CN214387312U - Plant fiber dispersible material and production device thereof - Google Patents

Abstract

The utility model relates to the field of non-woven materials, and discloses a plant fiber dispersible material and a production device thereof, wherein the plant fiber dispersible material comprises an upper fiber layer (1), a middle fiber layer (2) and a lower fiber layer (3) which are mutually entangled and overlapped; wherein the average length of the fibers in the upper and lower fibrous layers is greater than the average length of the fibers in the middle fibrous layer; the raw materials of the upper fiber layer and the lower fiber layer are plant fibers; the raw material of the middle fiber layer is plant fiber pulp. The utility model discloses use natural plant fiber as the main material, can make the powerful, soft, the low vegetable fibre that falls bits volume of feeling of high wet process water thorn non-woven technology and break up the material.

Description

Plant fiber dispersible material and production device thereof

Technical Field

The utility model relates to a non-woven materials field especially relates to a plant fiber can break up material and apparatus for producing thereof.

Background

The wet toilet paper is a new flushable wet toilet paper. Compared with the common traditional toilet paper, the toilet paper has the advantages that the cleanness and the comfort are gradually accepted by consumers, the toilet paper becomes a revolutionary new product in the toilet paper field, and the toilet paper becomes a necessary household sanitary product for families pursuing the quality of life.

At present, the flushable materials used for producing wet toilet paper on the market are generally prepared by a wet spunlace process, the main components are wood pulp and man-made cellulose fibers, and most of the man-made cellulose fibers are viscose fibers, and the mass percentage of the viscose fibers can reach about 50%.

CN201811343535.3 discloses a production process of a flushable toilet non-woven fabric, which comprises the procedures of raw material preparation, paper making, spunlace reinforcement, drying, embossing and the like. This product adopts tencel short fiber and wood pulp as the raw materials, has guaranteed the flushability of product and the working strength of product, has guaranteed the fibrous effective tangle through controlling each water thorn pressure, can not destroy the inherent performance of fibre again, through control drying temperature, under the prerequisite of guaranteeing product quality, has improved the production efficiency of product. The scheme has the defects that the wet fracture strength is obviously reduced, wherein the wet fracture strength of 60 g/square meter material is 10-15N, and is only 33.3-42.8% of the dry fracture strength.

CN201810116131.4 discloses a flushable nonwoven material and a preparation method thereof, the flushable nonwoven material is prepared from 50-70 parts by weight of wood pulp fiber, 30-50 parts by weight of viscose fiber and 0.05-0.15 part by weight of adhesive, and the preparation method comprises the steps of dispersing, pulping, lapping, dehydrating, drying and the like. The flushable non-woven material provided by the scheme has the performances of higher strength, better softness performance, excellent moisture absorption performance, capability of quickly dispersing under the action of water flushing, capability of being biodegraded by 100% and the like, and can meet the flushable requirement and the actual use requirement. The scheme has the defects that the wet fracture strength of the product is lower, wherein the longitudinal wet strength of a product with the weight of 69 grams per square meter is 11.54N/5cm and is 62.8 percent of the longitudinal dry strength; the transverse wet strength was 7.32N/5cm, which was 43.8% of its transverse dry strength.

Viscose, a member of man-made cellulose fibers, has many advantages of cellulose fibers, such as excellent moisture absorption, biodegradability, and softness, and is a reason why it is widely used in flushable wet wipes. However, the wet strength of the viscose fiber is low, which is about 50% of the dry strength due to low polymerization degree, orientation degree and crystallinity of the viscose fiber, so that the improvement of the wet strength of the flushable wet toilet paper is greatly limited, and the popularization and the use of the viscose fiber are influenced.

In order to improve the wet fracture strength of flushable materials, companies in the field have proposed solutions to incorporate cotton fibers into the product. The cotton fiber is a natural fiber, people have a history of thousands of years on the application of the natural fiber, and the natural, skin-friendly and hypoallergenic concept of the cotton fiber per se is realized in the heart of consumers. The wet strength of the cotton fiber is far higher than that of the dry strength of the viscose fiber, and the use strength of the wet tissue capable of being dispersed can be effectively improved by introducing the cotton fiber into the dispersible material, so that the risk of being torn in use is reduced.

