JP7055068B2 - Wiping sheet - Google Patents

Description

The present invention relates to a wiping sheet.

Fibers made from thermoplastic resins are used for various purposes in the form of non-woven fabrics in which the fibers are entangled. For example, Patent Document 1 discloses a non-woven fabric composed of 20 to 80% by mass of a polyester fiber having a flat cross section and 20 to 80% by mass of a cellulosic fiber. This non-woven fabric has high liquid absorption and retention power and release property of liquids such as water and chemicals, and has moderate bulkiness and flexibility, so that it can be used for interpersonal cleaning and beauty. It is described in.

Patent Document 2 discloses a wet cleaning sheet having a base sheet in which a fiber aggregate and a mesh sheet are entangled and a cleaning liquid. It is described in the same document that this wet cleaning sheet has a macroscopic uneven pattern formed on its cleaning surface and is excellent in hair trapping performance.

International Publication No. 2014/132690 Pamphlet Japanese Unexamined Patent Publication No. 2017-113282

However, the non-woven fabric of Patent Document 1 is intended for cleaning for people and for beauty, and does not disclose any dust collecting property when the floor surface or the like is cleaned. Further, the cleaning sheet of Patent Document 2 has room for improvement in the collection performance of fine particle (dust) dirt.

Therefore, an object of the present invention is to provide a wiping sheet that solves the shortcomings of the prior art.

The present invention is a wiping sheet having a microscopic pattern of uneven portions on at least one surface and having a fiber aggregate containing irregularly shaped fibers having a flat cross section.
In the concave and convex portions constituting the uneven portion, the deformed fiber existing in the concave portion has the major axis of the cross section substantially oriented in the direction along the surface of the wiping sheet, and the deformed shape existing in the convex portion. Provided is a wiping sheet in which the major axis of the cross section of the fiber is substantially oriented in a direction along a plane orthogonal to the plane of the wiping sheet.

According to the present invention, it is possible to provide a wiping sheet having both a high collection property of fine particle stains and a high collection property of fiber stains such as hair.

1 (a) and 1 (b) are plan views of the cross-sectional shape of the deformed fiber used in the wiping sheet of the present invention. FIG. 2 is a schematic view showing an embodiment of the wiping sheet of the present invention. FIG. 3 (a) is an observation image with a scanning electron microscope in the recess of the wiping sheet using the deformed fiber having the cross-sectional shape shown in FIG. 1 (b), and FIG. 3 (b) is FIG. 1 (b). It is an observation image by the scanning electron microscope in the convex part of the wiping sheet using the deformed fiber which has the cross-sectional shape shown in b). 4 (a) to 4 (e) are enlarged views of a main part of a linear recess in the wiping sheet of the present invention. FIG. 5 is a schematic view of a manufacturing apparatus suitably used for manufacturing the wiping sheet of the present invention. FIG. 6 is a schematic view of the uneven portion forming member in the manufacturing apparatus shown in FIG. FIG. 7 is a schematic view showing the orientation of the cross section of the deformed fiber at the time of manufacturing the wiping sheet. 8 (a) is a schematic view of a linear recess forming member in the manufacturing apparatus shown in FIG. 5, and FIG. 8 (b) is a cross-sectional view taken along the line AA in FIG. 8 (a).

Hereinafter, the wiping sheet of the present invention will be described based on the preferred embodiment thereof. In the present invention, "wiping" includes both cleaning and cleaning, for example, cleaning of buildings such as floors, walls, ceilings and pillars, cleaning of fittings and equipment, wiping of articles, and the like. Includes cleaning of the body and equipment related to the body.

The wiping sheet of the present invention contains deformed fibers, and preferably includes a fiber aggregate mainly composed of deformed fibers. In the deformed fibers, the fibers are deposited, entangled or combined to form a fiber aggregate. The fibers constituting the fiber aggregate may or may not be fused to each other. From the viewpoint of increasing the degree of freedom of the fibers and increasing the efficiency of collecting dirt, it is preferable that the fibers constituting the fiber aggregate are not fused to each other. "Mainly" means that the fiber aggregate constituting the wiping sheet contains 50% by mass or more of deformed fibers.

When focusing on one fiber aggregate, the wiping sheet of the present invention may be composed of a single layer of fiber aggregates containing deformed fibers, or a layer containing deformed fibers and a layer not containing deformed fibers. It may be composed of a fiber aggregate having a multi-layer structure with and. Further, the wiping sheet of the present invention may be composed of a fiber aggregate having a multilayer structure including a layer containing a first deformed fiber and a layer containing a second deformed fiber different from the first deformed fiber. ..

The wiping sheet of the present invention may be composed of only one fiber aggregate (single layer or multilayer) containing the deformed fiber, or the first fiber aggregate containing the deformed fiber and the deformed fiber. It may have a multi-ply laminated structure in which a second fiber aggregate that does not contain the fiber aggregate or a sheet material other than the fiber aggregate is superposed. Examples of the fiber aggregate include non-woven fabric, woven fabric, and paper.

The proportion of the deformed fibers in the wiping sheet of the present invention is a viewpoint of achieving both the collection property of fine particle stains and the collection property of fiber stains such as hair when the wiping sheet is composed of a fiber aggregate having a single layer structure. Therefore, it is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more. The fibers that can be contained in the wiping sheet of the present invention other than the deformed fibers are fibers having a perfect circular cross section (in the present specification, the fibers having a perfect circular cross section are also referred to as "non-deformed fibers"). .. When the wiping sheet is composed of a fiber aggregate having a single-layer structure, such non-deformed fibers are contained in a proportion of at most preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably. Is contained in a proportion of 30% by mass or less.

The deformed fiber included in the wiping sheet of the present invention refers to a fiber having a flat cross section (a cross section orthogonal to the length direction of the fiber). When the cross section of the fiber is flat, the cross section of the fiber is orthogonal to the line segment and crosses the cross section, where A is the length of the longest line segment among the line segments crossing the cross section. When the length of the longest line segment among the line segments is B, the length A is longer than the length B. That is, the deformed fiber has a major axis and a minor axis in its cross section. The deformed fiber is preferably axisymmetric with a line segment of length A as a line of symmetry.

Examples of the deformed fiber having a cross-sectional shape of such a fiber include those having a cross-sectional shape such as an elliptical shape shown in FIG. 1 (a) and a multi-leaf shape shown in FIG. 1 (b). In the deformed fiber having an elliptical cross-sectional shape of the fiber shown in FIG. 1 (a), the length A is the major axis of the ellipse and the length B is the minor axis of the ellipse (hereinafter, in the present specification, the deformed fiber). The length A is also referred to as a "major axis" and the length B is also referred to as a "minor axis" regardless of the cross-sectional shape of the above. Since the deformed fiber has such a cross section, the bending rigidity of the constituent fibers can be made anisotropic, and as a result, fiber stains such as hair can be easily entangled.

