JPH1099248A - Wiping sheet and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the buoyancy of a sheet to sink easily in water in a toilet bowl or a septic tank, by plying a plurality of sheets to form bulky swelling of sheets to make it easily held by a hand, to improve its wiping effect, and to make air intervening between sheets be easily purged out by the swelling. SOLUTION: On the surface and the back face of a first sheet S1 processed by low crepe processing for a low extending rate on liquid impregnation or unprocessed, a second sheet processed by high crepe processing to give an extending rate high than that of the first sheet S1 is partially adhered. To form swelling of the second sheet S2 by the difference of extending rates by restoration of crepe to make the second sheet 2 bulky. Above-mentioned first and second sheets S1 and S2 are formed with a number of small pores 3 to make air between voids C between both sheets easily purged out through pores 3 to make the sheet easily sunk in stagnant water in a flashing toilet or a purifier.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiping sheet which is used for cleaning or disinfecting or disinfecting flush toilets or for wiping a human body, and which can be discarded after use. The present invention relates to a wiping sheet capable of preventing accumulated water in a flush toilet and floating in a septic tank and a method for manufacturing the same.

[0002]

2. Description of the Related Art A water-disintegratable wet sheet that can be discarded in a flush toilet is used for cleaning a toilet or a room or for wiping a butt when changing diapers. This wet sheet is obtained by impregnating a water-decomposable sheet formed of fibers such as wood pulp fibers and a binder that is soluble or swellable with water with a cleaning chemical. Cleaning chemicals are surfactants in water and alcohol,
It contains a cleaning component, a preservative, a fragrance, and the like, and further contains a metal ion and the like for suppressing dissolution of the binder. This wet sheet can maintain the strength of the sheet without being decomposed in the state where the cleaning chemical solution containing the metal ions is impregnated, and when flowing into a flush toilet, a large amount of water dilutes the metal ions of the cleaning chemical solution. Decomposed in flush toilet or septic tank.

[0003]

However, in the conventional wet sheet, a flat water-disintegrable sheet is used as one sheet, or two or three sheets are piled up, so that the bulk of the sheet itself is used. But low and thin. Therefore, when holding the sheet with the hand and wiping the cleaning place, the touch of holding the sheet with the hand cannot be obtained. For example, the hand and the sheet are slippery, and the use feeling is poor.
Therefore, in order to make the sheet bulky and obtain a feeling like a cloth cloth, it is conceivable to use a bulky sheet such as a non-woven fabric in a stacked manner. However, such a bulky sheet contains a lot of air between the stacked sheets, and the buoyancy of the entire sheet increases. As a result, there arise problems such as difficulty in floating in the pool water in the flush toilet and difficulty in sinking in the septic tank.

[0004] This type of wet sheet is stored in a container in a state of being folded in four or eight.
It is generally used in a four-fold, eight-fold or two-fold state during cleaning, and is often thrown into a flush toilet in a four-fold or eight-fold state after use. However, with the sheet folded,
Since air exists on the valley side of the folded portion, buoyancy is generated by this air, and the flow in the flush toilet is deteriorated.
Some conventional wet sheets of this type are perforated so that they can be separated into two, but each perforation has a short cut.
Therefore, when thrown away in the flush toilet, the air existing on the valley side of the folded portion of the sheet cannot be sufficiently escaped from the cut of the perforation, which contributes to the suppression of buoyancy. Absent.

The present invention has been made to solve the above-mentioned conventional problems. In a wiping sheet which can be disposed of on a toilet or the like after wiping off dirt, the overall buoyancy is reduced even if the sheet is made bulky. It is an object of the present invention to provide a wiping sheet which is easy to sink in pool water of a flush toilet or a septic tank and a method of manufacturing the same.

Further, the present invention facilitates escape of air on the valley side of the fold portion when discarded in a flush toilet in a state of four-fold, eight-fold or two-fold, thereby making it possible to collect water in the flush toilet or in a septic tank. The purpose of the present invention is to provide a wiping sheet that is easy to sink in.

