CN114086397B

CN114086397B - High-density non-woven fiber material and preparation method thereof

Info

Publication number: CN114086397B
Application number: CN202111179667.9A
Authority: CN
Inventors: 赵程波
Original assignee: HANGZHOU NBOND NONWOVENS CO LTD
Current assignee: HANGZHOU NBOND NONWOVENS CO LTD
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2023-08-08
Anticipated expiration: 2041-10-08
Also published as: CN114086397A

Abstract

The invention relates to the field of non-woven materials, and discloses a high-density non-woven fiber material and a preparation method thereof, wherein the density of the high-density non-woven fiber material is 0.9-1.1 g/cm ³ The adhesive comprises a first adhesive layer, a first fiber layer, a second fiber layer, a third fiber layer and a second adhesive layer which are sequentially attached; the fiber length of the first fiber layer and the third fiber layer is larger than that of the second fiber layer, and the fibers of each adjacent fiber layer are mutually entangled. The invention uses the non-woven fiber material to replace the traditional woven cloth as the fiber material for printing, and has the advantages of short preparation flow, low production cost and environmental protection in the production process; the invention also solves the problems of poor hand tearing property, low density, high elongation at break and poor cloth cover flatness of the conventional non-woven fiber material, and is not suitable for printing materials.

Description

High-density non-woven fiber material and preparation method thereof

Technical Field

The invention relates to the field of non-woven materials, in particular to a high-density non-woven fiber material and a preparation method thereof.

Background

The printing fiber material is a flexible fiber material suitable for printing and processing, and is widely used in the fields of interior decoration, automobile interior decoration, trademark labels, cultural goods and the like. The label material (trademark cloth) for printing is cut and printed with necessary characters and patterns, and is mainly used for labeling products such as clothing, home textiles, boots caps, toys and the like. According to the processing and using requirements, the printing fiber material should have higher density and certain dry and wet fracture strength; dry cleaning and water washing resistance; the printing ink has good printability; the difference of the longitudinal and transverse fracture strength is small, and the shape stability is good; good opacity. In addition, the printing fiber material should have soft hand, elegant appearance and duplex uniformity.

Patent CN201510019619.1 discloses a trademark cloth easy to tear and a preparation method thereof, and relates to the technical field of textile materials. The easily torn trademark cloth comprises a base cloth layer and a sizing material layer, wherein the base cloth layer interweaves warp yarns and weft yarns into a plane cloth through a loom, the warp yarns and the weft yarns adopt acetate fiber yarns with 70-100 denier, and each acetate fiber yarn with 12-36 spun yarns are formed; the warp yarn density is 90-110 and the weft yarn density is 60-80. The easy-to-tear trademark cloth is manufactured through three steps of grey cloth layer weaving, dyeing and finishing desizing setting treatment and coating treatment. The invention selects the cloth woven by the acetate fiber yarn to replace the cloth of common man-made fiber in the market, and the acetate fiber cloth is easy to tear, so that the trademark of the place of production on the clothes can be quickly replaced or unnecessary trademark cloth can be easily torn off, thereby improving the convenience. However, this solution has the disadvantage of high acetate prices; the weaving, dyeing and finishing, desizing and coating treatment process flow is long, and the production cost is high; the dyeing and finishing, desizing and coating processing can cause environmental pollution.

Patent CN201911157382.8 discloses a method for producing a nylon-polyester easy-tearing cloth, which uses nylon-polyester filaments as warp filaments and weft filaments to be woven into grey cloth, wherein the nylon-polyester is not limited to 100% nylon, but can be composite filaments, namely nylon-polyester and regenerated polyester or other synthetic fibers. The grey cloth is treated with alkali and alcohol (such as glycol, benzyl alcohol, etc.) during refining and dyeing, and then soaping and shaping are carried out to obtain the nylon-polyester easy-tearing cloth. Through the mode, the easy-tearing cloth obtained by the production method can be used as trademark cloth industry, the tearing strength of the easy-tearing cloth after being broken is basically the same as that of the nylon-polyester composite cloth, and the tearing strength test result is as follows: the warp is 2.5-5.8N, the weft is 3.5-9N, the warp and weft strength is not limited to the warp and weft, and the warp and weft strength can be used in an inverted manner, so that the warp and weft limitation of the original nylon-polyester composite cloth is greatly improved. However, this solution has the disadvantage that the grey cloth needs to be treated with alkali and alcohols (e.g. ethylene glycol, benzyl alcohol, etc.) during refining and dyeing, and the production process is not friendly to the environment.

Patent CN201610889876.5 discloses a silk easy-to-tear fabric, and a preparation method and application thereof, wherein the silk easy-to-tear fabric comprises warp yarns and weft yarns, and the warp yarns and the weft yarns are made of POY filaments. The invention also provides a preparation method of the silk easy-tearing cloth, which comprises spinning, winding, stretching and warping, grey cloth, refining, acid treatment, alkali treatment and shaping. The silk easy-tearing cloth provided by the invention can be applied to the fields of medical sanitary materials, electronic adhesive tapes, trademark cloth and the like, and the application range of the easy-tearing cloth is greatly expanded. The disadvantage of this solution is the long production flow; the grey cloth needs refining, acid treatment, alkali treatment and the like, and can have influence on the environment and the like.

In summary, the current common printing fiber materials are mainly woven fabrics, the warp and weft directions of which are mostly acetic acid or other synthetic fiber filaments or yarns, and are formed by conventional textile weaving, finishing, coating and calendaring. The existing printing fiber material mainly has the following problems in the processing and using processes:

1. the production process of the printing fiber material produced by the traditional textile technology from the fiber (filament) raw material to the final finished product is longer, and the production generally needs the procedures of acid and alkali treatment, coating processing and the like of the grey cloth, which can cause a certain adverse effect on the environment;

2. For the fiber material used for printing as the clothing label, many clothing manufacturers send the clothing to other countries to replace the trademark of the clothing where the clothing is produced, and if the trademark cloth needs to be cut off and replaced one by one, the time and the labor are very consumed, so the clothing label material is required to be easy to tear;

3. for some consumers, it is often desirable that the garment label material be easy to tear by hand, as the label will cause itching to the skin and the next to skin label will be removed.

4. Conventional nonwoven materials are unsuitable for use as printing materials due to their low density, high elongation at break, poor cloth cover flatness, and the like.

In view of the above problems of the prior art, there is a need to develop a novel printing fiber material. The novel fiber material for printing meets the basic requirements of the printing material and has the characteristics of short preparation flow, low production cost, green and environment-friendly production process and the like. Meanwhile, in order to meet the requirements of changing or removing the trademark of clothing, the novel printing fiber material also has high density and tearability, is convenient to tear by hand, and improves the convenience of using the trademark label.

Disclosure of Invention

The invention provides a high-density non-woven fiber material and a preparation method thereof, and aims to solve the problems that the existing printing fiber material is long in preparation flow, high in production cost, not environment-friendly in production process, not capable of being torn by hand, low in density, high in elongation at break and poor in cloth cover flatness, and is not suitable for printing materials.

