JP2017153890A - Non-woven fabric for wet wipe and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-woven fabric for wet pipes which includes a stain wiping surface and a finish wiping surface in forming wet pipes impregnated with a chemical solution, has the stain wiping surface with excellent stain removing properties of a surface to be wiped and the finish wiping surface recovering the stain and the chemical solution that remain on the surface to be wiped, and hardly damages the surface to be wiped.SOLUTION: A non-woven fabric 1 for wet pipes includes a hydrophilic non-woven fabric layer 3 including a hydrophilic fiber of 50 mass% or more, a hydrophobic non-woven fabric layer 9 including a hydrophobic fiber of 50 mass% or more, and a joining part 15 for joining the hydrophilic non-woven fabric layer 3 and the hydrophobic non-woven fabric layer 9. The hydrophobic fiber includes an ultra fine fiber, having fineness of 0.3 dtex or less, of 30 mass% or more.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a nonwoven fabric for wet wipes.

A wet wipe obtained by impregnating a liquid into a nonwoven fabric, wherein the apparent density of the surface layer on one side of the nonwoven fabric is 0.030 to 0.10 g / cm ³ in a dry state, and the surface layer on the other side of the nonwoven fabric Wet wipes are known in which the apparent density is 0.12 to 0.20 g / cm ³ in a dry state, and the fibers are raised at least on the surface with the lower apparent density (Patent Literature). 1).

JP2013-74919A

  The conventional nonwoven fabric for wet wipes disclosed in Patent Document 1 has high and low apparent density on the front and back sides of one nonwoven fabric, and has a surface excellent for dirt wiping and a surface excellent for finishing wiping. However, since the conventional nonwoven fabric for wet wipes has a single-layer structure, when it is pressed against the surface to be wiped, moisture such as a chemical solution is easily transferred within the layer, and each performance of dirt wiping and finishing wiping can be sufficiently exhibited. As described above, it was difficult to hold the surface with a high moisture content for wiping dirt and the surface with a low moisture content for finishing wiping. Moreover, the finish wipe surface of the conventional nonwoven fabric for wet wipes has a high apparent density, lacks slipperiness between the fibers constituting the finish wipe surface and the surface to be wiped, and may damage the surface to be wiped. was there.

  Therefore, the technical problem of the present invention is that when wet wipes are formed by impregnating a chemical solution, a dirt wiping surface and a finishing wiping surface are provided, and the dirt wiping surface is a stain removing property of the surface to be wiped. Another object of the present invention is to provide a non-woven fabric for wet wipes that has excellent surface finish and has a finish wiping surface that collects dirt and chemicals remaining on the surface to be wiped and that is less likely to damage the surface to be wiped.

In order to solve the above problems, the nonwoven fabric for wet wipes of the present invention is
A hydrophilic nonwoven fabric layer containing 50% by mass or more of hydrophilic fibers;
A hydrophobic nonwoven layer containing 50% by mass or more of hydrophobic fibers;
A joint for joining the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer;
With
The hydrophobic fiber contains 30% by mass or more of ultrafine fibers having a fineness of 0.3 dtex or less,
It is characterized by that.

  The nonwoven fabric for wet wipes of the present invention comprises a dirt wiping surface and a finish wiping surface when wet wipes are formed by impregnating a chemical solution, and the dirt wiping surface is a stain removing property of the surface to be wiped. In addition, the finish wiping surface collects dirt and chemicals remaining on the surface to be wiped, and hardly damages the surface to be wiped.

FIG. 1 is a plan view of a nonwoven fabric 1 for wet wipes according to the first embodiment. FIG. 2 is a schematic end face view of the nonwoven fabric 1 for wet wipes at the II-II ′ end face of FIG. 1. FIG. 3 is a schematic end view of the nonwoven fabric 1 for wet wipes at the III-III ′ end face of FIG. 1. FIG. 4 is a schematic diagram of the manufacturing apparatus 49. FIG. 5 is an enlarged schematic view of the embossing machine 72 shown in FIG.

The present invention relates to the following aspects.
[Aspect 1]
A hydrophilic nonwoven fabric layer containing 50% by mass or more of hydrophilic fibers;
A hydrophobic nonwoven layer containing 50% by mass or more of hydrophobic fibers;
A joint for joining the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer;
With
The hydrophobic fiber contains 30% by mass or more of ultrafine fibers having a fineness of 0.3 dtex or less,
A nonwoven fabric for wet wipes characterized by the above.

  According to Aspect 1, since the nonwoven fabric for wet wipes has a two-layer structure of a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer, the wet wipes obtained by impregnating the wet wipes nonwoven fabric with a chemical solution are hydrophilic. The liquid impregnation rate, which is the liquid impregnation rate of the hydrophilic nonwoven layer, is high, the liquid impregnation rate of the hydrophobic nonwoven layer is low, and the hydrophilic nonwoven layer and the hydrophobic nonwoven layer are joined at the joint. The high impregnation rate of the chemical nonwoven fabric layer and the low impregnation rate of the hydrophobic nonwoven fabric layer are easily maintained. In the above wet wipes, a hydrophilic non-woven fabric layer with a high chemical impregnation rate is used for wiping dirt, and a hydrophobic non-woven fabric layer with a low chemical solution impregnation rate is used for finishing wiping off fine dirt remaining on the surface to be wiped. be able to. That is, since the hydrophilic nonwoven fabric layer has a high chemical solution impregnation rate when wiping dirt, it is possible to wipe off the stain efficiently. The hydrophobic nonwoven fabric layer has a low chemical solution impregnation rate and a surface to be wiped. Since a predetermined amount of ultrafine fibers having good slipperiness are included, the remaining dirt can be wiped off and the remaining chemical solution can be sucked up so as not to damage the surface to be wiped when finishing wiping.

[Aspect 2]
The hydrophilic nonwoven fabric layer and the bonding portion include a first heat-fusible fiber,
The hydrophobic nonwoven fabric layer and the joint include a second heat-fusible fiber,
The nonwoven fabric for wet wipes according to aspect 1, wherein the joining portion is an embossed portion where the first heat-fusible fiber and the second heat-fusible fiber are fused.

  According to the aspect 2, the first heat-fusible fiber and the second heat-fusible fiber are fused in the embossed portion, so that the flexibility of each non-woven fabric layer is maintained and the non-woven fabric layer is maintained. Sufficient bonding strength can be provided. Moreover, since the joint part that joins the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer is an embossed part, there is a recess formed in the embossed part, and the surface area increases compared to the case without the embossed part, It is easy to wipe off fine dirt and can improve the wiping performance.

[Aspect 3]
The nonwoven fabric for wet wipes according to aspect 2, wherein in the hydrophilic nonwoven fabric layer, the first heat-fusible fiber is not fused.
According to the aspect 3, since the first heat-fusible fiber is not fused with other fibers in the hydrophilic nonwoven fabric layer, the flexibility of the hydrophilic nonwoven fabric layer can be ensured and should be wiped off. Even if the surface has a complicated shape, the performance of wiping dirt can be surely exhibited.

[Aspect 4]
The said hydrophilic nonwoven fabric layer is a nonwoven fabric for wet wipes as described in any one of aspects 1-3 which is a spunlace nonwoven fabric layer.
According to Aspect 4, since the hydrophilic nonwoven fabric layer is a spunlace nonwoven fabric layer, it has a good balance between strength and flexibility to the extent that it becomes a base material for the hydrophobic nonwoven fabric layer, and has a thickness and bulkiness. Therefore, the dirt wiped off by the dirt wiping surface is difficult to transfer to the finished wiping face, and the wiping performance of the wet wipes is improved.

[Aspect 5]
The said hydrophobic nonwoven fabric layer is a nonwoven fabric for wet wipes as described in any one of aspects 1-4 which has a ridge groove structure in the surface opposite to the surface facing the said hydrophilic nonwoven fabric layer.
According to the aspect 5, since the hydrophobic nonwoven fabric layer has the ridge groove structure, the surface area of the surface to be wiped increases as compared with the case where there is no ridge groove structure, and it is easy to wipe off fine dirt and improves the wiping performance. be able to.

[Aspect 6]
The nonwoven fabric for wet wipes according to any one of aspects 1 to 5, wherein the hydrophobic nonwoven fabric layer includes 30% by mass or more of ultrafine fibers having a fineness of less than 0.1 dtex.
According to Aspect 6, since the hydrophobic nonwoven fabric layer contains 30% by mass or more of ultra-fine fibers of less than 0.1 dtex, which is even more slippery with the surface to be wiped, when performing wet wiping of final wipes In addition, the remaining dirt can be wiped off so as not to damage the surface to be wiped. Moreover, since the hydrophobic nonwoven fabric layer has a smooth texture, even when the chemical solution impregnation rate is low, there is little irritation to the surface to be wiped, such as skin, when finishing wiping.

[Aspect 7]
The nonwoven fabric for wet wipes as described in any one of aspects 1-6 in which the said hydrophobic nonwoven fabric layer contains the said hydrophobic fiber 70 mass% or more.
According to Aspect 7, since the hydrophobic nonwoven fabric layer contains 70% by mass or more of hydrophobic fibers, it is suitable for final wiping to wipe off the chemical solution and fine dirt remaining on the surface to be wiped.

[Aspect 8]
The hydrophilic fiber has a cellulosic fiber having an average fiber length of 2.5 mm to 8.0 mm and a pulp fiber, based on the weight of the hydrophilic fiber, 30 to 90% by mass and 10 to 70% by mass, respectively. The nonwoven fabric for wet wipes as described in any one of aspects 1-7 containing%.
According to Aspect 8, when the hydrophilic nonwoven fabric layer is impregnated with a chemical solution to form a wet wipe, the wet wipe strength (wet strength) can be maintained while maintaining a high chemical solution retention rate. .

