JP3801404B2 - Water degradable sheet for flush toilet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-decomposable sheet for a flush toilet used for wiping ass after excretion as a substitute for toilet paper. In particular, the present invention relates to a water-decomposable sheet for a flush toilet suitable for use in a toilet equipped with a washing device.
[0002]
[Prior art and problems]
In recent years, toilets equipped with cleaning devices have become widespread. In this toilet, the excretion part (buttock part or perineum part) can be washed with a shower of water or warm water after excretion. After washing, water drops attached to the excretory part are dried with warm air or wiped off with toilet paper. Moreover, since it takes too much time to dry with warm air alone, it is often wiped off with toilet paper before it is completely dried.
[0003]
However, since the toilet paper is formed in a sheet shape by only hydrogen bonds between pulps so as to be easily disintegrated when discarded in a flush toilet, the wet strength is extremely low. Therefore, if wiping is performed in a state where moisture is adhered to the excretion part, the toilet paper is torn, and as a result, the toilet paper cannot be wiped well or the torn toilet paper is likely to adhere to the excretion part.
[0004]
On the other hand, JP-A-8-56868 discloses a toilet paper to which a cationic aldehyde-modified polyacrylamide copolymer is added as a toilet paper for a flush toilet with a cleaning device. However, this toilet paper does not have sufficient wet strength. Moreover, since the resin is added to paper similar to normal toilet paper, one sheet is very thin. Therefore, it is necessary to pull out a large amount at the time of use, and use them in a state where they are folded and stacked, which is very troublesome.
[0005]
Japanese Laid-Open Patent Publication No. 10-73559 discloses a toilet paper in which a high water absorption layer and a low water absorption layer are laminated and joined. However, the superabsorbent layer used as a wiping surface has a low wet strength and may break during use and stick to the excretory part. Further, when a large amount of moisture is wiped off, the moisture will soak up to the opposite side of the wiping surface, and the hand holding the toilet paper will be soiled.
[0006]
Further, JP-A-8-204080 discloses toilet paper in which laminated paper is sandwiched between two elongated papers. In this toilet paper, it is possible to prevent moisture from penetrating to the hand holding the paper by making the laminated paper thick, but if it is too thick, it becomes difficult to use because it lacks flexibility. Further, since the surface of the toilet paper, which is the wiping surface, is normal toilet paper, the wet strength on the surface is still not sufficient.
[0007]
An object of the present invention is to provide a water-decomposable sheet for a flush toilet that has a wet strength that cannot be broken even if a wet excretion part is wiped after using a cleaning device, and that is excellent in water-decomposability.
[0008]
A further object of the present invention is to provide a water-decomposable sheet for flush toilets that does not ooze up to the back side even when a large amount of moisture is wiped off and the hands holding the sheet are not soiled.
[0009]
Another object of the present invention is to provide a water-decomposable sheet for a flush toilet that is easy to use and easy to use.
[0010]
[Means for Solving the Problems]
The first invention of the present invention is a belt-like surface layer formed of a hydrophilic and water-degradable fiber sheet , a belt-like back layer formed of a water-decomposable fiber sheet , and between the surface layer and the back layer. A plurality of water-decomposable liquid-absorbing layers interposed at intervals in the longitudinal direction, the wet strength of the surface layer is higher than the wet strength of the liquid-absorbing layer ,
A thermoplastic water-soluble resin layer is provided between the back layer and the liquid absorption layer, and the surface layer and the back layer are disposed on both left and right sides of the liquid absorption layer. And a joint extending in the longitudinal direction is formed, and
Between the adjacent liquid absorbing layers, there is formed a bonded portion in which the surface layer and the back layer are bonded via the water-soluble resin layer. In this bonded portion, a sewing machine is disposed between the adjacent liquid absorbing layers. A water-decomposable sheet for a flush toilet, characterized in that eyes are formed and can be cut at the perforations .
