JP2002030557A - Interlaced non-woven fabric and wiping sheet and wet sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interlaced non woven fabric which has excellent functionality, strength balance and designability having a constant repeated pattern, to provide a wiping sheet which has an excellent wiping property and can uniformly wipe by reduced wiping treatments, and to provide a wet sheet which has excellent liquid permeability, scarcely gives a sticky touch, and has excellent touch and excellent holding touch with a hand. SOLUTION: This interlaced non-woven fabric which is obtained by loading a fiber web on a support having a prescribed weave structure and then applying a water flow interlacing device to the fiber web to three-dimensionally interlace and rearrange the constituting fibers, and in which pattern (A) rows (4) extended in the direction of MD and pattern (B) rows (5) obtained by inverting the pattern (A) rows and extended in the direction of MD are alternately repeated in the direction of CD. Low fiber density regions (3) exist at an angle of 5 to 60 deg. to the direction of MD on the surface of the non-woven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an entangled nonwoven fabric having a design pattern having a certain repetitive pattern and excellent strength balance and functionality of the nonwoven fabric.
Used for packaging materials, filters, kitchen paper, or other objects such as eyeglasses, OA equipment, furniture, automobiles, and other objects such as ceramic products, plastic products, and metal products, or sebum, cosmetics, and other soiled skin The present invention relates to an entangled nonwoven fabric suitable for a dry or wet wiping sheet, a wet sheet capable of imparting a functional agent such as a moisturizing component or an antiperspirant component to the skin, and the like.

[0002]

2. Description of the Related Art Conventionally, as a surface material of a sanitary material, a nonwoven fabric, a wet tissue or a disposable towel having a fiber web placed on a support for forming an opening and having an opening formed by a hydroentanglement treatment is formed. For example, a nonwoven fabric obtained by subjecting a fibrous web composed of a blend of hydrophilic fibers such as rayon or a hydrophilic fiber and a heat-adhesive conjugate fiber to a high-pressure water treatment, or various nonwoven fabrics obtained by functionally improving the nonwoven fabric Proposed. For example, Japanese Patent Application Laid-Open No. Hei 7-126975 discloses that a long-fiber nonwoven fabric and a paper sheet made of wood pulp are laminated, and a vertical weave of a wire of a support net for transport having a woven structure such as plain weave, twill weave, and cedar twill weave. By adjusting the ratio of the diameter to the diameter of the injection nozzle for applying the high-pressure water column flow to be 2.5 to 6.5, and jetting the high-pressure water column flow, the pulp fibers and the long fibers are uniformly uneven. A pulp composite sheet useful for a wiping cloth which is entangled and uniformly opened has been proposed. Japanese Patent Publication No. 1-18181 proposes that the high-pressure fluid jet nozzle is reciprocated in a direction crossing the running direction of the fiber sheet to reciprocate to suppress the surface uniformity and appearance unevenness of the nonwoven fabric.

[0003]

However, the above-mentioned nonwoven fabric has the following problems. Usually, when a fiber web is placed on a plain weave net and subjected to hydroentanglement,
A portion where the columnar flow injected from the nozzle penetrates the fiber web becomes a low fiber density region, and a high fiber density region and a low fiber density region are alternately formed in parallel with the MD direction.
Therefore, although the fibers are arranged in the MD direction and have excellent strength in the MD direction, the strength in the CD direction is inferior and the strength balance is poor, and when used as a wiping sheet,
It stretches during use in the CD direction, and dimensional stability is a problem. Furthermore, since the high fiber density region and the low fiber density region are arranged in parallel to the MD direction and have directionality, when wiping the dirt, pay attention to the directionality and do not increase the number of times of wiping. It cannot be wiped evenly. Further, Japanese Patent Application Laid-Open No. Hei 7-126975 discloses a weaving structure other than plain weaving. is there. Tokiko 1
In Japanese Patent No. 18181, since a jagged impact mark extending in the nonwoven fabric MD direction is formed, the fibers are arranged in the MD direction, and although the strength in the MD direction is excellent, the strength in the CD direction is inferior and the strength balance is poor. The problem has not been resolved. The present invention has been made in view of the above circumstances, the strength balance of the design and nonwoven fabric having a certain repetitive pattern, entangled nonwoven fabric excellent in functionality, there is a feeling of holding, even if the number of times of wiping is small evenly An object of the present invention is to provide a wiping sheet excellent in wiping property that can be wiped off, and a wet sheet excellent in liquid impregnating property, little sticky feeling, and excellent touch feeling and hand holding feeling.

[0004]

Means for Solving the Problems To solve the above-mentioned problems, a nonwoven fabric comprising a high fiber density region and a low fiber density region in which a fiber material is entangled, wherein the low fiber density region is formed on the surface of the nonwoven fabric. A pattern (A) row extending in the MD direction existing at an angle of 5 to 60 ° with respect to the machine direction (hereinafter referred to as the MD direction), and a pattern (B) extending in the MD direction obtained by inverting the pattern (A) row. ) Column and MD
By alternately and repeatedly present in a direction perpendicular to the direction (hereinafter, referred to as a CD direction), it can be seen that an entangled nonwoven fabric having a design property and a strength balance of the nonwoven fabric having a certain repeating pattern and excellent in functionality is obtained. The present invention has been reached.