[Aspect 9]
Forming a hydrophilic nonwoven fabric layer containing 50% by mass or more of hydrophilic fibers;
Forming a hydrophobic nonwoven fabric layer containing 50% by mass or more of hydrophobic fibers, wherein the hydrophobic fiber contains 30% by mass or more of ultrafine fibers having a fineness of 0.3 dtex or less;
Forming a joint between the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer;
The manufacturing method of the nonwoven fabric for wet wipes characterized by including this.
According to the aspect 9, it is the nonwoven fabric as described in any one of aspects 1-8, Comprising: The manufacturing method of the unique nonwoven fabric for wet wipes excellent in the wiping off performance can be obtained.

[Aspect 10]
The hydrophilic nonwoven fabric layer and the bonding portion include a first heat-fusible fiber,
The hydrophobic nonwoven fabric layer and the joint include a second heat-fusible fiber,
The manufacturing method according to aspect 9, wherein in the step of forming the joint portion, the joint portion is formed by hot embossing.
According to Aspect 10, the method for producing a nonwoven fabric for wet wipes according to any one of Aspects 2 to 8 can be obtained, and the joining of both nonwoven fabric layers and the embossing are simultaneously performed by hot embossing. It can be carried out.

[Aspect 11]
In the step of forming the hydrophilic nonwoven fabric layer,
The aspect in which the hydrophilic nonwoven fabric layer is formed by forming a first web containing the hydrophilic fibers and the first heat-fusible fibers and hydroentangling the first web. 10. The production method according to 10.
According to the aspect 11, since the jet water stream is jetted onto the web and the fibers are entangled by the pressure, the balance between strength and flexibility is good, the thickness and the bulk, and the surface to be wiped It is possible to obtain a non-woven fabric suitable as wet wipes having high wiping performance, and it is possible to produce a non-woven fabric layer without using an adhesive.

[Aspect 12]
The second heat-fusible fiber has a lower melting point than the first heat-fusible fiber,
In the step of forming the hydrophobic nonwoven fabric layer,
The hydrophobic non-woven fabric layer is formed on the hydrophilic non-woven fabric layer by forming a second web containing the ultrafine fiber of 0.3 dtex or less and the second heat-fusible fiber, and then the second web. The web is subjected to steam jet processing at a temperature higher than the melting point of the second heat-fusible fiber and lower than the melting point of the first heat-fusible fiber, and the second web of the second web. The production method according to aspect 11, wherein the heat-fusible fiber is fused.

  According to the aspect 12, the steam jet processing is performed on the second web at a temperature higher than the melting point of the second heat-fusible fiber and lower than the melting point of the fiber constituting the hydrophilic nonwoven fabric layer. In particular, while the hydrophobic nonwoven fabric layer is expanded, only the hydrophobic nonwoven fabric layer is selectively exposed to heat fusion, and the hydrophilic nonwoven fabric layer is flexible without exhibiting heat fusion properties. Can be secured. Therefore, the flexibility of the hydrophilic nonwoven fabric layer can be ensured as compared with the case where the first heat-fusible fiber and the hydrophilic fiber are fused in the hydrophilic nonwoven fabric layer. In addition, the steam jet processing breaks the layers that make up the steam jet collision, particularly the fibers constituting the hydrophobic nonwoven fabric layer, and the nonwoven fabric layer obtains flexibility, thickness, and bulkiness. Dirt is difficult to transfer to the surface opposite to the surface, and as a result, the wiping performance of the wet wipes is improved.

[Aspect 13]
In the steam jet processing, steam jets are jetted from a plurality of arranged nozzles, and a row of grooves formed by the steam jet colliding with the second web, and a steam between the rows of the grooves The manufacturing method of aspect 12 which provides the structure of the ridge groove which consists of the row | line | column of the ridge part formed by being expanded by.
According to the aspect 13, by forming the ridge groove on the web including the hydrophobic fiber and the second heat-fusible fiber, the hydrophobic nonwoven fabric layer is provided with a ridge groove structure, and the hydrophobic nonwoven fabric layer Since the surface area is increased, fine dirt can be easily wiped off, and the wiping performance can be improved.

[Aspect 14]
In the step of forming the joint portion, any one of aspects 10 to 13, wherein the embossing roll abuts on the surface on which the hydrophobic nonwoven fabric layer exists, and the anvil roll abuts on the surface on which the hydrophilic nonwoven fabric layer exists. The manufacturing method as described in.
According to the fourteenth aspect, the embossing roll with unevenness has a higher thermal efficiency than the flat anvil roll by pressing the embossing roll on the surface on which the hydrophobic non-woven fabric layer on the low melting point side is present and performing heat embossing. Since it is bad, it is difficult for heat to be transmitted to portions other than the heat embossed portion of the hydrophobic nonwoven fabric layer, and it is possible to suppress the second thermally fusible fiber from being melted again and to harden the nonwoven fabric layer. The nonwoven fabric suitable as wet wipes with high wiping performance can be obtained. Further, the heat embossed portion of the hydrophobic nonwoven fabric layer makes it easy for the user to identify the difference between the dirt wiping surface and the finish wiping surface.

Hereinafter, the nonwoven fabric for wet wipes according to the present invention (hereinafter sometimes simply referred to as a nonwoven fabric) will be described in detail.
In the present specification, the “first direction”, “second direction” and “thickness direction” relating to the nonwoven fabric are respectively “predetermined direction in the plane direction of the nonwoven fabric” and “predetermined direction in the plane direction of the nonwoven fabric”. “Direction perpendicular to the direction” and “thickness direction of the nonwoven fabric” are meant.

(Embodiment)
FIG. 1 is a plan view of a nonwoven fabric 1 for wet wipes according to one of the embodiments of the present invention (first embodiment). FIG. 2 is a schematic end face view taken along the line II-II ′ of FIG. FIG. 3 is a schematic end face view of the III-III ′ end face of FIG.
As shown in FIGS. 1 and 2, the nonwoven fabric 1 includes a hydrophilic nonwoven fabric layer 3, a hydrophobic nonwoven fabric layer 9, and a bonding portion 15.

  In the first embodiment, the hydrophilic nonwoven fabric layer 3 includes a hydrophilic fiber (not shown) and a first heat-fusible fiber (not shown), and is formed from a spunlace nonwoven fabric produced according to a manufacturing method described later. Become. In the first embodiment, the hydrophobic nonwoven fabric layer 9 includes hydrophobic fibers (not shown) and second heat-fusible fibers (not shown).

In 1st Embodiment, as shown in FIG. 2 etc., the junction part 15 has joined the hydrophilic nonwoven fabric layer 3 and the hydrophobic nonwoven fabric layer 9, and originates in the hydrophilic nonwoven fabric layer 3 in the junction part 15. As shown in FIG. The first heat-fusible fibers (not shown) and the second heat-fusible fibers (not shown) derived from the hydrophobic nonwoven fabric layer 9 are heat-sealed.
The joint portion 15 includes a plurality of dot-like embossed portions 17 arranged in a staggered manner, and a linear embossed portion 19 made of a rose motif and having a linear shape having design properties.

  When the nonwoven fabric 1 is impregnated with a chemical solution to form wet wipes (not shown), the hydrophilicity of the hydrophilic nonwoven fabric layer 3 and the hydrophobicity of the hydrophobic nonwoven fabric layer 9 (low hydrophilicity). ), The impregnation rate of the chemical solution in the hydrophilic nonwoven fabric layer 3 becomes higher than the impregnation rate of the chemical solution in the hydrophobic nonwoven fabric layer 9.

  Therefore, when the surface to be wiped is wiped with the dirt wiping surface 21 which is the surface of the wet wipes including the nonwoven fabric 1 on the hydrophilic nonwoven fabric layer 3 side, a lot of chemical solution from the hydrophilic nonwoven fabric layer 3 is to be wiped off. Supplied to and can remove dirt. In the nonwoven fabric 1, the hydrophilic nonwoven fabric layer 3 and the hydrophobic nonwoven fabric layer 9 are joined together by a plurality of dot-like embossed portions 17 arranged in a staggered manner. Since the non-woven fabric layer 3 and the hydrophobic non-woven fabric layer 9 are not actively joined, the chemical solution is difficult to move from the hydrophilic non-woven fabric layer 3 to the hydrophobic non-woven fabric layer 9 when removing the dirt.

Next, when the surface to be wiped is wiped with the finish wiping surface 23 which is the surface of the hydrophobic nonwoven fabric layer 9 side of the wet wipes including the nonwoven fabric 1, the dirt that could not be removed at the time of removing the dirt becomes hydrophobic. The ultrafine fibers (not shown) contained in the nonwoven fabric layer 9 pick up and the chemical solution remaining on the surface to be wiped can be sucked up by the ultrafine fibers contained in the hydrophobic nonwoven fabric layer 9 using capillary action. . Moreover, the ultra fine fibers contained in the hydrophobic nonwoven fabric layer 9 are easy to slip on the surface to be wiped, and hardly damage the surface to be wiped.
In addition, since the hydrophobic nonwoven fabric layer 9 with a low impregnation rate of the chemical solution has a small amount of the chemical solution interposed between the surface to be wiped, the hydrophobic nonwoven fabric layer 9 is wiped when it does not contain ultrafine fibers. There is a tendency to hurt the surface to be.

  Moreover, since the nonwoven fabric 1 has the some dot-like embossed part 17 arrange | positioned in zigzag form, the fuzz of the dirt wiping surface 21 and the finishing wiping surface 23 of the nonwoven fabric 1 is suppressed. In addition, the dirt wiping surface 21 and the finish wiping surface 23 are formed with concave portions due to the dot-like embossed portions 17, and the surface areas of the dirt wiping surface 21 and the finishing wiping surface 23 are increased as compared with the case where there are no such concave portions. The wiping surface 21 can easily wipe off the dirt, and the wiping performance of the finishing wiping surface 23 can be improved.