Specifically, the deformed fiber has flexural rigidity in the cross section thereof in the direction along the major axis (hereinafter, also referred to as the major axis direction) and in the direction along the minor axis (hereinafter, also referred to as the minor axis direction). There is a difference in (EI). The flexural rigidity (EI) is expressed by the product of the Young's modulus (E) of the constituent material and the moment of inertia of area (I) determined by the cross-sectional shape and size of the fiber. Since the deformed fiber is composed of the same material and has a constant Young's modulus, the bending rigidity of the deformed fiber is determined by the magnitude of the moment of inertia of area in the cross section of the deformed fiber. The moment of inertia of area in the cross section of the deformed fiber is large in the major axis direction and smaller in the minor axis direction of the cross section. Therefore, the deformed fiber exhibits high flexural rigidity by abutting on the surface to be cleaned so that the angle between the major axis direction and the surface to be cleaned in its cross section is substantially right angle. Due to this, it is possible to scrape and catch the fiber stains existing on the surface to be cleaned. Further, the deformed fiber abuts on the surface to be cleaned so that the angle between the minor axis direction and the surface to be cleaned in the cross section is substantially right angle, so that the bending rigidity is lower than that in the major axis direction. .. Due to this, fiber stains can be entangled. As described above, the wiping sheet can effectively enhance the collection performance of fiber stains by containing the deformed fibers.

As described above, the relationship between the major axis of the deformed fiber contained in the wiping sheet and the angle formed by the surface of the wiping sheet in the cross section is important from the viewpoint of the collection performance of fiber stains. When focusing on the orientation of the cross section of the deformed fiber (hereinafter, this orientation is also referred to as "fiber cross section orientation"), the angle between the major axis in the cross section and the surface of the wiping sheet is less than 45 degrees. If the abundance ratio is 50% or more as a reference for the number of fibers, "the major axis of the cross section is generally oriented in the direction along the surface of the wiping sheet", and the angle formed by the major axis in the cross section and the surface of the wiping sheet is When the abundance ratio of the deformed fibers having a temperature of 45 degrees or more is 50% or more as the number ratio, it is defined as "the major axis of the cross section generally faces the direction along the plane orthogonal to the plane of the wiping sheet".

From the viewpoint of realizing effective collection of fine particle stains in addition to effective collection of fiber stains such as hair, the deformed fiber used in the present invention has a convex shape having a sharp top in its cross-sectional shape. It preferably has at least one portion, more preferably two or more portions, and even more preferably three or more portions. The sharp top is defined as (b) one straight line and one when the contour of the convex portion in the cross-sectional shape of the deformed fiber is defined by (a) two non-parallel straight lines intersecting. There are cases where the image is formed by intersecting the curves of (c), and cases where the image is formed by the intersection of the two curves (c). For example, the deformed fiber shown in FIG. 1 (b) has eight sharp tops. The sharp apex preferably extends in a direction intersecting the major axis and preferably in a direction orthogonal to the major axis. In the present invention, one kind of deformed fiber may be used alone, or two or more kinds of deformed fibers having different cross-sectional shapes may be used in combination. As for other irregularly shaped fibers having a sharp top, the cross-sectional shape thereof is, for example, a triangular shape, a convex polygon such as a quadrangle, a pentagon, and a hexagon, provided that they have a ratio of a major axis to a minor axis, which will be described later. It may be a star-shaped polygon, a W-shaped shape, or the like.

In particular, even when one type of deformed fiber is used alone, from the viewpoint of increasing the specific surface area of the constituent fibers and improving the collecting property of fine particles, in addition to the collecting property of fiber stains such as hair, FIG. 1 ( As shown in b), when the contour line in the cross section of the deformed fiber is viewed along the circumferential direction, it has a plurality of convex portions P and concave portions R located between adjacent convex portions P. Is preferable.

As shown in FIG. 2, the wiping sheet of the present invention composed of the fiber aggregate containing the above-mentioned deformed fibers is a substantially rectangular sheet having a longitudinal direction X and a width direction Y orthogonal to the longitudinal direction X. As shown in the figure, the wiping sheet 1 has an uneven portion of a macroscopic pattern having a curved portion on at least one surface thereof. From the viewpoint of effectively collecting fiber stains and fine particle stains such as hair, it has a macroscopic pattern uneven portion having a curved portion on the surface side used as a wiping surface (a surface in contact with the surface to be wiped). Is more preferable.

As shown in the figure, a concave portion 3 and a convex portion 4 constituting the uneven portion are formed on one surface of the wiping sheet 1. The boundary line between the concave portion 3 and the convex portion 4 has a curved portion when viewed macroscopically. When the uneven portion of the macroscopic pattern is formed on one surface, the other surface is flat without forming the uneven portion derived from the uneven portion of the macroscopic pattern.

The uneven portion of the macroscopic pattern is not limited to the macroscopic pattern shown in the figure, and for example, the macroscopic pattern shown in Japanese Patent Application Laid-Open No. 2017-11328 and figures such as straight lines, curves, circles, and polygons are appropriately combined. It may be a macroscopic pattern. From a macroscopic point of view, the curved shape is a figure that constitutes an uneven portion except for a curve that constitutes a microscopic fine hole and a curve that constitutes a drainage hole having a diameter of about 1.5 to 2 mm. It means that it can be visually confirmed that a part of the side is a curved line, and from such a viewpoint, the area of each convex portion 4 surrounded by the concave portion 3 is 300 mm ² or more. It is preferable to form the concave portion 3 and the convex portion 4. Having such an uneven portion of a macroscopic pattern also has an advantage of enhancing the design of the wiping sheet itself.

The wiping sheet of the present invention has a concave portion 3 and a convex portion constituting the uneven portion of the macroscopic pattern due to the fact that the cross section of the deformed fiber which is the constituent fiber has a flat shape having a major axis and a minor axis. In part 4, the fiber orientation is different. Specifically, the deformed fibers existing in the concave portion 3 are oriented so that the flat surface thereof faces the surface of the wiping sheet (direction of the paper surface in FIG. 2), and the deformed fibers existing in the convex portion 4 are flattened thereof. The surface is oriented so as to face the surface orthogonal to the surface of the wiping sheet (the surface orthogonal to the paper surface in FIG. 2).

In other words, the deformed fiber existing in the concave portion 3 has a major axis in its cross section generally oriented in the direction along the surface of the wiping sheet, and the deformed fiber existing in the convex portion 4 has a minor diameter in its cross section. It faces the direction along the surface of the wiping sheet. In this way, by allowing a plurality of regions having different orientations of the flat surfaces of the deformed fibers to exist on the wiping surface of the wiping sheet, the collectability of fine particle stains due to the high degree of freedom of the fibers and the hair due to the rigidity of the fibers. It is possible to achieve both the ability to collect fiber stains such as the above.

"The major axis of the cross section of the deformed fiber is generally oriented in the direction along the surface of the wiping sheet" means that when 10 or more deformed fibers are observed, 50% or more of the deformed fibers (based on the number of fibers). However, it means that the angle formed by the major axis of the deformed fiber and the surface of the wiping sheet is less than 45 degrees (hereinafter, this is also referred to as "major axis orientation"). In addition, "the major axis of the cross section of the deformed fiber is generally oriented in the direction along the plane orthogonal to the plane of the wiping sheet" means that 50% of the deformed fibers are observed when 10 or more deformed fibers are observed. (Based on the number of fibers) The above means that the angle between the major axis of the deformed fiber and the surface of the wiping sheet is 45 degrees or more (hereinafter, this is also referred to as "minor axis orientation").

From the viewpoint of enhancing the collection of fine particle stains, the ratio of the major axis of the cross section of the deformed fibers existing in the recesses in the macroscopic pattern toward the direction along the surface of the wiping sheet is the number of the deformed fibers. As a standard, 50% or more is preferable, 60% or more is further preferable, 100% or less is more preferable, 80% or less is further preferable, and specifically, 50% or more and 100% or less is preferable, and 60% or more and 80% or less. Is more preferable.

