TWI726881B - Pulp fiber accumulation sheet and manufacturing method of pulp fiber accumulation sheet - Google Patents

Abstract

The present invention is a pulp fiber accumulation sheet. It has a liquid-permeable pulp fiber accumulation layer containing raw material fibers composed of pulverized pulp or mainly pulverized pulp and a binder, and is provided with a plurality of fiber crimping parts formed by compression and pressing, and exists across and adjacent The way of crushing the pulp fibers of the fiber crimping part forms the fiber crimping part.

Description

Pulp fiber accumulation sheet and manufacturing method of pulp fiber accumulation sheet

The present invention relates to a pulp fiber accumulation sheet that can be used as a cleaning sheet, and a manufacturing method thereof.

Regarding wet wipes, there are those consisting of a first layer composed of a tissue web containing cellulose fibers and a second layer composed of an airlaid nonwoven web (refer to Patent Document 1, Scope of Patent Application, Scope of Patent Application 11 item).

In this patent document 1, an adhesive which integrates both the first layer (obtained by papermaking) and the second layer (obtained by the air-laid method) which is different from the production method is required. In addition, the above-mentioned first layer imparts strength to the wet tissue, but reduces its softness.

Patent Document 1: US Patent No. 8257553

The main problem to be solved by the present invention is to provide a pulp fiber accumulation sheet that can be manufactured without a papermaking step, can maintain its shape even if it is not formed into a laminate with a sheet obtained by papermaking, and has an appropriate strength.

In order to achieve the above-mentioned problems, in the present invention, the pulp fiber accumulation sheet is made as follows: it has raw material fibers composed of pulverized pulp or mainly composed of pulverized pulp, and a binder The liquid-permeable pulp fiber accumulation layer is provided with a plurality of fiber crimping portions formed by compression and pressing, and the fiber crimping portion is formed in such a way that there are pulverized pulp fibers that span the adjacent fiber crimping portions .

One of the preferable aspects is that the content of the binder relative to the liquid-permeable pulp fiber accumulation layer is set to be in the range of 1-20% by weight. In addition, one of the preferred aspects is that the above-mentioned binder is carboxymethyl cellulose. In addition, one of the preferred aspects is that the above-mentioned binder is made of polyvinyl alcohol. One of the preferred aspects is that the pulp fiber accumulation sheet is further impregnated with a cleaning liquid and is in a wet state. In addition, one of the preferred aspects is that the above-mentioned adhesive is contained in a cross-linked state. In addition, one of the preferred aspects is that the compression and pressing portions are formed by embossing.

In addition, in order to achieve the above-mentioned problem, in the present invention, the method for manufacturing a pulp fiber accumulation sheet is as follows, that is, it has a fiber accumulation step in which raw fibers composed of pulverized pulp or mainly composed of pulverized pulp are made by suction. Stacked on the mesh body to form a fiber accumulation body; in the crimping and pressing steps, by compressing and pressing, the obtained fiber accumulation body is obtained in a way that there are pulverized pulp fibers spanning adjacent fiber crimping parts , Forming a plurality of fiber crimping parts on the fiber accumulation body; the adhesive coating step, applying an adhesive to at least one surface of the fiber accumulation body on which the fiber crimping part is formed; and a drying step, coating the adhesive After the cloth step, the fiber accumulation body is dried to become a liquid-permeable pulp fiber accumulation layer.

One of the preferred aspects is that the adhesive coating step includes applying adhesive to both sides of the fiber accumulation body. In addition, one of the preferred aspects is that the above-mentioned crimping and pressing steps are set To be carried out by embossing rollers. In addition, one of the preferred aspects is to further press the flat roller before performing the crimping and pressing steps by using the embossing roller. In addition, one of the preferred aspects is that the above-mentioned drying step is performed by electromagnetic wave drying. In addition, one of the preferred aspects is that the above-mentioned binder is carboxymethyl cellulose. In addition, one of the preferred aspects is that the above-mentioned binder is made of polyvinyl alcohol.

In addition, the manufacturing method of claim 15, which uses pulverized raw fiber to produce a fiber accumulation sheet, including the steps of: applying a binder to the raw fiber from a first direction, and adsorbing the raw fiber in the first direction; and The raw material fibers are coated with a binder from a second direction different from the first direction, and the raw material fibers are adsorbed in the second direction.

The pulp fiber accumulation sheet of the present invention can be manufactured without a papermaking step, and even if it is not formed as a laminate with a sheet obtained by papermaking, the shape can be maintained, and it has appropriate strength.

1: Pulp fiber stacking sheet

2: Liquid-permeable pulp fiber accumulation layer

2a: Fiber crimping part

2b: crushed pulp fiber

3: The original sheet of pulp material

4: The winding body of the pulp fiber accumulation sheet

5: crushed pulp

6: Crushing device

6a: Fixed knife

6b: Rotary knife

7: Fiber accumulation device

7a: Conveyor belt

7b: unloading end

8: Flat roller

9: Embossing roller

10: Conveyor

11: Conveyor

12: Spray nozzle

13: Drying device

14: Cutting roller

100: production line

101: Pulp fiber accumulation sheet

103: Pulp fiber

104: Liquid supply device

104a: Central area

105: Pulp detection device

105a: detection light

106: Crushing Device

107: Fiber stacking device

107a: Slot

107b: Slot

107c: Slot

108: Piping

109: Lower transport net

110: Roll

111: vacuum device

112: Flat roller

113: Upper transport net

114: Roll

115: vacuum device

116: Flat Roll

117: embossing roller

118: Embossing roller

119: Roll

120: vacuum device

121: The first coating device

122: lower side transport net

123: Roll

124: The first drying device

125: vacuum device

126: embossing roller

127: Upper transport net

128: Roll

129: Vacuum device

130: The second coating device

131: Upper transport net

132: Vacuum device

133: The second drying device

134: Roll

135: Conveying roller

136: take-up roller

137: take-up roller

Fig. 1 is a three-dimensional structural view of a pulp fiber accumulation sheet according to an embodiment of the present invention.

Fig. 2 is a cross-sectional configuration diagram of the main part of the above-mentioned pulp fiber accumulation sheet.

Fig. 3 is a perspective view of the structure of a pulp fiber accumulation sheet in which the fiber crimping portion is linear.

Fig. 4 is a schematic diagram showing an example of the manufacturing process of the above-mentioned pulp fiber accumulation sheet.

Fig. 5 is a diagram showing a schematic view of the production line 100 of the pulp fiber accumulation sheet 101 of the second embodiment.

