JP6745669B2 - Household thin paper manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing household thin paper.

At present, household thin papers such as toilet cleaners and kitchen cleaners are generally made by plying multiple base papers such as crepe paper into a single sheet in order to improve texture, absorbency and bulkiness. Is used for. Embossing is applied in order to enhance the surface strength and bulkiness of such household thin paper.

For example, by providing an opening pattern net and an opening pattern structure on a conveyor belt (a part for sucking water) in a papermaking process, and patterning unevenness in a pattern applying step by applying a specific amount of heat. , A method for producing bulky paper having high bulkiness and absorbability is disclosed (for example, refer to Patent Document 1).
Further, a method for producing a high-bulk tissue paper web is disclosed by providing a concavo-convex belt in the pressing step (press felt) of a crepe tissue papermaking machine and imparting concavities and convexities simultaneously with dehydration (for example, See Patent Document 2).

By the way, in a product that wraps a plurality of household thin paper sheets (in a laminated state), in order to stabilize the quality, after the ply-processed base paper is embossed, the web height is kept constant with a press belt. Need to be packaged.

Japanese Patent No. 3461122 Japanese Patent No. 5504169

However, in the packaging method in which the web height is kept constant with the pressing belt, the emboss applied to the household thin paper is crushed by the pressing by the pressing belt, so that the bulkiness as designed cannot be obtained. is there.
Both of the techniques described in Patent Document 1 and Patent Document 2 described above are techniques for securing bulkiness by imparting a concavo-convex pattern (embossing) at the same time as suction of moisture in the suction part of papermaking, and therefore, household thin paper. It did not solve the above problems in the packaging process.

It is an object of the present invention to provide a method for producing household thin paper, which is capable of ensuring the bulkiness of the household thin paper and preventing deterioration of the wiping property.

The invention according to claim 1 is made to achieve the above object,
In the production method of household thin paper,
An embossing process for forming embossing on household thin paper;
After pressing the household thin paper on which the emboss is formed to a constant height by a pressing belt on which an uneven pattern based on the shape of the emboss is formed on the contact surface with the household thin paper on which the emboss is formed A packaging process for packaging the household paper of a certain height,
It is characterized by having.

The invention according to claim 2 is the method for producing the household thin paper according to claim 1,
And a chemical solution impregnating step of impregnating the thin paper for household use on which the emboss is formed with a chemical solution,
In the packaging step, the household thin paper impregnated with the chemical solution is pressed by the pressing belt to make the height constant, and then the household thin paper having the constant height is packaged.

The invention according to claim 3 is the method for producing the household thin paper according to claim 1 or 2,
The pressing belt is characterized in that a convex portion based on the shape of the emboss is formed on a contact surface with the household thin paper.

According to a fourth aspect of the present invention, in the method for manufacturing household thin paper according to the third aspect,
The convex portions are formed in a spot shape and arranged at a predetermined pitch.

The invention according to claim 5 is the method for producing the household thin paper according to claim 4,
The convex portion is characterized in that a concave portion is formed at a tip portion thereof.

ADVANTAGE OF THE INVENTION According to this invention, the bulkiness of household thin paper can be ensured and deterioration of wipeability can be prevented.

It is a top view showing an example of household thin paper concerning this embodiment. It is a flowchart which shows the manufacturing method of the household thin paper which concerns on this embodiment. It is a schematic diagram which shows an example of the manufacturing equipment (solution application equipment) of the household thin paper which concerns on this embodiment. It is a schematic diagram which shows an example of the manufacturing equipment (processing equipment) of the household thin paper which concerns on this embodiment. It is a side view which shows the whole structure of a pressing belt. It is a perspective view which shows the structure of a pressing belt, and a side surface sectional view in the E1-E1 line. FIG. 3 is a side sectional view showing an example of an upper holding belt and a topmost household thin paper when a household thin paper laminate is conveyed. 9A and 9B are a perspective view and a side cross-sectional view taken along line E2-E2 of the pressing belt according to Modification 1. 9A and 9B are a perspective view and a side cross-sectional view taken along line E3-E3 showing the configuration of the pressing belt according to Modification 2. 9A and 9B are a perspective view and a side cross-sectional view taken along line E4-E4 showing the configuration of the pressing belt according to Modification 3. FIG. 9 is a perspective view showing a configuration of a pressing belt according to Modification 4 and a side sectional view taken along line E5-E5.

Hereinafter, with reference to the drawings, a household thin paper which is an embodiment of the present invention will be described in detail. However, the scope of the invention is not limited to the illustrated example.