From the viewpoint of enhancing the collection of fiber stains such as hair, the major axis of the cross section of the deformed fiber existing in the convex portion in the macroscopic pattern is oriented toward the direction orthogonal to the surface of the wiping sheet. As a standard for the number of deformed fibers, the ratio is preferably 50% or more, more preferably 60% or more, further preferably 100% or less, further preferably 80% or less, and specifically, 50% or more and 100% or less. It is preferable, and more preferably 60% or more and 80% or less. The orientation ratio can be calculated from the number of deformed fibers that satisfy the above-mentioned orientation criteria by observation using a scanning electron microscope (SEM).

The orientation of the deformed fiber in the cross section (fiber cross-section orientation) is the deformed fiber observed on the measurement target surface of the wiping sheet after measuring the major axis and the minor axis of the cross section of the deformed fiber constituting the fiber aggregate. It can be calculated by measuring the fiber diameter of. These major axis, minor axis and fiber diameter can be observed with a scanning electron microscope (SEM) and measured by, for example, the following method.

3 (a) and 3 (b) show the wiping surface of the wiping sheet when the deformed fiber (major diameter 20.0 μm, minor diameter 9.0 μm) having the cross-sectional shape shown in FIG. 1 (b) is used. Is shown in the image observed with a scanning electron microscope (SEM). When the fiber width (major axis 20.0 μm × sin45 ° = 14.1 μm) observed when the angle between the major axis of the deformed fiber and the surface of the wiping sheet is 45 degrees is used as the reference for fiber cross-sectional orientation, it is macroscopic. 60% or more of the irregularly shaped fibers existing in the concave portions 3 in the uneven portion of the target pattern exceed the standard of fiber cross-sectional orientation as a standard for the number of fibers, and many fibers are oriented in the major axis (FIG. 3 (a). )reference). On the other hand, 70% or more of the deformed fibers 2 existing in the convex portion 4 in the uneven portion of the macroscopic pattern are below the standard of fiber cross-sectional orientation based on the number of fibers, and many fibers are oriented on the minor axis. (See FIG. 3 (b)).

From the viewpoint of excellent collection of fine particle stains and collection of fiber stains such as hair on a wet surface to be cleaned, the wiping sheet of the present invention has the unevenness of the macroscopic pattern shown in FIG. In addition to the portion, it is preferable that a linear recess 5 recessed from one surface of the wiping sheet 1 toward the other surface is formed. The linear recesses 5 extend linearly, and a plurality of linear recesses 5 are formed so as to face one direction. In FIG. 4A and FIG. 4A, a plurality of directions in which the linear recess 5 extends are formed along the longitudinal direction X of the wiping sheet 1, but the “one direction” is a reference direction (for example,). The effect of the present invention is exhibited when the angle formed by the longitudinal direction X) and the linear recess 5 in the figure is preferably 45 degrees or less, more preferably less than 30 degrees, still more preferably less than 20 degrees.

As a form of forming the linear recess 5 other than those shown in FIGS. 2 and 4A, as shown in FIG. 4, for example, one linear recess 5 along a reference direction (longitudinal direction X in FIG. 4). When looking at the row 5L, (i) the adjacent linear recesses 5 are line-symmetrical with the direction orthogonal to the reference direction (the middle width direction Y in the same figure) as the axis of symmetry 5S (FIG. 4). (A), (b) and (c)), (ii) A plurality of linear recesses 5 are formed so as to extend in substantially the same direction (see FIG. 4D). (Iii) A row 5L of two linear recesses 5 extending along a reference direction (for example, the longitudinal direction X in the figure) and adjacent to each other in a direction orthogonal to the reference direction (width direction Y in the figure). , 5L may be line-symmetrical with the reference direction (longitudinal direction X) as the axis of symmetry 5A (see FIG. 4C). These embodiments may be combined as long as the effects of the present invention are exhibited.

In the wiping sheet 1 shown in FIG. 2, a plurality of linear recesses 5 are arranged in series at intervals in the extending direction (longitudinal direction X in the figure), forming a row of linear recesses 5. There is. The rows of the linear recesses 5 are arranged in a plurality of rows at intervals in the width direction Y of the wiping sheet 1. The linear recesses 5 may have the same length or may have different lengths. Further, the distances between the rows of the linear recesses 5 may be the same or different. FIG. 2 shows a state in which rows of a plurality of linear recesses 5 composed of a plurality of linear recesses 5 having the same length are arranged at substantially equal intervals, and the linear recesses 5 extend. The positions of the two ends of the linear recesses 5 adjacent to each other in the direction orthogonal to the direction coincide with each other in the X direction.

The linear recess 5 may be formed on both sides of the wiping sheet, or may be formed on only one surface of the sheet. Further, when the linear recess 5 is formed on the surface of the wiping sheet on the side having the uneven portion of the macroscopic pattern, it may be formed on the entire surface of the sheet, and is formed only on the recess 3 of the macroscopic pattern of the sheet. It may be formed only on the convex portion 4 of the macroscopic pattern of the sheet. When the linear concave portion 5 is formed on one surface of the wiping sheet, a linear convex portion complementary to the linear concave portion 5 may be formed on the other surface, and the linear convex portion is not formed. It may be flat.

From the viewpoint of improving the collection property of fine particle stains in addition to the collection property of fiber stains such as hair, the linear recess 5 is formed from the surface side on which the uneven portion of the macroscopic pattern is formed to the other surface. It is preferable that it is formed so as to be recessed toward the surface, and it is more preferable that the linear recess is formed only in the convex portion of the macroscopic pattern of the wiping sheet.

The wiping sheet in which the linear recess 5 is formed has different orientation directions in the cross section of the deformed fibers existing around the linear recess 5, so that the fine particle stains can be collected and the fiber stains such as hair can be captured. It is excellent in terms of both collectability. In particular, when the wiping sheet of the present invention is used on a wet cleaning target surface such as a changing room, a washroom, or a kitchen near a bathroom, the collection property of fiber stains such as hair is further improved. As shown in FIG. 4 (e), in the linear recess 5, the region located between the two adjacent linear recesses 5 and 5 in the direction orthogonal to the extending direction of the linear recess 5 is defined as the first region 7. Occasionally, the deformed fibers present in the first region 7 are oriented in a direction along a plane in which the major axis of the cross section of the fibers is orthogonal to the plane of the wiping sheet. That is, the deformed fibers existing in the first region 7 have a minor axis orientation.

In addition to the deformed fibers existing in the first region 7 having the orientation in the above-mentioned cross section, the deformed fibers in the first region 7 have the major axis of the cross section of the fiber with the surface of the wiping sheet 1. The proportion of the fibers oriented in the direction along the orthogonal planes is oriented in the direction along the plane in which the major axis of the cross section of the deformed fiber existing in the convex portion 4 in the macroscopic pattern is orthogonal to the plane of the wiping sheet 1. It is higher than the ratio of doing. That is, the deformed fibers existing in the first region 7 have a higher proportion of the deformed fibers having a minor axis orientation than the deformed fibers existing in the convex portion 4 in the macroscopic pattern.

Specifically, the ratio of the deformed fibers existing in the first region 7 oriented toward the direction in which the major axis of the cross section of the fibers is oriented along the plane orthogonal to the plane of the wiping sheet 1 is based on the number of deformed fibers. 50% or more is preferable, 60% or more is further preferable, 100% or less is more preferable, 80% or less is further preferable, and specifically, 50% or more and 100% or less is preferable, and 60% or more and 80% or less is preferable. More preferred. These orientation ratios can be calculated by the above-mentioned SEM observation.