Figure 6 is a schematic diagram of the liquid supply step and the pulp detection step.

Fig. 7 is a schematic diagram showing cotton-like pulp fibers 103 for fiber accumulation.

Hereinafter, a typical embodiment of the present invention will be described based on FIGS. 1 to 7. The pulp fiber accumulation sheet 1 of this embodiment is composed of one or two or more liquid-permeable pulp fiber accumulation layers 2. Typically, it is suitable for use as a non-hydrolyzable cleaning sheet for cleaning or as a hydrolyzable cleaning sheet for body cleaning. Use sheets, toilet paper and other hydrolyzable cleaning sheets. In addition, the manufacturing method of this embodiment can manufacture the above-mentioned pulp fiber accumulation sheet 1 reasonably and appropriately.

The pulp fiber accumulation sheet 1 has a liquid-permeable pulp fiber accumulation layer 2 containing raw material fibers composed of pulverized pulp 5 or mainly pulverized pulp 5, and a binder, and has a plurality of fiber presses formed by compression and pressing. The bonding portions 2a, 2a..., and the fiber crimping portion 2a is formed such that there are pulverized pulp fibers 2b spanning the adjacent fiber crimping portions 2a, 2a.

The liquid-permeable pulp fiber accumulation layer 2 is composed of an aggregate of a plurality of fibers and has water absorption. The liquid-permeable pulp fiber accumulation layer 2 can be formed by natural fibers such as pulp, regenerated fibers such as rayon, or a mixture of natural fibers and regenerated fibers, or the like. As natural fibers other than pulp, for example, kenaf, bamboo fiber, straw, cotton, cocoon silk, sugar cane, etc. can be used. The liquid-permeable pulp fiber accumulation layer 2 is preferably formed in a manner in which the density of fibers in the thickness direction is different. Here, the pulverized pulp 5 means that a pulp material that becomes a raw material of a paper material or the like is finely pulverized by a pulverizer or the like to become cotton-like. As the raw material of the pulverized pulp 5, wood pulp, synthetic pulp, waste paper pulp, etc. can be cited, and toilet paper materials may also be used. As the toilet paper material, those prepared with bleached kraft pulp of conifers and bleached kraft pulp of hardwoods can be used, but from the viewpoint of manufacturing, it is preferable to use raw material pulp composed of bleached kraft pulp of conifers. Since the bleached kraft pulp of coniferous trees has a longer fiber length compared with the bleached kraft pulp of broad-leaved trees, if you use coniferous The pulverized pulp 5 obtained by bleaching kraft pulp constitutes the liquid-permeable pulp fiber accumulation layer 2, and the intertwined state of the fibers is improved, and as a result, the strength is improved. In addition, the inter-fiber space volume created by the entanglement of fibers is larger than in the case of using hardwood bleached kraft pulp with a shorter fiber length, and the freedom of movement of each fiber increases, so the flexibility is also improved.

When the above-mentioned raw fiber is a material using crushed pulp 5 as the main raw material, the blending ratio of crushed pulp 5 is preferably 30% or more, more preferably 50% or more. More preferably, the blending ratio of the crushed pulp 5 is preferably 80% or more, and more preferably 100% is formed from the crushed pulp 5. The crushed pulp 5 is formed by crushing the pulp material to form a cotton-like shape. Therefore, compared with paper made from paper in which the fibers are in a compressed state, there are countless spaces between the fibers. If countless spaces are formed between the fibers, the freedom of movement of each fiber constituting the liquid-permeable pulp fiber accumulation layer 2 can be increased. Therefore, by setting the blending of the pulverized pulp 5 to the above ratio, even if it is a smaller basis weight, the bulkiness forming function of the liquid-permeable pulp fiber accumulation layer 2 can be increased. As a result, the overall flexibility can be improved, and the production efficiency during manufacturing can be improved.

In addition, the basis weight of the liquid-permeable pulp fiber accumulation layer 2 is preferably 80 g/m ² or less, and more preferably 60 g/m ² or less. By setting the weight per unit area of the liquid-permeable pulp fiber accumulation layer 2 within the above range, the pulp fiber accumulation sheet 1 can be easily manufactured and packaged, and it can be configured to have bulkiness that is easy for the user to use and easy to package. . In addition, by setting the above-mentioned basis weight to the above-mentioned range, the fiber density does not become too large. As a result, it is possible to reduce the amount of adhesive used to join the fibers. Therefore, it is also possible to prevent a large amount of adhesive from adhering to the surface of the liquid-permeable pulp fiber accumulation layer 2. The adhered adhesive is filmed to reduce the liquid permeability of the liquid-permeable pulp fiber accumulation layer 2, thereby ensuring the pulp fiber The overall water absorption of the stacking sheet 1.

As the above-mentioned adhesive, various adhesives can be used. Examples of the binder that can be used in the present invention include polysaccharide derivatives, natural polysaccharides, and synthetic polymers. Examples of polysaccharide derivatives include carboxymethyl cellulose (CMC), carboxyethyl cellulose, carboxymethylated starch or a salt thereof, starch, methyl cellulose, ethyl cellulose, and the like. Examples of natural polysaccharides include guar gum, trento gum, trixian gum, sodium alginate, carrageenan, gum arabic, gelatin, casein, and the like. In addition, as synthetic polymers, polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer resin (EVA), polyvinyl alcohol derivatives, polymers or copolymers of unsaturated carboxylic acids, or salts thereof, etc. can be cited. Unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic anhydride, maleic acid, and fumaric acid. Among the above, carboxymethyl cellulose and polyvinyl alcohol are particularly preferred.

If the above-mentioned binder is cross-linked, the physical strength of the pulp fiber accumulation sheet 1 is improved, which is preferable. The cross-linking agent that cross-links the adhesive has a cross-linking reaction with the adhesive to make the adhesive a cross-linked structure, thereby increasing the physical strength. In the case of using a binder having a carboxyl group such as carboxymethyl cellulose, it is preferable to use a polyvalent metal ion as a crosslinking agent. As the polyvalent metal ion, alkaline earth metals such as zinc, calcium, or barium can be cited ; Magnesium, aluminum, manganese, iron, cobalt, nickel, copper and other metal ions. Among them, zinc, calcium, barium, magnesium, aluminum, iron, cobalt, nickel, and copper ions can be preferably used. These are better in terms of imparting sufficient wet strength. The above-mentioned polyvalent metal ions as crosslinking agents are used in the form of water-soluble metal salts such as sulfates, chlorides, hydroxides, carbonates, and nitrates. In addition, when polyvinyl alcohol is used as a water-soluble binder, as a crosslinking agent, titanium compounds, boron compounds, zirconium compounds, silicon-containing compounds, etc. can be used, and one of these compounds or a combination of A variety of mixtures are used as crosslinking agent. Examples of the titanium compound include titanium lactate and titanium triethanolamine. Examples of the boron compound include borax and boric acid. Also, as the zirconium compound, for example, zirconium ammonium carbonate, etc. can be cited, and as the silicon-containing compound, for example, For example, sodium silicate can be cited.

