skin, absorption of the skin to liquid is promoted, and effects of essence are better exerted;
(3) The layering water thorn composite technology ensures that fibers are fully cohesive and entangled, avoids layering and chip falling of materials, and ensures that the surface of the non-woven fabric is finer and softer.
Drawings
FIG. 1 is a schematic cross-sectional view of a nonwoven fabric [ the small loop surface of the nylon multifilament layer (the upper layer of holes formed by the surrounding loops) is on top, and the large loop surface of the nylon multifilament layer (the lower layer of holes formed by the X-shaped connecting multifilament) is below ];
Fig. 2 is a schematic diagram of the front structure of the nonwoven fabric [ the small loop surface of the nylon multifilament layer (the upper layer holes formed by the surrounding loops) is the above ];
Fig. 3 is a front photograph of a nonwoven fabric [ the small loop surface of the nylon multifilament layer (the upper layer holes formed by the surrounding loops) is as above ].
Detailed Description
The technical scheme of the present invention is described below by using specific examples, but the scope of the present invention is not limited thereto:
As shown in FIG. 1, the wet spun-laced non-woven fabric of the present invention comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper and lower layers of the nylon multifilament layer, wherein the middle nylon multifilament layer has a double-layer skeleton structure, and the fine denier cellulose fibers on the upper and lower layers are penetratingly entangled with the nylon multifilament layer. The unit area mass of the non-woven fabric is 25-90 g/m 2, the raw materials of the non-woven fabric comprise 12-75% by mass of nylon multifilament and 25-88% by mass of fine denier cellulose fibers (the mass of the fine denier cellulose fibers used in the upper layer and the lower layer is the same), and the total mass percentage is 100%.
The preparation method of the non-woven fabric comprises the following steps:
(1) Fine denier cellulosic fiber layer: adding fine denier cellulose fibers with fineness of 0.3-0.9 dtex into fiber dispersing equipment, performing intermittent impact dispersion, wherein the impact is carried out for 30-45 s as a period, the period interval is 30s, the total duration is 3-5 min, and preparing fine denier cellulose fiber suspension with mass concentration of 0.2-1.0%; diluting the fine denier cellulose fiber suspension, removing fiber knots, feeding the suspension into an inclined wire former, and dehydrating and forming a net to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 4-7 nylon monofilaments in parallel loose state as one strand. The nylon multifilament layer is formed by taking multifilament as a unit and winding the multifilament into a surrounding ring in a loose state, the shape of the surrounding ring is O-shaped, omega-shaped or diamond-shaped, and the single surrounding ring is of a double-layer structure formed by independently forming two multifilament. As shown in fig. 2, the transversely adjacent surrounding rings are connected by single-strand multifilaments in an X-shaped pattern, the surrounding rings are arranged on the upper layer (the surrounding rings in fig. 2 are omega-shaped), the X-shaped connecting multifilaments are arranged on the lower layer, the hole area of the upper layer formed by the surrounding rings is smaller than that of the lower layer formed by the X-shaped connecting multifilaments, a double-layer framework structure with one large ring and one small ring is formed, and a nylon multifilament layer is manufactured; further, as shown in fig. 3, a physical photograph of the nylon multifilament layer on the small loop surface is considered as the front surface of the nonwoven fabric in the present invention.
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain (the number of the barbed nets is 100-120 meshes), performing 3-5 times of spunlacing on the flat net curtain by using a spunlacing process, wherein the spunlacing pressure is gradually decreased, the first time of spunlacing pressure is 35-50 bar, the first time of spunlacing pressure and the last time of spunlacing pressure are 32-45 bar, and the last time of spunlacing pressure is 25-28 bar, so that a first composite material is prepared;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain (the number of the barbed nets is 100-120 meshes), and performing 4-6 times of spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and gradually decreased from one channel to the next, the first time of spunlacing pressure is 30-35 bar, the first time of spunlacing pressure and the last time of spunlacing pressure are 40-60 bar, and the last time of spunlacing pressure is 28-30 bar, so that a second time of composite material is prepared;
(7) Dehydrating and shaping: dehydrating the secondary composite material, drying (equal-width non-contact hot air drying), and rolling to obtain wet spun-laced non-woven fabric.
Example 1
The wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer, wherein the unit area mass is 25g/m 2, and the raw materials comprise 56% by mass of nylon multifilament and 44% by mass of fine denier cellulose fiber.