The length L1 of the linear recess 5 (see FIG. 4E) is preferably 1 mm or more, preferably 3 mm or more, when the dimensions of the wiping sheet are a substantially rectangular shape of 285 mm × 205 mm as described in the examples. It is more preferably 50 mm or less, and further preferably 20 mm or less. Similarly, the width W1 of the linear recess 5 (see FIG. 4E) is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 10 mm or less. It is more preferably 5 mm or less. Similarly, the depth of the linear recess 5 in the sheet thickness direction is preferably 0.01 mm or more, more preferably 0.1 mm or more, and preferably 5 mm or less, and 2 mm or less. Is more preferable.

The distance L2 between the two adjacent linear recesses 5 and 5 in the direction orthogonal to the extending direction of the linear recess 5 (see FIG. 4 (e)) is 285 mm × 205 mm as described in the embodiment of the dimensions of the wiping sheet. When it is made into a substantially rectangular shape, it is preferably 0.1 mm or more, more preferably 0.5 mm or more, still more preferably 30 mm or less, still more preferably 10 mm or less. Similarly, the distance L3 (see FIG. 4E) between two adjacent linear recesses 5 and 5 in the extending direction of the linear recess 5 is preferably 0.1 mm or more, preferably 0.5 mm or more. It is more preferably 30 mm or less, and further preferably 10 mm or less.

Focusing on the extending direction of the deformed fibers constituting the wiping sheet 1, as shown in FIG. 4 (e), the region located between the two adjacent linear recesses 5 in the extending direction of the linear recess 5 is the second region. When set to 8, the deformed fiber existing in the first region 7 is oriented in the fiber length direction along the extending direction of the linear recess 5 as compared with the deformed fiber existing in the second region 8. Is preferable. In the figure, the deformed fibers existing in the first region 7 are more likely to be oriented along the longitudinal direction X, which is the extending direction of the linear recess 5, than the deformed fibers existing in the second region 8. Due to the orientation of the deformed fibers in this way, when the wiping sheet of the present invention is moved along the width direction Y and wiped, the contact area between the fiber surface of the deformed fibers and the surface to be wiped becomes high. Therefore, it is possible to make it easier to entangle fine particle stains and fiber stains such as hair existing on the surface to be wiped, and as a result, the collectability of fine particle stains and fiber stains such as hair becomes higher.

The ratio of the deformed fibers existing in the first region 7 in which the fiber length direction is oriented along the extending direction of the linear recess 5 is preferably 50% or more, preferably 60%, based on the number of deformed fibers. The above is more preferable, 100% or less is preferable, 90% or less is further preferable, specifically, 50% or more and 100% or less is preferable, and 60% or more and 90% or less is further preferable.

The proportion of the deformed fibers existing in the second region 8 in which the fiber length direction is oriented along the extending direction of the linear recess 5 is in the deformed fibers existing in the first region 7 and the second region 8. On condition that the ratio of the linear recesses 5 oriented along the extending direction satisfies the above relationship, 0% or more is preferable, 10% or more is more preferable, and 50% or less is used as a reference for the number of deformed fibers. Is more preferable, 40% or less is more preferable, and specifically, 0% or more and 50% or less is preferable, and 10% or more and 40% or less is further preferable. The ratio of the deformed fiber oriented along the extending direction of the linear recess 5 is, for example, the target portion of the sample whose direction is clear is observed by SEM, and the angle formed by the extending direction of the linear recess 5 and the fiber is 45 degrees or more. The number of fibers can be measured.

The deformed fiber is preferably composed of a fiber-forming resin as a raw material. Examples of such resins include various thermoplastic resins. Examples of the thermoplastic resin include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamide resins, vinyl resins such as polyvinyl chloride and polystyrene, and acrylic resins such as polyvinyl chloride and methyl methacrylate. , Fluororesin such as polyvinylfluoroethylene, etc., and one of these can be used alone or in combination of two or more.

The fineness of the deformed fiber contained in the wiping sheet is preferably 0.5 dtex or more, more preferably 1 dtex or more, and 1.2 dtex or more, from the viewpoint of operability at the time of wiping and the efficiency of collecting dirt. It is more preferably 4 dtex or less, more preferably 3.5 dtex or less, and further preferably 3 dtex or less.

The fiber length of the deformed fiber depends on the method for producing the fiber, but is generally preferably 1 mm or more and 100 mm or less, more preferably 10 mm or more and 90 mm or less, and further preferably 20 mm or more and 60 mm or less.

The ratio (A / B) of the length A to the length B described above is preferably 1.2 or more, more preferably 1.5 or more, still more preferably 2 or more, and the ratio thereof. The upper limit is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less. Specifically, the A / B value is preferably 1.2 or more and 5 or less, more preferably 1.5 or more and 4 or less, and further preferably 2 or more and 3 or less. By having such a structure, the fibers constituting the wiping sheet are easily entangled with fiber stains such as hair, and these stains can be caught on the fibers and removed from the surface to be wiped.

From the viewpoint of having both operability at the time of wiping and collecting dirt, the length A is preferably 1 μm or more, preferably 5 μm or more, provided that the above-mentioned range of A / B is satisfied. It is more preferably 10 μm or more, and the upper limit thereof is preferably 80 μm or less, preferably 50 μm or less, and preferably 25 μm or less. From the same viewpoint, the length B is preferably 0.2 μm or more, more preferably 1 μm or more, and further preferably 2 μm or more, provided that the above-mentioned range of A / B is satisfied. It is preferable, and the upper limit thereof is preferably 40 μm or less, preferably 20 μm or less, and preferably 15 μm or less.

As shown in FIG. 1 (b), when the contour line in the cross section of the deformed fiber is viewed along the circumferential direction, it has a plurality of convex portions P and concave portions R located between adjacent convex portions P. In the case of a shape, when the length of the line segment connecting the vertices of the adjacent convex portions P is C, and the length of the perpendicular line drawn from the line segment to the bottom position of the concave portion R is D (FIG. 1 (FIG. 1). b)), the C / D value is preferably 0.1 or more, more preferably 1 or more, further preferably 2 or more, and the upper limit thereof is preferably 5 or less. It is more preferably 4 or less, and further preferably 3 or less. By having such a configuration, the surface area of the fiber alone is increased and the contact area with dirt is increased, so that the ability to collect dirt can be further improved.

When observing the cross section of the deformed fiber, if the length C of the line segment connecting the vertices of the adjacent convex portions P selected arbitrarily is different, the value of C for calculating the value of C / D is all. Let it be the average value of the values of C. Similarly, when the lengths of the perpendicular lines in the arbitrarily selected recess R are different from each other, the value of D for calculating the value of C / D is the average value of all the values of D. When referring to the values of C and D in the following description, the values are the average values of C and D.

From the viewpoint of improving operability at the time of wiping and collecting efficiency of dirt, the length C is preferably 0.1 μm or more, preferably 0.5 μm or more, provided that the above-mentioned C / D range is satisfied. It is more preferably 1 μm or more, and the upper limit thereof is preferably 20 μm or less, preferably 10 μm or less, and preferably 5 μm or less. From the same viewpoint, the length D is preferably 0.1 μm or more, more preferably 0.5 μm or more, and more preferably 1 μm or more, provided that the above-mentioned C / D range is satisfied. Is more preferable, and the upper limit thereof is preferably 20 μm or less, preferably 10 μm or less, and preferably 5 μm or less.