The cotton fiber is a natural plant fiber, has different fiber lengths and natural crimp, and cannot be directly used for wet-laid web. In the wet spunlace process, the crimp of the cotton fiber is not beneficial to dispersion in water, and the axial distortion of the cotton fiber is easy to cause the fiber to be flocculated and cohered, so that cotton blocks are easily formed in the process of stirring and conveying the slurry, and the product quality is influenced.

In view of the above problems in the prior art, it is not only necessary to develop a dispersible material using plant fibers as the main material to improve the wet fracture strength of the product, but also to solve the production technical problems encountered when applying plant fibers to dispersible materials to form a systematic preparation method, so that the product can be industrially produced, and the demand of improving the quality of dispersible materials in the market is met.

SUMMERY OF THE UTILITY MODEL

In order to solve the strong low, the compliance of the wet attitude of present ordinary flushable material is poor, easily fall bits and cause the poor, the many scheduling problems of fibre caking of product uniformity because of plant fiber length is inhomogeneous, the utility model provides a plant fiber can flushable material and apparatus for producing thereof, the utility model discloses use plant fiber as the main raw material, can make the strong, soft, the low plant fiber that falls the bits volume of high wet attitude and can break up the material. And the special wet spunlace non-weaving process of the device of the utility model can overcome the defect that wet-laid processing is difficult to realize due to different fiber lengths and natural curling.

The utility model discloses a concrete technical scheme does:

in a first aspect, the utility model provides a plant fiber flushable material, which comprises an upper fiber layer, a middle fiber layer and a lower fiber layer which are mutually entangled and overlapped; wherein the average length of the fibers in the upper and lower fibrous layers is greater than the average length of the fibers in the middle fibrous layer; the raw materials of the upper fiber layer and the lower fiber layer comprise chopped plant fibers and/or plant fiber short fibers; the raw material of the middle fiber layer comprises plant fiber pulp.

The short-cut plant fiber in the utility model is plant fiber with specific specification which is made by adopting natural plant fiber through the working procedures of longitudinal arrangement, mechanical cutting and the like. The utility model discloses a short cut plant fiber, plant fiber short hair, plant fiber pulp substitute viscose ultrashort fiber and wood pulp among the current material, for three layer construction, wherein short cut plant fiber, plant fiber short hair length in upper and lower two-layer are longer, and plant fiber pulp length in the middle level is shorter, and short cut plant fiber, plant fiber short hair in upper and lower fibrous layer are with the cladding of medial plant fiber pulp. By adopting the three-layer coating structure, the wet fracture strength of the material can be improved, and the risk of tearing the material in use is reduced; and the fineness of the surface of the material can be increased, and the softness of the material is improved. The specific principle is as follows: the long fibers are used on the upper layer and the lower layer, so that the loss of the short fibers in the middle layer can be reduced, and the retention rate of the fine fibers is improved in the inclined wire dewatering process and the spunlace process, and meanwhile, the probability of chip falling is lower due to the fact that the long fibers are coated in the using process; the middle layer plant fiber pulp can endow the material with a fluffy structure and excellent softness, and the average length of the fiber of the material is shorter, the material is softer and the thickness of the material is higher.

In addition, because the short-cut plant fiber and the plant fiber short staple fiber of the utility model have the length higher than that of the viscose ultrashort fiber and the wood pulp in the common dispersible material, the fiber falling can be reduced, and the chip falling performance of the material is effectively improved.

Preferably, the chopped plant fibers comprise chopped cotton fibers and chopped hemp fibers.

In general, when a fiber (such as viscose fiber) is in a wet state, the interaction between macromolecules is weakened, and the molecules are easy to change and slide, so that the strength and the modulus of the fiber are reduced, and the elongation of the fiber is increased. However, natural cotton fibers and hemp fibers have larger molecular weight, and when the fibers are stressed in a wet state, the number of load-bearing macromolecular chains is increased, so that the strength of the fibers is increased. Therefore, some natural plant fibers such as cotton fibers and hemp fibers have higher wet strength than dry strength, and the fibers become soft after moisture absorption, increase plastic deformation and increase friction coefficient. The characteristics of the natural cotton fiber and the fibrilia are consistent with the purpose of improving the wet strength of the flushable material.

