JP2656025B2 - Water disintegrable paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention has sufficient strength even in a wet state when used, and disintegrates when disposed in a large amount of water such as a flush toilet. About paper.

[Conventional technology and its problems] Conventional baby wipes, feminine hygiene wet tissues or defecation treatment wet tissues are made of a nonwoven fabric or a water-insoluble binder made by a spunbond method as a tissue base. Nonwoven fabric obtained by completely binding is used.For example, when discarded in a flush toilet, the product retains its form as it is. May interfere with function.

Therefore, a method of impregnating a non-woven fabric using a water-soluble binder with an aqueous solution containing a specific salt which renders the water-soluble binder temporarily insoluble in water or a salt having a predetermined concentration or more required for salting out is disclosed in Patent No. -104963, which discloses polyvinyl alcohol as a water-soluble binder, a boric acid aqueous solution having a concentration of 3% or more as an aqueous solution containing specific salts which are made temporarily insoluble in water, and a solution for salting out polyvinyl alcohol. An aqueous solution of sodium sulfate having a concentration of 7% or more is used.

However, the above-mentioned sulfuric acid aqueous solution and sodium borate aqueous solution have problems in terms of safety such as primary irritation to skin, irritation to ocular mucosa, and oral toxicity.

JP-A-59-144426 discloses a water-disintegratable nonwoven fabric impregnated with an oily liquid. As the water-disintegrable nonwoven fabric, a nonwoven fabric made of cellulosic fibers or a water-soluble binder is used. Non-woven fabric with fibers bonded together is used, and since the non-woven fabric is impregnated with an oily liquid, there is no breakage of hydrogen bonds between cellulosic fibers or breakage of a water-soluble binder in a wet state, and its use strength is sufficient. It dissolves when immersed in a large amount of water.

However, when wiping the skin of the human body, the impregnated oily liquid adheres to the skin, causing stickiness and discomfort, and since the excrement from the human body is water-soluble, the impregnated oily liquid There is a problem that it is difficult to mix with the liquid.

In addition, when the human skin is wiped off by moistening water with a water-disintegrating nonwoven fabric, fibers are generally released (hereinafter referred to as paper powder).
May form and adhere to the skin. As an example, when water is used on toilet paper currently on the market, the fact is confirmed.

The generation of such paper dust becomes a particularly serious problem when the water-disintegratable nonwoven fabric as described above is used for wipes,
In addition, if such a means for preventing the generation of paper dust is applied, there is a problem that the water dissolvability of the nonwoven fabric is reduced, and the technical problem has not been solved at present.

The present invention has been made in order to solve the above problems, and has sufficient strength in a wet state, and when discarded in a flush toilet, its shape is easily destroyed, resulting in a fibrous or small block. It is an object of the present invention to obtain a water-disintegrable paper which is dispersed in a shape and does not generate paper powder when used.

[Means for Solving the Problems] That is, the present invention provides a fiber layer in which fibers are partially bonded with a water-insoluble resin on one or both sides of a fiber layer in which fibers are not bonded with a water-insoluble resin. The present invention relates to a water-disintegrable paper that is bonded and a water-disintegrable paper in which the water-disintegrable paper is partially cut.

The water disintegration referred to in the present specification means that, when discarded in a flush toilet or the like, the paper is easily broken by flowing water to a size that does not easily cause blockage in the sewage pipe or hinder the function of the simple septic tank. Refers to the nature.

[Operation] The water-disintegrable paper of the present invention is provided with a fiber layer in which fibers are partially bonded with a water-insoluble resin on one or both sides of a fiber layer in which fibers are not bonded with a water-insoluble resin. Therefore, even when the fiber layer provided with the water-insoluble resin is in a wet state, the fibers are prevented from being detached.

If this paper is discarded in, for example, a flush toilet, the fiber layer in which the fibers are not bonded with the water-insoluble resin easily disperses into a fibrous form, leaving a thin fiber layer provided with the water-insoluble resin. . Even in the case of a water-disintegratable paper having a three-layer structure, the above-described phenomenon occurs because the fiber layer which is not bonded with the water-insoluble resin in the middle layer is divided into two. However, since the remaining fiber layer has a small thickness and the fibers are partially adhered with a water-insoluble resin, a small block is formed by mechanical force such as a water flow in a sewage pipe or a water flow in a simple septic tank. Destroyed. Therefore, the blockage of the sewage pipe and the function of the simple septic tank are not hindered. Further, in order to improve the water disintegration property, the water disintegrable paper may be partially cut in advance.