[0007]

According to a first aspect of the present invention, there is provided a wiping sheet according to the present invention, wherein a plurality of water-decomposable sheets are stacked, and the sheets are partially joined by a plurality of joints. A bulge is formed in at least one of the sheets between the portions, and the at least one sheet has a large number of holes that allow the air between the sheets due to the bulge to communicate with the outside air. It is a feature.

Further, the wiping sheet of the present invention comprises a first sheet which is decomposable with water and has a low crepe ratio or no crepe, and a first sheet which is also decomposable with water and which is decomposable with water.
The second sheet having a higher crepe rate than the sheet is overlapped, and the sheets are partially joined by a plurality of joining portions,
A bulge is formed in the second sheet in a region between the joints due to a difference in elongation due to the restoration of the crepe of both sheets, and the second sheet is bulky. At least one sheet has the bulge. , And a large number of holes for communicating the air between the sheets and the outside air are formed.

In the above, the second sheet may be overlaid on both the front and back sides of the first sheet, and at least a plurality of holes may be formed in the second sheet on both sides.

According to a second aspect of the present invention, there is provided a wiping sheet in which a water-decomposable sheet is folded. It is characterized by being partially formed,

[0011] More preferably, the sheet is folded in two at a first folded portion, and further folded by a second folded portion orthogonal to the first folded portion. At the intersection of the folded portions, a notch is formed partially so that air on the valley side of the folded portion can escape to the mountain side.

In the above, a perforation for cutting the sheet is formed in the folded portion, and a partial cut for releasing air is opened longer than each cut of the perforation. It is possible.

The method for producing a wiping sheet of the present invention is for producing the wiping sheet according to the first aspect of the present invention, wherein a large number of irregularities are formed on the surface of a papermaking cylinder in a wet papermaking process to form a large number of holes. Forming a sheet decomposable with water, and partially joining a plurality of sheets including at least one sheet formed in the above-described step, so that a region between the joints is formed. And forming a bulge on at least one of the sheets to increase the bulk, thereby producing a wiping sheet in which a gap between the sheets due to the bulge and the outside air are communicated through a large number of holes in the sheet.

In the above, in the step of winding the sheet from the drying drum in the wet papermaking step, the sheet is subjected to creping to form a second sheet, which has a lower crepe rate or crepe than the second sheet. The second sheet is superimposed on the first sheet not to be joined, and the sheets are partially joined, and the difference between the elongation rates due to the restoration of the crepe of the first sheet and the second sheet is caused by the difference between the joining sections. It is preferable to form a swelling in the second sheet.

The wiping sheet of the present invention is used, for example, for cleaning toilets, and after use, is discarded as it is in a flush toilet, and can be decomposed with toilet water or water in a septic tank. The wiping sheet is formed by stacking a plurality of sheets, each of which is a paper containing a natural pulp fiber or a chemical fiber such as rayon, or a nonwoven fabric, and is formed so as to be decomposable with water.
For example, the sheet is composed of fibers, such as natural pulp, and a water-soluble or water-swellable binder, such as carboxymethylated pulp or carboxymethylcellulose, that binds the fibers together. Also,
The plurality of sheets are joined to each other with a water-soluble adhesive such as water-soluble carboxymethyl cellulose.

The sheet according to the present invention may be any sheet as long as it can be disassembled in the septic tank, and is not limited to the above.

In the wiping sheet, at least one of the sheets has a swelling between a plurality of joints. A method for forming the swelling is, for example, to have a crepe wrinkle having a low elongation or A first sheet without crepe and a second sheet with crepe wrinkles having a higher elongation than the first sheet are overlapped and partially joined, for example, the second sheet is The sheet is partially adhesively bonded to the front and back surfaces to form a three-layer structure.
When the cleaning solution is impregnated after the first sheet and the second sheet are joined, the second sheet expands due to the restoration of the crepe. At this time, the elongation rate of the first sheet and the second sheet is increased. Due to the difference, the second sheet swells between the joints. Further, as shown in FIG. 3, a plurality of short joints in a row may be formed at a constant pitch, and wrinkles having continuous fine irregularities may be formed on the surface of the second sheet.

The wiping sheet of the present invention has at least one
Since the sheets have a bulge between the joints, the sheets become bulky, are easily held by hand, and are less likely to slip between the hand and the sheet during wiping. In addition, the bulging portion of the sheet exerts an effect of scraping off dirt, making it easy to wipe off dirt.