In the present embodiment, a toilet cleaner 100 will be described as an example of household thin paper manufactured according to the present invention. Note that the household thin paper of the present invention includes wet tissues impregnated with water or a chemical liquid for wiping purposes other than toilet cleaners, and kitchen papers and tissue papers for dry wiping purposes. Further, the short side direction of the toilet cleaner 100 will be described as the X direction, and the long side direction of the toilet cleaner 100 will be described as the Y direction.

The X direction of the toilet cleaner 100 is the direction (machine direction (MD direction): machine direction) of the paper on the paper machine, and the Y direction of the toilet cleaner 100 is the width of the paper machine (flow direction). At right angles to the direction (cross machine direction (CD direction), cross machine direction).

[Structure of toilet cleaner 100]
The toilet cleaner 100 manufactured according to the present embodiment is obtained by plying (laminating) a plurality of base papers, and a predetermined chemical solution is applied thereto. Further, as shown in FIG. 1, a circular emboss EM1 is applied to the entire surface of the toilet cleaner 100 sheet by embossing. In this embodiment, the embossed EM1 is formed on the entire surface of the toilet cleaner 100, but the present invention is not limited to this, and the embossed EM1 is formed on a part of the toilet cleaner 100 sheet. It may be.

Further, the toilet cleaner 100 is folded, so that the toilet cleaner 100 is folded in two at the center in the longitudinal direction (Y direction), for example. Then, it is stored in a folded plastic case, a packaging film, or the like in a folded state, and when used, it is unfolded and used. The toilet cleaner 100 is not limited to be folded in two, but may be folded in four or eight.

In addition, the toilet cleaner 100 of the present embodiment is composed of a water-decomposable fiber assembly so that the toilet cleaner can be discarded as it is in the water pool of the toilet after cleaning the toilet.

As the fiber assembly, natural fibers, synthetic fibers, fibers obtained by mixing these, or the like can be used, and there is no particular limitation as long as they are water-decomposable fiber assemblies. Suitable raw fibers include wood pulp, non-wood pulp, cellulosic fibers such as rayon and cotton, and biodegradable fibers such as polylactic acid. Further, in order to improve the strength of the base material, polyvinyl alcohol (PVA), carboxymethyl cellulose (CMC) or the like may be blended or coated/applied as a water-soluble binder.

Further, the toilet cleaner 100 of the present embodiment is coated with a predetermined chemical liquid, and specifically, in addition to an aqueous cleaning agent, an auxiliary agent such as a fragrance, an antiseptic agent, a disinfectant agent, and a paper strength agent is added. A prescribed chemical liquid containing is applied.

As the chemical liquid, an appropriate one can be used. For example, as the aqueous detergent, a surfactant or a lower or higher (aliphatic) alcohol can be used. As the fragrance, one or more kinds can be appropriately selected and used from oil-based fragrances such as orange oil in addition to the water-based fragrance. As the preservative, for example, parabens such as methylparaben, ethylparaben and propylparaben can be used. As the disinfectant, alcohol, paraoxybenzoic acid ester, quaternary ammonium salt of monomer, cetylpyridinium chloride, phenoxyethanol and the like can be used. As the paper strengthening agent, boric acid, various metal ions and the like can be used.

In addition, the auxiliary agent of the above-mentioned component of the drug solution can be appropriately selected, and the drug solution may contain a component that fulfills another function, if necessary.

[Method of manufacturing toilet cleaner 100]
Next, a method for manufacturing the toilet cleaner 100 will be described with reference to FIGS.
In the manufacturing method of the toilet cleaner 100, as shown in FIG. 2, first, a papermaking step (S1) of making a paper as a base paper by a papermaking machine (not shown) is performed.

Next, as shown in FIG. 2 and FIG. 3, in the solution application equipment, continuous dry base paper 1A, which is respectively fed from a plurality of (for example, two) primary web rolls 1 and 1 wound with the paper that has been made into paper, A ply processing step (S2) of ply-processing 1A into a continuous ply sheet 1B, a solution applying step (S3) of applying a binder solution to the continuous ply sheet 1B to form a continuous sheet 1C, and drying the continuous sheet 1C. The drying step (S4) and the slit/winding step (S5) for slitting and winding the dried continuous water-decomposable sheet 1D are performed. The number of primary rolls can be changed as appropriate as long as there are two or more rolls, but in the following description, an example in which two rolls are used will be described.

Next, as shown in FIGS. 2 and 4, in a processing facility, embossing is performed on the continuous water-disintegratable sheet 1D fed from the secondary original fabric roll 11 wound in the slit/winding step (S5). An embossing process (S6) and a finishing process (S7) of finishing the embossed sheet 1E that has been embossed.

