JP6313630B2 - Wet sheet - Google Patents

Description

  The present invention relates to a wet sheet.

  Wet sheets such as disposable toilet cleaners used for toilet cleaning are required to have good wiping properties, strength that does not break even when wet, and water-solubility or water-solubility that can be passed to the toilet.

  Conventionally, PVA (polyvinyl alcohol) or CMC (carboxymethylcellulose) as a paper strength enhancer has been incorporated into paper (internal addition) or sprayed on the base paper to obtain a wet sheet that does not break even when wet. A corresponding crosslinking agent is added when coating / coating or impregnation with a chemical solution (for example, see Patent Documents 1 and 2).

Japanese Patent No. 4301996 Japanese Patent No. 4052991

  However, in the prior art, there is a problem that PVA and CMC are not uniformly applied to the base paper and sufficient strength cannot be obtained.

  An object of the present invention is to provide a wet sheet having higher strength.

In order to solve the above problem, the wet sheet of the invention according to claim 1,
A water-degradable film is sandwiched between a plurality of water-decomposable or water-soluble sheets, and impregnated with a predetermined chemical solution that crosslinks with the water-degradable film ,
The water-decomposable film is
A mesh having a film extending in one direction and a film extending in the other direction perpendicular thereto;
The thickness is 100 μm to 500 μm,
At least one or more intersections of a film extending in the one direction and a film extending in the other direction within a square of 25 mm in the one direction and 25 mm in the other direction Exists .

The invention according to claim 2 is the invention according to claim 1 ,
The water-decomposable film is made of polyvinyl alcohol or carboxymethyl cellulose.

  According to the present invention, since a water-decomposable film is sandwiched between a plurality of water-decomposable or water-soluble sheets, it is possible to provide a wet sheet having higher strength than conventional ones. Moreover, by making the water-decomposable film into a mesh shape, the same unevenness as the embossing can be formed on the surface without embossing, and a wet sheet that does not require embossing can be provided.

It is a top view of the toilet cleaner in this embodiment. It is sectional drawing in the II-II line of FIG. It is a figure which shows typically the mode of manufacture of a toilet cleaner. It is a figure which shows the example of the shape pattern of a water-decomposable film. It is a figure which shows the example of arrangement | positioning of the cross part of a water-decomposable film.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
The use of the wet sheet according to the present invention is not particularly limited, and includes, for example, one used for cleaning human skin. In the following embodiments, the wet sheet is a toilet. The case of being a cleaner will be described as an example.

[Composition of toilet cleaner 1]
First, the structure of the toilet cleaner 1 in the embodiment of the present invention will be described.
FIG. 1 is a plan view of the toilet cleaner 1, and FIG. 2 is a view showing a II-II cross section of the toilet cleaner 1. FIG. 3 is a diagram schematically illustrating a state of manufacturing the toilet cleaner 1.
As shown in FIGS. 2 and 3, the toilet cleaner 1 has a water-decomposable film 3 sandwiched between two sheets 2 and 2 and is ply-processed (laminated). The film 3 is impregnated with a predetermined chemical solution that crosslinks.

  The seat 2 is composed of a water-decomposable or water-soluble fiber assembly so that it can be discarded as it is in a toilet bowl after the toilet is cleaned. As the fiber assembly, natural fiber, synthetic fiber, fiber mixed with these, or the like can be used, and is not particularly limited as long as it is a fiber assembly having water decomposability or water solubility. Suitable raw material fibers include cellulose fibers such as wood pulp, non-wood pulp, rayon and cotton, and biodegradable fibers made of polylactic acid.

  The water-decomposable film 3 is obtained by forming a water-degradable film such as PVA or CMC, which is a component serving as a binder, into a mesh shape. By sandwiching the water-decomposable film 3, the strength of the toilet cleaner 1 can be improved by crosslinking the water-degradable film 3 and a chemical solution (boric acid, metal ions, etc.). Moreover, since the sandwiched water-decomposable film 3 has a mesh shape, the surface can be provided with unevenness without embossing, and the toilet cleaner 1 having good wiping property can be provided.

The thickness of the water-decomposable film 3 is preferably 100 μm to 500 μm. When it is 100 μm or less, the surface of the sheet 2 after ply cannot be formed with unevenness that can exhibit the same wiping property as embossing, and when it is 500 μm or more, the same effect as embossing can be obtained. This is because the ply cannot be made but the processing suitability is poor.
In order to make the unevenness stand out, it is preferable that the water-decomposable film 3 is sandwiched between the sheets 2 and then pressed with an elastic roller.

  As a method of forming the water-disintegratable film 3 into a mesh shape, for example, a method of forming a combination of a plurality of water-disintegrable films such as PVA and CMC formed into a thin string shape, punching holes in a sheet-like water-disintegratable film For example, a method of forming with a gap.