The above-mentioned lengths A to D can be measured by the following measuring methods. That is, the prepared fiber aggregate was cut using a razor or the like while maintaining the cross-sectional shape of the fiber, and then the cross section was vacuum-deposited with Pt. Using a scanning electron microscope (JSM-IT100, manufactured by JEOL Ltd.), observe the cross section of the Pt-deposited fiber aggregate at a magnification of 500 to 1000 times, and use the length measurement tool of the attached software to observe the above in the fiber cross section. Lengths A to D were measured respectively.

When the wiping sheet of the present invention contains fibers having a perfect circle (non-deformed) cross section, the fineness of the fibers shall be 0.6 dtex or more from the viewpoint of operability during wiping and dirt collection efficiency. Is more preferable, 1.0 dtex or more is more preferable, and 1.2 dtex or more is further preferable. Further, it is preferably 4.0 dtex or less, more preferably 3.5 dtex or less, and further preferably 3.0 dtex or less.

The wiping sheet of the present invention may be composed of only deformed fibers, or may further contain other fibers. As the other fibers, natural fibers such as wood pulp, cotton and silk, recycled fibers such as rayon and cupra, hydrophilic fibers such as purified fibers such as lyocell, and the above-mentioned thermoplastic resin can be used as raw materials thereof. can. These raw materials can be used alone or in combination of two or more. The cross section of the other fiber may be a perfect circle (non-deformed) or flat (deformed). When the wiping sheet is composed of a fiber aggregate having a single layer structure, the other fibers are preferably contained in a proportion of 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less. It is contained in.

From the viewpoint of making the strength of the wiping sheet appropriate, the basis weight of the fiber aggregate constituting the wiping sheet is preferably 40 g / m ² or more, more preferably 45 g / m ² or more, and further preferably 50 g / m ² or more. It is preferable, and the upper limit thereof is preferably 140 g / m ² or less, more preferably 100 g / m ² or less, still more preferably 80 g / m ² or less. Specifically, the basis weight of the fiber aggregate constituting the wiping sheet is preferably 40 g / m ² or more and 140 g / m ² or less, more preferably 45 g / m ² or more and 100 g / m ² or less, and 50 g / m ² or more. 80 g / m ² or less is more preferable.

From the same viewpoint, the thickness of the wiping sheet is preferably 0.5 mm or more, more preferably 1.0 mm or more under a load of 40 N / m ² , and the upper limit thereof is 2 under the same load. It is preferably 5.5 mm or less, and more preferably 3 mm or less.

The wiping sheet may be used as it is (so-called dry mode) at the time of wiping, or may be used in a mode in which a cleaning liquid is applied, sprayed, supported or impregnated into the fiber aggregate (so-called wet mode). You may. These modes can be selected according to the type of dirt adhering to the surface to be wiped and the physical properties of the object to be wiped. From the viewpoint of increasing the cleaning efficiency on the surface to be wiped, it is preferable that the cleaning liquid is supported on the fiber aggregate constituting the wiping sheet. Since the fiber aggregate contains the deformed fibers, the voids between the fibers can be increased, and as a result, the liquid retention property of the cleaning liquid in the wiping sheet is improved. In particular, the wiping sheet of the present invention is a wet type, even when the wiping sheet is used for a wet cleaning target surface such as a changing room, a washroom, and a kitchen near a bathroom, such as hair. It is possible to make it easier to entangle the fiber stains.

When the wiping sheet is used in a wet manner at the time of wiping, the cleaning liquid supported on the sheet uses a general composition used for a wet wiping sheet, such as water alone or an aqueous solution containing an additive. be able to. Examples of the additive used in the cleaning liquid include surfactants, bactericides, fragrances, fragrances, deodorants, pH adjusters, alcohols, abrasive particles and the like.

From the viewpoint of giving the wiping sheet practically sufficient strength, it is preferable that the wiping sheet of the present invention further includes a scrim net for supporting the fiber aggregates constituting the sheet. From the same viewpoint, it is also preferable that the scrim net is arranged in the central region in the thickness direction of the fiber aggregate. The scrim net can be integrally entangled with the deformed fibers constituting the fiber aggregate, and may be in the form of a net, a lattice, a strand, or the like.

A resin can be used as a raw material constituting the scrim net. Examples of the resin include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon 6 and nylon 66, acrylonitrile resins such as polyacrylonitrile, vinyl resins such as polyvinyl chloride and polystyrene, and poly. A vinylidene-based resin such as vinylidene chloride can be used.

From the viewpoint of achieving both the entanglement of the deformed fibers and the scrim and the strength of the wiping sheet, the wire diameter (diameter in the cross section) of the scrim can be appropriately adjusted according to the degree of entanglement of the fibers, but is 10 μm or more. It is preferably 500 μm or more, more preferably 2000 μm or less, and even more preferably 1000 μm or less. The wire diameters of the scrims may be partially different or the same, and when the wire diameters are partially different, the wire diameters of the scrims shall be the average value. The basis weight of the scrim is preferably 1 g / m ² or more, more preferably 3 g / m ² or more, more preferably 20 g / m ² or less, still more preferably 10 g / m ² or less.

The above has been described with respect to one embodiment of the wiping sheet of the present invention, and a suitable method for manufacturing the wiping sheet will be described below with reference to FIG. FIG. 5 shows a manufacturing apparatus 10 preferably used for manufacturing a wiping sheet. The manufacturing apparatus 10 includes a web forming portion 20, a water flow entanglement portion 30, and a pattern forming portion 40 in this order along the transport direction (MD direction). The present manufacturing method is roughly divided into two steps, a step of forming a fiber aggregate containing irregular fibers by water flow entanglement and a step of forming an uneven portion of a macroscopic pattern on one surface of the fiber aggregate. In the following description, the transport direction (MD direction) and the longitudinal direction X coincide with each other, and the direction orthogonal to the transport direction and the width direction Y coincide with each other.

First, the web of the deformed fiber 2 is unwound from the card machine 21 in the web forming unit 20 via the guide roll 22. When the wiping sheet is provided with a scrim, the scrim 15 is unwound from the scrim roll 25 together with the web of the deformed fiber 2. By these feedings, webs and scrims of deformed fibers are laminated.

Next, in the water flow confounding portion 30, the web of the deformed fiber 2 (or the laminate of the web of the deformed fiber 2 and the scrim 15) is conveyed in the MD direction by the first support belt 32 through which water can permeate, and the first water flow is carried out. The entanglement process is performed by the high-pressure water flow ejected from the nozzle 31 (entanglement step). By going through this step, the deformed fibers 2 are entangled with each other to form a fiber aggregate 1A containing the deformed fibers. In the case of providing a scrim, by this step, the deformed fibers 2 are entangled with each other, and the deformed fibers 2 and the scrim 15 are integrally entangled, and the fiber aggregate 1A of the deformed fibers in which the scrim is arranged is provided. Is formed. In this step, the water pressure sprayed from the first water flow nozzle 31 is preferably 30 kg / cm ² or more and 80 kg / cm ² or less, more preferably 40 kg / cm ² or more and 60 kg / cm ² or less, and the MD of the web of the deformed fiber 2. It can be manufactured by setting the transport speed in the direction to preferably 2 m / min or more and 10 m / min or less, and more preferably 4 m / min or more and 8 m / min or less.