One preferred embodiment of the present invention is a nonwoven fabric composed of a high fiber density region and a low fiber density region, and the high fiber density region and the low fiber density region on the nonwoven fabric surface in the MD direction of the nonwoven fabric. In the CD direction, a pattern (A) row extending in the MD direction, which alternately exists at an angle of 5 to 60 °, and a pattern (B) row extending in the MD direction, which is the pattern (A) row inverted. By alternately and repeatedly present, an entangled nonwoven fabric having a certain repetition pattern and excellent in design properties, nonwoven fabric strength balance, and functionality can be obtained. The pattern (A)
At the boundary between the row and the pattern (B) row, the high fiber density area of the pattern (A) row and the high fiber density area of the pattern (B) row preferably form a V-shaped area. At the boundary between the pattern (A) row and the pattern (B) row, the low fiber density area of the pattern (A) row and the low fiber density area of the pattern (B) row form a V-shaped area. Is preferred. By adopting such a form, in the MD direction of the nonwoven fabric, jagged continuous lines formed in the high fiber density region and jagged continuous lines formed in the low fiber density region are alternately present. CD
And a nonwoven fabric having excellent strength balance can be obtained, and thus a wiping sheet and a wet sheet excellent in handling properties and wiping ability can be obtained.

In the entangled nonwoven fabric, the row width of the pattern (A) and the row width of the pattern (B) are 10 to 10.
Preferably it is 50 mm. Further, at least one row width of the high fiber density region and the low fiber density region is
It is preferably 0.2 to 3 mm. Further, the ratio of the row width of the high fiber density area to the row width of the low fiber density area is 0.2
It is preferable that the number is 1.2. Further, it is preferable that an opening is formed in the low fiber density region in the entangled nonwoven fabric of the present invention.

Another preferred embodiment of the present invention is a nonwoven fabric comprising a high fiber density region and a low fiber density region in which a fibrous material is entangled, and the low fiber density region on the nonwoven fabric surface in the MD direction. The pattern (A) row extending in the MD direction existing at an angle of 5 to 60 ° with respect to the pattern (A) and the pattern (B) row extending in the MD direction obtained by inverting the pattern (A) row are alternately repeated in the CD direction. At the boundary between the pattern (A) row and the pattern (B) row, the low fiber density area of the pattern (A) row and the low fiber density area of the pattern (B) row are in the MD direction. The entangled nonwoven fabric having a certain repetition pattern and excellent in design properties, strength balance of the nonwoven fabric, and functionality can be obtained. The row of pattern (A) and the row of pattern (B) overlap by 70% or less of the smaller of the row width of the pattern (A) row and the row width of the pattern (B) row. Is preferred. By adopting such a form, the low fiber density regions are arranged neatly without alternately crossing in the MD direction, and a nonwoven fabric having an excellent MD / CD strength balance can be obtained. An excellent nonwoven fabric can be obtained, and a wiping sheet and a wet sheet excellent in handling properties and wiping ability can be obtained.

In the above entangled nonwoven fabric, the width of the pattern (A) and the width of the pattern (B) are 2 to 2.
Preferably it is 10 mm. The row width of the low fiber density region is preferably 0.2 to 3 mm.

[0009] The fiber material in the entangled nonwoven fabric of the present invention comprises:
It is preferable to contain 10 mass% or more of hydrophilic fibers.
Further, the fiber material preferably contains at least 20 mass% of the splittable conjugate fiber.

The wiping sheet made of the entangled non-woven fabric has such a structure, has a feeling of hand holding, and is excellent in wiping properties that can be wiped evenly even if the wiping frequency is small.

[0011] The wet sheet comprising the entangled non-woven fabric,
By adopting such a configuration, the liquid impregnating property is excellent, the sticky feeling is small, and the touch feeling and the hand holding feeling are excellent. Hereinafter, the contents of the present invention will be specifically described.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of an entangled nonwoven fabric according to the present invention.
This will be described with reference to FIG. However, the entangled nonwoven fabric of the present invention is not limited to FIGS. An entangled nonwoven fabric (1) in which a fiber material is entangled and composed of a high fiber density region (2) and a low fiber density region (3), wherein the low fiber density region (3) is a nonwoven fabric machine on the surface of the nonwoven fabric. An angle (8) of 5 to 60 ° with respect to the direction (hereinafter referred to as the MD direction)
Pattern (A) row (4) extending in the MD direction existing in
And a pattern (B) row (5) extending in the MD direction in which the pattern (A) row is inverted alternately in a direction orthogonal to the MD direction (hereinafter, referred to as a CD direction). The term “high fiber density region” as used herein means a portion (row) where the amount of accumulated fiber is large, and the term “low fiber density region” means a portion (row) where the amount of accumulated fiber is small as compared with the high fiber density region. This is defined by the relative relationship between the two regions. The MD direction is the direction in which the machines of the nonwoven fabric production line are arranged (the direction in which the nonwoven fabric travels).
Means In addition, the term “reversal” as used herein includes a case where the pattern (A) column is reversely transferred to the next, a pattern where the pattern (A) column is vertically shifted in the MD direction and a reverse transfer is performed, and a case where the boundary between adjacent columns overlaps. It is a concept.

It is important that the low fiber density region (3) exists at an angle (8) of 5 to 60 ° with respect to the MD direction of the nonwoven fabric on the surface of the nonwoven fabric of the present invention. More preferably, the angle is 10 to 45 °. If the angle is less than 5 °, it becomes nearly parallel to the MD direction, the strength balance is poor, and when used as a wiping sheet or wet sheet, the elongation in the CD direction is large, and the dimensional stability is poor. Not only is it inferior, but also because the entire nonwoven fabric has directionality, it cannot be wiped without unevenness unless the number of times of wiping is increased. Further, if the angle exceeds 60 ° but the angle is 80 ° or less, the above problem can be solved. However, the angle is not considered from the viewpoint of productivity or the strength of a support used for manufacturing a nonwoven fabric described later. To 60 ° or less.