[Papermaking process]
In the papermaking step (S1) of the present invention, for example, a known wet papermaking technique is used to make a papermaking raw material to form a base paper sheet. That is, after the papermaking raw material is in a wet paper state, it is dried by a dryer or the like to form a base paper sheet such as thin paper or crepe paper.

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

Further, the base paper sheet of the present invention contains an anionic acrylamide polymer (hereinafter referred to as "anionic PAM") as a coagulant. Anionic PAM is a polymer obtained by copolymerizing an acrylamide monomer and an anionic monomer.
The acrylamide-based monomer is acrylamide alone or a mixture of acrylamide and a nonionic monomer copolymerizable with acrylamide as described below. Examples of nonionic monomers copolymerizable with acrylamide include methacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, N-isopropylacrylamide, N-isopropylacrylamide, N-hydroxyethylacrylamide and diacetone. Examples thereof include acrylamide, acryloylmorpholine, N-acryloylpyrrolidine, N-acryloylpiperidine, N-vinylrollidone, N-vinylformamide and N-vinylacetamide. These may be used alone or in combination of two or more.
Examples of the anionic monomer include acrylic acid, methacrylic acid, acrylamido-2-methylpropanesulfonic acid, itaconic acid, maleic acid, fumaric acid, and neutralized salts thereof.
A monomer such as styrene, acrylonitrile, or (meth)acrylic acid ester may be blended as long as the water solubility of the anionic PAM is not impaired.
The addition amount of the anionic PAM is preferably about 10 to 1000 ppm. By making a paper using such an anionic flocculant having the same charge as the pulp, the coagulation of the base paper sheet can be reduced and the water decomposability can be improved by the capillary phenomenon.

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

In the present embodiment, in the paper making step, adjustment is performed so that the fiber orientation ratio (length/width) of the base paper sheet is 0.8 to 2.0, preferably 1.0. The fiber orientation can be adjusted, for example, in a paper machine by adjusting the angle at which the papermaking raw material is supplied to the wire part. The angle at which the papermaking raw material is supplied can be adjusted, for example, by adjusting the slice opening degree of the head box. Alternatively, the fiber orientation may be adjusted by applying vibration in a direction orthogonal to the conveyance direction (traveling direction) of the paper machine.

[Continuous dry base paper]
As a physical property of the continuously dried base paper 1A, the basis weight is preferably about 15 to 75 gsm. The basis weight of the ply-processed sheet containing the water-soluble binder (continuous water-decomposable sheet 1D) is about 30 to 150 gsm. The basis weight is based on JIS P 8124.
The continuously dried base paper 1A becomes a ply-processed hydrolyzed paper through a ply processing step (S2), a solution applying step (S3), a drying step (S4), and a slit/winding step (S5) described later, and further described later. The toilet cleaner 100 is processed through an embossing process (S6) and a finishing process (S7).

[Ply processing step]
Next, in the ply processing step (S2), as shown in FIG. 3, the continuous dry base papers 1A and 1A continuously fed from the raw roll 1 are ply processed in the continuous direction to form a ply continuous sheet 1B. Is supplied to the superposing section 2. The superposing section 2 is composed of a pair of rolls, plies the respective continuous base papers 1A and 1A, and forms a ply continuous sheet 1B. In addition, when the continuous dry base papers 1A and 1A are overlapped with each other, the continuous dry base papers 1A and 1A may be lightly fastened by pin embossing (contact embossing) so that the continuous dry base papers 1A and 1A do not easily slip.

[Binder solution]
The binder solution contains carboxymethyl cellulose (CMC) as a water-soluble binder. The concentration of carboxymethyl cellulose 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, it is desirable that the degree of etherification of CMC is 0.6 to 2.0, particularly 0.9 to 1.8, and more preferably 1.0 to 1.5. The water-decomposability and wet paper strength are extremely improved.

Moreover, as CMC, a water-swellable one can be used. This exerts a function of holding fibers constituting the sheet in an unswelled state by cross-linking a specific metal ion in the chemical liquid, and can exert strength as a wiping sheet that can endure cleaning and wiping operations.

As the components other than carboxymethyl cellulose in the binder solution, polyvinyl alcohol, starch or a derivative thereof, hydroxypropyl cellulose, sodium alginate, tran gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, pullplan, poly Examples thereof include binder components such as ethylene oxide, viscose, polyvinyl ethyl ether, sodium polyacrylate, sodium polymethacrylate, polyacrylamide, hydroxylated derivatives of polyacrylic acid, and polyvinylpyrrolidone/vinylpyrrolidone vinyl acetate copolymer.

