WO2018131699A1

WO2018131699A1 - Hydroentangled nonwoven fabric

Info

Publication number: WO2018131699A1
Application number: PCT/JP2018/000759
Authority: WO
Inventors: 勇祐浦谷; 卓郎前田; 浩康坂口
Original assignee: 東洋紡株式会社
Priority date: 2017-01-16
Filing date: 2018-01-15
Publication date: 2018-07-19
Also published as: CN110191983B; JPWO2018131699A1; JP7001901B2; CN110191983A

Abstract

The present invention addresses the problem of providing a hydroentangled nonwoven fabric that offers superior softness, readily fits snugly to the contours of the face, and offers superior handling and comfort of use when used for a face mask or the like. The present invention is a hydroentangled nonwoven fabric obtained by layering a short-fiber nonwoven fabric (1), a long-fiber nonwoven fabric (2), and a short-fiber nonwoven fabric (3) in the stated order and forming an integrated laminate by hydroentanglement, wherein the hydroentangled nonwoven fabric is characterized in that: the mass per unit area of the long-fiber nonwoven fabric (2) is 7 to 15 g/m²; the tenacity at break in the machine direction is 18 N/5 cm or less; the fineness of the fibers constituting the long-fiber nonwoven fabric is 0.5 to 5 dtex; and the stress at 5% elongation of the hydroentangled nonwoven fabric in the machine direction is 2 to 14 N/5 cm.

Description

Hydroentangled nonwoven fabric

The present invention relates to a hydroentangled nonwoven fabric obtained by laminating a short fiber nonwoven fabric, a long fiber nonwoven fabric, and a short fiber nonwoven fabric in this order, and laminating and integrating them by hydroentanglement treatment, and is suitable for use as a face mask or the like.

Conventionally, hydroentangled nonwoven fabric is used for face masks impregnated with cosmetics. As a conventional hydroentangled nonwoven fabric, a hydroentangled nonwoven fabric mainly composed of cotton (cotton) is used. Cotton is used because it has water absorption and is suitable for impregnating cosmetics, is a natural fiber, has a track record of being widely used in products that come into contact with the skin, such as underwear, and This is because there is a firm feel when held by hand, and there is a sense of quality.

Patent Document 1 proposes a face mask using a hydroentangled nonwoven fabric having a two-layer structure in which a nonwoven fabric layer mainly composed of hydrophobic fibers and a nonwoven fabric mainly composed of hydrophilic fibers are joined by hydroentanglement. Further, it has been proposed that the nonwoven fabric layer mainly composed of the hydrophobic fibers is composed of a nonwoven fabric layer having a basis weight of 8 to 14 g / m ² . This face mask has a good feeling of use, excellent fit to the face, and easy handling, but has insufficient softness.

JP 2007-312967 A

The present invention has an object to provide a hydroentangled nonwoven fabric that is excellent in softness when used for a face mask or the like, is easy to adhere along the unevenness of the face, and is excellent in handling and comfort.

As a result of intensive studies, the present inventors have found that the above problems can be solved by the following means, and have reached the present invention. That is, this invention consists of the following structures.
1. In the hydroentangled nonwoven fabric in which the short fiber nonwoven fabric, the long fiber nonwoven fabric, and the short fiber nonwoven fabric are laminated in this order and laminated and integrated by the hydroentanglement process, the basis weight of the long fiber nonwoven fabric is 7 g / m ² or more and 15 g / m ² or less. The breaking strength in the direction is 18 N / 5 cm or less, the fineness of the fibers constituting the long fiber nonwoven fabric is 0.5 dtex or more and 5 dtex or less, and the stress at 5% elongation in the machine direction of the hydroentangled nonwoven fabric is 2 N / 5 cm or more and 14 N / 5 cm or less hydroentangled nonwoven fabric,
2. The hydroentangled nonwoven fabric according to 1 above, wherein the long fiber nonwoven fabric is a polyester-based long fiber nonwoven fabric.
3. The hydroentangled nonwoven fabric according to 1 or 2 above, wherein the basis weight of the short fiber nonwoven fabric is 10 g / m ² or more and 50 g / m ² or less.
4). 4. The hydroentangled nonwoven fabric according to any one of 1 to 3 above, wherein the basis weight is 27 g / m ² or more and 150 g / m ² or less.

