KR102510363B1 - Water-disintegrable sheet - Google Patents

Abstract

A water-decomposable sheet in which a base paper sheet to which a water-soluble binder is added is impregnated with a chemical liquid, wherein the base paper sheet is obtained by ply-processing a plurality of base paper sheets, and has a weight per unit area of 30 to 150 gsm. The compounding ratio of is less than 1/1, the chemical solution contains a crosslinking agent that causes a crosslinking reaction with the water-soluble binder, and a trihydric or higher polyhydric alcohol, and 1 to 20% by weight of the above 3 It is impregnated with more than one polyhydric alcohol.

Description

Water decomposable sheet {WATER-DISINTEGRABLE SHEET}

The present invention relates to a water-decomposable sheet.

In the past, rags made of woven fabric that are used repeatedly have been used to clean toilets, but in recent years, disposable wet sheets made of paper have been used instead of these. In addition, it is preferable that this kind of wet sheet is provided in a state impregnated with a detergent and can be disposed of by flushing it down the toilet after use.

In such a wet sheet, it is required to secure paper strength that does not tear in a wet state impregnated with a detergent during wiping work and decomposability in water to the extent that it does not clog pipes when spilled in a toilet or the like. As one technique, it is known to use a water-soluble paper to which a water-soluble binder containing carboxymethyl cellulose (CMC) or the like is added as the base material (see Patent Document 1, for example).

Patent Publication No. 3865506

However, when a water-decomposable sheet impregnated with a chemical solution containing a detergent or the like is used as a wipe, a water-decomposable sheet in which evaporation of water in the chemical solution is suppressed is preferable in order to exert a cleaning effect in wiping an object.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a water-decomposable sheet in which evaporation of water in a chemical solution is suppressed.

In order to solve the above problems,

The invention described in claim 1 is a water-decomposable sheet in which a base paper sheet to which a water-soluble binder is added is impregnated with a chemical solution,

The base paper sheet,

A plurality of base papers are ply processed, and the weight per unit area is 30 to 150 gsm,

The blending ratio of softwood pulp to broadleaf pulp is less than 1/1,

The chemical solution contains a cross-linking agent that causes a cross-linking reaction with the water-soluble binder, and a trihydric or higher polyhydric alcohol;

It is characterized in that 1 to 20% by weight of the above trihydric or higher polyhydric alcohol is impregnated with respect to the weight of the base paper sheet.

The invention described in claim 2 is a water-decomposable sheet in which a water-soluble binder is added to a base paper sheet and a chemical solution is impregnated therein,

The base paper sheet,

A plurality of base papers are ply processed, and the weight per unit area is 30 to 150 gsm,

The blending ratio of softwood pulp to broadleaf pulp is less than 2/3,

The chemical solution includes a cross-linking agent that causes a cross-linking reaction with the water-soluble binder;

It is characterized in that 150 to 300% by weight of the chemical solution is impregnated with respect to the weight of the base paper sheet.

The invention described in claim 3 is the water-decomposable sheet according to claim 1 or 2,

The base paper sheet is characterized in that the content of the water-soluble binder is increased from the inner side in the thickness direction of the base paper sheet toward the front and back surfaces.

The invention according to claim 4 is the water-decomposable sheet according to any one of claims 1 to 3,

Characterized in that the emboss is formed on the entire surface.

The invention according to claim 5 is the water-decomposable sheet according to claim 4,

The emboss,

A first emboss;

It is characterized by having a second emboss disposed around the first emboss and having a different shape of the bulging portion from the first emboss.

The invention according to claim 6 is the water-decomposable sheet according to claim 5,

It is characterized in that the first emboss is arranged in a rhombic grid.

The invention described in claim 7 is the water-decomposable sheet according to claim 5 or 6,

It is characterized in that the second emboss is arranged between two of the first emboss.

The invention according to claim 8 is the water-decomposable sheet according to any one of claims 5 to 7,

It is characterized in that the first emboss and the second emboss are in contact with each other to form a continuous emboss.

According to the present invention, it is possible to provide a water-decomposable sheet in which evaporation of water in a chemical solution is suppressed.

