JP7451194B2 - cleaning sheet - Google Patents

Description

The present invention relates to a cleaning sheet.

BACKGROUND ART In general, cleaning sheets for cleaning toilets and the like are known that are impregnated with a chemical solution, folded, and stored in a container such as a package (for example, see Patent Document 1).

JP 2019-112342 Publication

However, such cleaning sheets have problems in that the overlapping margin is difficult to discern, making it difficult to determine the opening position, and the sheets are stuck together by the chemical solution, making them difficult to open.

An object of the present invention is to provide a cleaning sheet that is easy to open and whose opening position is easy to see even when folded.

In order to solve the above problems, the invention as claimed in claim 1,
A cleaning sheet in which a base paper sheet is impregnated with a chemical solution and folded so that the overlapped ends are in the same position and stored in a package,
comprising a turned-up part opposite to the folded part of the cleaning sheet,
The cleaning sheet is characterized in that only the rolled-up portion is embossed to create a pattern that is different from other parts of the cleaning sheet.

The invention according to claim 2 is the cleaning sheet according to claim 1 ,
The rolled-up portion is characterized by being coated with a water repellent.

The invention according to claim 3 is the cleaning sheet according to claim 1 or 2 ,
The turned-up portion is characterized in that the end portion is wave-shaped.

According to the present invention, it is possible to provide a cleaning sheet that is easy to open and can be easily opened even when folded.

FIG. 2 is a plan view showing the cleaning sheet in a folded state according to the present embodiment. FIG. 2 is a plan view showing the cleaning sheet in an opened state according to the present embodiment. (a) is a diagram showing the fiber orientation of conventional paper, and (b) is a diagram showing the fiber orientation of the present invention. It is an enlarged view and sectional view of the embossed part of a cleaning sheet. It is an explanatory view showing an example of the contact area of embossing. It is a top view which shows the cleaning sheet of a folded state based on the modification of this embodiment. Both (a) and (b) are plan views showing a cleaning sheet in a folded state according to a modified example of the present embodiment. It is a top view which shows the cleaning sheet of a folded state based on the modification of this embodiment. It is a top view which shows the cleaning sheet of a folded state based on the modification of this embodiment.

Hereinafter, a toilet cleaner as a cleaning sheet according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9. However, the scope of the invention is not limited to the illustrated example.
Although the cleaning sheet will be explained using a toilet cleaner as an example, the cleaning sheet also includes wet tissue impregnated with a chemical solution for wiping.
Further, for convenience, the description will be made by defining the X direction, the Y direction, the vertical direction, and the horizontal direction as shown in the drawings.

[This embodiment]
The toilet cleaner S according to the present invention is preferably a wet type toilet cleaning sheet in which base paper sheets are ply-processed (laminated) and impregnated with a predetermined chemical solution.

For example, as shown in FIG. 1, when the toilet cleaner S is folded in two, it has a folded part V, and the edge facing the folded part V is colored in a color different from the color of the other parts. It is provided with a turning part 1.

Note that the edge here refers to a portion from the edge of the sheet to the center of the sheet, and it is preferable that coloring be applied at a distance of 0 mm to 7 mm from the edge of the sheet.
Furthermore, the coloring of the edges in this embodiment is not limited to continuous coloring, but may be intermittent coloring.

Note that if the base paper sheet is one in which three or more base paper sheets are ply-processed, unevenness will occur in the application of CMC, which will be described later, so it is preferable to use a base paper sheet in which two base paper sheets are ply-processed.
Further, the base paper sheet may be composed of a single base paper sheet that is not subjected to ply processing.
Further, the surface of the toilet cleaner S may be left as a base paper sheet, but is preferably embossed. For example, as shown in FIG. 2, two types of embossments EM11 and EM12 are provided.

The basis weight per sheet of base paper is approximately 30 g/m ² to 150 g/m ² . Note that the basis weight is based on JIS P8124.
Moreover, the base paper sheet of the toilet cleaner S of this embodiment is composed of a water-disintegrable fiber aggregate so that it can be disposed of directly into the water puddle of the toilet bowl after cleaning the toilet bowl or the like.

