CN112746394A - Inclined-net-forming online spun-bonded spunlace composite non-woven fabric and preparation method thereof - Google Patents
Inclined-net-forming online spun-bonded spunlace composite non-woven fabric and preparation method thereof Download PDFInfo
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- CN112746394A CN112746394A CN202011577885.3A CN202011577885A CN112746394A CN 112746394 A CN112746394 A CN 112746394A CN 202011577885 A CN202011577885 A CN 202011577885A CN 112746394 A CN112746394 A CN 112746394A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING 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
- D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
- D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
- D04H5/03—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling by fluid jet
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING 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
- D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
- D04H5/06—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns
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Abstract
The invention discloses an inclined-wire-forming online spun-bonded spunlace composite non-woven fabric which comprises an online wet inclined-wire-forming first fiber layer and an online spun-bonded web-forming second fiber layer, and is formed by superposing and spunlacing the first fiber layer and the second fiber layer. The invention has the advantages of high friction adsorption capacity, good liquid absorption and strong dirt-removing power, can be prepared by on-line spun-bonding in the production process, has simple and convenient process, greatly saves energy consumption, reduces material loss and production cost, and can be customized according to the terminal use requirement due to the controllability of the spun-bonding consolidation.
Description
Technical Field
The invention relates to the technical field of spunlace non-woven fabrics, in particular to an inclined-net-forming online spun-bonded spunlace composite non-woven fabric and a preparation method thereof.
Background
The existing PP spun-bonded composite wood pulp spunlace non-woven fabric is widely applied to the fields of industrial wiping materials, kitchen wiping materials, wet tissues and the like due to good wiping strength and good liquid absorption and decontamination capability. The production process mainly comprises two production processes, and the two production processes are both manufactured in an off-line secondary forming processing mode.
One process is to make PP spun-bonded cloth and wood pulp paper separately off-line, then to unwind by an unwinder, to laminate the two layers of materials, to entangle and reinforce them into a whole by a spunlace process, to make PP wood pulp spunlace cloth.
The other process is that the PP slices are firstly melted and extruded at high temperature by a screw extruder, filtered, metered, spun, cooled and drafted, laid into a net, thermally bonded and reinforced to form PP spunbonded fabric, and then coiled to be a package material. And secondly, wood pulp is broken into fibers and made into fiber suspension, the fiber suspension is conveyed to a wet forming machine to be dewatered to form a net, the rolled PP spun-bonded cloth is synchronously uncoiled through an uncoiler and conveyed to the upper layer or the lower layer of the wet net to be superposed with the wet net, and the PP spun-bonded cloth and the wet wood pulp layer are entangled, reinforced and compounded into a whole through a spunlace process to make the PP wood pulp spunlace cloth.
Application No. 201811459800.4 discloses a coarse grain wet process composite nonwoven fabric, which comprises a wet process wood pulp cellulose layer I, a wet process wood pulp cellulose layer II and a spun-bonded nonwoven fabric layer. The preparation method comprises the following specific steps of (1) enabling cellulose short fibers to enter a wet pulp distribution device through a pulp preparation system and then enter wet web forming equipment; (2) conveying the spun-bonded non-woven fabric to the front of wet-laid web by an unwinding device, and carrying out primary compounding with wet wood pulp; (3) the compounded wood pulp spun-bonded composite cloth is released by unwinding equipment to be conveyed to a wet-laid state for secondary wood pulp compounding to form a three-layer structure, and coarse grains are formed on the cloth surface through the arrangement of a spunlace process; (4) and (4) after dehydration and drying, winding and slitting to finish the production process of the coarse grain wet process composite non-woven fabric.
Application number 201410847273.X discloses a waterproof lock water microbubble facial mask non-woven fabrics of one side water absorption one side, characterized by: 5mm cellulose fiber with the fineness of less than or equal to 0.9 dtex is formed by spunlace compounding with a PP hydrophobic layer; the PP hydrophobic layer is PP spunbonded fabric, and each square meter of the PP hydrophobic layer is 5-15 g. The manufacturing method is characterized in that: the PP hydrophobic layer is covered on the wet fiber net after being uncoiled, the hydro-entangled head on the hydro-entangled machine carries out positive and negative multi-channel water pressure on the wet fiber net and the PP hydrophobic layer on the flexible trawl curtain, generally 2-5Mpa, the number of hydro-entangled channels is 5-7 low pressure increasing hydro-entangled, and the fine denier short fiber cellulose fiber in the hydro-entangled wet fiber net is directly entwined and clasped along with the traveling direction of the compact flexible trawl curtain, namely the moving process from an outlet of the compact flexible trawl curtain to a finished product area, the fine denier short fiber cellulose fiber in the compact flexible trawl curtain is sequentially raised from 2 Mpa to 5Mpa, so that the waterproof skin-adhering mask non.
The defects of the proposal are that off-line spunbonded fabric (or PP hydrophobic layer) unwinding equipment is adopted to unwind and convey the spunbonded fabric (or PP hydrophobic layer) to the wet-laid layer, and then the spunbonded fabric (or PP hydrophobic layer) is superposed with the wet-laid fiber layer and is combined into a whole through spunlace entanglement. The process needs to be finished by secondary forming processing, the process waste of rewinding the spun-bonded fabric (or PP hydrophobic layer) roll is caused, the spun-bonded fabric (or PP hydrophobic layer) roll also needs to be replaced, the waste of scrapped materials of products is generated during replacement, and the cost is high; the process can not adjust the bonding degree and the size of bonding points of the spunbonded fabric according to the characteristics of the final product and the process requirements, and the process adjustment is passive; in the process, due to the reason of thermal bonding and reinforcement of the spunbonded fabric, the structure of the spunbonded fabric is compact, wet fibers cannot completely and effectively penetrate into the internal structure of the spunbonded fabric, so that the entanglement and the compounding are insufficient, and the final product is easy to layer.