[0011]
In the water-decomposable sheet for a flush toilet according to the present invention, since a liquid absorbing layer is present, moisture hardly permeates into the back side, and the hand holding the water-decomposable sheet is hardly soiled. Also, the wet strength of the surface layer is relatively high. Therefore, even when wiping water droplets on the surface layer, the surface layer is difficult to tear, and even after wiping the hips etc. with water droplets after using the cleaning device, the sheet is difficult to tear, and the conventional problem that the torn sheet sticks to the excretion part Does not occur. After use of this water-decomposable sheet, it is poured into the toilet in the same manner as ordinary toilet paper, but at this time, each layer is separated and easily water-disintegrated.
[0012]
The water-soluble resin layer may be laminated on the back layer. Alternatively, a water-repellent resin layer may be formed on the surface of the water-soluble resin layer facing the liquid absorption layer. Since it can prevent moisture from penetrating to the back side, hands are surely not soiled.
[0014]
Said surface layer and backing layer, in the liquid absorbent layer is not provided edges, it is preferable that the fused via a thermoplastic water-soluble resin layer. The fiber sheet does not fall apart during use and is easy to use.
[0015]
Conveniently, a holding sheet is provided on the outer surface of the back layer with its edges joined, and a hand can be inserted between the back layer and the holding sheet.
[0016]
The second aspect of the present invention provides a plurality of hydrolyzed layers that are overlapped at intervals in the longitudinal direction on a belt-like center layer formed of a hydrophilic and water-decomposable fiber sheet and both surfaces of the center layer. and sex of the liquid absorbent layer and a hydrophilic covering the surfaces of each of the liquid absorbent layer and a surface layer of the strip formed by the fibrous sheet of water-disintegratable, said wet strength of the surface layer of the liquid absorbent layer Higher than wet strength ,
A thermoplastic water-soluble resin layer is provided between both surfaces of the center layer and the liquid absorption layer, and the surface layer and the center layer are formed on the left and right sides of the liquid absorption layer. A joining portion that is joined through the conductive resin layer and extends in the longitudinal direction is formed,
Between the adjacent liquid absorption layers, each surface layer and the center layer are bonded to each other through the water-soluble resin layer, and in this bonded portion, between the adjacent liquid absorption layers. A water-decomposable sheet for a flush toilet, characterized in that a perforation is formed in the perforation and can be cut at the perforation .
[0017]
In this case, since the surface layer having higher wet strength than the liquid absorption layer covers both the front and back surfaces, both surfaces can be used as a wiping surface.
[0018]
The water-soluble resin layer may be laminated on both surfaces of the center layer. Further, a water repellent resin layer may be formed on the surface of the water-soluble resin layer facing the liquid absorbing layer.
[0022]
In the first and second inventions, the surface layer is preferably a water-decomposable nonwoven fabric. In this case, the surface layer includes a fiber main body, a fibrillated rayon having a microfiber having a length of 1 mm or less extending from the fiber main body, and other fibers having a fiber length of 10 mm or less, and subjected to water jet treatment. More preferably, it is a spunlace nonwoven fabric. This spunlace nonwoven fabric can maintain sufficient wet strength and water decomposability without using a binder.
[0023]
A large number of apertures may be formed in the surface layer .
[0024]
At this time, the longitudinal direction can be rounded into a roll shape. Alternatively, the perforation portions may be alternately mountain-folded and valley-folded, and portions sandwiched between the perforations and the perforations may be overlapped in the sheet thickness direction.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the water-decomposable sheet for the flush toilet of the present invention will be described in detail. FIG. 1 is a perspective view showing a water-decomposable sheet for a flush toilet according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.
[0026]
The water-decomposable sheet 1A shown in FIG. 1 has a strip shape continuously extending in the longitudinal direction (Y direction) and is wound in a roll shape. As shown in FIG. 2, the water-decomposable sheet 1 </ b> A is interposed between a surface layer 10 made of a hydrophilic and water-decomposable fiber sheet serving as a wiping surface, a back layer 12, and the surface layer 10 and the back layer 12. It is formed with the water-decomposable liquid absorbing layer 11. And the surface layer 10 and the back layer 12 are joined in the peripheral area | regions 1e and 1e of the width direction (X direction) orthogonal to a longitudinal direction, and the liquid absorption layer 11 does not detach | leave easily from the hydrolyzable sheet | seat 1A. It has become.
