TW202000113A - Wiping sheet - Google Patents

Abstract

This wiping sheet (1) includes a fiber aggregate (1A) that has on at least one surface thereof an uneven section having a macroscopic pattern, and that contains irregular fibers having a flat shape in a transverse cross-section. In recesses (3) and protrusions (4) that constitute the uneven section, the transverse cross-section long diameter of irregular fibers (2) present in the recesses (3) is largely facing in a direction along the surface of the wiping sheet (1), and the transverse cross-section long diameter of irregular fibers (2) present in the protrusions (4) is largely facing in a direction along a surface which is orthogonal to the surface of the wiping sheet (1).

Description

Wipe sheet

The present invention relates to a wiping sheet.

Fibers made of thermoplastic resin are used for various purposes in the form of nonwoven fabrics obtained by interlacing the fibers. For example, Patent Document 1 discloses a nonwoven fabric containing 20 to 80% by mass of multi-leaf flat cross-section polyester fibers and 20 to 80% by mass of cellulose fibers. The non-woven fabric has high liquid-absorbing and liquid-retaining power and release property of liquids such as water or medicinal liquid, and has moderate bulkiness and softness. Therefore, it is described in this document that it can be used for wiping or beauty treatment for people.

Patent Document 2 discloses a wet cleaning sheet having a base material sheet and a cleaning solution obtained by winding a fiber assembly and a mesh sheet. This document describes that the wet cleaning sheet has a macroscopic concave-convex pattern formed on the cleaning surface, and has excellent hair capturing performance. [Prior Technical Literature] [Patent Literature]

[Patent Literature 1] International Publication No. 2014/132690 Specification [Patent Document 2] Japanese Patent Laid-Open No. 2017-113282

The present invention is a wiping sheet having a concave-convex portion having a macroscopic pattern on at least one side and a fiber assembly including irregular-shaped fibers having a flat cross section. In the concave portion and the convex portion constituting the concave-convex portion, the profiled fibers present in the concave portion are oriented such that the long diameter of the cross-section is approximately along the direction of the surface of the wiping sheet, and the profiled fibers present in the convex portion are transverse The long diameter of the cross-section is generally directed along the surface orthogonal to the surface of the wiping sheet.

The non-woven fabric of Patent Document 1 is for the purpose of wiping a person or being used for beauty, and there is no disclosure about the collectability of garbage when cleaning the ground or the like. In addition, the cleaning sheet of Patent Document 2 has room for improvement in the collection performance of fine particles (dust) dirt.

Therefore, the present invention relates to a wiping sheet that solves the disadvantages of the prior art.

Hereinafter, the wiping sheet of the present invention will be described based on its preferred embodiments. In the present invention, "wiping" means both cleaning and wiping, for example, cleaning of buildings including floors, walls, ceilings and columns, cleaning of construction equipment or spare parts, wiping of articles, body and body Wipe of related appliances, etc.

The wiping sheet of the present invention contains shaped fibers, and it is preferable to include a fiber assembly mainly composed of shaped fibers. Profiled fibers are fibers that are stacked, entangled, or combined with each other to form a fiber assembly. The fibers constituting the fiber assembly can be fused or not fused with each other. From the viewpoint of increasing the degree of freedom of the fibers and improving the collection efficiency of the dirt, the fibers constituting the fiber assembly are preferably such that the fibers do not fuse with each other. "As the main body" means that the fiber aggregate constituting the wiping sheet contains 50% by mass or more of irregular-shaped fibers.

When focusing on one fiber aggregate, the wiping sheet of the present invention may include a single-layer fiber aggregate containing profiled fibers, or may include a multi-layer structure fiber aggregate, the multi-layer structure fiber aggregate having a profile A layer of fibers, and a layer not containing shaped fibers. In addition, the wiping sheet of the present invention may also include a fiber assembly of a multilayer structure having a layer containing a first shaped fiber and a second shaped fiber different from the first shaped fiber Floor.

The wiping sheet of the present invention may be composed of only one fiber aggregate (irrespective of single layer or multiple layers) containing profiled fibers, or may have a multi-layer laminate structure in which the first fiber aggregate including profiled fibers overlaps It is obtained by the second fiber aggregate or other sheet material except for the fiber aggregate and the second fiber aggregate that does not contain shaped fibers. Examples of the fiber assembly include non-woven fabric, woven fabric, and paper.

In the case where the wiping sheet of the present invention accounts for the ratio of irregularly shaped fibers when the wiping sheet contains a fiber assembly of a single-layer structure, it takes into account both the trapping properties of particulate dirt and the trapping properties of fiber dirt such as hair In particular, it is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass or more. The fibers that can be contained in the wiping sheet of the present invention in addition to shaped fibers are fibers whose cross section is a true circle (in this specification, fibers with a true cross section are also referred to as "non-shaped fibers"). When such a non-shaped fiber includes a fiber aggregate of a single-layer structure in the wiping sheet, it is preferably contained at a ratio of at most 50% by mass, and more preferably at a ratio of at most 40% by mass. It is preferably contained in a ratio of 30% by mass or less.

The shaped fiber contained in the wiping sheet of the present invention refers to a fiber having a flat cross-sectional shape (a cross-section orthogonal to the longitudinal direction of the fiber). The cross-section of the fiber is flat means that the cross-section of the fiber is the longest of the line segments that cross the cross-section and the length of the longest line segment is A, which is orthogonal to the line segment and the longest among the line segments that cross the cross-section When the length of the line segment is set to B, the length A is longer than the length B. That is, the profiled fibers are those having a long diameter and a short diameter in its cross section. The profiled fiber is preferably symmetrical with the line segment of length A as the line of symmetry.

Examples of the profiled fiber having such a cross-sectional shape of the fiber include those having an oval shape shown in FIG. 1(a) and a multi-lobed shape shown in FIG. 1(b). In the profiled fiber whose cross-sectional shape of the fiber shown in FIG. 1(a) is ellipse, the length A is the long diameter of the ellipse, and the length B is the short diameter of the ellipse (hereinafter, in this specification, regardless of the cross-section of the profiled fiber Regardless of the shape, the length A is also called "long diameter", and the length B is also called "short diameter"). By having such a cross-section, the shaped fiber can make the flexural rigidity of the fiber anisotropic, and as a result, fiber dirt such as hair can be easily entangled.

In detail, the flexural rigidity of the profiled fiber in the cross-sectional direction along the major axis (hereinafter, also referred to as the major axis direction) and along the minor axis (hereinafter, referred to as the minor axis direction) (EI) makes a difference. The flexural rigidity (EI) is expressed by the product of the Young's modulus (E) of the constituent material and the second moment (I) of the cross-section determined by the cross-sectional shape and size of the fiber. The profiled fiber contains the same material, and the Young's modulus is constant. Therefore, the flexural rigidity of the profiled fiber is determined by the magnitude of the second moment of the cross section of the profiled fiber. The second moment of the cross section of the profiled fiber becomes larger in the long-diameter direction of the cross-section and becomes smaller in the short-diameter direction. Therefore, the profiled fiber abuts on the surface to be cleaned so that the angle of the long-diameter direction of its cross-section and the surface to be cleaned is substantially right-angled, thereby exhibiting high flexural rigidity. This makes it possible to scrape and hook the fiber dirt existing on the surface to be cleaned. In addition, the shaped fiber abuts on the surface to be cleaned so that the angle between the short-diameter direction of the cross-section and the surface to be cleaned is substantially right-angled, whereby the flexural rigidity is lower than the contact with the long-diameter direction. As a result, fiber dirt can be entangled. In this way, the wiping sheet can effectively improve the collection performance of the fiber dirt by including the shaped fiber.