However, the method of forming a bulge in a sheet according to the present invention is not limited to a method of giving a difference in crepe ratio between sheets. For example, uneven wrinkles are formed in advance by corrugating, and this sheet is partially formed. The sheet may be joined together to form a bulge in the sheet between the joined portions.

When the discarded flush toilet after wiping off the dirt, at least a large number of holes are formed in the sheet appearing on the surface, so that the air in the gap between the sheets due to the swelling of the sheet is discharged from the large number of holes. It becomes easy to escape to the outside, and the wiped sheet after use tends to sink in pool water of a flush toilet or in a septic tank.

One example of a method for forming a large number of holes in a sheet is to form a large number of irregularities on the surface of a papermaking cylinder provided in a papermaking tank (wire part) in a wet papermaking process. Make paper,
Forming a paper layer (or fiber web) having a number of holes corresponding to the irregularities, and forming the paper layer (or fiber web);
Is wound up with a drying drum and dried to produce a base paper (sheet) having a large number of holes. Further, when creping the sheet (base paper), a doctor blade is applied to the drying roll to give a difference in rotation speed between the drying roll and the winding roll.

Sheet (base paper) produced in the papermaking process
The size of the hole is, for example, an average diameter of 1.0 to 5.0 mm.
The degree is preferred. The holes in the sheet of the present invention may be any holes as long as the air in the gap between the sheets escapes to the outside, and may be a hole of a size that can be seen, or a very fine hole. The high and low fiber density portions of the base paper or non-woven fabric used as the base material are repeated at a constant pitch, and the low fiber density portions (coarse portions) function as holes for allowing air to escape. Good.

In the step of forming a number of holes in the sheet, a fiber web was formed on a porous belt, and an air shower was applied to the web to form a number of holes corresponding to the holes of the belt. The sheet may be used, or a sheet in which holes are formed on the entire surface of the sheet with a needle or the like may be used.

According to the second aspect of the present invention, a long notch having a predetermined length is partially formed in a folded portion when the sheet is folded. More preferably, when the sheet is further folded after being folded in two, the long cut is formed at a portion where each folded portion intersects. When this sheet is folded and discarded in the flush toilet, the air existing on the valley side of the folded portion escapes from the long cut to the outside, the buoyancy is reduced, and the sheet easily sinks in the flush toilet or the septic tank. In the case where a perforation for cutting the sheet is formed in the folded portion, the long cut for releasing air is formed in a portion different from the perforation or in an intermediate portion of the perforation to release air. Therefore, the opening size of the long cut is made larger than the opening size of each cut in the perforation.

The long slit may be used in combination with the one using the porous sheet of the first invention,
In addition, the effect of reducing the buoyancy can be exerted simply by making the long cuts in the conventional wiping sheet made of a water-disintegratable sheet having no holes.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the structure of the wiping sheet of the present invention, and FIGS. 2 (A) and 2 (B).
FIG. 3C is a cross-sectional view showing a method of joining sheets, FIG. 3 is a partially enlarged plan view of a wipe sheet showing a state of formation of joints and bulging wrinkles, and FIG. 4 shows an example of a manufacturing method of forming a porous sheet. FIG. 5 is a partially enlarged view showing the papermaking cylinder of FIG.

The wiping sheet 1 shown in FIG. 1 is used, for example, for cleaning toilets or wipes, and is discarded in flush toilets after use.
It can be decomposed by pool water from flush toilets or water from septic tanks. This wiping sheet 1 is a first sheet S
1 and the second sheets S2 and S which are partially adhesively bonded to the front and back surfaces of the first sheet S1 by the adhesive bonding portion A.
The second sheet S2 has a three-layered sandwich structure in which a bulge is formed in the second sheet S2 in a region between the adhesive joints A to make the second sheet S2 bulky. Alternatively, it may have a two-layer structure in which the first sheet S1 and the second sheet S2 are stacked one by one and adhered.
A bulge is formed in the second sheet S2 in a region between the adhesive joints A.