1 is a plan view showing an example of a toilet cleaner according to the present embodiment.
Fig. 2A is an enlarged view and sectional view of an embossed portion of the toilet cleaner.
2B is an enlarged view and sectional view of an embossed portion of the toilet cleaner.
Fig. 2C is an enlarged view and sectional view of an embossed portion of the toilet cleaner.
3A is an explanatory diagram showing an example of the contact area of embossing.
3B is an explanatory diagram showing an example of the contact area of embossing.
4 is a flow chart showing a manufacturing method of the toilet cleaner according to the present embodiment.
5 is a schematic view showing an example of a toilet cleaner manufacturing facility (solution applying facility) according to the present embodiment.
Fig. 6 is a schematic view showing an example of a toilet cleaner manufacturing facility (processing facility) according to the present embodiment.
7 is a plan view showing another example of a toilet cleaner according to the present embodiment.
8 is a plan view showing another example of a toilet cleaner according to the present embodiment.
9 is a partially enlarged view of A in FIG. 8 .
10A is a BB cross-sectional view of FIG. 9 .
10B is a CC sectional view of FIG. 9 .

Hereinafter, a water-decomposable sheet according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

In addition, in the water-decomposable sheet of the present invention, the water-decomposable sheet is described taking the toilet cleaner 100 as an example, but the water-decomposable sheet of the present invention includes wet tissues impregnated with a chemical liquid for cleaning purposes other than toilet cleaners. In addition, the conveyance direction of the paper at the time of manufacture of the toilet cleaner 100 is demonstrated as a Y direction (longitudinal direction), and the direction orthogonal to the conveyance direction is X direction (lateral direction).

[Configuration of the toilet cleaner 100]

First, the structure of the toilet cleaner 100 is demonstrated.

The toilet cleaner 100 is a ply-processed (laminated) base paper of a plurality of sheets (for example, two sheets), and is impregnated with a predetermined liquid chemical. Moreover, as shown in FIG. 1, on the whole surface of the seat|seat of the toilet cleaner 100, two types of embossing (EM11 and EM12) are given by embossing. In addition, it is preferable that the contact area with the object to be cleaned or the like produced by the two types of embossing (EM11 and EM12) is about 15 mm 2 to 30 mm 2 per 100 mm 2 .

For example, by arranging the embossments EM11 in a rhombic lattice, unevenness in wiping can be reduced compared to the case where the embossments EM11 are arranged in a square lattice or a rectangular lattice. Also, the embossing (EM12) is arranged between the embossing (EM11).

Moreover, the toilet cleaner 100 is folded into two folds at the central part in the longitudinal direction (Y direction) by being subjected to folding processing. Then, it is stored in a plastic case or packaging film for storage in a folded state, and when used, it is unfolded and used as needed. In addition, the folding method of the toilet cleaner 100 is not limited to folding in two, and may be folded in 4 or 8, for example.

Further, the toilet cleaner 100 of the present embodiment is constituted of a water-decomposable fiber aggregate so that the toilet can be disposed of as it is in a toilet puddle after cleaning the toilet.

As the fiber aggregate, fibers obtained by mixing broad-leaved tree bleached kraft pulp (LBKP) and coniferous tree bleached kraft pulp (NBKP) are used. Preferred raw fibers include those in which the blending ratio of bleached kraft pulp of broadleaf trees among the components of the raw fibers exceeds 50% by weight, that is, those whose blending ratio of bleached softwood kraft pulp to broadleaved tree bleached kraft pulp is less than 1/1. can be heard As more preferable raw fiber, among the components of the raw material fiber, the blending ratio of broadleaved tree bleached kraft pulp exceeds 60% by weight, that is, the blending ratio of softwood bleached kraft pulp to broadleaved tree bleached kraft pulp is less than 2/3. can hear By increasing the compounding ratio of broadleaved tree bleached kraft pulp compared to softwood bleached kraft pulp, the gap between fibers can be reduced and the evaporation of water in the chemical solution can be suppressed. In addition, in order to improve the strength of the base paper sheet, which is the base material of the toilet cleaner 100, carboxymethylcellulose (CMC) is applied to the base paper sheet as a paper strength enhancer. More specifically, it is applied so that the content of CMC increases from the inner side in the thickness direction of the base paper sheet toward the front and back surfaces.