In order to produce a fiber layer that does not generate such paper dust and is destroyed by weak mechanical force such as water flow, it is necessary to thin the fiber layer in which fibers are partially bonded with a water-insoluble resin. In addition, it is necessary to provide the water-insoluble resin in a spot form. If the amount of the water-insoluble resin is too large, a continuous resin film is formed and is not broken by a weak mechanical force.

[Example] The water-disintegrable paper of the present invention is obtained by providing a thin fiber layer in which fibers are partially bonded with a water-insoluble resin on one or both sides of a fiber layer in which fibers are not bonded with a water-insoluble resin. Or even a partial cut in the paper.

The water-disintegratable paper of the present invention has fibers partially bonded with an insoluble resin on one or both sides of a fiber layer where fibers are not bonded with a water-insoluble resin by a wet lamination process usually performed in the paper manufacturing industry or the like. It is manufactured by laminating a fiber layer.

The fiber used is not particularly limited as to the fiber layer in which the water-insoluble resin is not provided. For example, softwood fibers such as Japanese red pine and Abies sachalinensis, and hardwood fibers such as beech and mizunara, as well as kozo, mitsumata,
Natural fibers for papermaking, such as woody bast fibers such as gampi, herbaceous bast fibers such as flax, hemp, jute, and ramie; leaf fibers such as manila hemp and sisal; monocotyledonous plant fibers such as bamboo, straw, and bagasse Pulp; Regenerated cellulose fibers such as viscose rayon and cupra; Polyamide fibers such as nylon; Polyester fibers; Vinyl chloride fibers; Vinylidene chloride fibers; Polypropylene fibers; Acrylic fibers; . Among them, rayon fibers such as fiber pulp or rayon for papermaking are preferable because they are easily decomposed by microorganisms such as cellulomonas and cell vibrio bacteria.

When synthetic fibers are used, they are not used alone to perform wet lamination with a fiber layer provided with a water-insoluble resin described below, but are used in a mixture with natural fiber pulp for papermaking, and Fiber usage is 50% by weight
It is preferred that: If the amount is more than 50% by weight, it becomes difficult for the fiber layers to adhere to each other, and it becomes difficult to perform wet bonding.

The length of these fibers is not particularly limited.

Examples of the fibers used for the fiber layer provided with the water-insoluble resin include natural fiber pulp for papermaking such as the aforementioned softwood fibers, hardwood fibers, woody bast fibers, herbaceous bast fibers, leaf fibers, and monocotyledonous plant fibers. It is preferred that In order to prevent the separation of the paper powder, it is preferable that the fibers have a mechanical entanglement. Generally, synthetic fibers have no mechanical entanglement between the fibers, and the fibers are very easily detached. The natural fiber pulp for papermaking is preferably subjected to beating treatment, which is usually performed, since the fibers are fibrillated and the mechanical entanglement between the fibers is stronger than when the beating treatment is not performed.

In addition, the fiber length of this natural fiber pulp for papermaking is 1 to 10 from the viewpoint of generation of paper powder and water disintegration when discarded in a flush toilet.
mm is preferable, but in order to break the fiber layer provided with the water-insoluble resin into an appropriate size, 3 to 7 m
m is particularly preferable.

When a water-disintegrable paper is produced using a fiber having a fiber length of more than 10 mm, the water-disintegrability decreases, and when it is less than 1 mm, generation of paper powder increases, which is not preferable.
Softwood bleached kraft pulp (hereinafter referred to as NBKP) can be given as such a fiber.