More preferably, the chopped plant fibers are chopped cotton fibers.

Preferably, the plant fiber pulp comprises cotton pulp and hemp pulp. The plant fiber short velvet is cotton short velvet.

Preferably, the length of the chopped plant fiber is 3-15 mm; the length of the fiber in the plant fiber pulp is 0.5-4 mm; the average length of the cotton linters is 3-6 mm, wherein fibers of 3mm or less account for less than 58% of the total mass. The utility model discloses limit fibre length at above-mentioned scope because the fibre is too short can not provide corresponding brute force for the material, and the overlength can lead to the material uniformity variation. More preferably, the chopped cotton fibers are chopped absorbent cotton fibers, and the average fiber length is 4-8 mm.

The utility model discloses used plant fiber is natural fiber, the fiber length diverse of own, and wherein, the too short brute force that can influence the product of fiber length, and fiber length overlength then can make the product degree of consistency variation. Therefore, the utility model discloses a cut the mode of handling to natural plant fiber short, cut into specific length with natural plant fiber, can effectively improve plant fiber length's homogeneity. In addition, carry out the strict control to the average length of cutting the plant fiber by short, can be favorable to more realizing the utility model discloses a technological effect.

Preferably, the plant fiber dispersible material has a mass per unit area of 30-90 g/square meter.

In a second aspect, the utility model provides a plant fiber can break up material apparatus for producing, include: the device comprises a fiber mixed slurry preparation unit, a pulp mixed slurry preparation unit, a fiber net overlapping unit and a spunlace unit.

The fiber web superposing unit comprises a frame, a multi-layer inclined wire former, a forming wire, a dewatering device, a pre-water needling head and a vacuum suction device; the forming wire is arranged on the frame to form a loop capable of circularly rotating, and the multilayer inclined wire former, the dewatering device, the pre-water needling head and the vacuum suction device are sequentially arranged on the frame along the rotating direction of the forming wire; the input end of the multilayer inclined wire former is provided with an upper layer sizing device, a middle layer sizing device and a lower layer sizing device; the input ends of the upper layer sizing device and the lower layer sizing device are connected with the output end of the fiber mixed slurry preparation unit; the input end of the middle layer sizing device is connected with the output end of the pulp mixed slurry preparation unit.

The spunlace unit comprises a flat screen spunlace mechanism and a circular drum spunlace mechanism which are arranged in front of and behind the process; the flat screen spunlace mechanism and the round drum spunlace mechanism are used for spunlacing different surfaces of the laminated fiber web respectively; the flat-web hydroentangling mechanism is butted with a forming web in the fiber web overlapping unit.

Preferably, the fiber mixed pulp preparation unit comprises an opening scutcher, a carding machine, a fiber cutting machine, a fiber pulping tank, a first fan pump and a first pulp distributor which are sequentially connected; and the input ends of the upper layer sizing device and the lower layer sizing device are connected with the output end of the first slurry distributor.

Preferably, the pulp mixed slurry preparation unit comprises a pulp pulping tank, a second fan pump and a second slurry distributor which are connected in sequence; the input end of the middle layer sizing device is connected with the output end of the second slurry distributor.

Preferably, a push type stirrer and a slit filtering device are arranged in both the fiber pulping tank and the pulp pulping tank.

Preferably, the flat-screen spunlace mechanism comprises a screen supporting curtain forming a circular rotating loop and a plurality of flat-screen spunlace heads arranged on the outer side of the screen supporting curtain.

Preferably, the circular drum spunlace mechanism comprises a circular drum and a plurality of circular drum spunlace heads facing the circumferential surface of the circular drum.

In a third aspect, the utility model provides a preparation method of plant fiber dispersible material, which comprises the following steps: 1) preparing chopped plant fibers: opening one or more plant fibers to remove impurities, longitudinally finishing the opened plant fibers to enable the curled plant fibers to be combed into a straight state, and manufacturing plant fiber strips; cutting the plant fiber strips to prepare the chopped plant fibers.