[Fiber aggregate]
The fiber aggregate is not particularly limited as long as it is a water-decomposable fiber aggregate, but single-layer or multi-layer paper or nonwoven fabric can be suitably used. The raw material fibers may be natural fibers or synthetic fibers, and it is also possible to mix these. Suitable raw material fibers include wood pulp, non-wood pulp, cellulose fibers such as rayon and cotton, biodegradable fibers made of polylactic acid, and the like. Moreover, while these fibers are used as main materials, polyethylene fibers, polypropylene fibers, polyvinyl alcohol fibers, polyester fibers, polyacrynitrile fibers, synthetic pulp, glass wool, etc. can be used in combination.

In particular, it is preferable that the fiber aggregate contains at least pulp, and the pulp used as a raw material is suitably a mixture of bleached hardwood kraft pulp (LBKP) and bleached softwood kraft pulp (NBKP) in an appropriate ratio.
More preferably, the blending ratio of bleached hardwood kraft pulp exceeds 50% by mass, that is, the blending ratio of bleached softwood kraft pulp to bleached hardwood kraft pulp is less than 1/1. By increasing the blending ratio of bleached broadleaf kraft pulp to bleached softwood kraft pulp, interfiber gaps are reduced and water evaporation is suppressed, making it possible to improve the drying resistance of toilet cleaner S.
Further, it may be constructed of a sheet made of pulverized pulp, or a sheet in which pulverized pulp is covered with or sandwiched between water-disintegrable paper.

[Water-soluble binder]
Additionally, a water-soluble binder is added to the base paper sheet of Toilet Cleaner S to increase paper strength. Water-soluble binders include carboxymethyl cellulose, polyvinyl alcohol, starch or its derivatives, hydroxypropyl cellulose, sodium alginate, trantho gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, purpuran, polyethylene oxide, bis Binder components such as cose, polyvinylethyl ether, polysodium acrylate, polysodium methacrylate, polyacrylamide, hydroxylated derivatives of polyacrylic acid, and polyvinylpyrrolidone/vinylpyrrolidone-vinyl acetate copolymer can be mentioned.

In particular, it is preferable to use a water-soluble binder having a carboxyl group because it has good water-disintegrability and can develop wet strength through crosslinking reaction.
The water-soluble binder having a carboxyl group is an anionic water-soluble binder that easily forms a carboxylate in water. Examples include polysaccharide derivatives, synthetic polymers, and natural products.

(Polysaccharide derivative)
Examples of polysaccharide derivatives include salts of carboxymethylcellulose, carboxyethylcellulose or its salts, carboxymethylated starch or its salts, and alkali metal salts of carboxymethylcellulose (CMC) are particularly preferred.

(CMC)
It is desirable for CMC to have a degree of etherification of 0.6 to 2.0, particularly 0.9 to 1.8, more preferably 1.0 to 1.5. This is because the expression of water disintegration and wet paper strength is extremely good.
Moreover, it is preferable to use water-swellable CMC. By cross-linking with specific metal ions, which are cross-linking agents in the chemical solution, this product has the ability to bind together the fibers that make up the base paper sheet while remaining unswollen, making it a useful toilet cleaning sheet that can withstand cleaning and wiping operations. This is because strength can be expressed.
In the case of the toilet cleaner S of this embodiment, CMC is added as a water-soluble binder.

CMC may be impregnated uniformly in the thickness direction of the base paper sheet, but it is preferable that the CMC content gradually increases from the center in the thickness direction of the base paper sheet toward the front and back surfaces. . This is because Toilet Cleaner S is less likely to break even when the edges of the toilet bowl are rubbed strongly, compared to conventional products uniformly impregnated with the same amount of water-soluble binder.

(synthetic polymer)
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. Monomers copolymerizable with these include esters of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, vinyl ether, and the like. Particularly preferred synthetic polymers are those using acrylic acid or methacrylic acid as the unsaturated carboxylic acid, and specifically, polyacrylic acid, polymethacrylic acid, salts of acrylic acid-methacrylic acid copolymers, acrylic acid or methacrylic acid, etc. Examples include salts of copolymers of acids and alkyl acrylates or alkyl methacrylates.
Natural products include sodium alginate, xanthan gum, gellan gum, taragant gum, and pectin.

