JP6400253B2 - Wet sheet for cleaning and method for manufacturing wet sheet for cleaning - Google Patents

Description

  The present invention relates to a cleaning wet sheet and a method for manufacturing a cleaning wet sheet.

  Conventionally, a wet sheet for cleaning in which a sheet material is impregnated with a chemical is known. Some of these wet sheets for cleaning are formed of a plurality of layers. The inner layer is provided with hydrophilic fibers such as rayon, the outer layer is provided with hydrophobic fibers such as polypropylene, and the inner layer hydrophilic fibers are treated with a chemical solution. (For example, Patent Document 1).

Japanese Patent No. 4033612

However, since the surface of the cleaning wet sheet described in Patent Document 1 is wet, for example, when cleaning the floor, the frictional resistance with the floor surface is large, and a large load is required to slide the floor surface. And For this reason, there is a problem that a load is applied to the cleaning wet sheet, and the impregnated chemical solution is excessively discharged, and the floor surface becomes sticky.
In addition, there is a problem that, immediately after the start of use, the chemical liquid is excessively discharged, so that the wet sheet for cleaning falls short of the chemical liquid, and the floor surface cannot be sufficiently cleaned.
In addition, in order to avoid excessive release of chemicals, some have high viscosity as chemicals, but by using high viscosity chemicals, the floor becomes sticky with high viscosity chemicals, and vice versa. In addition, there is a problem that the release stability of the chemical solution is lowered.

  The subject of this invention is providing the manufacturing method of the wet sheet | seat for cleaning which can suppress the excessive discharge | release of a chemical | medical solution, and a cleaning wet sheet | seat even if it uses a low viscosity chemical | medical solution.

In order to solve the above problems, the invention described in claim 1 is a cleaning wet sheet composed of a plurality of layers and impregnated with a chemical solution, and a hydrophobic fiber layer provided on each of the front surface and the back surface, and these A hydrophilic fiber layer provided in an intermediate layer sandwiched between the hydrophobic fiber layers, an entangled portion where the hydrophobic fiber layer and the hydrophilic fiber layer are entangled, the hydrophobic fiber layer and the hydrophilic fiber A non-entangled part that is not entangled with the layer, the hydrophilic fiber layer is impregnated with a chemical solution, the basis weight of the hydrophilic fiber layer is 10-50 g / m ² , and the cleaning a 10-60% of the mass of use wet sheet total amount was measured according to the horizontal method JIS-P8147, static friction resistance value in a direction wiping the cleaning surface of the wet sheet for the cleaning rather smaller than the dynamic friction resistance The static in the wiping direction And the frictional resistance is less than 500 cN, the frictional resistance ratio of the dynamic friction resistance and the static friction resistance (static frictional resistance / dynamic friction resistance), characterized in that it is 0.7 or less.

According to the first aspect of the present invention, in the wet sheet for cleaning, the basis weight of the hydrophilic fiber layer is 10-50 g / m ² , so that the chemical liquid is suitably held by the hydrophilic fiber layer and the cleaning wet sheet is used. By adjusting the ratio of the contact surface to the surface to be cleaned of the wet sheet for cleaning formed by the entangled part and the non-entangled part, the mass is 10-60% of the total amount of the wet sheet. The static friction resistance value in the wiping direction on the cleaning surface of the cleaning wet sheet, measured according to the horizontal method of -P8127, can be made smaller than the dynamic friction resistance value.
Accordingly, even when a low-viscosity chemical solution is used, it is not necessary to apply a large load to the initial movement when wiping with a cleaning wet sheet, and excessive release of the chemical solution can be suppressed.
In particular, since the friction resistance ratio (static friction resistance value / dynamic friction resistance value) in the wiping direction on the cleaning surface of the cleaning wet sheet is 0.7 or less, the cleaning wet sheet is used at the start of sliding at the start of wiping. The applied load can be reduced.
For this reason, the chemical solution is not excessively discharged to the surface to be cleaned, and there is no fear that the chemical solution is insufficient and cannot be sufficiently cleaned.

  According to a second aspect of the present invention, in the wet sheet for cleaning according to the first aspect, the entangled portion is formed at an area ratio of 23 to 80% with respect to a surface area in a plan view of the front surface or the back surface. It is characterized by that.