As described above, the profiled fiber contained in the wiping sheet is the relationship between the long diameter of the cross section and the angle formed by the surface of the wiping sheet from the viewpoint of the collection performance of the fiber dirt. When focusing on the alignment of the cross-section of profiled fibers (hereinafter, this alignment is also referred to as "fiber cross-section alignment"), the profiled fibers whose angle between the long diameter of the cross-section and the surface of the wiping sheet does not reach 45 degrees The existence ratio of 50% or more on the basis of the number of roots is defined as "the long diameter of the cross-section is approximately in the direction along the surface of the wiping sheet", and the angle formed by the long diameter of the cross-section and the surface of the wiping sheet The existence ratio of the irregular-shaped fibers of 45 degrees or more is 50% or more in terms of the number ratio, and is defined as "the long diameter of the cross-section is generally directed in a direction orthogonal to the surface of the wiping sheet."

In addition to the effective collection of fiber dirt such as hair, from the viewpoint of achieving effective collection of particulate dirt, the profiled fiber used in the present invention preferably has at least one convex portion in its cross-sectional shape, and is more preferably In order to have 2 or more, more preferably 3 or more, the convex portion has a sharp top. As the sharp top, the profile of the convex portion of the cross-sectional shape of the profiled fiber can be exemplified by (A) the case where it is divided and formed by the intersection of two straight lines that are not parallel, (B) the intersection of a straight line and a curve The division is formed, and (C) the division is formed by the intersection of two curves. For example, the profiled fiber shown in FIG. 1(b) has 8 sharp tops. The sharp apex preferably extends in a direction crossing the long axis, and preferably extends in a direction orthogonal to the long axis. In the present invention, one kind of shaped fiber may be used alone, or two or more kinds of shaped fibers with different cross-sectional shapes may be used in combination. As other special-shaped fibers with sharp tops, subject to the ratio of the long and short diameters described later, the cross-sectional shape can be, for example, triangular, quadrilateral, pentagonal, and hexagonal convex polygons, star polygons, W-shaped and so on.

In particular, when one kind of profiled fiber is used alone, in addition to the collecting ability of fiber dirt such as hair, from the viewpoint of increasing the specific surface area of the constituting fiber and improving the collecting ability of fine particles, as shown in FIG. 1( As shown in b), when the outline of the cross-section of the profiled fiber is viewed in the circumferential direction, it is preferable to have a shape having a plurality of convex portions P and concave portions R located between adjacent convex portions P.

As shown in FIG. 2, the wiping sheet of the present invention including a fiber assembly containing the above-mentioned shaped fibers is a substantially rectangular sheet having a longitudinal direction X and a width direction Y perpendicular to the direction. As shown in the figure, the wiping sheet 1 has concave-convex portions with a macro pattern on at least one surface thereof, and the concave-convex portions have curved portions. From the viewpoint of effectively collecting fiber dirt and fine particle dirt such as hair, it is more preferable that the surface side used as the wiping surface (the surface in contact with the wiping object surface) has a concave-convex portion with a macroscopic pattern, and the concave-convex portion has a curved portion.

As shown in this figure, the concave portion 3 and the convex portion 4 that constitute the concave-convex portion are formed on one surface of the wiping sheet 1. The boundary between the concave portion 3 and the convex portion 4 has a curved portion in a macroscopic view. When the irregularities of the macro pattern are formed on one surface, the other surface is flat, and the irregularities from the irregularities of the macro pattern are not formed.

The concave-convex portion of the macro pattern is not limited to the macro pattern shown in the figure, for example, it can be obtained by appropriately combining the macro pattern shown in Japanese Patent Laid-Open No. 2017-113282, or a straight line, curve, circle, polygon, etc. Macro pattern. Furthermore, the curve shape on the macro means that except for the curve constituting the micro-scale fine holes and the curve constituting the drainage holes with a diameter of about 1.5 to 2 mm, a part of the side of the figure which constitutes the concave-convex portion can be visually confirmed as From this viewpoint, it is preferable to form the concave portion 3 and the convex portion 4 so that the area of each convex portion 4 surrounded by the concave portion 3 is 300 mm ² or more. By having the concave-convex portion of such a macro pattern, the advantage of improving the designability of the wiping sheet itself can also be achieved.

The wiping sheet of the present invention has a flat shape with a long diameter and a short diameter in the cross section of the profiled fiber as its constituent fiber, and the fiber alignment is different in the concave portion 3 and the convex portion 4 constituting the concave-convex portion of the macro pattern. Specifically, the profiled fibers present in the concave portion 3 are oriented such that the flat surface faces the surface of the wiping sheet (paper surface direction in FIG. 2), and the profiled fibers present in the convex portion 4 face the surface of the wiping sheet with their flat surface Align the planes that are orthogonal to the plane (the plane that is orthogonal to the paper plane in Figure 2).

In other words, the profiled fibers present in the concave portion 3 have their cross-sectional major axis oriented generally along the direction of the wiping sheet surface, and the profiled fibers present in the convex portion 4 have their cross-sectional minor axis oriented substantially along the wiping sheet material Direction. In this way, by arranging a plurality of areas with different orientations of the flat surface of the profiled fibers on the wiping surface of the wiping sheet, the present invention can take into account the trapping ability of the particulate dirt due to the higher degree of freedom of the fiber, and Collectability of fiber dirt such as hair from the rigidity of the fiber.

"The long diameter of the cross-section of the profiled fiber generally faces the direction along the surface of the wiping sheet" refers to the profiled fiber that is more than 50% (based on the number of fibers) of the profiled fiber when 10 or more profiled fibers are the object of observation The angle formed by the long diameter and the surface of the wiping sheet does not reach 45 degrees (hereinafter, it is also referred to as "long diameter alignment"). In addition, "the long diameter of the cross-section of the profiled fiber generally faces the direction orthogonal to the surface of the wiping sheet" means that when 10 or more profiled fibers are the object of observation, 50% of the profiled fibers (number Standard) The angle between the long diameter of the above-mentioned shaped fiber and the surface of the wiping sheet is 45 degrees or more (hereinafter, it is also referred to as "short-axis alignment").

From the viewpoint of improving the trapping property of fine particle dirt, in the profiled fibers existing in the concave portion of the macro pattern, the ratio of the long diameter of the cross section to the direction along the direction of the surface of the wiping sheet is the number of profiled fibers On a standard basis, it is preferably 50% or more, more preferably 60% or more, and further preferably 100% or less, and still more preferably 80% or less, specifically, 50% or more and 100% or less, Furthermore, it is preferably 60% or more and 80% or less.

From the viewpoint of improving the trapping ability of fiber dirt such as hair, in the irregular-shaped fibers existing in the convex portions in the macro pattern, the long diameter of the cross section is oriented along the direction orthogonal to the surface of the wiping sheet The ratio is preferably 50% or more, more preferably 60% or more, and more preferably 100% or less, further preferably 80% or less based on the number of shaped fibers, and specifically, it is preferably 50% or more and 100% or less, and more preferably 60% or more and 80% or less. The alignment ratio can be calculated by observation using a scanning electron microscope (SEM) and based on the number of shaped fibers satisfying the above-mentioned alignment criteria.

The alignment of the cross-section of the profiled fibers (fibre cross-section alignment) can be used to measure the fibers of the profiled fibers observed on the measurement target surface of the wipe sheet after measuring the long and short diameters of the profiled fibers constituting the fiber assembly The diameter is measured and calculated. These long diameter, short diameter, and fiber diameter can be observed by a scanning electron microscope (SEM), and can be measured by, for example, the following method.

