TW201723273A - Laid pulp sheet and process for producing laid pulp sheet - Google Patents

Abstract

The present invention is a laid pulp sheet. The sheet has a liquid-permeable laid pulp layer comprising a binder and feed fibers that are a pulverized pulp or mainly comprise a pulverized pulp. The sheet is equipped with a plurality of fiber-press-bonded parts formed by compression/pressing, the fiber-press-bonded parts having been formed so that fibers of the pulverized pulp lie across adjacent fiber-press-bonded parts.

Description

Pulp fiber stacking sheet and method for producing pulp fiber stacking sheet

The present invention relates to a pulp fiber deposited sheet which can be used as a sheet for cleaning, and a method for producing the same.

The wet tissue is composed of a first layer composed of a tissue network containing cellulose fibers and a second layer composed of an air laid nonwoven web (see Patent Document 1, Patent Application, and Patent Application No. 11). item).

In Patent Document 1, it is necessary to integrate a first layer (obtained by papermaking) and a second layer (obtained by an airlaid method) having a different method from the method. Further, the first layer imparts strength to the wet tissue, but the flexibility is lowered.

Patent Document 1: US Pat. No. 8275553

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

In order to achieve the above object, in the present invention, the pulp fiber deposited sheet is provided with a raw material fiber containing a pulverized pulp or mainly composed of pulverized pulp, and a binder. The liquid permeable pulp fiber accumulation layer includes a plurality of fiber crimping portions formed by compression and pressing, and the fiber crimping portion is formed in such a manner that the pulverized pulp fibers are present across the adjacent fiber crimping portions .

In one preferred embodiment, the content of the binder relative to the liquid-permeable pulp fiber layer is in the range of 1 to 20% by weight. Further, in one preferred embodiment, the binder is carboxymethylcellulose. Further, in one preferred embodiment, the binder is polyvinyl alcohol. One of the preferred aspects is that the pulp fiber deposited sheet is further impregnated with a cleaning liquid and is in a wet state. Further, one of the preferred aspects is that the binder is contained in a crosslinked state. Further, in a preferred aspect, the compression and pressing portion is formed by embossing.

Moreover, in order to achieve the above-mentioned problem, in the present invention, the method for producing a pulp fiber-laminated sheet is a fiber stacking step in which a raw material fiber composed of pulverized pulp or mainly pulverized pulp is suctioned by suction. Deposited on the mesh body to form a fiber accumulation body; crimping and pressing steps, by compressing and pressing, the obtained fiber accumulation body is in the form of pulverized pulp fibers having cross-over and adjacent fiber crimping portions Forming a plurality of fiber crimping portions on the fiber stack; applying a binder to at least one surface of the fiber stack on which the fiber crimping portion is formed; and drying step of coating the binder After the cloth step, the fiber stack is dried to form a liquid-permeable pulp fiber layer.

In one preferred embodiment, the adhesive application step is a step of applying a binder to both sides of the fiber stack. Moreover, one of the preferred aspects is that the crimping and pressing steps are It is carried out by means of an embossing roll. Further, in a preferred aspect, the flat roller is further pressed before the pressure bonding and pressing steps are performed by the embossing roller. Further, one of the preferred aspects is that the drying step is performed by electromagnetic wave drying. Further, in one preferred embodiment, the binder is carboxymethylcellulose. Further, in one preferred embodiment, the binder is polyvinyl alcohol.

Further, in the production method of claim 15, the fiber deposited sheet is produced by using the pulverized raw material fiber, comprising the steps of: applying a binder to the raw material fiber from the first direction, and adsorbing the raw material fiber in the first direction; The raw material fiber is 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 deposited sheet of the present invention can be produced without a papermaking step, and can maintain its shape even if it is not formed into a laminate of a sheet obtained by papermaking, and has appropriate strength.

2‧‧‧liquid-permeable pulp fiber accumulation layer

2a‧‧‧Fiber crimping department

2b‧‧‧Smashed pulp fiber

5‧‧‧Smashing pulp

106‧‧‧Smashing device

107‧‧‧Fiber accumulation device

117‧‧‧embossing roller

121‧‧‧1st coating device

124‧‧‧1st drying device

130‧‧‧2nd coating device

133‧‧‧2nd drying unit

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective structural view showing a pulp fiber deposited sheet according to an embodiment of the present invention.

Fig. 2 is a cross-sectional structural view showing a main portion of the above-mentioned pulp fiber deposited sheet.

Fig. 3 is a perspective view showing a configuration in which a fiber crimping portion is a linear pulp fiber stack.

Fig. 4 is a view showing the configuration of a schematic display of an example of the manufacturing process of the above-mentioned pulp fiber deposited sheet.

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

Fig. 6 is a schematic view showing a liquid supply step and a pulp detecting step.

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

Hereinafter, a typical embodiment of the present invention will be described based on Figs. 1 to 7 . The pulp fiber deposited sheet 1 of the present embodiment is composed of one or two or more layers of liquid-permeable pulp fiber deposited layers 2, and is typically used as a non-hydrolyzable cleaning sheet for cleaning or a hydrolyzable cleaning for body cleaning. A sheet for hydrolyzable cleaning such as a sheet or toilet paper. Moreover, in the manufacturing method of this embodiment, the above-mentioned pulp fiber deposited sheet 1 can be manufactured reasonably and suitably.

The pulp fiber deposited sheet 1 has a liquid-permeable pulp fiber deposited layer 2 containing a raw material fiber composed of pulverized pulp 5 or mainly pulverized pulp 5, and a binder, and has a plurality of fiber pressures formed by compression and pressing. The fiber crimping portions 2a are formed in the joint portions 2a, 2a, ... so as to have the pulverized pulp fibers 2b which are adjacent to the adjacent fiber crimping portions 2a, 2a.