Application number 201810025487.7 discloses a wet-process multifunctional high-speed spunlace composite production line and spunlace non-woven fabrics obtained by production, the composite production line comprises a web forming device, a multi-stage spunlace device, a vacuum negative pressure suction device, a high-efficiency water rolling vehicle, a first-stage composite drying device, a flat-web spunlace device or a rotary drum spunlace device, a first flat calender, a rotary disc spray coating finishing device, a rotary disc spray dyeing device, a printing device, a second-stage drying device, a second flat calender, a third-stage drying device, a third flat calender and a post-finishing device which are sequentially arranged, and the composite production line further comprises a material returning and unwinding device or a spunbond fiber online web forming device. Paragraph 50 mentions that alternatively there is provided an in-line spunbonding device 16 downstream of the discharge of the web forming device 1 and downstream of the multi-stage hydroentangling device 2, the spunbond fiber in-line-laying apparatus provided herein can form a spunbond web in-line, in this particular embodiment using a spunbond filament polypropylene fiber in-line-laying apparatus, the spun-bonded polypropylene fiber net produced on line can be superposed with the fiber layer formed by the net forming device at the upper end, the spun-bonded fibers enter a subsequent multi-stage spunlace device together for spunlace composition, and are immediately subjected to composite spunlace with a fiber layer formed by a web forming device after the spun-bonded fibers are produced on line, compared with the material obtained by compounding the polypropylene cloth prepared by the traditional process with the fiber layer formed by the online web forming device through material returning and unreeling, the production cost of the product can be reduced, and the bulkiness of the composite product is more excellent.
The defects of the scheme are that the polypropylene spun-bonded fiber web is formed on line by utilizing the spun-bonded fiber online netting device, and the polypropylene spun-bonded fiber web is directly overlapped with the fiber layer formed by the netting device at the upper end up and down without consolidation and then enters the subsequent multi-stage spunlace device together for spunlace compounding. However, the polypropylene fiber does not absorb water basically because the moisture regain of the polypropylene fiber is 0 percent, and therefore cannot directly absorb the energy of the hydro-acupuncture for entanglement, and the hydro-entangled composite non-woven fabric obtained by the scheme is basically in a loose and fluffy state without a post-finishing mode and has no using strength, so that post-finishing processes such as flattening calendering, rotary disc spray coating finishing and the like are required for reinforcement. However, the flat calendering is basically realized in a whole-surface calendering way, so that the point bonding cannot be realized, the product thickness is reduced, and the product is relatively hardened. The coating finishing is not environment-friendly enough, and the mode can not obtain the characteristics of high dirt removing capacity and the like required by the optimal wiping material, but wastes the energy consumption of the spunlace.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the technical scheme adopted by the invention for solving the technical problem is as follows: an inclined-net-forming online spun-bonded spunlace composite non-woven fabric comprises a first fiber layer and a second fiber layer, wherein the first fiber layer and the second fiber layer are laminated to form the inclined-net-forming wet fiber net layer, the second fiber layer is a spun-bonded fiber net layer, the first fiber layer is made of 20-100% by mass of wood pulp fibers and 0-80% by mass of cellulose fibers, the second fiber layer is made of 100% by mass of synthetic fibers, thermal bonding areas and non-bonding fluffy areas are distributed in the second fiber layer, fibers of the first fiber layer penetrate into the non-bonding fluffy areas at corresponding positions of the second fiber layer and are mutually entangled with the fibers of the second layer, a plurality of through holes penetrating through the first fiber layer are further distributed on the surface of the first fiber layer, a plurality of point-like raised grains or stripe-like raised grains are further distributed on the surface of the first fiber layer, or a block-shaped raised texture.
Preferably, a plurality of exposed fibers formed by the first fiber layers in an inserting mode are distributed on the surface of the second fiber layer, and the exposed fibers are mainly distributed in a plush shape.
Preferably, the beating degree of the wood pulp in the first fiber layer is 10-20 DEG SR, the cellulose fiber in the first fiber layer is one or any combination of natural cotton fiber, viscose fiber, lyocell fiber and bamboo fiber, the fineness of the cellulose fiber in the first fiber layer is 0.3-3.5 dtex, and the length of the cellulose fiber in the first fiber layer is 3-15 mm.
Preferably, the synthetic fibers in the second fiber layer are one or any combination of polypropylene fibers, polyester fibers and polylactic acid fibers, the synthetic fibers in the second fiber layer are filaments, and the second fiber layer is consolidated through heat bonding to form a plurality of uniform and separate consolidation points.
Preferably, the shape of the consolidation point is circular, oval, diamond, square, rectangle, hexagon, rice grain, strip, cross.
Preferably, the maximum diagonal length of the consolidation point is 0.1-10 mm, and the area ratio of the consolidation point is 10-40%.
Preferably, the total area of the through holes of the first fiber layer is 5-40% of the area of the top surface of the first fiber layer.
Preferably, the first fiber layer is an online wet inclined-wire-formed fiber net layer, the second fiber layer is an online spun-bonded web-formed fiber net layer, and the unit area mass of the online spun-bonded spunlace composite non-woven fabric formed by inclined wires is 25-120 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 10-20 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 0.2-1.5%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former through a fan pump, dewatering to form a net to prepare a first fiber layer, conveying to a circulating conveying curtain, and placing on a second fiber layer;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spinning assembly for spinning, cooling and drafting continuous filaments, and paving the filaments on a forming net to form a net structure;
(5) the polymer filament fiber net is thermally bonded and consolidated according to the process requirements to form a second fiber layer, and the second fiber layer is conveyed to the circulating conveying curtain and is arranged below the first fiber layer;
(6) superposing a first fiber layer and a second fiber layer, then introducing the superposed fiber web onto a spunlace web supporting curtain, carrying out 4-12 front side spunlace and 2-4 back side spunlace on the superposed fiber web by using a spunlace process, carrying out the front side spunlace so that the fibers of the first fiber layer are interpenetrated and implanted into the second fiber layer, combining the fibers with the fibers of the second fiber layer into a whole after being entangled, and forming punctate convex grains, or stripe convex grains, or blocky convex grains on the surface of the second fiber layer by the back side spunlace;
(7) and (3) removing water from the spunlaced material by vacuum suction or a drying roll, drying and coiling to prepare the inclined-net forming online spun-bonded spunlaced composite non-woven fabric of 25-120 g/square meter.
Preferably, the forming concentration of the fiber suspension sent into the inclined wire former in the step (3) is 0.02-0.05%, the inclined wire former in the step (3) further comprises an absorption and release water tank and a couch roll, 1-3 groups of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, in the steps (3) and (5), a negative pressure suction device is arranged below an inlet of a circulating conveying curtain, a first fiber layer is peeled from the inclined wire through suction, the first fiber layer is tightly attached to a second fiber layer, the first fiber layer and the second fiber layer are synchronously conveyed to the next process on the conveying curtain, in the step (6), a flat net hydro-entangling head is adopted to carry out multi-channel hydro-entangling on the front side of the two superposed fiber layers, and then a round drum hydro-entangling head is adopted to carry out multi; wherein the pressure of the front side spunlace head is increased by 10-110 bar, the pressure of the first spunlace head is 10-30 bar for pre-entanglement, and then the pressure of the spunlace head is increased by 30-110 bar for composite entanglement; the reverse spunlace pressure is 30-100 bar, the spunlace net of the reverse spunlace drum in the step (6) is provided with 0.3-5 mm holes, the aperture ratio is 7-47%, dot-shaped raised grains or block-shaped raised grains are formed on the surface of the first fiber layer, or the spunlace net of the spunlace drum is in a single-layer or double-layer woven structure of 0.2-1 mm steel wires, strip-shaped raised grains are formed on the surface of the first fiber layer by matching with the spunlace grains, and the drying mode in the step (7) is a hot air penetrating type.