(CNF)
Furthermore, cellulose nanofibers (CNF) can be added to the toilet cleaner S.
That is, CNF can be added to the water-soluble binder (in the case of this embodiment, CMC), and the specific surface area of the base paper sheet becomes larger than that of a composition containing only pulp.

Here, CNF refers to fine cellulose fibers obtained by defibrating pulp fibers, and generally refers to cellulose fibers containing cellulose fine fibers with a nano-sized fiber width (1 nm or more and 1000 nm or less). The fibers preferably have an average fiber width of 100 nm or less. The average fiber width is calculated using, for example, a number average of a certain number, a median, a mode diameter (most frequent value), or the like.

CNF may be impregnated uniformly in the thickness direction of the base paper sheet, but it is preferable that the CNF content gradually increases from the center in the thickness direction of the base paper sheet toward the front and back surfaces. . This is because Toilet Cleaner S is less likely to break even when the edges of the toilet bowl are rubbed strongly, compared to conventional products uniformly impregnated with the same amount of water-soluble binder.

(Pulp fiber that can be used for CNF)
Pulp fibers that can be used in the production of CNF include chemical pulps such as hardwood pulp (LBKP) and softwood pulp (NBKP), bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), and pressed stone ground pulp (PGW). ), Refiner Ground Pulp (RGP), Chemi Grand Pulp (CGP), Thermo Grand Pulp (TGP), Ground Pulp (GP), Thermo Mechanical Pulp (TMP), Chemi Thermo Mechanical Pulp (CTMP), Refiner Mechanical Pulp (RMP) Waste paper manufactured from mechanical pulp such as tea paper, kraft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, cardboard waste paper, white paper waste paper, Kent waste paper, imitation waste paper, land certificate waste paper, recycled paper waste paper, etc. Examples include deinked pulp (DIP) obtained by deinking pulp and waste paper pulp. These may be used alone or in combination of two or more types, as long as they do not impair the effects of the present invention.

(CNF defibration method)
Defibration methods used in the production of CNF include, for example, mechanical methods such as high-pressure homogenizer method, microfluidizer method, grinder milling method, bead mill freeze-pulverization method, and ultrasonic defibration method. It is not limited to.
Note that CNF that has been subjected to only mechanical treatment (not modified) by the above-mentioned defibration method, that is, CNF that has not been modified with functional groups, is different from that modified with functional groups such as phosphate groups and carboxymethyl groups. Since it has high thermal stability, it can be used in a wider range of applications, but it is also possible to use CNF modified with functional groups such as phosphoric acid groups and carboxymethyl groups in the present invention.
Further, for example, pulp fibers subjected to mechanical defibration treatment may be subjected to chemical treatment such as carboxymethylation, or enzyme treatment. Examples of chemically treated CNF include iCNF (individualized CNF) (single nanocellulose) with a diameter of 3 nm to 4 nm, such as TEMPO-oxidized CNF, phosphate-esterified CNF, and phosphite-esterified CNF. It will be done.
Further, CNF that has been subjected to only chemical treatment or enzyme treatment, or CNF that has been subjected to chemical treatment or enzyme treatment and mechanical defibration treatment may be used.

[Ratio of fiber orientation]
Furthermore, the ratio of vertical and horizontal fiber orientation (vertical/horizontal) of the toilet cleaner S is not particularly limited, but is preferably 0.8 to 2.0, and preferably 0.8 to 1.2. It is more preferable.
In the papermaking process, which is the paper manufacturing process, fibers are spread on the wire of the paper machine and flowed in the direction of conveyance. (for example, vertical:horizontal = 2.3:1, etc., see FIG. 3(a)). Therefore, the fiber density in the lateral direction is low and the fibers are easily torn. That is, it is easy to tear depending on the direction in which it is wiped. Therefore, in this embodiment, as shown in FIG. 3(b), the vertical and horizontal fiber orientation ratio of the toilet cleaner S is set to 0.8 to 2.0, preferably 0.8 to 1.2. , it is possible to provide a toilet cleaner S that is hard to tear even when wiped from any direction. Note that the ratio of vertical and horizontal fiber orientation can be determined by the ratio of wet strengths in the MD and CD directions.