It is preferable to use a water-soluble binder having a carboxyl group from the viewpoint of good water decomposability and development of wet strength by a crosslinking reaction.
The water-soluble binder having a carboxyl group is an anionic water-soluble binder that easily forms a carboxylate in water. Examples thereof include polysaccharide derivatives, synthetic polymers and natural products. Examples of the polysaccharide derivative include a carboxymethyl cellulose salt, carboxyethyl cellulose or a salt thereof, carboxymethylated denbun or a salt thereof, and an alkali metal salt of carboxymethyl cellulose is particularly preferable.

Examples of the synthetic polymer 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. Examples of monomers copolymerizable with them include esters of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, vinyl ether and the like. A particularly preferred synthetic polymer is one using acrylic acid or methacrylic acid as the unsaturated carboxylic acid, and specifically, polyacrylic acid, polymethacrylic acid, a salt of acrylic acid-methacrylic acid copolymer, acrylic acid or methacrylic acid. Examples thereof include salts of a copolymer of an acid and an alkyl acrylate or an alkyl methacrylate. Examples of natural products include sodium alginate, xanthan gum, gellan gum, taragant gum, pectin and the like.

[Solution application step]
Next, in the solution applying step (S3), as shown in FIG. 3, the ply continuous sheet 1B is applied to both outer surfaces (the surfaces where the continuous dry base papers 1A and 1A do not face each other when the continuous dry base papers 1A and 1A are ply processed). The above-mentioned binder solution is sprayed from each of the two-fluid spray nozzles 3 to produce the continuous sheet 1C.
As a method of spraying the binder solution, the above binder solution may be sprayed on one outer surface of the continuous ply sheet 1B.

The two-fluid spray nozzle 3 is a spray nozzle that mixes compressed air and liquid divided into two systems and ejects the compressed air. Compared to the one-fluid spray nozzle that ejects the compressed liquid independently, The liquid can be sprayed finely and uniformly.
When the two-fluid type spray nozzle is used in the present embodiment, the binder solution (viscosity 400 to 1200 MPa.s) is applied to each outer surface of the ply continuous sheet 1B with high pressure (jet pressure of 1.5 MPa or more). Since it is applied, it is easy to impregnate the binder solution in the thickness direction of the sheet.
On the other hand, when the one-fluid type spray nozzle is used in the present embodiment, the binder solution (viscosity 400 to 1200 MPa.s) is applied to the outer surface of each ply continuous sheet 1B having a spray pressure of 1.5 MPa or less. Thus, the binder solution is easily impregnated in the thickness direction of the sheet, and the binder solution is easily applied uniformly on the surface of the sheet.
In this manner, by spraying the binder solution on the outer surface of the continuous ply sheet 1B, the toilet cleaner 100 has the center in the thickness direction (when applied on both surfaces) or the non-applied surface of the binder solution (when applied on one surface). Since the content of the water-soluble binder increases from the direction toward the surface where the binder solution is applied, the surface strength can be improved while ensuring the water decomposability, and the toilet cleaner 100 is less likely to be damaged even when strongly rubbed. Can be manufactured.

[Drying process]
Next, in the drying step (S4), as shown in FIG. 3, in the drying equipment 4, the insoluble liquid component in the binder solution of the continuous sheet 1C described above is evaporated, and the active ingredient, particularly CMC, is added to the fiber. Fix it.
Here, since the amount of the binder solution infiltrated decreases from the outer 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. Therefore, when the chemical solution is impregnated in the finishing step (S7), the cross-linking reaction is less likely to occur toward the inner side in the thickness direction, and since there are many voids, the chemical solution may be trapped inside the sheet. it can. Thereby, the obtained toilet cleaner 100 can be made difficult to dry.
As the drying equipment 4, a hooded dryer equipment that blows hot air onto the continuous sheet 1C to dry it can be used. In order to bring the sheets into closer contact with each other, a press roll or a turn roll may be installed, 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 equipment by infrared irradiation as said drying equipment. In this case, a plurality of infrared irradiation units are arranged in parallel in the transport direction of the continuous sheet 1C, and the transported continuous sheet 1C is irradiated with infrared rays to be dried. Since the infrared rays generate heat and dry the water, uniform drying is possible as compared with a dryer using hot air, and it is possible to prevent wrinkles from being generated in the slit/winding process in the subsequent stage.

[Slit/winding process]
Next, in the slit/winding step (S5), the ply-processed continuous water-disintegratable sheet 1D is dried in the above-described drying step (S4) to be used as a raw material for processing with an offline processing machine. While adjusting the tension of the fixed continuous water-disintegratable sheet 1D, the slitter 5 slits a predetermined width, and the winder equipment 6 winds the slit. The winding speed is appropriately determined in consideration of the ply processing step (S2), the solution applying step (S3), and the drying step (S4). It should be noted that if it is too early, the sheet will break, and if it is too late, wrinkles will occur.
In the slit/winding step (S5), the ply-processed continuous water-disintegratable sheet 1D is pressure-bonded, so that the continuous water-disintegratable sheet 1D is more integrated into one sheet.