The content of the binder in the pulp fiber accumulation sheet 1 relative to the liquid-permeable pulp fiber accumulation layer 2 is preferably 1 to 20% by weight. If the content is less than 1% by weight, the strength of the pulp fiber accumulation sheet 1 is insufficient. On the other hand, if it exceeds 20% by weight, the flexibility of the pulp fiber accumulation sheet 1 is reduced.

The liquid-permeable pulp fiber accumulation layer 2 constituting the pulp fiber accumulation sheet 1 is provided with a plurality of fiber crimping portions 2a, 2a... formed by compression and pressing, and the fiber crimping portions adjacent to each other are present The method of crushing the pulp fibers 2b of 2a and 2a forms the fiber crimping part 2a, so that the shape of the pulp fiber accumulation sheet 1 can be stably maintained, and the pulp fiber accumulation sheet 1 has appropriate strength and, on the other hand, moderate flexibility. . If the above-mentioned binder is a water-soluble binder such as carboxymethyl cellulose, the pulp fiber accumulation sheet 1 becomes a water-decomposable pulp fiber accumulation sheet having good water-degradability. In addition, when the above-mentioned binder is made of polyvinyl alcohol, it can be a water-decomposable pulp fiber accumulation sheet having good hydrolyzability according to conditions, or it can be a non-hydrolyzable pulp fiber accumulation sheet. In addition, in the present invention, hydrolysis means that the adhesive force between the fibers constituting the paper has the minimum strength required for its forming and wiping functions in a dry state, such as being thrown into water. When it is immersed in water significantly, its adhesive force is extremely reduced. If any external force is applied, it will easily decompose or disperse. Furthermore, in the present invention, non-hydrolyzable means that the adhesive force between the fibers constituting the paper has the minimum strength required for its forming and wiping functions in a dry state, even when it is significantly immersed in water wet In the state, no matter what external force is applied, it will not easily disperse and so on.

That is, the pulp fiber accumulation sheet 1 is manufactured without a papermaking step, and even if it is not formed as a laminate with a sheet obtained by papermaking, it can maintain its shape and have appropriate strength.

Fig. 1 and Fig. 2 show the schematic structure of the pulp fiber accumulation sheet 1. The pulp fiber accumulation sheet 1 is provided with the above-mentioned fiber crimping portion 2a having a plurality of fine concave shapes in a scattered dot pattern. The distance between the adjacent fiber crimping portions 2a and the fiber length of the crimped pulp fiber 2b are adjusted so that there are pulverized pulp fibers 2b that span the adjacent fiber crimping portions 2a and 2a. The pulverized pulp fibers 2b may span the above-mentioned fiber crimping portion 2a at three or more locations. The compression and pressing part is preferably formed by embossing. The above-mentioned fiber crimping portion 2a is sufficient as long as it is provided in plural, and its form can be appropriately changed as necessary. In the example shown in FIG. 3, regarding the fiber crimping portion 2a, in the pulp fiber accumulation sheet 1, the fiber crimping portion 2a having a concave shape is linear.

If the pulp fiber accumulation sheet 1 is impregnated with a cleaning liquid to become a moist state, it becomes a sheet material that can be used for body wiping of infants and young children, toilet paper, or other cleaning sheets.

Then, the above-mentioned manufacturing method has the following steps: a fiber accumulation step in which raw fibers composed of pulverized pulp 5 or mainly pulverized pulp 5 are deposited on a mesh body by suction to form a fiber accumulation body; crimping and pressing steps , By compressing and pressing, the obtained fiber accumulation body will form a plurality of fiber crimping parts 2a in the fiber accumulation body in a way that there are pulverized pulp fibers 2b spanning the adjacent fiber crimping part 2a; The agent coating step is to apply a binder to at least one surface of the fiber accumulation body; and the drying step is to dry the fiber accumulation body after the binder coating step to become a liquid-permeable pulp fiber accumulation layer 2.

Figure 4 shows the outline of the manufacturing method. In the figure, symbol 3 is the original sheet of the pulp material used as the raw material fiber, and symbol 4 in the figure is the winding body of the produced pulp fiber accumulation sheet 1.

(1) The above-mentioned pulp material is first sent to the pulverizing device 6 to become pulverized pulp 5. The symbol 6a is a fixed knife constituting the pulverizing device 6, and the symbol 6b is a rotating knife constituting the pulverizing device 6.

(2) The pulverized pulp 5 is finally converted into a fiber accumulation body which becomes the pulp fiber accumulation sheet 1 in the fiber accumulation device 7. The fiber stacking device 7 is constructed as follows: by setting the inner side of the conveyor belt 7a to negative pressure, the crushed pulp 5 is adsorbed to the mesh-shaped conveyor belt 7a that receives the crushed pulp 5 as the mesh body. Upper surface.

(3) In this embodiment, before the pressure bonding and pressing steps, the fiber accumulation body is further pressed by the flat roller 8. In the example shown in the figure, above the unloading end 7b of the conveyor belt 7a constituting the fiber accumulation device 7, a flat roller 8 for sandwiching the fiber accumulation body between the unloading end 7b and the unloading end 7b is arranged. Thereby, in the present embodiment, the fiber accumulation body is fed in a sheet-like state that is unlikely to adhere to the embossing roll 9 described below in the crimping and pressing steps.