The liquid permeable pulp fiber deposited layer 2 is composed of an aggregate of a plurality of fibers and has water absorbability. The liquid permeable pulp fiber accumulation layer 2 can be formed by a natural fiber such as pulp or a regenerated fiber such as enamel or a mixture of natural fibers and regenerated fibers. As the natural fiber other than the pulp, for example, kenaf, bamboo fiber, straw, cotton, silk, sugar cane or the like can be used. The liquid permeable pulp fiber buildup layer 2 is preferably configured such that the density of the fibers in the thickness direction is different. Here, the pulverized pulp 5 is obtained by finely pulverizing a pulp material which is a raw material of a paper material or the like by a pulverizer or the like to be cotton. Examples of the raw material of the pulverized pulp 5 include wood pulp, synthetic pulp, waste paper pulp, and the like, and a toilet paper material can also be used. As the toilet paper material, a conifer bleached kraft pulp and a hardwood bleached kraft pulp can be used, but from the viewpoint of production, it is preferred to use a raw material pulp composed of conifer bleached kraft pulp. Since the conifer bleached kraft pulp has a longer fiber length than the broadleaf bleached kraft pulp, if the self-coniferous tree is used When the pulverized pulp 5 obtained by bleaching the kraft pulp constitutes the liquid permeable pulp fiber buildup layer 2, the entangled state of the fibers is improved, and as a result, the strength is improved. Further, the volume of the interfiber space generated by the mutual entanglement of the fibers is larger than that of the broad-leaved bleached kraft pulp having a short fiber length, and the degree of freedom of movement of the fibers is increased, so that the flexibility is also improved.

When the raw material fiber is a material which pulverizes the pulp 5 as a main raw material, the blending ratio of the pulverized pulp 5 is preferably 30% or more, more preferably 50% or more. Further preferably, the blending ratio of the pulverized pulp 5 is preferably 80% or more, more preferably 100% by the pulverized pulp 5. Since the pulverized pulp 5 is formed by pulverizing the pulp material and forming it in a cotton form, there is an infinite number of spaces formed between the fibers as compared with the paper obtained by the paper being compressed. If an infinite number of spaces are formed between the fibers, the degree of freedom in movement of the fibers constituting the liquid permeable pulp fiber deposition layer 2 can be increased. Therefore, by setting the ratio of the pulverized pulp 5 to the above ratio, even if the basis weight is small, the bulkiness forming function of the liquid permeable pulp fiber deposited layer 2 can be increased. As a result, the overall flexibility can be improved and the production efficiency at the time of production can be improved.

Further, the basis weight of the liquid permeable pulp fiber deposited layer 2 is preferably 80 g/m ² or less, and more preferably 60 g/m ² or less. By setting the basis weight of the liquid-permeable pulp fiber-laid layer 2 to the above range, the production and packaging of the pulp fiber-receiving sheet 1 can be easily performed, and the structure can be easily used and the bulkiness of the package can be easily packaged. . Further, by setting the above-mentioned basis weight to the above range, the fiber density is not excessively increased. As a result, the amount of the binder for joining the fibers can be reduced. Therefore, it is also possible to prevent a large amount of the adhesive from adhering to the surface of the liquid-permeable pulp fiber deposited layer 2, and the adhered adhesive film is formed to lower the liquid permeability of the liquid-permeable pulp fiber deposited layer 2, thereby ensuring the pulp fiber. The overall water absorption of the sheet 1 is accumulated.

As the above binder, various binders 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 the polysaccharide derivative include carboxymethylcellulose (CMC), carboxyethylcellulose, carboxymethylated starch or a salt thereof, starch, methylcellulose, ethylcellulose, and the like. Examples of the natural polysaccharides include guar gum, tranplast gum, tristanc gum, sodium alginate, carrageenan, gum arabic, gelatin, casein, and the like. Further, examples of the synthetic polymer include polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer resin (EVA), polyvinyl alcohol derivative, polymer or copolymer of unsaturated carboxylic acid, or a salt thereof. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, maleic anhydride, maleic acid, and fumaric acid. Among the above, carboxymethylcellulose and polyvinyl alcohol are particularly preferred.

When the binder is a crosslinked product, the physical strength of the pulp fiber deposited sheet 1 is improved, which is preferable. The crosslinking agent which crosslinks the binder crosslinks with the binder to cause the binder to have a crosslinked structure, thereby improving the physical strength. When a binder having a carboxyl group such as carboxymethyl cellulose is used, it is preferable to use a polyvalent metal ion as the crosslinking agent, and examples of the polyvalent metal ion include an alkaline earth metal such as zinc, calcium or barium. Metal ions such as magnesium, aluminum, manganese, iron, cobalt, nickel, and copper. Among them, ions such as zinc, calcium, barium, magnesium, aluminum, iron, cobalt, nickel, and copper can be preferably used. These are preferred in terms of imparting sufficient wet strength. The polyvalent metal ion as the crosslinking agent is used in the form of a water-soluble metal salt such as a sulfate, a chloride, a hydroxide, a carbonate or a nitrate. Further, when polyvinyl alcohol is used as the water-soluble binder, a titanium compound, a boron compound, a zirconium compound, a compound containing ruthenium or the like may be used as the crosslinking agent, or one of the compounds may be used or A variety of blends are used as crosslinkers. Examples of the titanium compound include titanium lactate and titanium triethanolamine. Examples of the boron compound include borax and boric acid. Further, examples of the zirconium compound include ammonium zirconium carbonate and the like, and examples of the compound containing ruthenium include For example, sodium citrate or the like can be mentioned.

The content of the above-mentioned binder in the pulp fiber deposited sheet 1 with respect to the liquid permeable pulp fiber deposited layer 2 is preferably from 1 to 20% by weight. When the content is less than 1% by weight, the strength of the pulp fiber deposited sheet 1 is insufficient. On the other hand, when it exceeds 20% by weight, the flexibility of the pulp fiber deposited sheet 1 is lowered.