The preparation method of the non-woven fabric comprises the following steps:
(1) Fine denier cellulosic fiber layer: throwing fine denier cellulose fiber with fineness of 0.35dtex into fiber dispersing equipment for intermittent impact dispersion, wherein the impact is carried out for 30s as a period, the period interval is 30s, and the total duration is 3min, so as to prepare fine denier cellulose fiber suspension with mass concentration of 0.2%; diluting the fine denier cellulose fiber suspension, removing fiber knots, feeding the suspension into an inclined wire former, and dehydrating and forming a net to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 4 nylon monofilaments in parallel loose state as one strand. The nylon multifilament layer is formed by taking multifilament as a unit and winding the multifilament into a surrounding ring in a loose state, the shape of the surrounding ring is diamond, and the single surrounding ring is of a double-layer structure formed by independently forming two multifilament. The transversely adjacent surrounding rings are connected by single multifilament in an X-shaped pattern, the surrounding rings are arranged on the upper layer, the X-shaped connecting multifilament is arranged on the lower layer, the hole area of the upper layer formed by the surrounding rings is smaller than that of the lower layer formed by the X-shaped connecting multifilament, a double-layer framework structure with one large ring and one small ring is formed, and a nylon multifilament layer is manufactured;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain (the number of the barbed nets is 120 meshes), performing 3 times of spunlacing on the flat net curtain by using a spunlacing process, wherein the spunlacing pressure is gradually decreased, the first time of spunlacing pressure is 35bar, the second time of spunlacing pressure is 32bar, and the last time of spunlacing pressure is 25bar, so as to prepare a first composite material;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain (the number of the barbed nets is 120 meshes), and performing 4-step spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and gradually decreased, the first-step spunlacing pressure is 30bar, the second-step spunlacing pressure is 42bar, the third-step spunlacing pressure is 40bar, and the last-step spunlacing pressure is 28bar, so that a second-step composite material is prepared;
(7) Dehydrating and shaping: dehydrating the secondary composite material, drying (equal-width non-contact hot air drying), and rolling to obtain wet spun-laced non-woven fabric.
Example 2
The wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer, wherein the unit area mass is 40g/m 2, and the raw materials comprise the nylon multifilament with the mass percentage of 35% and the fine denier cellulose fiber with the mass percentage of 65%.
The preparation method of the non-woven fabric comprises the following steps:
(1) Fine denier cellulosic fiber layer: throwing fine denier cellulose fibers with fineness of 0.4dtex into fiber dispersing equipment for intermittent impact dispersion, wherein the impact is carried out for 32s as a period, the period interval is 30s, and the total duration is 3min, so that fine denier cellulose fiber suspension with mass concentration of 0.3% is prepared; diluting the fine denier cellulose fiber suspension, removing fiber knots, feeding the suspension into an inclined wire former, and dehydrating and forming a net to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 6 nylon monofilaments in parallel loose state as one strand. The nylon multifilament layer is formed by taking multifilament as a unit and winding the multifilament into a surrounding ring in a loose state, the shape of the surrounding ring is diamond, and the single surrounding ring is of a double-layer structure formed by independently forming two multifilament. The transversely adjacent surrounding rings are connected by single multifilament in an X-shaped pattern, the surrounding rings are arranged on the upper layer, the X-shaped connecting multifilament is arranged on the lower layer, the hole area of the upper layer formed by the surrounding rings is smaller than that of the lower layer formed by the X-shaped connecting multifilament, a double-layer framework structure with one large ring and one small ring is formed, and a nylon multifilament layer is manufactured;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain (the number of the barbed nets is 120 meshes), performing 4-step spunlacing on the flat net curtain by using a spunlacing process, wherein the spunlacing pressure is gradually decreased, the first-step spunlacing pressure is 37bar, the second-step spunlacing pressure is 35bar, the third-step spunlacing pressure is 32bar, and the final-step spunlacing pressure is 26bar, so that a first-time composite material is prepared;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain (the number of the barbed nets is 120 meshes), and performing 4-step spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and gradually decreased, the first-step spunlacing pressure is 32bar, the second-step spunlacing pressure is 45bar, the third-step spunlacing pressure is 41bar, and the last-step spunlacing pressure is 29bar, so that a second-step composite material is prepared;
(7) Dehydrating and shaping: dehydrating the secondary composite material, drying (equal-width non-contact hot air drying), and rolling to obtain wet spun-laced non-woven fabric.