[Medicinal solution]
Further, the toilet cleaner S of this embodiment is impregnated with a predetermined chemical solution containing a crosslinking agent that crosslinks with a water-soluble binder (CMC in the case of the toilet cleaner S of this embodiment). In addition, the chemical solution includes auxiliary agents such as glycol ethers, aqueous detergents, preservatives, disinfectants, and organic solvents.
The chemical solution is impregnated into the dried base paper sheet after the water-soluble binder is impregnated therein.
Further, the chemical liquid is impregnated in an amount of 100% to 500% by mass, preferably 150% to 300% by mass, based on the mass of the base paper sheet that is the base material of the toilet cleaner S.

(Crosslinking agent)
As the crosslinking agent, boric acid, various metal ions, etc. can be used, but when CMC is used as a water-soluble binder, it is preferable to use polyvalent metal ions. In particular, the use of one or more polyvalent metal ions selected from the group consisting of alkaline earth metals, manganese, zinc, cobalt, and nickel is recommended to ensure sufficient bonding between the fibers and to maintain a usable moisture content. It is preferable from the viewpoint of developing strength and sufficient water disintegration. Among these metal ions, it is particularly preferable to use calcium, strontium, barium, zinc, cobalt, and nickel ions.

(Glycol ethers)
Glycol ethers are compounds that have a structure in which the hydroxyl group at one or both ends of glycol, which is a dihydric alcohol, is etherified, and have a hydrophobic alkyl group, a hydrophilic ether group, and a hydroxyl group in the molecule. Because it has a smaller molecular weight than surfactants and a lower dynamic surface tension than conventional detergents containing only surfactants, it can form an interface between the chemical and dirt more quickly. Glycol ethers also act as coupling agents that make hydrophobic oils and dirt compatible with water, separating dirt and preventing it from re-adhering. Therefore, by adding glycol ethers to the chemical solution, the wiping performance of the toilet cleaner S can be improved.

The chemical solution in the present invention includes glycol ethers such as propylene glycol monomethyl ether (PGME), diethylene glycol monobutyl ether (DGME), ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, polyethylene glycol monomethyl ether, and ethylene glycol isopropyl. Contains ether, diethylene glycol monoisopropyl ether, triethylene glycol monomethyl ether, polyethylene glycol monomethyl ether, ethylene glycol isopropyl ether, diethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, etc.

In particular, PGME is usually added as a cleaning component and is known to improve cleaning power, but it also shows the effect of directly improving sheet strength, and has the effect of enhancing the sheet strength improvement effect of CMC and polyvalent metal ions. have. As a result, it is thought that a high deodorizing effect is achieved. The amount of PGME applied is preferably 20 to 60 g/m ² , more preferably 26 to 40 g/m ² . If it is less than 20 g/m ² , a sufficient deodorizing effect cannot be obtained. Further, even if more than 60 g/m ² is applied, a greater deodorizing effect than when 60 g/m ² is applied cannot be obtained.
DGME, like PGME, is an adjuvant that has the effect of improving sheet strength. The amount of DGME applied is preferably 5 g/m ² to 30 g/m ² , more preferably 10 g/m ² to 20 g/m ² .
However, if only DGME, which can improve sheet strength the most, is added, the oil from the user's hands may be wiped off, leading to rough hands. Therefore, in order to improve the sheet strength while preventing rough hands, it is necessary to mix glycol ethers such as PGME in addition to DGME in an appropriate proportion to the chemical solution.

(aqueous cleaning agent)
As the aqueous detergent, for example, in addition to surfactants, lower or higher (aliphatic) alcohols can be used.

(Preservative)
As the preservative, for example, parabens such as methylparaben, ethylparaben, and propylparaben can be used.

(disinfectant)
As the disinfectant, for example, benzalkonium chloride, chlorhexidine gluconate, povidone iodine, ethanol, benzanium cetyl oxide, triclosan, chlorxylenol, isopropylmethylphenol, etc. can be used. As the organic solvent, polyhydric alcohols such as glycol (bivalent), glycerin (trivalent), and sorbitol (tetravalent) can be used.