The invention has the beneficial effects that:
1. the beating degree of the wood pulp in the first fiber layer is 10-20 degrees SR, the appropriate beating degree can smoothly dehydrate during inclined net dehydration forming, and the higher the beating degree is, the poorer the dehydration effect is, so that the processing speed and the net forming uniformity are influenced; the appropriate beating degree reflects the fibrillation degree of the wood pulp, the more sufficient fibrillation is, the more hydrogen bonds among fibers are, the higher the dry strength of the final product is, and the more the wood pulp is difficult to fall off to form flocs;
2. the second fiber layer is consolidated by thermal bonding, the shape, size and consolidation degree of consolidation points can be adjusted, if the second fiber layer is not consolidated at all, a loose fiber net structure is presented, no bonding points exist, and the fibers of the first fiber layer can be completely covered, interpenetrated, implanted and filled in the second fiber layer, so under the condition of the same fiber mass ratio, the wiping friction force is smaller, the using strength is extremely low, the wiping requirement cannot be met, therefore, the second fiber layer is not adopted, if the second fiber layer is consolidated by slight thermal bonding, or the maximum diagonal length of the consolidation points is less than 0.3mm, the consolidation ratio area ratio is 10-20%, most of the fibers present a non-consolidation fluffy state, the fibers of the first fiber layer can be interpenetrated, implanted and filled in the second fiber layer, the second fiber layer also provides a certain strength, and the strength is superior to the completely non-consolidation state, if the second fiber layer is solidified through conventional heat bonding, the maximum diagonal length of a solidification point is 0.3-1.5 mm, the area of the solidification rate accounts for 20-40%, the second fiber layer provides better strength, but the quantity of fibers of the first fiber layer inserted into the second fiber layer is reduced, more through holes are formed, the wiping friction force is enhanced, stubborn stains can be effectively removed, when the solidification shape is a rice grain shape, a long strip shape or a cross shape, the maximum diagonal length does not exceed 10mm, the area of the solidification rate does not exceed 25%, otherwise the softness of a final product can be influenced, the second fiber layer is solidified through heat bonding, the shape and the size of the solidification point and the solidification degree can be adjusted according to the requirements of a final use scene and performance, and the specific performance of the product has pertinence;
3. because the second fiber layer has a thermal bonding and consolidation area and a non-consolidation fluffy area, the fibers of the first fiber layer are inserted into the non-consolidation fluffy area of the second fiber layer under the action of water jet and are entangled with the fibers of the second fiber layer, but because the thermal bonding and consolidation area of the second fiber layer is compact and firm, the fibers of the first fiber layer which is originally positioned at the upper layer of the thermal bonding and consolidation area can not enter the thermal bonding and consolidation area of the second fiber layer, but the fibers are displaced into the nearby non-consolidation fluffy area under the action of water power, so that through holes are formed on the surface of the first fiber layer, the roughness of the surface is increased by the through holes, the wiping friction is increased, the dirt removing and holding capacity is improved in the wiping process, the smaller the area ratio of the through holes is, the lower the friction is, and the;
4. because a plurality of punctiform raised grains, or stripe-shaped raised grains, or block-shaped raised grains are distributed on the surface of the first fiber layer, the grains effectively increase the specific surface area of the first fiber layer, increase the friction force and improve the wiping effect;
5. because the surface of the second fiber layer is distributed with a plurality of exposed fibers formed by the first fibers in an interpenetration mode, the exposed fibers are distributed mainly in an end head plush shape, the slippery feeling of the surface (spun-bonded surface) of the second fiber layer can be effectively reduced, the adsorbability is improved, and the liquid absorption capacity and the decontamination capacity are improved;
6. when the raw material of the first fiber net layer contains cellulose fiber, the fineness is 0.3-3.5 dtex, the length is 3-15 mm, compared with wood pulp fiber, due to the fact that the fiber length is long and the length-diameter ratio is large, good dispersion and forming can be achieved only by highly diluting a fiber suspension, the forming concentration is generally 0.02-0.05%, and due to the adoption of an inclined wire former, the cellulose fiber can be enabled to be in a suspended state when being meshed with a net to prevent flocculation, the horizontal wire former has the dewatering capacity of a flat wire machine which is 5-7 times as long as the length, and the dewatering requirement of the meshed with the net with extremely low concentration can be met. In addition, because the inclined wire former deposits the fibers on the wire by the vacuum suction effect during the forming process, the fiber arrangement has no obvious directionality during the forming process, so that the first fiber layer manufactured has small strength difference in the longitudinal direction and the transverse direction;
7. sending a fiber suspension mixed with wood pulp fibers and cellulose fibers into an inclined wire former through a fan pump, wherein the fiber suspension needs to be subjected to net feeding and dewatering forming in sequence, the initial section of a forming area is slowly dewatered to enable the fibers to be fully unfolded and formed, and the dryness of a fiber net needs to be quickly dewatered in the later stage to improve the dryness of the fiber net, so that the fiber net is convenient to discharge, therefore, the opening degree of a first water leg of the inclined wire former is 60-72%, the opening degree of a second water leg is 70-88%, the opening degree of a third water leg is 85-95%, the opening degree of a fourth water leg is 90-100%, and the opening degree of a fifth water leg is 100;
8. the drying mode adopts hot air penetration type drying, and the spunlace nonwoven material is usually dried by adopting two modes of a drying cylinder type and a hot air penetration type.
In conclusion, the invention has the advantages of strong adsorption capacity, good liquid absorption capacity and high decontamination capacity, and can be prepared by on-line spun-bonding in the production process, so that the process is simple and convenient, the energy consumption is greatly saved, and the cost is reduced.