2) Preparing slurry of the upper fiber layer and the lower fiber layer: adding the chopped plant fibers and/or plant fiber flock into water, stirring to disperse the fibers, and removing flocculent fiber groups and neps to prepare fiber mixed slurry with the concentration of 0.1-2 wt%.

3) Preparation of middle fiber layer slurry: adding water into the plant fiber pulp, stirring and disintegrating to prepare pulp mixed slurry with the concentration of 0.1-2 wt%.

4) Preparation of a laminated fiber web: respectively diluting the fiber mixed pulp and the pulp mixed pulp, then respectively distributing the pulp, and sending the fiber mixed pulp into an upper layer sizing device and a lower layer sizing device of a multilayer inclined wire former; feeding the pulp mixed slurry into a middle layer sizing device of a multilayer inclined wire former, overlapping each layer of fiber net according to the sequence of upper, middle and lower, preparing an overlapped fiber net after dehydration, and performing pre-consolidation on the overlapped fiber net by pre-spunlace; the laminated web is then dewatered again to control moisture content.

5) Reinforcing the fiber net: and carrying out multiple spunlace processes on the front surface and the back surface of the dehydrated laminated fiber web, removing excessive water in the material, drying, coiling and preparing the plant fiber dispersible material.

The slurry of the upper layer, the slurry of the middle layer and the slurry of the lower layer enter upper layer flow boxes, middle layer flow boxes and lower layer flow boxes corresponding to the inclined wire through the slurry distributor, and the fiber web with a stable three-layer structure can be obtained only by controlling the pressure in the three-layer flow boxes to be consistent.

The upper layer and the lower layer of the material use long fibers, the middle layer uses short fibers, and the sandwich structure enables the short fibers in the middle layer to be coated by the long fibers, so that the chip falling amount is reduced. Macroscopically, the wet strength of the product can be improved by replacing viscose with plant fibers such as cotton fibers and the like, because the wet strength of the viscose is not as good as that of the plant fibers such as the cotton fibers and the like; from the microcosmic, the fibre is more with the tangle of fibre, cohesion point, and fastness between each other is just also big more, and wet brute force is just also big more futilely, and twine how much of knot, cohesion point and need fiber length to go the support, so the sandwich structure that this scheme provided can effectual promotion long fiber and the probability of long fiber contact, increases the cohesion point of product to promote wet brute force futilely.

The pulp staple fibers in the middle layer can give the material a fluffy structure and excellent softness. According to research, under the condition that the fiber specifications are consistent, the material is softer and has higher thickness when the average length of the fiber is shorter;

preferably, in step 1), opening is performed by using an opening picking machine with a saw-toothed roller.

By adopting the mode, the fibers can be opened in a held state, so that the fibers with excellent opening state can be obtained.

Preferably, in the step 2), a slit filter device is adopted to remove flocculent fibers and neps; and mixing the filtered flocculation fibers and neps with the raw materials in the step 3) for disintegration.

The plant fiber inevitably produces neps during carding, and meanwhile, the fiber is also provided with longer fiber residues after being cut by the cutting device, and the process is used for removing the neps and the long fiber.

Preferably, in the step 3), the plant fiber pulp is disintegrated and then is subjected to multi-pass disc grinding to prepare pulp mixed slurry; feeding the obtained pulp mixed slurry into a slit filtering device, dispersing fiber groups flocculated in the slurry, and removing neps to make the fibers in a single fiber state.

The purpose of multi-pass disc milling is to make pulp have more excellent dispersibility and better forming evenness. And (3) feeding the pulp mixed slurry into a slit filtering device, wherein neps and floccules generated in the stirring process of the mixed slurry are removed.

Preferably, in the step 4), the concentration of the diluted slurry is controlled to be 0.2-0.4 per mill.

The slurry is diluted to the concentration of 0.2 per mill to 0.4 per mill, so that the requirement of the inclined wire forming on the net can be met.