Figures 3(a) and (b) show the use of a scanning electron microscope for the wiping sheet when using shaped fibers (long diameter 20.0 μm, short diameter 9.0 μm) having the cross-sectional shape shown in Figure 1(b) (SEM) Observe the image of the wiped surface. When the fiber width (length 20.0 μm×cos45°=14.1 μm) observed when the angle formed by the long diameter of the profiled fiber and the surface of the wiping sheet is 45 degrees, it exists in the macro The irregular-shaped fibers in the concave portion 3 of the concave-convex portion of the pattern exceed 60% of the basis of the fiber cross-sectional alignment on the basis of the number of fibers, and the number of fibers with long-diameter alignment increases (see FIG. 3(a)). On the other hand, the irregularly shaped fibers 2 of the convex portions 4 existing in the concave and convex portions of the macro pattern are more than 70% based on the number basis, which is lower than the basis of the fiber cross-section alignment, and there are more fibers with short-diameter alignment (refer to FIG. 3 (b)).

From the viewpoint that the trapping property of fine particle dirt and the trapping property of fibrous dirt such as hair on the surface of a wet cleaning object are excellent, the wiping sheet of the present invention is preferably in addition to the unevenness of the macro pattern shown in FIG. 2 In addition to the portion, a linear recess 5 that is recessed from one side of the wiping sheet 1 to the other surface is also formed. The linear recess 5 extends linearly, and a plurality of concave portions 5 are formed so as to face one direction. In this figure and FIG. 4(a), a plurality of linear recesses 5 are formed along the longitudinal direction X of the wiping sheet 1 in the direction in which it extends, as a "one direction" as a reference direction (for example, the 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, and further preferably less than 20 degrees, so that the effect of the present invention can be achieved.

As the formation state of the linear recess 5 other than that shown in FIGS. 2 and 4(a), as shown in FIG. 4, for example, the following state can be cited, that is, the direction along the observation direction as a reference (in FIG. 4 When the length of one linear concave portion 5 in the longitudinal direction X) is 5L, (i) the adjacent linear concave portion 5 takes the direction orthogonal to the reference direction (the width direction Y in the figure) as the axis of symmetry 5S. Symmetry (refer to FIGS. 4(a), (b), and (c)), (ii) pluralities are formed so that the directions in which the linear recesses 5 extend are substantially the same direction (refer to FIG. 4(d)), In addition, (iii) two linear recesses 5 extending in the reference direction (for example, the longitudinal direction X in the figure) and adjacent to the direction orthogonal to the reference direction (the width direction Y in the figure) The lines 5L and 5L are line-symmetrical with the direction (longitudinal direction X) as the reference being the axis of symmetry 5A (see FIG. 4(c)). These aspects can be combined as long as the effects of the present invention can be achieved.

In the wiping sheet 1 shown in FIG. 2, a plurality of linear recesses 5 are arranged in series at intervals in the direction in which they extend (the longitudinal direction X in the figure) to form a row of linear recesses 5. The rows of the linear recesses 5 are arranged 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. In addition, the distance between the rows of the linear recesses 5 may be the same or may be different. FIG. 2 shows a state in which the rows of the plurality of linear recesses 5 having the same length and the plurality of linear recesses 5 are arranged at substantially equal intervals, and adjacent lines in a direction orthogonal to the direction in which the linear recesses 5 extend The positions of the two ends of the shaped concave portion 5 coincide 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 side of the sheet. In addition, when the linear concave portion 5 is formed on the surface of the wiping sheet on the side of the concave-convex portion having a macro pattern, it can be formed on the entire surface of the sheet, or it can be formed only on the concave portion 3 of the macro pattern of the sheet. It may be formed only on the convex portion 4 of the macro pattern of the sheet. When the linear concave portion 5 is formed on one surface of the wiping sheet, the linear convex portion complementary to the linear concave portion 5 may be formed on the other surface of the wiping sheet, or may be flat without forming the linear convex portion.

In addition to the trapping properties of fibrous dirt such as hair, and from the viewpoint of making the trapping properties of fine particle dirt excellent, the linear recesses 5 are preferably recessed toward the other side from the surface side of the recesses and projections on which the macro pattern is formed By way of formation, the linear recesses are preferably formed only on the convex portions of the macro pattern of the wiping sheet.

The wiping sheet forming the linear concave portion 5 has different alignment directions of the cross-sections of the profiled fibers existing around the linear concave portion 5, which can take into account both the trapping ability of fine particle dirt and the trapping property of fiber dirt such as hair, and is superior . In particular, when the wiping sheet of the present invention is used on a wet cleaning target surface such as a dressing room, a bathroom, a kitchen, and the like near a bathroom, the collection ability of fiber dirt such as hair is further improved. As shown in FIG. 4(e), in the linear recess 5, the area between the two linear recesses 5, 5 adjacent in the direction orthogonal to the direction in which the linear recess 5 extends is defined as In the first region 7, the profiled fibers existing in the first region 7 are oriented such that the long diameter of the cross-section of the fiber is along the direction orthogonal to the surface of the wiping sheet. That is, the irregular fibers present in the first region 7 are aligned in the short diameter.

The profiled fibers present in the first region 7 have the above-mentioned cross-sectional alignment, and the longest diameter of the cross-section of the fibers of the profiled fibers in the first region 7 is along the plane orthogonal to the surface of the wiping sheet 1 The ratio of the direction alignment is higher than the ratio of the long axis of the cross-section of the profiled fibers of the convex portion 4 present in the macro pattern to the direction orthogonal to the plane orthogonal to the plane of the wiping sheet 1. That is, the ratio of the short-axis alignment of the irregular fibers present in the first region 7 is higher than that of the irregular fibers present in the convex portion 4 in the macro pattern.

In detail, the ratio of the longitudinal direction of the cross-section of the profiled fiber present in the first region 7 to the direction orthogonal to the plane of the wiping sheet 1 is based on the number of profiled fibers, compared It is preferably 50% or more, more preferably 60% or more, and further preferably 100% or less, further preferably 80% or less, and specifically, preferably 50% or more and 100% or less, still more preferably Above 60% and below 80%. These alignment ratios can be calculated by observing the aforementioned SEM (scanning electron microscope).

The length L1 of the linear recess 5 (refer to FIG. 4(e)) is preferably 1 mm or more when the size of the wiping sheet is set to a substantially rectangular shape of 285 mm×205 mm as described in the embodiment, and more preferably 3 mm or more, and preferably 50 mm or less, and more preferably 20 mm or less. Similarly, the width W1 of the linear recess 5 (see FIG. 4(e)) is preferably 0.1 mm or more, more preferably 0.5 mm or more, and further preferably 10 mm or less, and further preferably 5 mm or less. Also, similarly, the depth of the linear recess 5 in the thickness direction of the sheet is preferably 0.01 mm or more, more preferably 0.1 mm or more, and further preferably 5 mm or less, further preferably 2 mm or less.

The interval L2 between two linear recesses 5, 5 adjacent to the direction orthogonal to the direction in which the linear recess 5 extends (refer to FIG. 4(e)). The dimensions of the wiping sheet are as described in the embodiment When it is set to a substantially rectangular shape of 285 mm×205 mm, it is preferably 0.1 mm or more, more preferably 0.5 mm or more, and further preferably 30 mm or less, and further preferably 10 mm or less. Similarly, the interval L3 (see FIG. 4(e)) between two adjacent linear recesses 5, 5 in the direction in which the linear recess 5 extends is preferably 0.1 mm or more, and more preferably 0.5 mm or more, and , Preferably 30 mm or less, and more preferably 10 mm or less.

Focusing on the direction in which the shaped fibers constituting the wiping sheet 1 extend, as shown in FIG. 4(e), the area between two adjacent linear recesses in the direction in which the linear recess 5 extends When the second region 8 is used, the profiled fibers present in the first region 7 are preferably aligned in the direction in which the fiber-shaped fibers present in the second region 8 extend in the direction in which the linear recess 5 extends. In this figure, the ratio of the irregular fibers present in the first region 7 along the direction in which the linear recess 5 extends, that is, the longitudinal direction X, is higher than the irregular fibers present in the second region 8. When the shaped fibers are aligned in this way, when the wiping sheet of the present invention is moved in the direction of the width direction Y for wiping, the contact area between the fiber surface of the shaped fibers and the surface of the object to be wiped becomes larger, so it can be more easily entangled in the object to be wiped The fine particle dirt and fibrous dirt such as hair on the surface, as a result, the catchability of the fine dirt and fibrous dirt such as hair is higher.