[0027]
When the water-decomposable sheet 1A is used, the water-decomposable sheet 1A is cut along the perforations 5 provided at predetermined intervals in the Y direction, and the surface layer of the water-decomposable sheet having a size suitable for use separately. 10 is used as a wiping surface. After use, it is washed away in the same way as normal toilet paper. When it comes into contact with a large amount of water, the layers are separated, and the water-decomposable sheet for flush toilets collapses due to slight force (water flow). The water-decomposable sheet 1A preferably has a water-decomposability measured in accordance with the water decomposability test method of JIS P 4501 of 200 seconds or less. More preferably, it is 100 seconds or less.
[0028]
The surface layer 10 is a fiber sheet formed from water-dispersible fibers. Water dispersible fibers include, for example, natural fibers such as softwood pulp, hardwood pulp, wood pulp, manila hemp, linter pulp, kenaf, regenerated cellulose such as viscose rayon, copper ammonia rayon, solvent-spun cellulose, fibrillated rayon, Degradable polylactic acid and polybutylene succinate can be mentioned. These water-dispersible fibers preferably have a fiber length of 10 mm or less from the viewpoint of water decomposability. Examples of the fiber sheet include hydrolytic paper obtained by paper-making these water-dispersible fibers, and water-decomposable spunlace nonwoven fabric obtained by subjecting the water-dispersible fiber web to water jet treatment.
[0029]
Among these, it is preferable that the surface layer 10 is a spunlace nonwoven fabric. The spunlace nonwoven fabric has high wet strength and strong resistance to friction, so that it is difficult to tear even if a large amount of water droplets are wiped off. In addition, the touch to the user's skin is soft and the feeling of use is good. In this case, it is preferable that the fiber sheet contains fibrillated rayon. The fibrillated rayon has, for example, a fiber body having a fiber length of 7 mm or less and a microfiber having a fiber length of 1 mm or less extending from the fiber body. When a water jet treatment is applied to a web composed of this fibrillated rayon and the fiber having a fiber length of 10 mm or less, excretion occurs due to the entanglement between the microfiber and other fibers and / or the hydrogen bonding force of the microfiber. Sufficient wet strength can be obtained without tearing when the part is wiped. Further, when a large amount of water is given, the binding force of the microfiber is reduced and the water is easily hydrolyzed in a short time. Moreover, the touch of the fiber sheet is improved by the microfiber. The blending ratio of the microfiber in the fiber sheet is preferably 10% or more.
[0030]
Also, when the surface layer 10 is made of only the fibrillated rayon, or hydrolyzed paper made from fibrillated rayon and pulp, it is possible to obtain a high wet strength as compared with conventional toilet paper.
[0031]
In addition, since the surface layer 10 is a wiping surface that comes into direct contact with the skin, the surface layer 10 is preferably formed of only fibers, but may be made by adding a binder such as polyvinyl alcohol, carboxymethyl cellulose, or alkyl cellulose, Further, the binder may be impregnated on the surface of the fiber sheet by coating or coating. In addition, the surface layer 10 is preferably provided with a large number of apertures on the front surface in order to quickly transfer the wiped moisture to the liquid absorption layer 11.
[0032]
The wet strength (breaking strength when wet) of the fiber sheet forming the surface layer 10 is preferably 980 mN / 25 mm or more so as not to be broken even when a large amount of water droplets are wiped off. The wet strength is obtained by impregnating a fiber sheet cut to a width of 25 mm and a length of 150 mm with water twice as much as its mass, and measuring with a Tensilon tester at a chuck interval of 100 mm and a tensile speed of 100 mm / min. Tensile force (mN). More preferably, it is 1300 mN / 25 mm or more.
[0033]
Since the liquid absorption layer 11 functions to absorb moisture, it does not directly contact the skin, so the resistance to friction may be small, and the wet strength may be lower than the surface layer 10.