A row (4) of patterns (A) extending in the MD direction in which the low fiber density region (3) exists at an angle (8) of 5 to 60 ° with respect to the MD direction;
It is important that the pattern (B) and the row (5) extending in the MD direction in which the rows are inverted alternately exist in the CD direction. For example, in the structure composed of only the pattern extending in the MD direction where the low fiber density region (3) exists at an angle of 5 to 60 ° with respect to the MD direction on the surface of the nonwoven fabric, that is, the structure having only the pattern (A) row, the MD direction Although it has a certain angle, it is not preferable because the whole nonwoven fabric has directionality, and the strength balance and the wiping property are inferior. Pattern sequence here (4) (5)
The term “is” means that both ends adjacent to each other in the MD direction are connected substantially parallel to the MD direction in the low fiber density region (3) arranged at an angle to the MD direction (the connected line is a boundary). (Former (6)).

In a preferred form of the entangled nonwoven fabric of the present invention, the high fiber density region (2) and the low fiber density region (3) on the surface of the nonwoven fabric are 5 to 60 with respect to the MD direction of the nonwoven fabric.
A pattern (A) row (4) extending in the MD direction, which alternately and repeatedly exists at an angle (8) of ゜, and the pattern (A)
This is a structure in which a pattern (B) extending in the MD direction in which the columns are inverted and a row (5) alternately exist in a direction orthogonal to the MD direction (hereinafter, referred to as a CD direction). When the high fiber density region (2) and the low fiber density region (3) are alternately and repeatedly present at substantially the same angle, they are arranged in a neat manner and are aesthetically pleasing, and the high fiber density region (2) and the low fiber density region The concavo-convex pattern according to (3) contributes to improvement in wiping properties when used for a wiping sheet, for example.

As shown in FIGS. 1 and 2, at the boundary (6) between the pattern (A) row (4) and the pattern (B) row (5), the height of the pattern (A) row (4) is increased. It is preferable that the fiber density region (2) and the high fiber density region (2) of the pattern (B) row (5) form a V-shaped region (7). Also at the boundary (6) between the pattern (A) row (4) and the pattern (B) row (5), the low fiber density region (3) and the pattern (B) in the pattern (A) row (4). When the low fiber density region (3) of the row (5) forms the V-shaped region (7), when used as a wiping sheet, dirt can be wiped out evenly, which is preferable. Moreover, in the CD direction, a V-shape and an inverted V-shape formed by the high fiber density area (2) and / or the low fiber density area (3) appear alternately. The property is improved and effective. Then, the V-shaped region (7) formed between the high fiber density regions and the V-shaped region (7) formed between the low fiber density regions alternately in the nonwoven fabric MD direction at the boundary (6). When it is present, it is possible to form a continuous line having a jagged shape when viewed from the direction of the nonwoven fabric MD, and to form a continuous row having a jagged shape when viewed from the direction of the nonwoven fabric CD, such that the V-shaped region apparently enters the adjacent column. As a result, the strength balance in the non-woven fabric MD / CD direction is poor or uneven wiping, such as in the form in which high fiber density regions and low fiber density regions are arranged in parallel on a plain weave net by hydroentanglement. Does not occur.

In the pattern (A) row (4) and the pattern (B) row (5), the row widths may be the same, different or different. Is preferred from the viewpoint of strength balance and wiping properties. The row width is preferably 10 to 50 mm. More preferably, it is 20 to 40 mm. Column width is 10
If it is less than mm, the high fiber density area (2) of the pattern (A) row (4) and the high fiber density area (2) of the pattern (B) row (5) and / or the pattern (A) row (4) Since the continuous rows of the V-shaped region formed by the low fiber density region (3) of the pattern (B) and the low fiber density region (3) of the column (5) of the pattern (B) become almost linear, uneven wiping may occur. Yes, column width is 5
If it exceeds 0 mm, the strength balance will be poor, and if it is used as a wiping sheet or a wet sheet, the feeling of holding will be poor.

The row width of the high fiber density area (2) and the row width of the low fiber density area (3) are preferably 0.2 to 3 mm. More preferably, it is 0.3 to 2 mm. If the row width exceeds the range of 0.2 to 3 mm, it will be biased to one area, and sufficient function will not be exhibited. For example, if it is a wiping sheet, it is collected in the high fiber density area (2). The function of keeping the stain in the low fiber density region (3) cannot be exhibited, and if the sheet is wet, the portion that contacts the object is extremely large or small, and the sheet is too wet. This is because the wettability is inferior.
Therefore, in order to sufficiently exhibit the function of the entangled nonwoven fabric of the present invention, the ratio between the row width of the high fiber density region (2) and the row width of the low fiber density region (3) is 0.2 to 1.2. It is preferred that More preferably, it is 0.4-1.

The low fiber density region (3) may have an opening (11) as shown in FIG. The opening (11) here refers to a portion where the fiber does not substantially exist in the region. Opening (11)
Is not particularly limited, and may be any of a circle, an ellipse, a rhombus, and a rectangle. The aperture pattern is
It is preferable to arrange them evenly along the direction in which the low fiber density regions (3) extend. The size of the opening (11) is preferably a hole diameter of 0.2 to 2 mm. When the pore size is less than 0.2 mm, for example, when used as a surface material of a sanitary material, the liquid permeability is poor, and when the pore size exceeds 2 mm, when used as a wiping sheet, the dirt that has been wiped off may cause hand or cleaning. This is because they adhere to tools and the like.