In addition, the toilet cleaner 100 of the present embodiment is impregnated with a predetermined chemical solution, specifically, a predetermined chemical solution containing an auxiliary agent such as a fragrance, a preservative, a disinfectant, an organic solvent, and the like in addition to an aqueous detergent. It is impregnated. It is preferable to impregnate the liquid chemical in an amount of 150 to 300% by weight based on the weight of the base paper sheet of the toilet cleaner 100.

As the chemical solution, an appropriate one can be used. For example, as the aqueous detergent, a lower or higher (aliphatic) alcohol can be used in addition to a surfactant. As the fragrance, one type or several types can be appropriately selected and used from oil-based fragrances such as orange oil in addition to aqueous fragrances. As the antiseptic, for example, parabens such as methyl paraben, ethyl paraben, and propyl paraben can be used. As the disinfectant, for example, benzalkonium chloride, chlorhexidine gluconate, popidone iodine, ethanol, benzanium cetyloxide, triclosan, chlorxylenol, isopropylmethylphenol and the like can be used. As the strength enhancing agent (crosslinking agent), boric acid, various metal ions, and the like can be used. As the organic solvent, polyhydric alcohols such as glycol (divalent), glycerin (trivalent), and sorbitol (tetrahydric) can be used. In the toilet cleaner 100 of the present embodiment, at least a trihydric or higher polyhydric alcohol such as glycerin or sorbitol is used as the organic solvent. In this way, the viscosity of the chemical solution impregnated into the base paper sheet can be increased, and the evaporation of water in the chemical solution can be suppressed. It is preferable to impregnate the trihydric or higher polyhydric alcohol in an amount of 1 to 20% by weight based on the weight of the base paper sheet. The reason why the upper limit of this content rate is 20% by weight is to suppress a decrease in yield due to excessively increasing the viscosity of the chemical solution.

In addition, the adjuvant of the above-mentioned components of the liquid medicine can be appropriately selected, and components that achieve other functions may be included in the liquid medicine as necessary.

As shown in Fig. 2A, the embossing (EM11) has a curved surface at the bulging portion (PR21).

Moreover, as shown in FIG. 2B, the embossing part EM12 has the shape of the bulging part PR22 flat.

Then, since the embossment (EM12) is disposed between the embossments (EM11), the bulging part (PR21) of the embossing (EM11) and the bulging part (PR22) of the embossing (EM12) come close to each other, so that As shown in Fig. 2C, it is formed as continuous embossing (EM21).

Moreover, it may be a case where the bulging part PR21 of the embossing EM11 and the bulging part PR22 of the embossing EM12 are only adjacent to each other and are not continuous.

Since the contact area with the object to be cleaned or the like can be increased by the two types of embossings EM11 and EM12 formed in this way, the hardness of the toilet cleaner 100 is moderated and the wiping performance is increased.

That is, by combining and forming embossing (EM11) in which the bulging part (PR21) is a curved surface and embossing (EM12) in which the bulging part (PR22) is a flat surface is formed on the entire surface of the seat of the toilet cleaner 100 in combination At the time when force is applied to the toilet cleaner 100, each emboss is deformed and the contact area is increased for the first time, so while increasing the contact area, due to the deformation of each emboss, the softness is also improved.

For example, as shown in FIG. 3A, in the case of a single embossing EM11, the contact area caused by deformation of the embossing EM11 by the force applied to the toilet cleaner 100 during wiping work ( CN31) is discretely generated in the vicinity of the embossment (EM11). On the other hand, when two types of embossing (EM11 and EM12) are combined, as shown in Fig. 3B, the force applied to the toilet cleaner 100 during wiping work causes the embossing (EM11 and EM12) to It can be seen that the contact area CN32 resulting from deformation is increased compared to the contact area CN31 of FIG. 3A.

In addition, two types of embossing (EM11 and EM12) can obtain the same effect of ordinary embossing, and can improve the texture, water absorption, bulkiness, etc. of a toilet cleaner. In addition, continuous embossing (EM21) can also obtain the good-looking effect by embossing similarly to normal embossing.

[Method of Manufacturing Toilet Cleaner 100]

Next, the manufacturing method of the toilet cleaner 100 is demonstrated.