Description of the drawings:
FIG. 1 is a process flow diagram of an inclined wire forming on-line spun-bonded spunlace composite non-woven fabric;
FIG. 2 is a schematic cross-sectional structure of an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric;
FIG. 3 is a schematic top view of a first fiber layer of a spunlace composite nonwoven fabric formed by inclined wire forming and spun-bonded on line;
FIG. 4 is a schematic top view of a striped protrusion of a first fiber layer of an inclined-wire formed on-line spun-bonded spunlace composite nonwoven fabric;
FIG. 5 is a schematic top view of a first fiber layer block-shaped protrusion of a spunlace composite nonwoven formed by inclined wire on-line spunbonding;
FIG. 6 is a schematic view of an apparatus for producing an inclined wire spun-bonded spunlace composite nonwoven fabric;
in the figure, a first fiber layer 1, a second fiber layer 2, a through hole 3, a bulge 4, a spun-bonding machine 5, a spun-bonding forming net 6, a hot rolling machine 7, an inclined net former 8, a circulating conveying curtain 9, a negative pressure suction device 10, a spun-bonding net supporting curtain 11, a spun-bonding round drum 12, a spun-bonding head 13, a cloth guide roller 14, a vacuum suction dehydration device 15, a rolling drying dehydration device 16, a drying machine 17 and a lap former 18.
Detailed Description
The present invention is further illustrated by the following examples, but is not limited to the details of the description.
Example 1: referring to fig. 1 to 6, an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric comprises a first fiber layer 1 and a second fiber layer 2, the first fiber layer 1 is a wet inclined net forming fiber net layer, the second fiber layer 2 is a spun-bonded web forming fiber net layer, the first fiber layer 1 is made of wood pulp fibers with the mass percent of 100%, the second fiber layer 2 is made of synthetic fibers with the mass percent of 100%, heat bonding areas and non-bonding fluffy areas are distributed in the second fiber layer 2, the fibers of the first fiber layer 1 penetrate into the non-bonding fluffy areas at the corresponding positions of the second fiber layer 2 and are mutually entangled with the fibers of the second layer, a plurality of through holes 3 penetrating through the first fiber layer 1 are further distributed on the surface of the first fiber layer 1, and a plurality of striped protrusions 4 are further distributed on the surface of the first fiber layer 1.
The surface of the second fiber layer 2 is distributed with a plurality of bare fibers formed by the first fiber layer 1 in an inserting way, and the bare fibers are mainly distributed in a plush shape.
The degree of beating of wood pulp in the first fibrous layer 1 was 10 ° SR.
The synthetic fibers in the second fiber layer 2 are polypropylene fibers, the synthetic fibers in the second fiber layer 2 are filaments, and the second fiber layer 2 is consolidated through heat bonding to form a plurality of uniform and separate consolidation points.
The shape of the consolidation point is a rhombus.
The maximum diagonal length of the fixed point is 0.4mm, and the area percentage of the fixed point is 12%.
The sum of the areas of the through holes 3 of the first fiber layer 1 is 10% of the area of the top surface of the first fiber layer 1.
The first fiber layer 1 is a fiber net layer formed by an online wet inclined net, the second fiber layer 2 is a fiber net layer formed by online spun-bonded web, and the unit area mass of the spun-bonded spunlace composite non-woven fabric formed by the inclined net and formed by online spun-bonded is 25 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 10 DEG SR;
(2) the wood pulp fiber suspension is diluted, purified and screened, and then is sent to an inclined wire former 8 through a fan pump, is dewatered and laid into a net to prepare a first fiber layer 1, and is conveyed to a circulating conveying curtain 9 and is arranged on a second fiber layer 2;
(3) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spunbond machine 5 for spinning, cooling and drafting continuous filaments, and paving the filaments on a spunbond forming net 6 to form a net-shaped structure;
(4) the polymer filament fiber web is thermally bonded and consolidated through a hot rolling mill 7 according to the process requirements to form a second fiber layer 2, and the second fiber layer 2 is conveyed to an endless conveying curtain 9 and is arranged below the first fiber layer 1;
(5) superposing the first fiber layer 1 and the second fiber layer 2, introducing the superposed fiber webs onto a spunlace web supporting curtain 11, carrying out 4-pass front-side and 2-pass back-side spunlacing on the superposed fiber webs by using a spunlace process, carrying out the front-side spunlacing so that the fibers of the first fiber layer 1 are interpenetrated and implanted into the second fiber layer 2, combining the fibers with the fibers of the second fiber layer 2 into a whole after being intertwined, and forming striped convex 4-lines on the surfaces of the second fiber layer 2 by back-side spunlacing;
(6) removing water from the spunlaced material by a vacuum suction dehydration device 15 and a rolling drying dehydration device 16, and making the spunlaced material into an inclined wire forming online spun-bonded spunlaced composite non-woven fabric of 25 g/square meter by a drying machine 17 and a lap former 18.
The forming concentration of the fiber suspension fed into the inclined wire former 8 in the step (2) is 0.05 percent, the inclined wire former 8 in the step (2) further comprises an absorption and release water tank and a couch roll, 1 group of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, a negative pressure suction device 10 is arranged below an inlet of a circulating conveying curtain 9 in the steps (2) and (4), a first fiber layer 1 is peeled from the inclined wire through suction, is closely attached to a second fiber layer 2, and is synchronously conveyed to the next process on the conveying curtain together with the second fiber layer 2, in the step (5), a flat-screen hydro-entangled head 13 is adopted to carry out multi-channel hydro-entangling on the front side of the two overlapped fiber layers, and then a round drum hydro-entangled head 13 is adopted to carry out multi-channel hydro-entangling on the back side of the; wherein the pressure of the front side spunlace heads 13 is increased progressively by 10-50 bar, the pressure of the first spunlace head 13 is 10bar for pre-entanglement, the pressure of the second spunlace head 13 is 30bar, the pressure of the third spunlace head 13 is 40bar, and the pressure of the fourth spunlace head 13 is 50bar for composite entanglement; the reverse side spunlace pressure is 45bar and 30bar in sequence, the spunlace net of the reverse side spunlace circular drum 12 in the step (5) is in a 0.3mm steel wire double-layer weaving structure, the spunlace lines are matched to form strip-shaped bulges 4 lines on the surface of the first fiber layer 1, and the drying mode in the step (6) is a hot air penetration type.