  According to the invention described in claim 2, it is of course possible to have the same effect as that of the invention described in claim 1, and in particular, the entangled portion is formed with an area ratio of 23-80% with respect to the surface area in plan view. Therefore, the frictional resistance value of the cleaning wet sheet can be set to a better value. For this reason, it can wipe with more moderate load and can discharge | release a chemical | medical solution moderately.

  According to a third aspect of the present invention, in the cleaning wet sheet according to the first or second aspect, the entangled portion extends in a direction substantially perpendicular to the wiping direction of the cleaning wet sheet. And

  According to the third aspect of the invention, it is of course possible to obtain the same effect as that of the first or second aspect of the invention, and in particular, since the entangled portion extends perpendicularly to the wiping direction. Further, the surface of the cleaning wet sheet that is spaced from the surface to be cleaned can be formed so as to extend perpendicularly to the wiping direction, and excessive release of the chemical solution can be suppressed.

  According to a fourth aspect of the present invention, in the cleaning wet sheet according to the third aspect, the entangled portions and the non-entangled portions are alternately and continuously formed along the wiping direction.

  According to the invention described in claim 4, it is of course possible to obtain the same effect as that of the invention described in claim 3. In particular, the entangled part and the non-entangled part are alternately continuously arranged along the wiping direction. Since it forms, a several entangled part and a non-entangled part can be made to contact a to-be-cleaned surface alternately continuously, and the excessive discharge | release of a chemical | medical solution can be suppressed more favorably.

The invention according to claim 5 is the wet sheet for cleaning according to any one of claims 1 to 4 , wherein the hydrophobic fiber layer contains hydrophobic fibers in a weight ratio of 50 to 100%. It is characterized by being.

According to the invention described in claim 5, it is needless to say that the same effect as in the invention described in any one of claims 1 to 4 can be obtained. In particular, the weight of the hydrophobic fiber layer is 50-100%. Since the hydrophobic fibers are contained in a ratio, it is possible to suitably realize the holding of the chemical solution impregnated in the hydrophilic fiber layer and the adjustment of the discharge amount.

The invention according to claim 6 is the cleaning wet sheet according to any one of claims 1 to 5 , wherein the hydrophobic fiber layer has a blending ratio of polyethylene terephthalate fibers of 80% or more, and the polyethylene terephthalate The fiber diameter is 3.3 dtex or more.

According to the invention described in claim 6, it is of course possible to have the same effect as that of the invention described in any one of claims 1 to 5 , and in particular, fibers of polyethylene terephthalate fibers constituting the hydrophobic fiber layer. Since the diameter is 3.3 dtex or more, the rigidity (cushioning property) of the fiber is improved, and it can be operated even with a light force. Further, the polyethylene terephthalate fiber having a thick fiber diameter of 3.3 dtex or more secures a gap between fibers, hardly causes a capillary phenomenon, and can prevent the chemical solution from flowing from the inner layer to the outer layer.

The invention of claim 7, wherein, there is provided a method for producing a cleaning wet sheet to produce a cleaning wet sheet according to any one of claims 1 6, in that the entangled portions are formed by hydroentangling Features.

According to the invention of claim 7 , since the entangled portion is entangled by hydroentanglement, the hydrophilic fiber layer and the hydrophobic fiber layer can be entangled without using an adhesive or the like, and a simple configuration is provided. In addition, it is possible to avoid uneven wiping caused by the adhesive blocking the discharge surface of the chemical solution.

  According to the present invention, the cleaning wet sheet and the manufacturing method of the cleaning wet sheet can suppress the excessive release of the chemical liquid even when using the low viscosity chemical liquid, and can increase the area that can be wiped while discharging the chemical liquid. .

It is a model perspective view which shows the wet sheet | seat for cleaning in embodiment which concerns on this invention. It is a schematic cross section which shows the wet sheet | seat for cleaning in embodiment which concerns on this invention. It is a model exploded perspective view showing the wet sheet for cleaning in the embodiment concerning the present invention. It is a schematic diagram which shows the patterning of the wet sheet | seat for cleaning in embodiment which concerns on this invention.

  Hereinafter, a cleaning wet sheet according to an embodiment 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.