The ratio of the fiber length direction of the profiled fibers existing in the first region 7 along the direction in which the linear recesses 5 extend is based on the number of profiled fibers, preferably 50% or more, and more preferably 60% or more, and, It is preferably 100% or less, further preferably 90% or less, specifically, 50% or more and 100% or less, and more preferably 60% or more and 90% or less.

The ratio of the fiber longitudinal direction of the profiled fibers present in the second region 8 along the direction in which the linear recess 5 extends is the ratio of the profile fibers present in the first region 7 and the second region 8 along the direction of the linear recess 5 Satisfying the above relationship as a condition, based on the number of shaped fibers, it is preferably 0% or more, more preferably 10% or more, and further preferably 50% or less, further preferably 40% or less, specifically It is preferably 0% or more and 50% or less, and more preferably 10% or more and 40% or less. The ratio of the alignment of the profiled fibers along the direction in which the linear recess 5 extends can be observed by, for example, the target part of the sample whose direction is clear by SEM, and the root of the fiber whose angle between the direction in which the linear recess 5 extends and the fiber is 45 degrees or more The number is measured.

The profiled fiber is preferably made of 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 poly Acrylic resins such as acrylic acid and polymethyl methacrylate, and fluororesins such as polyperfluoroethylene may be used alone or in combination of two or more.

The fineness of the profiled fibers contained in the wiping sheet is preferably 0.5 dtex or more, more preferably 1 dtex or more, and further preferably 1.2 dtex or more from the viewpoint of operability and dirt collection efficiency during wiping. The upper limit is preferably 4 dtex or less, more preferably 3.5 dtex or less, and further preferably 3 dtex or less.

The fiber length of the profiled fiber depends on the manufacturing method of the fiber. Generally speaking, it is 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 is preferably 1.2 or more, more preferably 1.5 or more, and still more preferably 2 or more, and the upper limit is preferably 5 or less, more preferably 4 or less, Furthermore, it is preferably 3 or less. Specifically, the value of A/B is preferably 1.2 or more and 5 or less, more preferably 1.5 or more and 4 or less, and still more preferably 2 or more and 3 or less. With such a configuration, the fibers constituting the wiping sheet are likely to be entangled with fiber dirt such as hair, and the dirt hook can be taken from the fiber and removed from the surface to be wiped.

From the viewpoint of having both the operability at the time of wiping and the dirt collecting property, the length A satisfies the above range of A/B, preferably 1 μm or more, more preferably 5 μm or more, and even more preferably It is 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 satisfies the above-mentioned range of A/B, preferably 0.2 μm or more, more preferably 1 μm or more, and further preferably 2 μm or more, and the upper limit is preferably 40 μm or less, preferably 20 μm or less, preferably 15 μm or less.

As shown in FIG. 1(b), when the outline of the cross-section of the profiled fiber is viewed in the circumferential direction, it is the case that it has a plurality of convex portions P and a concave portion R located between adjacent convex portions P, Set the length of the line segment connecting the vertices of the adjacent convex portions P to C, and set the length of the vertical line from the line segment to the bottommost position of the concave portion R to D (refer to FIG. 1(b)). The value of C/D is preferably 0.1 or more, more preferably 1 or more, and still more preferably 2 or more, and the upper limit is preferably 5 or less, more preferably 4 or less, and still more preferably 3 or less. With such a configuration, the surface area of a single fiber increases, and the contact area with dirt increases, so the dirt trapping ability can be further improved.

When observing the cross section of the profiled fiber, when the length C of the line segment connecting the vertices of the adjacent adjacent convex portions P is different, the value of C used to calculate the value of C/D is set to all C The average value. Similarly, when the length of the vertical line of the arbitrarily selected recess R, that is, D is different, the value of D used to calculate the value of C/D is set as the average value of all values of D. In the following description, when referring to the value of C and D, the value refers to the average value of C and D.

From the viewpoint of improving the operability during wiping and the collection efficiency of dirt, the length C satisfies the above-mentioned range of C/D, preferably 0.1 μm or more, more preferably 0.5 μm or more, and further 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 satisfies the above-mentioned range of C/D, preferably 0.1 μm or more, more preferably 0.5 μm or more, and further preferably 1 μm or more, and the upper limit is preferably 20 μm or less, preferably 10 μm or less, preferably 5 μm or less.

The above-mentioned lengths A to D can be measured by the following measuring method. That is, after using a razor to maintain the cross-sectional shape of the fiber, the produced fiber assembly is cut, and then the cross-section is vacuum vapor-deposited by Pt. Use a scanning electron microscope (manufactured by JEOL Ltd., JSM-IT100) to observe the cross section of the fiber assembly deposited by Pt at a magnification of 500 to 1000 times, and use the length measurement tool of the attached software to measure the above length A to D.

In the case where the wiping sheet of the present invention contains fibers with a round cross-section (non-shaped), the fineness of the fibers is preferably 0.6 dtex from the viewpoint of operability during wiping and dirt collection efficiency The above, and further preferably 1.0 dtex or more, more preferably 1.2 dtex or more. Furthermore, it is preferably 4.0 dtex or less, further preferably 3.5 dtex or less, and more preferably 3.0 dtex or less.

The wiping sheet of the present invention may be composed of only shaped fibers, or may further contain other fibers. For other fibers, for example, natural fibers such as wood pulp, cotton, and silk, regenerated fibers such as rayon and cuprammonium fibers, hydrophilic fibers such as refined fibers such as lyocell, or the above-mentioned thermoplastic resins can be used as raw materials. These raw materials can be used alone or in combination of two or more. The cross section of other fibers can be true round (non-shaped) or flat (shaped). When the wiping sheet contains a fiber aggregate of a single-layer structure, the other fibers are preferably contained at a ratio of 50% by mass or less, more preferably at a ratio of 40% by mass or less, and more preferably at 30% by mass Contains at a rate below %.

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

Also, from the same point of view, the thickness of the wiping sheet is preferably 0.5 mm or more under a 40 N/m ² load, and further preferably 1.0 mm or more, and it is preferably limited to 2.5 mm under the load Below, further preferably 3 mm or less.

The wiping sheet can be used directly with the fiber assembly (so-called dry type) during wiping, or it can be coated, sprayed, loaded or impregnated with the cleaning solution (so-called wet type) use. These aspects 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 improving the cleaning efficiency of the surface to be wiped, it is preferable that the cleaning solution is supported on the fiber assembly constituting the wiping sheet. Since the fiber assembly contains shaped fibers, the gap between the fibers can be increased, and as a result, the advantage of improving the liquid retention of the cleaning solution in the wiping sheet can also be achieved. In particular, even when the wiping sheet is used in a wet state on a wet cleaning target surface such as a dressing room, toilet, kitchen, etc. near the bathroom, the wiping sheet of the present invention can be more easily entangled with hair, etc. Fiber dirt.

In the case of wiping, when the wiping sheet is used in a wet state, as the cleaning liquid carried on the sheet, a separate wiping solution, an aqueous solution containing additives, etc., used for the wet wiping sheet The general composition. Examples of additives used in the cleaning liquid include surfactants, bactericides, fragrances, fragrances, deodorants, pH adjusters, alcohols, and abrasive particles.