The example of the water-decomposable film 3 is shown to Fig.4 (a), (b). In addition, in FIG. 3, FIG. 4, although the dot pattern is attached | subjected to the water-decomposable film 3 in order to express the shape of the water-degradable film 3 clearly, the water-degradable film 3 may be transparent, It may have a color or pattern.
As shown in FIG. 5, the mesh shape of the water-decomposable film 3 is, for example, at least one cross portion (a portion where the films in two directions intersect each other in a square of 25 mm × 25 mm. It is preferable to have. For example, when there is no crossed part in a 25 mm × 25 mm square and there is a film only in CD (Cross Direction), the tensile strength in the CD direction can be improved, but force is applied in the MD (Machine Direction) direction. It becomes easy to tear. However, if there are one or more cross portions, it is difficult to break in either the CD (Cross Direction) direction or the MD (Machine Direction) direction, and a strong tensile strength can be obtained.

  Depending on the hardness of the water-decomposable film 3, the wiping property of the toilet cleaner 1 can be changed. When the water-decomposable film 3 is soft, it can be easily wiped along the shape of the object to be wiped, and when it is hard, the strength in the CD and MD directions increases, so that it can be made difficult to tear.

  As the chemical solution impregnated in the toilet cleaner 1, a chemical solution that crosslinks the water-degradable film 3, for example, boric acid as a paper strength enhancer, metal ions, etc., ethanol, methanol, propanol, butanol, glycerin as a water-soluble solvent, One or several kinds of alcohols such as sorbitol, glycols such as ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, and hexylene glycol can be appropriately selected and used. In addition, surfactants such as anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants, and auxiliary agents such as bactericides, disinfectants, deodorants, preservatives, etc. It can also be contained appropriately.

[Operation of toilet cleaner 1]
As described above, the toilet cleaner 1 has a predetermined structure in which the water-decomposable film 3 such as PVA or CMC is sandwiched between the two sheets 2 that are water-degradable fiber aggregates and crosslinks with the water-degradable film 3. The structure is impregnated with a chemical solution. Accordingly, the water-decomposable film 3 that is plyed between the sheets 2 serves as a binder (adhesive) and has an effect as a reinforcing agent, so that it is possible to prevent sheet tearing that occurs during manufacturing. Moreover, it is hard to tear with respect to up / down / left / right movements during wiping. Furthermore, ply peeling can be prevented.
Moreover, since the sandwiched water-decomposable film 3 has a mesh shape, the surface can be provided with unevenness without embossing, and the toilet cleaner 1 having good wiping property can be provided.

  In addition, when a conventional toilet cleaner manufactures a base paper (sheet), PVA or CMC as a paper strength enhancer must be internally added or applied / coated. Since it is only necessary to sandwich the water-decomposable film 3 in the (sheet 2), it can be used even if it is not a dedicated base paper (for example, a toilet paper base paper). Moreover, since the embossing is not necessary for the manufacture of the toilet cleaner 1, it is not necessary to introduce new equipment such as an embossing roll, and it is possible to perform the processing with existing equipment. Furthermore, it is possible to manufacture by changing the water-decomposable film 3 without changing the embossing roll for each product.

  As described above, the toilet cleaner 1 is configured such that the water-decomposable film 3 is sandwiched between a plurality of water-degradable sheets 2 and impregnated with a predetermined chemical solution that crosslinks the water-degradable film 3. Therefore, since the film is sandwiched between the plurality of sheets 2, a toilet cleaner having higher strength than conventional can be provided. Moreover, since the water-decomposable film 3 has a mesh shape, the same unevenness as the embossing can be formed on the surface without embossing, and a toilet cleaner that does not require embossing can be provided.

  In addition, this invention is not restricted to the thing of above-described embodiment, In the range which does not deviate from the summary, it can change suitably.

  For example, in the above-described embodiment, the case where the water-decomposable film 3 is sandwiched between the two sheets 2 has been described as an example. However, the water-decomposable film 3 may be sandwiched between the plurality of sheets 2. The number of sheets 2 is not limited to two.

  Moreover, in the said embodiment, although demonstrated taking the case where the water-decomposable film 3 was a mesh form, even if the water-degradable film 3 is not a mesh form, providing the wet sheet excellent in intensity | strength than before. Can do.

  Moreover, in the said embodiment, although the case where the wet sheet | seat which concerns on this invention was applied to the toilet cleaner was demonstrated as an example, the use is not specifically limited, For example, it is used in order to wash | clean human skin. It may be applied to wet sheets and kitchen cleaners.

  In addition, the detailed configuration of the toilet cleaner 1 can be changed as appropriate without departing from the spirit of the present invention.

1 Wet sheet 2 Sheet 3 Water disintegratable film

Claims (2)

A water-degradable film is sandwiched between a plurality of water-decomposable or water-soluble sheets, and impregnated with a predetermined chemical solution that crosslinks with the water-degradable film ,
The water-decomposable film is
A mesh having a film extending in one direction and a film extending in the other direction perpendicular thereto;
The thickness is 100 μm to 500 μm,
At least one or more intersections of a film extending in the one direction and a film extending in the other direction within a square of 25 mm in the one direction and 25 mm in the other direction An existing wet sheet. The wet sheet according to claim 1 , wherein the water-decomposable film is made of polyvinyl alcohol or carboxymethyl cellulose.

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