Furthermore, since the nonwoven fabric 1 has the linear embossed part 19, a continuous recessed part (groove part) is formed in the dirt wiping surface 21 and the finish wiping surface 23, and the dirt wiping surface 21 is compared with the case where there is no said recessed part. And the surface area of the finish wiping surface 23 increases, the dirt wiping performance of the dirt wiping surface 21 is improved, and the finishing wiping performance of the finishing wiping surface 23 is improved.
In addition, when the nonwoven fabric 1 has the linear embossed part 19, the nonwoven fabric 1 has aesthetics depending on the shape of the linear embossed part.

As shown in FIG. 3, the nonwoven fabric 1 includes a plurality of ridges 5 extending in the second direction S on the dirt wiping surface 21, which is a surface on the hydrophilic nonwoven fabric layer 3 side, and between the adjacent ridges 5. A plurality of groove portions 7 extending in two directions S. By doing so, compared with the case where the dirt wiping surface 21 is not provided with the flange part 5 and the groove part 7, the surface area is increased, and the dirt is easily removed during the dirt wiping.
In addition, the some collar part 5 and the some groove part 7 may be formed by the below-mentioned hydroentanglement method etc.

Moreover, as shown in FIG. 3, the nonwoven fabric 1 is between the some ridge part 11 extended in the 2nd direction S, and the adjacent ridge part 11 in the finish wiping surface 23 which is the surface by the side of the hydrophobic nonwoven fabric layer 9. FIG. And a plurality of grooves 13 extending in the second direction S. By doing so, compared with the case where the finishing wiping surface 23 does not include the flange portion 11 and the groove portion 13, the surface area is increased, and the stains that could not be removed during the removal of the dirt when the finish wiping is performed are hydrophobic. The fine fiber (not shown) contained in the hydrophobic nonwoven fabric layer 9 picks up and the chemical solution remaining on the surface to be wiped is easily absorbed by the ultrafine fiber contained in the hydrophobic nonwoven fabric layer 9 by utilizing the capillary phenomenon. .
In addition, the some collar part 11 and the some groove part 13 can be formed by the below-mentioned high pressure steam processing method etc.

(Hydrophilic nonwoven layer)
In the nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer contains 50% by mass or more of hydrophilic fibers based on the mass of the hydrophilic nonwoven fabric layer. The said hydrophilic fiber means the fiber which has the official moisture content prescribed | regulated by JIS L 0105: 2006 "physical test method general rule of textile products" 4.1 in the range of 8.5-15.0 mass%. If the official moisture content of the hydrophilic fiber is higher than this range, the hydrophilicity becomes too high and it becomes difficult to separate the chemical solution, and there is a possibility that the chemical solution is difficult to ooze when used as wet wipes. On the other hand, if the official moisture content is lower than this range, the hydrophilicity is too low, the chemical solution holding power decreases, and the nonwoven fabric for wet wipes may not be able to maintain a chemical solution impregnation rate suitable for wiping. .
It is preferable that the said hydrophilic fiber contains the fiber which has the official moisture content of the range of 8.5-12.0 mass% from a viewpoint of the effect of this invention.

  The hydrophilic fiber is not particularly limited as long as it has the above-mentioned official moisture content. For example, cellulose fiber, pulp fiber, natural fiber such as cotton, regenerated cellulose such as rayon and cupra, semisynthetic cellulose Etc.

  In the nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer preferably contains 70% by mass or more, more preferably 80 to 95% by mass, and still more preferably 85% of the hydrophilic fiber based on the mass of the hydrophilic nonwoven fabric layer. Contains ~ 92 mass%. When the hydrophilic nonwoven fabric layer contains the hydrophilic fiber in the above range, the hydrophilic nonwoven fabric is excellent in absorbency and water retention when used as wet wipes.

The hydrophilic fiber preferably includes a fiber having a long fiber length as a skeleton of the hydrophilic nonwoven fabric layer, and the fiber having a long fiber length is preferably 2.5 mm to 8.0 mm, and more preferably 3.0 mm. Having an average fiber length of ˜7.0 mm. Examples of the fiber having a long fiber length include the cellulose-based fibers described above. In addition, the said fiber with a long fiber length does not contain a pulp fiber.
In this specification, “average fiber length” other than pulp fiber is “A7.1.1 A method (standard method)” in “A7.1 Measurement of fiber length” in Annex A of JIS L 1015: 2010. It means the average fiber length measured according to “Method of measuring the length of individual fibers on a graduated glass plate”.

  The hydrophilic fiber preferably contains a fiber having a shorter fiber length than a fiber having a longer fiber length in order to enhance the water absorption and water retention of the hydrophilic nonwoven fabric layer. The fibers having a short fiber length preferably have an average fiber length of 2.0 to 3.0 mm. As the fiber having a short fiber length, a pulp fiber is preferable.

  The average fiber length of the above-mentioned pulp fiber means a weight-weighted average fiber length, and is measured by Kajaani Fiber Lab Fiber Properties (off-line) manufactured by metso automation (kajaani Fiber Lab properties (off-line)). L (w) value.

  In the hydrophilic nonwoven fabric layer of the nonwoven fabric of the present invention, the hydrophilic fiber is preferably a fiber having a long fiber length and a fiber having a short fiber length, each based on the mass of the hydrophilic fiber. 90 mass% and 10-70 mass%, More preferably, it contains 40-85 mass% and 15-60 mass%, and More preferably, it contains 50-80 mass% and 20-50 mass%. By doing so, when the hydrophilic nonwoven fabric layer is impregnated with a chemical solution to form a wet wipe, the strength (wet strength) of the wet wipe can be maintained while maintaining a high chemical solution retention rate.

  In the hydrophilic nonwoven fabric layer of the nonwoven fabric of the present invention, the fineness of the hydrophilic fibers is preferably more than 0.1 dtex and 1.2 dtex or less, more preferably more than 0.3 dtex and 1.0 dtex or less, excluding pulp fibers. It is. When the fineness of the hydrophilic fiber is in this range, the strength of the entire nonwoven fabric for wet wipes can be ensured while having soft characteristics and texture.

In the nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer may further include a first heat-fusible fiber. The first heat-fusible fiber preferably has a melting point in the range of 130 ° C to 160 ° C, and more preferably 135 ° C to 150 ° C. This is because when the manufacturing method described later is performed, if the melting point of the first heat-fusible fiber is within this range, it is difficult to impair the flexibility of the hydrophilic nonwoven fabric layer or the entire nonwoven fabric for wet wipes.
The type of the first heat-fusible fiber is not particularly limited as long as the melting point is in the above range. For example, polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers, and polyester fibers And polyamide fibers such as nylon.

  In addition, the first heat-fusible fiber and the second heat-fusible fiber described later may be a composite fiber including a high melting point component and a low melting point component, for example, a core-sheath type composite fiber. preferable. It is from a viewpoint which suppresses that a melt | fusion part, for example, an embossed part, etc. become hard. In the case where the first heat-fusible fiber or the second heat-fusible fiber described later is a composite fiber containing a high melting point component and a low melting point component, the above-mentioned melting point is a low melting point. It means the melting point of the component.

  In the nonwoven fabric of the present invention, when the hydrophilic nonwoven fabric layer includes hydrophilic fibers and first heat-fusible fibers, the hydrophilic nonwoven fabric layer comprises hydrophilic fibers and first heat-fusible fibers. On the basis of the total mass, the hydrophilic fiber and the first heat-fusible fiber are preferably 50% by mass or more and less than 100% by mass and more than 0% by mass and 50% by mass or less, more preferably 50 to 99% by weight and 1-50% by weight, more preferably 70-99% by weight and 1-30% by weight, even more preferably 80-95% by weight and 5-20% by weight, and even more preferably 85-92% It is included in the range of 8% by mass to 15% by mass. By doing so, the joint strength of a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer and the softness | flexibility of a hydrophilic nonwoven fabric layer can be made compatible so that it may mention later.

In the nonwoven fabric of the present invention, when the hydrophilic nonwoven fabric layer includes a hydrophilic fiber and a first heat-fusible fiber, the first heat-fusible fiber is other than the first heat-fusible fiber. It is preferable that the fiber is not fused with, for example, a hydrophilic fiber. By doing so, the softness | flexibility of a hydrophilic nonwoven fabric layer can be ensured, and even if the surface which should be wiped has a complicated shape, the performance of dirt wiping can be exhibited reliably.
From this viewpoint, in the hydrophilic nonwoven fabric layer, it is preferable that the melting point of the first heat-fusible fiber is lower than the melting point of the hydrophilic fiber.

  In the nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer can contain first additional fibers other than the hydrophilic fibers and the first heat-fusible fibers within the range where the effects of the present invention are exhibited. The first additional fiber may have the above-mentioned official moisture content of less than 8.5% by weight or greater than 15.0% by weight. The first additional fiber can also have a melting point greater than 160 ° C. Examples of the first additional fiber include a hydrophobic fiber described later.

  In the nonwoven fabric of the present invention, when the hydrophilic nonwoven fabric layer includes the first additional fiber, the hydrophilic nonwoven fabric layer includes the first additional fiber, the hydrophilic fiber, and the optional first heat fusion. It is preferably contained in a range of 20% by mass or less, more preferably 10% by mass or less, and further preferably 5% by mass or less, based on the total mass of the adhesive fibers.

In 1st Embodiment, although the hydrophilic nonwoven fabric layer was the spunlace nonwoven fabric layer, in the nonwoven fabric of this invention, a hydrophilic nonwoven fabric layer can be arbitrary nonwoven fabrics, for example, an air through nonwoven fabric.
In the nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer is preferably a spunlace nonwoven fabric layer. The spunlace nonwoven fabric layer has a good balance between strength and flexibility necessary to become the base material of the hydrophobic nonwoven fabric layer described later, and has a thickness and bulkiness, so that the dirt wiped off by the dirt wiping surface is finished. There is an advantage that it is difficult to shift to the surface and the wiping performance of wet wipes is improved.