Since the hydroentangled nonwoven fabric of the present invention is a hydroentangled nonwoven fabric excellent in softness, when used for a face mask or the like, it is easy to adhere along the unevenness of the face, and the hydroentangled fabric excellent in handling and comfort. It is a nonwoven fabric.

It is sectional drawing which shows typically one form of the hydroentangled nonwoven fabric of this invention.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a cross section of the hydroentangled nonwoven fabric of the present invention. As shown in the figure, the hydroentangled nonwoven fabric of the present invention has a three-layer structure in which a short fiber nonwoven fabric (1), a long fiber nonwoven fabric (2), and a short fiber nonwoven fabric (3) are laminated in this order by hydroentanglement treatment.

As the material used for the long-fiber nonwoven fabric, polyolefin resins such as polyethylene and polypropylene, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate can be used. Of these, a polyester resin, which is a general-purpose thermoplastic resin that is inexpensive and excellent in mechanical properties, is preferable. In the present invention, a modifier such as an antibacterial agent or a flame retardant may be added to the polyolefin-based resin or the polyester-based resin as necessary, as long as the characteristics are not deteriorated.

The basis weight of the long fiber nonwoven fabric is 7 g / m ² or more and 15 g / m ² or less, preferably 10 g / m ² or more and 13 g / m ² or less. If the basis weight is less than 7 g / m ² , the strength of the hydroentangled nonwoven fabric as a base material is insufficient, and the long fiber nonwoven fabric may be broken by the process tension during hydroentanglement, which is not preferable. Moreover, since the softness | flexibility of a hydroentangled nonwoven fabric will be impaired when it exceeds 15 g / m < ² >, it is unpreferable.

The long fiber nonwoven fabric has a breaking strength in the machine direction of 18 N / 5 cm or less, preferably 15 N / 5 cm or less, more preferably 12 N / 5 cm or less. If the breaking strength in the machine direction exceeds 18 N / 5 cm, the rigidity increases and the softness of the hydroentangled nonwoven fabric decreases, making it difficult to adhere the sheet along the unevenness of the face, resulting in poor handling and comfort. It is not preferable. The lower limit of the breaking strength in the machine direction is not particularly limited, but is preferably 2N / 5 cm or more.

The fineness of the fibers constituting the long fiber nonwoven fabric is 0.5 dtex or more and 5 dtex or less, preferably 1.0 dtex or more and 4.0 dtex or less, and more preferably 1.5 dtex or more and 3.5 dtex or less. If the fineness is less than 0.5 dtex, the fiber diameter is thin. Therefore, if a long-fiber nonwoven fabric with a basis weight in the above range is manufactured, the number of fibers increases, and as a result, thermocompression bonding is likely to occur. May be damaged. Also, the spinnability tends to deteriorate, causing various troubles such as yarn breakage, which may lead to an increase in cost due to deterioration in operability. When the fineness exceeds 5 dtex, the fiber diameter becomes thick, so when producing a non-woven fabric with a basis weight in the above range, the number of fibers is reduced, the contact between fibers is reduced, and thermocompression bonding is difficult. The sheet may break during production due to insufficient strength.

In long-fiber non-woven fabrics, in order to satisfy the breaking strength in the machine direction, the non-woven fabric thermocompression during the manufacturing process is partly formed by thermocompression bonding with a pair of heat rolls. It is preferable to do. More preferably, only one of the pair of heat rolls is engraved.
When both of the pair of heat rolls are engraving rolls, pressure bonding is too strong, and appropriate softness may not be obtained. On the contrary, when both of the pair of heat rolls are flat rolls, the sheet may be broken during production due to insufficient pressure bonding and insufficient strength.

Furthermore, in the long-fiber nonwoven fabric of the present invention, a press-bonded fiber assembly part is partially formed, and thermocompression processing is performed under conditions different from normal thermocompression processing conditions in order to satisfy the breaking strength in the machine direction. One engraved roll of the pair of thermocompression-bonding rolls is a thermocompression-bonding roll engraved with a convex pattern, and the other is a thermocompression-bonding roll having a flat surface. Furthermore, the temperature of the engraved roll surface is set to (melting point−110) ° C. or more (melting point−20) ° C. or less (polyester) of the polyester resin used as the raw material when the polyester long fiber nonwoven fabric is used as the long fiber nonwoven fabric. When the resin is polyethylene terephthalate, the temperature of the flat roll surface is set to a high temperature of 150 ° C. or higher and 240 ° C. or lower. When using a polyester long fiber nonwoven fabric as the long fiber nonwoven fabric, the polyester system used as the material The resin is preferably set to a low temperature of (melting point−110) ° C. or higher and (melting point−40) ° C. or lower (150 ° C. or higher and 220 ° C. or lower when the polyester resin is polyethylene terephthalate).
In the above temperature range, both sides may be set to the same temperature, but by setting one side to a high temperature and the other side to a low temperature, it has more softness and moderate stress at low elongation. Thus, a long-fiber nonwoven fabric in which the characteristics of the long-fiber nonwoven fabric, which has a hand-held feeling in the hydroentangled nonwoven fabric (hard to stick), is obtained.