The liquid-permeable pulp fiber deposited layer 2 constituting the pulp fiber-receiving sheet 1 includes a plurality of fiber crimping portions 2a, 2a, ... formed by compression and pressing, and has the above-mentioned fiber crimping portion In the method of pulverizing the pulp fibers 2b of 2a and 2a, the fiber crimping portion 2a is formed. Therefore, the shape of the pulp fiber stacking sheet 1 can be stably maintained, and the appropriate strength can be obtained, and on the other hand, moderate flexibility can be obtained. . When the above-mentioned binder is a water-soluble binder such as carboxymethylcellulose, the pulp fiber sheet 1 becomes a hydrolyzable pulp fiber sheet having good hydrolyzability. Further, when the binder is made of polyvinyl alcohol, it may be a hydrolyzable pulp fiber sheet having good hydrolyzability depending on conditions, or may be a non-hydrolyzed pulp fiber sheet. Further, in the present invention, the hydrolysis means that the strength between the fibers constituting the paper in the dry state is minimal, and the strength required for the functions such as forming and wiping is minimized, and if it is discarded into the water, When it is immersed in water as it is, the adhesion force is extremely lowered, and if any external force is applied, it is easily decomposed or dispersed. Further, in the present invention, the non-hydrolysis means that the adhesive force between the fibers constituting the paper is minimally required to have a function such as a forming process and a wiping function, even if it is immersed in water wetly. In the state, no matter what external force is applied, it is not easily dispersed or the like.

In other words, the pulp fiber deposited sheet 1 can be produced without a papermaking step, and can maintain its shape and have an appropriate strength even if it is not formed as a laminate of the sheet obtained by papermaking.

1 and 2 show the schematic configuration of the pulp fiber stacking sheet 1. The pulp fiber deposited sheet 1 is provided with the above-mentioned fiber crimping portion 2a having a plurality of fine concave shapes in a scattered manner. The distance between the adjacent fiber crimping portions 2a and the fiber length of the pulverized pulp fibers 2b are adjusted so as to have the pulverized pulp fibers 2b which are adjacent to the adjacent fiber crimping portions 2a and 2a. The pulverized pulp fiber 2b may also span the above-mentioned fiber crimping portion 2a of three or more portions. The compression and pressing portions are preferably formed by embossing. It is sufficient that the plurality of the fiber crimping portions 2a are provided as long as they are provided, and the form thereof may be appropriately changed as needed. In the example shown in FIG. 3, in the fiber crimping portion 2a, the fiber crimping portion 2a having a concave shape in the pulp fiber stacking sheet 1 has a linear shape.

When the pulp fiber stacking sheet 1 is impregnated with the cleaning liquid and is in a wet state, it can be used for body wiping, toilet paper, or other cleaning sheets for infants.

Then, the above manufacturing method has the steps of: a fiber stacking step of depositing a raw material fiber composed of the pulverized pulp 5 or mainly the pulverized pulp 5 on a mesh body by suction to form a fiber accumulation body; and a crimping and pressing step By compressing and pressing, the obtained fiber deposit body is formed into a plurality of fiber crimping portions 2a in the fiber deposit body so as to have the pulverized pulp fibers 2b spanning the adjacent fiber crimping portions 2a; a coating step of applying a binder to at least one surface of the fiber stack; and a drying step of drying the fiber stack after the binder coating step to form a liquid permeable pulp fiber layer 2 .

Fig. 4 is a view showing a schematic configuration of a manufacturing method. In the figure, reference numeral 3 denotes an original sheet of the pulp material of the above-mentioned raw material fiber, and reference numeral 4 in the figure is a wound body of the pulp fiber deposited sheet 1 produced.

(1) The above pulp material is first sent to the pulverizing device 6 to become the pulverized pulp 5. Reference numeral 6a is a fixed blade constituting the pulverizing device 6, and reference numeral 6b is a rotary blade constituting the pulverizing device 6.

(2) The pulverized pulp 5 is finally formed into a fiber deposit of the pulp fiber deposited sheet 1 in the fiber stacking device 7. The fiber stacking device 7 is configured such that the pulverized pulp 5 is adsorbed to the web-like conveyor belt 7a as the mesh body by receiving the inner side of the conveyor belt 7a as a negative pressure. Upper surface.

(3) In the present embodiment, the fiber stack is further pressed by the flat roll 8 before the pressure bonding and pressing steps. In the illustrated example, a flat roll 8 in which the fiber stack is interposed between the discharge end 7b and the unloading end 7b of the conveyor belt 7a constituting the fiber stacking device 7 is disposed. As a result, in the present embodiment, the fiber deposit is fed into the sheet shape of the embossing roll 9 which is less likely to adhere to the pressure bonding and pressing step.

(4) In the present embodiment, the pressure bonding and pressing step of the fiber deposition body is performed by an embossing machine using an embossing roll. In the illustrated example, the fiber stack is fed between the upper and lower embossing rolls 9, 9 so that there is a pulverized pulp fiber 2b spanning the adjacent fiber crimping portions 2a, 2a. A plurality of fiber crimping portions 2a are formed on the liquid permeable pulp fiber accumulation layer 2. As the embossing roll, a conventionally known one in which a plurality of protrusions for embossing are formed on the circumferential surface of the roll can be used. At this time, the liquid permeable pulp fiber accumulation layer 2 is in a non-wet state, and the embossing process is performed on the fiber accumulation layer in a non-wet state. Here, the non-wet state means that water is not supplied to the liquid-permeable pulp fiber layer 2 to supply water to the liquid-permeable pulp fiber layer 2 . Usually, the paper material contains moisture (moisture) corresponding to temperature and humidity conditions. However, since the moisture (moisture) is not actively supplied from the outside, even if such moisture (moisture) is contained, it corresponds to a non-wet state. Therefore, although the content ratio of moisture (moisture) contained in the fiber accumulation layer varies depending on the temperature and humidity conditions, it can be said to be equivalent to a non-wet state regardless of the content rate.