Further, the adjuvants for the components of the medicinal solution described above can be selected as appropriate, and components that perform other functions may be included in the medicinal solution as necessary. For example, propylene glycol (PG) can be used as an adjuvant to solubilize preservatives and disinfectants.

[Emboss]
In addition, the surface of the toilet cleaner S may be a base paper sheet, but it is preferable that the surface is embossed. In the case of the toilet cleaner S, for example, as shown in FIG. This is done through processing.

The shape, number, area ratio, etc. of the embossments are arbitrary, but in the case of Toilet Cleaner S, the embossed EM11 are arranged in a rhombic lattice. Wiping unevenness can be reduced compared to the case where the Further, the embossed EM12 is arranged between the embossed EM11.

As shown in FIG. 4(a), the embossed portion PR21 of the embossed EM11 has a curved shape.
Moreover, as shown in FIG. 4(b), the embossed portion PR22 of the embossed EM12 has a planar shape.

Since the embossed EM12 is arranged between the embossed EM11, the bulged portion PR21 of the embossed EM11 and the bulged portion PR22 of the embossed EM12 are brought into close contact with each other, as shown in FIG. 4(c). It will be formed as a continuous embossed EM21.
Alternatively, the bulging portion PR21 of the embossed EM11 and the bulging portion PR22 of the embossed EM12 may be just close to each other and not continuous.

The two types of embossments EM11 and EM12 formed in this way can increase the contact area with the object to be cleaned, etc., so that the hardness of the toilet cleaner S is reduced and the wiping performance is improved.

That is, by forming an embossed EM11 in which the bulging part PR21 is a curved surface and an embossed EM12 in which the bulging part PR22 is a flat surface on the entire surface of the toilet cleaner S, force is applied to the toilet cleaner S during the wiping operation. At this point, each emboss is deformed and the contact area is increased for the first time, so the contact area is increased and the flexibility is also improved due to the deformation of each emboss.

For example, in the case of a single embossed EM11, as shown in FIG. occurs in On the other hand, when two types of embossed EM11 and EM12 are combined, as shown in FIG. It can be seen that SN32 increases compared to contact area CN31 in FIG. 5(a).

Moreover, the two types of embossing EM11 and EM12 can similarly obtain the effects of normal embossing, and can improve the texture, absorbency, bulkiness, etc. of the toilet cleaner S. Furthermore, the continuous embossed EM 21 can also provide an effect of improving appearance by embossing, similar to normal embossing.

[Folding process]
Toilet Cleaner S is folded into two by being folded and stored in a plastic storage case or packaging film in the folded state, and is unfolded as needed when in use. At this time, as shown in FIG. 1, the folding portion V provided at a position offset from the center position of the sheet in the X direction or Y direction causes the sheet to be folded so that the overlapped ends are shifted in position.
Specifically, it is preferable that the toilet cleaner S is folded by a folding portion V that is deviated from the center position in the X direction or the Y direction by 1 mm to 5 mm, and that the edges of the sheets are overlapped with a deviation of 2 mm to 10 mm. It is more preferable that the sheets are folded by a folding portion V that is deviated from the center position in the direction or the Y direction by 1.5 mm to 2.5 mm, and that the ends of the sheets are overlapped with a deviation of 3 mm to 5 mm.

As described above, since the folded portion V is formed to cause folding misalignment, even if the folded sheets are stuck together due to the chemical solution, they can be easily peeled off and spread out. Furthermore, in the case of a multi-ply sheet, it is possible to reduce the risk of accidentally separating the sheets.
Note that if the deviation of the sheet ends is less than 2 mm, the effect of making it easier to spread cannot be obtained sufficiently, and if it is larger than 10 mm, the area where the sheets do not overlap becomes too large, making it easy for the sheets to dry, and The above range is preferable since the appearance of the film also deteriorates.