The nonwoven fabric of the present invention, the hydrophilic nonwoven fabric layer is preferably 10 to 60 g / m ^2, more preferably 20 to 50 g / m ^2, and more preferably has a basis weight of 25~40g / m ^2. By doing so, the hydrophilic nonwoven fabric layer can be sufficiently impregnated with the chemical solution, and the rigidity of the hydrophilic nonwoven fabric layer can be increased, and the wiping performance on the surface to be wiped can be prevented from being lowered.
In addition, in this specification, the basic weight of a nonwoven fabric, a hydrophilic nonwoven fabric layer, and the below-mentioned hydrophobic nonwoven fabric layer is measured as follows. Three sample pieces (10 mm × 10 mm) are cut out from the nonwoven fabric. In the measurement of the basis weight of the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer, a sample piece is prepared avoiding the joint portion if possible. One sample piece may be divided into a plurality of pieces. In the measurement of the basis weight of the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer, when the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer are all bonded with an adhesive such as hot melt, cold spraying is appropriately performed. Is used to peel off the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer.
The mass per unit area of the sample piece calculated from the average value of the mass of the sample piece for three times (for example, electronic balance HF-300 manufactured by Kensei Kogyo Co., Ltd.). g / m ² ) is the basis weight of the hydrophilic nonwoven fabric layer, the hydrophobic nonwoven fabric layer and the nonwoven fabric.

  In the present invention, as shown in the first embodiment, the hydrophilic nonwoven fabric layer preferably has a plurality of ridges and a plurality of grooves on the dirt removing surface. This is from the viewpoint of removing dirt.

(Hydrophobic nonwoven layer)
In the nonwoven fabric of this invention, a hydrophobic nonwoven fabric layer contains 50 mass% or more of hydrophobic fibers. The above-mentioned official moisture content of the hydrophobic fiber is in the range of 0.4 to 7.0% by mass. If the official moisture content of the hydrophobic fiber is higher than this range, the hydrophilicity becomes stronger and it becomes easier to retain the chemical when impregnated with the chemical, and is wiped when used as a wet wipe for finishing wiping. There is a possibility that the performance of wiping off chemicals and dirt remaining on the surface to be inferior is inferior. On the other hand, when the official moisture content is lower than this range, the water repellent effect is exhibited, there is a possibility that it becomes difficult to wipe when used as wet wipes without being familiar with the chemical solution.
From the viewpoint of the effect of the present invention, the hydrophobic fiber preferably includes a fiber having an official moisture content of 0.4 to 4.5% by mass.

  As the hydrophobic fiber, those used as hydrophobic fibers in this technical field are employed without particular limitation as long as they have the above-mentioned official moisture content. For example, nylon-6, nylon-66, etc. Polyamides such as nylon fibers, recycled fibers such as acetate, polyethylene terephthalate (PET), acrylic, polyester, Promix (registered trademark), and the like.

  In the nonwoven fabric of this invention, the said hydrophobic nonwoven fabric layer contains the said hydrophobic fiber preferably 70 mass% or more, More preferably 80 mass% or more. This is to ensure the hydrophobicity of the hydrophobic nonwoven fabric layer.

  In the nonwoven fabric of the present invention, the hydrophobic nonwoven fabric layer may include fibers other than the hydrophobic fibers (hereinafter referred to as “non-hydrophobic fibers”). Non-hydrophobic fibers have an official moisture content of less than 0.4% by weight or greater than 7.0% by weight. Examples of non-hydrophobic fibers include water-repellent fibers such as polyethylene-based synthetic fibers and the above-described hydrophilic fibers.

  In the nonwoven fabric of the present invention, when the hydrophobic nonwoven fabric layer includes non-hydrophobic fibers, the hydrophobic nonwoven fabric layer includes the hydrophobic fibers and the non-hydrophobic fibers, respectively, and the mass of the hydrophobic nonwoven fabric layer. As a reference, it is preferably 50% by mass or more and less than 100% by mass and more than 0% by mass and 50% by mass or less, more preferably 50 to 99% by mass and 1 to 50% by mass, and still more preferably 70 to 99% by mass and 1%. -30% by weight, and even more preferably in the range of 75-95% by weight and 5-25% by weight.

  In the hydrophobic nonwoven fabric layer of the nonwoven fabric of the present invention, the hydrophobic fibers preferably have a fineness of 3.0 dtex, more preferably 2.0 dtex, and even more preferably 1.5 dtex or less.

In the hydrophobic nonwoven fabric layer of the nonwoven fabric of the present invention, the hydrophobic fiber is an ultrafine fiber having a fineness of 0.3 dtex or less, based on the mass of the hydrophobic fiber, 30 mass% or more, preferably 40 mass%, more preferably Contains 50% by weight, and more preferably 60% by weight or more. By doing so, in the wet wipes containing the nonwoven fabric and the chemical solution of the present invention, the surface to be wiped remains on the surface to be wiped when the surface to be wiped is wiped with the finish wipe surface on the hydrophobic nonwoven fabric layer side. The dirt can be wiped off and the chemical remaining on the surface to be wiped can be recovered. In the wet wipes described above, the hydrophobic nonwoven fabric layer includes a predetermined amount of ultrafine fibers. Therefore, even if the impregnation rate of the chemical solution is low, the hydrophobic nonwoven fabric layer is between the fibers constituting the hydrophobic nonwoven fabric layer and the surface to be wiped. The surface to be wiped is hard to be damaged when finishing wiping. Moreover, the said nonwoven fabric can hold | maintain the soft characteristic and texture of an ultrafine fiber, and intensity | strength.
In the hydrophobic fiber, a fiber having a fineness exceeding 0.3 dtex may be referred to as a “non-fine fiber”.

In the hydrophobic nonwoven fabric layer of the nonwoven fabric of the present invention, the hydrophobic fiber may include ultrafine fibers having a fineness of 0.1 dtex or less. By doing so, the surface to be wiped is hard to be damaged when performing the finish wiping using the wet wipes. Moreover, since the hydrophobic nonwoven fabric layer has a smooth texture, even when the chemical solution impregnation rate is low, there is little irritation to the surface to be wiped, such as skin, when finishing wiping.
In addition, the said super extra fine fiber is contained in the range of the above-mentioned extra fine fiber.

  In the hydrophobic nonwoven layer of the nonwoven fabric of the present invention, the hydrophobic fibers preferably have an average fiber length in the range of 2.5 mm to 8.0 mm, and more preferably 3.0 mm to 7.0 mm. This is from the viewpoint of the strength of the nonwoven fabric, particularly the wet strength when the nonwoven fabric is impregnated with a chemical solution to form wet wipes.

  In the nonwoven fabric of the present invention, the hydrophobic nonwoven fabric layer may include heat-bonded fibers (hereinafter sometimes referred to as “second heat-bondable fibers”), and the hydrophobic nonwoven fabric layer. Is formed by heating a web containing hydrophobic fibers containing ultrafine fibers and second heat-fusible fibers, and heat-sealing the second heat-fusible fibers, that is, It is preferable that the second heat-fusible fibers are heat-sealed. By doing so, the fine fibers contained in the hydrophobic nonwoven fabric layer can easily work to prevent the surface to be wiped from being damaged when performing final wiping with wet wipes. The hydrophobic nonwoven fabric layer may include fibers that are not thermally fused (hereinafter, may be referred to as “second non-thermally fusible fibers”).

  The second heat-fusible fiber defines and identifies the fiber contained in the hydrophobic nonwoven fabric layer from the viewpoint of the melting point, and the fiber contained in the hydrophobic nonwoven fabric layer identifies the fiber contained in the hydrophobic nonwoven fabric layer from the viewpoints of hydrophobicity and hydrophilicity. It is a different concept from the “hydrophobic fiber” and any “non-hydrophobic fiber” that are defined and specified from the above. Therefore, the above-mentioned second heat-fusible fiber may be partitioned into “hydrophobic fiber” or arbitrary “non-hydrophobic fiber” from the viewpoint of hydrophobicity and hydrophilicity. The second heat-fusible fiber is generally divided into the above-described hydrophobic fibers.

  In addition, the second heat-fusible fiber includes a “non-fine fiber” and an “ultra-fine fiber” that specify and identify the fibers contained in the hydrophobic nonwoven fabric layer from the viewpoint of fineness. Is a different concept. Therefore, the second heat-fusible fiber may be divided into the above-mentioned non-ultrafine fiber, ultrafine fiber, or ultrafine fiber from the viewpoint of fineness, but from the viewpoint of the strength of the hydrophobic nonwoven fabric layer, The heat-fusible fiber 2 is preferably partitioned into non-fine fibers (having a fineness of 0.3 dtex or more) from the viewpoint of fineness.

  The second heat fusible fiber preferably has a melting point in the range of 90 ° C to 130 ° C, and more preferably 100 ° C to 120 ° C. This is because if the melting point of the hydrophobic fiber is within this range when the production method described later is carried out, it is difficult to impair the flexibility of both the hydrophobic nonwoven fabric layer and the hydrophilic nonwoven fabric layer.

  On the other hand, the second non-heat-fusible fiber has a higher melting point than the second heat-fusible fiber, preferably more than 160 ° C, more preferably 170 ° C or more, and even more preferably 180 ° C or more. Has a melting point. By doing so, the difference in melting point between the second non-heat-fusible fiber and the second heat-fusible fiber is increased, and the second heat-fusible fiber is fused during production. Thus, the adjustment not to fuse the second non-heat-fusible fiber is simplified.

  When the hydrophobic nonwoven fabric layer of the nonwoven fabric of the present invention contains the second heat-fusible fiber, the hydrophobic nonwoven fabric layer contains the second heat-fusible fiber and the second non-heat-fusible fiber. Respectively, based on the weight of the hydrophobic nonwoven fabric layer, preferably 15 to 70% by weight and 30 to 85% by weight, and more preferably 20 to 60% by weight and 40 to 80% by weight. By doing so, a hydrophobic nonwoven fabric layer is excellent in the strength, especially the wet strength when used as wet wipes.