In the long-fiber nonwoven fabric, the crimping area ratio in the dot structure of the crimped fiber assembly portion of the nonwoven fabric is preferably 8% or more and 30% or less. If it is less than 8%, the mechanical properties of the nonwoven fabric cannot be maintained, and if it exceeds 30%, the pressure bonding becomes too strong, and it becomes impossible to maintain appropriate softness. A more preferable crimping area ratio is 10% or more and 25% or less.

In the long-fiber nonwoven fabric, crimping area crimping fiber assembly portion of the dot structure of crimped fiber assembly portion of the nonwoven fabric is preferably 0.5 mm ² or more 5 mm ² or less. If it is less than 0.5 mm ² , the fixing effect of the long fibers may be reduced, and the structure retention may be reduced. On the other hand, if it exceeds 5 mm ² , the nonwoven fabric becomes hard and may not have appropriate softness. The pressure-bonding area of the pressure-bonding fiber assembly having a more preferable dot structure is 0.7 mm ² or more and 2.5 mm ² or less, and more preferably 0.9 mm ² or more and 2.0 mm ² or less.

The shape of the above-described partial crimped fiber assembly is not particularly limited, but preferably a texture pattern, a diamond pattern, a square pattern, a turtle shell pattern, an ellipse pattern, a lattice pattern, a polka dot pattern, a round pattern and the like can be exemplified. .

An example of the method for producing the long fiber nonwoven fabric of the present invention is shown below. It should be noted that the present invention is not limited by this disclosure.

A production method using polyethylene terephthalate, which is a polyester resin, as the long fiber nonwoven fabric will be described below.
The polyethylene terephthalate having an intrinsic viscosity of 0.65 is dried and then subjected to spinning by a melt spinning machine by a conventional method. The discharge amount is set according to the set pulling speed in order to obtain a desired fineness. For example, when it is desired to obtain a fiber having a fineness of 2.0 dtex, the spinning speed is set to 5000 m / min, and the single hole discharge rate is set to 0.7 g / min.
The spun yarn that has been spun is cooled by cooling air immediately below the nozzle to 10 cm, while being drawn and solidified by a traction jet installed below. The traction-spun long fibers are collected on a suction net conveyor installed below, and formed into a web so as to have a desired non-woven fabric basis weight of 7 g / m ² or more and 15 g / m ² or less. Subsequently, it is thermocompression-bonded continuously or in a separate process.

In the case of the long-fiber nonwoven fabric, the temperature of the engraving roll surface needs to consider the balance with the sheet supply speed at the time of thermocompression bonding. For example, when polyethylene terephthalate is used and the sheet supply speed is 10 m / min, preferably 150 ° C. The temperature is set to 240 ° C. or lower, more preferably 180 ° C. or higher and 220 ° C. or lower.
The surface temperature of the flat roll is preferably set to 150 ° C. or higher and 220 ° C. or lower, more preferably 180 ° C. or higher and 220 ° C. or lower, for example, when polyethylene terephthalate is used and the sheet supply speed is 10 m / min.
The linear pressure for pressure bonding by these thermocompression-bonding rolls is preferably 10 kN / m or more and 40 kN / m or less.

The fiber material constituting the short fiber nonwoven fabric preferably contains 50% by mass or more of cotton and / or rayon, more preferably contains 70% by mass or more, more preferably contains 80% by mass or more, and contains 100% by mass. Is most preferred. This is because cotton and rayon are often desired to be used as a material for a covering sheet such as a face mask. When the short fiber nonwoven fabric arranged on both sides of the long fiber nonwoven fabric is composed of cotton and / or rayon and other fibers, the other fibers include natural fibers such as silk and wool, cupra and solvent-spun cellulose fibers (lyocell). ) Or the like, and one or more selected from synthetic fibers. Specifically, solvent-spun cellulose fibers are marketed under the names Lentigryocell (registered trademark) and Tencel (registered trademark). Synthetic fibers include polyolefin fibers such as polyethylene, polypropylene, polymethylpentene, and ethylene-propylene copolymers, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, polyamide fibers such as nylon 6 and nylon 66, and acrylic fibers. Based fibers.