(5) In the example of the above-described fiber deposit after the pressure bonding and pressing step, the fiber stack is stacked (mounted) on the upper surface and transported on the conveyor 10, and After the binder is supplied to one surface of the fiber stack, the binder is supplied to the other side of the fiber stack from the side of the conveyor 11 which is transported in the longitudinal direction of the fiber stack to coat both sides of the fiber stack. Cloth adhesive. There is also a case where the adhesive is applied to only one side of the above fiber stack. The supply of the adhesive is typically carried out by spraying a solution of the adhesive from the nozzle 12 of the spray device. The spray nozzle 12 for spraying can be arbitrarily selected from those known in the art. The above-described supply of the binder is not limited to the spray, and other known methods such as coating using a roll coating device such as a gravure press or a flexographic printer may be used. The crosslinking agent can be supplied simultaneously with the binder, but the crosslinking agent is not limited to being supplied together with the binder, and can be supplied and added at any time during the production step.

(6) The fiber deposit after the application of the above-mentioned binder is sent to a drying device 13 for drying. This drying is preferably carried out by electromagnetic wave drying. The reason for this is that the fiber crimping portion 2a is required to be dried in a state in which the binder is applied to the fiber deposition body in which the plurality of fiber crimping portions 2a are formed by the pressure bonding and pressing steps. The shape is easy to lose. Further, the drying may be arbitrarily selected by a conventionally known method such as hot air drying or infrared drying. Further, the drying is not limited to the case of drying by one drying device, and a plurality of drying devices may be provided, and the liquid permeable pulp fiber deposition layer 2 is sequentially supplied to each drying device. Dry while drying.

In the present embodiment, the binder is not applied to the fiber deposit, dried, and then embossed, and the binder is applied after the embossing, and then dried. If the adhesive is applied before the embossing, the embossing process will cause a lot of damage to the fibers constituting the fiber stack, and also cause a lot of surface layer of the adhesive formed on the surface of the fiber stack. As a result, in the present embodiment, there is an advantage that such damage is not caused to the fiber deposition body or even the cleaning sheet 1 produced therefrom.

(7) In the present embodiment, after the drying, both edges of the fiber stack in the transport direction are linearly cut along the transport direction, and the pulp generated from the fiber stack is arranged. The shape of the fiber stacking sheet 1. In the illustrated example, the above-described cutting is performed by feeding the fiber deposition body between the pair of upper and lower cutting rolls 14, 14.

(8) The pulp fiber stacking sheet 1 produced as described above is folded as needed. Further, by impregnating the pulp fiber stacking sheet 1 produced as described above, it is possible to use it as a body wipe for infants, toilet paper or other cleaning articles.

Next, a method of manufacturing the pulp fiber deposited sheet 101 by the air-laid method of the second embodiment will be described with reference to Figs. 5 to 7 . Here, in the second embodiment, the raw material (material) of the pulp fiber deposited sheet 101, the basis weight, the applicable adhesive, the crosslinking agent, the drying method, and the like can be suitably applied to the above embodiment, and thus the repetition is omitted. Description. In addition, in FIG. 5, in order to avoid complication of the drawings, the pulp fiber stacking sheet 101 is denoted by only the final part of the production line 100, and the other portions are not shown. Similarly, the illustration of the pulp fibers 103 is also omitted.

Fig. 5 is a view showing a production line of the pulp fiber stacking sheet 101 of the second embodiment; A diagram of the outline of 100. The manufacturing steps of the production line 100 are roughly divided into a pre-crushing step, a pulverizing step, a fiber stacking step, a pressing step, a binder coating step, and a drying step.

The pre-crushing step has a liquid supply step and a pulp detecting step. The liquid supply step is a step of supplying the liquid to the pulp fibers 103 by the liquid supply device 104. Further, the pulp detecting step is a step of detecting whether or not the pulp fibers 103 are being supplied to the production line 100 by the pulp detecting device 105. Further, the width (length in the y direction) of the pulp fiber 103 is about 900 mm to 1800 mm, and the production line 100 is designed and manufactured in accordance with the width thereof.

Fig. 6 is a schematic view showing a liquid supply step and a pulp detecting step. As shown in Fig. 6, in the liquid supply step, the liquid supply device 104 supplies the liquid to the central region 104a of the transferred pulp fibers 103. As described below, the pulp fiber 103 is likely to have static electricity caused by the fibers being deposited on the net and being transported. Further, there is a case where the pulp fiber deposition sheet 101 produced by the production line 100 is used as an absorbent body for absorbing excrement. Therefore, as the liquid supplied from the liquid supply device 104, a solution such as ethanol, methanol or 2-propanol (IPA) or water can be used as the antistatic. Further, as the liquid supplied from the liquid supply device 104, as the deodorization of the excrement, activated carbon; zeolite; vermiculite; ceramic; large grain stone; charcoal polymer; carbon nanotube; carbon nanohorn; Organic acids such as acid and succinic acid, alum (potassium aluminum sulfate).

In addition, although the liquid supply device 104 is shown as one unit in FIG. 5, it may be provided in combination with the use, such as antistatic or deodorizing. Further, the central region 104a may be a liquid supply region, and the region shifted in the Y direction of FIG. 5 may be a liquid supply region. In the present embodiment, the entire Y direction of the pulp fibers 103 is not the liquid supply region, and a partial region such as the central region 104a is used as the liquid supply region. The reason for this is that since the pulp fiber 103 is pulverized into a cotton shape in the pulverization step described below, The pulverized and pulverized pulp fibers 103 are supplied to substantially the entire liquid. Thereby, excessive liquid supply by the liquid supply device 104 can be prevented, and the manufacturing cost of the pulp fiber deposition sheet 101 can be suppressed. As an example, the length of the central region 104a in the Y direction is about 10% to 50% of the width of the pulp fiber 103, and the length in the X direction may be the same as the length in the Y direction, or may be shorter than the length in the Y direction (25%~ About 75%). Further, in Fig. 6, the central portion 104a has a rectangular shape, but may be circular or elliptical.