  Examples of the second heat-fusible fiber include polyolefin fibers such as polyethylene (PE) fibers and polypropylene (PP) fibers, polyester fibers, and polyamide fibers such as nylon.

  In the nonwoven fabric of the present invention, as shown in the first embodiment, the finishing wiping surface on the hydrophobic nonwoven fabric layer side has a plurality of ridges and a plurality of grooves arranged between adjacent ridges. Is preferred. Further, the plurality of flanges and the plurality of grooves may extend in a predetermined direction. By doing so, compared with the case where the non-woven fabric does not have a plurality of ridges and a plurality of grooves on the finishing wiping surface, the surface area of the finishing wiping surface increases, and it is easy to wipe off fine dirt, improving the wiping performance. be able to.

In the nonwoven fabric of the present invention, the hydrophobic nonwoven layer preferably has a basis weight in the range of 5-50 g / m ² , more preferably 10-40 g / m ² , and even more preferably 15-30 g / m ² . By doing so, the hydrophobic nonwoven fabric layer has a certain thickness so that it can be easily wiped with finish, and the hydrophobic nonwoven fabric layer has a high rigidity and suppresses a decrease in wiping performance on the surface to be wiped. be able to.

(Joint part)
In the nonwoven fabric of this invention, a junction part will not be restrict | limited especially if a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer are joined, It can be a well-known junction part in this technical field.
The bonding portion may be an embossed portion as shown in the first embodiment, and by adhering the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer entirely or partially with an adhesive. It can also be an adhesive part formed and is preferably an embossed part. This is because the embossed portion acts to increase the surface area of the dirt removal surface and the finish wiping surface.

  In the nonwoven fabric of this invention, the said junction part may be arrange | positioned in the whole surface of a nonwoven fabric, and may be arrange | positioned at linear form, a dot form, etc.

(Nonwoven fabric for wet wipes)
Since the nonwoven fabric for wet wipes according to the present invention has a two-layer structure of a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer, the wet nonwoven fabric obtained by impregnating the wet wipes nonwoven fabric with a chemical solution is a hydrophilic nonwoven fabric. The chemical liquid impregnation rate of the layer is high, the chemical liquid impregnation rate of the hydrophobic nonwoven fabric layer is low, and the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer are joined at the joint. It is easy to maintain the height and the low chemical impregnation rate of the hydrophobic nonwoven fabric layer. In the above wet wipes, a hydrophilic non-woven fabric layer with a high chemical impregnation rate is used for wiping dirt, and a hydrophobic non-woven fabric layer with a low chemical solution impregnation rate is used for finishing wiping to wipe off fine dirt remaining on the surface to be wiped. be able to. That is, the hydrophilic nonwoven fabric layer has a high chemical solution impregnation rate (ie, a large amount of chemical solution) when wiping the stain, so that the stain can be efficiently wiped off. The hydrophobic nonwoven fabric layer has a low chemical solution impregnation rate. In addition, it contains a predetermined amount of ultrafine fibers that have good slidability with the surface to be wiped, so when finishing wiping, wipe off the remaining dirt and suck up the remaining chemical solution so as not to damage the surface to be wiped be able to.

The nonwoven fabric of the present invention preferably has a basis weight of 20 to 100 g / m ² , more preferably 30 to 80 g / m ² , and even more preferably 40 to 60 g / m ² . When the nonwoven fabric of this invention has the said basic weight, the dirt which the dirt wiping surface wiped off becomes difficult to transfer to a finishing wiping surface, and a user is easy to learn a sense of security at the time of use of wet wipes.

  The nonwoven fabric of the present invention preferably has a wet thickness of 0.35 to 0.80 mm, more preferably 0.40 to 0.70 mm. By doing so, the dirt wiped off by the dirt wiping surface becomes difficult to transfer to the finished wiping surface, and the user can easily feel a sense of security when using the wet wipes.

In the present specification, the wet thickness is measured as follows.
Thickness gauge (model FS- manufactured by Daiei Kagaku Seisakusho Co., Ltd.) provided with a non-woven fabric impregnated with ion-exchanged water in an amount of 250% by mass (impregnation rate) with respect to the mass of the non-woven fabric and having a 15 cm ² probe 60DS), and the thickness of the nonwoven fabric is measured under the measurement condition of the measurement load of ³ gf / cm ² . Three thicknesses are measured for one measurement sample, and the average value of the three thicknesses is defined as the wet thickness.
In addition, when a nonwoven fabric contains a chemical | medical solution (when it is wet wipes), natural drying or ion-exchange water is added, and an impregnation rate is adjusted to 250 mass%.

The nonwoven fabric for wet wipes of this invention impregnates a chemical | medical solution, and forms wet wipes.
Examples of the chemical liquid include those used in the art as chemical liquids for wet wipes without particular limitation, and examples thereof include an aqueous solution containing an antibacterial agent, a surfactant, a preservative, and the like. The chemical solution may be distilled water.
The impregnation ratio of the chemical solution in the wet wipes, that is, the mass ratio of the chemical solution to the nonwoven fabric for wet wipes is not particularly limited, and examples thereof include 100 to 500%.

  Although the surface which the nonwoven fabric for wet wipes of this invention should wipe is not specifically limited, It is preferable that it is a surface which is easy to be damaged. The surface to be wiped includes soft surfaces such as animal skin, such as human skin, hard surfaces, hard and glossy article surfaces, mirrors, glasses, eyeglass lenses, and the like, and preferably Examples include human skin, more preferably baby skin with weak skin.

(Method for producing nonwoven fabric for wet wipes)
The method for producing a nonwoven fabric for wet wipes of the present invention (hereinafter sometimes referred to as “nonwoven fabric production method”) will be described in detail.
FIG. 4 is a schematic diagram of a manufacturing apparatus 49 for carrying out the method for manufacturing a nonwoven fabric according to one of the embodiments of the present invention (second embodiment).

  First, a mixture of water (hydrophilic fiber, first heat-fusible fiber) constituting the hydrophilic nonwoven fabric layer and water is prepared. The mixture of fibers and water is supplied onto the support 54 of the web forming conveyor 52 by the hydrophilic nonwoven layer raw material supply head 50 and is deposited on the support 54. The support preferably has air permeability through which water vapor can pass. For example, a wire mesh or a blanket can be used for the support.

  The fiber containing water deposited on the support is disposed at a position opposite to the two high-pressure water flow nozzles 55 disposed on the support 54 and the high-pressure water flow nozzle 55 with the support interposed therebetween. The sheet W1 passes through a suction box 57 that collects the collected water. When the water flow is injected from the high-pressure water flow nozzle, the fibers containing water strengthen the strength of the sheet W1 by interlacing the fibers, and even if high-pressure steam is sprayed on the sheet W1 in a later step, a hole is opened. Less torn, torn, and blown away. Further, the wet strength of the sheet W1 can be increased without adding a paper strength enhancer to the nonwoven fabric raw material.

The amount of energy of the high-pressure water stream is preferably 0.125 to 1.324 kW / m ² . The amount of energy in the water stream: E (kW / m ² ) is calculated from the following equation.
E (kW / m ² ) = 1.63 x injection pressure (Kg / cm ² ) x injection flow rate (m ³ / min) / processing speed (m / min) / 60
here,
Injection flow rate (m ³ / min) = 750 x orifice orifice total area (m ² ) x injection pressure (Kg / cm ² ) ^ 0.495
If the energy amount of the water flow is too small, the strength of the sheet W1 may not be so strong. On the contrary, if the energy amount of the water flow is too large, the sheet W1 becomes too hard, and the volume of the sheet W1 may not be so high due to the high-pressure steam described later.

  The hole diameter of the high-pressure water nozzle is preferably 90 to 150 μm. When the hole diameter of the high-pressure water nozzle 55 is 90 μm or more, the problem that the nozzle is likely to be clogged hardly occurs. Further, when the hole diameter of the high-pressure water flow nozzle is 150 μm or less, the problem that the processing efficiency deteriorates hardly occurs.

  The hole pitch (distance between the centers of adjacent holes) of the high-pressure water nozzle is preferably 0.3 to 1.0 mm. When the hole pitch of the high-pressure water nozzle 55 is 0.3 mm or more, the pressure resistance of the nozzle is reduced and the problem of breakage is unlikely to occur. Further, when the hole pitch of the high-pressure water flow nozzle 55 is 1.0 mm or less, the problem that the fiber entanglement becomes insufficient hardly occurs.

In this way, a high-pressure water stream is jetted onto the web, and the fibers are entangled by the pressure. Therefore, the balance between strength and flexibility is good, and the thickness and bulkiness are opposite to the surface to be wiped. As a result, it is possible to obtain a non-woven fabric suitable as wet wipes having high wiping performance, and a non-woven fabric layer can be produced without using an adhesive.
In this embodiment, the hydrophilic nonwoven fabric layer is formed by the hydroentanglement method described above. However, in the present invention, the hydrophilic nonwoven fabric layer may be formed by other methods.
The high-pressure water flow nozzle 55 injects a high-pressure water flow onto the sheet W1 at substantially equal intervals in the first direction F (hereinafter also referred to as CD direction) of the sheet W1. As a result, the surface of the sheet W1 on which the high-pressure water flow is jetted extends substantially linearly in the second direction S (hereinafter also referred to as MD direction) at substantially equal intervals in the first direction F. A groove portion and a flange portion extending in the second direction adjacent to the groove portion are formed in the first direction. This groove structure corresponds to the groove portion 7 and the flange portion 5 described with reference to FIG.