The specific technical scheme of the invention is as follows:

in a first aspect, the present invention provides a high-density nonwoven fibrous material, which has a multi-layer structure and comprises a first adhesive layer, a first fibrous layer, a second fibrous layer, a third fibrous layer and a second adhesive layer which are sequentially attached; the fiber length of the first fiber layer and the third fiber layer is larger than that of the second fiber layer, and the fibers of the adjacent fiber layers are mutually entangled; the density of the high-density non-woven fiber material is 0.9-1.1 g/cm ³ 。

The key points of the technical scheme are as follows:

(1) The team of the present invention found during the course of the study that the more uniform the fiber distribution of the fiber material, the more suitable it was for printing. The gauge and arrangement of the fibers affects web uniformity, wherein the short fiber web is more uniform than the long fiber web; the randomly arranged web is more uniform than the directionally arranged web. Therefore, the material adopts a multi-layer structure, wherein the first fiber layer, the second fiber layer and the third fiber layer are mutually overlapped and consolidated, so that fibers of different layers are randomly arranged in the layers, the second fiber layer is positioned in the middle of the material, and the fiber length of the second fiber layer is smaller than that of the upper layer and the lower layer, so that the fiber distribution is more uniform, and the defect of insufficient uniformity of the upper layer and the lower layer of longer fiber net can be overcome. Therefore, the problems that the arrangement of the single-layer structure fibers is uneven, and cloth cover marks caused by fiber web reinforcement influence the surface evenness of the material and reduce the printability of the product can be avoided.

(2) In the invention, the second fiber layer adopts shorter fibers, and the first fiber layer (upper layer) and the third fiber layer (lower layer) adopt longer fibers. Because the fiber length in the second fiber layer is short and the distribution area is large, the shorter fiber can be partially filled into the longer fiber net, the non-uniformity problem caused by the longer fiber layer is solved, and the density of the material is improved.

(3) As described in the background art, most of the existing printing fiber materials are woven fabrics, and most of the warp and weft fibers are acetate or other synthetic fiber filaments or yarns, so that the production process from raw materials to final finished products is long, and complicated post-treatment processes are needed, so that the printing fiber materials are not environment-friendly. The invention replaces the woven cloth with the non-woven fiber material, can obviously shorten the preparation flow, reduce the production cost and is more environment-friendly. However, the surface of the printing fiber material is required to be flat and smooth, while the non-woven material is directly formed by fibers, the fiber web is filled with pores, and the surface is not smooth, so that the printing material cannot meet the requirement. Therefore, the invention is provided with the glue material layers on the upper surface of the first fiber layer and the lower surface of the third fiber layer, and the purpose of the invention is to fill the glue material into the pores of the surface layer fibers, fix the surface layer fibers, reduce the breaking elongation of the material and improve the tearability of the material. In addition, the two sides of the fiber material are provided with the adhesive layers, so that the material has hydrophobicity and meets the washing resistance requirement of the material.

(4) Research and development team researches find that density is a key index affecting permeability and mechanical properties of materials. Under the same condition, the higher material density can reduce the thickness of the material, improve the surface evenness of the material, improve the printability of the material and be beneficial to the tearing property of the material. Therefore, the team of the invention determines the optimal range of the above material densities on the basis of a large number of experimental studies.

Preferably, the sum of the mass of the first adhesive layer and the mass of the second adhesive layer accounts for 20-40% of the total mass of the material; the sum of the mass of the first fiber layer and the third fiber layer accounts for 40-60% of the total mass of the material; the mass of the second fiber layer accounts for 10-30% of the total mass of the material.

Preferably, the fineness of the fibers in the first fiber layer and the third fiber layer is 0.1-1.2 dtex, and the length of the fibers is 25-50 mm; the ratio of the fiber length of the first fiber layer to the fiber length of the third fiber layer to the fiber length of the second fiber layer is 6-45.

Long fibers are adopted in the first fiber layer and the third fiber layer, short fibers are adopted in the second fiber layer, and the proportion of the length of the long fiber and the length of the short fiber is reasonably controlled, so that the material can be ensured to have certain breaking strength, the material can be provided with hand tearing property, part of the short fibers in the second fiber layer can be inserted into the holes of the first fiber layer and the third fiber layer, the density of the material is increased, the smoothness of the surface of the material is improved, and printing processing is facilitated.

Preferably, the first fiber layer and the third fiber layer contain superfine fibers accounting for 20-30% of the total mass of the material and artificial cellulose fibers accounting for 20-30% of the total mass of the material; the first fibrous layer and the third fibrous layer have the same mass.

Preferably, the raw material of the second fiber layer is plant pulp; further, the plant pulp is one or more of wood pulp, cotton pulp, bamboo pulp and hemp pulp.

The invention selects plant fiber and superfine fiber, and balances the physical property index and printability of the material by blending the proportion of the fibers.

Preferably, the superfine fibers in the first fiber layer and the third fiber layer are orange-petal split fibers; the orange-peel split fiber comprises polyester and polyamide, and the fineness of the split fiber is 0.1-0.5 dtex.

The single fiber fineness of the split orange-peel fiber after splitting can reach 0.1-0.5 dtex, the bending stiffness of the fiber is small, and the hand feeling is soft and fine; the superfine fiber has large specific surface area and high compactness, and can improve the uniformity and the cloth cover evenness of the material and improve the printing performance of the material.

Preferably, the artificial cellulose fibers in the first fiber layer and the third fiber layer are one or more combinations of viscose fibers, bamboo fibers and tencel fibers, the fineness is 0.4-1.2 dtex, and the fiber length is 30-40 mm.

The product of the invention is used as a printing material, and needs to have good printability, so that the surface of the material is required to be compact, flat and smooth; and the adoption of the fine denier artificial cellulose fiber can improve the compactness of the material and improve the printing effect of the material.

Preferably, the first adhesive layer and the second adhesive layer contain aqueous polyurethane and titanium powder.

The thermosetting waterborne polyurethane is selected, the thermosetting waterborne polyurethane does not contain reactive-NCO groups in the interior, the thermosetting waterborne polyurethane is cured by the crosslinking reaction between the carboxyl and the hydroxyl in the interior purely by the cohesive force of the polar groups, has low smell, low toxicity and no oil solvent, can avoid the hot-sticking and cold-embrittlement problems caused by the propylene sizing material at the same time, and has a waterproof function when the product is reduced to a flexible touch sense. On the basis, the titanium powder with higher scattering degree is mixed, so that the whiteness of the material can be improved while the internal pores of the fiber net are filled, and the printing performance of the product can be improved.

Preferably, the high-density nonwoven fibrous material has a mass per unit area of 80 to 200g/m ² Elongation at break in longitudinal and transverse directions is 0.5-1.8%, and light transmittance is less than or equal to 10%.

The mass per unit area of a material directly affects the thickness of the material. If the mass per unit area is too small, the thickness of the material is too low, which causes light transmission of the material and affects the definition of printing; if the mass per unit area is too high, the material is not easy to tear, and the hand tearing performance of the material is affected. Therefore, after repeated experimental study, the research and development team of the invention determines the proper range of the mass per unit area.