Subsequently, in the pattern forming portion 40, a high-pressure water stream is sprayed on the fiber aggregate 1A containing the deformed fibers to form an uneven portion of a macroscopic pattern on one surface of the fiber aggregate (pattern forming step). The water pressure sprayed from the second water flow nozzle 41 and the transport speed of the fiber aggregate can be in the same range as in the entanglement step.

In this step, as shown in FIG. 5, a high-pressure water flow is blown from the second water flow nozzle 41 onto one surface of the fiber aggregate 1A conveyed from the water flow entanglement portion 30. At this time, by arranging a concavo-convex portion forming member 50 having a structure as shown in FIG. 6, for example, between the fiber aggregate 1A and the second support belt 42, the high-pressure water flow of the fiber aggregate 1A is sprayed. It is possible to form the concave portion 3 and the convex portion 4 complementary to the uneven shape of the uneven portion forming member 50 on the surface opposite to the surface to be formed. The uneven portion forming member 50 is made of metal or synthetic resin.

Specifically, the water flow sprayed from the second water flow nozzle 41 toward the upper surface side of the fiber aggregate 1A presses the lower surface thereof so as to be in close contact with the upper surface of the concave portion forming convex portion 50a of the uneven portion forming member 50. .. At the same time, the deformed fiber 2 which is a constituent fiber of the fiber aggregate 1A located in the concave portion 50b for forming the convex portion of the uneven portion forming member 50 is projected into the concave portion 50b, and the concave portion forming member 50 is formed. The deformed fiber 2 located at the convex portion 50a is depressed in the thickness direction of the aggregate. The water sprayed in the water flow confounding is permeated downward through the concave portion 50b for forming the convex portion in the concave-convex portion forming member 50 and the drain holes 50c provided in the plurality of convex portions 50a for forming the concave portion. This makes it possible to form uneven portions of a macroscopic pattern having curved portions on one surface of the wiping sheet.

The wiping sheet of the present invention contains irregularly shaped fibers having a flat cross section as its constituent fibers, and therefore, the orientation of the deformed fibers in the concave portions 3 and the convex portions 4 formed in the pattern forming step in the cross section. Will be different. As shown in FIG. 7, at the portion where the concave portion forming convex portion 50a exists on the lower surface of the deformed fiber 2 (that is, the portion where the concave portion 3 is formed on the wiping sheet), the flat surface of the deformed fiber having a relatively large surface area. Is strongly pressed against one surface of the concave portion forming convex portion 50a by the water pressure of the high pressure water flow W. As a result, the deformed fibers existing in the recess 3 are oriented so that the major axis in the cross section thereof faces the direction along the surface of the wiping sheet (major axis orientation). On the other hand, as shown in the figure, in the portion where the concave portion 50b for forming the convex portion exists on the lower surface of the deformed fiber 2 (that is, the portion where the convex portion 4 is formed on the wiping sheet), the deformed fiber existing in the portion. Since the orientation in the cross section of the fiber can be changed, the orientation of the major axis in the cross section of the deformed fiber is oriented along the plane orthogonal to the plane of the wiping sheet (that is, so as to be less susceptible to the resistance force due to the high pressure water flow W). Minor axis orientation). In this way, the orientations of the deformed fibers in the cross section are different in the concave portion 3 and the convex portion 4.

In order to form a plurality of linear recesses 5 on the wiping sheet in addition to the uneven portions of the macroscopic pattern, for example, as shown in FIG. 5, between the uneven portion forming member 50 and the second support belt 42, for example. By arranging the linear recess forming member 60 having the structure as shown in FIGS. 8A and 8B, the linear recess 5 can be formed on one surface of the wiping sheet.

The linear recess forming member 60 shown in FIG. 8A is composed of a linear first linear member 60a and a spiral second linear member 60b. Water can flow in the area defined between the two linear members. Both linear members 60a and 60b are made of metal or synthetic resin.

The first linear member 60a has, for example, a circular or elliptical cross section thereof, and a plurality of the first linear members 60a are arranged at substantially equal intervals so as to be parallel to each other in a direction intersecting the MD direction. Further, it is preferable that the first linear member 60a is arranged so as to be located on the same plane. Then, one spiral second linear member 60b is wound around two adjacent linear linear members 60a. In the figure, the winding directions and pitches of the adjacent second linear members 60b are the same, but may be different. The second linear member 60b has a cross-sectional shape in which one or a plurality of linear members having a circular cross section having the same diameter are arranged in parallel. The second linear member 60b is wound so that the wire connecting the centers of the linear member 60b in its cross section is parallel to the first linear member 60a at any position of the second linear member 60b. It has been done. The cross section of the second linear member 60b may be circular or elliptical. The second linear member 60b may be wound so as to draw an ellipse as shown in FIG. 8B, or may be wound so as to draw a perfect circle or a triangle when viewed from the axial direction of the winding. good.

The distance Ap (pitch Ap; see FIG. 8 (a)) between the adjacent first linear members 60a in the linear recess forming member 60 is the length L1 in the linear recess 5 (see FIG. 4 (e)). It is determined and can be appropriately adjusted according to the desired length L1 of the linear recess 5, but is preferably 1 mm or more and 50 mm or less, and more preferably 3 mm or more and 20 mm or less. Further, the winding interval Bp (pitch Bp; see FIG. 8 (a)) between the second linear members 60b in the linear recess forming member 60 is the interval L2 (see FIG. 4 (e)) in the linear recess 5. It is determined and can be appropriately adjusted according to the desired spacing L2, but is preferably 0.1 mm or more and 30 mm or less, and more preferably 0.5 mm or more and 10 mm or less.

Similarly, the width Bd of the second linear member 60b (see FIG. 8B) determines the width W1 (see FIG. 4E) in the linear recess 5 and is the desired linear recess 5. Although it can be appropriately adjusted depending on the width W1, it is preferably 0.1 mm or more and 10 mm or less, and more preferably 0.5 mm or more and 5 mm or less. Further, the winding diameter Bh of the second linear member 60b determines the depth in the linear recess 5 in the sheet thickness direction, and can be appropriately adjusted in relation to the water pressure of the high-pressure water flow and the transport speed.

Returning to the method of forming the linear concave portion 5, the water flow sprayed from the second water flow nozzle 41 toward the upper surface side of the fiber aggregate 1A has its lower surface on the lower surface of the upper surface of the concave portion forming convex portion 50a in the concave-convex portion forming member 50. Press it so that it is in close contact with. At the same time, the deformed fiber 2 located in the convex portion forming concave portion 50b of the uneven portion forming member 50 is projected into the concave portion 50b. At the same time, the deformed fiber 2 protruding into the convex portion forming concave portion 50b is pressed against the second linear member 60b in the linear concave portion forming member 60 by a high-pressure water flow. The fiber aggregate 1A pressed against the second linear member 60b is depressed in the thickness direction of the aggregate 1A, and a plurality of linear recesses 5 complementary to the shape of the second linear member 60b are formed. To.