Another preferred embodiment of the entangled nonwoven fabric of the present invention is an MD in which the low fiber density region (3) exists at an angle (8) of 5 to 60 ° with respect to the MD direction of the nonwoven fabric on the surface of the nonwoven fabric. A pattern (A) row (4) extending in the direction and a pattern (B) row (5) extending in the MD direction, which is the reverse of the pattern (A) row, are orthogonal to the MD direction (hereinafter referred to as CD direction). At the boundary (6) between the pattern (A) row (4) and the pattern (B) row (5), the low fiber density region (3) of the pattern (A) row (4) This is a structure (9) in which the low fiber density region (3) of the pattern (B) row (5) is vertically displaced in the MD direction. When the low fiber density region (3) is shifted vertically, not only has a regular uneven pattern and is excellent in aesthetic appearance, but also the low fiber density region (3) has the same shape as the V-shaped region (7). Since they do not exist continuously but exist independently, there is no directionality and the strength balance is excellent.

As shown in FIG. 3, the boundary portions (6A) (6B) have a width of 70% or less with respect to the smaller column width of the pattern (A) row (4) and the pattern (B) row (5). )
Preferably overlap (10). A more preferred overlap ratio is 50% or less. When the overlap ratio exceeds 70%, it may be difficult to produce a support for producing an entangled nonwoven fabric described later, or the durability of the support itself may be poor, or the processability of the nonwoven fabric may be poor. Because.

In the mode (9) in which the low fiber density regions (3) are vertically displaced, the width of the pattern (A) row (4) and the pattern (B) row (5) is It is preferably from 2 to 10 mm. More preferably, it is 2 to 5 mm. When the row width is less than 2 mm, there is a limitation on the pattern of a support described later used to obtain an entangled nonwoven fabric, and when the row width exceeds 10 mm, entanglement between fibers may be insufficient.

In the mode (9) in which the low fiber density regions (3) are vertically shifted, the row width of the low fiber density regions (3) is preferably 0.2 to 5 mm.
More preferably, it is 0.4 to 2 mm. Column width is 0.2 ~
If the distance is out of the range of 5 mm, the area is biased to one area and the function is not sufficiently exhibited. For example, in the case of a wiping sheet, the dirt collected in the high fiber density area (2) is removed from the low fiber density area (2). In the case of a wet sheet, the function of holding in 3) cannot be exerted, and if the sheet is in contact with the object, the number of parts in contact with the object is extremely large or small, and the sheet is excessively wet or poor in wettability. Because.

Next, the fiber material used in the present invention will be described. The fiber material is not particularly limited as long as it has a fiber form.For example, natural fibers such as pulp, cotton, silk, wool, rayon, cupra, recycled fibers such as Tencel, polyethylene terephthalate,
Polyester fiber such as polybutylene terephthalate, polyamide fiber such as nylon 6, nylon 66, acrylic fiber, polyolefin fiber such as polyethylene, polypropylene, etc., or sheath-core type combining two or more of these resins, eccentric Sheath core type,
One type or two or more types of fibers such as a conjugate fiber having a parallel type, a split type, and a sea-island cross section can be used. The form of the fiber cross section is not particularly limited, and may be any of circular, irregular, and hollow.

As the fiber material, pulp, cotton,
An entangled nonwoven fabric containing 10% by mass or more of hydrophilic fibers such as rayon is excellent in water absorption. For example, when used as a dry wiping sheet, not only the solid component but also the liquid component of the dirt on the target surface is used. Can be wiped off, and when used as a wettable wiping sheet or a wettable sheet, the wettability is excellent and is preferable. More preferably, 3
It is 0 to 80 mass%. If within the above range, other fibers may be contained, for example, if obtaining bulkiness,
It is good to contain polyester-based fibers, and if it is to suppress stickiness and excess liquid remaining after use in a wiping sheet or wettable sheet, it is good to contain hydrophobic synthetic fibers, so that strength can be obtained. For example, it is preferable to include a heat-adhesive fiber. The content of other fibers is 70-20 mass
%. And, among the hydrophilic fibers, rayon fibers are preferably used from the viewpoint of handleability and versatility. The fineness of the hydrophilic fiber is 0.9 to 3.5
dtex is preferred. More preferably, 1.5 to 2.5 dtex
It is. If the fineness is less than 0.9 dtex, the card permeability is poor, and if it exceeds 3.5 dtex, the flexibility of the nonwoven fabric is impaired.

Also, an entangled nonwoven fabric containing 20 mass% or more of splittable conjugate fiber as the fiber material is excellent in wiping property of fine dust and dirt, and excellent in flexibility and liquid retention property, and is preferable. More preferably, the splittable conjugate fiber is 3
0 mass% or more, more preferably 30 to 80 mass%. As long as it is within the above range, other fibers may be contained. For example, if water absorption is obtained, hydrophilic fibers may be contained, and if strength is obtained, heat adhesive fibers may be contained. Good. The content of other fibers is 70-20
It is preferably mass%. The splittable conjugate fiber is split into its components at the time of the hydroentanglement treatment described later, and an ultrafine fiber having a fineness of less than 1 dtex, preferably less than 0.5 dtex is developed. As the configuration of the resin used for the splittable conjugate fiber, polyethylene terephthalate / polyethylene,
Polyethylene terephthalate / polypropylene, polyethylene terephthalate / ethylene-propylene copolymer, polypropylene / polyethylene, polyethylene terephthalate / nylon and the like are preferably used.