There are numerous voids in the nonwoven material, the amount of which can affect the printability of the final product. At the same material density, the higher the porosity, the higher the light transmittance. According to the research, the invention discovers that the non-woven material used as the printing material has to control the light transmittance to be below 10 percent so as to obtain a good printing effect.

According to the invention, the research shows that the higher the breaking elongation of the material is, the less the material is easy to tear; the lower the elongation at break and the closer the two indexes of the longitudinal elongation at break and the transverse elongation at break are, the better the hand tearing performance of the material is. Therefore, the team of the invention determines the optimal range of the longitudinal and transverse elongation at break on the basis of intensive research.

In a second aspect, the present invention provides a method for preparing the above high density nonwoven fibrous material, comprising the steps of:

(1) Mixing superfine fiber and man-made cellulose fiber, carding to prepare thin fiber net; then cross lapping is carried out to prepare a thick fiber web; the thick fiber web is drawn, the fiber arrangement direction is changed, the fibers are arranged in a disordered way, and the first fiber web and the third fiber web are respectively manufactured.

(2) And (3) feeding the dry plant pulp material into a space between the first fiber web and the third fiber web to be overlapped, so as to prepare the three-layer composite fiber web.

(3) Feeding the three-layer composite fiber web into a hydroentangling unit, and respectively hydroentangling the front side and the back side of the three-layer composite fiber web to consolidate the three-layer fiber web into a whole, so as to remove redundant moisture in the fiber web; and drying the material to prepare the spunlaced base material.

(4) Feeding the spunlaced base material into a coating unit, and respectively applying sizing materials to the front surface and the back surface of the spunlaced base material; and (5) curing the sizing material on the surface of the spunlaced base material through noise drying.

(5) Carrying out calendaring treatment on the coated material to iron the surface of the material; and then rolling to prepare the printing high-density non-woven fiber material which is easy to tear.

Preferably, in the step (1), the mixed fibers are carded by a roller card.

When a roller carding machine is adopted, the arrangement direction of the fibers after carding is the output direction (longitudinal direction), and the arrangement direction of the fibers is strong; after the cross lapping machine is used for lapping, fibers are arranged randomly in the fiber web, the direction of fiber arrangement is reduced, the difference of longitudinal and transverse breaking strength and breaking elongation of the material is reduced, and the tearability of the material is greatly improved.

Preferably, in the step (3), the three-layer composite fiber net is pre-wetted, then the front surface of the three-layer composite fiber net is reinforced by adopting a plurality of flat net hydroentangled heads, and finally the back surface of the three-layer composite fiber net is reinforced by adopting circular drum hydroentangled heads.

The thickness of the three-layer composite fiber net is reduced after prewetting, the composite fiber net is compacted, and the subsequent hydroentanglement consolidation is facilitated. The fiber in the three-layer composite fiber net after prewetting is not formed with intertwining reinforcement, and the layers are still separated. In this case, the three layers of composite fiber webs are not suitable for being subjected to high-tension drum hydroentanglement, so that offset and wrinkles among the fiber webs are avoided, and uneven surfaces of products are avoided. When the flat net is adopted for hydroentanglement, the three-layer composite fiber net is in a straight state in the whole conveying process, and the surface of the product is smoother. The flat net water thorn adopts the step incremental hydraulic pressure setting, so that the first fiber net, the third fiber net and the dry plant pulp material have a gradual reinforcing process, high pressure is avoided under the condition of loosening at the beginning, the cloth cover is scattered and beaten, and finally the product becomes rough holes, and the surface effect of the material is affected. The drum water jet pressure is gradually increased, so that the back surface of the cloth surface can be stably reinforced, and the conditions of serious water jet holes and uneven cloth surface are avoided.

As a further preferable mode, the water jet pressure of the flat net water jet head is 35-65 kg, and the pressure of each flat net water jet head is gradually increased according to the advancing direction of the material; the hydraulic pressure of the drum is 35-65 kg; and the drum water thorn pressure is gradually increased according to the advancing direction of the material.

Preferably, in step (3), excess moisture in the web is removed by a pad-dry process.

The rolling and drying mode is favorable for improving the flatness of the cloth cover, and the material is favorable for subsequent processing and printing.

Preferably, in the step (3), the consolidated fiber web is dried by adopting a drying cylinder mode; the temperature of the drying cylinder is 100-150 ℃; and the temperature of the drying cylinder is gradually increased according to the advancing direction of the material.

Compared with a hot air penetrating oven, the drying cylinder mode is adopted, the cloth cover is always clung to the wall of the drying cylinder in a stretching and tensioning state, so that the cloth cover is not easy to become fluffy and rough after drying, and the surface of the material is smoother and denser. Because the printing is with the tight dense cloth cover of fibrous material structure, if adopt hot-blast penetration stoving, hot-blast difficult penetration is leveled dense cloth cover, leads to drying efficiency to reduce, influences the normal production of product.

Preferably, in the step (4), the sizing material comprises 50-70% of aqueous polyurethane, 10-15% of titanium powder, 0.1-0.2% of defoaming agent, 5-7% of cross-linking agent, 10-15% of water and 1-2% of dispersing agent.

Preferably, in the step (5), the calendaring treatment adopts a multi-zone calendaring mode, and the material after hot rolling is cooled by a cooling roller.

When in calendaring treatment, a progressive multi-zone calendaring roller is adopted, and the pressure of the calendaring roller is controlled, so that the aqueous polyurethane adhesive on two sides of the material is cured to be smoother and smoother, and the titanium powder is matched to further fill the pores caused by the textures of the spunlaced material, so that the flatness of the surface of the material is further improved. The device can avoid the problems that the calendaring pressure is high, the thickness is too small to cause the filming of the material and the thickness is too large to cause the reduction of the flatness of the material.

The rolled material is cooled in a rolling state, so that the cloth cover is in a flat state all the time, the problem of uneven surface of the material due to shrinkage and the like caused by natural cooling is avoided, and the flatness of the material after hot rolling is not affected.

Preferably, in the step (5), the calendaring temperature is 100 to 150 ℃ and the pressure is 0.1 to 0.4Mpa.

The calendering process is to further flatten and smooth the cloth cover, flatten and fill hairiness, and simultaneously, after continuous multistage calendering, crosslink and solidify the water polyurethane of the cloth cover under the action of a crosslinking agent, and fill the water polyurethane and titanium powder on the water thorn lines together to prepare a smooth and flat surface, thereby greatly improving the printing performance of the non-woven material.

In a third aspect, the present invention provides a high-density nonwoven fibrous material production apparatus, comprising, in order according to a processing procedure: coating unit, calendering unit, cooling unit, lapping unit.

The coating unit sequentially comprises one or more coating subunits connected in series according to the processing procedure; each coating subunit comprises a coating mechanism and a drying mechanism which are connected in series according to the processing procedure.

The calendaring unit comprises a plurality of front calendaring mechanisms and back calendaring mechanisms which are alternately arranged according to the processing procedures.

The cooling unit comprises cooling rollers which are fixed on the frame and are arranged in pairs.

A plurality of cloth guide rollers for conveying materials are arranged between the units.

Preferably, the coating mechanism comprises an annular adhesive tape capable of circularly rotating, a plurality of adhesive tape guide rollers for driving and conveying the annular adhesive tape, a sizing mechanism arranged above the annular adhesive tape and a coating scraper.