From the viewpoint of giving the wiping sheet sufficient strength in practical use, the wiping sheet of the present invention preferably further includes a scrim that supports the fiber assembly constituting the sheet. In addition, from the same viewpoint, it is also preferable that the scrim is disposed in the central region in the thickness direction of the fiber assembly. The scrim can be entangled with the irregularly shaped fibers constituting the fiber assembly, and examples include net-like, lattice-like, and rope-like forms.

As the raw material constituting the scrim, a resin can be used. As the resin, for example, polyolefin resin such as polyethylene or polypropylene, polyester resin such as polyethylene terephthalate, polyamide resin such as nylon 6 or nylon 66, acrylonitrile resin such as polyacrylonitrile, Vinyl resins such as polyvinyl chloride and polystyrene, vinylidene resins such as polyvinylidene chloride, and the like.

From the viewpoint of taking into consideration the entanglement of profiled fibers and scrim, and the strength of the wiping sheet, the wire diameter (diameter of cross section) of the scrim can be adjusted appropriately according to the degree of fiber entanglement, preferably 10 μm or more It is further preferably 500 μm or more, preferably 2000 μm or less, and further preferably 1000 μm or less. The wire diameter of the scrim yarn may be partially different or the same. When the wire diameter is partially different, the wire diameter of the scrim yarn is set as its average value. In addition, the basis weight of the scrim is preferably 1 g/m ² or more, more preferably 3 g/m ² or more, preferably 20 g/m ² or less, and more preferably 10 g/m ² or less.

The above is a description of one embodiment of the wiping sheet of the present invention. Hereinafter, a preferred manufacturing method of the wiping sheet will be described with reference to FIG. 5. FIG. 5 shows a manufacturing apparatus 10 that can be preferably used for manufacturing a wiping sheet. The manufacturing apparatus 10 includes a web forming portion 20, a spunlace portion 30, and a pattern forming portion 40 in this order in the conveying direction (MD direction). This manufacturing method is roughly divided into two steps of forming a fiber assembly including shaped fibers by spunlacing and forming a concave-convex portion of a macroscopic pattern on one surface of the fiber assembly. In addition, in the following description, the conveyance direction (MD direction) coincides with the longitudinal direction X, and the direction orthogonal to the conveyance direction coincides with the width direction Y.

First, the web of the shaped fiber 2 is unwound from the card 21 of the web forming portion 20 via the guide roller 22. When it is assumed that the scrubbing sheet has the scrim, the scrim 15 and the cotton web of the profiled fiber 2 are unwound from the scrim roller 25. Through the unwinding, the cotton webs and scrims of profiled fibers are stacked.

Next, in the spunlace portion 30, the cotton web of the profiled fiber 2 (or the laminate of the web of the profiled fiber 2 and the scrim 15) is transported in the MD direction by the first support tape 32 permeable to water. The high-pressure water flow ejected from the first water flow nozzle 31 is subjected to cross-over processing (cross-over step). By going through this step, the shaped fibers 2 are entangled with each other to form a fiber assembly 1A containing shaped fibers. In the case of a state with a scrim yarn, by this step, the profiled fibers 2 are intertwined with each other, and the profiled fibers 2 and the scrim yarn 15 are in a state of being entangled together, forming a profiled fiber with scrim Fiber assembly 1A. In this step, the water pressure sprayed from the first water flow nozzle 31 may be preferably 30 kg/cm ² or more and 80 kg/cm ² or less, and more preferably 40 kg/cm ² or more and 60 kg. /cm ² or less, and the transport speed of the MD of the profiled fiber 2 in the MD direction is preferably 2 m/min or more and 10 m/min or less, and more preferably 4 m/min or more and 8 m/min It will be manufactured as follows.

Then, in the pattern forming section 40, a high-pressure water flow is sprayed onto the fiber assembly 1A containing the irregular-shaped fibers to form a concave-convex portion of a macro pattern on one surface of the fiber assembly (pattern forming step). The water pressure sprayed from the second water flow nozzle 41 and the transfer speed of the fiber assembly can be set to the same range as the crossover step.

In this step, as shown in FIG. 5, a high-pressure water flow is sprayed from the second water flow nozzle 41 to one surface of the fiber assembly 1A transported from the spunlace portion 30. At this time, a concave-convex portion forming member 50 having a structure as shown in FIG. 6, for example, is arranged between the fiber assembly 1A and the second support belt 42, whereby the high-pressure water flow can be sprayed to the fiber assembly 1A The surface on the opposite side of the surface forms the concave portion 3 and the convex portion 4 that are complementary to the concave and convex shape of the concave-convex portion forming member 50. The uneven portion forming member 50 contains metal and synthetic resin.

In detail, the water jet sprayed from the second water flow nozzle 41 toward the upper surface side of the fiber assembly 1A presses its lower surface so as to be in close contact with the upper surface of the concave portion forming convex portion 50a in the concave and convex portion forming member 50 . In addition, the irregular fibers 2 constituting the fiber assembly 1A of the fiber assembly 1A located in the convex portion forming concave portion 50b of the uneven portion forming member 50 protrudes from the concave portion 50b, and the concave portion forming convex portion located in the concave and convex portion forming member 50 The 50a shaped fiber 2 is sunk in the thickness direction of the aggregate. The water sprayed in the spunlace passes through a plurality of drain holes 50c provided in the concave portion 50b for convex portions and the convex portion 50a for concave portions provided in the concave-convex portion forming member 50. In this way, irregularities having a macroscopic pattern of curved portions can be formed on one surface of the wiping sheet.

Since the wiping sheet of the present invention includes profiled fibers having a flat cross section as its constituent fibers, the alignment of the cross sections of the profiled fibers of the concave portion 3 and the convex portion 4 formed in the pattern forming step are different. As shown in FIG. 7, the convex portion 50a for forming the concave portion exists on the lower surface of the shaped fiber 2 (that is, the portion where the concave portion 3 is formed on the wiping sheet), and the flat surface of the shaped fiber with a relatively large surface area is subjected to high-pressure water flow The water pressure of W tightly presses against one surface of the convex portion 50a for forming a concave portion. As a result, the major axis of the cross-section of the profiled fibers present in the recess 3 is the alignment (long axis alignment) in the direction along the surface of the wiping sheet. On the other hand, as shown in the figure, the concave portion 50b for forming the convex portion exists on the lower surface of the shaped fiber 2 (that is, the portion where the convex portion 4 is formed on the wiping sheet), The alignment of the cross-section can be changed, so it is not susceptible to resistance caused by the high-pressure water flow W. The long diameter of the cross-section of the shaped fiber is the alignment along the direction orthogonal to the surface of the wiping sheet (that is, the short-diameter alignment ). In this way, in the concave portion 3 and the convex portion 4, the alignment of the cross section of the profiled fiber is different.

On the wiping sheet, in addition to the concave-convex portions of the macro pattern, in order to form a plurality of linear concave portions 5, as shown in FIG. 5, the concave-convex portion forming member 50 and the second support belt 42 are also arranged, for example, as shown in FIG. 8 The linear recess forming member 60 of the structure shown in (a) and (b) can form the linear recess 5 on one surface of the wiping sheet.

The linear concave portion forming member 60 shown in FIG. 8(a) includes a linear first linear member 60a and a spiral second linear member 60b. The area formed between the two linear materials can circulate water. The two linear materials 60a and 60b include metal and synthetic resin.

The first linear member 60a has a cross section of, for example, a circle or an ellipse, and its plural roots are arranged at substantially equal intervals in a direction crossing the MD direction so as to be parallel to each other. In addition, the first linear members 60a are preferably arranged so as to be located on the same plane. Moreover, one spiral second linear material 60b is wound around two adjacent linear linear materials 60a. In this figure, the direction and pitch of the adjacent second linear members 60b are the same, but they 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 juxtaposed. The second linear member 60b is curled in such a manner that the line connecting the center of the linear member 60b in its cross section at any position of the second linear member 60b is parallel to the first linear member 60a. The cross section of the second linear material 60b may be circular or elliptical. The second linear material 60b may be curled by drawing an ellipse as shown in FIG. 8(b), or by drawing a true circle or a triangle as shown in FIG. 8(b).