  A cleaning wet sheet according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 to 4, the cleaning wet sheet 1 includes an inner layer 2 as a hydrophilic fiber layer and an outer layer 3 as a hydrophobic fiber layer.
The inner layer 2 is an intermediate layer sandwiched between outer layers 3 described later, and is mainly formed of hydrophilic fibers, and the hydrophilic fibers are impregnated with a chemical solution.
The inner layer 2 is formed so as to have a basis weight of 10-50 g / m ² and occupies a weight ratio of 10-60% with respect to the total weight with the outer layer 3 described later.
The basis weight is 10-50 g / m ² and the mass is set to 10-60% of the total amount of the cleaning wet sheet because, if the basis weight is smaller than the above condition, the retention of the chemical solution is not secured. On the other hand, if the basis weight is larger than the above conditions, the amount of the chemical solution and the weight of the sheet become heavy, and the wiping feeling and handling become heavy.
As the hydrophilic fiber, natural fibers such as pulp, cotton and hemp, and cellulosic chemical fibers such as rayon and acetate are applied, but it is preferable to apply pulp from the viewpoint of maintaining water retention. .
Moreover, although it is preferable to comprise the inner layer 2 only with a hydrophilic fiber, the hydrophobic fiber may contain suitably.

The chemical solution is used as a cleaning detergent for the cleaning wet sheet 1 and is released from the front surface or the back surface through the outer layer 3 described later. Moreover, the chemical | medical solution is prepared so that a viscosity may be set to 1-15 mPa * s in 25 degreeC. The viscosity is measured using a Brookfield (B type) rotational viscometer (model number: LVDV-I +), and the rotor used and the number of rotations are appropriately changed according to the viscosity of the aqueous detergent. The measurement conditions are 25 ° C., the rotation speed is 60 rpm, and the method is carried out according to JIS K 7117-1: 1999.
In addition, as a chemical | medical solution, what dissolved lower alcohol, such as ethanol, surfactant and disinfectants, such as benzalkonium chloride, and propylene glycol monomethyl ether (PGME) is mentioned as an example.

The outer layer 3 is a layer that forms the surface layer and the back surface layer of the cleaning wet sheet 1, and is mainly formed of hydrophobic fibers. Specifically, the hydrophobic fiber is contained in a weight ratio of 50 to 100% with respect to the total weight of the outer layer 3. As the hydrophobic fiber, a chemical fiber mainly composed of polyethylene terephthalate, polypropylene, polyethylene or the like is applied. The blending ratio of the polyethylene terephthalate fiber is preferably 80% or more, and the fiber diameter is preferably 3.3 dtex or more.
By setting the fiber diameter to 3.3 dtex or more, the rigidity (cushioning property) of the fiber is improved and the operation can be performed with a light force. Further, the polyethylene terephthalate fiber having a thick fiber diameter of 3.3 dtex or more secures an inter-fiber gap, prevents a capillary phenomenon from occurring, and prevents the chemical solution from flowing from the inner layer 2 to the outer layer 3.
The outer layer 3 includes an entangled portion 31 and a non-entangled portion 32.

The entangled portion 31 is a place where the inner layer 2 and the outer layer 3 are integrated by tangling the respective fibers. Moreover, as a method of entanglement of the entanglement part 31, for example, water entanglement is adopted. Specifically, the entire layer 2 and the outer layer 3 are integrated by applying water at a weak water pressure of less than 20 kPa over the entire surface, and the inner layer 2 and the outer layer 3 are integrated. By entanglement, a shape having uneven patterning is formed.
Further, the water entanglement is performed by applying water from both sides to the same portion of the front surface layer and the back surface layer of the cleaning wet sheet 1. In other words, the entangled portion 31 is formed in such a manner that the uneven patterning is performed in the same place in the front surface layer and the back surface layer.
Since the interlaced portion 31 is subjected to hydroentanglement, the fibers of the inner layer 2 and the outer layer 3 are intertwined, and the fiber density is higher than the non-entangled portion 32 described later. For this reason, the hydrophobic fiber forming the entangled portion 31 does not have a spatial degree of freedom as compared with the non-entangled portion 32, and each fiber is compared with the non-entangled portion 32 during the wiping operation. It is designed not to move freely.
Further, the entangled portion 31 has a concave shape with respect to the non-entangled portion 32 because the fiber density is higher than that of the non-entangled portion 32. In other words, the entangled portion 31 includes a bottom portion 311 that is the bottom of the recess, and an inclined portion 312 that is an inclined surface that connects the non-entangled portion 32 and the bottom portion 311 described later.