 Water-insoluble used to partially bond fibers
The resin needs to be attached in the form of fine spots. Also
If water-insoluble resin is continuously provided, the fiber
The layer will not break due to weak mechanical forces such as water currents.
You. Therefore, as a water-insoluble resin, wet papermaking method
Must be usable and detailed
No. Such resins include short fiber length thermoplastics for wet papermaking.
There are conductive fibers, and Daiwabopo is a specific example of such fibers.
Repro (Daiwa Spinning Co., Ltd.), Chisso ES (Chisso)
Co., Ltd.), polyethylene synthetic pulp SWP (Mitsui Petrochemical
Gaku Kogyo Co., Ltd.), Partex (Lexster Corporation)
And so on. Among these, polyethylene
Synthetic pulp SWP Or polypropylene synthetic pulp
Partex Has a longer fiber length than other thermoplastic fibers.
It is particularly suitable because it is short and has many branches.

The adhesion amount of these polyolefin synthetic pulp differs depending on whether or not a partial cut is formed as described later. It said adhesion amount but is usually 0.4~1.7g / m ^2, it is preferred if the partial cut is not provided in the range of 0.4~1.0g / m ^2, provided with a partial cut It was the case preferably in the range of 0.4~1.4g / m ^2. If the deposition amount is less than 0.4 g / m ^2, many occurrence of paper dust,
In addition, when the amount of use is larger than the above upper limit, the water disintegration becomes poor, which is not preferable.

Next, the basis weight of the fiber layer to which fibers are partially adhered with the water-insoluble resin is preferably in the range of 4 to 40 g / m ² . The fibrous layer much as possible speaking from the gist of the present invention is preferably thin, in fact the case of papermaking, or cause part fibers are not deposited is less than 4g / m ^2, and if more than 40 g / m ² Is not preferred because the water disintegration is reduced.

It is preferable to use a fiber layer which does not adhere the fibers with a water-insoluble resin and has a certain thickness in order to maintain the strength of the product, and preferably has a basis weight of about 50 to 150 g / m ² .

The wet laminating process is performed by a usual method as described above. That is, in the paper making process, two or three wet paper webs are overlapped, dehydrated under pressure, and then dried to obtain a base paper.

As a method of bonding fibers with a thermoplastic resin, the obtained base paper can be subjected to a surface treatment with a roll having a temperature equal to or higher than the melting point of the thermoplastic resin, hot air, or an infrared heating method.

The partial break of the water-disintegrable paper of the present invention, which is partially cut, is a discontinuous dotted line cut in which the entire cross section of the product is cut, a so-called perforated cut, or a water-insoluble resin. The cut may be a so-called half cut in which only the cut fiber layer is cut. Therefore, when a fiber layer provided with a water-insoluble resin is provided on both surfaces of a fiber layer not provided with a water-insoluble resin,
Similar cuts may be provided on both sides.

 The method of applying this partial cut depends on the strength and water disintegration of the product.
Is determined in terms of That is, the number of partial cuts
If it is provided, the strength of the water-disintegrable paper necessarily decreases. did
Therefore, the number of cuts is limited. Low product strength
If too low, a water-insoluble resin is provided.
What is necessary is just to increase the strength of the fiber layer. Strength of the fiber layer
As a method of increasing the degree, for example, a method of increasing the basis weight,
How to increase the length of fibers used, entanglement of fibers used
Method (beating) or self-adhesive rayon (
For example, Rayon SBH (Daiwa Spinning Co., Ltd.)
Throw.

It is preferable that the partial cuts are formed by dispersing as uniformly as possible from the viewpoint of the water disintegrability of the water disintegrable paper.
FIG. 1 shows an example in which a perforated cut is provided. Of course, the cut is not limited only to the shape to be formed.

Next, the present invention will be described in more detail based on examples. However, the present invention is not limited to such examples, and may be appropriately modified within the scope of the present invention.

Example 1 Beating using a TAPPI standard square sheet machine
30 ゜ SR softwood bleached kraft pulp (hereinafter NBKP (30
(SR)) 8 parts by weight and polyethylene synthetic pulp SWP
0.6 parts by weight of E-400 (Mitsui Petrochemical Industries, Ltd.)
The paper is made by the usual method, and the dry weight is 8.6g / m^TwoWet paper
(A) was produced.

Similarly, wet paper (B) having a dry weight of 70 g / m ² was prepared using softwood bleached kraft pulp (hereinafter referred to as NBKP (free)) that had not been beaten.

The wet paper (A) and the wet paper (B) were overlaid, dehydrated under pressure, and dried to produce a two-layer base paper. 150 of this base paper
Heat treatment was performed using a hot roller at ℃ to obtain a water-disintegrable paper.