The form of the fibrous material of the fiber material is not particularly limited. For example, a parallel web made of staple fibers, a cross web, a semi-random web, a random web, an airlaid web made of short fibers, a wet papermaking web, a long fiber Spunbonded webs or meltblown webs or the like can be used arbitrarily. Moreover, the laminated web which laminated | stacked two or more layers of the said fiber web may be sufficient. Above all, in order to obtain entanglement and a clear constant repetition pattern due to the water flow described below, a fiber length of 25 to
It is preferred to use a fibrous web consisting of 100 mm staple fibers. When the fiber length is less than 25 mm, not only the intertwining property is inferior, but also the strength is inferior. When the fiber length exceeds 100 mm, not only the touch feeling becomes hard, but also the intertwining property is inferior. In the present invention, the fiber web may be a single layer of staple fiber or a laminated web obtained by laminating staple fibers with different configurations, or a staple fiber / wet papermaking web, a staple fiber / It is preferable to use a spunbonded web, a fiber web made of staple fibers / melt blown web, or a combination of different types of fiber webs such as a wet papermaking web, a spunbonded web, or a melt blown web sandwiched between fiber webs made of staple fibers. . As a specific configuration of the laminated web, at least one kind of fiber web selected from parallel web, cross web, semi-random web and random web composed of staple fibers is laminated on both sides of a tissue layer composed of pulp fibers. Is mentioned.

In the fibrous material, constituent fibers are entangled with each other to form a nonwoven fabric. The term "entanglement" as used herein refers to a state in which fibers are intertwined, such as intertwining with a normal fiber web or intertwining obtained by a three-dimensional intertwining process such as needle punching or hydroentangling. Among them, those three-dimensionally entangled are preferable because they have excellent feel and flexibility of the nonwoven fabric and excellent functionality when used as a wiping sheet or a wettable sheet.

The basis weight of the entangled nonwoven fabric of the present invention is preferably at least 20 g / m ² . More preferably, 30 to 100
g / m ² . When the basis weight is less than 20 g / m ² , the nonwoven fabric itself becomes too thin and inferior in strength, so that not only is the handleability poor, but also the amount of constituent fibers itself is small, so that a desired pattern is hardly formed. On the other hand, if the basis weight is too large, it is difficult to form the opening.

Next, an example of the method for producing an entangled nonwoven fabric according to the present invention will be described. First, a fiber web made of the fiber material is prepared. Then, the fiber web is placed on a support having a woven structure shown in FIGS. 4 to 6, and the constituent fibers are three-dimensionally entangled and rearranged by a water entanglement device to form a desired pattern. . FIG. 4 is a surface view of a support used to produce the entangled nonwoven fabric shown in FIG. FIG. 5 is a back view of the support of FIG. 4, which is a support used for manufacturing the entangled nonwoven fabric shown in FIG.
FIG. 6 is a surface view of a support used for manufacturing the entangled nonwoven fabric shown in FIG. As shown in FIGS. 4 and 5, the support having the woven structure has a warp (21) having a wire diameter of 0.1 to 2 mm, a warp density of 5 to 250 yarns / inch, and a weft (22) wire. Diameter 0.1-2mm, weft density 5-25
0 / inch cedar twill weave support, or spiral wire (23) having a wire diameter of 0.5-4 mm, spiral pitch (25) of 2-20 mm, and lot wire (24) having a wire diameter of 1
A spiral-woven support having a lot pitch of 26 mm and a pitch (26) of 2 to 7 mm is preferred. In particular, if the spiral wire shown in FIG. 6 is a herringbone support woven by winding three or more lot wires, the wire diameter of the spiral wire (23) is 0.7 to 2.5 mm and the spiral pitch (25) is 3 ~ 1
It is preferable that the diameter of the lot line (24) is 1 to 2.5 mm, and the lot pitch (26) is 2 to 5 mm. If the warp density, the weft density, or the spiral pitch and the lot pitch are less than the lower limit, it is difficult to obtain a clear pattern. If the upper limit is exceeded, the pattern itself becomes too large, and the nonwoven fabric itself and the entanglement of the fibers are not entangled. For example, when used as a wiping sheet, there is a possibility that the material becomes fluffy or the capturing efficiency is deteriorated.

The cross section of the yarn may be circular or non-circular. The number of warps or spiral wires may be one or a plurality. In the case of a plurality of fibers, a region having a higher fiber density than the surroundings is partially formed between the yarns or the lines in the low fiber density region, but it is sufficient that they collectively form a low fiber density region. . The weft or lot wire may be a crimped or twisted one in addition to a straight one. When the surface shown in FIG. 4 is the fiber web side in the low fiber density region, it forms a non-perforated low fiber density region, and when the surface shown in FIG. 5 is the fiber web side, it corresponds to the raised portion of the warp. A low fiber density region in which the formed opening is formed is obtained.

The conditions for the hydroentanglement treatment may be set according to the basis weight, flexibility, and functionality of the nonwoven fabric to be finally obtained, or the formability of pores if pores are to be formed. For example, if you want to entangle normal fibers,
0.5 to 1.5 orifices with a hole diameter of 0.05 to 0.5 mm
From a nozzle provided at an interval of mm, a columnar water stream having a water pressure of 1 to 10 MPa may be sprayed on one or both sides of the nonwoven fabric one to four times. At this time, as preliminary entanglement processing,
It is preferable to perform the entanglement after the water entanglement using a support having a plain weave structure, since the entanglement is improved, which is preferable. If the splittable conjugate fiber is used, the water pressure is preferably 3 to 15 MPa in consideration of the splitting property. After the water entanglement treatment, drying is performed to remove water. At this time, when the heat-adhesive fiber is used as the fibrous material, it is preferable to perform the heat treatment at a temperature at which the heat-adhesive fiber melts after or simultaneously with the drying.