When the cleaning wet sheet 1 is used, the entangled portion 31 extends along a direction (MD direction) perpendicular to the direction of the wiping direction (CD direction) on the cleaning surface of the cleaning wet sheet. Yes.
Here, the wiping direction on the cleaning surface of the cleaning wet sheet is a direction perpendicular to the longitudinal direction of the jig body when the cleaning wet sheet is mounted on a predetermined jig, and is in the moving direction during cleaning. It is the direction along.
Further, the entangled portions 31 are formed in a plurality of rows separated by a predetermined interval. These entangled portions 31 are formed so as to have an area ratio of 23 to 80% in a plan view with respect to the area of the front surface or the back surface of the wet sheet 1 for cleaning. Here, the area ratio indicates the ratio between the entangled surface A that is the surface area in the plan view of the entangled portion 31 and the non-entangled surface B that is the surface area in the plan view of the non-entangled portion 32. It is calculated by the following formula.
Area ratio (%) = A / (A + B) × 100 (Formula 1)

The non-entangled portion 32 is a place where the inner layer 2 and the outer layer 3 are subjected only to pre-entanglement and are not subjected to hydroentanglement.
In addition, the non-entangled portion 32 is not subjected to hydroentanglement, so the fiber density is lower than that of the entangled portion 31, and the fibers in this place are compared with the fibers of the entangled portion 31 during the wiping operation. It can move freely.
The entangled portions 31 and the non-entangled portions 32 are alternately provided along the wiping direction, and only the non-entangled portion 32 is initially in contact with the surface to be cleaned.
Note that the pre-entanglement is not included in the hydroentanglement process. That is, only the process of performing fiber entanglement by applying water at high water pressure after pre-entanglement is regarded as hydroentanglement. For this reason, the non-entangled part 32 to which only pre-entanglement is applied is treated as a part that is not entangled for convenience, although it is slightly fiber-entangled by pre-entanglement.

The cleaning wet sheet 1 is measured according to the horizontal method (described later) of JIS-P8147, compared with the case where the entangled portion 31 is not provided, and the static friction resistance value and the dynamic friction of the cleaning surface of the cleaning wet sheet. The resistance value is reduced. The static friction resistance value is smaller than the dynamic friction resistance value.
That is, the entangled portion 31 has a shape in which the fiber density is higher than that of the non-entangled portion 32 and is recessed with respect to the non-entangled portion 32. Therefore, at the initial stage of wiping the surface to be cleaned, The contact area of the cleaning wet sheet to the surface is reduced. In addition, since the inner layer 2 is composed of hydrophilic fibers, the chemical solution can be suitably held. Therefore, since the frictional resistance value when wiping the surface to be cleaned with the cleaning wet sheet 1 is small, a light wiping comfort can be obtained. Further, the static frictional resistance value in the wiping direction of the cleaning wet sheet 1 is obtained. Is less than 500 cN and the static friction resistance value is smaller than the dynamic friction resistance value (specifically, the friction resistance ratio ((static friction resistance value / dynamic friction resistance value) is 0.7 or less). The load at the beginning of wiping is small.
In addition, since a frictional resistance value differs in MD direction and CD direction of the wet sheet | seat 1 for cleaning, the comparison of a static frictional resistance value and a dynamic frictional resistance value becomes a comparison in the same direction.

According to the present embodiment, in the cleaning wet sheet 1, the hydrophilic fiber layer 2 has a basis weight of 10-50 g / m ² and a mass of 10-60% of the total amount of the cleaning wet sheet 1. The chemical solution is suitably held by the hydrophilic fiber layer, and is formed by the entangled portion 31 and the non-entangled portion 32, the separation surface and the contact surface of the cleaning wet sheet, and the hydrophilic fiber layer 2. The static friction resistance value in the wiping direction on the cleaning surface of the cleaning wet sheet 1 can be made smaller than the dynamic friction resistance value due to the retention effect of the chemical solution by the hydrophilic fiber.
Accordingly, even when a low-viscosity chemical solution is used, it is not necessary to apply a large load to the initial movement when wiping with a cleaning wet sheet, and excessive release of the chemical solution can be suppressed.