The physical properties of the obtained water-disintegrable paper were examined for wet tensile strength, tear length, generation state of paper powder, and water-disintegration by the following methods. Table 1 shows the results.

(Wet tensile strength) After cutting the obtained water-disintegrable paper into strips of 15 mm width and 100 mm length, gently immerse it in distilled water for 10 seconds, take it out, lightly wipe the water with filter paper, and use a universal compression tensile tester. (Shinko Tsushin Kogyo Co., Ltd. TCM-200), tensile speed 10mm / min,
The test was performed under the condition of a test piece gripping distance of 50 mm, and the load instruction value at the time of breaking of the test piece was defined as the tensile strength.

The wet tensile strength is preferably at least 100 g in practical use.

(Tear length) The tear length was measured based on JIS P 8113.

(Paper powder generation state and water disintegration) The water disintegratable paper obtained above was cut into 10 cm x 20 cm, and the surface where the fibers were partially bonded with a water-soluble resin was taken as the upper surface.
After being folded in two to a size of cm × 10 cm, the impregnated amount of distilled water by spraying is 20 to the dry weight of the nonwoven fabric.
After spraying the wet tissue at 0% to obtain a wet tissue, the state of paper dust generation and water disintegration were examined. The paper powder was generated by rubbing the transparent glass plate 10 times with a wet tissue at a pressure of about 70 g / cm ² to check for fiber detachment. The state of paper dust generation was determined based on the following criteria.

A: No detachment of fibers is observed on the glass plate.

B: Detachment of 2 to 3 fibers on the glass plate is observed.

C: Detachment of 5 to 10 fibers on the glass plate is observed.

D: Detachment of 10 to 20 fibers on the glass plate is observed.

E: Many fibers were detached on the glass plate.

Practical appropriate paper dust generation standards are A to C,
On the other hand, D and E judged that the paper dust was not conspicuous.

As shown in Fig. 2, the water disintegration test showed a capacity of 40
The water (2) 30 and one test sample (3) were put in the experimental aeration tank (1), and three diffusers (φ3 mm holes) were provided at the tip of a rubber tube having an inner diameter of 10 mm. After providing a copper tube on the bottom of the experimental aeration tank (1) as shown in FIG.
Vent air (flow rate: 5.0 / min) into the rubber tube (4),
After aeration, the size of the debris after water dissolution is about 30 mm x 30
The time until it became mm or less was measured.

The reason why the size of debris after water disintegration was set to 30 mm × 30 mm or less was to take into account that the function of the simple septic tank would not be impaired at such a size, and that the debris within 180 minutes When the size becomes 30 mm × 30 mm or less, such a function is not hindered.

Comparative Example 1 In Example 1, polyethylene synthetic pulp SWP Use E-400
A paper was prepared in the same manner as in Example 1 except that
Inspect tensile strength, tear length, paper dust generation state and water disintegration
Was. Table 1 shows the results.

Comparative Example 2 1.6 g of commercially available toilet paper (basis weight 20 g / m ² ) was taken and folded to make four sheets, and the wet tensile strength, the breaking length, the generation state of paper powder and the water disintegration were obtained in the same manner as in Example 1. Was examined. Table 1 shows the results.

Comparative Example 3 1.8 g of commercially available tissue paper (basis weight 15 g / m ² ) was taken.
Folding was performed to make five sheets, and the wet tensile strength, the breaking length, the generation state of paper powder, and the water disintegration were examined in the same manner as in Example 1. Table 1 shows the results.

The papers of Comparative Examples 1 and 2 have so many paper dust generation states that they cannot withstand practical use, whereas the water-disintegratable paper of Example 1 hardly generates paper powder and can sufficiently withstand practical use. Was something. In addition, in terms of water disintegration, Example 1 is as long as 100 minutes because the fiber layer without the polyethylene synthetic pulp is dispersed in a fibrous state, and the remaining fiber layer with the polyethylene synthetic pulp is weak due to water flow. This is because it is gradually broken by mechanical force.