The entangled nonwoven fabric thus obtained is used for sanitary materials, packaging materials, filters, kitchen paper, or products such as glasses, OA equipment, furniture, automobiles, ceramic products, plastic products, metal products, etc. Used for dry or wet wiping sheets used for human beings, such as sebum, cosmetics, and other soiled skin, and wettable sheets that can impart functional agents such as moisturizing components and antiperspirant components to the skin be able to. When the entangled nonwoven fabric of the present invention is used as a wet wiping sheet or a wettable sheet, depending on the purpose, water, wetting agents such as ethylene glycol and propylene glycol, alcohols, antibacterial agents,
A desired liquid such as a fungicide such as a fungicide or a fragrance may be applied by a known method. The liquid retention ratio may be appropriately set according to the purpose, but it is generally preferable to wet the nonwoven fabric at 100 to 300 mass%.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described with reference to embodiments. In addition, the thickness, tensile strength, and elongation of the obtained nonwoven fabric were measured by the following methods.

[Thickness] Thickness measuring device (trade name: THICKNESS)
Using a GAUGE model CR-60A (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.), the measurement was performed with a load of 20 g applied per 1 cm ^{2 of} the sample.

[Tensile strength, elongation] JIS-L-191
5cm in width and 15cm in length according to 6.3.2 (when wet)
Was gripped at a grip interval of 10 cm, stretched at a tensile speed of 30 cm / min using a constant-speed stretching type tensile tester, and the load value and elongation at cutting were defined as tensile strength and elongation, respectively.

[Example 1] As the hydrophilic fiber, fineness of 1.
Rayon fiber (manufactured by Daiwabo Rayon Co., Ltd.) having a dtex of 7 dtex and a fiber length of 40 mm was used as a hydrophobic synthetic fiber at 60 mass%.
Polyester fiber having a fineness of 1.7 dtex and a fiber length of 44 mm (manufactured by Toyobo Co., Ltd.) of 20 mass%, and a heat-adhesive fiber having a sheath component of high-density polyethylene and a core component of polypropylene having a fineness of 2.2 dtex, fiber A 51 mm long sheath-core type composite fiber (manufactured by Daiwa Spinning Co., Ltd., NBF (H)) was mixed into a fiber material. Next, the fiber material is converted into a fiber web by using a semi-random card machine.
A 132-mm, 90-mesh plain mesh net is placed on a plain weave net, and a columnar water stream with a water pressure of 3 MPa is jetted once from the nozzle provided with orifices having a hole diameter of 0.1 mm at intervals of 0.6 mm toward the surface side of the fiber web. did. Then, the fiber web is turned over, and as shown in FIG. 4, the warp wire diameter is 0.4 mm, the weft wire diameter is 0.8 mm, and the weave density is 68/18 (lines / inch).
/ 1 Place on a cedar twill weave net, water pressure 3MP on fiber web
After injecting the columnar water stream of a three times, entanglement and rearrangement of the constituent fibers, the moisture contained in the nonwoven fabric is once naturally dried, and subjected to a heat treatment at 140 ° C. using a hot air penetration dryer, The sheath component of the heat-adhesive fiber was heat-bonded to obtain an entangled nonwoven fabric having a basis weight of about 40 g / m ² . The obtained entangled nonwoven fabric is
It had a V-shaped region at the boundary. The overlap rate was 0%.

Example 2 A cedar twill woven net as shown in FIG. 4 was used in place of the cedar twill woven net of Example 1 with a basis weight of about 40 g / m ² in the MD direction. An entangled nonwoven fabric having an oval opening of about 1 mm and about 0.3 mm in the CD direction was obtained. The obtained entangled nonwoven fabric is
It had a V-shaped region at the boundary. The overlap rate was 0%.

Example 3 The warp wire diameter was 0.6 mm, the weft wire diameter was 0.9 mm, and the weaving density was 3/16 of 40/16 (lines / inch).
An entangled nonwoven fabric having a basis weight of about 40 g / m ² was obtained in the same manner as in Example 1 except that one cedar twill weave net was used. The obtained entangled nonwoven fabric had a V-shaped region at the boundary. The overlap rate was 0%.

[Embodiment 4] A spiral wire having a diameter of 1.5 mm, a spiral pitch of 7 mm, a lot wire having a diameter of 1.5 mm and a lot pitch of 3 mm as shown in FIG. A basis weight of about 40 was obtained in the same manner as in Example 1 except that a herring bonnet in which four wires were wound was used.
g / m ² entangled nonwoven fabric was obtained. In the obtained entangled nonwoven fabric, the low fiber density region was present in the boundary portion vertically shifted. The overlap ratio was about 40%.

Comparative Example 1 Using the fiber material of Example 1,
A fiber web is formed using a semi-random card machine, and the fiber web is formed to have a warp wire diameter of 0.132 mm and a weft yarn diameter of 0.132.
mm, the number of mesh is placed on a 90-mesh plain woven net, and a water pressure of 3 MPa is applied to the surface side of the fiber web from a nozzle provided with orifices having a hole diameter of 0.1 mm at intervals of 0.6 mm.
2 times, and a 3MPa columnar water flow on the back side
After spraying twice to entangle the constituent fibers, the moisture contained in the non-woven fabric is naturally dried once, and then dried using a hot air penetration dryer.
Heat treatment was performed at 40 ° C., and the sheath component of the heat-adhesive fiber was heat-bonded to obtain an entangled nonwoven fabric having a basis weight of about 40 g / m ² .