Moreover, according to this embodiment, since the entangled part 31 is formed with an area ratio of 23-80% with respect to the surface area in plan view of the front and back surfaces, friction in the wiping direction on the cleaning surface of the wet sheet for cleaning 1 is achieved. The resistance value can be set to a better value.
That is, when the entangled portion 31 is less than 20% with respect to the surface area in plan view of the front and back surfaces, the contact surface at the time of initial movement increases and the static frictional resistance value increases. On the other hand, if it exceeds 50%, the ratio of the entangled portion 31 having a high fiber density contacting the cleaning surface at the time of cleaning increases, so that the dynamic friction resistance value increases. For this reason, by setting the area ratio of the entangled portion 31 within the above range, it can be wiped with an appropriate load, and the chemical solution can be released appropriately.

  Moreover, according to this embodiment, since the entanglement part 31 is extended perpendicularly to the wiping direction, the contact surface to the surface to be cleaned and the separation surface of the cleaning wet sheet 1 are alternately cleaned. And excessive release of the chemical solution can be suppressed.

  Moreover, according to this embodiment, since the entangled part 31 and the non-entangled part 32 are formed alternately and continuously along the wiping direction, the plurality of entangled parts 31 and the non-entangled part 32 are alternately continued. Can be brought into contact with the surface to be cleaned, and excessive release of the chemical solution can be more effectively suppressed.

Moreover, according to this embodiment, since the frictional resistance ratio (static frictional resistance value / dynamic frictional resistance value) in the wiping direction on the cleaning surface of the cleaning wet sheet 1 is 0.7 or less, sliding starts at the start of wiping. Sometimes, the load applied to the cleaning wet sheet 1 can be reduced.
For this reason, the chemical solution is not excessively discharged to the surface to be cleaned, and there is no fear that the chemical solution is insufficient and cannot be sufficiently cleaned.

  Further, according to the present embodiment, the hydrophobic fibers are contained in the hydrophobic fiber layer 3 in a weight ratio of 50 to 100%, so that the chemical solution impregnated in the hydrophilic fiber layer 2 is adjusted and the amount of release is adjusted. Can be suitably realized.

Moreover, according to this embodiment, since the entanglement part 31 is entangled by hydroentanglement, the hydrophilic fiber layer 2 and the hydrophobic fiber layer 3 can be entangled without using an adhesive, etc. In addition, it is possible to avoid uneven wiping and the like due to the adhesive blocking the discharge surface of the chemical solution.
Moreover, according to this embodiment, since the fiber diameter of the polyethylene terephthalate fiber which comprises a hydrophobic fiber layer is 3.3 dtex or more, the rigidity (cushion property) of a fiber improves and it can operate with a light force. Further, the polyethylene terephthalate fiber having a thick fiber diameter of 3.3 dtex or more secures a gap between fibers, hardly causes a capillary phenomenon, and can prevent the chemical solution from flowing from the inner layer to the outer layer.

In addition, this invention is not limited to the said embodiment and modification, Of course, it can change suitably about a specific structure.
The cleaning wet sheet 1 may have both the front surface and the back surface as cleaning surfaces, or only one surface as a cleaning surface.
Further, although the CD direction is the wiping direction, the MD direction may be the wiping direction.

[Example 1]
In Example 1, the following was used as the cleaning wet sheet 1.
A non-woven fabric mainly composed of polyethylene terephthalate was used as the hydrophobic fiber, and a fiber mainly composed of a pulp raw material was used as the hydrophilic fiber.
As the hydrophobic fiber, a chemical fiber mainly composed of polyethylene terephthalate, polypropylene, polyethylene, or the like is used.
Specifically, the outer layer (hydrophobic fiber layer) 3 is composed of 100% hydrophobic fiber, 90% polyethylene terephthalate is contained as the hydrophobic fiber, and core and sheath fibers of polypropylene and polyethylene are used as the binder fiber. Contains 10%. In addition, polyethylene terephthalate fibers having a fineness of 3.3 dtex and binder fibers having a fineness of 1.7 dtex were used.
For chemicals, water is used as a solvent, and surfactants (anionic surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants) and water-soluble solvents (monohydric alcohols or polyhydric alcohols) are used. In this example, 1% pristol as a nonionic surfactant, 0.5% lauryl dimethylamine oxide as an amphoteric surfactant, 3.4% ethanol as an alcohol, 1-methoxy-2-propanol 1. 4% and benzalkonium chloride 0.05% were used as quaternary ammonium salts, respectively.
The inner layer (hydrophilic fiber layer) 2 is impregnated with a chemical solution so that the impregnation rate is 300%, the basis weight is 30 g / m ² , and the ratio between the inner layer 2 and the cleaning wet sheet 1 is 45%. Using.
Moreover, the stripe type thing which formed the area ratio of the entangled part 31 of the outer layer 3 to 23% was used.

[Example 2]
In Example 2, the inner layer 2 having a basis weight of 10 g / m ² and a ratio of the inner layer 2 to the cleaning wet sheet 1 of 10% was used.
Moreover, the area ratio of the entangled part 31 of the outer layer 3 was formed to 50%.
Other configurations are the same as those of the first embodiment.

[ Reference example ]
In the reference example , the inner layer 2 having a basis weight of 50 g / m ² and a ratio of the inner layer 2 to the cleaning wet sheet 1 of 60% was used.
Moreover, the area ratio of the entangled part 31 of the outer layer 3 was formed to 80%.
Other configurations are the same as those of the first embodiment.

[Comparative Example 1]
In Comparative Example 1, the inner layer 2 having a basis weight of 10 g / m ² and the ratio of the inner layer 2 to the cleaning wet sheet 1 being 9.2% was used.
Further, the area ratio of the entangled portion 31 of the outer layer 3 was 0%, that is, a plane type in which the entangled portion 31 was not formed.
Other configurations are the same as those of the first embodiment.

[Comparative Example 2]
In Comparative Example 2, the inner layer 2 had a basis weight of 0 g / m ² and the ratio of the inner layer 2 to the cleaning wet sheet 1 was 0%, that is, the inner layer 2 was not provided.
Further, the area ratio of the entangled portion 31 of the outer layer 3 was set to 50%.
Other configurations are the same as those of the first embodiment.
Comparative Example 3 is an existing cleaning wet sheet, which is a so-called conventional product.

[Comparative Example 3]
In Comparative Example 3, the inner layer 2 having a basis weight of 60 g / m ² and a ratio of the inner layer 2 to the cleaning wet sheet 1 of 65.7% was used.
Further, the area ratio of the entangled portion 31 of the outer layer 3 was set to 15%.
Other configurations are the same as those of the first embodiment.

[Comparative Example 4]
In Comparative Example 4, the inner layer 2 having a basis weight of 20 g / m ² and a ratio of the inner layer 2 to the cleaning wet sheet 1 of 28.6% was used.
Further, the area ratio of the entangled portion 31 of the outer layer 3 was set to 85%.
Other configurations are the same as those of the first embodiment.

The friction resistance value measurement and the wiping frequency test using the cleaning wet sheets 1 of Examples 1 and 2, Reference Example, and Comparative Example 1-4 were performed.
The frictional resistance value is measured according to the horizontal method of JIS-P8147: 2010. A sandpaper (# 1200, manufactured by 3M) is attached to the four sides of a 400 g weight with a bottom shape of 10 cm x 10 cm with a double-sided tape, and placed on a cleaning wet sheet 1 with four corners attached to a horizontal table with tape. Then, the resistance value when moved horizontally at a speed of 500 mm / min was measured. AUTOGRAPH AGS-500B (manufactured by Shimadzu Corporation) was used as a tensile testing machine that pulls the weight in the horizontal direction.
The static friction was measured for the initial resistance peak resistance value, and the dynamic friction was measured for an average resistance value of 40 to 60 mm after starting to slide. Further, under each condition, N = 5 was measured from two directions of the MD direction (flow direction during manufacture, the entangled stripe direction) and the CD direction (perpendicular to the MD), and the average value was taken.