  Subsequently, as shown in FIG. 4, the sheet W <b> 1 passes over the hydrophobic nonwoven fabric raw material head 59. In the hydrophobic nonwoven fabric raw material head 59, fibers constituting the hydrophobic nonwoven fabric layer (hydrophobic fibers, second heat-fusible fibers) are adjusted. The fibers constituting the hydrophobic nonwoven fabric layer move from the mesh drum onto the sheet W1 to form the web W2. A laminate in which the web W2 is laminated on the sheet W1 is referred to as an intermediate W3.

  Subsequently, as shown in FIG. 4, the intermediate W <b> 3 is transferred to the paper layer transport conveyor 61 and transferred to the first Yankee dryer 63. The Yankee dryer 63 attaches the intermediate body W3 to the drum heated to about 110 ° C. with water vapor, and dries the intermediate body W3.

  The moisture content of the intermediate W3 is preferably 10 to 45% by mass by drying with the first dryer. Here, in this specification, a moisture content is the percentage of the gram number of the water contained with respect to the total mass 100g of the web containing water. If the water content of the intermediate W3 is too small, the hydrogen bonding force between the fibers of the intermediate W3 becomes strong, and the energy required for unraveling the fibers of the intermediate W3 with water vapor described later becomes very high. On the other hand, if the water content of the intermediate W3 is too large, the energy required for drying the intermediate W3 to a predetermined water content or less by water vapor described later becomes very high.

  Subsequently, the intermediate body W <b> 3 moves onto the mesh-shaped outer peripheral surface of the cylindrical suction drum 65. At this time, more specifically, a surface where the high-pressure steam is present from the high-pressure steam nozzle 67 disposed above the outer peripheral surface of the suction drum 65 with respect to the intermediate W3 (hereinafter referred to as high-pressure steam treatment (SJ)). Sprayed so as to collide with the surface. In FIG. 4, two rows of high-pressure steam nozzles 67 are arranged, but the number of high-pressure steam nozzles may be one, or three or more. The suction drum 65 has a built-in suction device, and the steam blown from the high-pressure steam nozzle 67 is sucked by the suction device. By the steam sprayed from the high-pressure steam nozzle 67, a ridge groove structure is formed on the high-pressure steam-treated surface of the intermediate W3.

The spray pressure of the steam sprayed from the high-pressure steam nozzle is preferably 0.3 to 1.5 MPa, more preferably 0.4 to 1.2 MPa, and even more preferably 0.5 to 1.0 MPa. is there. If the water vapor spraying pressure is too small, the fiber blowing effect is weak and it becomes difficult to form the buttock. Conversely, if it is too large, the damage to the sheet becomes too large and the strength tends to decrease.
The water vapor blown from the high-pressure water vapor nozzle 67 may be a mixture of other gases such as air, but is preferably composed only of water vapor.

The high-pressure steam nozzle 67 disposed above the suction drum 65 sprays high-pressure steam on the intermediate body W3 at substantially equal intervals in the first direction F (CD direction) of the intermediate body W3. As a result, on the high-pressure steam treatment surface of the intermediate W3, in the first direction, a groove portion extending substantially linearly in the second direction S (MD direction) at substantially equal intervals in the first direction S, A flange portion extending in the second direction is formed adjacent to the groove portion. This ridge groove structure corresponds to the ridge portion 11 and the groove portion 13 described with reference to FIG.
Thus, the groove structure is imparted to the web W2 constituting the hydrophobic nonwoven fabric layer, and the surface area of the hydrophobic nonwoven fabric layer is increased, so that fine dirt can be easily wiped off and the wiping performance can be improved.

  When high-pressure steam is jetted onto the high-pressure steam-treated surface of the intermediate body W3, the fibers of the intermediate body W3 (particularly, the web W2) are unwound and the bulk of the web W2 is increased. Thereby, the intermediate body W3 that has been hardened by the pressure and water flow at the time of transfer has increased flexibility, and the tactile sensation of the intermediate body W3 is improved.

  The suction force with which the suction drum 65 sucks the intermediate body W3 by the suction device built in the suction drum 65 that sucks the steam blown from the high-pressure steam nozzle 67 is preferably −1 to −12 kPa. When the suction force of the suction drum 65 is −1 kPa or more, it is difficult to cause a problem that water vapor cannot be sucked and a blow-up occurs and is dangerous. Further, when the suction force of the suction drum 65 is −12 kPa or less, the problem that the fibers fall into the suction is less likely to occur.

  The distance between the tip of the high-pressure steam nozzle and the upper surface of the web W2 is preferably 1.0 to 10 mm. If the distance between the tip of the high-pressure steam nozzle and the upper surface of the web W2 is smaller than 1.0 mm, there may be a problem that a hole is formed in the web W2, the web W2 is torn or blown off. If the distance between the tip of the high-pressure steam nozzle and the upper surface of the web W2 is greater than 10 mm, the force for forming grooves on the surface of the web W2 in the high-pressure steam is dispersed, and the surface of the web W2 is dispersed. The efficiency of forming the groove is deteriorated.

  The hole diameter of the high pressure steam nozzle is preferably larger than the hole diameter of the high pressure water nozzle, and the hole pitch of the high pressure steam nozzle is preferably larger than the hole pitch of the high pressure water nozzle.

  The hole diameter of the high-pressure steam nozzle is preferably 150 to 600 μm. If the hole diameter of the water vapor nozzle is too small, there may be a problem that the energy is insufficient and the fibers cannot be scraped sufficiently. Further, if the hole diameter of the high-pressure steam nozzle is too large, there may be a problem that the energy is too large and the substrate damage becomes too large.

  The hole pitch (distance between the centers of adjacent holes) of the high-pressure steam nozzle is preferably 1.0 to 3.0 mm. If the hole pitch of the high-pressure steam nozzle is too small, the pressure resistance of the nozzle may be reduced, which may cause a problem of breakage. Further, if the hole pitch of the high-pressure steam nozzle is too large, there may be a problem that the fibers cannot be scraped sufficiently.

  The temperature of the high-pressure steam needs to be higher than the melting point of the second heat-fusible fiber and lower than the melting point of the first heat-fusible fiber, preferably 110 to 140 ° C., and more preferably 120 to 130 ° C. Thereby, the laminated body (intermediate body W3) of the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer-forming web is higher than the melting point of the second heat-fusible fiber and the fibers constituting the hydrophilic nonwoven fabric layer. By performing high-pressure steam processing at a temperature lower than the melting point, the thermal nonwoven fabric is selectively expressed only in the hydrophobic nonwoven fabric layer while the hydrophobic nonwoven fabric layer is expanded, and the hydrophilic nonwoven fabric layer is thermally fused. Flexibility can be ensured without exhibiting wearability. Therefore, the flexibility of the hydrophilic nonwoven fabric layer can be ensured as compared with the case where the first heat-fusible fiber and the hydrophilic fiber are fused in the hydrophilic nonwoven fabric layer. In addition, the high-pressure steam processing allows the high-pressure steam to collide, particularly the fibers constituting the hydrophobic nonwoven fabric layer, and the layer obtains flexibility, thickness, and bulkiness. As a result, it is difficult for dirt to migrate to the opposite surface, and as a result, the wiping performance of wet wipes is improved.

  The water content of the intermediate W3 after spraying high-pressure steam is preferably 45% by mass or less, and more preferably 40% by mass or less. If the moisture content of the intermediate W3 after wiping high-pressure steam is greater than 45% by mass, the moisture content of the intermediate W3 may not be reduced to 5% by mass or less by drying with a second Yankee dryer described later. is there. In this case, additional drying is required, and the production efficiency of the nonwoven fabric is deteriorated.

Subsequently, as shown in FIG. 4, the intermediate W <b> 3 is transferred to the second Yankee dryer 69. The second Yankee dryer 69 attaches the intermediate W3 to the drum heated to about 125 ° C. with water vapor, and dries the intermediate W3. The intermediate W3 after passing through the second Yankee dryer needs to be sufficiently dry. Specifically, the moisture content of the sheet W4 after passing through the second Yankee dryer is 5% by mass or less. Preferably there is.
The dried sheet W4 passes through an embossing machine 72 described later, and is wound around the winder 74 as a nonwoven fabric W5.

FIG. 5 is an enlarged schematic view of the embossing machine 72 shown in FIG.
The sheet W4 is subjected to an embossing process by an embossing machine 72 shown in FIG. The sheet W4 is set on the embossing machine 72 so that the web W2 side (high-pressure steam-treated surface) of the sheet W4 becomes the embossed surface, and the first heat-fusible property is formed by the first embossing roll 721 and the anvil roll 723 in both the upper and lower sides. A point-like embossing treatment is performed on the entire surface of the high-pressure steam-treated surface of the sheet W4 at a temperature equal to or higher than the melting point of the fiber (for example, a temperature of 135 ° C.).
In the present embodiment, the first embossing roll 721 is arranged so that the polka dot concave pattern is 5 mm apart in the circumferential direction, 5 mm apart in the width direction, 1.3 mm pattern depth, and the convex area ratio is 14.4%. Has been.
In the present invention, the arrangement of the first embossing roll is not limited to the above, but this arrangement preferably has a convex area ratio of 8% to 20%, more preferably 10% to 15%. This is because when the convex area ratio is in this range, the bonding strength between the sheets W1 and W2 by embossing is ensured and the flexibility between the sheets W1 and W2 is easily maintained.

  The first embossing roll 721 causes the sheet W4 to be too hard to be heated by performing the embossing process in a dot shape at a temperature at which the heat-fusible fiber contained in the sheet W1 (hydrophilic nonwoven layer) can be melted. In addition, the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer can be heat-sealed so as not to peel off. Moreover, fluffing at the time of use can be prevented by locally pressing a large number of fibers of the hydrophobic nonwoven fabric layer and thermally fusing them.

Subsequently, the high-pressure steam-treated surface of the sheet W4 that has been subjected to the point-like embossing treatment is further at least above the melting point of the first heat-fusible fiber (for example, 135 ° C.) by the second embossing roll 725 and the anvil roll 723. The design embossing process is partially performed on the high-pressure steam-treated surface of the sheet W4.
In this embodiment, the 2nd embossing roll 725 is arrange | positioned so that a rose floral pattern may become 135 mm space | interval in the circumferential direction, 93 mm space | interval in the width direction, and pattern depth 0.67-0.75 mm.