The first and second sheets are prepared by adding carboxymethylated pulp or carboxymethylcellulose as a water-soluble or water-swellable binder, or polyvinyl alcohol, starch, carrageenan, galactomannan, or the like to natural fibers such as natural pulp fibers. It contains acrylic acid esters and the like, and is decomposable by water. Each of the sheets S1 and S2 has a large number of fine holes. For example, the fine pores are provided in a wet papermaking process.

FIG. 4 illustrates the wet papermaking process. Raw fibers such as natural pulp fibers and carboxylmethylated pulp, for example, are stirred with water in the pocher 10 and sent to the paper making tank 11 (wire part). In the paper making tank 11 (wire part), the raw material fibers are adhered to the outer periphery of the cylinder 12 by the circulation pressure of the pump 13 to form a paper layer (fiber web) W. The paper layer (fiber web) W is transferred to the wet felt 14, further transferred from the top felt 15 to the drying drum 16, and dried on the surface of the drying drum 16. As shown in FIG. 5, fine protrusions 12a are formed on the surface of the papermaking cylinder 12, and small holes penetrate through a paper layer (fiber web) W corresponding to the protrusions and recesses having the protrusions 12a. ,
Alternatively, small holes are formed in which the density of the fibers decreases and air easily passes.

The sheet S dried by the drying drum 16
2 (or S1) is wound up by the winding drums 18 and 19, and a doctor blade 17 is applied to the surface of the drying drum 16 so that the peripheral speed of the winding drums 18 and 19 is higher than the peripheral speed of the drying drum 16. The setting is made late, and the sheet S2 is creped. The peripheral speed difference between the drying drum 16 and the winding drums 18 and 19 differs between the sheets S1 and S2, and the crepe rate is adjusted by the magnitude of the peripheral speed difference. The sheet S1 is set to have a low crepe rate (or no crepe is formed), and the sheet S2 is set to have a high crepe rate relative to the sheet S1.

The sheets S1 and S2 are stacked as shown in FIG. In FIG. 2A, the first sheet S
The adhesive 2 is applied to both front and back surfaces of the first sheet S, and the second sheet
2, S2 are superimposed on the front and back surfaces of the first sheet S1.
The adhesive 2 is applied, for example, so as to have a bonding pattern shown in FIG. 3, and the adhesive 2 is, for example, water-soluble carboxymethyl cellulose. First sheet S1
The second sheets S2 and S2 are sandwiched by the heating plates 4 and 5 while being humidified in a state where the sheets S2 and S2 are overlapped. Heating plate 5
Is provided with an emboss 5a corresponding to the pattern of the adhesive joint A, and the sheet is pressed and heated by the emboss 5a, so that the first sheet S1 and the second sheet S2 are joined at the adhesive joint A. Adhesively bonded to each other. FIG. 2B shows the bonded structure.

The sheets S1 and S thus adhered and bonded are
2 is impregnated with water and alcohol, a surfactant, a preservative, a deodorant and a fragrance, and a cleaning chemical solution containing metal ions and the like for suppressing the hydrolysis of the sheet. When the detergent solution is impregnated, the crepe wrinkles of the sheet are restored and elongation occurs. However, since the crepe rate of the second sheet S2 is higher than that of the first sheet S1, and the elongation of the second sheet S2 at the time of crepe restoration is larger than that of the first sheet S1, as shown in FIG. In the region between the adhesive joints A, the second sheet S2 swells to form a bulky wiping sheet 1. Since the detergent solution impregnated in the sheets contains metal ions such as calcium and strontium as described above, the carboxylmethylated pulp contained in the first and second sheets and the aqueous solution that bonds the sheets to each other are used. A crosslinkable complex is formed with an adhesive such as carboxymethylcellulose, and the decomposition of the binder and the joint is suppressed. Also, when discarded in a flush toilet after use, the cleaning chemical is diluted with a large amount of water, and the sheet and the adhesive joint can be decomposed with water.

FIG. 3 shows an example of the bonding pattern of the bonding portion A. In FIG. 3, the first and second sheets are:
Are partially adhesively bonded by a short straight short bonding portion a shown by. This short joint a
The rows extend in the Y direction, and the rows extending in the Y direction are the adhesive joints A shown in FIG. The short joining portion a is in the direction in which the crepe wrinkles b of the second sheet S2 extend (X direction) and the pitch direction of the short joining portion a (Y direction).
The rows (adhesive joints A) in which short joints a are arranged are formed at predetermined intervals in the X direction.