[0034]
The liquid absorption layer 11 can be formed from, for example, hydrolyzed paper, pulp, or hydrolyzable nonwoven fabric. For example, airlaid pulp or the like can be formed using a basis weight of about 50 to 70 g / m ² . In the case of forming with water-disintegrating paper, it is preferable to form a plurality of relatively thin water-dissolving papers because of good water disintegrating property. For example, the liquid absorbing layer 11 is formed by stacking about 4 to 8 pieces of hydrolytic paper having a basis weight of 10 to 20 g / m ² . Further, it is preferable that the water-degrading paper is creped to give a thick feeling. Furthermore, the liquid absorbing layer 11 may be formed by providing air laid pulp under a plurality of pieces of hydrolytic paper (on the back layer 12 side). In addition, the wet strength of the liquid absorption layer 11 is the wet strength of the liquid absorption layer 11 as a whole, and is a value measured in a stacked state if, for example, a plurality of sheets of hydrolytic paper are stacked.
[0035]
Further, in the water-decomposable sheet 1A shown in FIG. 1, the liquid absorbing layer 11 is not provided in the vicinity of the perforation 5 but is provided at a predetermined interval in the Y direction for each perforation 5. This is because the water-decomposable sheet separated by the perforation 5 has the perforation 5 as an edge, and the vicinity of the edge does not participate in wiping, and therefore the liquid absorption layer 11 is not required near the perforation 5. On both sides where the perforation 5 is formed, the surface layer 10 and the back layer 12 are joined in the same manner as the peripheral region 1e .
[0036]
Further, in the water-decomposable sheet 1A, a water-soluble resin layer 13 is provided on the back layer 12 on the liquid absorption layer 11 side, and a water-repellent resin layer 14 is provided on the water-soluble resin layer 13 (liquid absorption layer 11 side). It has been. For this reason, when a large amount of water droplets are wiped off with the water-decomposable sheet 1A, even if the water permeates up to the liquid absorbing layer 11, the water repellent resin layer 14 and further the water-soluble resin layer 13 cause the water to enter the back layer 12. Can be surely prevented.
[0037]
The backing layer 12 can be formed of any water-soluble or water-soluble material such as water-degradable paper containing water-dispersible fibers or water-degradable nonwoven fabric. For example, the back layer 12 uses (1) pulp as a raw material and hydrolytic paper formed into a sheet by hydrogen bonding between pulp fibers, and (2) uses water-dispersible fibers such as pulp and rayon as a raw material to bond the fibers. A water-disintegrating paper containing a water-soluble binder to be formed into a sheet shape, (3) a water-disintegrating paper formed into a sheet shape by entanglement of water-dispersible fibers, and (4) a water-dispersible fiber having a relatively short fiber length. A water-decomposable non-woven fabric entangled by water jet treatment can be used. However, since the back layer 12 is held by hand, it is preferably a water-decomposable spunlace nonwoven fabric containing the same fibrillated rayon as the surface layer 10 in consideration of the touch.
[0038]
The water-soluble resin layer 13 is a water-soluble resin such as polyvinyl alcohol, modified polyvinyl alcohol, alkyl cellulose such as carboxymethyl cellulose and methyl cellulose, a cationic aldehyde-modified polyacrylamide copolymer or a copolymer made of an unsaturated carboxylic acid. Formed by. Among these, thermoplastic polyvinyl alcohol is preferable.
[0039]
The water-soluble resin layer 13 can be formed by applying a water-soluble resin to the back layer 12 using a coater or the like. Further, a water-soluble resin may be added to the back layer 12 by spraying or impregnation. However, it is preferable to form a water-soluble resin layer having a predetermined thickness between the back layer 12 and the liquid-absorbing layer 11. For example, the water-soluble resin is melt-extruded on the back layer 12 in the form of a film. Then, it is preferable to laminate the film-like water-soluble resin layer 13 on the back layer 12. Further, as the water-soluble resin layer 13, a film-like one that is separate from the back layer 12 can be used, and this water-soluble resin film can be used on the back layer 12. When the water-soluble resin layer 13 is formed into the laminate or a single film, water penetration from the liquid absorption layer 11 to the back layer 12 can be prevented, and the water-repellent resin layer 14 is formed on the surface of the water-soluble resin layer 13. Easy to form.