Since the width Bd of the second linear material 60b is narrower than the width of the concave portion forming convex portion 50a, the deformed fibers located on the second linear material 60b are the second linear material due to the high pressure water flow. As the fibers are pressed against the 60b, the fibers are further separated via the linear member 60b on the space 60R side defined between the adjacent second linear members 60b. Since the space 60R is configured to be smaller than the area of the convex portion forming concave portion 50b in the uneven portion forming member 50, the pressure of the high-pressure water flow passing through the space 60R is higher than the pressure of the sprayed water. Become. As a result, the deformed fibers existing in the space 60R are oriented so that the major axis in the cross section of the deformed fibers is oriented along the plane orthogonal to the plane of the wiping sheet so that the pressure (external force) due to the high pressure water flow W is less likely to be received. The ratio of is further higher than the ratio of the deformed fibers present in the convex portion 4 (that is, the ratio of the minor axis orientation is further higher). Further, by separating the deformed fibers via the second linear material 60b, the deformed fibers are oriented in the length direction along the extending direction of the second linear material 60b. That is, the deformed fibers 2 existing in the first region 7 located between the formed linear recesses 5 are oriented along the extending direction of the linear recesses 5. In this way, it is possible to form linear recesses while forming uneven portions of a macroscopic pattern having curved portions on one surface of the wiping sheet, and the deformed fibers existing in the adjacent linear recesses are the same. The orientation of the major axis in the cross section is different.

The fiber aggregate 1A manufactured as described above may be used as a dry wiping sheet as it is after being formed into a rectangular shape as shown in FIG. 2, for example, and a cleaning liquid may be applied to the fiber aggregate 1A in the wiping sheet 1. It can also be supported (supporting step) and used as a wet wiping sheet. In the step of supporting the cleaning liquid, the amount of the cleaning liquid supported on the fiber aggregate 1A is preferably 1 g / sheet or more when the dimensions of the wiping sheet 1 are 285 mm × 205 mm, for example, as described in Examples described later. 10 g / sheet or more is further preferable, 40 g / sheet or less is preferable, and 25 g / sheet or less is further preferable. In other words, 17 g / m ² or more is preferable, 117 g / m ² or more is more preferable, 690 g / m ² or less is preferable, and 430 g / m ² or less is further preferable.

The wiping sheet manufactured in this way can be attached to a cleaning tool such as a wiper or a building such as a floor or a wall surface, a cupboard, a window glass, a mirror, a door, a fitting such as a door knob, etc. It can also be used for rugs, carpets, furniture such as desks and dining tables, kitchens, toilets, body cleaning, hygiene products, packaging, etc.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above embodiment. For example, the uneven portion of the macroscopic pattern shown in FIG. 3 was formed on only one surface, but may be further formed on the other surface in addition to one surface. In this case, the uneven portion of the macroscopic pattern is formed on one surface of the fiber aggregate by the pattern forming step, the fiber aggregate is inverted, and the pattern forming step is further performed, so that the other surface is also macroscopic. The uneven portion of the pattern can be formed.

In order to form a fiber aggregate containing fibers other than the deformed fibers, for example, in the web forming unit 20, a second card machine is arranged, and the fiber web other than the deformed fibers is unwound from the card machine to form the deformed fibers. It may be laminated on the web. After that, by performing an entanglement step, a fiber aggregate containing fibers other than the deformed fibers can be formed in addition to the deformed fibers.

Further, as a method for manufacturing the wiping sheet, the entanglement step and the pattern forming step are performed in separate steps, but these may be performed in the same step. For example, in the entanglement step, a concavo-convex portion forming member 50 (more, if necessary, a linear concave portion forming member 60) is arranged between the web of the deformed fiber and the first support belt 32, and the fibers are entangled with each other. , The uneven portion or the linear concave portion of the macroscopic pattern may be formed.

Further, in the pattern forming step, the formation of the uneven portion of the macroscopic pattern and the formation of the linear concave portion are performed in the same step, but these formations may be performed in another step. For example, in the pattern forming step, only the uneven portion forming member 50 is arranged to form the uneven portion of the macroscopic pattern on one surface of the fiber aggregate, and then only the linear concave portion forming member 60 is arranged to flow water. By spraying, the linear recess 5 can be formed on the entire surface of the wiping sheet.

Further, the following wiping sheet is disclosed with respect to the above-described embodiment of the present invention.
<1>
A wiping sheet having a macroscopic pattern of uneven portions on at least one surface and having a fiber aggregate containing irregularly shaped fibers having a flat cross section.
In the concave and convex portions constituting the uneven portion, the deformed fiber existing in the concave portion has the major axis of the cross section substantially oriented in the direction along the surface of the wiping sheet, and the deformed shape existing in the convex portion. A wiping sheet in which the major axis of the cross section of the fiber is generally oriented in a direction along a plane orthogonal to the plane of the wiping sheet.

<2>
The wiping sheet according to <1>, wherein the deformed fiber has a major axis and a minor axis in its cross section.
<3>
When 10 or more deformed fibers are observed, 50% or more of the deformed fibers have an angle formed by the major axis of the deformed fiber and the surface of the wiping sheet of 45. When 10 or more deformed fibers are observed, 50% or more of the deformed fibers are the major axis of the deformed fiber and the wiping sheet. The wiping sheet according to <1> or <2>, wherein the angle formed with the surface is 45 degrees or more.
<4>
In addition to the uneven portion of the macroscopic pattern, a plurality of linear concave portions that are recessed from one surface of the wiping sheet toward the other surface and extend linearly are formed so as to face in one direction.
The deformed fiber existing in the first region located between two adjacent linear recesses in a direction orthogonal to the extending direction of the linear recess is a surface whose cross-sectional major axis is orthogonal to the surface of the wiping sheet. It is generally oriented along the direction of
The proportion of the deformed fiber in the first region in which the major axis of the cross section of the fiber is oriented in the direction along the plane orthogonal to the plane of the wiping sheet is such that the deformed fiber in the convex portion is the fiber. The wiping sheet according to any one of <1> to <3>, wherein the major axis of the cross section is higher than the ratio of orientation toward a plane orthogonal to the plane of the wiping sheet.

<5>
The wiping sheet according to <4>, wherein a plurality of directions in which the linear recesses extend are formed along the one direction.
<6>
When looking at a row of the linear recesses along the one direction, the adjacent linear recesses are line-symmetrical with the direction orthogonal to the one direction as the axis of symmetry. The wiping sheet according to <5>.
<7>
The above-mentioned <4>, wherein when looking at one row of the linear recesses along one direction, a plurality of linear recesses 5 are formed so as to extend in substantially the same direction. Wiping sheet.
<8>
The <4> to <7>, wherein the rows of two linear recesses 5 extending along the one direction and adjacent to each other in the direction orthogonal to the one direction are line-symmetrical with the one direction as the axis of symmetry. The wiping sheet described in any one of.
<9>
The deformed fiber existing in the first region has a direction in which the linear recess extends more than the deformed fiber existing in the second region located between two adjacent linear recesses in the extending direction of the linear recess. The wiping sheet according to any one of <1> to <8>, which is oriented along the above.
<10>
The wiping sheet according to any one of <1> to <9>, wherein the scrim net is arranged in the central region in the thickness direction of the fiber aggregate.
<11>
The wiping sheet according to any one of <1> to <10>, which is impregnated with a cleaning liquid.

<12>
The wiping sheet according to any one of <1> to <11>, wherein the deformed fiber is a fiber made of a thermoplastic resin.
<13>
The wiping sheet according to any one of <1> to <12>, wherein the fiber aggregate is mainly composed of the deformed fiber.
<14>
The wiping sheet according to any one of <1> to <13>, wherein the fiber aggregate contains 50% by mass or more of the deformed fibers.
<15>
The wiping sheet according to any one of <1> to <14>, wherein the fibers constituting the fiber aggregate are not fused to each other.
<16>
The wiping sheet according to any one of <1> to <15>, which is composed only of a fiber aggregate containing irregularly shaped fibers.
<17>
The wiping sheet according to any one of <1> to <16>, which is composed of a single-layer fiber aggregate.