Preferably, the edge of the coating scraper is round; the drying mechanism is an infrared drying mechanism.

The viscosity of the sizing material is higher, and when a round scraper is adopted, the sizing material stays under the blade for a long time, so that the sizing material is suitable for the conditions of heavy weight and large coating quantity. The infrared drying has the characteristics of high speed, good quality, high efficiency and the like, and is suitable for rapidly curing the coating sizing material on the surface of the fiber material.

Preferably, the front calendaring mechanism comprises a front heat conduction roller, a front compression roller matched with the front heat conduction roller and an upper pressurizing mechanism connected above the front compression roller; the back surface calendaring mechanism comprises a back surface heat conduction roller, a back surface compression roller matched with the back surface heat conduction roller and a lower pressurizing mechanism connected below the back surface compression roller.

Preferably, the calendaring mechanism further comprises a heating mechanism connected with the front heat conduction roller and the back heat conduction roller.

The working flow and principle of the production device are as follows: the dry water thorn base material is sent into a coating mechanism, so that the water thorn base material is placed on an annular adhesive tape with the front surface upwards; the sizing mechanism coats sizing material on the front surface of the spun-laced base material, and the spun-laced base material passes under the scraper under the drive of the annular adhesive tape, so that the sizing material is uniformly distributed on the front surface of the spun-laced base material; the glued base material is solidified to the front surface of the spun-laced base material through a drying mechanism; then the material is sent to the next coating mechanism, so that the reverse side of the spun-laced base material is upwards placed on the annular adhesive tape; the glue applying mechanism applies glue stock to the back surface of the spun-laced base material, and the spun-laced base material passes under the scraper under the drive of the annular adhesive tape, so that the glue stock is uniformly distributed on the back surface of the spun-laced base material; and (3) the glued base material passes through a drying mechanism, and the sizing material is solidified to the reverse side of the spun-laced base material. Feeding the material into a calendaring unit under a tensioning state, enabling the material to pass through the middle of a heat conduction roller and a compression roller, respectively calendaring the front surface and the back surface of the material, feeding the calendared material into a cooling roller for cooling, and improving the surface smoothness of the material; and (5) feeding the material into a rolling mechanism to obtain a finished product.

Compared with the prior art, the invention has the beneficial effects that:

(1) The invention ensures that the non-woven fiber material which is not suitable for printing originally obtains good printability and tearability through strict optimization and limitation in the aspects of fiber types, fiber specifications, material structure, material unit area quality and the like and through the process cooperation of fiber carding, sizing material components and the like.

(2) The invention takes superfine fiber, artificial cellulose fiber and plant pulp as raw materials, and directly prepares the fiber into the fiber material for printing through the technological processes of dry-process net forming, water jet reinforcement, scraper coating, calendaring cooling and the like, compared with the traditional woven cloth, the invention shortens the technological process, has low production cost, and solves the problems of long technological process, high cost and insufficient environmental protection of the existing fiber material for printing.

(3) According to the type of the sizing material, a scraper coating is adopted in the preparation process of the product, and the hydro-entangled base is arranged on the annular adhesive tape for application, so that the characteristics of the hydro-entangled non-woven material are fully considered, and the problem that the high-viscosity sizing material cannot be applied on the flexible hydro-entangled material is solved.

(4) The high-density non-woven fiber material production device adopts the disposable double-sided coating to the material, omits the procedures of midway material changing, transferring and the like, and solves the problem that the conventional printing fiber material production cannot adopt a scraper to perform the disposable double-sided coating. And the production device has the advantages of simple structure, convenient operation and high production efficiency, and is suitable for actual popularization.

Drawings

FIG. 1 is a schematic illustration of a structure of a high density nonwoven fibrous material of example 1;

FIG. 2 is a schematic diagram showing a connection of the apparatus for producing a high-density nonwoven fibrous material in example 1;

fig. 3 is a graph showing the printing effect of example 2 compared with that of comparative example 2.

The reference numerals are: the first adhesive layer 1, the first fiber layer 2, the second fiber layer 3, the third fiber layer 4, the second adhesive layer 5, the spunlaced substrate 6, the coating unit 7, the calendaring unit 8, the cooling unit 9, the rolling unit 10, the adhesive 11, the high-density nonwoven fiber material 12, the cloth guide roller 13, the sizing mechanism 701, the annular adhesive tape 702, the adhesive tape guide roller 703, the coating scraper 704, the drying mechanism 705, the front heat-conducting roller 801, the front press roller 802, the upper press mechanism 803, the back heat-conducting roller 804, the back press roller 805, the lower press mechanism 806 and the cooling roller 901.

Detailed Description

The invention is further described below with reference to examples.

General examples

The high-density non-woven fiber material is in a multi-layer structure as shown in fig. 1, and comprises a first adhesive layer 1, a first fiber layer 2, a second fiber layer 3, a third fiber layer 4 and a second adhesive layer 5 which are sequentially attached. The fiber length of the first fiber layer and the third fiber layer is larger than that of the second fiber layer, and the fibers of the adjacent fiber layers are mutually entangled; the density of the high-density non-woven fiber material is 0.9-1.1 g/cm ³ The mass per unit area is 80-200 g/m ² Elongation at break in longitudinal and transverse directions is 0.5-1.8%, and light transmittance is less than or equal to 10%.

Wherein the sum of the mass of the first adhesive layer and the second adhesive layer accounts for 20-40% of the total mass of the material; the sum of the mass of the first fiber layer and the third fiber layer accounts for 40-60% of the total mass of the material; the mass of the second fiber layer accounts for 10-30% of the total mass of the material. Preferably, the first fiber layer and the third fiber layer contain superfine fibers accounting for 20-30% of the total mass of the material and artificial cellulose fibers accounting for 20-30% of the total mass of the material; the mass of the first fiber layer is the same as that of the third fiber layer; the fineness of the fibers in the first fiber layer and the third fiber layer is 0.1-1.2 dtex, and the length of the fibers is 25-50 mm; the ratio of the fiber length of the first fiber layer to the fiber length of the third fiber layer to the fiber length of the second fiber layer is 6 to 45.

Preferably, the raw material of the second fiber layer is plant pulp, and more preferably one or more of wood pulp, cotton pulp, bamboo pulp and hemp pulp; the superfine fibers in the first fiber layer and the third fiber layer are orange-petal split fibers, the components are polyester and polyamide, and the fineness after splitting is 0.1-0.5 dtex; the artificial cellulose fibers in the first fiber layer and the third fiber layer are one or more combinations of viscose fibers, bamboo fibers and tencel fibers, the fineness is 0.4-1.2 dtex, and the fiber length is 30-40 mm.

A method of making a high density nonwoven fibrous material comprising the steps of:

(1) Mixing superfine fibers and man-made cellulose fibers, carding the mixed fibers by adopting a roller carding machine, and preparing the fibers into a thin fiber web; then cross lapping is carried out to prepare a thick fiber web; the thick fiber web is drawn, the fiber arrangement direction is changed, the fibers are arranged in a disordered way, and the first fiber web and the third fiber web are respectively manufactured.