[Embossing process]
Next, in the embossing step (S6), as shown in FIG. 4, with respect to the continuous water-degradable sheet 1D fed from the secondary original fabric roll 11, the embossing roll 12 embosses the entire surface of the sheet into a predetermined shape. Processing is applied. This embossing is performed for the purpose of enhancing the design, as well as enhancing the strength, bulkiness, wiping-off property, etc. of the sheet.

[Finishing process]
Next, in the finishing step (S7), as shown in FIG. 4, in the finishing facility 13, the embossed sheet 1E is cut, each cut sheet is folded, and each of the folded sheets is processed as described above. Impregnation of the chemical liquid and packaging of each sheet impregnated with the chemical liquid are performed in a series of flows. Here, when CMC is used as the water-soluble binder, it is preferable to use a polyvalent metal ion as the crosslinking agent contained in the chemical liquid. In particular, it is preferable to use one or more polyvalent metal ions selected from the group consisting of alkaline earth metals, manganese, zinc, cobalt and nickel so that the fibers can be sufficiently bonded and can be used. It is preferable from the viewpoint that strength is exhibited and the water-decomposability is sufficient. Among these metal ions, it is particularly preferable to use calcium, strontium, barium, zinc, cobalt and nickel ions.

In this embodiment, after impregnation with the chemical liquid, a predetermined number of sheets are stacked by a counter (not shown). Then, the laminated body 110 of the sheets is conveyed while being regulated (pressed and pinched) by a pressing belt 14 (see FIG. 5) provided in the finishing facility 13 so as to have a constant height, and a packaging process is performed. That is, the finishing process of the present embodiment includes the packaging process of the present invention.
As shown in FIG. 5, the presser belt 14 includes an upper presser belt 15 and a lower presser belt 16 that rotate in the directions of the arrows. The pressing belt 14 is configured to convey the sheet stack 110 between the pressing belts 15 and 16 to the packaging process.

The pressing belt 14 can maintain the shape of, for example, rubber, silicon, resin (polyester, aramid resin, Teflon (registered trademark), etc., has durability that can withstand high-speed operation, and is a sheet during conveyance. It is made of a material that does not scratch. For the purpose of preventing slippage during transportation, surface treatment may be performed so that the surface is rough like felt. Further, it may be formed (rustproofing) of metal such as stainless steel.

As shown in FIGS. 6(A) and 6(B), the pressing belt 14 (upper pressing belt 15) has a shape of the embossed EM1 on the contact surface with the seat (toilet cleaner 100) on which the embossed EM1 is formed. A convex portion 141, which is an uneven pattern based on the above, is formed. The convex portions 141 project toward the contact surface side with the sheet at a predetermined interval and extend in the direction orthogonal to the transport direction. The lower pressing belt 16 has the same configuration as the upper pressing belt 15 except that the lower pressing belt 15 is disposed in a reversed manner, and thus the description thereof will be omitted.
By forming the convex portion 141 based on the shape of the emboss EM1 on the contact surface of the pressing belt 14 with the sheet, the emboss EM1 of the sheet is accommodated between the convex portions 141 of the pressing belt 14 as illustrated in FIG. Therefore, the shape of the embossed EM1 can be maintained.
In this embodiment, the emboss EM1 is not formed on the fold line formed in the direction orthogonal to the sheet conveying direction. Then, when the sheet is conveyed, by aligning the position of the fold and the position of the upper pressing belt 15 in the width direction, the convex portion 141 of the pressing belt 14 is conveyed so as not to contact the emboss EM1. As a result, the shape of the embossed EM1 can be reliably retained.
The toilet cleaner 100 is manufactured through the above steps.

The shape of the pressing belt 14 is not limited to the example shown in FIG. Hereinafter, modified examples of the pressing belt 14 will be described with reference to FIGS. 8 to 11. 8 to 11 show modified examples of the upper pressing belt 15, the lower pressing belt 16 is also arranged by reversing the upper pressing belt 15 as in the embodiment. Except for the points, it has the same structure as the upper pressing belt 15.

As shown in FIGS. 8A and 8B, the pressing belt 14A (upper pressing belt 15A) according to the first modification has a wider interval between the convex portions 141A than the pressing belt 14 according to the embodiment. Is formed.
According to the configuration of Modification Example 1, it is possible to reduce the ground contact area with the sheet as compared with the pressing belt 14 according to the embodiment, so that contact with the embossed EM1 of the uppermost layer of the sheet stack 110 is suppressed. This makes it possible to improve the maintenance rate of the embossed EM1. Further, it is possible to suppress the exudation of the chemical liquid, and it is possible to improve the retention rate of the chemical liquid.