Note that the configuration in which the folded sheet is folded so that the ends of the sheet are shifted to make it easier to unfold the folded sheet is not limited to this embodiment, and can be widely used in folded cleaning sheets.
Alternatively, as shown in FIG. 6, the sheets may be folded so that the overlapped ends are in the same position without any folding deviation.

[Effects of embodiment]
As described above, according to the present embodiment, the toilet cleaner S includes a folded part V in the folded state, and a rolled-up part 1 whose edge facing the folded part V is colored. Therefore, when the user unfolds the folded sheet, it becomes easy to see the overlapping margin and the opening position.

[Modified example]
Modifications of this embodiment will be described below.

Furthermore, in the present embodiment, the rolled-up portion 1 is only colored, but the invention is not limited to this; for example, a water repellent such as oil or silicone may be applied to the rolled-up portion 1. do not have.
By doing this, the rolled part 1 is not impregnated with the chemical solution, the sheets are less likely to stick together even in the folded state, and only the rolled part 1 can be easily separated, making it easier to see the overlap margin. , it becomes easier to pinch the turning part 1, and it becomes easier to spread the sheet.

In addition, in FIG. 1, the shape of the end of the rolled part 1, which is the cut surface in the cutting process, is linear, but by changing the shape of the cutting equipment, for example, as shown in FIG. , it may be made into a wave shape.
Wave shapes include straight wave shapes as shown in Figure 7(a) and curved wave shapes as shown in Figure 7(b), and the size of each wave is not necessarily the same. By doing this, it becomes easier to see the overlapping margin of the folded toilet cleaner S, and it becomes easier to grasp the end of the rolled-up part 1.
Note that the shape of the end of the rolled portion 1 is not limited to the wavy shape as shown in FIGS. 7(a) and 7(b), but may be other shapes.

Further, in the present embodiment, the turned-up portion 1 is colored, but the invention is not limited to this, and a pattern such as a dot pattern may be applied, as shown in FIG.
By doing this, even a user who does not have strong color discrimination ability can easily understand the overlapping margin of the folded toilet cleaner S.
Furthermore, the pattern is not limited to the colored pattern as shown in FIG. 8, but may also be an embossed pattern. In this case, the coloring process can be omitted, and the overlapping margin of the toilet cleaner S can be adjusted due to the difference in tactile sensation. You will be able to confirm.

Further, although FIG. 1 shows a case in which the rolled-up portion 1 is not folded back, the present invention is not limited to this, and the rolled-up portion 1 may be further folded back as shown in FIG. 9 .
By doing this, the rolled up part 1 becomes particularly thick among the toilet cleaners S, so it becomes easy to see the overlapping margin of the folded toilet cleaner S, and it also becomes easy to pinch the rolled up part 1, so that the sheet can be easily removed. It becomes easier to spread.
Note that the direction in which the rolled up portion 1 is folded is not limited to outward folding as shown in FIG. 9, and may be inward folded; This is preferable because it makes it easier to pick up 1.
Further, if the rolled portion 1 can be recognized by the difference in thickness between the rolled portion 1 and other parts, the coloring shown in FIG. 9 may not be applied.

Further, in the present embodiment, the toilet cleaner S is folded in two and stored, but the present invention is not limited to this. It may be folded into three or eight folds for storage.
Further, in this embodiment, the case where the rolled up part 1 is provided only on the edge of one end of the toilet cleaner S is illustrated, but the invention is not limited to this, and the rolled up part 1 may be provided on the edges of both ends. good.
In addition, at this time, it is preferable that the coloring, pattern, and change in the shape of the edge portions applied to each rolled portion 1 are different from each other.

S Toilet cleaner (cleaning sheet)
V Folding part 1 Rolling part

Claims (3)

A cleaning sheet in which a base paper sheet is impregnated with a chemical solution and folded so that the overlapped ends are in the same position and stored in a package,
comprising a turned-up part opposite to the folded part of the cleaning sheet,
A cleaning sheet characterized in that only the rolled-up portion is embossed to create a pattern that is different from other parts of the cleaning sheet. The cleaning sheet according to claim 1, wherein the rolled-up portion is coated with a water repellent. The cleaning sheet according to claim 1 or 2, wherein the rolled-up portion has a wave-shaped end.

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