Example 2: referring to fig. 1 to 6, an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric comprises a first fiber layer 1 and a second fiber layer 2, the first fiber layer 1 is a wet inclined net forming fiber net layer, the second fiber layer 2 is a spun-bonded web forming fiber net layer, the first fiber layer 1 is made of 20% by mass of wood pulp fibers and 80% by mass of cellulose fibers, the second fiber layer 2 is made of 100% by mass of synthetic fibers, thermal bonding areas and non-bonding fluffy areas are distributed in the second fiber layer 2, the fibers of the first fiber layer 1 penetrate into the non-bonding fluffy areas at the corresponding positions of the second fiber layer 2 and are mutually entangled with the fibers of the second layer, a plurality of through holes 3 penetrating through the first fiber layer 1 are further distributed on the surface of the first fiber layer 1, and a plurality of block-shaped texture protrusions 4 are further distributed on the surface of the first fiber layer 1.
The surface of the second fiber layer 2 is distributed with a plurality of bare fibers formed by the first fiber layer 1 in an inserting way, and the bare fibers are mainly distributed in a plush shape.
The degree of beating of wood pulp in the first fibre layer 1 is 20 SR, and the cellulose fibre in the first fibre layer 1 is viscose, and the cellulose fibre fineness in the first fibre layer 1 is 0.3dtex, and the cellulose fibre length in the first fibre layer 1 is 5 mm.
The synthetic fibers in the second fiber layer 2 are polyester fibers, the synthetic fibers in the second fiber layer 2 are filaments, and the second fiber layer 2 is consolidated through heat bonding to form a plurality of uniform and separate consolidation points.
The shape of the consolidation point is an ellipse.
The maximum diagonal length of the fixed point is 3mm, and the area ratio of the fixed point is 28%.
The sum of the areas of the through holes 3 of the first fiber layer 1 is 23% of the area of the top surface of the first fiber layer 1.
The first fiber layer 1 is a fiber net layer formed by an online wet inclined net, the second fiber layer 2 is a fiber net layer formed by online spun-bonded web, and the unit area mass of the spun-bonded spunlace composite non-woven fabric formed by the inclined net and formed by online spun-bonded is 120 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 20 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 0.2%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former 8 through a fan pump, dehydrating to form a net to prepare a first fiber layer 1, conveying to a circulating conveying curtain 9, and placing on a second fiber layer 2;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spunbond machine 5 for spinning, cooling and drafting continuous filaments, and paving the filaments on a spunbond forming net 6 to form a net-shaped structure;
(5) the polymer filament fiber web is thermally bonded and consolidated through a hot rolling mill 7 according to the process requirements to form a second fiber layer 2, and the second fiber layer 2 is conveyed to an endless conveying curtain 9 and is arranged below the first fiber layer 1;
(6) superposing the first fiber layer 1 and the second fiber layer 2, introducing the superposed fiber webs onto a spunlace web supporting curtain 11, carrying out 12 front-side spunlace and 4 back-side spunlace on the superposed fiber webs by using a spunlace process, carrying out the front-side spunlace so that the fibers of the first fiber layer 1 are interpenetrated and implanted into the second fiber layer 2, combining the fibers with the fibers of the second fiber layer 2 into a whole after being intertwined, and forming blocky raised 4 lines on the surfaces of the second fiber layer 2 by the back-side spunlace;
(7) removing water from the spunlaced material by a vacuum suction dehydration device 15 and a rolling drying dehydration device 16, and making the spunlaced material into an inclined wire forming online spun-bonded spunlaced composite non-woven fabric of 120 g/square meter by a drying machine 17 and a lap former 18.
The forming concentration of the fiber suspension fed into the inclined wire former 8 in the step (3) is 0.02%, the inclined wire former 8 in the step (3) further comprises an absorption and release water tank and a couch roll, 3 groups of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, a negative pressure suction device 10 is arranged below an inlet of a circulating conveying curtain 9 in the steps (3) and (5), a first fiber layer 1 is peeled from the inclined wire through suction, is closely attached to a second fiber layer 2, and is synchronously conveyed to the next process on the conveying curtain together with the second fiber layer 2, in the step (6), a flat-net hydro-entangled head 13 is adopted to carry out multi-channel hydro-entanglement on the front side of the two overlapped fiber layers, and then a round drum hydro-entangled head 13 is adopted to carry out multi-channel hydro-entanglement on the back side of the fiber layers; wherein the pressure of the front side spunlace head 13 is increased by 30-110 bar, the pressure of the first spunlace head 13 is 30bar for pre-entanglement, and then the pressure of the spunlace head is increased by 40-110 bar for composite entanglement; the reverse side spunlace pressure is reduced by 100-80 bar, 3mm holes are distributed on the spunlace net of the reverse side spunlace circular drum 12 in the step (6), the opening rate is 25%, massive protrusions 4 grains are formed on the surface of the first fiber layer 1, and the drying mode in the step (7) is a hot air penetrating type.
Example 3: referring to fig. 1 to 6, an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric comprises a first fiber layer 1 and a second fiber layer 2, the first fiber layer 1 is a wet inclined net forming fiber net layer, the second fiber layer 2 is a spun-bonded web forming fiber net layer, the first fiber layer 1 is made of wood pulp fibers with the mass percent of 50% and cellulose fibers with the mass percent of 50%, the second fiber layer 2 is made of synthetic fibers with the mass percent of 100%, thermal bonding areas and non-bonding fluffy areas are distributed in the second fiber layer 2, the fibers of the first fiber layer 1 penetrate into the non-bonding fluffy areas at the corresponding positions of the second fiber layer 2 and are mutually entangled with the fibers of the second layer, a plurality of through holes 3 penetrating through the first fiber layer 1 are further distributed on the surface of the first fiber layer 1, and a plurality of stripe-shaped bulges 4 are further distributed on the surface of the first fiber layer 1.
The surface of the second fiber layer 2 is distributed with a plurality of bare fibers formed by the first fiber layer 1 in an inserting way, and the bare fibers are mainly distributed in a plush shape.
The wood pulp beating degree in the first fiber layer 1 is 15 SR degrees, the cellulose fiber in the first fiber layer 1 is the combination of natural cotton fiber and bamboo fiber, the bamboo fiber fineness in the first fiber layer 1 is 1.5dtex, and the bamboo fiber length in the first fiber layer 1 is 12 mm.
The synthetic fibers in the second fiber layer 2 are polylactic acid fibers, the synthetic fibers in the second fiber layer 2 are filaments, and the second fiber layer 2 is consolidated through heat bonding to form a plurality of uniform and respective consolidation points.
The shape of the consolidation point is cross-shaped.
The maximum diagonal length of the fixed point is 8mm, and the area percentage of the fixed point is 16%.
The sum of the areas of the through holes 3 of the first fiber layer 1 is 12% of the area of the top surface of the first fiber layer 1.