Further, the liquid supply device 104 can adjust the supply amount of the antistatic liquid according to the humidity of the production line 100. Specifically, when the liquid supply device 104 is dried in a room where the production line 100 is installed (for example, when the humidity is 50% or less), and when the room in which the production line 100 is installed is not dried (for example, a humidity of 65% or more) In the case of the case, it is sufficient to increase the supply amount of the antistatic liquid. In other words, the liquid supply device 104 may increase the supply amount of the antistatic liquid according to the decrease in humidity.

Similarly, the liquid supply device 104 may change the supply amount of the deodorizing liquid in accordance with the use of the pulp fiber deposition sheet 101. Specifically, the liquid supply device 104 may increase the supply amount of the deodorizing liquid in the absorbent body, and may reduce the supply amount of the deodorizing liquid when used in the outer casing. Further, in the deodorizing liquid, a liquid in which metal is dissolved may be used. Therefore, when the pulp fiber stacking sheet 101 becomes a skin contact surface (when it comes into contact with the skin), the liquid supply device 104 stops the supply of the deodorizing liquid.

The other step of the pre-crushing step is a step of detecting whether or not the pulp fiber 103 is being conveyed. This is a state in which the roll-shaped pulp fibers 103 are conveyed and the pulp fibers 103 are not conveyed. The pulp detecting device 105 irradiates the detection light 105a downward, and detects that the pulp fiber is positive when the reflected light from the pulp fiber 103 is detected by the detecting unit (not shown). It is carried. When the pulp detecting device 105 cannot detect the reflected light by a detecting unit (not shown), it is considered that the pulp fiber is not detected, and the warning is performed by sound, light emission, or the like.

In the production line 100, after the pre-grinding step, in the pulverizing step, the pulverizing means 106 is used to pulverize the pulp fibers 103. The pulverizing apparatus 106 has a primary pulverizing section and a secondary pulverizing section, and the pulp fibers 103 are pulverized into small pieces by the primary pulverizing section, and the pulverized pulp fibers 103 are pulverized into a cotton shape by the secondary pulverizing section. Further, in the pulverization step, in order to prevent the pulverized pulp fibers 103 from being scattered, the primary pulverization portion and the secondary pulverization portion are housed by a casing or the like. Further, in the second embodiment, the pulverized pulp is preferably made 100%, but the conjugate fiber (ES fiber) may be mixed. Further, it may be pulverized into a cotton shape by the primary pulverizing portion, and in this case, the secondary pulverizing portion may be omitted.

On the production line 100, after the pulverization step, the fiber-like pulp fibers 103 are subjected to fiber accumulation using the fiber stacking device 107 in the fiber stacking step. The cotton-like pulp fibers 103 are accumulated in the three grooves 107a, 107b, and 107c through the pipe 108 by high-pressure air or the like. In addition, the number of slots is not limited to three. Further, in the fiber stacking step, in order to prevent scattering (diffusion) of the cotton-like pulp fibers 103, a shatterproof preventing cover is provided. Thereby, the situation in which the worker of the production line 100 inhales the pulp fibers 103 is reduced. Further, in the second embodiment, the average fiber length of the pulverized pulp fibers 103 is, for example, about 1 mm to 3 mm.

The cotton-like pulp fibers 103 accumulated in the three grooves 107a, 107b, and 107c are deposited on the lower-side transfer net 109. The lower transfer net 109 has a mesh shape, and a polymer compound can be used as the material thereof, and a synthetic resin (thermoplastic resin) such as polytetrafluoroethylene or a synthetic fiber such as nylon or PET can be used. As the lower side transfer net 109, it can be used for 1 inch x 1 inch. There are 30 counts to 50 counts of 30 to 50 meshes, and in the second embodiment, 40 nets (for example, 0.5 mm × 0.5 mm) are used, but the present invention is not limited thereto.

The lower transfer net 109 conveys the cotton-like pulp fibers 103 in which the fibers are deposited in the X direction in the drawing by a driving force from a driving source (not shown). Further, the lower transfer net 109 is repeatedly conveyed with the cotton-like pulp fibers 103 in a predetermined driving range (the step from the fiber stacking step to the pressing step by the flat rolls 112) by the four rolls 110.

A vacuum device 111 is disposed below the lower transfer net 109. The vacuum device 111 adsorbs the cotton pulp fibers 103 through the mesh-shaped transfer net 109.

Fig. 7 is a schematic view showing a cotton-like pulp fiber 103 in which fibers are piled up. As shown in Fig. 7 (a), the cotton-like pulp fibers 103 which are deposited from the grooves 107a to the transfer net 109 are increased (higher) on the right side of the fiber accumulation time, and are piled up toward the left side. The time becomes shorter, so it becomes less (lower). However, as the amount of fiber accumulation increases, the adsorption force by the vacuum device 111 becomes weak. Conversely, in the portion where the amount of load is small, the adsorption force by the vacuum device 111 is not easily weakened.

Therefore, as shown in Fig. 7(b), the fiber accumulation amount of the cotton-like pulp fibers 103 which are deposited from the grooves 107b to the transfer net 109 is less than the position of the transfer net 109. Further, as shown in Fig. 7(c), the fiber accumulation amount of the cotton-like pulp fibers 103 which are deposited from the grooves 107c to the transfer net 109 is substantially uniform regardless of the position of the transfer net 109. As described above, by the change in the adsorption force of the vacuum device 111, the amount of the pulp of the cotton-like pulp fibers 103 in which the fibers are deposited on the transfer net 109 can be made substantially uniform. In addition, when the amount of the pile of the cotton-like pulp fiber 103 is uneven due to the difference in position, the position of the vacuum suction port (not shown) may be moved, or the number of the vacuum adsorption ports may be changed to adjust. .