[0040]
In the case where a thermoplastic water-soluble resin is used for the water-soluble resin layer 13, the water-soluble resin layer 13 is interposed in the peripheral region 1e (and both side portions of the perforation 5) extending in the Y direction as shown in FIG. In this state, the surface layer 10 and the back layer 12 can be joined by heat fusion or ultrasonic fusion .
[0041]
Even if only the water-soluble resin layer 13 is provided, it is possible to prevent moisture from leaking to the back layer 12 with a high probability, but by providing the water-repellent resin layer 14 on the water-soluble resin layer 13, Furthermore, waterproofness becomes high. The compound that forms the water repellent resin layer 14 is a silicone compound or a fluorine compound. It is preferable that it is a silicone compound from the ease of a process. Since the silicone compound is provided on the water-soluble resin layer 13, a small amount of the silicone compound can be applied thinly. Silicone compound is preferably a basis weight 0.01 to 0.3 g / m ² approximately. When it is larger than the upper limit, the water disintegration property of the water-soluble resin layer 13 is remarkably lowered. The silicone compound is fixed by heat treatment or ultraviolet irradiation treatment after coating or coating.
[0042]
In addition, since the back layer 12 is sealed with the water-soluble resin, the water-repellent resin layer 14 can be easily formed, and when a large amount of water is given, the water-soluble resin is dissolved, so that the water-repellent resin layer 14 is dissolved. The resin layer 14 is peeled off from the back layer 12, and the water repellent resin layer 14 can be dispersed in water.
[0043]
Since the water-decomposable sheet 1A for a flush toilet obtained as described above is wound in a roll shape as shown in FIG. 1, it can be used by being put in a normal toilet paper holder. Further, the water disintegratable sheet 1A is provided with perforations 5 extending in the X direction with a predetermined interval in the Y direction. At the time of use, the water-decomposable sheet 1A is cut along the perforation 5, and the water droplets around the excretory part are wiped off with the surface layer 10 of the separated water-decomposable sheet. When the perforation 5 is provided, it is convenient to use as much as necessary during use, and fibers or fibers and sheets of each layer are mechanically entangled at the time of opening for forming the perforation. The Therefore, each layer is lightly joined at the perforation of the separated water-decomposable sheet, and each layer is unlikely to fall apart from the edge on the perforation side during use.
[0044]
In consideration of wiping off the water-degradable sheet 1A wound in a roll shape as shown in FIG. 1, the back layer 12 is preferably wound in a roll shape so as to be positioned on the outer surface of the roll. It is possible to shift to the wiping operation as it is without turning the front and back of the water-decomposable sheet 1A gripped by the hand.
[0045]
FIG. 3 is a sectional view showing a second embodiment of the present invention. A water-decomposable sheet 1B for a flush toilet shown in FIG. 3 is one in which the water-decomposable sheet 1A shown in FIG. The water-decomposable sheet 1B is composed of the surface layers 10a and 10b, the liquid absorption layers 11a and 11b, the water-repellent resin layers 14a and 14b, the water-soluble resin layers 13a and 13b, and the center layer 12a in this order from the outer side to the center. . In this case, any of the surface layers 10a and 10b may be used as a wiping surface.
[0046]
The center layer 12a of the water-decomposable sheet 1B may be formed of the same water-decomposable fiber sheet as the back layer 12 shown in FIG. 2, or may be a water-soluble or water-decomposable resin film.
[0047]
Moreover, in the thing shown in FIG. 3, since the liquid absorption layers 11a and 11b exist in the front and back both sides, when water | moisture content is wiped with the surface layer 10a, for example, a water | moisture content does not osmose | permeate easily to the surface layer 10b. Therefore, when the center layer 12a is formed of a fiber sheet, it is not always necessary to provide the water-repellent resin layers 14a and 14b .
[0048]
FIG. 4 is a perspective view showing a third embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. A water-decomposable sheet 1C for a flush toilet shown in FIGS. 4 and 5 is formed in the same manner as the water-decomposable sheet 1A shown in FIG. However, the back layer 12 extends longer in the X direction than the surface layer 10, that is, the end portion 1f of the water-decomposable sheet 1C, thereby forming an extending portion 12c. The extended portion 12c is bent into the back layer 12 at the end portion 1f, and the back layer 12 and the extended portion 12c are joined in the peripheral regions 1d and 1d. As a result, a holding sheet by the extending portion 12c is formed on the back side of the water-decomposable sheet 1C, and a bag body that can be inserted in the direction of the arrow 21 from the opening portion 20 is formed during use. In addition, the said water-decomposable joining means similar to the joining of the surface layer 10 and the back layer 12 can be used for the joining.