As cotton and rayon, those generally used for nonwoven fabric production can be arbitrarily used. Specifically, cotton or rayon having a fiber length of about 10 mm to 60 mm can be used. The short fiber nonwoven fabric disposed on both sides of the long fiber nonwoven fabric may contain a plurality of cotton and rayon having different fiber lengths and types.

The basis weight of the short fiber nonwoven fabric is appropriately selected depending on the desired basis weight of the hydroentangled nonwoven fabric. The basis weights of the short fiber nonwoven fabrics arranged on both sides of the long fiber nonwoven fabric are preferably 10 g / m ² or more and 50 g / m ² or less, respectively. The basis weights of the short fiber nonwoven fabrics arranged on both sides of the long fiber nonwoven fabric may be the same or different from each other. For example, one basis weight may be about 2 to 3 times the other basis weight.

The basis weight of the hydroentangled nonwoven fabric is preferably 27 g / m ² or more and 150 g / m ² or less, more preferably 30 g / m ² or more and 130 g / m ² or less, and further preferably 35 g / m ² or more and 120 g / m ^2. Or less, and most preferably 40 g / m ² or more and 100 g / m ² or less. If the basis weight of the hydroentangled nonwoven fabric is less than 27 g / m ² , the absolute amount of liquid that can be impregnated decreases, and the tactile sensation when held by hand does not become firm. If the basis weight exceeds 150 g / m ² , it becomes too thick and difficult to handle.

The stress at 5% elongation of the hydroentangled nonwoven fabric is 2 N / 5 cm or more and 14 N / 5 cm or less. Preferably it is 3N / 5cm or more and 13N / 5cm or less, More preferably, it is 4N / 5cm or more and 11N / 5cm or less, More preferably, it is 5N / 5cm or more and 9N / 5cm or less The stress at the time of 5% expansion | extension is 14 N / 5cm If it exceeds, the hydroentangled non-woven fabric will be hard and difficult to adhere along the unevenness of the face, resulting in poor handling and comfort. If it is less than 2N / 5 cm, the characteristic of having a hand-held feeling (hard to stick) is lost.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these. In addition, the evaluation method used by the Example and comparative example of this invention was performed by the following method.

(1) Fineness [dtex]
Five arbitrary points of the sample were selected, and the single fiber diameter was measured at n = 20 using an optical microscope, and the total average value (D) was obtained. Five fibers at the same place were taken out, and the specific gravity of the fiber was measured at n = 5 using a density gradient tube, and the total average value (p) was obtained. Subsequently, the fineness [dtex], which is the fiber weight per 10,000 m, was determined from the single fiber cross-sectional area and the average specific gravity determined from the average single fiber diameter.

(2) Weight per unit [g / m ² ]
Measured according to JIS L1913 (2010) 6.2 mass per unit area.

(3) Strength at break in the machine direction [N / 5cm]
JIS L1913 (2010) 6.3 Based on the tensile strength and elongation rate, the size of the long fiber nonwoven fabric constituting the sample is 200 mm in length in the machine direction and 50 ± 0.5 mm in width perpendicular to the machine direction The measurement sample was cut out, the grip interval was set to 100 mm, n = 8 in the machine direction of the long-fiber nonwoven fabric constituting the sample, and the tensile speed was measured at 200 mm / min to obtain the tensile stress when the sample was broken.

(4) Stress at 5% elongation in the machine direction [N / 5cm]
JIS L1913 (2010) 6.3 Based on the tensile strength and elongation rate, the size of the long fiber nonwoven fabric constituting the sample is 200 mm in length in the machine direction and 50 ± 0.5 mm in width perpendicular to the machine direction The measurement sample was cut out with a grip interval of 100 mm, and the tensile stress when the elongation was 5% was measured at n = 8 in the machine direction of the long-fiber nonwoven fabric constituting the sample at a tensile speed of 200 mm / min. Asked.

(5) Melting point [° C]
5 mg of a resin sample was taken, and the temperature at the endothermic peak position when the temperature was raised from 20 ° C. to 300 ° C. at 10 ° C./min under a nitrogen atmosphere by a differential scanning calorimeter (TA instruments Q100). The melting point was evaluated.