The interval Ap between the adjacent first linear members 60a of the linear recess forming member 60 (pitch Ap; see FIG. 8(a)) determines the length L1 of the linear recess 5 (see FIG. 4(e)), The length L1 of the linear recess 5 may be appropriately adjusted, and is preferably 1 mm or more and 50 mm or less, and more preferably 3 mm or more and 20 mm or less. Moreover, the curl interval Bp (pitch Bp; see FIG. 8(a)) between the second linear members 60b of the linear recess forming member 60 determines the interval L2 of the linear recess 5 (see FIG. 4(e)), It can be appropriately adjusted according to the required interval L2, and 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 material 60b (see FIG. 8(b)) determines the width W1 of the linear recess 5 (see FIG. 4(e)), and the width W1 of the linear recess 5 The appropriate adjustment 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. In addition, the curl diameter Bh of the second linear material 60b determines the depth of the linear recess 5 in the sheet thickness direction, and can be appropriately adjusted by the relationship between the water pressure of the high-pressure water flow and the conveying speed.

Returning to the method of forming the linear concave portion 5, the water flow sprayed from the second water flow nozzle 41 to the upper surface side of the fiber assembly 1A is to be lower surface to the concave portion forming convex portion 50a in the concave and convex portion forming member 50 Press against the surface tightly. Then, the shaped fiber 2 located in the concave portion 50b for forming the convex portion of the concave-convex portion forming member 50 protrudes from the concave portion 50b. In addition, the deformed fiber 2 protruding from the concave portion 50b for convex portion formation is pressed against the second linear material 60b of the linear concave portion forming member 60 by high-pressure water flow. The fiber aggregate 1A pressed against the second linear material 60b is sunk in the thickness direction of the aggregate 1A, and a plurality of linear recesses 5 complementary to the shape of the second linear material 60b are formed.

The width Bd of the second linear material 60b is smaller than the width of the concave portion forming convex portion 50a. Therefore, the shaped fibers located on the second linear material 60b are pressed against the second linear material 60b by high-pressure water flow, and, The fibers on the space 60R side formed by dividing between the adjacent second linear materials 60b are separated by the linear materials 60b. The space 60R is configured to be smaller than the area of the convex portion forming concave portion 50b in the concave-convex portion forming member 50. Therefore, the pressure of the high-pressure water flow passing through the space 60R is higher than the pressure of the sprayed water. Thereby, the shaped fiber existing in the space 60R is less susceptible to pressure (external force) caused by the high-pressure water flow W, and the long diameter of the cross-section of the shaped fiber is oriented toward the direction orthogonal to the plane of the wiping sheet The ratio is further higher than the ratio of the profiled fibers present in the convex portion 4 (that is, the ratio of short-axis alignment is further increased). In addition, the shaped fibers are further separated by the second linear material 60b, whereby the longitudinal direction of the shaped fibers is aligned in the direction in which the second linear material 60b extends. That is, the irregular fibers 2 existing in the first region 7 between the linear recesses 5 formed are aligned in the direction in which the linear recesses 5 extend. In this way, a concave-convex portion having a macroscopic pattern of curved portions can be formed on one surface of the wiping sheet, and linear concave portions can be formed, and the alignment of the long diameters of the cross-sections of the profiled fibers existing in the adjacent linear concave portions is different.

After the fiber assembly 1A manufactured as described above is formed into a rectangular shape as shown in FIG. 2, for example, it can be directly used as a dry wiping sheet, or the fiber assembly 1A of the wiping sheet 1 can carry a washing solution ( Loading step) and used as a wet wipe sheet. In the washing liquid loading step, the loading amount of the washing liquid loaded on the fiber assembly 1A is when the size of the wiping sheet 1 is 285 mm×205 mm as described in the embodiment described later, for example It is preferably 1 g/piece or more, more preferably 10 g/piece or more, preferably 40 g/piece or less, and further preferably 25 g/piece or less. In other words, it is preferably 17 g/m ² or more, more preferably 117 g/m ² or more, preferably 690 g/m ² or less, and further preferably 430 g/m ² or less.

The wiping sheet manufactured in this way can also be used as a stand-alone wiping sheet or a cleaning appliance such as a scraper, etc., and can be used for building tools such as floors, walls, cabinets, window glass, mirrors, doors, door handles, etc. , Blankets, carpets, desks and other furniture, kitchens, baths, body wipes, or sanitary supplies, packaging, etc.

In the above, the present invention has been described based on its preferred embodiments. However, the present invention is not limited to the above embodiments. For example, the concavo-convex portion of the macro pattern shown in FIG. 3 may be formed on only one side, however, in addition to one side, it may be further formed on the other side. In this case, after forming the concave-convex portion of the macro-pattern on one surface of the fiber assembly through the pattern-forming step, the fiber assembly is turned over, and then the pattern-forming step is performed, whereby the concave-convex macro-pattern can also be formed on the other surface unit.

In order to form a fiber assembly including fibers other than shaped fibers, for example, a second card can be arranged in the web forming section 20, and a fiber web other than shaped fibers can be wound out of the card and stacked on the shaped Fiber cotton net. Thereafter, by performing the cross-linking step, a fiber assembly including fibers in addition to the profiled fibers can be formed.

In addition, as a method of manufacturing the wiping sheet, the interlacing step and the pattern forming step are performed in different steps, however, these may also be performed in the same step. For example, in the interlacing step, a concavo-convex part forming member 50 (a linear concave part forming member 60 may be further arranged as necessary) may be arranged between the cotton web of the irregular fiber and the first support belt 32, and the fibers may be interlaced to form a macro pattern Concavo-convex parts, linear concave parts.

Moreover, in the pattern forming step, the formation of the concave-convex portion of the macro pattern and the formation of the linear concave portion are performed in the same step, however, these formations may also be performed in different steps. For example, in the pattern forming step, after only the concavo-convex portion forming member 50 is disposed and the concavo-convex portion of the macroscopic pattern is formed on one surface of the fiber assembly, only the linear concave portion forming member 60 is disposed and the water flow is sprayed, thereby, the A linear recess 5 is formed on the entire surface of the wiping sheet.

Regarding the above-mentioned embodiment of the present invention, the following wiping sheet is further disclosed. ＜1＞ A wiping sheet, which has a concave-convex portion with a macroscopic pattern on at least one side, and has a fiber assembly including shaped fibers with a flat cross-section, In the concave portion and the convex portion constituting the concave-convex portion, the profiled fibers present in the concave portion are oriented such that the long diameter of the cross-section is approximately along the direction of the surface of the wiping sheet, and the profiled fibers present in the convex portion are transverse The long diameter of the cross-section is generally directed along the surface orthogonal to the surface of the wiping sheet.

＜2＞ The wiping sheet as described in <1> above, wherein the profiled fiber has a long diameter and a short diameter in its cross section. ＜3＞ The wiping sheet as described above in <1> or <2>, wherein the profiled fibers present in the recessed portion are more than 50% of the profiled fibers based on the number of fibers when 10 or more profiled fibers are the object of observation The angle between the long diameter of the fiber and the surface of the wiping sheet does not reach 45 degrees, and when the above-mentioned shaped fiber existing in the above-mentioned convex portion takes 10 or more shaped fibers as the observation object, the shaped is calculated on the basis of the number The angle between the long diameter of the profiled fiber of more than 50% of the fiber and the surface of the wiping sheet is more than 45 degrees. ＜4＞ The wiping sheet according to any one of the above <1> to <3>, wherein, in addition to the concave-convex portion of the macro pattern, a linear concave portion that is recessed from one surface of the wiping sheet toward the other surface and extends linearly to face in one direction There are a number of ways, The profiled fibers present in the first area are oriented such that the major axis of the cross-section is along a plane orthogonal to the surface of the wiping sheet, and the first area is located perpendicular to the direction in which the linear recess extends Between two adjacent linear recesses in the direction of The ratio of the longitudinal direction of the cross-section of the profiled fiber in the first region to the direction orthogonal to the surface of the wiping sheet is higher than that of the profiled fiber in the convex portion The long diameter of the cross-section of the fiber is oriented to the ratio of alignment in the direction orthogonal to the surface of the wiping sheet.