  The second embossing roll 725 can partially form a pattern that improves the design and wiping properties, enhances aesthetics, and can impart the effect of scraping off dirt with a large uneven pattern.

  In addition, by pressing the embossing roll against the surface where the hydrophobic nonwoven layer on the low melting point side is present and performing heat embossing, the embossing roll with unevenness is less heat efficient than the flat anvil roll. It is difficult for heat to be transmitted to parts other than the heat embossed part of the porous nonwoven fabric layer, the second heat-fusible fiber can be prevented from being melted again and the nonwoven fabric layer becomes hard, and the thickness of the nonwoven fabric layer is secured. The nonwoven fabric suitable as wet wipes with high wiping performance can be obtained. Further, the heat embossed portion of the hydrophobic nonwoven fabric layer makes it easy for the user to identify the difference between the dirt wiping surface and the finish wiping surface.

By the above manufacturing method, the nonwoven fabric for wet wipes which concerns on this invention can be produced. In addition, the said manufacturing method is an example of the manufacturing method of the nonwoven fabric for wet wipes which concerns on this invention, and the manufacturing method of the nonwoven fabric for wet wipes which concerns on this invention is not limited above. For example, the arrangement pattern of the first and second embossing rolls can be appropriately changed as long as the effects obtained by the respective embossing processes can be exhibited. Moreover, when joining a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer, even if only the embossing process by a 1st embossing roll and an anvil roll is performed, the embossing process by a 2nd embossing roll and an anvil roll is abbreviate | omitted Good.
Or when joining a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer, you may join both layers with an adhesive etc. instead of performing an embossing process.

  In addition, wet wipes are obtained by impregnating the manufactured nonwoven fabric with a liquid. The method for impregnating the liquid is not particularly limited, and examples thereof include spray impregnation and immersion impregnation.

[Example]
Example 1
Using a manufacturing apparatus as shown in FIGS. 4 and 5, a nonwoven fabric for wet wipes was produced as follows.
First, rayon with softwood bleached kraft pulp (NBKP) (Canadian Freeness Standard (cfs) 700 cc) (official moisture content 12.0 mass%) 30 mass%, fineness 0.7 dtex, and average fiber length 7 mm (Corona manufactured by Daiwabo Rayon Co., Ltd.) (official moisture content 11.0% by mass) 60% by mass and SWP (E400) having a melting point of 135 ° C. (polyethylene fiber manufactured by Mitsui Chemicals) (official moisture content 0.0 (Mass%) The hydrophilic nonwoven fabric raw material containing 10 mass% was prepared. Using a raw material supply head, a hydrophilic non-woven fabric layer raw material was supplied onto a web forming conveyor support (OS 80 manufactured by Nippon Filcon Co., Ltd.) so that the basis weight was 30 g / m ² . The sheet W1 was obtained by dehydrating with a suction box while spraying high pressure water flow using two high pressure water flow nozzles. The hole diameter of the high-pressure water nozzle is 92 μm, the hole pitch of the high-pressure water nozzle is 0.5 mm, and the energy amount of the high-pressure water stream sprayed on the web using two high-pressure water nozzles is 0.325 kW / m ² ( 0.163 kW / m ² × 2), and the traveling speed of the sheet W1 was 80 m / min.

Subsequently, PET fiber (TA04PN manufactured by Teijin Ltd.) (official moisture content 0.4 mass%) 50 mass% with fineness of 0.06 dtex and average fiber length of 6 mm, fineness of 1.1 dtex, low A hydrophobic nonwoven fabric raw material containing 50% by mass of core-sheath composite PET / low-melting point PET fiber (TJ04CN manufactured by Teijin Ltd.) (official moisture content 0.4% by mass) having a melting point of 100 ° C. was prepared. Using the raw material supply head, the hydrophobic nonwoven fabric layer raw material was supplied onto the sheet W1 so that the basis weight was 20 g / m ² , thereby obtaining an intermediate W3 in which the web W2 was laminated on the sheet W1.
Subsequently, the intermediate W3 was transferred to a paper layer conveyor, and then transferred to a Yankee dryer heated to 110 ° C. and dried.

  Next, high-pressure steam was sprayed on the surface of the intermediate W3 where the web W2 exists using two steam nozzles. The pressure of the high-pressure steam at this time is 0.4 MPa, the temperature is about 140 ° C., the distance between the tip of the steam nozzle and the upper surface of the web is 2.0 mm, and the pore diameter of the steam nozzle is 300 μm. The hole pitch was 2.0 mm, and the traveling speed of the intermediate W3 was 80 m / min. Further, a stainless steel 18 mesh perforated sleeve was used on the outer periphery of the suction drum. Then, the intermediate W3 was transferred to a Yankee dryer, dried, wound up, and a sheet W4 was obtained.

The sheet W4 was subjected to an embossing process. The sheet W4 is set in an embossing machine so that the web W2 side (high-pressure steam-treated surface) of the sheet W4 becomes an embossed-treated surface, and the high-pressure steam of the sheet W4 at a temperature of 135 ° C. by the first embossing roll and the anvil roll. A point-like embossing treatment was performed on the entire treated surface. The 1st embossing roll was arrange | positioned so that a polka-dot concave pattern might become 5 mm space | interval in the circumferential direction, 5 mm space | interval in the width direction, pattern depth 1.3mm, and a convex part area ratio might be 14.4%. Subsequently, the high-pressure steam-treated surface of the sheet W4 that has been subjected to the point-like embossing is further partially applied to the high-pressure steam-treated surface of the sheet W4 at a temperature of 135 ° C. by the second embossing roll and the anvil roll. Design embossing was performed. The 2nd embossing roll was arrange | positioned so that a rose floral pattern might become 135 mm space | interval in the circumferential direction, 93 mm space | interval in the width direction, and pattern depth 0.67-0.75 mm.
The nonwoven fabric sample A was produced by the above method.

(Example 2)
A nonwoven fabric sample B was prepared by the same method as in Example 1 except that the diameter of the water vapor nozzle when performing high-pressure steam treatment was 200 μm, the hole pitch was 1.0 mm, and the number of water vapor nozzles was changed to 5. did.

(Example 3)
The fiber composition of the raw material of the hydrophobic nonwoven fabric layer is 80% by mass of PET fiber (TA04PN manufactured by Teijin Ltd.) having a fineness of 0.06 dtex and an average fiber length of 6%, a fineness of 1.1 dtex, and a low melting point portion. Is a non-woven fabric sample C in the same manner as in Example 1 except that the composition is changed to include 20% by mass of core / sheath composite PET / low melting point PET fiber (TJ04CN manufactured by Teijin Limited) having a melting point of 100 ° C. Was made.

Example 4
The fiber composition of the raw material of the hydrophobic nonwoven fabric layer is a PET / nylon split fiber having a fineness of 0.3 dtex and an average fiber length of 6 mm (fineness of 3.3 dtex and average fiber length of 6 mm) Kuraray Wramp W-101 divided into 11 parts) 50% by mass, fineness of 1.1 dtex, low-melting point core-sheath composite PET / low-melting point PET fiber (TJ04CN manufactured by Teijin Limited) 50 mass %, A non-woven fabric sample D was produced by the method under the same conditions as in Example 1 except that the content was changed to include%.

(Example 5)
The fiber structure of the raw material of the hydrophobic nonwoven fabric layer is 30% by mass of PET fiber (TA04PN manufactured by Teijin Ltd.) having a fineness of 0.06 dtex and an average fiber length of 6 mm, and a fineness of 0.6 dtex. 20% by mass of PET fiber (TA04N manufactured by Teijin Ltd.) having a fiber length of 10 mm, a core-sheath composite PET / low-melting PET fiber (manufactured by Teijin Ltd.) having a fineness of 1.1 dtex and a low melting point of 100 ° C. TJ04CN) A nonwoven fabric sample E was produced by the same method as in Example 1 except that the content was changed to include 50% by mass.

(Example 6)
The fiber composition of the raw material of the hydrophobic nonwoven fabric layer is 20% by mass of rayon fibers (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 0.3 dtex and an average fiber length of 4 mm, and a fineness of 0.06 dtex. 30% by mass of PET fiber (TA04PN manufactured by Teijin Limited) with an average fiber length of 6 mm, core-sheath composite PET / low melting point PET fiber (Teijin Limited) having a fineness of 1.1 dtex and a low melting point of 100 ° C. Non-woven fabric sample F was prepared by the same method as in Example 1 except that the content was changed to include 50% by mass of TJ04CN).

(Comparative Example 1)
The nonwoven fabric sample G which provided high and low the apparent density of the front and back of one nonwoven fabric was produced by the method according to Example 1 described in Unexamined-Japanese-Patent No. 2013-74919. However, 70% by mass of rayon (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 0.7 dtex and an average fiber length of 7 mm, and SWP (E400) having a melting point of 135 ° C. (Mitsui Chemicals Co., Ltd. polyethylene fiber) 30% by mass was used as a raw material. In addition, the energy amount of the high-pressure water flow was changed to 0.284 kW / m ² (0.142 kW / m ² × 2), the pressure of the high-pressure steam during high-pressure steam treatment was changed to 0.7 MPa, and the pore diameter of the steam nozzle was changed to 500 μm. The embossing process was not performed.

(Comparative Example 2)
The fiber structure of the raw material of the hydrophobic nonwoven fabric layer is 50% by mass of PET fiber (TA04N manufactured by Teijin Ltd.) having a fineness of 0.6 dtex and an average fiber length of 10 mm, a fineness of 1.1 dtex, and a low melting point portion. A non-woven fabric sample H was prepared by the same method as in Example 1 except that the composition was changed to include 50% by mass of core / sheath composite PET / low melting point PET fiber (TJ04CN manufactured by Teijin Limited) having a melting point of 100 ° C. Was made.