When each of the sheets S1, S2, S2 is impregnated with the cleaning solution, fine wrinkles b due to the creping process tend to expand in the Y direction. At this time, since the first sheet S1 and the second sheet S2 are bonded at the short joining portion a,
In this portion, the second sheet S2 is unlikely to elongate in the Y direction. On the other hand, the second sheet S2 is likely to extend in the Y direction at the portion sandwiched between the short joints a, and the second sheet S2 is likely to be loosened at the portion due to the extension (A) in the Y direction. As a result, in a region sandwiched between the adhesive bonding portions A arranged in the Y direction, a valley connecting the short bonding portions a on both sides is formed, and a bulge connecting the both sides is formed. Yamabe appears. Therefore, in a region sandwiched between the adhesive joints A, wrinkles B having irregularities substantially corresponding to the arrangement pitch of the short joints a appear, and the convex portions (peaks) bulge. By forming the wrinkles B, the wiping effect can be enhanced.

The wiping sheet 1 thus formed
As shown in the cross-sectional view of FIG. 2C, in the region between the adhesive joints A, bulges occur in the uneven wrinkles B, particularly at the peaks, and the second sheet S2 A gap C is generated between the first sheet S1 and the first sheet S1, and the first sheet S1 is bulky. When the wiping sheet 1 is flushed to a toilet or the like after use, the air in the gap C escapes from the small holes 3 formed in the first sheet S1 and the second sheet S2, and the buoyancy of the sheet is reduced. Since water enters between the sheets S1 and S2 from the small holes 3, the wiping sheet easily sinks in pool water of the flush toilet or in the septic tank.

FIG. 6 is a perspective view showing a state in which the wiping sheet 1 is folded, and FIG. 7 is a partially enlarged view of FIG. As shown in FIG. 6, this wiping sheet 1
Is folded in two by the folded portion (broken line) L1, and a second folded portion (broken line) orthogonal to the first folded portion L1
Folded by L2, folded in four, and
Is folded from the fold L3 to form eight folds. When stored in a container, it is normally folded in eight. When used for wiping and cleaning, it differs depending on the size of the hand and the wiping location, but the four-fold state shown in FIG.
Alternatively, it is used in an eight-fold state.

Further, a perforation P1 is formed in the second folded portion L2 so that the wiping sheet 1 can be separated into two pieces by separating the perforation P1 in a folded state. . This perforation P1
Is one in which short cuts are formed at a constant pitch. As shown in FIGS. 6 and 7 (a partially enlarged view of FIG. 6), the first folded portion L1 has partially long cuts P2 and P3. The cuts P2 and P3 are formed sufficiently longer than the individual cuts of the perforations P1. The notch P
2 is formed at the ridge of the folded part L1;
The cut P3 is formed between the first folded portion L1 and the second folded portion L2.
Are formed at the intersections.

Therefore, after cleaning, the wiping sheet 1
In the state of being folded from the first folded part L1 in a folded state, or in the state of folded in four as shown in FIG. 6, or even in the state of folded in eight, the first folded part L1 The air interposed in the folded valley portion (i) in the above becomes easy to escape to the outside from the cuts P2 and P3, the buoyancy is not increased by the air in the valley portion (i), and the flush toilet It tends to sink in pool water or septic tanks. Further, when discarded in the flush toilet in the 4-fold or 8-fold state shown in FIG. 6, not only the valley portion (i) of the folded portion L1 but also the inside (ii) of the intersection of the folded portion L1 and the folded portion L2. It is easy for air to accumulate,
The air in the part (i) can easily escape from the part of the cut P3 to the outside. Therefore, even if it is discarded in the flush toilet in the folded state, the buoyancy in the accumulated water or the septic tank is reduced, and it becomes easy to sink.

In the second folded portion L2,
Long cuts P2 and P3 may be formed in the middle of the perforation P1. In the above example, the wiping sheet 1 is used in a wet state impregnated with a detergent solution in a plastic container or the like. Alternatively, it may be stored in a container in a dry state and impregnated or not impregnated with a detergent solution when used.