Therefore, in the case of the water-disintegrable paper of Example 1, the time required for the fiber layer not provided with the polyethylene synthetic pulp to be dispersed in a fibrous form and for the thin fiber layer provided with the polyethylene synthetic pulp to remain remains as the paper of Comparative Example 1. As in the case of the case, it is extremely short, about 10 minutes, and does not cause blockage of the sewage pipe. In addition, the thin fiber tank provided with polyethylene synthetic pulp is broken into small blocks of 30 mm × 30 mm or less in about 100 minutes due to weak mechanical force such as water flow in the septic tank, impeding the function of the simple septic tank. Nothing to do.

The usefulness of the water-disintegrable paper of the present invention is further clarified especially when compared with the physical properties of the tissue paper of Comparative Example 3.

Examples 2 to 13 and Comparative Examples 4 to 16 A stock having the composition shown in Table 2 was prepared, and a fiber layer (wet paper A) in which the fibers were partially bonded with a water-insoluble resin in the same manner as in Example 1 ) And a fiber layer (wet paper B) in which the fibers are not bonded with a water-insoluble resin are superimposed to produce a paper.
The physical properties were examined in the same manner as described above. Table 2 shows the results.

As can be seen from the above results, the amount of polyethylene synthetic pulp used was set at 0.
A range of 4 to 0.8 g / m ² is appropriate. When the use amount of the polyethylene synthetic pulp is less than 0.4 g / m ² , for example, it is apparent from the physical properties of the papers obtained in Comparative Examples 4, 6, 8, 10 and 12 in which the use amount is 0.2 g / m ^2. As can be seen, the generation of paper dust is large, which is not practical. Also, its usage is 0.
If it exceeds 8 g / m ² , for example, as is apparent from the physical properties of the papers obtained in Comparative Examples 5, 7, 9, 11, and 13, it is necessary for the water disintegration test to disintegrate to a size of 30 mm × 30 mm or less. It takes more than 300 minutes, the water disintegration is extremely poor, and the function of the simple septic tank may be hindered. Of course, the water disintegration test adopted was a method performed on January 14, 1981, based on the notice of Kansei No. 6 issued by the Ministry of Health and Welfare, and the water disintegration test under extremely weak stirring was conducted. a is, the amount of polyethylene synthetic pulp under high agitation than this condition be one more than 0.8 g / m ² 3
Some fragments of 0 mm x 30 mm or less easily disintegrate.

 For example, in Example 1, polyethylene synthetic pulp SWP E
2.0 g / m for -400^TwoAnd change the amount of other fibers used
Paper (10cm x 20cm) made without water in one cylinder
Add with 500ml, cover the mouth of the cylinder with wrap
Shake up and down several times to easily break 30mm x 30mm or less.
Dissolve in pieces. However, in practice, sewage piping, simple
Since such a strong force does not occur in the septic tank,
The test standard is 30mm x 30mm or less within 180 minutes by this test method
It seems appropriate to break down to the size of
It is.

Next, the basis weight of the fiber layer provided with the water-insoluble resin, that is, the thermoplastic polyethylene synthetic pulp, is suitably in the range of 5 to 40 g / m ² . That is, as described above, in the present invention, it is preferable that the basis weight of the fiber layer is small, but if the basis weight is 5 g / m ² or less in practice, a portion where no fiber is deposited may occur in the papermaking process. Is not preferred. On the other hand, when the basis weight exceeds 40 g / m ² , the water disintegration becomes poor as seen in Comparative Examples 14, 15, and 16. The paper of Comparative Example 14 is excellent in water disintegration, but generates somewhat more paper dust.
This is because the amount of polyethylene synthetic pulp used is smaller than the amount of NBKP (30 ゜ SR) used. These facts differ from the conventional wet-laid paper using conventional polyethylene synthetic pulp in a point which is particularly important in the present invention.

For example, JP-A-48-64204 and JP-B-53-46323 disclose two-layer or three-layer wet-bonded paper using polyethylene synthetic pulp. Neither does not satisfy the water disintegration required in the present invention, and even if it is made by reducing the amount of polyethylene synthetic pulp used, as described above, especially basis weight has a significant effect It can be seen that these are different from those disclosed in these publications.