4 is a flowchart showing a manufacturing method of the toilet cleaner 100. As shown in FIG. Fig. 5 is a schematic diagram of a solution application facility for applying a binder solution containing a water-soluble binder to the base paper sheet of the toilet cleaner 100. FIG. 6 is a schematic diagram of processing facilities for processing base paper sheets to which a binder solution has been applied in the solution application facility shown in FIG. 5 .

In the manufacturing method of the toilet cleaner 100, as shown in FIG. 4, the papermaking process (S1) which first makes the paper which becomes base paper with a papermaking machine (not shown) is implemented.

Subsequently, as shown in Figs. 4 and 5, in the solution application facility, continuous drying continuously discharged from a plurality (for example, two) of primary fabric rolls 1, 1 wound around the prepared base paper. A ply processing step (S2) of ply processing the base papers 1A and 1A to form a continuous ply sheet 1B, and a solution applying step of applying a binder solution to the continuous ply sheet 1B to form a continuous sheet 1C ( S3), a drying step of drying the continuous sheet 1C (S4), and a slit/winding step of slitting and winding the dried continuous water-decomposable sheet 1D (S5) are performed. In addition, if there are two or more primary fabric rolls, the number can be changed appropriately, but in the following description, an example in the case of using two will be described.

Next, as shown in FIGS. 4 and 6 , in the processing facility, the continuous water-decomposable sheet 1D continuously discharged from the secondary fabric roll 11 wound up in the slit/winding step (S5) is embossed. An embossing process (S6) for processing and a finishing process (S7) for performing finishing on the embossed sheet 1E subjected to the embossing are performed. In addition, the detail of each process is mentioned later.

[Papermaking process]

The papermaking process related to the present invention will be described. In the papermaking process of the present invention, the papermaking raw material is made into a base paper sheet by, for example, a known wet papermaking technique. That is, after the papermaking raw material is made into a wet paper state, it is dried with a dryer or the like to form base paper sheets such as thin paper and crepe paper.

As the raw material of the base paper sheet, known virgin pulp, old paper pulp, etc. can be used, for example, and contain at least pulp fibers. The pulp used as this raw material is preferably a mixture of LBKP and NBKP in an appropriate ratio. In addition, as fibers other than pulp fibers, rayon fibers, synthetic fibers, and the like may be contained.

Further, the base paper sheet of the present invention contains an anionic acrylamide-based polymer (hereinafter referred to as "anionic PAM") as a coagulant. Anionic PAM is a polymer obtained by copolymerizing an acrylamide-based monomer and an anionic monomer.

As an acrylamide type monomer, it is a mixture of acrylamide alone, acrylamide, and the following acrylamide and nonionic monomers copolymerizable with the following acrylamide. As nonionic monomers copolymerizable with acrylamide, methacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-isopropylacrylamide, N-isopropylacrylamide, N-hydroxy Examples include ethyl acrylamide, diacetone acrylamide, acryloylmorpholine, N-acryloylpyrrolidine, N-acryloylpiperidine, N-vinylloridone, N-vinylformamide, and N-vinylacetamide. do. These may be used independently or may use 2 or more types together.

Examples of the anionic monomer include acrylic acid, methacrylic acid, acrylamide-2-methylpropanesulfonic acid, itaconic acid, maleic acid, fumaric acid, and neutralized salts thereof.

Further, as long as the water solubility of the anionic PAM is not impaired, monomers such as styrene, acrylonitrile, and (meth)acrylic acid ester may be incorporated.

The addition amount of anionic PAM is preferably about 10 to 1000 ppm. By making paper using such a pulp and copper-charged anionic flocculant, cohesion of the base paper sheet can be reduced, and decomposability in water can be improved by capillarity.

In addition to the above-mentioned pulp and flocculant, papermaking chemicals such as wet strength agents, adhesives, and release agents may be appropriately used for the base paper sheet.

[continuous drying base paper]

As the physical properties of the continuously drying base paper 1A, the weight per unit area is preferably about 15 to 75 gsm. Further, the weight per unit area of the ply-processed water-soluble binder-containing sheet (continuous water-decomposable sheet 1D) is about 30 to 150 gsm. In addition, the weight per unit area is based on JIS P 8124.