(3) The three-layer composite fiber net is sent into a hydro-entangled unit, pre-wetting is carried out firstly, and then the front surface of the three-layer composite fiber net is reinforced by adopting a plurality of flat net hydro-entangled heads (the hydro-entangled pressure is 35-65 kg, and the pressure of the hydro-entangled heads is gradually increased according to the advancing direction of the material); then reinforcing the back surface of the three-layer composite fiber net by adopting a drum hydroentangled method (the hydroentangled pressure is 35-65 kg, and the hydroentangled pressure is gradually increased according to the advancing direction of the material); finally removing redundant water in the fiber web by adopting a rolling and drying mode; drying the material by adopting a drying cylinder mode (the cylinder temperature is 100-150 ℃ and gradually increases according to the advancing direction of the material); and drying to prepare the spunlaced base material.

(4) The hydro-entangled substrate is sent into a coating unit, and sizing materials (50-70% of waterborne polyurethane, 10-15% of titanium powder, 0.1-0.2% of defoaming agent, 5-7% of cross-linking agent, 10-15% of water and 1-2% of dispersing agent) are respectively applied to the front side and the back side of the hydro-entangled substrate; and (5) curing the sizing material on the surface of the spunlaced base material through noise drying.

(5) Carrying out calendaring treatment (calendaring temperature is 100-150 ℃ and pressure is 0.1-0.4 Mpa) on the coated material by adopting a multi-zone calendaring mode to make the surface of the material ironed; cooling the hot rolled material by a cooling roller; and rolling to obtain the high-density non-woven fiber material.

In the above process, a high-density nonwoven fibrous material production device is used for processing, as shown in fig. 2, and the production device sequentially comprises the following processing procedures: a coating unit 7, a calendaring unit 8, a cooling unit 9, and a rolling unit 10; a plurality of cloth guide rollers 13 for conveying materials are arranged between the units. Wherein:

the coating unit sequentially comprises one or more coating subunits connected in series according to the processing procedure; each of the coating subunits includes a coating mechanism and a drying mechanism 705 in series according to a process sequence. The coating mechanism comprises an annular adhesive tape 702 capable of circularly rotating, a plurality of adhesive tape guide rollers 703 for driving and conveying the annular adhesive tape, a sizing mechanism 701 and a coating scraper 704, wherein the sizing mechanism 701 and the coating scraper 704 are arranged above the annular adhesive tape; the edge of the coating scraper is round; the drying mechanism is an infrared drying mechanism.

The calendaring unit comprises a plurality of front calendaring mechanisms and back calendaring mechanisms which are alternately arranged according to the processing procedures. The front calender mechanism includes a front heat-conducting roller 801, a front pressing roller 802 that cooperates with the front heat-conducting roller, and an upper pressing mechanism 803 that is connected above the front pressing roller. The back surface calendaring mechanism comprises a back surface heat conduction roller 804, a back surface compression roller 805 matched with the back surface heat conduction roller, and a lower pressurizing mechanism 806 connected below the back surface compression roller; the front side heat conduction roller and the back side heat conduction roller are connected with a heating system which is arranged separately.

The cooling unit includes a pair of cooling rollers 901 fixed to the frame.

The working flow and principle of the production device are as follows: the dry water thorn base material 6 is sent into a coating mechanism, so that the water thorn base material is placed on an annular adhesive tape with the right side upwards; the sizing mechanism coats sizing material on the front surface of the spun-laced base material, and the spun-laced base material passes under the scraper under the drive of the annular adhesive tape, so that the sizing material is uniformly distributed on the front surface of the spun-laced base material; the glued base material is solidified to the front surface of the spun-laced base material through a drying mechanism; then the material is sent to the next coating mechanism, so that the reverse side of the spun-laced base material is upwards placed on the annular adhesive tape; the sizing mechanism applies sizing material 11 to the reverse side of the spun-laced base material, and the spun-laced base material passes under a scraper under the drive of an annular adhesive tape, so that the sizing material is uniformly distributed on the reverse side of the spun-laced base material; and (3) the glued base material passes through a drying mechanism, and the sizing material is solidified to the reverse side of the spun-laced base material. Feeding the material into a calendaring unit under a tensioning state, enabling the material to pass through the middle of a heat conduction roller and a compression roller, respectively calendaring the front surface and the back surface of the material, feeding the calendared material into a cooling roller for cooling, and improving the surface smoothness of the material; the material is fed into a winding mechanism to produce a finished high density nonwoven fibrous material 12.

Example 1

High-density non-woven fiber material with unit area mass of 80g/m ² The density of the material is 0.9g/cm ³ The method comprises the steps of carrying out a first treatment on the surface of the As shown in fig. 1, the first adhesive layer 1, the first fiber layer 2, the second fiber layer 3, the third fiber layer 4 and the second adhesive layer 5 are sequentially included from top to bottom. The first sizing material layer 1 is attached to the surface of the first fiber layer 2, and the second sizing material layer 5 is attached to the surface of the third fiber layer 4; the first fiber layer 2, the second fiber layer 3 and the third fiber layer 4 are connected with each other; the fiber length in the first fiber layer 2 and the third fiber layer 4 is larger than that in the second fiber layer 3.

Wherein the sum of the mass of the first adhesive layer 1 and the second adhesive layer 5 accounts for 30 percent of the total mass of the material; the sum of the mass of the first fiber layer 2 and the third fiber layer 4 accounts for 40 percent of the total mass of the material; the mass of the second fiber layer 3 accounts for 30% of the total mass of the material.

The first adhesive layer 1 and the second adhesive layer 5 contain aqueous polyurethane and titanium powder; the second fiber layer 4 is wood pulp; the first fiber layer and the third fiber layer contain superfine fibers accounting for 20 percent of the total mass of the material and artificial cellulose fibers accounting for 20 percent of the total mass of the material. The mass of the first fiber layer is the same as that of the third fiber layer; wherein the superfine fiber is orange-petal split fiber, the components are polyester and polyamide, and the fineness after splitting is 0.1dtex. The artificial cellulose fibers in the first fiber layer and the third fiber layer are fine denier viscose fibers, the fineness of the fibers is 0.4dtex, and the length of the fibers is 25mm.

(1) Mixing superfine fiber and artificial cellulose fiber in proportion, and preparing the fiber into a thin fiber net by adopting a roller carding machine; then cross lapping is carried out to prepare a thick fiber web; the thick fiber web is drawn, the fiber arrangement direction is changed, the fibers are arranged in a disordered way, and the first fiber web and the third fiber web are respectively manufactured.

(2) The dry wood pulp paper coiled material is unreeled and then is fed between the first fiber net and the third fiber net to be overlapped, and the three-layer composite fiber net is manufactured.

(3) The three-layer composite fiber net is sent into a hydro-entangled system, the three-layer composite fiber net is pre-wetted, the front surface of the three-layer composite fiber net is hydro-entangled and reinforced by adopting a plurality of flat net hydro-entangled heads (wherein the hydro-entangled pressure of the flat net hydro-entangled heads is 25kg, 30kg and 35kg in sequence, and the back surface of the composite fiber net is hydro-entangled and reinforced by adopting a drum hydro-entangled method (wherein the drum hydro-entangled pressure is 25kg, 30kg and 35kg in sequence, so that the three-layer fiber net is solidified into a whole, the redundant water in the fiber net is removed by adopting a rolling method, and the material is dried by adopting a drying cylinder method (wherein the drying cylinder temperature is 80 ℃, 90 ℃ and 100 ℃ in sequence), so as to prepare the hydro-entangled base material 6).