Example 14 In the same manner as in Example 1, 8 parts by weight of NBKP (30 ° SR) and poly
Ethylene synthetic pulp SWP E-400 0.6 parts by weight of mixed stock
Paper, dry weight is 8.6g / m^TwoTwo wet papers (A)
And wet paper (C). Also, using only NBKP (free)
Dry weight is 70g / m as above^TwoWet paper (B)
Made. Next, place wet paper (A), (B) and (C) on top.
And then dry after processing to produce a three-layer base paper.
Made. This base paper is heat treated with a 150 ° C hot roller.
Then, a water-disintegrable paper was produced.

 Table 3 shows the physical properties of the water-disintegrable paper.

The water-disintegrable paper obtained in Example 14 has a slightly slower water-disintegration property than the water-disintegrable paper obtained in Example 1. This is because in the case of the water-disintegrable paper of Example 14, the sample is divided into two from the middle layer, that is, the wet paper (B), and that time is required.

Example 15 In the same manner as in Example 1, 8 parts by weight of NBKP (30
Ethylene synthetic pulp SWP E-400 1.0 parts by weight of mixed stock
Paper, dry weight 9g / m^TwoOf wet paper (A) was prepared.
Also, using NBKP (free), the dry weight is similarly 70 g / m^TwoWet
Paper (B) was produced. Next, wet paper (A) and wet paper (B)
Laminate, pressurize and dry to produce a two-layer base paper
Was. This base paper is heat-treated with a hot roller at 150 ° C.
Further, a water-disintegrable paper was prepared by making partial cuts.

The perforations shown in FIG. 1 were provided as partial cuts. Table 3 shows the physical properties of the water-disintegrable paper.

A test piece for measuring the wet tensile strength was prepared by cutting it into a size of 15 mm × 100 mm as shown in FIG.
For comparison, the results measured using the unperforated paper of Comparative Example 7 are also shown in Table 3.

Example 16 In Example 13, the wet paper (B) was weighed with NBKP (free) 7 weight.
Part and hollow flat rayon SBH (1.5 denier X 7mm (Yamato
Spinning Co., Ltd.) 3 parts by weight dry weight 70g / m^TwoWet paper
In the same manner as in Example 13, a water-disintegrable paper was produced.

 The results are shown in Table 4.

As can be seen from the above results, by making partial cuts in advance, the amount of polyethylene synthetic pulp used can be increased, so that there is no generation of paper dust,
In addition, a water-disintegrable paper which can satisfy the water-disintegrability is obtained. Moreover, as can be seen from the results of Example 14, the fiber layer in which the water-insoluble resin is not provided is a fiber that brings out the wet tensile strength, in this case, by using hollow flat rayon, it is sufficiently practical. It can be seen that the present invention can be applied to a water-decomposable wet tissue having endurable strength.

Examples 17 to 19 and Comparative Examples 17 and 18 A fiber layer (wet paper (A)) in which fibers were partially adhered to a stock having the composition shown in Table 5 with a water-insoluble resin in the same manner as in Example 15. Then, a fiber layer (wet paper (B)) in which the fibers were not bonded with a water-soluble resin was superimposed to produce a paper, and a partial cut was made to produce a paper, and the physical properties were measured. Table 5 shows the results.

From the above results, it can be seen that when a partial cut is made, the amount of the polyethylene synthetic pulp to be used is suitably in the range of 0.4 to 1.2 g / m ² .

Example 20 In the same manner as in Example 1, 8 parts by weight of NBKP (30 ° SR) and
Ethylene synthetic pulp SWP E-400 1.0 parts by weight of mixed stock
Paper, dry weight 9g / m^TwoWet paper (A) and (C)
Was prepared. Similarly, using NBKP (free), dry weight
70g / m^TwoOf wet paper (B) was prepared. Next to wet paper
(A), (B) and (C) are superimposed in order from the top,
After pressing, drying was performed to produce a base paper having a three-layer structure. 15 this base paper
Heat-treated with a hot roller at 0 ° C and cut further partially
An eye was applied to produce a water-disintegrable paper.

Note that partial cuts were made in the same manner as in Example 15.

 Table 6 shows the physical properties of the water-disintegrable paper.