[0049]
The water-decomposable sheet 1C may be formed for each use as shown in FIG. 4, but is continuously formed in the longitudinal direction (Y direction) as shown in FIG. You may make it separable with the perforation 5 for every minute. In this case, when the perforations are formed in the peripheral areas 1d and 1d, the back layer 12 is woven along the edge 1f by a folding machine, and thus the water-decomposable sheets 1A and 1B shown in FIGS. Therefore, the manufacturing method is simple. In this case, when the surface layer 10 and the back layer 12 are joined in the peripheral region 1e, the peripheral regions 1d and 1d of the extending portion 12c can be joined together to the back layer 12.
[0050]
In the water-decomposable sheet 1C, the extending portion 12c is formed by extending the back layer 12, but the extending portion 12c (holding sheet) is formed by a water-decomposable sheet separate from the back layer 12, Fused through a thermoplastic water-soluble resin layer, bonded by hydrogen bonding, or bonded to the surface of the back layer 12 in the peripheral regions 1e, 1d, and 1d by bonding using a hydrolyzable mechanical bonding means. Also good.
[0051]
The holding sheet forming the bag body may be a belt-shaped member extending in the Y direction, and both end portions of the belt-shaped holding sheet may be bonded to the back layer 12 by a bonding means capable of water disintegration.
[0052]
FIG. 6 is a perspective view showing another embodiment of the present invention. In FIG. 1, the water-decomposable sheet is wound in a roll shape, but as shown in FIG. A portion sandwiched between the perforation 5 and the perforation 5 is overlapped in the sheet thickness direction (Z direction). The stacked water-decomposable sheets are accommodated in a package 30 provided with an outlet 31 for the water-degradable sheet.
[0053]
At the time of use, the water-decomposable sheet is drawn out from the take-out port 31 and cut at the perforation 5 so that the amount of use for one use can be used. In addition, it is preferable to apply to the water-decomposable sheet 1B which can use the both surfaces shown in FIG. 3 as a wiping surface in the water-degradable sheet accommodated in the state as shown in FIG.
[0054]
However, the water-decomposable sheet 1A shown in FIG. 2 and the water-decomposable sheet 1C shown in FIG. 5 may be stored in the package 30 as shown in FIG.
[0056]
The packaging body 30 may be a hard material formed of a plastic material, but it is preferable that the packaging body 30 is formed of a soft packaging material such as a film. Is preferably water-soluble or hydrolyzable. When the packaging body 30 is formed of a soft packaging material, the packaging body 30 can be used for portable purposes.
[0057]
【The invention's effect】
As described above in detail, in the water-decomposable sheet for a flush toilet according to the present invention, moisture hardly penetrates into the back side, and the hand holding the water-decomposable sheet is not easily soiled. Further, the wet strength of the surface layer is relatively high, and even if a large amount of water droplets are wiped on the surface layer, the surface layer is hardly broken. Therefore, it is most suitable for wiping the buttocks with a large amount of water drops after using the cleaning device. After use of this water-decomposable sheet, it is poured into the toilet in the same manner as ordinary toilet paper, but at this time, each layer is separated and easily water-disintegrated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a water-decomposable sheet for a flush toilet according to the present invention. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 shows a second embodiment of the water-decomposable sheet according to the present invention. FIG. 4 is a perspective view showing a third embodiment of the water-decomposable sheet of the present invention. FIG. 5 is a cross-sectional view taken along line VV of FIG. FIG. 7 is a perspective view showing an embodiment of the present invention.