<18>
The above <1> to <16, which are composed of a fiber aggregate having a multilayer structure including a layer containing the first deformed fiber and a layer containing the second deformed fiber different from the first deformed fiber. The wiping sheet described in any one of>.
<19>
The wiping sheet according to any one of <1> to <15>, which is composed of a fiber aggregate having a multilayer structure including a layer containing the deformed fibers and a layer not containing the deformed fibers.
<20>
The above-mentioned <1> to <19>, which is a multi-ply laminated structure in which a first fiber aggregate containing irregular fibers and a second fiber aggregate not containing irregular fibers are superposed. Wiping sheet.
<21>
The wiping sheet according to any one of <1> to <19>, which is a multi-ply laminated structure in which a fiber aggregate containing irregular fibers and a sheet material other than the fiber aggregate are laminated.
<22>
The proportion of the deformed fiber is preferably 50% by mass or more, more preferably 60% by mass or more, further preferably 70% by mass or more, any of the above <1> to <17>. The wiping sheet described in Kaichi.

<23>
The wiping sheet according to any one of <1> to <22>, which contains fibers having a perfect circular cross section.
<24>
The fiber having a perfect circular cross section is contained in a proportion of preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, according to the above <23>. Wiping sheet.
<25>
The deformed fiber has, in its cross-sectional shape, preferably at least one convex portion having a sharp top, more preferably two or more, still more preferably three or more, any of the above <1> to <24>. The wiping sheet described in Kaichi.
<26>
The wiping sheet according to <25>, wherein the deformed fiber has eight sharp tops.
<27>
When the contour line in the cross section of the deformed fiber is viewed along the circumferential direction, it has a shape having a plurality of convex portions and concave portions located between the adjacent convex portions, and the above <1> to <26. The wiping sheet described in any one of>.

Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the invention is not limited to such examples.

[Example 1]
As shown in FIG. 1 (b), a scrim net (made of PP, wire diameter of about 200 μm, tsubo) is subjected to water flow confounding using a deformed fiber having a multi-leaf shape in the cross section of the fiber made of a thermoplastic resin. A fiber aggregate having an amount of 5 g / m ² ) in the central region in the thickness direction was produced. The fiber composition of the fiber aggregate is as follows: deformed fiber (PET, fineness 1.7 dtex): round fiber (acrylic, fineness 1.0 dtex): flat fiber (rayon, fineness 1.7 dtex) = 70: 15 :. 15 was contained in a mass ratio, and the average fiber diameter thereof was about 12 μm. After molding the size of the fiber aggregate to 285 mm × 205 mm, it was impregnated with a cleaning liquid of 290 g / m ² to obtain a desired wet wiping sheet. The basis weight of the wiping sheet was 70 g / m ² .

[Comparative Example 1]
A fiber aggregate was produced by performing water flow entanglement using a fiber having a perfectly circular cross-sectional shape of the fiber made of a thermoplastic resin. The fiber composition of the fiber aggregate is as follows: round fiber (PET, fineness 1.45 dtex): round fiber (acrylic, fineness 1.0 dtex): flat fiber (rayon, fineness 1.7 dtex) = 70:15. : 15 was contained in a mass ratio, and the average fiber diameter thereof was about 11 μm. Other conditions were the same as in Example 1, and a wet wiping sheet was manufactured.

[Evaluation of hair collection]
In this evaluation, a flooring floor (DAG floor, manufactured by Kitakei Co., Ltd.) in which 20 10 cm hairs were sprayed per 1 tatami mat (1820 mm × 910 mm) was wiped for 6 tatami mats. As for the direction of the sheet at the time of wiping, the width direction Y in FIG. 2 was set to the same direction as the wiping direction. The number of hairs collected on the wiping sheet after wiping was measured to evaluate the hair collecting property. The results are shown in Table 1.

[Evaluation of fine particle collection]
In this evaluation, 7 types of test powder (particle size: 5 to 75 μm) specified in JIS Z 8901 were placed on a flooring floor (DAG floor, manufactured by Kitae Co., Ltd.) with a length (cleaning direction) of 90 cm and a width of 90 cm. Alternatively, 11 kinds of test powder (particle size: 1 to 8 μm) were sprayed in a range of 15 cm to 30 cm from the front in the wiping direction in an area of 15 cm in length × 90 cm in width in an area of 0.1 g. The wiping sheet of the example or the comparative example was wiped against this flooring by reciprocating twice in the wiping direction every 30 cm in width. This operation was performed for 6 sets. As for the direction of the sheet at the time of wiping, the width direction Y in FIG. 2 was set to the same direction as the wiping direction. The change in sheet mass before and after wiping was measured to evaluate the fine particle collection property. The results are shown in Table 1.

As shown in Table 1, the wiping sheet of the present invention contains irregularly shaped fibers as its constituent fibers, and thus has both a high collection property of fine particle stains and a high collection property of fiber stains such as hair. It turns out that there is. In particular, as can be seen from the evaluation of hair collecting property, it can be seen that the wiping sheet of Example 1 has high hair collecting property even when it is a wet wiping sheet.

1 Wiping sheet 1A Fiber aggregate 2 Deformed fiber 3 Recessed part 4 Convex part 5 Linear concave part 7 First area 8 Second area 10 Manufacturing equipment 20 Web forming part 30 Water flow entanglement part 40 Pattern forming part 50 Concavo-convex part forming member 60 Linear Recess forming member

Claims (6)

A wiping sheet having a macroscopic pattern of uneven portions on at least one surface and having a fiber aggregate containing irregularly shaped fibers having a flat cross section.
In the concave and convex portions constituting the uneven portion, the deformed fiber existing in the concave portion has the major axis of the cross section substantially oriented in the direction along the surface of the wiping sheet, and the deformed shape existing in the convex portion. A wiping sheet in which the major axis of the cross section of the fiber is generally oriented in a direction along a plane orthogonal to the plane of the wiping sheet. In addition to the uneven portion of the macroscopic pattern, a plurality of linear concave portions that are recessed from one surface of the wiping sheet toward the other surface and extend linearly are formed so as to face in one direction.
The deformed fiber existing in the first region located between two adjacent linear recesses in a direction orthogonal to the extending direction of the linear recess is a surface whose cross-sectional major axis is orthogonal to the surface of the wiping sheet. It is generally oriented along the direction of
The proportion of the deformed fiber in the first region in which the major axis of the cross section of the fiber is oriented in the direction along the plane orthogonal to the plane of the wiping sheet is such that the deformed fiber in the convex portion is the fiber. The wiping sheet according to claim 1, wherein the major axis of the cross section is higher than the ratio of orientation toward a plane orthogonal to the plane of the wiping sheet. The deformed fiber existing in the first region has a direction in which the linear recess extends more than the deformed fiber existing in the second region located between two adjacent linear recesses in the extending direction of the linear recess. The wiping sheet according to claim 2, which is oriented along the line. The wiping sheet according to any one of claims 1 to 3, wherein a scrim net is arranged in the central region in the thickness direction of the fiber aggregate. The wiping sheet according to any one of claims 1 to 4, which is impregnated with a cleaning liquid. The wiping sheet according to any one of claims 1 to 5, wherein the deformed fiber is a fiber made of a thermoplastic resin.

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