Further, immediately above the transfer net 109, a relatively strong adsorption force is applied to the vacuum device 111. Therefore, the cotton-like pulp fibers 103 are densely packed with fibers, and on the other hand, they are separated from the transfer net 109 ( As it moves away from the +Z direction, the adsorption force by the vacuum device 111 becomes weak, and the cotton-like pulp fibers 103 become sparse. When the pulp fiber stacking sheet 101 produced by the production line 100 is made into a product, if it is a floor sheet or a toilet paper or the like, the liquid medicine is applied to the surface of the cotton pulp fiber 103. Can reliably remove stains. On the other hand, if it is a product for skin, such as a sheet for a body or a sheet for the face, the skin can be provided by applying a liquid to the surface of the cotton pulp fiber 103. Use products.

In the production line 100, after the fiber stacking step, in the pressing step, the piled cotton-like pulp fibers 103 are pressed using a plurality of pressing means. In the second embodiment, the pressing step includes a first pressing step, pressing until the first adhesive applying step described below, and a second pressing step of pressing until the first drying and the following second Adhesive coating step. The flat roller 112 has a pair of roller members for pressing the fiber-formed cotton-like pulp fibers 103 to adjust its bulkiness. In the second embodiment, a pressure of 4 kgf/cm ^{2 is} applied to the flat roller 112. Thereby, the lower surface of the pulp fiber 103 (the surface in contact with the lower-side conveying net 109) is formed with the mesh-like irregularities of the lower-side conveying net 109. The pressure of the flat roll 112 may be set to be between ² Kgf/cm ² and 8 Kgf/cm ² , and may be set according to the use of the product using the pulp fiber deposited sheet 101, or the hydrolyzable product or the non-hydrolyzed product.

As described above, the net of the lower transfer net 109 is 40 (for example, 0.5 mm × 0.5 mm), and the irregularities of the mesh shape are formed at intervals of 0.5 mm. On the other hand, since the average fiber length of the pulverized pulp fiber 103 is about 1 mm to 3 mm, the pulverized pulp fiber 103 crosses the unevenness of the mesh shape.

When the mesh shape of the pulp fiber 103 is not desired, the pressure of the flat roll 112 may be set to less than ² Kgf/cm ² , and if the lower transfer net 109 has pressure resistance, 8 Kgf/ may be applied. The pulp fiber 103 is formed into a mesh shape at a pressure of cm ² or more. Further, the liquid supply device 104 may be provided before and after the flat roller 112 to supply at least one of the antistatic and deodorizing liquids. Further, 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 transfer net 109 carries the pressing step of transferring the pulp fibers 103 to the flat rolls 112. Before the pressing step of the flat roller 116, the pulp fiber 103 is conveyed by the upper transfer net 113 and the vacuum device 115. Specifically, the vacuum device 115 provided on the upper side of the transfer surface of the upper transfer net 113 passes through the upper transfer net 113 in contact with the upper surface of the pulp fiber 103, and is vacuum-adsorbed on the pulp fiber 103 pressed by the flat roll 112. surface. In this state, the pulp fiber 103 is conveyed in the X direction in the drawing by a driving force from a driving source (not shown). Further, the transfer net 113 repeatedly conveys the pulp fibers 103 in a predetermined driving range (pressing step of the flat rolls 116) by the four rolls 114.

The flat roller 116 has a pair of roller members, and presses the pulp fibers 103 passing through the flat rolls 112 to adjust the bulkiness thereof, or forms the net shape of the upper transfer net 113 on the upper surface of the pulp fibers 103 (with the upper transfer net 113). Contact surface). Similarly to the lower conveyance net 109, the upper transfer net 113 is a net of 40 pieces. Further, the pressure of the flat rolls 116 is also set between ² Kgf/cm ² and 8 Kgf/cm ² . The pulp fiber 103 can be made soft by the multiple pressing of the flat roller 112 and the flat roller 116.

The embossing roll 117 cooperates with the roll on the lower side of the flat roll 116 to emboss the pulp fiber 103 passing through the flat roll 116. In the second embodiment, the corrugated roll is embossed. Its shape can be any shape. Further, a plurality of embossing rolls 117 may be provided to perform a plurality of embossing processes. In this case, it may be an embossing roll of the same shape or an embossing roll of a different shape. Further, in the second embodiment, the pressure of the embossing roll 117 is set to be higher than the pressure set by the flat rolls 112 and 116, and is set, for example, between 4 Kgf/cm ² and 10 Kgf/cm ² . Further, the number of times of embossing may be set according to the use of the product using the pulp fiber stacking sheet 101, or the hydrolyzable product or the non-hydrolyzed product, or the embossing may not be performed. When the embossing is not performed, the interval between the pair of roller members may be set to be larger than the thickness of the pulp fiber stacking sheet 101 in the Z direction. Further, as is clear from Fig. 5, the pulp fibers 103 are not present in the transfer net during embossing. This is to prevent damage to the transport net due to embossing. Instead of the cooperation with the roller on the lower side of the flat roll 116, the pulp fiber 103 may be embossed by the cooperation of the lower side transfer net 118 and the embossing roll 117 described below. In this case, the position of the embossing roll 117 may be shifted in the positive X direction in FIG. 5 so that the embossing roll 117 and the lower transfer net 118 may face each other. Further, instead of the embossing roll 117, the pulp fiber 103 may be pressed by the flat roll and the lower transfer net 118.

In the second embodiment, the liquid supply device 104 supplies the liquid to the pulp fiber 103. However, in the second embodiment, the pulp fiber 103 may be non-wetting until the pressing step. For example, The water content of the pulp fiber 103 may be less than 15% at the time of the pressing step, and may be such that it is not affected by static electricity during the transportation by the net. Therefore, in the second embodiment, when the moisture content of the pulp fiber 103 is less than 15% at the pressing step, it can be said to correspond to a non-wet state.

Further, 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 to set the temperature of the pulp fiber 103 to 40 ° C to 70 ° C. On the left and right sides, in the binder step described below, when the binder is easily infiltrated into the pulp fibers 103, the amount of the binder applied can be reduced, and the manufacturing cost can be reduced. Further, the flat rolls 112, 116 and the embossing roll 117 may be heated so that the temperature of the pulp fiber 103 becomes the same temperature as the melting temperature of the adhesive (for example, 40 ° C to 60 ° C).