As shown in FIGS. 9(A) and 9(B), the holding belt 14B (upper holding belt 15B) according to Modification 2 is different from the holding belt 14 according to the embodiment and the holding belt 14A according to Modification 1 in FIG. The difference is that the convex portions 141B do not extend in the direction orthogonal to the transport direction and are formed in a spot shape (dot shape) at a predetermined pitch.
According to the configuration of the second modification, the ground contact area with the seat can be made very small as compared with the pressing belt 14 according to the embodiment and the pressing belt 14A of the first modification. It is possible to further suppress the contact with the uppermost embossed EM1, and it is possible to further improve the maintenance rate of the embossed EM1. Further, it becomes possible to further suppress the exudation of the chemical liquid, and it is possible to further improve the retention ratio of the chemical liquid.

As shown in FIGS. 10(A) and 10(B), the pressing belt 14C (upper pressing belt 15C) according to Modification 3 has a larger convex portion 141C than the pressing belt 14B according to Modification 2. The difference is that a larger number of convex portions 141C are formed.
According to the configuration of Modification 3, as in the configurations of Modifications 1 and 2, compared with the pressing belt 14 according to the embodiment, it is possible to reduce the area of contact with the seat, so that the laminated body 110 of the sheets. It is possible to suppress contact with the uppermost embossed EM1 and improve the maintenance rate of the embossed EM1. Further, it is possible to suppress the exudation of the chemical liquid, and it is possible to improve the retention rate of the chemical liquid.

As shown in FIGS. 11(A) and 11(B), the pressing belt 14D (upper pressing belt 15D) according to Modification 4 has a tip portion of the convex portion 141D that is different from that of the pressing belt 14C according to Modification 3. The difference is that the concave portion 142D is formed.
According to the configuration of Modification 4, the contact area with the sheet can be made smaller than that of the pressing belt 14C according to Modification 3, so that contact with the embossed EM1 of the uppermost layer of the stacked body 110 of the sheets is suppressed. It is possible to improve the maintenance rate of the embossed EM1. Further, it is possible to suppress the exudation of the chemical liquid, and it is possible to improve the retention rate of the chemical liquid.

Next, 1 of the seat (toilet cleaner 100) conveyed by each of the holding belts 14 and 14A to 14D of the present invention and a conventional holding belt (not shown) having a flat plate shape in which the convex portion 14 is not formed. The results of evaluation of the retention rate of the first (uppermost layer) embossed EM1 and the retention rate of the chemical solution will be described using Table 1. Hereinafter, examples using the conventional pressing belt will be described as comparative examples, and examples using the pressing belts 14 and 14A to 14D of the present invention will be described as Examples 1 to 5, respectively.

<Implementation conditions>
・Base paper conditions Base paper: 100% pulp
Weighing (dry state): 90 g/m ²
Number of plies: 2 plies/chemical solution conditions Chemical components: polyhydric alcohol, surfactant, disinfectant, orange extract, silicone/embossing conditions (see Fig. 1): Convex part is 2.5 mm in diameter (h1 in the figure) circle , Grid array
Emboss pitch (h2 in the figure) 7 mm
Distance between adjacent protrusions in a side view (h3 in the figure) 1 mm
-Pressing belt conditions Pressing belt (Example 1): Pitch of convex portion 7 mm
1 mm wide contact area with the sheet Pressing belt (Example 2): Pitch pitch of 14 mm
Contact area with sheet: 1 mm width Pressing belt (Example 3): Convex part is a cone with a flat surface with a diameter of 1 mm formed at the tip.
Convex pitch 14mm
Distance between adjacent protrusions in side view 7mm
Pressing belt (Example 4): convex portion pitch 7 mm
The seat is grounded at a point Pressing belt (Example 5): Pitch pitch 7 mm
The sheet is grounded by a wire with a diameter of 3 mm

<Test method>
Ten sheets impregnated with 170% of the chemical solution are laminated, and the mold of each (upper) pressing belt and the weight for applying a weight are placed on the laminated body 110. The weight is placed so as to be weighted by 50 g. Then, the weight of the weight when the height of the stacked body 110 reaches the target of 50 mm is recorded, and at that time, the appearance (maintenance ratio) of the embossed EM1 in the uppermost layer and the chemical liquid retention ratio are confirmed. The maintenance rate of the embossed EM1 is calculated, for example, based on the ratio of the embossed EM1 completely collapsed into a flat state with respect to the number of embossed EM1 of the entire sheet. Further, the retention rate of the chemical liquid is calculated, for example, based on the weight before and after the uppermost sheet of the laminated body 110 passes through the pressing belt.