Example 3
The wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer, wherein the mass per unit area is 55g/m 2, and the raw materials comprise the nylon multifilament with the mass percentage of 47% and the fine denier cellulose fiber with the mass percentage of 53%.
The preparation method of the non-woven fabric comprises the following steps:
(1) Fine denier cellulosic fiber layer: throwing fine denier cellulose fiber with fineness of 0.6dtex into fiber dispersing equipment for intermittent impact dispersion, wherein the impact is carried out for 39s as a period, the period interval is 30s, and the total duration is 4min, so as to prepare fine denier cellulose fiber suspension with mass concentration of 0.3%; diluting the fine denier cellulose fiber suspension, removing fiber knots, feeding the suspension into an inclined wire former, and dehydrating and forming a net to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 6 nylon monofilaments in parallel loose state as one strand. The nylon multifilament layer is formed by taking multifilament as a unit and winding the multifilament into a surrounding ring in a loose state, the shape of the surrounding ring is omega-shaped, and a single surrounding ring is of a double-layer structure formed by independently forming two multifilaments. The transversely adjacent surrounding rings are connected by single multifilament in an X-shaped pattern, the surrounding rings are arranged on the upper layer, the X-shaped connecting multifilament is arranged on the lower layer, the hole area of the upper layer formed by the surrounding rings is smaller than that of the lower layer formed by the X-shaped connecting multifilament, a double-layer framework structure with one large ring and one small ring is formed, and a nylon multifilament layer is manufactured;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain (the number of the barbed nets is 110 meshes), performing 4-step spunlacing on the flat net curtain by using a spunlacing process, wherein the spunlacing pressure is gradually decreased, the first-step spunlacing pressure is 39bar, the second-step spunlacing pressure is 37bar, the third-step spunlacing pressure is 35bar, and the final-step spunlacing pressure is 27bar, so that a first-time composite material is prepared;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain (the number of the spunlaced net is 110 meshes), and performing 5 times of spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and gradually decreased, the first time of spunlacing pressure is 33bar, the second time of spunlacing pressure is 45bar, the third time of spunlacing pressure is 50bar, the fourth time of spunlacing pressure is 42bar, and the last time of spunlacing pressure is 29bar, so that a second time composite material is prepared;
(7) Dehydrating and shaping: dehydrating the secondary composite material, drying (equal-width non-contact hot air drying), and rolling to obtain wet spun-laced non-woven fabric.
Example 4
The wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament comprises a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer, wherein the unit area mass is 90g/m 2, and the raw materials comprise 29% by mass of the nylon multifilament and 71% by mass of the fine denier cellulose fiber.
The preparation method of the non-woven fabric comprises the following steps:
(1) Fine denier cellulosic fiber layer: throwing fine denier cellulose fibers with fineness of 0.8dtex into fiber dispersing equipment for intermittent impact dispersion, wherein the impact is carried out for 45s as a period, the period interval is 30s, and the total duration is 5min, so that fine denier cellulose fiber suspension with mass concentration of 0.8% is prepared; diluting the fine denier cellulose fiber suspension, removing fiber knots, feeding the suspension into an inclined wire former, and dehydrating and forming a net to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 7 nylon monofilaments in parallel loose state as one strand. The nylon multifilament layer is formed by winding multifilament into a surrounding ring in a loose state, the shape of the surrounding ring is O-shaped, and a single surrounding ring is of a double-layer structure formed by two multifilament independently. The transversely adjacent surrounding rings are connected by single multifilament in an X-shaped pattern, the surrounding rings are arranged on the upper layer, the X-shaped connecting multifilament is arranged on the lower layer, the hole area of the upper layer formed by the surrounding rings is smaller than that of the lower layer formed by the X-shaped connecting multifilament, a double-layer framework structure with one large ring and one small ring is formed, and a nylon multifilament layer is manufactured;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain (the number of the spunlaced net is 100 meshes), performing 5 times of spunlaces on the two layers of materials by using a spunlaced process, wherein the spunlaced pressure is gradually decreased, the first time of spunlaced pressure is 50bar, the second time of spunlaced pressure is 45bar, the third time of spunlaced pressure is 42bar, the fourth time of spunlaced pressure is 37bar, and the last time of spunlaced pressure is 28bar, so that a first time composite material is prepared;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain (the number of the spunlaced net is 100 meshes), performing 6 times of spunlaces on the three-layer material by using a spunlaced process, wherein the spunlaced pressure is gradually increased and gradually decreased, the first time of spunlaced pressure is 35bar, the second time of spunlaced pressure is 50bar, the third time of spunlaced pressure is 55bar, the fourth time of spunlaced pressure is 60bar, the fifth time of spunlaced pressure is 45bar, and the last time of spunlaced pressure is 30bar, so that a second time composite material is prepared;
(7) Dehydrating and shaping: dehydrating the secondary composite material, drying (equal-width non-contact hot air drying), and rolling to obtain wet spun-laced non-woven fabric.