(4) In the present embodiment, the step of crimping and pressing the fiber accumulation body is an embossing process using an embossing roller. In the example shown in the figure, the above-mentioned fiber accumulation body is fed between the upper and lower pair of embossing rollers 9, 9 so that there are pulverized pulp fibers 2b spanning the adjacent fiber crimping portions 2a, 2a. , A plurality of fiber crimping parts 2a are formed in the liquid-permeable pulp fiber accumulation layer 2. As the embossing roller, a conventionally known one in which a plurality of protrusions for embossing are projected on the peripheral surface of the roller can be used. At this time, the liquid-permeable pulp fiber accumulation layer 2 is in a non-wetting state, and the embossing process is performed on the fiber accumulation layer in a non-wetting state. Here, the non-wet state means a state in which water is not included in blowing water to the liquid-permeable pulp fiber accumulation layer 2 and water is supplied to the liquid-permeable pulp fiber accumulation layer 2. Generally, paper materials contain moisture (moisture) corresponding to temperature and humidity conditions, However, since this moisture (moisture) is not moisture actively supplied from the outside, even if such moisture (moisture) is contained, it is equivalent to a non-humid state. Therefore, although the content rate of moisture (moisture) contained in the fiber accumulation layer also changes according to temperature and humidity conditions, no matter what the content rate is, it can be said to be equivalent to a non-wetting state.

(5) Regarding the above-mentioned fiber accumulation body after the above-mentioned crimping and pressing steps, in the example shown in the figure, the fiber accumulation body is stacked (placed) on the upper surface and transported on the conveyor 10, and the After the binder is supplied to one side of the fiber accumulation, the other side of the fiber accumulation is supplied with the binder from the side of the conveyor 11 that conveys the fiber accumulation longitudinally to coat both sides of the fiber accumulation Cloth adhesive. There are also cases where the adhesive is applied to only one side of the fiber accumulation body. The supply of the adhesive is typically performed by spraying a solution of the adhesive from the nozzle 12 of the spray device. The spray nozzle 12 used for spraying can be arbitrarily selected from conventionally known ones. The above-mentioned supply of the adhesive is not limited to spraying, and other known methods such as coating using a roll-shaped coating device such as a gravure printing machine or a flexographic printing machine may also be used. The crosslinking agent can be supplied at the same time as the binder, but the crosslinking agent is not limited to the case where it is supplied together with the binder, and can be supplied and added at any time in the manufacturing process.

(6) The fiber accumulation body coated with the binder is sent to the drying device 13 for drying. The drying is preferably performed by electromagnetic wave drying. The reason is that if the fiber accumulation body formed with the plurality of fiber crimping portions 2a by the crimping and pressing steps is coated with a binder, it takes time to dry, then the fiber crimping portion 2a The shape is easy to lose. In addition, for this drying, a conventionally known method such as hot air drying or infrared drying can be selected arbitrarily. In addition, the drying is not limited to the case of drying by one drying device, and a plurality of drying devices may be installed to sequentially send the liquid-permeable pulp fiber accumulation layer 2 to each drying device. While drying.

In this embodiment, instead of applying a binder to the above-mentioned fiber accumulation body and drying it, and then performing embossing, it is the case that the binder is applied after the embossing, and then drying is performed. If the adhesive is applied before the embossing process, it will cause a lot of damage to the fibers constituting the fiber accumulation body during the embossing process, and also cause a lot of damage to the surface layer of the adhesive formed on the surface of the fiber accumulation body. Damage, as a result, in this embodiment, there is an advantage that such damage does not occur to the fiber accumulation or even the cleaning sheet 1 produced therefrom.

(7) In this embodiment, after the drying, the two edges of the fiber accumulation body along the conveying direction are cut linearly along the conveying direction, and the pulp produced from the fiber accumulation body is sorted. The shape of the fiber accumulation sheet 1. In the example shown in the figure, the above-mentioned cutting is performed by feeding the above-mentioned fiber accumulation body between a pair of upper and lower cutting rollers 14 and 14.

(8) Folding the pulp fiber accumulation sheet 1 produced in the above manner as necessary. In addition, by impregnating the pulp fiber accumulation sheet 1 produced in the above manner with a medicinal solution, it can be used for wiping off the body of infants and young children, or cleaning toilet paper or other cleaning articles.

Next, using FIGS. 5-7, the manufacturing method of the pulp fiber accumulation sheet 101 by the air-laid method of 2nd Embodiment is demonstrated. Here, in the second embodiment, the raw material (material) of the pulp fiber accumulation sheet 101, the weight per unit area, the applicable binder and crosslinking agent, the drying method, etc., can be appropriately applied to the above-mentioned embodiment, so the repetition is omitted. The description. In addition, in FIG. 5, in order to avoid the complication of the drawing, for the pulp fiber accumulation sheet 101, only the final part of the production line 100 is marked with a symbol, and the illustration of the other parts will be omitted. Similarly, the illustration of the pulp fiber 103 is also omitted.

Figure 5 shows the production line of the pulp fiber accumulation sheet 101 of the second embodiment A diagram of a schematic diagram of 100. The manufacturing steps of the production line 100 are roughly divided into a step before pulverization, a pulverization step, a fiber accumulation step, a pressing step, a binder coating step, and a drying step.

The pre-pulverization step includes a liquid supply step and a pulp detection step. The liquid supply step is a step of supplying liquid to the pulp fiber 103 by the liquid supply device 104. In addition, the pulp detection step is a step in which the pulp detection device 105 detects whether the pulp fiber 103 is being supplied to the production line 100. In addition, the width of the pulp fiber 103 (the length in the y direction) is about 900 mm to 1800 mm, and the production line 100 is designed and manufactured according to the width.

Figure 6 is a schematic diagram of the liquid supply step and the pulp detection step. As shown in FIG. 6, in the liquid supply step, the liquid supply device 104 supplies liquid to the central area 104a of the conveyed pulp fiber 103. As described below, the pulp fiber 103 is likely to have static electricity caused by the accumulation of the fibers on the net and the conveyance. In addition, there are cases in which the pulp fiber accumulation sheet 101 manufactured by the production line 100 is used as an absorber for absorbing excrement. Therefore, as the liquid supplied by the liquid supply device 104, a solution such as ethanol, methanol, 2-propanol (IPA), or water can be used for antistatic purposes. In addition, as the liquid supplied by the liquid supply device 104 for deodorization of excrement, it can be used: activated carbon; zeolite; silica; ceramic; Otani stone; charcoal polymer; carbon nanotube; carbon nanohorn; lemon Acid, succinic acid and other organic acids, alum (potassium aluminum sulfate).