(5) Pressure bonding area and pressure bonding area ratio [mm ² ,%] of the pressure-bonding fiber assembly portion having a dot structure of the long-fiber nonwoven fabric
A sample is cut into 30 mm squares at 20 arbitrary locations, and a 50 × photograph is taken with an SEM. The photographed photograph is printed in A3 size, the unit area of the crimping unit is cut out, and the area (S ₀ ) is obtained. Next, only the crimping part is cut out within the crimping unit area, the crimping part area (S _p ) is obtained, and the crimping area ratio (P) is calculated. An average value of 20 points of the crimping area ratio P was obtained.
P = S _p / S ₀ (n = 20)

<Example 1>
Using a spunbond spinning facility, polyethylene terephthalate (hereinafter abbreviated as “PET”) having an intrinsic viscosity of 0.65 was melt-spun at a spinning temperature of 285 ° C. and a single-hole discharge rate of 0.7 g / min, and a spinning speed of 5000 m / min. It was taken up in minutes and collected on a net conveyor to obtain a long fiber web having a basis weight of 10 g / m ^{2 made} of long fibers having a single yarn fineness of 2.0 dtex and a birefringence (Δn) of 0.101. Using a pair of temporary thermocompression-bonding rolls composed of two flat rolls, the surface temperature was set to 160 ° C., and the press-bonding pressure was 0.19 MPa / m. Next, using a pair of thermo-compression rolls consisting of a convex oval pattern engraving roll and a flat roll with a crimp area ratio of 12%, the surface temperature of the engraving roll is 210 ° C., the surface temperature of the flat roll is 180 ° C. The web was subjected to thermocompression bonding under a linear pressure of 40 kN / m to obtain a polyethylene terephthalate long fiber nonwoven fabric.
The fineness of the fibers constituting the obtained polyethylene terephthalate long-fiber non-woven fabric is 2.0 dtex, the basis weight is 10 g / m ² , the breaking strength in the machine direction is 7.9 N / 5 cm, and the crimping area of the crimped fiber assembly part of the dot structure The pressure-bonding area ratio was 1.0 mm ² and 14%, and had softness and moderate stress at low elongation.
As the short fiber nonwoven fabric A, a short fiber nonwoven fabric comprising 100% by mass of cotton having an average fineness of 1.3 dtex and an average fiber length of 38 mm and having a basis weight of 30 g / m ² was prepared.