In the production line 100, after the pressing step, the binder fibers are applied to the pulp fibers 103 in the binder coating step to form the liquid permeable pulp fiber deposition layer described in the above embodiment. In the second embodiment, the adhesive application step includes a first adhesive application step and a second adhesive application step, and has a lower portion between the first adhesive application step and the second adhesive application step. The first drying step is described. Here, the first adhesive application step will be described.

In the first adhesive application step, a binder is applied to the upper surface of the pulp fiber 103 by the first coating device 121, and the first coating device 121 is disposed above the pulp fiber 103 and has a direction opposite to the pulp fiber 103. Multiple nozzles. The pulp fiber 103 is placed on the mesh-side lower-side transfer net 118, and is transported in the X direction by being sucked in the -Z direction by the vacuum device 120 provided below the lower transfer net 118. The net of the lower transfer net 118 may be a net larger than the lower transfer net 109 and the upper transfer net 113, and may be used in a number of 10 to 30 counts. In the second embodiment, it is 16 A net (for example, 1.0 mm x 1.0 mm). Further, the lower transfer net 118 is repeatedly conveyed by the four rolls 119 in a predetermined driving range (first adhesive application step).

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

As a binder applied (sprayed) to the upper surface of the pulp fiber 103, In the second embodiment, the binder is used in the case of the pulp fiber 103 for a hydrolyzable product, and the pulp fiber is used in the non-hydrolyzable product. In the case of 103, EVA is used. Further, as described above, on the upper surface side of the pulp fiber 103, the cotton-like pulp fiber 103 is thinner than the lower surface side of the pulp fiber 103, and thus the adhesive is apt to permeate. Therefore, it is possible to reduce the tendency of the adhesive applied (sprayed) to the upper surface of the pulp fiber 103 to remain on the upper surface of the pulp fiber 103.

On the production line 100, following the first adhesive application step, a first drying step as one of the drying steps is performed. In the first drying step, the pulp fibers 103 placed on the mesh-side lower transfer net 122 are subjected to electromagnetic wave drying from the upper surface side of the pulp fibers 103 as indicated by the arrow. . Further, the first drying device 124 can be used for hot air drying or infrared drying as described in the above embodiment. In the state in which the pulp fiber 103 is adsorbed by the vacuum device 125 located below the transport surface of the lower transfer net 122, the lower transfer net 122 is surrounded by four rolls 123 (only two are shown). The pulp fiber 103 is repeatedly conveyed in a predetermined driving range (first drying step). The lower transfer net 122 can use 10 to 30 counts, and in the second embodiment, 22 (for example, 0.7 mm x 0.7 mm) nets.

After the embossing by the embossing roll 117, the first adhesive application step and the first drying step are performed, whereby the embossed shape formed on the pulp fibers 103 is easily maintained.

On the production line 100, following the first drying step, a second pressing step is performed. The second pressing step is performed by the embossing roller 126. The embossing roll 126 has a pair of roll members, and is similar to the emboss roll 117 in the form of a corrugated embossing roll, but its shape may be any shape. Further, a plurality of embossing rolls 126 may be provided to perform a plurality of embossing processes. In this case, it can be the same Shaped embossing rolls can also be embossing rolls of different shapes. Further, the pressure of the embossing roller 126 can also be set in the same manner as the embossing roller 117. Further, as is apparent from Fig. 5, in the embossing roll 126, the pulp fibers 103 are not present in the transfer net during embossing, but may be stored in the transfer net. Additionally, the embossing roll 126 may not be disposed on the production line 100. In this case, a flat roller may be provided instead of the embossing roller 126. Further, in the case where the embossing roll 126 is provided, a flat roll may be used in combination.

It is desirable to heat the embossing roll to one of the embossing rolls 126 as described above. Further, since the second pressing process is also performed before the second adhesive application step and the second drying step described below, it is easy to maintain the embossed shape formed on the pulp fibers 103. Further, the second pressing process may be omitted, and the embossing roll 126 itself may be omitted, as long as the interval between the pair of roller members is larger than the thickness of the pulp fiber stacking sheet 101 in the Z direction as described above.

On the production line 100, following the second pressing step, a second adhesive application step is performed. In the second adhesive application step, a binder is applied to the lower surface of the pulp fiber 103 by the second coating device 130, and the second coating device 130 is disposed below the pulp fiber 103 and has a direction opposite to the pulp fiber 103. Multiple nozzles. The pulp fiber 103 is transported in the X direction by the vacuum 129 in the state of being adsorbed in the +Z direction by the mesh-side transfer net 127 which is in contact with the pulp fibers 103. Further, the upper transfer net 127 repeatedly conveys the pulp fibers 103 in a predetermined driving range (second adhesive application step) by the four rolls 128. The number of the upper transfer nets 127 may be the same as the number of the lower transfer nets 118.

That is, in the second adhesive application step, the second coating device 130 applies the adhesive to the lower surface (the -Z direction) of the lower surface of the pulp fiber 103 from the lower side (+Z direction), and is vacuumed. The device 129 adsorbs the upper surface of the pulp fiber 103 toward the upper side (+Z direction).

The adhesive applied in the second adhesive coating step is bonded to the first adhesive The adhesive applied in the coating step is the same. In the second adhesive application step, the adhesive is applied to the lower surface of the pulp fiber 103 from a plurality of nozzles located below the pulp fibers 103, so that the adhesive that does not penetrate the pulp fibers 103 will fall without remaining. Since the pulp fiber 103 is used, uneven coating of the adhesive does not occur. Therefore, it is possible to reduce unevenness in strength or unevenness in drying of the pulp fiber deposited sheet 101 after the second drying step described below.

Further, in the first and second adhesive application steps, the binder fibers are applied to the upper surface and the lower surface of the pulp fibers 103 without inverting the pulp fibers 103. Therefore, the complication of the production line 100 can be avoided, and the conveyance of the pulp fibers 103 can be speeded up.