＜5＞ The wiping sheet as described in <4> above, wherein the linear recesses are formed in plural so that the extending direction thereof is along the one direction. ＜6＞ A wiping sheet as described above in <4> or <5>, wherein when observing a row of one of the linear recesses in the one direction, the adjacent linear recesses are symmetrical in a direction orthogonal to the one direction Axis and line symmetry. ＜7＞ The wiping sheet according to any one of the above <4> to <6>, wherein when observing the row of one of the linear recesses along the one direction, the direction in which the linear recesses extend with each linear recess is approximately the same A plurality of directions are formed. ＜8＞ The wiping sheet according to any one of the above <4> to <7>, wherein the row of two linear recesses extending in the above-mentioned one direction and adjacent in the direction orthogonal to the one-direction is symmetrical with the above-mentioned one direction Axis and line symmetry. ＜9＞ The wiping sheet according to any one of the above <4> to <8>, wherein the profiled fibers present in the first area are aligned with the profiled fibers present in the second area in the direction in which the linear recess extends, the The second region is located between two adjacent linear recesses in the direction in which the linear recesses extend. ＜10＞ The wiping sheet according to any one of the above <1> to <9>, wherein the scrim is disposed in the central region in the thickness direction of the fiber assembly. ＜11＞ The wiping sheet according to any one of <1> to <10> above is impregnated with a cleaning solution.

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

＜18＞ The wiping sheet according to any one of the above <1> to <16>, which includes a fiber assembly of a multilayer structure, the fiber assembly of the multilayer structure includes a layer including the first profiled fiber, and includes the first profiled fiber Different second layer of the above-mentioned shaped fiber. ＜19＞ The wiping sheet according to any one of the above <1> to <15>, which includes a fiber assembly having a multilayer structure, the fiber assembly having a multilayer structure including a layer including the above-mentioned shaped fibers and a layer not including the above-mentioned shaped fibers. ＜20＞ The wiping sheet according to any one of the above <1> to <15> and <19>, which is obtained by superimposing a first fiber assembly containing the above-mentioned shaped fiber and a second fiber assembly not containing the above-mentioned shaped fiber Multi-layer build-up structure. ＜21＞ The wiping sheet according to any one of the above <1> to <15>, which is a multi-layered laminated structure obtained by superposing a fiber assembly including the above-mentioned shaped fibers and other sheet materials other than the fiber assembly. ＜22＞ The wiping sheet according to any one of the above <1> to <17>, wherein the ratio of the profiled fibers is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more.

＜23＞ The wiping sheet according to any one of <1> to <22> above, which contains fibers having a true cross section. ＜24＞ The wiping sheet as described in <23> above, wherein the fibers having a true cross section are preferably contained in a ratio of 50% by mass or less, more preferably in a ratio of 40% by mass or less, more preferably in a ratio of 30% by mass Contains at a rate below %. ＜25＞ The wiping sheet according to any one of the above <1> to <24>, wherein the profiled fiber preferably has at least one convex portion in its cross-sectional shape, further preferably has two or more, and more preferably has 3 More than one, the convex portion has a sharp top. ＜26＞ The wiping sheet as described in <25> above, wherein the profiled fiber has 8 sharp tops. ＜27＞ The wiping sheet according to any one of the above <1> to <26>, when observing the outline of the cross-section of the profiled fiber along the circumferential direction, it has a plurality of convex portions, and is located between adjacent convex portions The shape of the concave part. [Example]

Hereinafter, the present invention will be described in further detail with examples. However, the scope of the present invention is not limited to this embodiment.

[Example 1] As shown in FIG. 1(b), spunlace was performed using irregular-shaped fibers with a cross-sectional shape of a fiber containing a thermoplastic resin in a cross-section, and a thin mesh gauze (PP) was produced in the central region in the thickness direction (Polypropylene) fiber assembly with a wire diameter of about 200 μm and a basis weight of 5 g/m ² ). The fiber composition of the fiber assembly consists of profiled fibers (PET (polyethylene terephthalate, polyethylene terephthalate), fineness 1.7 dtex): true round fibers (acrylic, fineness 1.0 dtex): Flat fiber (made of rayon, fineness 1.7 dtex) = 70:15:15, the average fiber diameter is about 12 μm. After shaping the size of the fiber assembly to 285 mm × 205 mm, the cleaning solution was impregnated with 290 g/m ^{2 to} make the target wet wipe sheet. The basis weight of the wiping sheet is 70 g/m ² .

[Comparative Example 1] Fibers containing thermoplastic resin in a cross-sectional shape with a true circular shape are spunlaced to produce a fiber assembly. The fiber composition of the fiber assembly consists of true round fibers (made of PET, fineness 1.45 dtex) according to the mass ratio: true round fibers (made of acrylic, fineness 1.0 dtex): flat fibers (made of rayon, fineness 1.7 dtex) )=70:15:15, the average fiber diameter is about 11 μm. Other conditions were the same as in Example 1, and a wet wipe sheet was produced.

[Evaluation of hair catchability] In this evaluation, every 10 piles (1820 mm x 910 mm) of wood floors with 20 pieces of 10 cm hair (DAG floor, manufactured by Beihui Co., Ltd.) were wiped in 6 copies. The direction of the sheet during wiping is to set the width direction Y in FIG. 3 to the same direction as the wiping direction. The number of hairs collected on the wiping sheet after wiping was measured separately to evaluate the hair collecting ability. The results are shown in Table 1.

[Evaluation of particulate trapping properties] In this evaluation, on a wooden floor with a length (wiping direction) of 90 cm × a width of 90 cm (DAG floor, manufactured by Beihui Co., Ltd.), within a range of 15 cm to 30 cm from the front of the wiping direction, the length is 15 cm × An area with a width of 90 cm is spread with 0.1 g of 7 types of test powders (particle size: 5 to 75 μm) or 11 types of test powders (particle size: 1 to 8 μm) specified in JIS Z 8901. To this wooden floor, the wiping sheet of the example or the comparative example was wiped back and forth twice every 30 cm in the wiping direction. Perform 6 sets of this operation. The direction of the sheet at the time of wiping sets the width direction Y in FIG. 3 to the same direction as the wiping direction. The change in sheet quality before and after wiping was measured, and the particulate trapping property was evaluated. The results are shown in Table 1.

[Table 1]

In Table 1, the symbol "◎" means "very good catchability", the symbol "○" means "good catchability", and the symbol "△" means "slight catchability". As shown in Table 1, it can be judged that the wiping sheet of the present invention contains profiled fibers as its constituent fibers, and possesses both high particulate particle trapping ability and high hair dirt trapping ability. . In particular, from the evaluation of the hair trapping property, it can be determined that the wiping sheet of Example 1 has a higher trapping property of hair dirt even when it is made into a wet wiping sheet. [Industry availability]

According to the present invention, it is possible to provide a wiping sheet that has both high trapping properties of particulate dirt and high trapping properties of fiber dirt such as hair.