In addition, in FIG. 5, although the liquid supply device 104 is illustrated as a single unit, it is also possible to install a plurality of them in accordance with applications such as antistatic use or deodorizing use. In addition, instead of making the central area 104a a liquid supply area, an area shifted in the Y direction in FIG. 5 may be made a liquid supply area. In this embodiment, the entire Y direction of the pulp fiber 103 is not set as the liquid supply area, but a partial area such as the central area 104a is set as the liquid supply area. The reason is that since the pulp fiber 103 is pulverized in the following pulverization step to be cotton-like, it is The pulverized and pulverized pulp fiber 103 is supplied to the above-mentioned liquid substantially as a whole. Thereby, excessive liquid supply by the liquid supply device 104 can be prevented, and the manufacturing cost of the pulp fiber accumulation sheet 101 can be suppressed. As an example, the length in the Y direction of the central region 104a is set to be about 10% to 50% of the width of the pulp fiber 103. The length in the X direction can be the same as the length in the Y direction, or shorter than the length in the Y direction (25%~ Around 75%). In addition, in FIG. 6, the central area 104a is rectangular, but it may be circular or elliptical.

In addition, the liquid supply device 104 can adjust the supply amount of the antistatic liquid according to the humidity of the production line 100. Specifically, the liquid supply device 104 is used when the room where the production line 100 is installed is dry (for example, when the humidity is below 50%), and when the room where the production line 100 is installed is not dry (for example, when the humidity is above 65%). In case of situation) Compared with that, it is enough to increase the supply amount of antistatic liquid. That is, the liquid supply device 104 only needs to increase the supply amount of the antistatic liquid according to the decrease in humidity.

Similarly, the liquid supply device 104 only needs to change the supply amount of the deodorizing liquid according to the purpose of the pulp fiber accumulation sheet 101. Specifically, the liquid supply device 104 only needs to increase the supply amount of the deodorizing liquid in the above-mentioned absorbent body, and reduce the supply amount of the deodorizing liquid when it is used in an exterior body. In addition, the liquid for deodorization sometimes uses a liquid in which metal is dissolved. Therefore, the liquid supply device 104 stops the supply of the deodorizing liquid when the pulp fiber accumulation sheet 101 becomes a skin contact surface (when it is in contact with the skin).

Another step of the pre-shredding step is a pulp detection step that detects whether the pulp fiber 103 is being conveyed. This is to detect the state where the roll-shaped pulp fibers 103 are all conveyed, and the pulp fibers 103 are not conveyed. The pulp detection device 105 irradiates the detection light 105a downward, and when the reflected light from the pulp fiber 103 is detected by the detection unit (not shown), it detects that the pulp fiber is positive. Was transported. The pulp detection device 105 is set to assume that pulp fibers have not been detected when the above-mentioned reflected light cannot be detected by a detection unit (not shown), and give a warning by sound or light.

In the production line 100, following the pre-crushing step, the pulverizing device 106 is used to pulverize the pulp fiber 103 in the pulverizing step. The pulverizing device 106 has a primary pulverizing part and a secondary pulverizing part. The pulp fiber 103 is pulverized into small pieces by the primary pulverizing part, and the pulp fiber 103 pulverized into small pieces is pulverized into a cotton shape by the secondary pulverizing part. In addition, in the pulverization step, in order to prevent the pulverized pulp fibers 103 from being scattered, both the primary pulverization part and the secondary pulverization part are housed in a casing or the like. In addition, in the second embodiment of the present invention, it is preferable to make the pulverized pulp 100%, but it is also possible to mix composite fibers (ES fibers). In addition, it may be crushed into a cotton shape by the primary crushing part, and in this case, the secondary crushing part may be omitted.

On the production line 100, following the pulverizing step, in the fiber stacking step, the fiber stacking device 107 is used to stack the cotton-like pulp fibers 103. The cotton-like pulp fiber 103 is accumulated in the three tanks 107a, 107b, and 107c through the pipe 108 by high-pressure air or the like. In addition, the number of grooves is not limited to three. In addition, in the fiber accumulation step, in order to prevent the cotton-like pulp fiber 103 from being scattered (spreading), a scatter prevention protective cover is provided. In this way, the inhalation of the pulp fiber 103 by the workers of the production line 100 is reduced. In addition, in this second embodiment, the average fiber length of the pulverized pulp fiber 103 is set to be about 1 mm to 3 mm as an example.

The cotton-like pulp fibers 103 accumulated in the three tanks 107a, 107b, and 107c are accumulated on the lower conveying net 109. The lower conveyance net 109 has a mesh shape, and as its material, a polymer compound can be used, and synthetic resins (thermoplastic resins) such as polytetrafluoroethylene or synthetic fibers such as nylon and PET can be used. As the lower side transport net 109, it can be used for 1 inch × 1 inch There are 30 to 50 counts of 30-50 meshes. In the second embodiment, it is set to 40 (for example, 0.5mm×0.5mm) nets, but it is not limited to this.

The lower conveying net 109 conveys the cotton-like pulp fibers 103 where the fibers are piled up in the X direction in the figure by driving force from a driving source not shown. In addition, the lower conveying net 109 repeatedly conveys the cotton-like pulp fibers 103 in a predetermined driving range (from the fiber accumulation step to the pressing step by the flat roller 112) by the four rollers 110.

A vacuum device 111 is arranged below the lower conveying net 109. The vacuum device 111 sucks the cotton-like pulp fiber 103 through the net-like conveying net 109.

FIG. 7 is a schematic diagram showing the cotton-like pulp fiber 103 with fiber accumulation. As shown in Figure 7(a), the cotton-like pulp fibers 103 from the tank 107a where the fibers accumulate to the conveying net 109 increase (increases) on the right side where the fiber accumulation time is longer. As they move to the left, the fibers accumulate due to The time becomes shorter, so it becomes less (lower). However, as the amount of fiber accumulation increases, the suction force of the vacuum device 111 becomes weaker. Conversely, in the part where the stacking capacity is small, the suction force of the vacuum device 111 is not easily weakened.

Therefore, as shown in FIG. 7(b), the fiber accumulation amount of the cotton-like pulp fiber 103 from the fiber accumulation of the groove 107b to the conveying net 109 has little difference regardless of the position of the conveying net 109. And, as shown in FIG. 7(c), the fiber accumulation amount of the cotton-like pulp fibers 103 from the tank 107c fiber accumulation to the transport net 109 becomes substantially uniform regardless of the position of the transport net 109. In this way, by utilizing the change of the suction force of the vacuum device 111, the pile-up amount of the cotton-like pulp fibers 103 that are deposited on the conveying net 109 can be made substantially uniform. In addition, when the stacking amount of cotton-like pulp fiber 103 is uneven due to different parts, just move the position of the vacuum suction port not shown or change the number of the vacuum suction port to adjust. .