(4) Feeding the spunlaced base material into a coating system, and respectively applying sizing materials to the front surface and the back surface of the spunlaced base material; curing the sizing material on the surface of the spunlaced base material through noise drying; wherein, the sizing material comprises the following components: 60% of waterborne polyurethane, 15% of titanium powder, 0.1% of defoamer, 7% of cross-linking agent, 15% of water and 3% of dispersant.

(5) Carrying out multi-zone calendaring treatment (wherein the calendaring temperature is 100 ℃ and the pressure is 0.1 Mpa) on the coated material, and then cooling the material by a cooling roller to iron the surface of the material; after being coiled, the mixture is prepared into 80g/m ² A high density nonwoven fibrous material.

As shown in fig. 2, the apparatus for producing a high-density nonwoven fibrous material comprises, in order of processing steps: a coating unit 7, a calendaring unit 8, a cooling unit 9, and a rolling unit 10; a plurality of cloth guide rollers 13 for conveying materials are arranged between the units. Wherein:

the coating unit sequentially comprises two coating subunits which are connected in series according to the processing procedure; each of the coating subunits includes a coating mechanism and a drying mechanism 705 in series according to a process sequence. The coating mechanism comprises an annular adhesive tape 702 capable of circularly rotating, a plurality of adhesive tape guide rollers 703 for driving and conveying the annular adhesive tape, a sizing mechanism 701 and a coating scraper 704, wherein the sizing mechanism 701 and the coating scraper 704 are arranged above the annular adhesive tape; the edge of the coating scraper is round; the drying mechanism is an infrared drying mechanism.

The calendaring unit comprises a plurality of front calendaring mechanisms and back calendaring mechanisms which are alternately arranged (two of each) according to the processing procedures. The front calendering mechanism comprises a front heat-conducting roller 801, a front press roller 802 matched with the front heat-conducting roller, and an upper pressurizing mechanism 803 connected above the front press roller. The back surface calendaring mechanism comprises a back surface heat conduction roller 804, a back surface pressing roller 805 matched with the back surface heat conduction roller, and a lower pressing mechanism 806 connected below the back surface pressing roller; the front side heat-conducting roller and the back side heat-conducting roller are connected with a heating system which is additionally arranged.

The cooling unit includes a pair of cooling rollers 901 fixed to the frame.

Example 2

High-density non-woven fiber material with unit area mass of 100g/m ² The density of the material is 1.0g/m ³ The method comprises the steps of carrying out a first treatment on the surface of the As shown in fig. 1, the first sizing material layer 1, the first fiber layer 2, the second fiber layer 3, the third fiber layer 4 and the second sizing material layer are sequentially arranged from top to bottom5, a step of; the first sizing material layer 1 is attached to the surface of the first fiber layer 2, and the second sizing material layer 5 is attached to the surface of the third fiber layer 4; the first fiber layer 2, the second fiber layer 3 and the third fiber layer 4 are connected with each other; the fiber length in the first fiber layer 2 and the third fiber layer 4 is larger than that in the second fiber layer 3.

Wherein the sum of the mass of the first adhesive layer 1 and the second adhesive layer 5 accounts for 30 percent of the total mass of the material; the sum of the mass of the first fiber layer 2 and the third fiber layer 4 accounts for 50 percent of the total mass of the material; the mass of the second fiber layer 3 accounts for 20 percent of the total mass of the material; the first adhesive layer 1 and the second adhesive layer 5 contain aqueous polyurethane and titanium powder; the second fiber layer 4 is plant pulp; the components are two combinations of wood pulp and cotton pulp; the first fiber layer and the third fiber layer contain superfine fibers accounting for 25 percent of the total mass of the material and artificial cellulose fibers accounting for 25 percent of the total mass of the material; the mass of the first fiber layer is the same as that of the third fiber layer; the superfine fibers in the first fiber layer and the third fiber layer are orange-petal split fibers; the components are polyester and polyamide, and the fineness after fiber opening is 0.3dtex; the artificial cellulose fibers in the first fiber layer and the third fiber layer are fine denier bamboo fibers; the fineness is between 0.6dtex, and the fiber length is 38mm.

A method for preparing a high density nonwoven fibrous material comprising the steps of:

(1) Mixing superfine fibers and fine denier bamboo fibers in proportion, and preparing the fibers into a thin fiber net by adopting a roller carding machine; then cross lapping is carried out to prepare a thick fiber web; drawing the thick fiber web, changing the arrangement direction of the fibers, and making the fibers into a first fiber web and a third fiber web respectively;

(2) Unreeling the dry plant pulp material, and then feeding the unreeled dry plant pulp material between the first fiber web and the third fiber web for superposition to prepare a three-layer composite fiber web;

(3) The three-layer composite fiber net is sent into a hydro-entangled system, the three-layer composite fiber net is pre-wetted, the front surface of the three-layer composite fiber net is hydro-entangled and reinforced by adopting a plurality of flat net hydro-entangled heads (wherein the hydro-entangled pressures of the flat net hydro-entangled heads are 40kg, 45kg and 50kg in sequence), and the back surface of the composite fiber net is hydro-entangled and reinforced by adopting a circular drum hydro-entangled (wherein the circular drum hydro-entangled pressures are 40kg, 45kg and 50kg in sequence), so that the three-layer fiber net is solidified into a whole; removing redundant water in the fiber web by adopting a rolling and drying mode; drying the material by adopting a drying cylinder mode (wherein the temperature of the drying cylinder is 120kg, 130kg and 135 ℃ to prepare a spunlaced base material;

(4) Feeding the spunlaced base material into a coating system, and respectively applying sizing materials to the front surface and the back surface of the spunlaced base material; curing the sizing material on the surface of the spunlaced base material through noise drying; wherein, the sizing material comprises the following components: 70% of waterborne polyurethane, 13% of titanium powder, 0.15% of defoamer, 6% of cross-linking agent, 10% of water and 1.85% of dispersant;

(5) Carrying out multi-zone calendaring treatment (wherein the calendaring temperature is 125 ℃ and the pressure is 0.3 Mpa) on the coated material, and then cooling the material by a cooling roller to iron the surface of the material; after being coiled, the mixture is prepared into a 100g/m ² A high density nonwoven fibrous material.

An apparatus for producing a high-density nonwoven fibrous material was the same as in example 1.

Example 3

High-density non-woven fiber material with unit area mass of 200g/m ² The density of the material is 1.1g/cm ^3，； The method comprises the steps of carrying out a first treatment on the surface of the As shown in fig. 1, the adhesive comprises a first adhesive layer 1, a first fiber layer 2, a second fiber layer 3, a third fiber layer 4 and a second adhesive layer 5 from top to bottom in sequence; the first sizing material layer 1 is attached to the surface of the first fiber layer 2, and the second sizing material layer 5 is attached to the surface of the third fiber layer 4; the first fiber layer 2, the second fiber layer 3 and the third fiber layer 4 are connected with each other; the fiber length in the first fiber layer 2 and the third fiber layer 4 is larger than that in the second fiber layer 3.