The continuously drying base paper 1A goes through a ply processing step (S2), a solution application step (S3), a drying step (S4), and a slit/winding step (S5) to be described later to become a ply-processed water paper, and It is processed into the toilet cleaner 100 through an embossing process (S6) and a finishing process (S7) described later.

[Fly Processing Process]

Next, the ply processing step (S2) of the present embodiment will be described. In the ply processing step (S2), as shown in FIG. 5 , each continuously drying base paper 1A, 1A continuously fed out from the primary fabric roll 1 is ply processed along the continuous direction, and the ply continuous sheet It is supplied to the overlapping part 2 made into (1B). The overlapping portion 2 is composed of a pair of rolls, and plies process each of the continuously drying base papers 1A and 1A to form a ply-processed continuous ply sheet 1B. Further, when the continuously drying base papers 1A, 1A are overlapped, they may be lightly fixed by pin embossing (contact embossing) so that the continuous drying base papers 1A, 1A do not shift easily.

[binder solution]

Next, a binder solution is demonstrated. The binder solution contains carboxymethylcellulose (CMC) as a water-soluble binder. The concentration of carboxymethylcellulose in the binder solution is 1 to 30% by weight, preferably 1% by weight or more and less than 4% by weight.

On the other hand, for CMC, the degree of etherification is preferably from 0.6 to 2.0, particularly from 0.9 to 1.8, more preferably from 1.0 to 1.5. Decomposability in water and expression of wet intelligence become very good.

Moreover, as CMC, a water-swelling thing can be used. This exhibits a function of binding the fibers constituting the sheet while remaining unswollen due to crosslinking of specific metal ions in the chemical solution, and can develop strength as a wiping sheet capable of withstanding cleaning and wiping operations.

Examples of components other than carboxymethylcellulose in the binder solution include polyvinyl alcohol, starch or derivatives thereof, hydroxypropylcellulose, sodium alginate, tragacanth gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, Casein, albumin, furfuran, polyethylene oxide, viscose, polyvinyl ethyl ether, sodium polyacrylate, sodium polymethacrylate, polyacrylamide, hydroxylated derivatives of polyacrylic acid, polyvinylpyrrolidone/vinylpyrrolidonevinyl acetate Binder components, such as a copolymer, are mentioned.

It is preferable to use a water-soluble binder having a carboxyl group from the viewpoint that decomposability in water is good and wet strength can be expressed by a crosslinking reaction.

A water-soluble binder having a carboxyl group is an anionic water-soluble binder that easily produces a carboxylate in water. Examples include polysaccharide derivatives, synthetic polymers, and natural products. Examples of polysaccharide derivatives include salts of carboxymethyl cellulose, carboxyethyl cellulose or salts thereof, carboxymethylated starch and salts thereof, and alkali metal salts of carboxymethyl cellulose are particularly preferred.

Examples of synthetic polymers include salts of polymers or copolymers of unsaturated carboxylic acids, salts of copolymers of unsaturated carboxylic acids and monomers copolymerizable with the unsaturated carboxylic acids, and the like. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid. As a monomer copolymerizable with these, the ester of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, vinyl ether, etc. are mentioned. Particularly preferred synthetic polymers are those using acrylic acid or methacrylic acid as the unsaturated carboxylic acid, specifically, polyacrylic acid, polymethacrylic acid, a salt of an acrylic acid-methacrylic acid copolymer, acrylic acid or methacrylic acid, and an alkyl acrylate or methacrylic acid. and salts of copolymers of alkyl acids. As a natural product, sodium alginate, xanthan gum, gellan gum, tragacanth gum, pectin, etc. are mentioned.

[Solution application step]

Next, the solution application step (S3) of the present embodiment is described. In the solution application step (S3), as shown in Fig. 5, both outer surfaces of the continuous ply sheet 1B (when the continuously drying base papers 1A and 1A are ply-processed, the continuously drying base papers 1A and 1A face each other) surface) is sprayed with the above-described binder solution by each of the spray nozzles 3 and 3 of the two-fluid system. In this way, the water-soluble binder contained in the binder solution can be added to the ply continuous sheet 1B.