Comparative Example 2 Using the fiber material of Example 1,
A fiber web is formed using a semi-random card machine, and the fiber web is formed to have a warp wire diameter of 0.132 mm and a weft yarn diameter of 0.132.
mm, the number of mesh is placed on a 90-mesh plain woven net, and a water pressure of 3 MPa is applied to the surface side of the fiber web from a nozzle provided with orifices having a hole diameter of 0.1 mm at intervals of 0.6 mm.
Was jetted twice. Then, the fiber web is turned upside down, placed on a plain woven net having a warp wire diameter of 0.6 mm, a weft wire diameter of 0.75 mm, and a mesh number of 25 mesh, and jetting three times a columnar water stream with a water pressure of 3 MPa onto the fiber web. After the constituent fibers are entangled and rearranged, the moisture contained in the non-woven fabric is air-dried once, and then subjected to a heat treatment at 140 ° C. using a hot air penetration type drier to heat the sheath component of the heat-adhesive fiber. are adhered, with a basis weight of about 40 g / m ^2, MD directions about 1 mm, CD
An entangled nonwoven fabric having an oval opening of about 0.5 mm in the direction was obtained.

Examples 1 to 4 and Comparative Examples 1 to 2
Was used as a wiping sheet, and evaluated by the following items. [Wipeability] 2 g of 7 kinds of JIS dust are evenly spread on a glass surface, and a cleaning tool for flooring manufactured by Kao Corporation (wipe area 100 mm x 200 mm wide, pattern length 34)
0mm, weight 235g) MD direction 250mm, CD direction 2
Cut to a size of 10 mm, and add 20 parts of water to the weight of the nonwoven fabric.
Impregnated with 0 mass%, attached a non-woven fabric whose mass was measured in advance so that the CD direction is the horizontal direction of the cleaning tool, and placed a load of 500 g on the wiping surface, in a direction perpendicular to the horizontal direction of the cleaning tool. The nonwoven fabric was moved a distance of 60 cm (in the vertical direction) and reciprocated three times, and the mass of the nonwoven fabric was measured. The increase in the mass was defined as the wiping amount, and the wiping property was evaluated.

The wettable sheets obtained by impregnating the nonwoven fabrics of Examples 1 to 4 and Comparative Examples 1 and 2 with 200% by mass of water based on the weight of the nonwoven fabric were evaluated by the following items.

[Tactile Sensitivity] The wet sheet was grasped by hand, and the tactile sensation at that time was evaluated by 10 monitors. ：: Hand-held and soft. Δ: Hand-held feeling, but slightly hard. X: No hand feeling and hard.

[Stickness] MD sheet 3
The sheet was cut into 0 cm × 30 cm in the CD direction, the sheet was folded in four, and the amount of liquid remaining on the skin when the skin was wiped 1 was observed. ：: Remaining amount of liquid is appropriate. Δ: The liquid remaining amount is small. X: The liquid remaining amount is too large. Table 1 shows the physical properties of Examples 1 to 4 and Comparative Examples 1 and 2.

[0047]

[Table 1]

The nonwoven fabrics of Examples 1 to 4 are excellent in wiping properties when used as a wiping sheet, and are flexible when used as a wet sheet despite having a feeling of holding.
Since the ratio of the row width between the high fiber density region and the low fiber density region was 1.2 or less, the stickiness was small, and the surface area was good without stickiness. On the other hand, in Comparative Examples 1 and 2, the inclination of the high fiber density region and the low fiber density region was MD
Since it has no angle to the direction (0 °),
The wiping property when the CD direction was changed to the wiping direction was poor. In addition, since there is directivity in the MD direction, the texture is hard. Especially, in Comparative Example 1, the ratio of the high fiber density region is large, so that the contact area with the skin is large, and there is a sticky feeling.

[0049]

The entangled nonwoven fabric of the present invention has a pattern (A) row extending in the MD direction in which a low fiber density region exists at a desired angle with respect to the MD direction of the nonwoven fabric on the surface of the nonwoven fabric;
By inverting the pattern (B) row extending in the MD direction alternately and alternately in the CD direction,
It is excellent in designability having a certain repeating pattern, strength balance of nonwoven fabric, and functionality. When the high fiber density region and the low fiber density region are alternately repeated at an angle of 5 to 60 ° with respect to the MD direction of the nonwoven fabric, a regular uneven pattern is formed, which is excellent in aesthetic appearance and various. Excellent in function. On the surface of the nonwoven fabric, low fiber density regions alternately exist at an angle of 5 to 60 ° with respect to the MD direction of the nonwoven fabric, and the high fiber density region in the pattern (A) row and the high fiber density region in the pattern (B) row When these are shifted vertically with respect to the MD direction, a regular uneven pattern is formed, which is excellent in aesthetic appearance and excellent in various functions.

For example, in the case of a sanitary material, when it is used as a surface material, it has a small contact area with the skin, has a dry feeling, is excellent in liquid diffusibility, and has openings formed in rows of low fiber density regions. If it is, the liquid permeability is also excellent. When used as a back sheet for sanitary materials, it has a design property and excellent dimensional stability. When used as a packaging material, it has excellent design properties and dimensional stability, and is easily packaged.