In addition, directly above the conveying net 109, it is closer to the vacuum device 111 and has a stronger adsorption force. Therefore, the cotton-like pulp fibers 103 are densely packed. On the other hand, as they move away from the conveying net 109 ( As it moves away from the +Z direction), the suction force of the vacuum device 111 becomes weaker, and the cotton-like pulp fiber 103 becomes sparse. When the pulp fiber accumulation sheet 101 manufactured by the production line 100 is made into a product, if it is a cleaning product such as a floor sheet or toilet paper, the chemical solution is applied to the denser surface of the cotton-like pulp fiber 103 , Can reliably remove stains. On the other hand, if it is a product used for skin such as a body sheet or a face sheet, by applying a medicinal solution to the relatively sparse surface of the cotton-like pulp fiber 103, it is possible to provide skin with a better skin feel. Used products.

In the production line 100, following the fiber accumulation step, in the pressing step, a plurality of pressing devices are used to press the stacked cotton-like pulp fibers 103. In the second embodiment, the pressing step has: a first pressing step, pressing until the following first adhesive application step; and a second pressing step, pressing until the following first drying and second Adhesive coating step. The flat roller 112 has a pair of roller members, which presses the cotton-like pulp fiber 103 accumulated by the fiber to adjust its bulkiness. In this second embodiment, a pressure of 4 Kgf/cm ^{2 is} applied to the flat roller 112. Thereby, on the lower surface of the pulp fiber 103 (the surface in contact with the lower conveying net 109), the net-shaped concavities and convexities of the lower conveying net 109 are formed. The pressure of the flat roller 112 ^{can be set between 2Kgf/cm 2} ~ 8Kgf/cm ² , and the pressure can be set according to the purpose of the product using the pulp fiber accumulation sheet 101, whether it is a hydrolyzable product or a non-hydrolyzable product.

As described above, the lower conveying net 109 has 40 nets (for example, 0.5 mm×0.5 mm), and the irregularities of the net shape are formed at intervals of 0.5 mm. In contrast, the average fiber length of the pulverized pulp fiber 103 is about 1 mm to 3 mm, so the pulverized pulp fiber 103 spans the unevenness of the net shape.

When in the case of pulp fibers do not want to 103 mesh residue of shape, as long as the pressure level of the roller 112 is set to less than 2Kgf / cm ² can, if the lower pressure resistance with the transport network 109 is also applied 8Kgf / The pressure of cm ² or more forms a net shape on the pulp fiber 103. In addition, a liquid supply device 104 may be installed before and after the flat roller 112 to supply liquid for at least one of antistatic and deodorizing. In addition, at least one of the pair of roller members constituting the flat roller 112 may be embossed in a concave-convex shape.

In the second embodiment, the lower conveying net 109 conveys the pulp fiber 103 to the pressing step of the flat roller 112. Prior to the pressing step of the flat roller 116, the pulp fiber 103 is conveyed by the upper conveying net 113 and the vacuum device 115. Specifically, the vacuum device 115 installed on the upper side of the conveying surface of the upper conveying net 113, by contacting the upper surface of the pulp fiber 103 with the upper conveying net 113, vacuum sucks the pulp fiber 103 pressed by the flat roller 112 surface. In this state, the pulp fiber 103 is conveyed in the X direction in the figure by the driving force from a driving source not shown. In addition, the transport net 113 repeatedly transports the pulp fiber 103 within a predetermined driving range (the pressing step of the flat roller 116) by the four rollers 114.

The flat roller 116 has a pair of roller members and presses the pulp fiber 103 passing through the flat roller 112 to adjust its bulkiness, or forms the shape of the upper conveying net 113 on the upper surface of the pulp fiber 103 (and the upper conveying net 113 Contact surface). The upper conveying net 113 is also a 40-piece net similarly to the lower conveying net 109. In addition, the pressure of the flat roller 116 is also set between 2Kgf/cm ² and 8Kgf/cm ² . By using the flat roller 112 and the flat roller 116 to press multiple times, the pulp fiber 103 can be softened.

The embossing roller 117 cooperates with the roller on the lower side of the flat roller 116 to emboss the pulp fiber 103 passing through the flat roller 116. In the second embodiment, although it is set as a corrugated embossing roller, Its shape can be any shape. In addition, a plurality of embossing rollers 117 may also be provided to perform multiple embossing processes. In this case, it can be embossing rolls of the same shape or embossing rolls of different shapes. In addition, in the second embodiment, the pressure of the embossing roller 117 is set at a higher pressure than the pressure set by the flat rollers 112 and 116, for example, it is set between 4Kgf/cm ² and 10Kgf/cm ² . In addition, the number of times for embossing can be set according to the purpose of the product using the pulp fiber accumulation sheet 101, whether it is a hydrolyzable product or a non-hydrolyzable product, or not. When embossing is not performed, the distance between the pair of roller members may be greater than the thickness of the pulp fiber accumulation sheet 101 in the Z direction. In addition, it can be seen from FIG. 5 that the pulp fiber 103 does not exist in the conveying net during the embossing process. This is to avoid damage to the conveying net due to embossing. Instead of cooperating with the roll below the flat roll 116, the pulp fiber 103 can be embossed by cooperating with the below-mentioned lower conveying wire 118 and the embossing roller 117. In this case, it is only necessary to shift the position of the embossing roller 117 in the positive X direction in FIG. 5 so that the embossing roller 117 and the lower conveying net 118 face each other. In addition, instead of the embossing roller 117, the pulp fiber 103 may be pressed by the flat roller and the lower conveying net 118.

In addition, in the second embodiment, the liquid is supplied to the pulp fiber 103 by the liquid supply device 104, but in the second embodiment, as long as the pulp fiber 103 is not wet until the pressing step, for example, As long as the moisture content of the pulp fiber 103 is less than 15% during the pressing step, it is only necessary that the moisture content of the pulp fiber 103 is not affected by static electricity during the transportation by the net. Therefore, in the second embodiment, if the moisture content of the pulp fiber 103 does not reach about 15% during the pressing step, it can be said to be equivalent to a non-wetting state.

In the first pressing step, the flat rolls 112, 116 and the embossing roll 117 are heated in the range of about 60°C to 150°C, so that the temperature of the pulp fiber 103 becomes 40°C to 70°C In the following adhesive step, the adhesive can easily penetrate into the pulp fiber 103, so that the coating amount of the adhesive can be reduced, and the manufacturing cost can be reduced. In addition, it is also possible to heat the flat rolls 112 and 116 and the embossing roll 117 by making the temperature of the pulp fiber 103 the same temperature as the melting temperature of the binder (for example, 40°C to 60°C).