1A, 1B, 1C Water-decomposable sheet 1e, 1d Peripheral region 1f End 5 Perforation 10, 10a, 10b Surface layer 11, 11a, 11b Liquid absorbing layer 12 Back layer 13 Water-soluble resin layer 14 Water-repellent resin layer 20 Opening 30 Package 31

Claims (14)

A band-shaped surface layer formed of a hydrophilic and water-decomposable fiber sheet , a band-shaped back layer formed of a water-decomposable fiber sheet , and a space in the longitudinal direction between the surface layer and the back layer. A plurality of water-decomposable liquid-absorbing layers, the wet strength of the surface layer is higher than the wet strength of the liquid-absorbing layer ,
A thermoplastic water-soluble resin layer is provided between the back layer and the liquid absorption layer, and the surface layer and the back layer are disposed on the left and right sides of the liquid absorption layer. And a joint extending in the longitudinal direction is formed, and
Between the adjacent liquid absorbing layers, there is formed a bonded portion in which the surface layer and the back layer are bonded via the water-soluble resin layer. In this bonded portion, a sewing machine is disposed between the adjacent liquid absorbing layers. A water-decomposable sheet for a flush toilet , wherein eyes are formed and can be cut at the perforations . The water-soluble resin layer, the water disintegratable sheet for flush toilet according to claim 1, characterized in that laminated to the backing layer. The water-decomposable sheet for a flush toilet according to claim 1 or 2, wherein a water-repellent resin layer is provided on a surface of the water-soluble resin layer facing the liquid absorption layer. 2. A holding sheet is provided between the adjacent perforations on the outer surface of the back layer with an edge thereof joined, and a hand can be inserted between the back layer and the holding sheet. The water-decomposable sheet for flush toilets according to any one of 3 to 3 . And strip-shaped central layer and formed of a fiber sheet of water-decomposable hydrophilic, and a plurality of water-decomposable liquid absorbing layer superposed at intervals in the longitudinal direction on each of both surfaces of the central layer, each of said And a strip-shaped surface layer formed of a hydrophilic and water-degradable fiber sheet covering the surface of the liquid absorption layer, the wet strength of each surface layer is higher than the wet strength of the liquid absorption layer ,
A thermoplastic water-soluble resin layer is provided between both surfaces of the central layer and the liquid absorbing layer, and the surface layer and the central layer are disposed on the left and right sides of the liquid absorbing layer. A bonding portion is formed that extends in the longitudinal direction by being bonded via the conductive resin layer,
Between the adjacent liquid absorption layers, each surface layer and the center layer are bonded to each other through the water-soluble resin layer, and in this bonded portion, between the adjacent liquid absorption layers. A water-degradable sheet for a flush toilet , wherein a perforation is formed in the perforation, and the perforation can be cut at the perforation . The water-decomposable sheet for a flush toilet according to claim 5, wherein the water-soluble resin layer is laminated on both surfaces of the center layer. The water-decomposable sheet for a flush toilet according to claim 5 or 6 , wherein a water-repellent resin layer is provided on a surface of the water-soluble resin layer facing the liquid absorbing layer. The water-decomposable sheet for a flush toilet according to any one of claims 1 to 7, wherein the water-degradable sheet is rolled into a longitudinal direction. 8. The water washing according to any one of claims 1 to 7, wherein the perforations are alternately fold-folded and valley-folded, and the portions sandwiched between the perforations and the perforations are overlapped in the sheet thickness direction. Water decomposable sheet for toilets. The water-decomposable sheet for a flush toilet according to any one of claims 1 to 9 , wherein the surface layer is a water-decomposable nonwoven fabric. The surface layer includes a fiber body, a fibrillated rayon having a microfiber having a length of 1 mm or less extending from the fiber body, and another fiber having a fiber length of 10 mm or less, and a spunlace nonwoven fabric subjected to a water jet treatment The water-decomposable sheet for flush toilets according to claim 10 . The water-decomposable sheet for a flush toilet according to any one of claims 1 to 11 , wherein a large number of holes are formed in the surface layer. The water-decomposable sheet for a flush toilet according to any one of claims 1 to 12, wherein the water-decomposability in a state separated between perforations is 200 seconds or less. The water-soluble sheet for a flush toilet according to any one of claims 1 to 13, wherein the water-soluble resin layer is formed of polyvinyl alcohol.

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