Example 21 Polyethylene synthetic pulp SWP used in Example 1 E-4
Polypropylene synthetic pulp partex instead of 00
Same as in Example 1 except that (Lexstar) was used.
To make paper, wet tensile strength, tear length, generation of paper dust
The condition and water disintegration were examined. The base paper is heated at 160 ° C.
Heat treatment.

 Table 7 shows the results.

Example 22 The water-disintegrable paper obtained in Example 1 was cut into 10 cm × 20 cm,
This is adjusted so that the surface on which the water-insoluble resin is
The sheet was folded in two to a size of cm × 10 cm, and further impregnated with the aqueous solution shown in Table 9 at a ratio of 200% with respect to the dry weight of the paper to prepare a wet tissue.

The suitability test of this wet tissue was performed using the flush toilet shown in FIG. 4 according to the following measuring method and measuring conditions.

(Measurement method) Toilet (JIS A 5207: C316) (7) and 500 of the toilet (7)
mm with the low tank (5) provided above the cock (1
1) Polyvinyl chloride pipe with inner diameter of 32 mm (6)
The bottom of the toilet (7) is connected to a transparent polyvinyl chloride pipe (8) having an inner diameter of 75 mm and an inner diameter of 100/100 at a gradient of 1/100.
Connect to the septic tank (10) with a clear polyvinyl chloride pipe (9).

Next, the sample (wet tissue 5) is placed in the toilet (7).
The cock (11) is opened, the tap water 10 in the low tank (5) flows down, and the flowability of the sample in the pipes (8) and (9) is observed.

(Measurement conditions) Water flow rate: 10 times / number of test pieces: 5 sheets / time Number of tests: 50 times The results are shown in Table 8.

For reference, commercially available toilet paper (basis weight: 20g)
/ m ² ) in the same manner as in Example 22.
The results are shown in Table 8.

[Effects of the Invention] The water-disintegratable nonwoven fabric of the present invention has sufficient strength even in a wet state when used, but it dissolves when immersed in a large amount of water, so that it may cause blockage in a sewer pipe or a simple septic tank. It does not interfere with the function of the product at all.

In addition, the water-disintegratable nonwoven fabric of the present invention is made of a material that is safe for the human body, and furthermore, since there is no generation of paper dust when wet, wet tissue, dry tissue, hand wipe,
Cleaning cloths, etc .; pants, diapers, etc. used in hospitals and the like; sterilization and the addition of a disinfectant can be applied to various products including surgery, food gloves, hats, etc. Play.

[Brief description of the drawings]

FIG. 1 is a plan view showing the shape of a cut formed in the water-disintegratable nonwoven fabric of the present invention, FIG. 2 is an explanatory diagram of a test method for water-disintegration of a test piece used in an embodiment of the present invention, and FIG. FIG. 4 is a plan view showing the shape of a test piece used in the embodiment of the invention, and FIG. 4 is a diagram of a flush toilet facility in a flow test of the wet tissue used in the embodiment 22. (Signs in the drawings) (1): Experimental aeration tank (2): Water (3): Test sample (4): Rubber tube (5): Low tank (6): Polyvinyl chloride pipe (7): Toilet bowl (8), (9): Transparent polyvinyl chloride pipe (10): Septic tank (11): Cook

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Teruhisa Miki 156 Kawanoe-cho, Kawanoe-shi

Claims (5)

(57) [Claims] 1. A water-disintegratable paper comprising a fiber layer in which fibers are partially bonded with a water-insoluble resin, on one or both sides of a fiber layer in which the fibers are not bonded with a water-insoluble resin. 2. The water-disintegratable paper according to claim 1, wherein the water-insoluble resin is a thermoplastic synthetic pulp, and the amount of the resin is 0.4 to 1.7 g / m ² . 3. A water disintegrating device according to claim 1, wherein said paper obtained by laminating a fiber layer in which said fibers are partially bonded with a water-insoluble resin is partially cut. Nature paper. 4. The water-disintegrable paper according to claim 1, wherein the water-insoluble resin is a thermoplastic polyolefin synthetic pulp. 5. A fiber layer in which fibers are partially adhered with a water-insoluble resin is made of paper pulp, and the basis weight of the fiber layer is 4%.
4. The water-disintegrable paper according to claim 1, wherein the water-disintegrable paper has a weight of 40 g / m ² .