Preferably, the moisture content of the laminated fiber web after dehydration is controlled to be 50-65%.

The moisture content of the web directly affects the strength of the web, and the moisture content of the web is controlled to be 50-65%, so that the transfer of the low-gram-weight (below 45 gsm) web is facilitated, and the normal production is ensured.

Preferably, the pre-hydroentangling pressure is 20 to 40 bar.

The fiber web is given a certain strength by the pre-spunlacing, and the service life of the inclined web is reduced by the excessively high pre-needling pressure.

Preferably, in the step 5), the plurality of spunlacing processes adopt a mode of combining flat-screen spunlacing and round-drum spunlacing; coating a nickel-plated steel wire mesh on the spunlace round drum; the spunlace pressure is 20-80 bar, and the spunlace pressure of a plurality of spunlaces is carried out according to the sequence of low pressure, high pressure and low pressure.

The method is characterized in that low-pressure spunlace gives basic strength to a fiber web to prevent fibers from shifting to damage the cloth cover effect under high-pressure spunlace, the high-pressure spunlace gives strength to the fiber web, and the last low-pressure spunlace is used for modifying the cloth cover to make the appearance of the cloth cover better. That is to say, the first low pressure spunlace gives the fiber web basic strength, prevents the problems of serious laminar flow loss and chip falling of the intermediate pulp caused by the damage of the cloth cover effect of the upper and lower coating layers by the high pressure spunlace, and makes the cloth cover more beautiful by the last low pressure spunlace for modifying the cloth cover.

The nickel-plated steel wire mesh is selected to reduce the risk of fiber sticking and improve the stability of the product with low gram weight (below 45 gsm).

Can fully consolidate the fiber web and reduce the pulp loss and ultra-short fiber web adhesion in the spunlace process.

Preferably, the excess moisture is removed from the material by vacuum suction.

The suction dehydration is beneficial to protecting the thickness of the material, so that the material is full and thick, and the softness of the material is improved.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a short cut plant fiber, plant fiber short hair, plant fiber pulp substitute viscose ultrashort fiber and wood pulp among the current material to adopt three-layer cladding structure, short cut plant fiber, plant fiber short hair in its upper and lower fibrous layer are with medial plant fiber pulp cladding, have improved the wet fracture brute force that can break up the material, have improved the compliance of material, have reduced the material and have used by tearing risk, have promoted the consumption experience that can break up the product and feel.

(2) The utility model discloses the short cut plant fiber that well adopted, plant fiber short flannel fiber length are higher than ordinary can break up viscose ultra-short fiber and wood pulp in the material, consequently, the preventing of material in the use fall bits nature better, fall bits volume littleer.

(3) The utility model discloses in adopt chopped strand plant fiber, plant fiber short staple fibre as the contact layer in the use, because above-mentioned fiber length is 2-3 times of pulp fiber length, make the fibre tangle inseparabler, consequently, what the material prevented in the use falls the bits nature better, fall the bits volume littleer.

(4) Viscose fiber can generate a large amount of waste water in the production process, and causes pollution to the environment; and the utility model discloses a cotton fiber replaces for natural fiber, and raw and other materials environmental protection more belongs to environment-friendly type product, accords with green development theory.

(5) The utility model discloses cutting off after vertically arranging natural plant fiber, carrying out the wet laid again after making short cut plant fiber, solved because natural plant fiber length differs, itself has natural curling, can not directly be used for the problem of wet laid, provide effectual solution for plant fiber uses wet spunlace processing.

Drawings

FIG. 1 is a schematic structural view of the plant fiber dispersible material of the present invention;

fig. 2 is a schematic structural diagram of the plant fiber dispersible material production device of the present invention.

The reference signs are: an upper fiber layer 1, a middle fiber layer 2, a lower fiber layer 3, a plant fiber scattering material 4, a frame 11, a multilayer inclined wire former 12, a forming wire 13, a dewatering device 14, a pre-spunlace head 15, a vacuum suction device 16, an upper sizing device 17, a middle sizing device 18, a lower sizing device 19, an opening scutcher 21, a carding machine 22, a fiber cutting machine 23, a fiber sizing tank 24, a first pulp pump 25, a first pulp distributor 26, a pulp sizing tank 31, a second pulp pump 32, a second pulp distributor 33, a net supporting curtain 41, a flat net spunlace head 42, a circular drum 43 and a circular drum spunlace head 44.