The first fiber layer 1 is a fiber net layer formed by an online wet inclined net, the second fiber layer 2 is a fiber net layer formed by online spun-bonded web, and the unit area mass of the spun-bonded spunlace composite non-woven fabric formed by the inclined net and formed by online spun-bonded is 50 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 15 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a certain proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 0.8%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former 8 through a fan pump, dehydrating to form a net to prepare a first fiber layer 1, conveying to a circulating conveying curtain 9, and placing on a second fiber layer 2;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spunbond machine 5 for spinning, cooling and drafting continuous filaments, and paving the filaments on a spunbond forming net 6 to form a net-shaped structure;
(5) the polymer filament fiber web is thermally bonded and consolidated through a hot rolling mill 7 according to the process requirements to form a second fiber layer 2, and the second fiber layer 2 is conveyed to an endless conveying curtain 9 and is arranged below the first fiber layer 1;
(6) superposing the first fiber layer 1 and the second fiber layer 2, introducing the superposed fiber webs onto a spunlace web supporting curtain 11, carrying out 6 front and 2 back spunlacing on the superposed fiber webs by using a spunlace process, carrying out the front spunlacing to ensure that the fibers of the first fiber layer 1 are interpenetrated and implanted into the second fiber layer 2, combining the fibers with the fibers of the second fiber layer 2 into a whole after being intertwined, and forming striped convex 4 lines on the surfaces of the second fiber layer 2 by the back spunlacing;
(7) removing water from the spunlaced material by a vacuum suction dehydration device 15 and a rolling drying dehydration device 16, and making the spunlaced material into an inclined wire forming online spun-bonded spunlaced composite non-woven fabric of 50 g/square meter by a drying machine 17 and a lap former 18.
The forming concentration of the fiber suspension fed into the inclined wire former 8 in the step (3) is 0.03%, the inclined wire former 8 in the step (3) further comprises an absorption and release water tank and a couch roll, 2 groups of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, a negative pressure suction device 10 is arranged below an inlet of a circulating conveying curtain 9 in the steps (3) and (5), a first fiber layer 1 is peeled from the inclined wire through suction, is closely attached to a second fiber layer 2, and is synchronously conveyed to the next process on the conveying curtain together with the second fiber layer 2, in the step (6), a flat-screen hydro-entangled head 13 is adopted to carry out multi-channel hydro-entangled on the front side of the two overlapped fiber layers, and then a round drum hydro-entangled head 13 is adopted to carry out multi-channel hydro-entangled on the back side of the fiber layers; wherein the pressure of the front side spunlace head 13 is increased gradually at 25-70 bar, the pressure of the first spunlace head 13 is 25bar for pre-entanglement, and then the pressure of the spunlace head is increased gradually at 35-70 bar for composite entanglement; the reverse side spunlace pressure is 65bar and 55bar, the spunlace net of the reverse side spunlace circular drum 12 in the step (6) is in a 0.5mm steel wire single-layer weaving structure, the spunlace lines are matched to form strip-shaped convex 4 lines on the surface of the first fiber layer 1, and the drying mode in the step (7) is a hot air penetration type.
Example 4: referring to fig. 1 to 6, an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric comprises a first fiber layer 1 and a second fiber layer 2, the first fiber layer 1 is a wet inclined net forming fiber net layer, the second fiber layer 2 is a spun-bonded web forming fiber net layer, the first fiber layer 1 is made of wood pulp fibers with the mass percentage of 80% and cellulose fibers with the mass percentage of 20%, the second fiber layer 2 is made of synthetic fibers with the mass percentage of 100%, thermal bonding areas and non-bonding fluffy areas are distributed in the second fiber layer 2, the fibers of the first fiber layer 1 penetrate into the non-bonding fluffy areas at the corresponding positions of the second fiber layer 2 and are mutually entangled with the fibers of the second layer, a plurality of through holes 3 penetrating through the first fiber layer 1 are further distributed on the surface of the first fiber layer 1, and a plurality of point-like texture bulges 4 are further distributed on the surface of the first fiber layer 1.
The surface of the second fiber layer 2 is distributed with a plurality of bare fibers formed by the first fiber layer 1 in an inserting way, and the bare fibers are mainly distributed in a plush shape.
The beating degree of wood pulp in the first fiber layer 1 was 13 ° SR, the cellulose fiber in the first fiber layer 1 was lyocell fiber, the fineness of the cellulose fiber in the first fiber layer 1 was 1.1dtex, and the length of the cellulose fiber in the first fiber layer 1 was 10 mm.
The synthetic fibers in the second fiber layer 2 are polypropylene fibers, the synthetic fibers in the second fiber layer 2 are filaments, and the second fiber layer 2 is consolidated through heat bonding to form a plurality of uniform and separate consolidation points.
The shape of the consolidation point is circular.
The maximum diagonal length of the fixed point is 2mm, and the area ratio of the fixed point is 30%.
The sum of the areas of the through holes 3 of the first fiber layer 1 was 27% of the area of the top surface of the first fiber layer 1.
The first fiber layer 1 is a fiber net layer formed by an online wet inclined net, the second fiber layer 2 is a fiber net layer formed by online spun-bonded web, and the unit area mass of the spun-bonded spunlace composite non-woven fabric formed by the inclined net and formed by online spun-bonded is 65 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 13 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a certain proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 0.5%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former 8 through a fan pump, dehydrating to form a net to prepare a first fiber layer 1, conveying to a circulating conveying curtain 9, and placing on a second fiber layer 2;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spunbond machine 5 for spinning, cooling and drafting continuous filaments, and paving the filaments on a spunbond forming net 6 to form a net-shaped structure;
(5) the polymer filament fiber web is thermally bonded and consolidated through a hot rolling mill 7 according to the process requirements to form a second fiber layer 2, and the second fiber layer 2 is conveyed to an endless conveying curtain 9 and is arranged below the first fiber layer 1;
(6) superposing the first fiber layer 1 and the second fiber layer 2, introducing the superposed fiber webs onto a spunlace web supporting curtain 11, carrying out 8-pass front-side spunlace and 3-pass back-side spunlace on the superposed fiber webs by using a spunlace process, carrying out the spunlace on the front side to enable the fibers of the first fiber layer 1 to be interpenetrated and implanted into the second fiber layer 2, combining the fibers with the fibers of the second fiber layer 2 into a whole after being intertwined, and forming dotted convex 4 lines on the surfaces of the second fiber layer 2 through the back-side spunlace;
(7) removing water from the spunlaced material by a vacuum suction dehydration device 15 and a rolling drying dehydration device 16, and making the spunlaced material into an inclined wire forming online spun-bonded spunlaced composite non-woven fabric of 65 g/square meter by a drying machine 17 and a lap former 18.