In the first and second adhesive application steps, a protective cover such as a diffusion preventing agent is attached to form a closed space, and the adhesive which is not applied to the pulp fibers 103 is recovered by a pump or the like, and is again supplied to the first In the coating device 121 and the second coating device 130, the amount of the binder used can be reduced, and the manufacturing cost of the pulp fiber stacking sheet 101 can be reduced.

On the production line 100, following the second adhesive application step, a second drying step as another drying step is performed. In the second drying step, the pulp fiber 103 passes through the mesh-side upper transfer net 131 which is in contact with the upper surface of the pulp fiber 103, and is disposed above the transfer surface of the upper transfer net 131 by the vacuum device 132. In the state of being adsorbed in the +Z direction, it is transported in the X direction. In the second drying step, the second drying device 133 is electromagnetically dried from the lower surface side of the pulp fiber 103 as indicated by the arrow. Further, hot air drying or infrared drying as mentioned in the above embodiment can also be used.

Further, in the state in which the pulp fiber 103 is adsorbed by the vacuum device 132 as described above, the upper transfer net 131 is in a predetermined driving range by the four rolls 134 (only two are shown) (second drying step) The pulp fiber 103 is conveyed repeatedly in the inside. Upper side transfer net 131 The number of the counts may be the same as the number of the lower transfer nets 122.

Further, embossing can be performed after the second drying step.

On the production line 100, the pulp fiber deposition sheet 101 is conveyed through the second drying step, and the pulp fiber deposition sheet 101 is conveyed by the conveyance roller 135, and is taken up by the two take-up rolls 136 and 137.

As described above, in the second embodiment, the pulp fiber deposited sheet 101 is not produced through the papermaking step. In addition, the pulverization step may be set so as to be an average fiber length across the mesh based on the number of the lower transfer net 109 and the upper transfer net 113.

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

1‧‧‧Pulp fiber stack

2‧‧‧liquid-permeable pulp fiber accumulation layer

2a‧‧‧Fiber crimping department

Claims (21)

A pulp fiber accumulation sheet comprising a liquid-permeable pulp fiber accumulation layer containing a raw material fiber composed of pulverized pulp or mainly pulverized pulp, and a binder, and having a plurality of fiber pressures formed by compression and pressing And the fiber crimping portion is formed in such a manner that the pulverized pulp fibers are present across the adjacent fiber crimping portions. The pulp fiber deposited sheet of claim 1, wherein the binder is present in an amount of from 1 to 20% by weight based on the liquid-permeable pulp fiber layer. A pulp fiber deposited sheet according to claim 1 or 2, wherein the binder is carboxymethylcellulose. A pulp fiber deposited sheet according to claim 1 or 2, wherein the binder is polyvinyl alcohol. The pulp fiber deposited sheet according to any one of claims 1 to 4, which is further impregnated with a cleaning liquid and in a wet state. The pulp fiber deposited sheet according to any one of claims 1 to 5, wherein the binder is contained in a crosslinked state. The pulp fiber stacking sheet according to any one of claims 1 to 6, wherein the compression and pressing portions are formed by embossing. A method for producing a pulp fiber stacking sheet, comprising: a fiber stacking step of depositing a raw material fiber composed of pulverized pulp or mainly pulverized pulp on a mesh body by suction to form a fiber accumulation body; crimping, In the pressing step, by compressing and pressing, the obtained fiber accumulation body is formed in the fiber accumulation body in such a manner that there is a pulverized pulp fiber which crosses the adjacent fiber crimping portion. a fiber crimping portion; a binder coating step of applying a binder to at least one surface of the fiber deposit formed with the fiber crimping portion; and a drying step of depositing the fiber after the binder coating step The body is dried and becomes a liquid-permeable pulp fiber accumulation layer. The method for producing a pulp fiber deposited sheet according to claim 8, wherein the binder coating step applies a binder to both sides of the fiber stack. The method for producing a pulp fiber deposited sheet according to claim 8 or 9, wherein the crimping and pressing step is performed by an embossing roll. The method for producing a pulp fiber deposited sheet according to claim 10, wherein the pressing of the flat roll is further performed before the step of pressing and pressing the embossing roll. The method for producing a pulp fiber deposited sheet according to any one of claims 8 to 11, wherein the drying step is carried out by electromagnetic wave drying. The method for producing a pulp fiber deposited sheet according to any one of claims 8 to 12, wherein the binder is carboxymethylcellulose. The method for producing a pulp fiber deposited sheet according to any one of claims 8 to 12, wherein the binder is polyvinyl alcohol. A method for producing a pulp fiber deposited sheet, comprising: using a pulverized raw material fiber to produce a fiber deposited sheet, comprising the steps of: applying a binder to the raw material fiber from a first direction; and adsorbing the raw material fiber along the first direction; And applying a binder to the raw material fiber in a second direction different from the first direction, along the second The raw material fiber is adsorbed in the direction. The method for producing a pulp fiber deposited sheet according to claim 15, wherein the coating of the adhesive from the second direction is coating of the adhesive on the lower surface of the raw material fiber, and along the The step of adsorbing the raw material fibers in the second direction is the adsorption of the upper surface of the raw material fibers. The method for producing a pulp fiber deposited sheet according to claim 15, comprising the step of transporting the raw material fiber; and the transferring step of adsorbing the raw material fiber through a contact member contacting the upper surface of the raw material fiber The surface is transported. The method for producing a pulp fiber deposited sheet according to claim 15, comprising the step of supplying a gas in the first direction before applying the adhesive from the second direction. The method for producing a pulp fiber deposited sheet according to claim 15, comprising the step of supplying a gas in the second direction after applying the adhesive from the second direction. A method of producing a pulp fiber deposited sheet according to claim 15 which comprises a pressing step of pressing the raw material fiber before applying the adhesive from the first direction. A method of producing a pulp fiber deposited sheet according to claim 15 which comprises a step of removing static electricity of the raw material fibers.