In addition, as a spraying method of the binder solution, for example, the outer surface of each sheet of the continuous drying base paper 1A, 1A continuously discharged from the above-mentioned primary fabric rolls 1, 1 (the surface on which each sheet is not facing) ), a sheet equivalent to the continuous sheet 1C described above is generated by spraying the above-described binder solution from each spray nozzle of the two-fluid system and fly-processing the continuous dry base papers 1A and 1A immediately after. you can do it

The spray nozzle 3 of the two-fluid method is a spray nozzle of a method in which compressed air divided into two systems and a liquid are mixed and sprayed. can be sprayed finely and evenly.

In the case of using a two-fluid type spray nozzle in the present embodiment, a binder solution (viscosity of 400 to 1200 MPa.s) is applied to each outer surface of the ply-processed continuous ply sheet 1B at high pressure (injection pressure of 1.5 MPa or more). is applied, it is easy to impregnate the binder solution in the thickness direction of the sheet.

On the other hand, in the case of using a spray nozzle of the one-fluid method in the present embodiment, a binder solution (viscosity of 400 to 1200 MPa.s) is applied to each outer surface of the ply-processed continuous ply sheet 1B at a spraying pressure of 1.5 MPa or less. By doing so, it is easy to impregnate the sheet with the binder solution in the thickness direction, and it is easy to uniformly apply the binder solution to the surface of the sheet.

[Drying process]

Next, the drying process (S4) of this embodiment is demonstrated. In the drying step (S4), as shown in FIG. 5, in the drying facility 4, the insoluble liquid content in the binder solution of the continuous sheet 1C described above is evaporated to remove the active ingredient, particularly CMC, from the fibers. Settle down.

Here, since the permeation amount of the binder solution decreases from the outer surface (front surface and back surface) of the continuous sheet 1C toward the inside in the thickness direction, the fixing amount of CMC decreases toward the inside in the thickness direction. do. Therefore, when the chemical solution is impregnated in the finishing processing step (S7) described later, the crosslinking reaction is less likely to occur toward the inner side in the thickness direction and has many voids, so that the inside of the sheet is covered with the chemical solution can do. Thereby, it can make it difficult to dry the toilet cleaner 100 obtained. Moreover, since a lot of CMC crosslinking reactions occur in the vicinity of the outer surface of the continuous sheet 1C, the surface strength of the toilet cleaner 100 obtained can be made firm.

As the drying facility 4, a dryer facility with a hood that blows hot air to the continuous sheet 1C to dry it can be used. In addition, in order to bring the sheets closer together, a press roll or a turn roll may be provided, and the continuous sheet 1C may be passed through the press roll or the turn roll before the drying step (S4).

Moreover, you may use the facility by infrared irradiation as said drying facility. In this case, a plurality of infrared irradiation units are arranged in parallel in the conveying direction of the continuous sheet 1C, and the conveyed continuous sheet 1C is irradiated with infrared rays to dry. Since moisture is heated by infrared rays and dried, uniform drying is possible compared to dryers using hot air, and generation of wrinkles in the subsequent slit/winding process can be prevented.

[Slit/winding process]

Next, the slit/winding process (S5) of this embodiment is demonstrated. In the slit/winding step (S5), the continuous water-decomposable sheet 1D subjected to ply processing is dried in the above-described drying step (S4) to fix the CMC in order to be used as a raw material for processing with an off-line processing machine. The continuous water-decomposable sheet 1D thus formed is slit into a predetermined width by the slitter 5 while adjusting the tension, and wound up in the winder equipment 6. The winding speed is appropriately determined in consideration of the ply processing step (S2), the solution application step (S3), and the drying step (S4). If it is too fast, the sheet will be broken, and if it is too slow, wrinkles will occur, so be aware of this.

In the slit/winding step (S5), the continuous water-decomposable sheet 1D subjected to ply processing is crimped, thereby further integrating the continuous water-decomposable sheet 1D into a single sheet.

[embossing process]

Next, the embossing process (S6) of the present embodiment will be described. In the embossing process (S6), as shown in FIG. 6 , the entire surface of the sheet is embossed with the embossing roll 12 for the continuous water-decomposable sheet 1D continuously fed out from the secondary fabric roll 11. Embossing to form a predetermined shape is performed. This embossing process is performed for the purpose of enhancing design properties while enhancing strength, bulkiness, wiping properties, and the like of the sheet.