(Comparative Example 3)
The fiber composition of the raw material of the hydrophobic nonwoven fabric layer is 50% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 0.3 dtex and an average fiber length of 4 mm, a fineness of 1.1 dtex, and a low melting point. A non-woven fabric sample in the same manner as in Example 1 except that the portion was changed to include 50% by mass of core / sheath composite PET / low melting point PET fiber (TJ04CN manufactured by Teijin Limited) having a melting point of 100 ° C. I was produced.

Nonwoven fabric basis weight, wet thickness, wiping property, and friction fastness were measured for the nonwoven fabric samples A to I obtained in the above Examples and Comparative Examples. Table 1 shows the measurement results of the configuration and characteristics of each nonwoven fabric.
Furthermore, the agar scratch test was done about the nonwoven fabric sample obtained by said Example and comparative example. The test results are shown in Table 2.

  In addition, in a present Example and a comparative example, nonwoven fabric basic weight, wet thickness, wiping off property, and friction fastness were measured as follows.

[Nonwoven fabric basis weight]
Three sample pieces (10 mm × 10 mm) are cut out from the nonwoven fabric. The mass per unit area of the sample piece calculated from the average value of the mass of the sample piece for three times (for example, electronic balance HF-300 manufactured by Kensei Kogyo Co., Ltd.). g / m ² ) is the basis weight of the nonwoven fabric.

[Wet thickness]
Thickness gauge (model FS- manufactured by Daiei Kagaku Seisakusho Co., Ltd.) provided with a non-woven fabric impregnated with ion-exchanged water in an amount of 250% by mass (impregnation rate) with respect to the mass of the non-woven fabric and having a 15 cm ² probe 60DS), and the thickness of the nonwoven fabric is measured under the measurement condition of the measurement load of ³ gf / cm ² . Three thicknesses are measured for one measurement sample, and the average value of the three thicknesses is defined as the wet thickness.

[Wipeability]
As simulated dirt, a paste having a blending ratio of 12.6% by mass of carbon black (Carbon Black, manufactured by Yoneyama Pharmaceutical Co., Ltd.), 20.8% by mass of beef tallow extremely hardened oil, and 66.6% of liquid paraffin is prepared. The paste and hexane are mixed at a ratio of 85:15 (mass ratio). 0.05 mL of hexane diluted paste is dropped on a glass plate. After drying in a high-temperature and high-humidity chamber (20 ° C., humidity 60%) for 24 hours, the color is scanned with a scanner (Epson Calorio GT-750). A wiping test (once) is performed with a friction coefficient measuring device of Tester Sangyo Co., Ltd. under conditions of 150 mm / min and a load of 60 g. After the test, the change in color is scanned with a scanner, and the change rate of the color of 16.9 mm × 16.9 mm in the scanned area is calculated by the following formula to obtain the stain removal rate.
Dirt removal rate (%) = (C0−C1) / C0 × 100

However, C0 is the color before wiping, and C1 is the color after wiping.
It can be determined that the greater the dirt removal rate, the more dirt can be removed. Measured with N number = 3, and the average value of 3 times is defined as the stain removal rate.
Each stain on the finish wiping surface (that is, the surface on which the hydrophobic nonwoven fabric layer is present and subjected to the high-pressure steam treatment) and the dirt wiping surface on the back surface (that is, the surface on which the hydrophilic nonwoven fabric layer is present) The removal rate is the geometric average of the soil removal rates in the MD direction and CD direction of the nonwoven fabric.

[Friction fastness]
A non-woven fabric sample piece (length: 200 mm, width: 300 mm) was set in a dyeing friction fastness tester (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.), and cloth tape (Nitto Denko Co., Ltd. No. 753) was placed on the friction surface of the device. And was reciprocated under a load of 200 g on the non-adhesive surface side of the fabric tape. And the frequency | count until tearing generate | occur | produces on the finishing wipe surface of a nonwoven fabric sample piece is measured in each of MD direction and CD direction of a nonwoven fabric sample piece.

[Agar scratch test]
The agar scratch test is performed as follows.
An agar obtained by placing a nonwoven fabric sample on a standard agar raw medium manufactured by AS ONE Corporation, placing a weight of 27 mm in diameter and a weight of 75 g on the sample, and pulling the nonwoven fabric sample horizontally at a pulling speed of 100 mm / min. The degree of damage to the medium is visually evaluated.
In Table 2, the evaluation criteria for “◎”, “◯”, “Δ”, and “×” are as follows.
“◎”: The depth of the scratches on the agar medium is shallow, and is a level that can be slightly confirmed visually.
“◯”: The depth of the scratch on the agar medium is relatively shallow, but it is a level that can be visually confirmed.
“Δ”: Level at which the depth of the scratches on the agar medium is slightly deep and the risk of damaging the surface to be wiped is small.
“X”: Level at which the scratches on the agar medium are deep and the surface to be wiped may be damaged.

  From Table 1, it was confirmed that the nonwoven fabrics of the examples of the present invention were significantly superior in the wiping performance of dirt as compared with the nonwoven fabric of Comparative Example 1 as a conventional example, and the friction fastness was equally excellent. .

  From Table 2, it was confirmed that the non-woven fabrics of the examples of the present invention were significantly less easily damaged than the non-woven fabrics of Comparative Examples 1 and 2.

DESCRIPTION OF SYMBOLS 1 Nonwoven fabric 3 Hydrophilic nonwoven fabric layer 5 Gutter part 7 Groove part 9 Hydrophobic nonwoven fabric layer 11 Gutter part 13 Groove part 15 Joint part 17 Point embossed part 19 Linear embossed part 21 Dirt wiping surface 23 Finish wiping surface F 1st direction S 2nd Direction T Thickness direction

Claims (14)

A hydrophilic nonwoven fabric layer containing 50% by mass or more of hydrophilic fibers;
A hydrophobic nonwoven layer containing 50% by mass or more of hydrophobic fibers;
A joint for joining the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer;
With
The hydrophobic fiber contains 30% by mass or more of ultrafine fibers having a fineness of 0.3 dtex or less,
A nonwoven fabric for wet wipes characterized by the above. The hydrophilic nonwoven fabric layer and the bonding portion include a first heat-fusible fiber,
The hydrophobic nonwoven fabric layer and the joint include a second heat-fusible fiber,
2. The nonwoven fabric for wet wipes according to claim 1, wherein the joining portion is an embossed portion in which the first heat-fusible fiber and the second heat-fusible fiber are fused.   3. The wet wipe nonwoven fabric according to claim 2, wherein in the hydrophilic nonwoven fabric layer, the first heat-fusible fiber is not fused.   The said hydrophilic nonwoven fabric layer is a nonwoven fabric for wet wipes as described in any one of Claims 1-3 which is a spunlace nonwoven fabric layer.   The said hydrophobic nonwoven fabric layer is a nonwoven fabric for wet wipes as described in any one of Claims 1-4 which has a groove structure in the surface opposite to the surface facing the said hydrophilic nonwoven fabric layer.   The nonwoven fabric for wet wipes as described in any one of Claims 1-5 in which the said hydrophobic nonwoven fabric layer contains 30 mass% or more of super extra fine fibers whose fineness is less than 0.1 dtex.   The nonwoven fabric for wet wipes as described in any one of Claims 1-6 in which the said hydrophobic nonwoven fabric layer contains the said hydrophobic fiber 70 mass% or more.   The hydrophilic fiber has a cellulosic fiber having an average fiber length of 2.5 mm to 8.0 mm and a pulp fiber, based on the weight of the hydrophilic fiber, 30 to 90% by mass and 10 to 70% by mass, respectively. The nonwoven fabric for wet wipes as described in any one of Claims 1-7 containing%. Forming a hydrophilic nonwoven fabric layer containing 50% by mass or more of hydrophilic fibers;
Forming a hydrophobic nonwoven fabric layer containing 50% by mass or more of hydrophobic fibers, wherein the hydrophobic fiber contains 30% by mass or more of ultrafine fibers having a fineness of 0.3 dtex or less;
Forming a joint between the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer;
The manufacturing method of the nonwoven fabric for wet wipes characterized by including this. The hydrophilic nonwoven fabric layer and the bonding portion include a first heat-fusible fiber,
The hydrophobic nonwoven fabric layer and the joint include a second heat-fusible fiber,
In the step of forming the joint, the joint is formed by hot embossing.
The manufacturing method according to claim 9. In the step of forming the hydrophilic nonwoven fabric layer,
The hydrophilic nonwoven fabric layer is formed by forming a first web including the hydrophilic fiber and the first heat-fusible fiber, and hydroentangling the first web. Item 11. The manufacturing method according to Item 10. The second heat-fusible fiber has a lower melting point than the first heat-fusible fiber,
In the step of forming the hydrophobic nonwoven fabric layer,
The hydrophobic non-woven fabric layer is formed on the hydrophilic non-woven fabric layer by forming a second web containing the ultrafine fiber of 0.3 dtex or less and the second heat-fusible fiber, and then the second web. The web is subjected to steam jet processing at a temperature higher than the melting point of the second heat-fusible fiber and lower than the melting point of the first heat-fusible fiber, and the second web of the second web. The manufacturing method according to claim 11, wherein the heat-fusible fiber is fused.   In the steam jet processing, steam jets are jetted from a plurality of arranged nozzles, and a row of grooves formed by the steam jet colliding with the second web, and a steam between the rows of the grooves The manufacturing method of Claim 12 which provides the structure of the ridge groove which consists of the row | line | column of the ridge part formed by being expanded.   In the step of forming the joint portion, the embossing roll abuts on the surface where the hydrophobic nonwoven fabric layer is present, and the anvil roll abuts on the surface where the hydrophilic nonwoven fabric layer is present, respectively. The production method according to item.

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