Comparative example 1
The difference from example 3 is that: the first time of hydro-entangled compounding is carried out by 4 times of hydro-entangled by the hydro-entangled process under 40bar pressure without changing the hydro-entangled pressure (two layers of material are introduced onto a hydro-entangled flat net curtain (the number of the barbed net is 110 meshes), so as to prepare the first time of composite material).
Comparative example 2
The difference from example 3 is that: the hydroentangled pressure of the second hydroentangled composite is unchanged (three layers of materials are introduced to a hydroentangled flat net curtain (the number of the stabbed nets is 110 meshes), 5 times of hydroentangled is carried out by using a hydroentangled process, and the hydroentangled pressure is 40bar, so that the second composite material is prepared.
Comparative example 3
The difference from example 3 is that: the second time of hydroentanglement is that the hydroentanglement pressure is gradually increased (three layers of materials are introduced to a hydroentangled horizontal net curtain (the number of the stabbed net is 110 meshes), 5 times of hydroentanglement is carried out by utilizing a hydroentanglement process, the hydroentanglement pressure is gradually increased, the first time of hydroentanglement pressure is 32bar, the second time of hydroentanglement pressure is 43bar, the third time of hydroentanglement pressure is 47bar, the fourth time of hydroentanglement pressure is 50bar, and the last time of hydroentanglement pressure is 54bar, so that the second time of composite materials is prepared.
Comparative example 4
The difference from example 3 is that: the second time of hydroentanglement is that the hydroentanglement pressure is gradually decreased (three layers of materials are introduced to a hydroentanglement horizontal net curtain (the number of the stabbed net is 110 meshes), 5 times of hydroentanglement is carried out by utilizing a hydroentanglement process, the hydroentanglement pressure is gradually decreased, the first time of hydroentanglement pressure is 54bar, the second time of hydroentanglement pressure is 50bar, the third time of hydroentanglement pressure is 47bar, the fourth time of hydroentanglement pressure is 43bar, and the last time of hydroentanglement pressure is 29bar, so that the second time of composite materials is prepared.
The testing method comprises the following steps:
1. gram weight: reference GB/T24218.1-2009 part 1 of the textile nonwoven test method: measurement of mass per unit area.
2. Thickness: reference GB/T24218.2-2009 textile nonwoven test method part 2: and (5) measuring thickness.
3. Liquid absorption rate: reference GB/T24218.6-2010 part 6 of the textile nonwoven test method: measurement of absorbency.
4. Dry break strength and dry break elongation: reference GB/T24218.3-2010 part 3 of the textile nonwoven test method: determination of breaking Strength and elongation at break.
5. Bending length: determination of flexural Properties of textiles with reference to GB/T18318.1-2009 part 1: and (5) a bevel method.
TABLE 1
As shown in Table 1, the wet spun-laced non-woven fabric has higher interlayer composite strength, high liquid absorption, liquid guide, liquid release and softness, can be better attached to skin, promotes the absorption of liquid by the skin, and is more beneficial to playing the effect of essence when being used as membrane cloth. In addition, in the combination of comparative examples 1 to 4 and example 3, the liquid absorption rate, tensile breaking strength and softness of example 3 are all optimal, the liquid absorption rate and tensile breaking strength of comparative examples 1 to 4 are both remarkably reduced, the bending length is remarkably increased, and the nonwoven fabric is harder as the bending length is larger. Therefore, the data result shows that the pressure control of the secondary hydroentanglement is particularly important for the performance of the non-woven fabric, and the non-woven fabric composite structure is matched with the hydroentanglement pressure, so that the fibers are fully cohesive and entangled, the composite strength and the liquid absorption rate of the material are higher, and the surface of the material is finer and softer.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures disclosed herein or modifications in the equivalent processes, or any application of the structures disclosed herein, directly or indirectly, in other related arts.
Claims (10)
1. The wet-process spunlaced non-woven fabric of the fine denier cellulose fiber composite nylon multifilament is characterized by comprising a nylon multifilament layer and fine denier cellulose fiber layers arranged on the upper layer and the lower layer of the nylon multifilament layer; the nylon multifilament layer takes multifilament as a unit, is wound into surrounding rings in a loose state, the transversely adjacent surrounding rings are connected through single multifilament in an X-shaped texture, the surrounding rings are arranged on the upper layer, and the X-shaped connecting multifilament is arranged on the lower layer, so that a double-layer framework structure is formed.
2. The wet spun-laced nonwoven fabric of fine denier cellulose fiber composite nylon multifilament yarn of claim 1, wherein the surrounding loop is O-shaped, Ω -shaped or diamond-shaped; the single enclosure is a double layer structure formed by overlapping two multifilament yarns.
3. The wet spun-laced nonwoven fabric of fine denier cellulose fiber composite nylon multifilament according to claim 1, wherein the upper layer of the surrounding loop has a smaller pore area than the lower layer of the X-shaped connecting multifilament in the double-layer skeleton structure.
4. A wet spun-laced nonwoven fabric of fine denier cellulose fiber composite nylon multifilament yarn according to one of claims 1-3, characterized in that the multifilament yarn is: nylon monofilaments with fineness of 18-23 mu m are compounded into multifilament by taking 4-7 nylon monofilaments in parallel loose state as one strand; the fineness of the fine denier cellulose fiber is 0.3-0.9 dtex.
5. A wet spun-laced nonwoven fabric of fine denier cellulose fiber composite nylon multifilament yarn according to one of claims 1-3, characterized in that the nonwoven fabric has a mass per unit area of 25-90 g/m 2, and the raw materials comprise nylon multifilament yarn of 12-75% by mass and fine denier cellulose fiber of 25-88% by mass.
6. A method for producing the nonwoven fabric according to any one of claims 1 to 5, comprising the steps of:
(1) Fine denier cellulosic fiber layer: feeding the fine denier cellulose fiber suspension into an inclined wire former, and dehydrating and forming a wire to prepare a fine denier cellulose fiber layer;
(2) Nylon multifilament layer: the nylon monofilaments are combined into multifilament by a parallel loose state and are one strand, and then wound into a surrounding ring by taking the multifilament as a unit in a loose state to prepare a nylon multifilament layer;
(3) First pre-needling lamination: sending the nylon multifilament layer into a composite conveying curtain, and superposing the fine denier cellulose fiber layer and the nylon multifilament layer through a pre-needling head to prepare two layers of materials;
(4) First water jet compounding: introducing two layers of materials onto a spunlaced flat net curtain, and performing 3-5 times of spunlacing on the two layers of materials by using a spunlacing process, wherein the spunlacing pressure is gradually decreased gradually, so as to prepare a first composite material;
(5) And (3) secondary pre-needling lamination: dewatering the first composite material, then sending the first composite material into a composite conveying curtain again, and superposing the first composite material and a second fine denier cellulose fiber layer through a pre-needling head to prepare a three-layer material;
(6) And (3) carrying out secondary hydroentanglement compounding: introducing the three-layer material onto a spunlaced flat net curtain, and performing 4-6 times of spunlacing on the three-layer material by using a spunlacing process, wherein the spunlacing pressure is gradually increased and then gradually decreased from one channel to another channel to prepare a second composite material;
(7) Dehydrating and shaping: dehydrating the second composite material, drying and rolling to obtain the wet spun-laced non-woven fabric.
7. The method according to claim 6, wherein in the first hydroentangling step (4), the first hydroentangling pressure is 35-50 bar, the second and the last hydroentangling pressures are 32-45 bar, and the last hydroentangling pressure is 25-28 bar.
8. The method of claim 6, wherein in the second hydroentangling step (6), the first hydroentangling pressure is 30-35 bar, the second hydroentangling pressure is 40-60 bar except the first and the last hydroentangling pressures, and the last hydroentangling pressure is 28-30 bar.
9. The method according to any one of claims 6 to 8, wherein the number of barbed wires of the hydraulically entangled flat wire curtain is 100 to 120 mesh; the preparation of the fine denier cellulose fiber suspension is as follows: the fine denier cellulose fiber is put into fiber dispersing equipment for intermittent impact dispersion to prepare fine denier cellulose fiber suspension with mass concentration of 0.2-1.0%.
10. Use of a nonwoven fabric according to any one of claims 1 to 5 or a nonwoven fabric produced by a process according to any one of claims 6 to 9 for adhering to skin.
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