Wherein the mass of the first adhesive layer 1 and the second adhesive layer 5 accounts for 40 percent of the total mass of the materials; the mass of the first fiber layer 2 and the third fiber layer 4 accounts for 50 percent of the total mass of the material; the mass of the second fiber layer 3 accounts for 10 percent of the total mass of the material; the first adhesive layer 1 and the second adhesive layer 5 contain aqueous polyurethane and titanium powder; the second fiber layer 4 is plant pulp; the plant pulp is a combination of wood pulp and hemp pulp; the first fiber layer and the third fiber layer contain superfine fibers accounting for 30 percent of the total mass of the material and artificial cellulose fibers accounting for 30 percent of the total mass of the material; the mass of the first fiber layer is the same as that of the third fiber layer; the superfine fibers in the first fiber layer and the third fiber layer are orange-petal split fibers; the components are polyester and polyamide, and the fineness after fiber opening is 0.5dtex; the artificial cellulose fibers in the first fiber layer and the third fiber layer are fine denier tencel fibers; the fineness was 1.2dte and the fiber length was 50mm.

(1) Mixing superfine fibers and fine denier tencel fibers in proportion, and preparing the fibers into a thin fiber net by adopting a roller carding machine; then cross lapping is carried out to prepare a thick fiber web; drawing the thick fiber web, changing the arrangement direction of the fibers, and making the fibers randomly arranged to form a first fiber web and a third fiber web respectively;

(3) The three-layer composite fiber net is sent into a hydro-entangled system, the three-layer composite fiber net is pre-wetted, the front surface of the three-layer composite fiber net is hydro-entangled and reinforced by adopting a plurality of flat net hydro-entangled heads (wherein the hydro-entangled pressures of the flat net hydro-entangled heads are 35kg, 45kg, 55kg and 65kg in sequence), and the back surface of the composite fiber net is hydro-entangled and reinforced by adopting a drum hydro-entangled (wherein the drum hydro-entangled pressures are 35kg, 50kg and 65kg in sequence and the hydro-entangled pressure is gradually increased), so that the three-layer fiber net is solidified into a whole; removing redundant water in the fiber web by adopting a rolling and drying mode; drying the material by adopting a drying cylinder mode (wherein the temperature of the drying cylinder is 130 ℃, 140 ℃ and 150 ℃) to prepare a spunlaced base material;

(4) Feeding the spunlaced base material into a coating system, and respectively applying sizing materials to the front surface and the back surface of the spunlaced base material; curing the sizing material on the surface of the spunlaced base material through noise drying; wherein, the sizing material comprises the following components: 50% of waterborne polyurethane, 15% of titanium powder, 0.2% of defoamer, 7.8% of cross-linking agent, 25% of water and 2% of dispersing agent;

(5) Carrying out multi-zone calendaring treatment (wherein the calendaring temperature is 150 ℃ and the pressure is 0.4 Mpa) on the coated material, and then cooling the material by a cooling roller to iron the surface of the material; after being coiled, the mixture is prepared into 200g/m ² A high density nonwoven fibrous material.

Comparative example 1

Fiber material for printing, with gram weight of 100g/m ² The difference from example 2 is that the calendering temperature is 155℃and the pressure is 0.5MPa and the density is 1.2g/cm ³ 。

Comparative example 2

Fiber material for printing, with gram weight of 100g/m ² The difference from example 2 is that the calendering temperature is 90℃and the pressure is 0.05MPa and the density is 0.8g/cm ³ 。

Comparative example 3

Fiber material for printing, with gram weight of 100g/m ² The difference from example 2 is that the first and second adhesive layers use a propylene-based resin adhesive.

Comparative example 4

Fiber material for printing, with gram weight of 100g/m ² The difference from example 2 is that the intermediate second fiber layer content is 0, the first fiber layer and the third fiber layer content is 70%, and the third size layer content is 30%.

Comparative example 5

Fiber material for printing, with gram weight of 100g/m ² The difference from example 2 is that the first and second size layers are 0, the first and third fiber layers are 70% and the second fiber layer is 30%.

Performance test comparative analysis

Test item description:

(1) Density of material: the material density is the ratio of its weight to apparent volume (g/cm) ³ ) Directly affects the permeability and mechanical properties of the material. The calculation formula of the material density (R) is R=W/T.times.1000, wherein W is the unit area mass (g/m) ² ) T is the material thickness (mm).

(2) Tear strength: the fabric tear properties (trouser test-single seam) of textiles were tested according to GB/T3917.2-2009. According to the related literature and practical test summary, the tearing strength of the material is easy to tear by hands when the tearing strength is about 15N, and the material is difficult to tear after exceeding the tearing strength, and the lower the tearing strength is, the easier the tearing is.

(3) Printability: and printing the same section of manuscript by using a digital printer, and comparing the definition of the font outline to judge.

(4) Wash fastness: the washing mode is simulated by a washing machine for evaluation. The method comprises the following steps: 25 pieces of samples (size: 350 mm. Times.600 mm) were taken, 1ml of detergent and 160ml of bleaching agent were put in, and the time was once at 800rpm for 30min in a quick-wash mode at room temperature. Evaluation basis: the surface of the material is qualified after being washed by a washing machine without obvious cracks and damages.

(5) Elongation at break: according to GB/T24218.3/ISO 9073-3 (bar method), test specimens have a width of 50mm, a pre-tension of 0.00, a grip spacing of 100mm and a moving speed of 100mm.

Performance test results list

Analysis of test results:

(1) It can be seen from examples 1-3 that as the density of the material increases, the tear strength increases progressively, the material becomes more difficult to tear by hand, while the lower the elongation at break, the higher the wash fastness and the better the printability. In combination, the performance metrics of example 2 are optimal.

(2) As can be seen from comparative examples 1 and 2, when the range of the calendaring process limit is exceeded, the tearability of comparative example 1 becomes non-tearable, the printability of comparative example 2 becomes print blur (fig. 3 is a graph comparing the print effects of example 2 and comparative example 2), the wash fastness also becomes 8 times, the elongation at break increases, and the stiffness of the material decreases to cause easy deformation.

(3) As can be seen from comparative example 3, when the coating resin was changed from the aqueous polyurethane to the propylene resin under the same conditions, the washing resistance and printability were greatly reduced, the elongation at break was increased, and the material was easily deformed.

(4) As can be seen from comparative example 4, when the second fiber layer in the middle is removed, the content of long fiber and the content of the coating layer of the material are increased, the tearing strength of the material is increased, and the material is difficult to tear by hand, and meanwhile, the void fraction of the material is increased due to the fact that the filling effect of the ultra-short fiber is not provided, the material is easy to transmit light, the printability is reduced, and printing is fuzzy.