The short fiber nonwoven fabric A was disposed and laminated on both sides of the polyethylene terephthalate long fiber nonwoven fabric, and the laminated nonwoven fabric was subjected to hydroentanglement treatment. The water entanglement treatment was carried out by jetting a columnar water flow having a water pressure of 5 MPa three times from both sides of the nonwoven fabric and transporting it at a speed of 5 m / min. The hydroentangled nonwoven fabric was obtained by drying after hydroentanglement treatment.
The obtained hydroentangled nonwoven fabric had a basis weight of 70 g / m ² and a 5% elongation stress in the machine direction was 8.7 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 2>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 1 except that the polyethylene terephthalate long fiber nonwoven fabric had a basis weight of 13 g / m ² .
The fineness of the fibers constituting the polyethylene terephthalate long fiber nonwoven fabric is 2.0 dtex, the basis weight is 13 g / m ² , the breaking strength in the machine direction is 11.2 N / 5 cm, and the crimping area and the crimping of the crimped fiber assembly part of the dot structure The area ratio was 1.0 mm ² and 14%, and had softness and moderate stress at low elongation.
The resulting hydroentangled nonwoven fabric had a basis weight of 72 g / m ² and a 5% elongation stress in the machine direction of 10.7 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 3>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 1 except that the polyethylene terephthalate long fiber nonwoven fabric had a basis weight of 8 g / m ² .
The fineness of the fibers constituting the polyethylene terephthalate long fiber nonwoven fabric is 2.0 dtex, the basis weight is 8 g / m ² , the breaking strength in the machine direction is 5.7 N / 5 cm, and the crimping area and the crimping of the crimped fiber assembly part of the dot structure The area ratio was 1.0 mm ² and 14%, and had softness and moderate stress at low elongation.
The resulting hydroentangled nonwoven fabric had a basis weight of 69 g / m ² and a 5% elongation stress in the machine direction of 7.3 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 4>
As the short fiber nonwoven fabric B, a short fiber nonwoven fabric having an average fineness of 1.8 dtex, an average fiber length of 42 mm and 100% by weight of rayon and a basis weight of 15 g / m ² was prepared.
The said short fiber nonwoven fabric B was arrange | positioned and laminated | stacked on both sides of the polyethylene terephthalate long fiber nonwoven fabric of the same 10 g / m < ² > basis weight as what was used in Example 1, and the hydroentanglement process was performed to this laminated nonwoven fabric. The hydroentanglement treatment was carried out by jetting a columnar water stream having a water pressure of 3 MPa three times from both sides of the nonwoven fabric and transporting it at a speed of 5 m / min. The hydroentangled nonwoven fabric was obtained by drying after hydroentanglement treatment.
The obtained hydroentangled nonwoven fabric had a basis weight of 40 g / m ² and a stress at 5% elongation in the machine direction of 6.7 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 5>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 4 except that the polyethylene terephthalate long fiber nonwoven fabric had a basis weight of 13 g / m ² used in Example 2.
The obtained hydroentangled nonwoven fabric had a basis weight of 43 g / m ² and a stress at 5% elongation in the machine direction of 9.8 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 6>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 4 except that the polyethylene terephthalate long fiber nonwoven fabric had a basis weight of 8 g / m ² used in Example 3.
The resulting hydroentangled nonwoven fabric had a basis weight of 38 g / m ² and a 5% elongation stress in the machine direction of 5.2 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 7>
As the short fiber nonwoven fabric C, a short fiber nonwoven fabric composed of 100% by mass of rayon having an average fineness of 1.8 dtex and an average fiber length of 42 mm and having a basis weight of 35 g / m ² was prepared.
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 4 except that the short fiber nonwoven fabric B was changed to the short fiber nonwoven fabric C.
The resulting hydroentangled nonwoven fabric had a basis weight of 80 g / m ² and a 5% elongation stress in the machine direction of 11.8 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 8>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 4, except that the surface temperature of the engraving roll subjected to thermocompression bonding of the polyethylene terephthalate long fiber nonwoven fabric was 210 ° C. and the surface temperature of the flat roll was 210 ° C.
The fineness of the fibers constituting the polyethylene terephthalate non-woven fabric is 2.0 dtex, the basis weight is 10 g / m ² , the breaking strength in the machine direction is 14.9 N / 5 cm, and the crimping area and the crimping of the crimped fiber assembly part of the dot structure The area ratio was 1.0 mm ² and 14%, and had softness and moderate stress at low elongation.
The resulting hydroentangled nonwoven fabric had a basis weight of 40 g / m ² and a 5% elongation stress in the machine direction of 11.1 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 9>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 8 except that the short fiber nonwoven fabric B was changed to the short fiber nonwoven fabric C.
The obtained hydroentangled nonwoven fabric had a basis weight of 79 g / m ² and a 5% elongation stress in the machine direction of 14.0 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Example 10>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 5 except that the short fiber nonwoven fabric B was changed to the short fiber nonwoven fabric C.
The hydroentangled nonwoven fabric obtained had a basis weight of 82 g / m ² and a 5% elongation stress in the machine direction of 13.1 N / 5 cm. Appropriate softness, easy to adhere along the unevenness of the face, excellent handleability and ease of use, moderate stress when stretched low, hand feeling (hard to stick), good water flow A entangled nonwoven fabric was obtained.

<Comparative Example 1>
A hydroentangled nonwoven fabric was obtained in the same manner as in Example 1 except that the surface temperature of the engraving roll subjected to thermocompression bonding of the polyethylene terephthalate long fiber nonwoven fabric was 240 ° C. and the surface temperature of the flat roll was 240 ° C.
The fineness of the fibers constituting the polyethylene terephthalate long-fiber nonwoven fabric is 2.0 dtex, the basis weight is 10 g / m ² , the breaking strength in the machine direction is 23.3 N / 5 cm, and the pressure-bonding area and pressure-bonding of the pressure-bonding fiber assembly part of the dot structure The area ratio was 1.0 mm ² and 14%, and the nonwoven fabric was hard and did not have appropriate softness.
The resulting hydroentangled nonwoven fabric had a basis weight of 70 g / m ² and a 5% elongation stress in the machine direction of 15.0 N / 5 cm. A hydroentangled nonwoven fabric that is hard and difficult to adhere along the unevenness of the face and has poor handleability and ease of use was obtained.