Detailed Description

The present invention will be further described with reference to the following examples.

General examples

A plant fiber dispersible material has a unit area mass of 30-90 g/square meter as shown in figure 1, and comprises an upper fiber layer 1, a middle fiber layer 2 and a lower fiber layer 3 which are mutually entangled and overlapped. Wherein the average length of the fibers in the upper and lower fibrous layers is greater than the average length of the fibers in the middle fibrous layer; the raw materials of the upper fiber layer and the lower fiber layer comprise chopped plant fibers and/or plant fiber short fibers; the raw material of the middle fiber layer comprises plant fiber pulp.

The length of the short-cut plant fiber is 3-15 mm, and the short-cut plant fiber comprises short-cut cotton fiber and short-cut hemp fiber; preferably chopped cotton fibers; the chopped absorbent cotton fibers are further preferred, and the average fiber length is 4-8 mm.

The length of the plant fiber pulp is 0.5-4 mm, and the plant fiber pulp comprises cotton pulp and hemp pulp; the plant fiber short velvet is cotton short velvet; the average length of the cotton linters is 3-6 mm, wherein fibers of 3mm or less account for less than 58% of the total mass.

A preparation method of a plant fiber dispersible material comprises the following steps:

1) preparing chopped plant fibers: opening and removing impurities of one or more plant fibers by using an opening scutcher with a saw-tooth roller, longitudinally finishing the opened plant fibers to enable the curled plant fibers to be combed into a straight state, and manufacturing plant fiber strips; cutting the plant fiber strips to prepare the chopped plant fibers.

2) Preparing slurry of the upper fiber layer and the lower fiber layer: adding the chopped plant fibers and/or plant fiber flock into water, stirring to disperse the fibers, removing flocculent fiber groups and neps by using a slit filtering device to prepare fiber mixed slurry with the concentration of 0.1-2 wt%, and mixing the filtered flocculent fiber groups and neps with the raw materials in the step 3) for disintegration.

3) Preparation of middle fiber layer slurry: adding water into the plant fiber pulp, stirring and disintegrating, and then performing multi-channel disc grinding to prepare pulp mixed slurry; and (3) feeding the pulp mixed slurry into a slit filtering device, dispersing fiber groups flocculated in the slurry, removing neps, and making the fibers in a single fiber state to prepare the pulp mixed slurry with the concentration of 0.1-2 wt%.

4) Preparation of a laminated fiber web: respectively diluting the fiber mixed slurry and the pulp mixed slurry to the concentration of 0.2-0.4 per mill, then respectively distributing the slurry, and sending the fiber mixed slurry into an upper layer sizing device and a lower layer sizing device of a multilayer inclined wire former; feeding the pulp mixed slurry into a middle layer sizing device of a multilayer inclined wire former, overlapping each layer of fiber web according to the sequence of upper, middle and lower, dehydrating to prepare an overlapped fiber web, and performing pre-spunlace (the pre-spunlace pressure is 20-40 bar) to perform pre-consolidation on the overlapped fiber web; and then, dewatering the laminated fiber web again to control the water content to be 50-65%.

5) Reinforcing the fiber net: and (3) carrying out multiple spunlacing on the front surface and the back surface of the dehydrated laminated fiber web (firstly carrying out flat-web spunlacing and then carrying out round drum spunlacing, wherein the spunlacing pressure is 20-80 bar, and the spunlacing pressure of the multiple spunlacing is carried out according to the sequence of low pressure, high pressure and low pressure), then carrying out vacuum suction to remove excessive moisture in the material, drying, and coiling to obtain the plant fiber flushable material.

The above preparation is performed by using a plant fiber dispersible material production apparatus, as shown in fig. 2, the plant fiber dispersible material production apparatus includes: the device comprises a fiber mixed slurry preparation unit, a pulp mixed slurry preparation unit, a fiber net overlapping unit and a spunlace unit.