As shown in the results shown in Table 1, in Examples 1 to 5, the contact area with the embossing EM1 of the uppermost layer of the sheet was suppressed and the embossing EM1 of the embossing EM1 was suppressed because the contact area between the pressing belt and the sheet was smaller than that of the comparative example. It was found that the maintenance rate improved. It was also found that as the ground contact area is reduced, the exudation of the chemical solution is suppressed, and the retention rate of the chemical solution is improved. That is, as in the present invention, by forming a concavo-convex pattern (convex portion 14 and the like) based on the shape of the embossed EM1 on the contact surface with the sheet (household thin paper) on which the embossed EM1 is formed, It was found that the retention rate of the embossed EM1 and the retention rate of the chemical solution can be improved.

Further, as shown in the results shown in Table 1, in Example 2 (Modification 1: see FIG. 8), the ground contact area between the pressing belt and the seat is smaller than that in Example 1 (Embodiment: see FIG. 6). It was found that the contact with the embossed EM1 of the uppermost layer of the sheet was further suppressed, and the maintenance rate of the embossed EM1 and the chemical solution retention rate were further improved.

Further, as shown in the results shown in Table 1, Example 3 (Modification 2: see FIG. 9) and Example 5 (Modification 4: see FIG. 11) in which the convex portions were formed in a spot shape (dot shape) In comparison with Example 1 (embodiment: see FIG. 6) and Example 2 (embodiment: see FIG. 6) in which the convex portion extends in the direction orthogonal to the transport direction, the pressing belt and the seat are grounded. It was found that since the area becomes smaller, the retention rate of the embossed EM1 and the retention rate of the chemical solution are further improved.

In addition, as in the results shown in Table 1, in Example 4 (Modification 3: see FIG. 10) in which the convex portions were formed in a spot shape (dot shape), the convex portions extended in the direction orthogonal to the transport direction. Compared with the second embodiment (variation 1: see FIG. 8) having the above configuration, the retention rate of the embossed EM1 and the retention rate of the chemical solution are improved even if the contact area between the pressing belt and the sheet is the same. Therefore, it was found that the configuration in which the convex portions are formed in the spot shape (dot shape) is more effective than the configuration in which the convex portions extend in the direction orthogonal to the transport direction.

In the examples, the 2-ply (90 g/m ² ) base paper is used, but the same effect was obtained even when the 3-ply (90 g/m ² ) base paper was used. It was confirmed.

As described above, the method for manufacturing the household thin paper (toilet cleaner 100) according to the present embodiment has the embossing step of forming the embossed EM1 on the household thin paper and the contact surface between the household thin paper on which the embossed EM1 is formed. After pressing the household thin paper on which the embossed EM1 is formed by the pressing belt 14 on which the concavo-convex pattern (convex portion 141) based on the shape of the embossed EM1 is pressed to make the height constant, for household use at a fixed height And a packaging step of packaging thin paper.
Therefore, according to the method for manufacturing a household thin paper according to the present embodiment, the ground contact area between the pressing belt 14 and the household thin paper can be reduced when the household thin paper is conveyed in the packaging process. It is possible to suppress contact with the uppermost embossed EM1 and improve the maintenance rate of the embossed EM1. Therefore, since the bulkiness of the household thin paper can be secured, it is possible to prevent the deterioration of the wiping property caused by the crush of the embossed EM1, and it is possible to secure the quality of the household thin paper.

In addition, the method for manufacturing household thin paper according to the present embodiment has a chemical solution impregnation step of impregnating the household thin paper having the embossed EM1 with a chemical solution. Further, in the packaging step, the household thin paper impregnated with the chemical solution is pressed by the pressing belt 14 to make the height constant, and then the household thin paper having a constant height is packaged.
Therefore, according to the method for manufacturing household thin paper according to the present embodiment, it is possible to reduce the ground contact area between the pressing belt 14 and the household thin paper when the household thin paper is conveyed in the packaging process. Excessive exudation of the chemical solution when pressed and pinched can be suppressed, and the retention rate of the chemical solution can be improved. Therefore, it becomes possible to more reliably ensure the quality of household thin paper.

Further, according to the method for manufacturing household thin paper according to the present embodiment, the pressing belt 14 has the convex portion 141 based on the shape of the emboss EM1 on the contact surface with the household thin paper.
Therefore, according to the method for manufacturing a household thin paper according to the present embodiment, the ground contact area between the pressing belt 14 and the household thin paper can be reduced when the household thin paper is conveyed in the packaging process. The maintenance rate of the uppermost embossed EM1 and the chemical solution retention rate can be improved.