The entangled nonwoven fabric of the present invention is also suitable as a wiping sheet. Since at least the low fiber density region has an angle with respect to the MD direction, it can be efficiently and uniformly contaminated in the high fiber density region. Can be collected and held in the low fiber density region. In addition, since the pattern (A) row and the pattern (B) row obtained by inverting the pattern (A) alternately exist in the CD direction, the high fiber density region and the low fiber density region have no unidirectionality in the entire nonwoven fabric. It has excellent dimensional stability and can be sufficiently wiped even if the number of times of wiping is small, regardless of the wiping direction. Further, when the high fiber density area of the two pattern rows and / or the low fiber density area of the two pattern rows form a V-shaped area, dirt can be evenly wiped off.

The entangled nonwoven fabric of the present invention is also suitable as a wettable sheet. At least the low fiber density region has an angle with respect to the MD direction, and the pattern (A) row and the pattern (B) obtained by inverting the pattern (A) row are reversed. ) Rows are alternately present in the CD direction, so there is no unidirectionality in the entire nonwoven fabric, an efficient non-uniformity, and an appropriate amount of liquid can be applied to an object such as skin, and dimensional stability. It is possible to obtain a wettable sheet which is excellent in liquid impregnating property, has less sticky feeling, and is excellent in touch feeling and hand feeling.

[Brief description of the drawings]

FIG. 1 shows an example of a surface structure of an entangled nonwoven fabric of the present invention.

FIG. 2 shows another example of the surface structure of the entangled nonwoven fabric of the present invention.

FIG. 3 shows another example of the surface structure of the entangled nonwoven fabric of the present invention.

FIG. 4 shows a surface view of a support used for producing the entangled nonwoven fabric of FIG.

5 shows a front view (back view of the support of FIG. 4) of a support used for manufacturing the entangled nonwoven fabric of FIG. 2.

FIG. 6 shows a surface view of a support used for producing the entangled nonwoven fabric of FIG.

[Explanation of symbols]

 1. 1. Entangled nonwoven fabric 2. High fiber density region 3. Low fiber density region 4. Pattern (A) column Pattern (B) column Boundary part 6 (A). Pattern (A) column boundary 6 (B). 6. Boundary part of pattern (B) column 7. V-shaped area Angle 9. 9. Shift in low fiber density region Overlap 11. Opening part 21. Warp yarn 22. Weft 23. Spiral wire 24. Lot line 25. Spiral pitch 26. Lot pitch

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2H006 DA06 3B074 AA01 AA02 AA08 AB01 AC03 CC03 4L047 AA12 AA21 AA27 AA28 BA03 BA09 BA24 BB01 BB09 BD02 CA10 CA12 CA14 CB07 CB10 CC03 CC12 CC16

Claims (16)

[Claims] 1. A nonwoven fabric in which a fiber material is entangled and composed of a high fiber density region and a low fiber density region, wherein the low fiber density region on the nonwoven fabric surface is oriented in the machine direction of the nonwoven fabric (hereinafter referred to as the MD direction). In the direction perpendicular to the MD direction, a pattern (A) row extending in the MD direction existing at an angle of 5 to 60 ° and a pattern (B) row extending in the MD direction obtained by inverting the pattern (A) row ( An entangled nonwoven fabric that is alternately and repeatedly present in the CD direction. 2. The entangled nonwoven fabric according to claim 1, wherein the high fiber density region and the low fiber density region alternately exist at an angle of 5 to 60 ° with respect to the MD direction of the nonwoven fabric on the surface of the nonwoven fabric. 3. A high fiber density area of the pattern (A) row and a high fiber density area of the pattern (B) row form a V-shaped area at a boundary between the pattern (A) row and the pattern (B) row. The entangled nonwoven fabric according to claim 1 or 2, which is formed. 4. At the boundary between the pattern (A) row and the pattern (B) row, the low fiber density area of the pattern (A) row and the low fiber density area of the pattern (B) row form a V-shaped area. The entangled nonwoven fabric according to claim 1 or 2, which is formed. 5. At the boundary between the pattern (A) row and the pattern (B) row, the low fiber density area of the pattern (A) row and the low fiber density area of the pattern (B) row in the MD direction. The entangled nonwoven fabric according to claim 1, wherein the nonwoven fabric is formed so as to be shifted vertically. 6. The entangled nonwoven fabric according to claim 1, wherein the row width of the pattern (A) row and the row width of the pattern (B) row are 10 to 50 mm. 7. The entangled nonwoven fabric according to claim 1, wherein a row width of at least one of the high fiber density region and the low fiber density region is 0.2 to 3 mm. 8. The entangled nonwoven fabric according to claim 7, wherein the ratio of the row width of the high fiber density area to the row width of the low fiber density area is 0.2 to 1.2. 9. The entangled nonwoven fabric according to claim 1, wherein an opening is formed in the low fiber density region. 10. A pattern (A) row and a pattern (B) row at the boundary between the pattern (A) row and the pattern (B) row have a column width of the pattern (A) row and a column width of the pattern (B) row. 70 for any smaller column width
The entangled nonwoven fabric according to claim 5, which overlaps with a width of not more than%. 11. The entangled nonwoven fabric according to claim 10, wherein the row width of the pattern (A) row and the row width of the pattern (B) row are 2 to 10 mm. 12. The low fiber density region has a row width of 0.2 to 3 mm.
The entangled nonwoven fabric according to claim 10, which is: 13. The entangled nonwoven fabric according to claim 1, wherein the fibrous material contains 10% by mass or more of hydrophilic fibers. 14. A fibrous material comprising a split composite fiber having a mass of 20 mass%.
% Or more. 15. A wiping sheet comprising the entangled nonwoven fabric according to any one of claims 1 to 14. 16. A wettable sheet comprising the entangled nonwoven fabric according to claim 1. Description: