CN113737389B - Three-carding spunlaced non-woven fabric directly paved and preparation method thereof - Google Patents

Three-carding spunlaced non-woven fabric directly paved and preparation method thereof Download PDF

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CN113737389B
CN113737389B CN202111153900.6A CN202111153900A CN113737389B CN 113737389 B CN113737389 B CN 113737389B CN 202111153900 A CN202111153900 A CN 202111153900A CN 113737389 B CN113737389 B CN 113737389B
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fiber
layer
fiber layer
fibers
web
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CN113737389A (en
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王洋
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Lide Filter Material Technology Suzhou Co ltd
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Lide Filter Material Technology Suzhou Co ltd
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    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/48Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
    • D04H1/49Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation entanglement by fluid jet in combination with another consolidation means
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/558Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in combination with mechanical or physical treatments other than embossing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The application discloses a three-carding spunlaced non-woven fabric with direct lapping, which comprises a first fiber layer, a third fiber layer and a second fiber layer positioned between the first fiber layer and the third fiber layer, wherein the second fiber layer comprises a plurality of fiber areas which are mutually spaced, the first fiber layer and the third fiber layer are hydrophilic fiber structure layers, the second fiber layer is a low-melting-point fiber structure layer, and the second fiber layer is thermally fused at the positions of the plurality of fiber areas and bonds the first fiber layer and the third fiber layer; this application sets up the second fibrous layer that can the hot melt bond between hydrophilic first fibrous layer and third fibrous layer, and the fibrous raw materials interval on second fibrous layer lays, makes this non-woven fabrics not adopt alternately lapping technology processing also can obtain less aspect strength ratio, and this non-woven fabrics can replace the product of the cross lapping of part, enlarges the range of application and the field of direct lapping non-woven fabrics product, reduction in production cost improves production efficiency and product quality.

Description

Three-carding spunlaced non-woven fabric directly paved and preparation method thereof
Technical Field
The application relates to the technical field of non-woven fabric production, in particular to a three-carding spunlaced non-woven fabric directly paved with meshes and a preparation method thereof.
Background
The spunlaced nonwoven fabric is one of the nonwoven production methods, and the products thereof have wide application in the aspects of medical supplies, sanitary supplies, artificial leather base fabrics, clothing lining fabrics, decorative fabrics and the like. According to different forming modes, the spunlaced non-woven fabric production line can be divided into a direct-lapping spunlaced non-woven fabric production line and a cross-lapping spunlaced non-woven fabric production line.
The direct lapping hydro-entangled non-woven fabric production line is a production line which lays the fiber web output after one or more carding machines are connected in series or in parallel into a fiber web with a certain thickness and then outputs the fiber web for subsequent hydro-entangled reinforcement. The product obtained by the production line has the characteristics of good appearance and high uniformity, and the production speed can reach 160m/min-260m/min or higher. The production line has the characteristics of short flow, less equipment, small occupied area, high speed, low energy consumption, low cost, less labor, high investment income and the like, and is rapidly developed in China in recent years. However, because the fibers in the web are often aligned in the machine direction, the product has a large difference in strength between the machine and transverse directions, and thus its use is severely limited.
The cross-lapping spunlaced non-woven fabric production line is a production line which folds the fiber web carded by the carding machine transversely and uniformly into a fiber web with a certain width and thickness to be output and then to be consolidated by spunlacing through an independent cross lapping machine. The products obtained by the production line have small difference of transverse strength and longitudinal strength, uniform breaking strength in all directions and wide application, but have the disadvantages of low speed, low productivity, high cost and the like compared with the direct lapping water needling production line.
Disclosure of Invention
To solve the above technical problems, a first object of the present application is to provide a directly-laid three-carded spunlaced nonwoven fabric with small difference between transverse strength and longitudinal strength, and a second object of the present application is to provide a method for preparing the directly-laid three-carded spunlaced nonwoven fabric with improved production efficiency and product quality.
In order to achieve the first object, the present application adopts the following technical scheme: the three-carding spunlaced non-woven fabric comprises a first fiber layer, a third fiber layer and a second fiber layer located between the first fiber layer and the third fiber layer, wherein the second fiber layer comprises a plurality of fiber areas which are mutually spaced, the first fiber layer and the third fiber layer are hydrophilic fiber structure layers, the second fiber layer is a low-melting-point fiber structure layer, the second fiber layer is thermally fused and bonded at a plurality of the fiber areas, and the low-melting-point fiber structure layer is made of low-melting-point fibers.
In the above technical solution, it is further preferable that the hydrophilic fiber structural layer is made of one or more of cotton fiber, hemp fiber, viscose fiber, lyocell fiber, modal fiber, chitosan fiber, polylactic acid fiber and tencel fiber.
In the above technical solution, it is further preferred that the low-melting fiber is made of one or more of a low-melting monocomponent fiber and a low-melting multicomponent fiber.
In the above technical solution, it is further preferable that the aspect ratio of the nonwoven fabric is 2.0:1-1.5:1.
in the above technical solution, it is further preferable that the thickness of the second fiber layer is 0.5-2.0mm, and the porosity of the second fiber layer in the fiber area is 75% -90%.
In the above technical solution, it is further preferable that the said nothingThe square meter gram weight of the spinning cloth is 30-120g/m 2
In order to achieve the second purpose, the application adopts the following technical scheme: a method for preparing a three-carding spunlaced non-woven fabric directly paved,
step one: opening, namely respectively putting the fiber raw materials of the three fiber layers into three opening machines for opening, weighing and mixing;
step two: three carding and web forming processes, namely respectively putting three layers of fiber raw materials which are subjected to the opening process into three carding machines, and paving the fiber raw materials of a first fiber layer into a lower fiber web by a first carding machine; setting the laying length and the interval length of a second carding machine, wherein the second carding machine lays the fiber raw material of the second fiber layer on the lower fiber web at intervals to form an intermediate fiber web; the three carding machines lay the fiber raw materials of the third fiber layer on the middle fiber web to form an upper fiber web;
step three: a hydroentangling process, wherein the three-layer fiber web is reinforced by the hydroentangling process;
step four: a drying step of drying the web subjected to the hydroentanglement process;
step five: hot rolling, namely setting the temperature of a hot rolling mill, feeding the dried fiber web into the hot rolling mill, and bonding the fiber web of the upper layer and the lower layer after the fiber of the fiber web of the middle layer is hot melted to form a three-layer non-woven fabric;
step six: and a packaging step of packaging the nonwoven fabric.
In the above technical solution, it is further preferable that, in the three carding and web forming process, the second carding machine directly spreads the fiber raw material of the second fiber layer by the spreading length according to the spreading length, cuts off the fiber raw material, and then, after passing the interval length, re-spreads the fiber raw material of the second fiber layer, and webs the fiber raw material at periodic cycle intervals.
In the above technical scheme, it is further preferable that in the drying process, the drying temperature is 80 ℃ to 100 ℃.
In the above technical scheme, it is further preferable that in the hot rolling step, the temperature set by the hot rolling mill is 120 ℃ to 140 ℃.
Compared with the prior art, the application has the following beneficial effects:
according to the method, the second fiber layer which can be bonded through hot melting is arranged between the first fiber layer and the third fiber layer, and fiber raw materials of the second fiber layer are paved at intervals, so that the non-woven fabric does not adopt a cross lapping process, the tensile breaking strength in all directions can be improved, the difference of longitudinal and transverse strength is reduced, the non-woven fabric can replace a part of cross lapping product, and the application range and the application field of a non-woven fabric product of direct lapping are enlarged.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
fig. 2 is a flow chart of a preparation method of the present application.
Detailed Description
In order to describe the technical content, constructional features, objects and effects of the application in detail, the technical solutions of the embodiments of the application will be described in conjunction with the accompanying drawings in the embodiments of the application, and it is apparent that the described embodiments are only some embodiments of the application, not all embodiments. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Furthermore, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.
Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Furthermore, spatially relative terms such as "under … …," "lower," "over … …," "upper," and the like are used herein to describe one element's relationship to another element(s) as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation and/or manufacture in addition to the orientation depicted in the figures.
In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium.
The application provides a three carding water thorn non-woven fabrics of direct lapping, as depicted in fig. 1, this water thorn non-woven fabrics includes first fibrous layer 1, third fibrous layer 3 and is located first fibrous layer 1 and third fibrous layer 3 between second fibrous layer 2, in this embodiment, first fibrous layer 1 is located the below, second fibrous layer 2 lays in first fibrous layer 1's top, third fibrous layer 3 lays in second fibrous layer 2's top, first fibrous layer 1, second fibrous layer 2 and third fibrous layer 3 stack gradually from lower supreme.
The first fiber layer 1 and the third fiber layer 3 are hydrophilic fiber structure layers, and have good water absorption performance; in this embodiment, the hydrophilic fibrous structure layer is made of one or more hydrophilic fibers including, but not limited to, cotton fibers, hemp fibers, viscose fibers, lyocell fibers, modal fibers, chitosan fibers, polylactic acid fibers and tencel fibers, which impart good water absorption and softness to the first fiber layer 1 and the third fiber layer 3, and are suitable as a surface layer of the article. The first fibre layer 1 and the third fibre layer 3 extend in the longitudinal direction under the straight lay of the carding machine.
The second fibre layer 2 comprises a number of mutually spaced fibre areas 21, with a spacing 22 of 10-100mm between two adjacent fibre areas 21, each fibre area 21 being spaced apart in the longitudinal direction under laying of the carding machine, and each fibre area 21 extending in a transverse direction perpendicular to the longitudinal direction, in this embodiment the first fibre layer 1, the second fibre layer 2 and the third fibre layer 3 being of uniform breadth.
The second fibrous layer 2 is a low-melting fibrous structure layer, and the second fibrous layer 2 is thermally fused to the first fibrous layer 1 and the third fibrous layer 3 at a plurality of fibrous regions 21. The second fiber layer 2 not only bonds the upper fiber layer and the lower fiber layer, but also improves the transverse strength of the whole non-woven fabric, so that the range of the aspect ratio of the non-woven fabric is 2:1-1.5:1, the cross-lapping water-jet nonwoven fabric can be used for replacing cross-lapping water-jet nonwoven fabric products in certain applications, and the application range and the field are widened. The second fiber layer 2 also has 75% -90% of porosity in the fiber area 21, and the higher porosity improves the air permeability of the second fiber layer 2 in the fiber area 21, so that the air permeability efficiency of the first fiber layer 1 and the third fiber layer 3 is ensured while the second fiber layer 2 is bonded with the first fiber layer 1 and the third fiber layer 3, and the non-woven fabric has high tensile strength and good air permeability.
The low-melting fiber structural layer is made of low-melting fibers, and the first fiber layer 1 and the third fiber layer 3 are bonded in a molten state at a temperature of 100 ℃ to 150 ℃. The low-melting point fibers are made from one or more of low-melting point monocomponent fibers and low-melting point multicomponent fibers; low melting point monocomponent fibers include, but are not limited to, low melting point polyolefin fibers, low melting point polyamide fibers, and low melting point polyester fibers; the low-melting point multi-component fiber has a sheath-core composite structure, the low-melting point multi-component fiber comprises a sheath layer and a core layer, the sheath layer is made of low-melting point single-component fiber, the melting point of the sheath layer is lower than that of the core layer, the sheath layer is in hot melting to bond adjacent low-melting point multi-component fibers, the melting point of the core layer is high, the fiber form is kept at the temperature of 100-150 ℃, and the supporting function is played between the first fiber layer 1 and the third fiber layer 3. In other embodiments, the low melting point fibers are made from a blend of low melting point monocomponent fibers and low melting point multicomponent fibers, two or more low melting point monocomponent fibers, or two or more low melting point multicomponent fibers.
The application also provides a preparation method of the three-carding spunlaced non-woven fabric directly paved, as shown in fig. 2, the preparation method comprises the following steps:
step one: opening, namely respectively putting the three layers of fiber raw materials into three opening machines for opening, weighing and mixing;
step two: three carding and web forming processes, namely respectively putting three layers of fiber raw materials which are subjected to the opening process into three carding machines, and paving the fiber raw materials of the first fiber layer 1 into a lower fiber web by using a first carding machine; setting the laying length and the interval length of a second carding machine, wherein the second carding machine lays the fiber raw material of the second fiber layer 2 on the lower fiber web at intervals to form an intermediate fiber web; the three carding machines lay the fiber raw materials of the third fiber layer 3 on the middle fiber web to form an upper fiber web;
step three: a hydroentangling process, wherein the three-layer fiber web is reinforced by the hydroentangling process;
step four: a drying step of drying the web subjected to the hydroentanglement process;
step five: hot rolling, namely setting the temperature of a hot rolling mill, feeding the dried fiber web into the hot rolling mill, and bonding the fiber web of the upper layer and the lower layer after the fiber of the fiber web of the middle layer is hot melted to form a three-layer non-woven fabric;
step six: and a packaging step of packaging the nonwoven fabric.
In the three carding and web forming process, the two carding machines directly lay the fiber raw material of the second fiber layer 2 on the lower fiber web according to the laying length, and cut off the fiber web after the preset laying length to form a fiber area 21; the lower web is moved a predetermined gap length to form a gap 22; after the interval length is equal, the second carding machine lays the fiber raw material of the second fiber layer 2 on the lower fiber net again, and the fiber raw material is paved at intervals in a periodic circulation mode; the interval length of the two carding machines for direct laying is preset according to the sizes of different products, and the interval length is 10-100mm.
In the drying procedure, the drying temperature is 80-100 ℃; in the hot rolling process, the temperature set by the hot rolling mill is 120-140 ℃.
After the three-layer fiber web is subjected to the hot rolling process, the low-melting-point fibers of the middle-layer fiber web are heatedAnd (3) fusing and bonding the upper and lower fiber webs to enable the aspect ratio of the non-woven fabric to be 2.0:1-1.5:1, the tensile strength of the non-woven fabric in all directions is improved; the fiber laid in the middle of the second fiber layer 2 does not increase much weight based on the mass of the two fiber layers, the thickness of the non-woven fabric after hot rolling is reduced, the thickness of the second fiber layer 2 is 0.5-2.0mm, and the gram weight of the non-woven fabric in square meter is 30-120g/m 2 The non-woven fabric is light, thin and soft, and is convenient for producing disposable sanitary products.
The second fiber layer 2 laid at intervals strengthens the tensile breaking strength of the non-woven fabric in the transverse direction after hot rolling in the fiber area 21, so that the aspect strength ratio of the non-woven fabric is close to that of the non-woven fabric laid in a cross manner, the characteristics of small occupied area, high speed and low energy consumption and cost are maintained by directly laying, meanwhile, the directly laid product has the characteristic of small aspect strength ratio of the non-woven fabric laid in the cross manner, the tensile breaking strength of the non-woven fabric in all directions is improved, and the product quality is improved.
According to the method, the second fiber layer 2 capable of being bonded through hot melting is arranged between the first hydrophilic fiber layer 1 and the third fiber layer 3, and fiber raw materials of the second fiber layer 2 are paved at intervals, so that the non-woven fabric does not adopt a cross lapping process, the tensile breaking strength in all directions can be improved, the non-woven fabric can replace a product with partial cross lapping, and the application range and the field of a non-woven fabric product with direct lapping are enlarged.
The foregoing has outlined and described the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the present application is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined in the appended claims, specification and their equivalents.

Claims (8)

1. A three-carding water-jet non-woven fabric directly paved, which is characterized by comprising a first fiber layer (1), a third fiber layer (3) and a third fiber layer (1) and a third fiber layerA second fiber layer (2) between fiber layers (3), wherein the first fiber layer (1), the second fiber layer (2) and the third fiber layer (3) are formed by water needling and hot rolling after being laid, the second fiber layer (2) comprises a plurality of fiber areas (21) which are mutually separated, a distance (22) of 10-100mm is arranged between two adjacent fiber areas (21), each fiber area (21) is distributed at intervals along the longitudinal direction under the laying of a carding machine, each fiber area (21) extends along the transverse direction, the first fiber layer (1) and the third fiber layer (3) are hydrophilic fiber structure layers, the second fiber layer (2) is a low-melting-point fiber structure layer, the second fiber layer (2) is thermally fused at a plurality of fiber areas (21) and is bonded with the first fiber layer (1) and the third fiber layer (3), the low-melting-point fiber structure layer is made of a non-woven fabric with the second fiber area (21) of 0.5-0 m/2 m, and the second fiber area (2-2) is 0.0-5 g/m (0-5 g/2 m-0 g) of the fiber layer is formed by the non-woven fabric 2
2. The directly laid three-card spunlaced nonwoven fabric of claim 1, wherein the hydrophilic fibrous structure layer is made of one or more of cotton fibers, hemp fibers, viscose fibers, lyocell fibers, modal fibers, chitosan fibers, polylactic acid fibers and tencel fibers.
3. The direct laid tri-carded hydroentangled nonwoven according to claim 1, wherein said low-melt fibers are made from one or more of low-melt monocomponent fibers and low-melt multicomponent fibers.
4. The directly-laid three-card hydroentangled nonwoven according to claim 1, wherein the aspect ratio of said nonwoven is 2.0:1-1.5:1.
5. a method for preparing a directly-lapped three-carded spunlaced nonwoven fabric, which is applicable to the directly-lapped three-carded spunlaced nonwoven fabric as claimed in any one of claims 1 to 4, and is characterized in that,
step one: opening, namely respectively putting the fiber raw materials of the three fiber layers into three opening machines for independent opening, weighing and mixing;
step two: three carding and web forming processes, namely respectively putting three layers of fiber raw materials which are subjected to the opening process into three carding machines, and paving the fiber raw materials of the first fiber layer (1) into a lower fiber web by using a first carding machine; setting the laying length and the interval length of a second carding machine, wherein the second carding machine lays the fiber raw material of the second fiber layer (2) on the lower fiber web at intervals to form an intermediate fiber web; the three carding machines lay the fiber raw materials of the third fiber layer (3) on the middle fiber web to form an upper fiber web;
step three: a hydroentangling process, wherein the three-layer fiber web is reinforced by the hydroentangling process;
step four: a drying step of drying the web subjected to the hydroentanglement process;
step five: hot rolling, namely setting the temperature of a hot rolling mill, feeding the dried fiber web into the hot rolling mill, and bonding the fiber web of the upper layer and the lower layer after the fiber of the fiber web of the middle layer is hot melted to form a three-layer non-woven fabric;
step six: and a packaging step of packaging the nonwoven fabric.
6. The method according to claim 5, wherein in the three carding step, the second carding machine directly spreads the fiber raw material of the second fiber layer (2) by the spreading length and cuts the fiber raw material, and after passing the interval length, the fiber raw material of the second fiber layer (2) is spread again to be spread at periodic cycle intervals.
7. The method for preparing a directly lapping three-card spunlaced nonwoven fabric according to claim 5, wherein in the drying process, the drying temperature is 80-100 ℃.
8. The method for producing a directly lapped three-card spunlaced nonwoven fabric as recited in claim 5, wherein the hot rolling mill is set at a temperature of 120 ℃ to 140 ℃ in the hot rolling process.
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