The method for testing the number of times of wiping is to attach the cleaning wet sheet 1 to the jig for mounting the cleaning wet sheet 1 (quick wiper / made by Kao Co., Ltd. 2015) without sag, and the floor formed by the acrylic plate in one direction. Wipe on. The width of the jig is 25 cm and the wiping operation of 90 cm from the end to the end of the acrylic plate floor is measured once along the longitudinal direction of the acrylic plate floor (90 cm long, 130 cm wide).
1. The angle between the floor surface and the mounting jig axis is 60 degrees, and the head axis is fixed with a commercially available bond so that the angle does not fluctuate.
2. A 530 g weight (diameter: 100 mm, length: 200 mm) of a cylindrical cylinder is passed through the shaft of the head, and a sheet is mounted.
3. The measurement uses a commercially available acrylic plate with a width of 1300 mm and a depth of 900 mm on the floor, the jig axis is on the front side so that the angle between the floor surface and the mounting jig axis is 60 degrees, and the front to the back is 300 mm / s. Clean at a speed of.
4). Clean sequentially in the width direction of the acrylic board floor so that it does not overlap with the cleaned surface.
5. Before the next measurement, remove the remaining wet liquid for cleaning with a dry cloth.
Under the above-described conditions, the state where the chemical liquid is no longer released from the entire width of the cleaning wet sheet 1 is set as an end point, and the number of times of wiping until the end point is reached (the number of effective wiping times) is measured.
6). In other words, the end point is the time when the portion where the chemical solution is not clearly released to the floor surface is generated as a wiping line, and the state in which the chemical solution is not released due to the halfway is generated in the full width.
7). The number of times judged to be the end point was not included in the number of measurements.
Moreover, said test is implemented 5 times and let the average value of the frequency | count of effective wiping be a measured value.

Table 1 shows the results of the measurement of the frictional resistance value and the results of the wiping frequency test.

The results of Table 1 are described below.
When Examples 1 and 2 and the reference example and Comparative Example 1-4 are compared, the entangled portion 31 is formed in a range of 23-80%, and the basis weight of the inner layer 2 is 10-50 g / m ² , and It was confirmed that the mass ratio of 10-60% of the total amount of the wet sheet for cleaning was 100% in both the MD and CD directions (static / dynamic).

In Examples 1 and 2 and the reference example , the number of wiping operations was 45 times or more, and in Comparative Example 1-4, the number of wiping operations was 28 or less. From this, it was confirmed that the number of wiping operations increased when the (static / dynamic) friction resistance ratio was less than 100%.

  The present invention can be used for a cleaning wet sheet and a method for manufacturing the same.

1 Wet sheet for cleaning 2 Inner layer (hydrophilic fiber layer, intermediate layer)
3 Outer layer (hydrophobic fiber layer)
31 Entangled part 32 Unentangled part 311 Bottom 312 Inclined part A Entangled surface B Unentangled surface

Claims (7)

A cleaning wet sheet consisting of multiple layers and impregnated with a chemical solution,
A hydrophobic fiber layer provided on each of the front surface layer and the back surface layer;
A hydrophilic fiber layer provided in an intermediate layer sandwiched between these hydrophobic fiber layers;
An entangled part in which the hydrophobic fiber layer and the hydrophilic fiber layer are entangled;
A non-entangled part in which the hydrophobic fiber layer and the hydrophilic fiber layer are not entangled,
The hydrophilic fiber layer is impregnated with a chemical solution,
The hydrophilic fiber layer has a basis weight of 10-50 g / m ² and a mass of 10-60% of the total amount of the wet sheet for cleaning,
Was measured according to the horizontal method JIS-P8147, static friction resistance value in a direction wiping the cleaning surface of the wet sheet for the cleaning rather smaller than the dynamic friction resistance,
The static friction resistance value in the wiping direction is 500 cN or less, and the friction resistance ratio between the dynamic friction resistance value and the static friction resistance value (static friction resistance value / dynamic friction resistance value) is 0.7 or less. Wet sheet for cleaning.   2. The cleaning wet sheet according to claim 1, wherein the entangled portion is formed at an area ratio of 23 to 80% with respect to a surface area in a plan view of the front surface layer or the back surface layer.   The wet sheet for cleaning according to claim 1, wherein the entangled portion extends in a direction substantially perpendicular to a wiping direction of the wet sheet for cleaning.   The wet sheet for cleaning according to claim 3, wherein the entangled part and the non-entangled part are alternately and continuously formed along the wiping direction. The wet sheet for cleaning according to any one of claims 1 to 4 , wherein the hydrophobic fiber layer contains hydrophobic fibers at a weight ratio of 50 to 100%. The hydrophobic fibrous layer is blending ratio of polyethylene terephthalate fiber of 80% or more, the fiber diameter of the polyethylene terephthalate fibers, any one of claims 1 to 5, characterized in that at least 3.3dtex The wet sheet for cleaning as described in 2. A method for manufacturing a cleaning wet sheet for manufacturing the cleaning wet sheet according to any one of claims 1 to 6 ,
The method for producing a wet sheet for cleaning, wherein the entangled portion is formed by hydroentanglement.

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