[Finishing process]

Next, the finishing process (S7) of the present embodiment will be described. In the finishing processing step (S7), as shown in FIG. 6 , in the finishing processing facility 13, the cutting of the embossed sheet 1E, the folding of each cut sheet, and the folding of each sheet are performed. Impregnation of the above-mentioned chemical solution and packaging of each sheet impregnated with the said chemical solution are carried out in a series flow. Here, as the crosslinking agent contained in the chemical liquid, when CMC is used as a water-soluble binder, it is preferable to use a polyvalent metal ion. In particular, the use of one or two or more polyvalent metal ions selected from the group consisting of alkaline earth metal, manganese, zinc, cobalt, and nickel provides sufficient bonding between fibers to develop wet strength that can withstand use, and It is preferable in terms of sufficient decomposability in water. Among these metal ions, it is particularly preferable to use ions of calcium, strontium, barium, zinc, cobalt, and nickel.

By passing through each of the above steps, the toilet cleaner 100 is manufactured.

As described above, according to the present embodiment, the blending ratio of the softwood bleached kraft pulp to the broadleaved tree bleached kraft pulp is less than 1/1, and the blending ratio of the broadleaved tree bleached kraft pulp is increased compared to the softwood bleached kraft pulp, thereby increasing the gap between the fibers. , it is possible to suppress the evaporation of water in the chemical solution. In addition, since 1 to 20% by weight of a trihydric or higher polyhydric alcohol is impregnated with respect to the weight of the base paper sheet, the sheet can be made viscous and the evaporation of water in the chemical solution can be further suppressed.

In addition, since the base paper sheet (continuous sheet 1C) is in a state in which the content of CMC is increased from the inner side in the thickness direction of the base paper sheet toward the front and back sides, when the base paper sheet is impregnated with a chemical solution containing a crosslinking agent , Since the crosslinking reaction is less likely to occur and has many voids as it goes toward the inside in the thickness direction, the chemical solution can be shielded inside the sheet. Thereby, it can make it difficult to dry the toilet cleaner 100 obtained. In addition, since a large amount of crosslinking reaction of CMC occurs in the vicinity of the outer surface of the base paper sheet, the surface strength of the toilet cleaner 100 obtained can be made strong.

As mentioned above, although this invention has been concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It is changeable in the range which does not deviate from the summary.

In the description of the embodiments of the present invention, embossing (EM11) in which the bulging portion (PR21) has a curved shape and embossing (EM12) in which the bulging portion (PR22) has a flat shape are exemplified, However, it is not necessarily limited to this shape, and for example, the bulging part of embossing (EM11) and embossing (EM12) may be a flat shape with a different height. Moreover, for example, the bulging part of embossing (EM11) may have a flat shape, and the bulging part of embossing (EM12) may have a curved shape.

In other words, if the shape of the bulging part is two types of embossing (first embossing and second embossing) that are not the same shape, and the second embossing is arranged around the first embossing, each embossing bulge The shape of the part may be anything.

In the description of the embodiment of the present invention, etc., the bulging portion is disposed between the flat embossing (EM12) and the curved embossing (EM11), but the embossing (EM11) intersects each other. It can be done.

In addition, in the description of the embodiment of the present invention, all the embossments EM11 and EM12 are convex in the drawing front direction in FIG. 1, but the embossments EM11 and EM12 convex in the drawing front direction and the drawing Concave embossments EM11 and EM12 may be arranged alternately in the forward direction.

For example, as shown in FIG. 7 , convex embossments EM11 and EM12 (solid line portion) shown in FIG. 7 and concave embossments EM11 and EM12 (broken line portion) shown in FIG. ) are alternately arranged, it is possible to provide household thin paper having high wiping performance on either side of the toilet cleaner 100 while increasing the surface strength of the thin paper for home use by embossing.

In addition, in the description of the embodiment of the present invention, the bulging part (PR21) of the embossing (EM11) and the bulging part (PR22) of the embossing (EM12) are brought into close contact, thereby forming a continuous embossing (EM21). Although formed, the bulging part PR21 of the embossing EM11 and the bulging part PR22 of the embossing EM12 may only come close to each other and not adhere to each other.