As described above, the wiping sheet of the present invention is a bulky sheet in which a plurality of sheets are stacked and a bulge is formed on the sheet, so that it is easy to hold by hand and has an excellent wiping effect. In addition, since the swelling facilitates the escape of the air interposed between the sheets to the outside, the buoyancy of the accumulated water in the flush toilet and the septic tank is reduced, and the water easily sinks.

Also, when thrown into a flush toilet in a folded state, such as a folded state, a folded state, or a folded state, air in the valley side of the folded portion easily escapes to the mountain side and easily sinks in the flush toilet or the septic tank.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall structure of a wiping sheet of the present invention;

FIGS. 2A, 2B, and 2C are cross-sectional views showing a bonding step in a method for manufacturing a wipe sheet according to the present invention;

FIG. 3 is a partial plan view showing an example of an adhesive pattern of the wiping sheet;

FIG. 4 is an explanatory view illustrating a wet papermaking process.

5 is a partially enlarged view of the papermaking cylinder shown in FIG.

FIG. 6 is a perspective view showing a state in which the wiping sheet is folded in four.

7 is a partially enlarged view of FIG. 6,

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiping sheet 2 Adhesive 3 Small hole 12 Papermaking cylinder 12a Minute convex part S1 First sheet S2 Second sheet A Adhesive joint B Wrinkle C Void a Short joint L1 First folded part L2 Second Folded part L3 Third folded part P1 Perforation P2, P3 Notch W for releasing air W Paper layer (or fiber web)

Claims (8)

[Claims] 1. A plurality of water-decomposable sheets are stacked, and the sheets are partially joined by a plurality of joints, and a bulge is formed on at least one of the sheets between the joints to increase bulkiness. A wiping sheet characterized in that at least one sheet is formed with a large number of holes for communicating a space between the sheets due to the bulging and the outside air. 2. A first sheet which is decomposable in water and has a low crepe rate or no crepe, and a second sheet which is also decomposable in water and has a higher crepe rate than the first sheet are overlapped. The sheets are partially joined by a plurality of joints, and a bulge is formed in the second sheet in a region between the joints and the joint due to a difference in elongation due to restoration of the crepe of both sheets. A wiping sheet characterized by being bulky, wherein at least one sheet is formed with a large number of holes for communicating a space between the sheets due to the bulging and the outside air. 3. The wiping sheet according to claim 2, wherein the second sheet is overlapped on both sides of the first sheet, and a large number of holes are formed in at least the second sheets on both sides. 4. A wiping sheet in which a water-decomposable sheet is folded, wherein a notch is formed in a folded portion of the sheet so that air at a valley side of the folded portion can escape to a mountain side. A wiping sheet characterized in that: 5. The sheet is folded in two at a first folded portion, and further folded by a second folded portion orthogonal to the first folded portion, wherein the first folded portion and the second folded portion are folded. 5. The wiping sheet according to claim 4, wherein a notch is formed at a crossing portion of the folded portion so that air on a valley side of the folded portion can escape to a hill side. 6. A perforation for cutting a sheet is formed in the folded portion, and a partial cut for releasing air is opened longer than each cut of the perforation. 5. The wiping sheet according to 5. 7. A step of forming a water-decomposable sheet having a large number of holes by forming a large number of irregularities on the surface of a papermaking cylinder in a wet papermaking step, and forming at least one sheet formed by the step. And a step of partially joining a plurality of sheets including, forming a bulge in at least one of the sheets in the region between the joints and the joints to make it bulky, the gap between the sheets due to the swelling and the outside air. Is a method for producing a wipe sheet that is communicated by a number of holes in said sheet. 8. A step of winding the sheet from a drying drum in the wet papermaking step, creping the sheet to form a second sheet, and having a lower crepe rate or crepe than the second sheet. The second sheet is superimposed on the first sheet not to be joined, and the sheets are partially joined, and the difference between the elongation rates due to the restoration of the crepe of the first sheet and the second sheet is caused by the difference between the joining sections. The method for producing a wipe sheet according to claim 7, wherein a bulge is formed in the second sheet by the method.