(5) As can be seen from comparative example 5, when the material is composed of 100% of fibers, since the upper and lower surfaces of the material have no adhesive layer, the surface flatness of the material is low, the printability of the material is seriously degraded, printing is unclear, and at the same time, tearing strength is increased, which is difficult to tear by hand. In addition, as the surface of the material is not protected by sizing materials, the material is uneven and hydrophobic, and the washing fastness is greatly reduced, so that the washing fastness test cannot be passed.

The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A high density nonwoven fibrous material characterized by: the multi-layer structure comprises a first adhesive layer (1), a first fiber layer (2), a second fiber layer (3), a third fiber layer (4) and a second adhesive layer (5) which are sequentially attached; the fiber length of the first fiber layer and the third fiber layer is larger than that of the second fiber layer, and the fibers of the adjacent fiber layers are mutually entangled; the density of the high-density non-woven fiber material is 0.9-1.0 g/cm ³ The method comprises the steps of carrying out a first treatment on the surface of the The unit area mass of the high-density non-woven fiber material is 80-200 g/m ² The method comprises the steps of carrying out a first treatment on the surface of the The first fiberThe layers and the third fiber layer contain superfine fibers accounting for 20-30% of the total mass of the material and artificial cellulose fibers accounting for 20-30% of the total mass of the material; the second fiber layer is prepared from plant pulp;

respectively preparing a first fiber web and a third fiber web from the raw materials of the first fiber layer and the raw materials of the third fiber layer, then sending the raw materials of the second fiber layer into the space between the first fiber web and the third fiber web to be overlapped to prepare a three-layer composite fiber web, and respectively forming the first fiber layer, the second fiber layer and the third fiber layer after water needling and drying;

The first adhesive layer and the second adhesive layer contain aqueous polyurethane and titanium powder;

the high-density non-woven fiber material is subjected to calendaring treatment, wherein the calendaring temperature is 100-150 ℃, and the pressure is 0.1-0.4 mpa.

2. The high density nonwoven fibrous material of claim 1, wherein:

the sum of the mass of the first adhesive layer and the second adhesive layer accounts for 20-40% of the total mass of the material;

the sum of the mass of the first fiber layer and the third fiber layer accounts for 40-60% of the total mass of the material;

the mass of the second fiber layer accounts for 10-30% of the total mass of the material.

3. The high density nonwoven fibrous material of claim 2, wherein:

the fineness of the fibers in the first fiber layer and the third fiber layer is 0.1-1.2 dtex, and the length of the fibers is 25-50 mm;

the ratio of the fiber length of the first fiber layer to the fiber length of the third fiber layer to the fiber length of the second fiber layer is 6-45.

4. A high density nonwoven fibrous material in accordance with claim 3, wherein:

the first fibrous layer and the third fibrous layer have the same mass.

5. The high density nonwoven fibrous material of claim 4 wherein:

the superfine fibers in the first fiber layer and the third fiber layer are orange-petal split fibers; the orange-peel split fibers comprise polyester and polyamide, and the fineness of the split fibers is 0.1-0.5 dtex;

The artificial cellulose fibers in the first fiber layer and the third fiber layer are one or more combinations of viscose fibers, bamboo fibers and tencel fibers, the fineness is 0.4-1.2 dtex, and the fiber length is 30-40 mm.

6. The high density nonwoven fibrous material of claim 1, wherein: the high-density non-woven fiber material has elongation at break of 0.5-1.8% in the longitudinal and transverse directions and light transmittance less than or equal to 10%.

7. A process for preparing a high density nonwoven fibrous material according to any one of claims 1 to 6, comprising the steps of:

(1) Mixing superfine fiber and man-made cellulose fiber, carding to prepare thin fiber net; then cross lapping is carried out to prepare a thick fiber web; drawing the thick fiber web, changing the arrangement direction of the fibers, and making the fibers randomly arranged to respectively prepare a first fiber web and a third fiber web;

(2) Feeding the dry plant pulp material into a first fiber web and a third fiber web to be overlapped to prepare a three-layer composite fiber web;

(3) Feeding the three-layer composite fiber web into a hydroentangling unit, and respectively hydroentangling the front side and the back side of the three-layer composite fiber web to consolidate the three-layer fiber web into a whole, so as to remove redundant moisture in the fiber web; drying the material to prepare a spiny base material;

(4) Feeding the spunlaced base material into a coating unit, and respectively applying sizing materials to the front surface and the back surface of the spunlaced base material; curing the sizing material on the surface of the spunlaced base material through noise drying;

(5) Carrying out calendaring treatment on the coated material to iron the surface of the material; and rolling to obtain the high-density non-woven fiber material.

8. The method of manufacturing according to claim 7, wherein:

in the step (1), a roller carding machine is adopted to card the mixed fibers;

in the step (3), the three-layer composite fiber net is pre-wetted, the front surface of the three-layer composite fiber net is reinforced by adopting a plurality of flat net water thorns, and the back surface of the three-layer composite fiber net is reinforced by adopting a circular drum water thorns; the water jet pressure of the flat net water jet heads is 35-65 kg, and the pressure of each flat net water jet head is gradually increased according to the advancing direction of the material; the hydraulic pressure of the drum is 35-65 kg; according to the advancing direction of the material, the hydraulic pressure of the drum is gradually increased;

in the step (3), removing redundant water in the fiber web in a roll drying mode;

in the step (3), the solidified fiber web is dried by adopting a drying cylinder mode; the temperature of the drying cylinder is 100-150 ℃; and the temperature of the drying cylinder is gradually increased according to the advancing direction of the material.

9. The method of manufacturing according to claim 7, wherein:

in the step (4), the sizing material comprises 50-70% of waterborne polyurethane, 10-15% of titanium powder, 0.1-0.2% of defoamer, 5-7% of cross-linking agent, 10-15% of water and 1-2% of dispersing agent;

in the step (5), the calendaring treatment adopts a multi-zone calendaring mode, and the material after hot rolling is cooled by a cooling roller.

10. The method of manufacturing according to claim 7, wherein: adopting a high-density non-woven fiber material production device to process the material;

the production device sequentially comprises the following steps of: a coating unit (7), a calendaring unit (8), a cooling unit (9) and a coiling unit (10);

the coating unit sequentially comprises one or more coating subunits connected in series according to the processing procedure; each coating subunit comprises a coating mechanism and a drying mechanism (705) which are connected in series according to the processing procedure;

the calendaring unit comprises a plurality of front calendaring mechanisms and back calendaring mechanisms which are alternately arranged according to the processing procedures;

the cooling unit comprises cooling rollers (901) arranged in pairs;

a plurality of cloth guide rollers (13) for conveying materials are arranged between the units;

the coating mechanism comprises an annular adhesive tape (702) capable of circularly rotating, a plurality of adhesive tape guide rollers (703) for driving and conveying the annular adhesive tape, a sizing mechanism (701) arranged above the annular adhesive tape and a coating scraper (704);

The front calendaring mechanism comprises a front heat conduction roller (801), a front press roller (802) matched with the front heat conduction roller, and an upper pressurizing mechanism (803) connected above the front press roller;

the back surface calendaring mechanism comprises a back surface heat conduction roller (804), a back surface compression roller (805) matched with the back surface heat conduction roller, and a lower pressing mechanism (806) connected below the back surface compression roller.