In the production line 100, after the pressing step, the pulp fiber 103 is coated with a binder in the binder coating step to form the liquid-permeable pulp fiber accumulation layer described in the above embodiment. In the second embodiment, the adhesive application step has a first adhesive application step and a second adhesive application step, and there is a following between the first adhesive application step and the second adhesive application step. The first drying step described. Here, the first adhesive application step will be described.

In the first adhesive coating step, the adhesive is applied to the upper surface of the pulp fiber 103 by the first coating device 121, which is arranged above the pulp fiber 103 and has an opposite direction to the pulp fiber 103.之 Multiple nozzles. The pulp fiber 103 is placed on the lower conveying net 118 of the net shape, and is conveyed in the X direction while being sucked in the -Z direction by the vacuum device 120 provided under the lower conveying net 118. The net of the lower conveying net 118 can be a thicker net than the lower conveying net 109 and the upper conveying net 113. 10 to 30 nets can be used. In the second embodiment, it is set to 16 Support (for example, 1.0mm×1.0mm) net. In addition, the lower conveying net 118 repeatedly conveys the pulp fibers 103 within a predetermined driving range (first adhesive application step) by four rollers 119.

That is, in the first adhesive coating step, the upper surface of the pulp fiber 103 is coated with the adhesive from the upper side (+Z direction) to the lower side (-Z direction) by the first coating device 121, and the adhesive is applied by vacuum The device 120 adsorbs the lower surface of the pulp fiber 103 toward the lower side (-Z direction).

As an adhesive applied (sprayed) to the upper surface of the pulp fiber 103, Used in any of the adhesives mentioned in the above embodiment, in this second embodiment, it is assumed that CMC is applied to the pulp fiber 103 used in the hydrolyzable product, and the pulp fiber used in the non-hydrolyzable product In the case of 103, EVA is used. In addition, as described above, on the upper surface side of the pulp fiber 103, the cotton-like pulp fiber 103 is sparser than the lower surface side of the pulp fiber 103, and therefore the adhesive is easily permeated. Therefore, the possibility that the adhesive applied (sprayed) to the upper surface of the pulp fiber 103 remains on the upper surface of the pulp fiber 103 can be reduced.

On the production line 100, following the first adhesive coating step, a first drying step, which is one of the drying steps, is performed. In the first drying step, by the first drying device 124, the pulp fiber 103 placed on the conveying net 122 under the net shape is dried by electromagnetic waves from the upper surface side of the pulp fiber 103 as shown by the arrow. . In addition, as the first drying device 124, hot air drying or infrared drying mentioned in the above-mentioned embodiment can be used. In addition, the lower conveying net 122 is in a state where the pulp fiber 103 is sucked by the vacuum device 125 located below the conveying surface of the lower conveying net 122, and the pulp fiber 103 is absorbed by four rollers 123 (only two of them are shown in the figure). The pulp fiber 103 is repeatedly conveyed within a predetermined driving range (first drying step). The lower conveyance net 122 can be used from 10 to 30. In the second embodiment, it is a net of 22 (for example, 0.7mm×0.7mm).

After embossing by the embossing roller 117, the first adhesive coating step and the first drying step are performed, thereby making it easy to maintain the embossed shape formed on the pulp fiber 103.

On the production line 100, after the first drying step, the second pressing step is performed. The second pressing step is performed by the embossing roller 126. The embossing roller 126 has a pair of roller members, and is a corrugated embossing roller like the embossing roller 117, but its shape may be any shape. In addition, a plurality of embossing rollers 126 may also be provided to perform multiple embossing processes. In this case, it can be the same Embossing rollers of different shapes can also be embossing rollers of different shapes. In addition, the pressure of the embossing roller 126 can also be set in the same manner as the embossing roller 117. Moreover, it can be seen from FIG. 5 that in the embossing roller 126, the pulp fiber 103 does not exist in the conveying net during the embossing process, but it may be stored in the conveying net. In addition, the embossing roller 126 may not be provided in the production line 100. In this case, a flat roller may be provided instead of the embossing roller 126. In addition, when the embossing roller 126 is provided, a flat roller can also be used together.

It is more desirable to heat one of the embossing rollers 126 to the embossing roller in the manner described above. In addition, the second pressing process is also performed before the second adhesive application step and the second drying step described below, so it is easy to maintain the embossed shape formed on the pulp fiber 103. In addition, the second pressing process may be omitted, or the embossing roller 126 itself may be omitted, as long as the distance between the pair of roller members is greater than the thickness of the pulp fiber accumulation sheet 101 in the Z direction as described above.

On the production line 100, following the second pressing step, a second adhesive coating step is performed. In the second adhesive coating step, the adhesive is applied to the lower surface of the pulp fiber 103 by the second coating device 130. The second coating device 130 is disposed under the pulp fiber 103 and has an opposite direction to the pulp fiber 103.之 Multiple nozzles. The pulp fiber 103 is conveyed in the X direction while passing through the conveying net 127 on the upper side of the net shape in contact with the pulp fiber 103 and being sucked in the +Z direction by the vacuum device 129. In addition, the upper conveying net 127 repeatedly conveys the pulp fiber 103 within a predetermined driving range (the second adhesive application step) by the four rollers 128. The number of threads of the upper conveying net 127 may be the same as the number of threads of the lower conveying net 118.

That is, in the second adhesive coating step, the lower surface of the pulp fiber 103 is coated with the adhesive from the lower side (-Z direction) to the upper side (+Z direction) by the second coating device 130, and the adhesive is applied by vacuum The device 129 sucks the upper surface of the pulp fiber 103 upward (+Z direction).

The adhesive applied in the second adhesive coating step is the same as the first adhesive The adhesive applied in the coating step is the same. In the second adhesive coating step, the lower surface of the pulp fiber 103 is coated with the adhesive from a plurality of nozzles located below the pulp fiber 103, so the adhesive that has not penetrated into the pulp fiber 103 will fall without remaining Because of the pulp fiber 103, there will be no uneven application of the adhesive. Therefore, it is possible to reduce uneven strength or uneven drying of the pulp fiber accumulation sheet 101 after the second drying step described below.

In addition, in the first and second adhesive coating steps, the pulp fiber 103 is not reversed, but the upper surface and the lower surface of the pulp fiber 103 are coated with the adhesive. Therefore, the complexity of the production line 100 can be avoided, and the conveying speed of the pulp fiber 103 can be increased.