1‧‧‧ wipe sheet 1A‧‧‧ Fiber assembly 2‧‧‧ shaped fiber 3‧‧‧recess 4‧‧‧Convex 5‧‧‧Linear recess 5A‧‧‧Symmetry axis 5L‧‧‧Line recess 5S‧‧‧Symmetry axis 7‧‧‧ Region 1 8‧‧‧ Region 2 10‧‧‧Manufacturing device 15‧‧‧Rare yarn 20‧‧‧Cotton web forming department 21‧‧‧Carding machine 22‧‧‧Guide roller 25‧‧‧scrap yarn roller 30‧‧‧Spunlace Department 31‧‧‧The first water flow nozzle 32‧‧‧The first support zone 40‧‧‧pattern forming department 41‧‧‧ 2nd water flow nozzle 42‧‧‧ 2nd support zone 50‧‧‧Convex and concave part forming member 50a‧‧‧Convex part for forming concave part 50b‧‧‧Convex part for forming convex part 50c‧‧‧Drain hole 60‧‧‧Linear recess forming member 60a‧‧‧The first linear material 60b‧‧‧The second linear material 60R‧‧‧Space A‧‧‧Length Ap‧‧‧Interval (Pitch) B‧‧‧Length Bd‧‧‧Width Bh‧‧‧crimp diameter Bp‧‧‧Interval (Pitch) C‧‧‧Length D‧‧‧Length L1‧‧‧Length L2‧‧‧Interval L3‧‧‧Interval MD‧‧‧Conveying direction P‧‧‧Convex R‧‧‧recess W‧‧‧High pressure water flow W1‧‧‧Width X‧‧‧length direction Y‧‧‧Width direction

1(a) and (b) are top views of the cross-sectional shapes of the profiled fibers 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 under a scanning electron microscope using a concave portion of a wiping sheet having a profiled fiber of the cross-sectional shape shown in FIG. 1(b), and FIG. 3(b) is used with FIG. 1( b) The observation image under the scanning electron microscope of the convex portion of the wiping sheet of the shaped fiber of the cross-sectional shape shown. 4(a) to (e) are enlarged views of the main part of the linear recess in the wiping sheet of the present invention. FIG. 5 is a schematic view of a manufacturing apparatus that can be preferably used for manufacturing the wiping sheet of the present invention. FIG. 6 is a schematic view of the concave-convex portion forming member in the manufacturing apparatus shown in FIG. 5. Fig. 7 is a schematic diagram showing the alignment of the cross-section of the profiled fiber during the manufacture of 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 line A-A of FIG. 8(a).

1‧‧‧ wipe sheet

1A‧‧‧ Fiber assembly

3‧‧‧recess

4‧‧‧Convex

5‧‧‧Linear recess

X‧‧‧length direction

Y‧‧‧Width direction

Claims (27)

A wiping sheet, which has a concave-convex portion with a macroscopic pattern on at least one side, and has a fiber assembly including shaped fibers with a flat cross-section, In the concave portion and the convex portion constituting the concave-convex portion, the profiled fibers present in the concave portion are oriented such that the long diameter of the cross-section is approximately along the direction of the surface of the wiping sheet, and the profiled fibers present in the convex portion are transverse The long diameter of the cross-section is generally directed along the surface orthogonal to the surface of the wiping sheet. The wiping sheet according to claim 1, wherein the above-mentioned shaped fiber has a long diameter and a short diameter in its cross section. The wiping sheet according to claim 1, wherein the above-mentioned shaped fibers existing in the above-mentioned recesses are more than 50% of the length and length of the shaped fibers based on the number basis when 10 or more shaped fibers are taken as the object of observation The angle formed by wiping the surface of the sheet does not reach 45 degrees, and, When the above-mentioned profiled fibers present in the above-mentioned convex portion are 10 or more profiled fibers as the object of observation, the angle between the long diameter of the profiled fibers of 50% or more of the profiled fibers and the surface of the wiping sheet is calculated on the basis of the number It is above 45 degrees. The wiping sheet according to claim 1, wherein in addition to the above-mentioned concave-convex portions of the macro pattern, a plurality of linear concave portions which are recessed from one surface of the above-mentioned wiping sheet toward the other surface and extend linearly are formed to face one direction, The profiled fibers present in the first area are oriented such that the major axis of the cross-section is along a plane orthogonal to the surface of the wiping sheet, and the first area is located perpendicular to the direction in which the linear recess extends Between two adjacent linear recesses in the direction of The ratio of the longitudinal direction of the cross-section of the profiled fiber in the first region to the direction orthogonal to the surface of the wiping sheet is higher than that of the profiled fiber in the convex portion The long diameter of the cross-section of the fiber is oriented to the ratio of alignment in the direction orthogonal to the surface of the wiping sheet. The wiping sheet according to claim 4, wherein a plurality of the linear recesses are formed so that the direction in which the linear recesses extend is along the one direction. The wiping sheet according to claim 4, wherein when observing the row of one of the linear recesses in 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 claim 4, wherein when observing a row of one of the linear recesses in the above-mentioned one direction, a plurality of linear recesses are formed so that the directions in which the linear recesses extend are substantially the same direction. The wiping sheet according to claim 4, wherein the row of two linear recesses extending in the above-mentioned one direction and adjacent in the direction orthogonal to the one direction is line-symmetrical with the one direction as the axis of symmetry. The wiping sheet according to claim 4, wherein the profiled fibers present in the first area are aligned with the profiled fibers present in the second area in the direction in which the linear recess extends, and the second area is located in the linear shape Between two adjacent linear recesses in the direction in which the recesses extend. The wiping sheet according to claim 1, wherein the scrim is disposed in the central region in the thickness direction of the fiber assembly. If the wiping sheet of claim 1, it is impregnated with cleaning liquid. The wiping sheet according to claim 1, wherein the above-mentioned profiled fibers are fibers containing thermoplastic resin. The wiping sheet according to claim 1, wherein the above-mentioned fiber assembly system is mainly composed of the above-mentioned profiled fibers. The wiping sheet according to claim 1, wherein the fiber assembly system contains 50% by mass or more of the profiled fibers. The wiping sheet according to claim 1, wherein the fibers constituting the above-mentioned fiber assembly are not fused with each other. The wiping sheet according to claim 1, which is composed only of a fiber assembly containing the above-mentioned shaped fibers. The wiping sheet according to claim 1, which contains a single layer of fiber assembly. The wiping sheet according to claim 1, which includes a fiber assembly of a multilayer structure, the fiber assembly of a multilayer structure having a layer including a first shaped fiber and a second shaped fiber that is different from the first shaped fiber Floor. The wiping sheet according to claim 1 includes a fiber assembly of a multilayer structure, and the fiber assembly of the multilayer structure includes a layer including the above-mentioned shaped fibers and a layer not including the above-mentioned shaped fibers. The wiping sheet according to claim 1 has a multi-layered laminated structure obtained by overlapping a first fiber assembly containing the above-mentioned shaped fibers and a second fiber assembly not containing the above-mentioned shaped fibers. The wiping sheet according to claim 1 is a multi-layered laminated structure obtained by overlapping a fiber assembly including the above-described shaped fibers and other sheet materials other than the fiber assembly. The wiping sheet according to claim 1, wherein the ratio of the above-mentioned profiled fibers is 50% by mass or more. The wiping sheet according to claim 1, which contains fibers with a true cross section. The wiping sheet according to claim 23, wherein the above-mentioned fibers having a true cross section are contained at a ratio of 50% by mass or less. The wiping sheet according to claim 1, wherein the profiled fiber has at least one convex portion in its cross-sectional shape, and the convex portion has a sharp top. The wiping sheet according to claim 25, wherein the above-mentioned shaped fiber has 8 sharp tops. The wiping sheet according to claim 1 has a shape in which a plurality of convex portions and concave portions between adjacent convex portions are observed when the outline of the cross-section of the profiled fiber is viewed in the circumferential direction.

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