Further, in the description of the embodiment of the present invention, a circular or elliptical shape is exemplified as the shape of the embossing (EM11), but the shape of the embossing may be any shape such as a quadrangle or a polygon.

Moreover, it is preferable that heights HT21 and HT22 of the bulging part of embossing EM11 and EM12 in FIG. 2 are 0.40 mm - 0.75 mm, for example. Further, for example, the surface is 3D measured with a digital microscope manufactured by Keyence Corporation, and the heights HT21 and HT22 of the bulges of the embossed portions (EM11 and EM12) are measured.

For example, if the height is less than 0.40 mm, friction during wiping becomes strong and wiping is difficult, and if the height exceeds 0.75 mm, the shape of the embossing (EM11 and EM12) tends to collapse during packaging. , the appearance deteriorates.

Moreover, an emboss pattern is not limited to the pattern mentioned above, The emboss pattern as shown to FIGS. 8-10 may be sufficient. As shown in FIGS. 8-10, the concave part e2 has the shape which reversed the convex part e1. The convex portions e1 and the concave portions e2 are alternately arranged in one line, and the convex portions e1 and the concave portions e2 in adjacent columns are arranged in multiple rows so that they are offset from each other by half pitch. forming an embossed pattern. In this way, since the convex portions e1 and the concave portions e2 are alternately formed in both the longitudinal and lateral directions, the convex portions and concave portions are lined up in a row to avoid contamination compared to the emboss pattern. smell can be improved. In addition, the shape of the convex part e1 and the concave part e2 is not specifically limited, A circular shape, an elliptical shape, a polygonal shape, etc. are used. It is good also as what combined each shape.

INDUSTRIAL APPLICABILITY The present invention can be suitably used in the field of producing a water-decomposable sheet.

100: toilet cleaner
1: 1st fabric roll
1A: continuous dry base paper
1B: Ply continuous sheet
1C: continuous sheet
1D: continuous water decomposable sheet
1E: Embossed finished sheet
2: overlapping part
3 : Spray nozzle
4: 1st drying facility
5 : slitter
6: Winder equipment
11: 2nd fabric roll
12 : emboss roll
13: finishing processing facility
EM11 : Emboss
EM12 : Emboss
EM13 : Emboss
PR21: Expansion
PR22: Expansion

Claims (8)

A water-decomposable sheet in which a base paper sheet to which a water-soluble binder is added is impregnated with a chemical solution,
The base paper sheet,
A plurality of base papers are ply processed, and the weight per unit area is 30 to 150 gsm,
The blending ratio of softwood pulp to broadleaf pulp is less than 1/1,
The chemical solution contains a cross-linking agent that causes a cross-linking reaction with the water-soluble binder, and a trihydric or higher polyhydric alcohol;
A water-decomposable sheet characterized in that it is impregnated with the trihydric or higher polyhydric alcohol in an amount of 1 to 20% by weight based on the weight of the base paper sheet. A water-decomposable sheet in which a base paper sheet to which a water-soluble binder is added is impregnated with a chemical solution,
The base paper sheet,
A plurality of base papers are ply processed, and the weight per unit area is 30 to 150 gsm,
The blending ratio of softwood pulp to broadleaf pulp is less than 2/3,
The chemical solution includes a cross-linking agent that causes a cross-linking reaction with the water-soluble binder;
A water-decomposable sheet characterized by impregnating 150 to 300% by weight of the chemical with respect to the weight of the base paper sheet. According to claim 1 or 2,
The water-decomposable sheet according to claim 1, wherein the water-decomposable sheet is in a state in which the content of the water-soluble binder is increased from the inner side in the thickness direction of the base paper sheet toward the front and back surfaces. According to claim 1 or 2,
A water-decomposable sheet characterized in that an emboss is formed on the entire surface. According to claim 4,
The emboss,
A first emboss;
A water-decomposable sheet characterized in that it has a second emboss disposed around the first emboss and having a different shape of the bulge from the first emboss. According to claim 5,
A water-decomposable sheet, characterized in that the first embossments are arranged in a rhombic grid. According to claim 5,
The water-decomposable sheet, characterized in that the second emboss is arranged between the two first embosses. According to claim 5,
A water-decomposable sheet characterized in that the first embossment and the second embossment contact each other to form a continuous embossment.

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