The forming concentration of the fiber suspension fed into the inclined wire former 8 in the step (3) is 0.04%, the inclined wire former 8 in the step (3) further comprises an absorption and release water tank and a couch roll, 2 groups of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, in the steps (3) and (5), a negative pressure suction device 10 is arranged below an inlet of a circulating conveying curtain 9, a first fiber layer 1 is peeled from the inclined wire through suction, is tightly attached to a second fiber layer 2, and is synchronously conveyed to the next process on the conveying curtain together with the second fiber layer 2, in the step (6), a flat-screen hydro-entangled head 13 is adopted to carry out a plurality of hydro-entangled processes on the front side of the two overlapped fiber layers, and then a round drum hydro-entangled head 13 is adopted to carry out a plurality of hydro-entangled processes on the back side of the; wherein the pressure of the front side spunlace head 13 is increased by 20-90 bar, the pressure of the first spunlace head 13 is 20bar for pre-entanglement, and then the pressure of the spunlace head is increased by 40-90 bar for composite entanglement; the reverse side spunlace pressure is decreased gradually at 75-60 bar, 0.3mm holes are distributed on the spunlace net of the reverse side spunlace circular drum 12 in the step (6), the aperture ratio is 7%, the surface of the first fiber layer 1 is provided with dotted bulges 4 grains, and the drying mode in the step (7) is a hot air penetration type.
Example 5: referring to fig. 1 to 6, an inclined wire forming on-line spun-bonded spunlace composite nonwoven fabric comprises a first fiber layer 1 and a second fiber layer 2, the first fiber layer 1 is a wet inclined net forming fiber net layer, the second fiber layer 2 is a spun-bonded web forming fiber net layer, the first fiber layer 1 is made of wood pulp fiber with the mass percentage of 70% and cellulose fiber with the mass percentage of 30%, the second fiber layer 2 is made of synthetic fiber with the mass percentage of 100%, a thermal bonding area and a non-bonding fluffy area are distributed in the second fiber layer 2, the fiber of the first fiber layer 1 penetrates into the non-bonding fluffy area at the corresponding position of the second fiber layer 2 and is mutually entangled with the second fiber layer, a plurality of through holes 3 penetrating through the first fiber layer 1 are further distributed on the surface of the first fiber layer 1, and a plurality of point-like texture bulges 4 are further distributed on the surface of the first fiber layer 1.
The surface of the second fiber layer 2 is distributed with a plurality of bare fibers formed by the first fiber layer 1 in an inserting way, and the bare fibers are mainly distributed in a plush shape.
The wood pulp beating degree in the first fiber layer 1 is 14 SR degrees, the cellulose fiber in the first fiber layer 1 is the combination of viscose fiber and bamboo fiber, the cellulose fiber fineness in the first fiber layer 1 is 2.5dtex, and the cellulose fiber length in the first fiber layer 1 is 6 mm.
The synthetic fibers in the second fiber layer 2 are polypropylene fibers, the synthetic fibers in the second fiber layer 2 are filaments, and the second fiber layer 2 is consolidated through heat bonding to form a plurality of uniform and separate consolidation points.
The shape of the consolidation point is rice grain shape.
The maximum diagonal length of the fixed point is 3mm, and the area ratio of the fixed point is 15%.
The sum of the areas of the through holes 3 of the first fiber layer 1 is 11% of the area of the top surface of the first fiber layer 1.
The first fiber layer 1 is a fiber net layer formed by an online wet inclined net, the second fiber layer 2 is a fiber net layer formed by online spun-bonded web, and the unit area mass of the spun-bonded spunlace composite non-woven fabric formed by the inclined net and formed by online spun-bonded is 40 g/square meter.
A preparation method of inclined-wire-forming online spun-bonded spunlace composite non-woven fabric comprises the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 14 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a certain proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 1.5%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former 8 through a fan pump, dehydrating to form a net to prepare a first fiber layer 1, conveying to a circulating conveying curtain 9, and placing on a second fiber layer 2;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spunbond machine 5 for spinning, cooling and drafting continuous filaments, and paving the filaments on a spunbond forming net 6 to form a net-shaped structure;
(5) the polymer filament fiber web is thermally bonded and consolidated through a hot rolling mill 7 according to the process requirements to form a second fiber layer 2, and the second fiber layer 2 is conveyed to an endless conveying curtain 9 and is arranged below the first fiber layer 1;
(6) superposing the first fiber layer 1 and the second fiber layer 2, introducing the superposed fiber webs onto a spunlace web supporting curtain 11, carrying out 5-way front-side and 2-way reverse-side spunlacing on the superposed fiber webs by using a spunlace process, carrying out the spunlace on the front side to enable the fibers of the first fiber layer 1 to be interpenetrated and implanted into the second fiber layer 2, combining the fibers with the fibers of the second fiber layer 2 into a whole after being intertwined, and forming dotted convex 4 lines on the surfaces of the second fiber layer 2 through reverse-side spunlace;
(7) removing water from the spunlaced material by a vacuum suction dehydration device 15 and a rolling drying dehydration device 16, and making the spunlaced material into an inclined wire forming online spun-bonded spunlaced composite non-woven fabric of 40 g/square meter by a drying machine 17 and a lap former 18.
The forming concentration of the fiber suspension fed into the inclined wire former 8 in the step (3) is 0.04%, the inclined wire former 8 in the step (3) further comprises an absorption and release water tank and a couch roll, 1 group of vacuum suction devices are further arranged between the absorption and release water tank and the couch roll, a negative pressure suction device 10 is arranged below an inlet of a circulating conveying curtain 9 in the steps (3) and (5), a first fiber layer 1 is peeled from the inclined wire through suction, is closely attached to a second fiber layer 2, and is synchronously conveyed to the next process on the conveying curtain together with the second fiber layer 2, in the step (6), a flat-net hydro-entangled head 13 is adopted to carry out multi-channel hydro-entanglement on the front side of the two overlapped fiber layers, and then a round drum hydro-entangled head 13 is adopted to carry out multi-channel hydro-entanglement on the back side of the fiber layers; wherein the pressure of the front side spunlace head 13 is increased gradually by 15-65 bar, the pressure of the first spunlace head 13 is 15bar for pre-entanglement, and then the pressure of the spunlace head is increased gradually by 30-65 bar for composite entanglement; the reverse side spunlace pressure is 55bar and 50bar, the spunlace net of the reverse side spunlace circular drum 12 in the step (6) is distributed with 0.3mm holes, the aperture ratio is 12 percent, so that the surface of the first fiber layer 1 forms dotted bulges 4 lines, and the drying mode in the step (7) is a hot air penetration type.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (10)
1. The inclined-net-forming online spun-bonded spunlace composite non-woven fabric comprises a first fiber layer and a second fiber layer, and is formed by laminating the first fiber layer and the second fiber layer, and is characterized in that: the first fiber layer is a wet inclined net forming fiber net layer, the second fiber layer is a spun-bonded web forming fiber net layer, the first fiber layer is made of wood pulp fibers with the mass percentage of 20% -100% and cellulose fibers with the mass percentage of 0% -80%, the second fiber layer is made of synthetic fibers with the mass percentage of 100%, a heat bonding area and a non-bonding fluffy area are distributed in the second fiber layer, the fibers of the first fiber layer penetrate into the non-bonding fluffy area at the corresponding position of the second fiber layer and are mutually entangled with the fibers of the second layer, a plurality of through holes penetrating through the first fiber layer are further distributed on the surface of the first fiber layer, and a plurality of point-like raised grains, or stripe-like raised grains, or block-like grains and raised grains are further distributed on the surface of the first fiber layer.
2. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 1, wherein: and a plurality of exposed fibers formed by the first fiber layers in an interpenetration mode are distributed on the surface of the second fiber layer, and the exposed fibers are mainly distributed in a plush shape at the end.
3. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 1, wherein: the wood pulp beating degree in the first fiber layer is 10-20 degrees SR, the cellulose fiber in the first fiber layer is one or any combination of natural cotton fiber, viscose fiber, lyocell fiber and bamboo fiber, the fineness of the cellulose fiber in the first fiber layer is 0.3-3.5 dtex, and the length of the cellulose fiber in the first fiber layer is 3-15 mm.
4. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 1, wherein: the synthetic fibers in the second fiber layer are one or any combination of polypropylene fibers, polyester fibers and polylactic acid fibers, the synthetic fibers in the second fiber layer are filaments, and the second fiber layer is consolidated through heat bonding to form a plurality of uniformly distributed consolidation points.
5. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 4, wherein: the shape of the consolidation point is circular, oval, rhombic, square, rectangular, hexagonal, rice grain-shaped, long strip-shaped or cross-shaped.
6. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 5, wherein: the maximum diagonal length of the fixed point is 0.1-10 mm, and the area ratio of the fixed point is 10-40%.
7. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 1, wherein: the sum of the areas of the through holes of the first fiber layer is 5-40% of the area of the top surface of the first fiber layer.
8. The oblique-wire formed on-line spun-bonded hydroentangled composite nonwoven fabric according to claim 1, wherein: the first fiber layer is a fiber net layer formed by an online wet inclined wire, the second fiber layer is a fiber net layer formed by online spun-bonded web forming, and the mass per unit area of the online spun-bonded spunlace composite non-woven fabric formed by the inclined wire is 25-120 g/square meter.
9. A preparation method of an inclined-wire-forming online spun-bonded spunlace composite non-woven fabric is characterized by comprising the following steps:
(1) feeding the wood pulp into a disintegrating device in proportion for disintegrating to prepare a wood pulp fiber suspension with a beating degree of 10-20 DEG SR;
(2) feeding cellulose fibers into a discharging device according to a proportion, and dispersing and diluting to prepare a cellulose fiber suspension with the concentration of 0.2-1.5%;
(3) mixing the wood pulp fiber suspension and the cellulose fiber suspension according to the mass percentage of the process design, then diluting, purifying, screening, sending into an inclined wire former through a fan pump, dewatering to form a net to prepare a first fiber layer, conveying to a circulating conveying curtain, and placing on a second fiber layer;
(4) putting the polymer slices into a screw extruder, carrying out hot melt extrusion, filtering and metering, feeding the polymer slices into a spinning assembly for spinning, cooling and drafting continuous filaments, and paving the filaments on a forming net to form a net structure;
(5) the polymer filament fiber net is thermally bonded and consolidated according to the process requirements to form a second fiber layer, and the second fiber layer is conveyed to the circulating conveying curtain and is arranged below the first fiber layer;
(6) superposing a first fiber layer and a second fiber layer, then introducing the superposed fiber web onto a spunlace web supporting curtain, carrying out 4-12 front side spunlace and 2-4 back side spunlace on the superposed fiber web by using a spunlace process, carrying out the front side spunlace so that the fibers of the first fiber layer are interpenetrated and implanted into the second fiber layer, combining the fibers with the fibers of the second fiber layer into a whole after being entangled, and forming punctate convex grains, or stripe convex grains, or blocky convex grains on the surface of the second fiber layer by the back side spunlace;
(7) and (3) removing water from the spunlaced material by vacuum suction or a drying roll, drying and coiling to prepare the inclined-net forming online spun-bonded spunlaced composite non-woven fabric of 25-120 g/square meter.
10. The method for preparing the inclined wire forming online spun-bonded spunlace composite nonwoven fabric according to claim 9, which is characterized in that: the forming concentration of the fiber suspension sent into the inclined wire former in the step (3) is 0.02-0.05%; the oblique net former in the step (3) further comprises a dewatering box and a couch roll, and 1-3 groups of vacuum suction devices are further arranged between the dewatering box and the couch roll; in the steps (3) and (5), a negative pressure suction device is arranged below the inlet of the circulating conveying curtain, the first fiber layer is peeled from the inclined net through the suction effect, is tightly attached to the second fiber layer, and is synchronously conveyed to the next procedure on the conveying curtain together with the second fiber layer; in the step (6), a flat-screen spunlace head is adopted to perform multiple spunlace on the front surfaces of the two superposed fiber layers, and then a round-drum spunlace head is adopted to perform multiple spunlace on the back surfaces of the fiber layers; the pressure of the front side spunlace heads is increased by 10-110 bar, the pressure of the first spunlace head is 10-30 bar for pre-entanglement, and then the pressure of the spunlace heads is increased by 30-110 bar for composite entanglement; the reverse spunlace pressure is 30-100 bar; step (6), distributing 0.3-5 mm holes in a spunlace net of a reverse spunlace drum, wherein the opening rate is 7-47%, forming punctiform raised grains or blocky raised grains on the surface of the first fiber layer, or enabling the spunlace net of the spunlace drum to be of a single-layer or double-layer woven structure of 0.2-1 mm steel wires, and forming strip-shaped raised grains on the surface of the first fiber layer by matching with the spunlace grains; the drying mode in the step (7) is a hot air penetration type.
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