The fiber mixed slurry preparation unit comprises a scutcher 21, a carding machine 22, a fiber cutting machine 23, a fiber pulping tank 24, a first fan pump 25 and a first pulp distributor 26 which are connected in sequence.

The pulp mixed slurry preparation unit comprises a pulp pulping tank 31, a second fan pump 32 and a second slurry distributor 33 which are connected in sequence.

The fiber web superposition unit comprises a frame 11, a multi-layer inclined wire former 12, a forming wire 13, a dewatering device 14, a pre-water needling head 15 and a vacuum suction device 16; the forming wire is arranged on the frame to form a loop capable of circularly rotating, and the multilayer inclined wire former, the dewatering device, the pre-water needling head and the vacuum suction device are sequentially arranged on the frame along the rotating direction of the forming wire; the input end of the multilayer inclined wire former is provided with an upper layer sizing device 17, a middle layer sizing device 18 and a lower layer sizing device 19; the input ends of the upper layer sizing device and the lower layer sizing device are connected with the output end of the first slurry distributor; the input end of the middle layer sizing device is connected with the output end of the second slurry distributor.

The spunlace unit comprises a flat screen spunlace mechanism and a circular drum spunlace mechanism which are arranged in front of and behind the process; the flat screen spunlace mechanism and the round drum spunlace mechanism are used for spunlacing the front and back surfaces of the laminated fiber web respectively; the flat-web hydroentangling mechanism is butted with a forming web in the fiber web overlapping unit. The flat-screen spunlace mechanism comprises a screen supporting curtain 41 forming a circular rotating loop and three flat-screen spunlace heads 42 arranged on the outer side of the screen supporting curtain. The drum hydroentangling mechanism comprises a drum 43 and two drum hydroentangling heads 44 facing the circumferential surface of the drum. The round drum is coated with a nickel-plated steel wire mesh.

The utility model discloses in, all be equipped with impulse type agitator in each jar of the inside body of fibre pulping jar.

Example 1

A plant fiber dispersible material has a mass per unit area of 54.7 g/square meter, and comprises an upper fiber layer, a middle fiber layer and a lower fiber layer which are mutually overlapped and connected; wherein the upper fiber layer and the lower fiber layer are composed of short absorbent cotton fibers and absorbent cotton linters with average length of 5 mm; the middle fiber layer is made of cotton pulp with the average length of 2.3 mm; the fibers in the upper, middle and lower layers are intertwined. Wherein the mass of the upper fiber layer and the lower fiber layer respectively accounts for 15 percent of the mass of the material, and the mass of the middle fiber layer accounts for 70 percent of the mass of the material.

Example 2

A plant fiber dispersible material has a mass per unit area of 30 g/square meter, and comprises an upper fiber layer, a middle fiber layer and a lower fiber layer which are mutually overlapped and connected; wherein the upper fiber layer and the lower fiber layer are formed by chopped hemp fibers with the average length of 8 mm; the middle fiber layer is composed of hemp fiber pulp with the average length of 2mm and cotton pulp with the average length of 2.3 mm; the fibers in the upper, middle and lower layers are intertwined. Wherein the mass of the upper fiber layer and the lower fiber layer respectively accounts for 20 percent of the mass of the material, and the mass of the middle fiber layer accounts for 60 percent of the mass of the material.

Example 3

A plant fiber dispersible material has a mass per unit area of 90 g/square meter, and comprises an upper fiber layer, a middle fiber layer and a lower fiber layer which are mutually overlapped and connected; wherein the upper fiber layer and the lower fiber layer are composed of 50% of short-cut cotton fibers and 50% of short-cut hemp fibers, and the average fiber lengths of the short-cut cotton fibers and the short-cut hemp fibers are respectively 4mm and 8 mm; the middle fiber layer is composed of 50% of hemp pulp and 50% of cotton pulp, wherein the average fiber length of the hemp pulp is 2mm, and the average fiber length of the cotton pulp is 2.3 mm; the fibers in the upper, middle and lower layers are intertwined.