Further, according to the method for manufacturing the household thin paper according to the present embodiment, the convex portions 141B, 141C, 141D are formed in spots and arranged at a predetermined pitch.
Therefore, according to the method for manufacturing a household thin paper according to the present embodiment, even if the pressing belt and the household thin paper have the same ground contact area as compared with the configuration in which the convex portion extends in the direction orthogonal to the transport direction. In terms of shape, it is possible to suppress contact with the embossed EM1 of the uppermost layer of household thin paper and excess exudation of the chemical solution, so that the maintenance rate of the uppermost embossed EM1 of household thin paper and the retention rate of the chemical solution can be reduced. It can be further improved.

Further, according to the method for manufacturing household thin paper according to the present embodiment, the convex portion 141D has the concave portion 142D formed at the tip end portion.
Therefore, according to the method for manufacturing household thin paper according to the present embodiment, the ground contact area between the pressing belt and the household thin paper can be made smaller than that in the configuration in which the recessed portion 142D is not formed at the tip end portion. It is possible to further improve the maintenance rate of the uppermost embossed EM1 and the chemical solution retention rate.

The specific description has been given above based on the embodiment according to the present invention, but the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist thereof.

[Other modifications]
Further, in the description of the embodiment of the present invention, regarding the shape of the pressing belt 14, a configuration in which the convex portion 141 based on the shape of the embossed EM1 is formed on the contact surface with the toilet cleaner 100 will be described as an example. However, the present invention is not limited to this. For example, instead of forming the convex portion 141 based on the shape of the embossed EM1, a concave portion based on the shape of the embossed EM1 is formed, and the embossed EM1 is housed in the concave portion when the toilet cleaner 100 is transported. Good.

In the description of the embodiments of the present invention, a toilet cleaner is taken as an example, but a wet sheet (wet sanitary thin paper) is not limited to toilet cleaners and can be used for all paper products (for example, kitchen cleaners). be able to. Further, not only wet sanitary thin paper but also dry sanitary thin paper can be used.

Further, in the description of the embodiments of the present invention, as the material of the toilet cleaner 100, the water-decomposable fiber aggregate is given as an example, but the present invention is not limited to this, and general paper using pulp or non-woven fiber is included.

Further, in the description of the embodiments of the present invention, the same configuration of the upper pressing belt 15 and the lower pressing belt 16 was given as an example, but the present invention is not limited to this, and at least either the upper pressing belt 15 or the lower pressing belt 16 is used. It suffices that a concavo-convex pattern (convex portion 141 or the like) based on the shape of the crab emboss EM1 is formed.

Further, in the description of the embodiments of the present invention, it is described that the effects of the present invention can be obtained under the base paper conditions and the chemical liquid conditions shown in the implementation conditions of the examples, but the present invention is not limited to this. That is, the present invention can obtain effects regardless of the conditions of the chemical solution and the base paper.

Further, in the description of the embodiments of the present invention, a circular shape is illustrated as the shape of the embossing EM1, but the shape of the embossing may be any shape such as an ellipse, a square, and a polygon.

In addition, the detailed configuration of the toilet cleaner 100 can be appropriately changed without departing from the spirit of the present invention.

100 Toilet cleaner (household thin paper)
1 1st original roll 1A continuous dry base paper 1B ply continuous sheet 1C continuous sheet 1D continuous water-disintegratable sheet 1E embossed sheet 2 overlapping part 3 spray nozzle 4 drying equipment 5 slitter 6 winder equipment 11 secondary original fabric roll 12 embossing roll 13 Finishing equipment EM11 embossing

Claims (5)

An embossing process for forming embossing on household thin paper;
After pressing the household thin paper on which the emboss is formed to a constant height by a pressing belt on which an uneven pattern based on the shape of the emboss is formed on the contact surface with the household thin paper on which the emboss is formed A packaging process for packaging the household paper of a certain height,
A method for producing household thin paper, comprising: And a chemical solution impregnating step of impregnating the thin paper for household use on which the emboss is formed with a chemical solution,
In the packaging step, the pressing belt presses the household thin paper impregnated with the chemical solution to make the height constant, and then the household thin paper having the constant height is packaged. 1. The method for manufacturing household thin paper according to 1. The method for manufacturing household thin paper according to claim 1 or 2, wherein the pressing belt has a convex portion based on the shape of the embossing formed on a contact surface with the household thin paper. The method for manufacturing household thin paper according to claim 3, wherein the convex portions are formed in a spot shape and arranged at a predetermined pitch. The method for manufacturing household thin paper according to claim 4, wherein the convex portion has a concave portion formed at a tip portion thereof.

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