In the first and second adhesive coating steps, a protective cover that prevents the diffusion of the adhesive is installed to form a closed space, and the adhesive that has not been applied to the pulp fiber 103 is recovered by a pump or the like, and then supplied to the second The first coating device 121 and the second coating device 130 can reduce the amount of binder used, and can reduce the manufacturing cost of the pulp fiber accumulation sheet 101.

On the production line 100, following the second adhesive coating step, a second drying step, which is another drying step, is performed. In the second drying step, the pulp fiber 103 passes through the net 131 on the upper side of the net-like shape contacting the upper surface of the pulp fiber 103 by the vacuum device 132 arranged above the conveying surface of the upper conveying net 131 With suction in the +Z direction, it is transported in the X direction. In the second drying step, the second drying device 133 performs electromagnetic wave drying from the lower surface side of the pulp fiber 103 as shown by the arrow. In addition, the hot air drying or infrared drying mentioned in the above embodiment can also be used.

In addition, the upper conveying net 131 is in the state where the pulp fiber 103 is adsorbed by the vacuum device 132 as described above, and is driven within a predetermined driving range by four rollers 134 (only two are shown in the figure) (the second drying step) The pulp fiber 103 is repeatedly conveyed inside. Upper transport net 131 The number of branches may be the same as the number of the lower conveying net 122.

In addition, embossing may be performed after the second drying step.

On the production line 100, the pulp fiber accumulation sheet 101 passes through the second drying step. The pulp fiber accumulation sheet 101 is conveyed by the conveying roller 135 and wound by the two winding rollers 136 and 137.

As described above, also in the second embodiment, the pulp fiber accumulation sheet 101 is manufactured without going through the papermaking step. In addition, it is also possible to set the pulverization step based on the counts of the lower conveying net 109 and the upper conveying net 113 so as to span the average fiber length like a mesh.

In addition, of course, the present invention is not limited to the embodiments described above, and includes all embodiments that can achieve the purpose of the invention.

1‧‧‧Pulp fiber stacking sheet

2‧‧‧Liquid-permeable pulp fiber accumulation layer

2a‧‧‧Fiber crimping part

Claims (20)

A pulp fiber accumulation sheet, characterized in that it has a liquid-permeable pulp fiber accumulation layer containing pulverized pulp or raw material fibers mainly composed of pulverized pulp, and a binder, and is provided with a plurality of fiber presses formed by compression and pressing. And forming the fiber crimping portion in such a way that there are pulverized pulp fibers that span the adjacent fiber crimping portion. For example, the pulp fiber accumulation sheet of item 1 of the scope of patent application, wherein the content of the binder relative to the liquid-permeable pulp fiber accumulation layer is 1-20% by weight. For example, the pulp fiber accumulation sheet of item 1 or 2 of the scope of patent application, wherein the binder is carboxymethyl cellulose. For example, the pulp fiber accumulation sheet of item 1 or 2 in the scope of patent application, wherein the binder is polyvinyl alcohol. For example, the pulp fiber accumulation sheet of item 1 or 2 of the scope of patent application is further impregnated with cleaning liquid and is in a wet state. For example, the pulp fiber accumulation sheet of item 1 or 2 of the scope of patent application contains the binder in a cross-linked state. For example, the pulp fiber accumulation sheet of item 1 or 2 of the scope of patent application, wherein the compression and pressing part is formed by embossing. A method for manufacturing a pulp fiber accumulation sheet, which is characterized in that it has a fiber accumulation step, by means of suction, the raw fiber composed of pulverized pulp or mainly composed of pulverized pulp is accumulated on a mesh body to form a fiber accumulation body; In the pressing step, by compressing and pressing, the obtained fiber accumulation body is formed in the fiber accumulation body in such a way that there are pulverized pulp fibers spanning the adjacent fiber crimping part. A fiber crimping portion; a binder coating step, applying a binder to at least one surface of the fiber stack on which the fiber crimping portion is formed; and a drying step, stacking the fibers after the binder coating step The body dries to become a liquid-permeable pulp fiber accumulation layer. For example, the manufacturing method of the pulp fiber accumulation sheet in the scope of the patent application, wherein the adhesive coating step is to apply the adhesive on both sides of the fiber accumulation body. For example, the manufacturing method of the pulp fiber accumulation sheet of item 8 or 9 of the scope of patent application, wherein the crimping and pressing steps are performed by embossing rollers. For example, the manufacturing method of the pulp fiber accumulation sheet of the 10th patent application, wherein the pressing of the flat roller is further carried out before the pressing and pressing steps are carried out by the embossing roller. For example, the manufacturing method of the pulp fiber accumulation sheet of item 8 or 9 of the scope of patent application, wherein the drying step is performed by electromagnetic wave drying. For example, the manufacturing method of the pulp fiber accumulation sheet of item 8 or 9 in the scope of patent application, wherein the binder is carboxymethyl cellulose. For example, the manufacturing method of the pulp fiber accumulation sheet of item 8 or 9 in the scope of patent application, wherein the binder is polyvinyl alcohol. A method for manufacturing a pulp fiber accumulation sheet, which uses pulverized raw material fibers to produce a fiber accumulation sheet, which is characterized by including the following steps: coating the raw fiber with a binder from a first direction, and adsorbing the raw fiber along the first direction; And apply a binder to the raw fiber from a second direction different from the first direction along the second Direction adsorption of the raw fiber, coating of the binder from the second direction, coating of the binder on the lower surface of the raw fiber, and the step of adsorbing the raw fiber in the second direction, the Adsorption of the upper surface of the raw fiber. For example, the manufacturing method of the pulp fiber accumulation sheet of the 15th patent application includes a conveying step of conveying the raw fiber; the conveying step is to absorb the raw fiber through a contact member contacting the upper surface of the raw fiber Surface and carry it out. For example, the manufacturing method of the pulp fiber accumulation sheet of the 15th patent application includes the following steps: before applying the adhesive from the second direction, supply gas along the first direction. For example, the method for manufacturing a pulp fiber accumulation sheet in the scope of the patent application includes the following steps: after applying the adhesive from the second direction, gas is supplied in the second direction. For example, the method for manufacturing a pulp fiber accumulation sheet of the 15th patent application includes a pressing step, which presses the raw fiber before applying the adhesive from the first direction. For example, the manufacturing method of the pulp fiber accumulation sheet of the 15th patent application includes a static electricity removing step of removing the static electricity of the raw fiber.

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