The raw materials and the equipment used in the utility model are common raw materials and equipment in the field if no special description is provided; the methods used in the present invention are conventional methods in the art unless otherwise specified.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.

Claims (10)

1. A plant fiber dispersible material is characterized in that: comprises an upper fiber layer (1), a middle fiber layer (2) and a lower fiber layer (3) which are mutually entangled and superposed; wherein the average length of the fibers in the upper and lower fibrous layers is greater than the average length of the fibers in the middle fibrous layer; the raw materials of the upper fiber layer and the lower fiber layer are plant fibers; the raw material of the middle fiber layer is plant fiber pulp.

2. The plant fiber flushable material of claim 1, wherein:

the plant fiber is chopped plant fiber or plant fiber short velvet; the chopped plant fiber is chopped cotton fiber or chopped hemp fiber; the plant fiber pulp is cotton pulp or hemp pulp; the plant fiber short velvet is cotton short velvet; and/or

The length of the short-cut plant fiber is 3-15 mm; the length of the fiber in the plant fiber pulp is 0.5-4 mm; the average length of the cotton linters is 3-6 mm.

3. The plant fiber flushable material of claim 2, wherein: the chopped plant fiber is chopped cotton fiber.

4. A plant fibre dispersible material according to claim 3 wherein: the short-cut cotton fiber is short-cut absorbent cotton fiber, and the average fiber length is 4-8 mm.

5. The plant fiber flushable material of claim 1, wherein: the plant fiber dispersible material has a mass per unit area of 30-90 g/square meter.

6. A production apparatus for preparing the plant fiber flushable material of any one of claims 1 to 5, comprising: the device comprises a fiber mixed slurry preparation unit, a pulp mixed slurry preparation unit, a fiber mesh superposition unit and a spunlace unit;

the fiber web superposing unit comprises a frame (11), a multi-layer inclined wire former (12), a forming wire (13), a dewatering device (14), a pre-water needling head (15) and a vacuum suction device (16); the forming wire is arranged on the frame to form a loop capable of circularly rotating, and the multilayer inclined wire former, the dewatering device, the pre-water needling head and the vacuum suction device are sequentially arranged on the frame along the rotating direction of the forming wire; the input end of the multilayer inclined wire former is provided with an upper layer sizing device (17), a middle layer sizing device (18) and a lower layer sizing device (19); the input ends of the upper layer sizing device and the lower layer sizing device are connected with the output end of the fiber mixed slurry preparation unit; the input end of the middle layer sizing device is connected with the output end of the pulp mixed slurry preparation unit;

the spunlace unit comprises a flat screen spunlace mechanism and a circular drum spunlace mechanism which are arranged in front of and behind the process; the flat screen spunlace mechanism and the round drum spunlace mechanism are used for spunlacing different surfaces of the laminated fiber web respectively; the flat-web hydroentangling mechanism is butted with a forming web in the fiber web overlapping unit.

7. The production apparatus as claimed in claim 6, wherein: the fiber mixed pulp preparation unit comprises an opening scutcher (21), a carding machine (22), a fiber cutting machine (23), a fiber pulping tank (24), a first fan pump (25) and a first pulp distributor (26) which are connected in sequence; and the input ends of the upper layer sizing device and the lower layer sizing device are connected with the output end of the first slurry distributor.

8. The production apparatus as claimed in claim 6, wherein: the pulp mixed slurry preparation unit comprises a pulp pulping tank (31), a second fan pump (32) and a second slurry distributor (33) which are connected in sequence; the input end of the middle layer sizing device is connected with the output end of the second slurry distributor.

9. The production apparatus as claimed in claim 6, wherein:

the flat screen spunlace mechanism comprises a screen supporting curtain (41) forming a circular rotating loop and a plurality of flat screen spunlace heads (42) arranged on the outer side of the screen supporting curtain; and/or

The drum spunlace mechanism comprises a drum (43) and a plurality of drum spunlace heads (44) facing the circumferential surface of the drum.

10. The production apparatus according to claim 7, wherein: and the fiber pulping tank and the pulp pulping tank are internally provided with a push type stirrer and a slit filtering device.

Images