<Comparative example 2>
A hydroentangled nonwoven fabric was obtained in the same manner as in Comparative Example 1 except that the short fiber nonwoven fabric A was changed to the short fiber nonwoven fabric B.
The resulting hydroentangled nonwoven fabric had a basis weight of 40 g / m ² and a 5% elongation stress in the machine direction of 17.1 N / 5 cm. A hydroentangled nonwoven fabric that is hard and difficult to adhere along the unevenness of the face and has poor handleability and ease of use was obtained.

<Comparative Example 3>
A hydroentangled nonwoven fabric was obtained in the same manner as in Comparative Example 1 except that the short fiber nonwoven fabric A was changed to the short fiber nonwoven fabric C.
The resulting hydroentangled nonwoven fabric had a basis weight of 80 g / m ² and a 5% elongation stress of 18.1 N / 5 cm in the machine direction. A hydroentangled nonwoven fabric that is hard and difficult to adhere along the unevenness of the face and has poor handleability and ease of use was obtained.

<Comparative example 4>
A hydroentangled nonwoven fabric was obtained in the same manner as in Comparative Example 2 except that the polyethylene terephthalate long fiber nonwoven fabric had a basis weight of 8 g / m ² .
The fineness of the fibers constituting the polyethylene terephthalate long-fiber nonwoven fabric is 2.0 dtex, the basis weight is 8 g / m ² , the breaking strength in the machine direction is 19.1 N / 5 cm, and the pressure-bonding area and pressure-bonding of the pressure-bonding fiber assembly part of the dot structure The area ratio was 1.0 mm ² and 14%, and the nonwoven fabric was hard and did not have appropriate softness.
The resulting hydroentangled nonwoven fabric had a basis weight of 38 g / m ² and a 5% elongation stress in the machine direction of 16.2 N / 5 cm. A hydroentangled nonwoven fabric that is hard and difficult to adhere along the unevenness of the face and has poor handleability and ease of use was obtained.

<Comparative Example 5>
A hydroentangled nonwoven fabric was obtained by simply laminating two short fiber nonwoven fabrics B without using the long fiber nonwoven fabric.
The resulting hydroentangled nonwoven fabric had a basis weight of 30 g / m ² and a 5% elongation stress in the machine direction of 1.4 N / 5 cm. A hydroentangled nonwoven fabric that is easy to stick, difficult to adhere along the unevenness of the face, and has poor handleability and ease of use was obtained.

<Comparative Example 6>
In the manufacturing process of the polyethylene terephthalate long fiber nonwoven fabric, the thermocompression process was not performed with the engraving roll that performs the thermocompression process. Therefore, the long fiber web was broken by the process tension due to insufficient strength, and a polyethylene terephthalate long fiber nonwoven fabric could not be obtained.

According to the present invention, since it is a hydroentangled nonwoven fabric excellent in softness, when used for a face mask or the like, it is easy to adhere along the unevenness of the face, and the hydroentangled nonwoven fabric excellent in handleability and ease of use. It is important to contribute to the industry.

1 Short fiber nonwoven fabric 2 Long fiber nonwoven fabric 3 Short fiber nonwoven fabric

Claims

In the hydroentangled nonwoven fabric in which the short fiber nonwoven fabric, the long fiber nonwoven fabric, and the short fiber nonwoven fabric are laminated in this order and laminated and integrated by the hydroentanglement process, the basis weight of the long fiber nonwoven fabric is 7 g / m 2 or more and 15 g / m 2 or less. The breaking strength in the direction is 18 N / 5 cm or less, the fineness of the fibers constituting the long fiber nonwoven fabric is 0.5 dtex or more and 5 dtex or less, and the stress at 5% elongation in the machine direction of the hydroentangled nonwoven fabric is 2 N / 5 cm or more and 14 N / 5 cm or less hydroentangled nonwoven fabric,
The hydroentangled nonwoven fabric according to claim 1, wherein the long-fiber nonwoven fabric is a polyester-based long-fiber nonwoven fabric.
The hydroentangled nonwoven fabric according to claim 1 or 2, wherein the basis weight of the short fiber nonwoven fabric is 10 g / m 2 or more and 50 g / m 2 or less.
The hydroentangled nonwoven fabric according to any one of claims 1 to 3, having a basis weight of 27 to 150 g / m 2 .