JP6986940B2 - 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 Documents 1 and 2 disclose a sheet in which a non-woven fabric is formed into a large number of uneven shapes by using a heat-shrinkable mesh sheet or a fiber layer in order to maintain the strength of the nonwoven fabric and increase its flexibility. Has been done.

Japanese Unexamined Patent Publication No. 05-025763 Japanese Unexamined Patent Publication No. 08-158226

In general, a non-woven fabric used for a wiping sheet for cleaning hard surfaces such as flooring, walls and furniture needs to have both a dirt collecting property and the strength of the non-woven fabric itself. The dirt collection property and strength can be adjusted by the degree of freedom of the fibers constituting the non-woven fabric, that is, the ease of movement of the fibers, but they are incompatible with each other. For example, when a non-woven fabric having a high degree of freedom of fibers is used, the collecting property of dirt such as hair and fine particles is improved, but the strength of the wiping sheet itself is lowered, and it may not be able to withstand actual use. On the other hand, when a non-woven fabric having a low degree of freedom of fibers is used, the strength of the wiping sheet itself increases, but the collectability of dirt decreases.

The nonwoven fabrics of Patent Documents 1 and 2 increase the strength of the entire nonwoven fabric by adopting a heat-shrinkable mesh sheet or fiber layer, but on the other hand, the degree of freedom of the fibers constituting the nonwoven fabric is the mesh sheet or the fiber layer. It is limited by the fiber layer. Therefore, in using the non-woven fabric described in these documents as a wiping sheet, there is room for improvement from the viewpoint of sufficiently enhancing the collectability of dirt such as dust.

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

The present invention includes a fiber aggregate and a plurality of strand-shaped supports that support the fiber aggregate, and the fiber aggregate and the support form an integral entangled state. And
A plurality of the supports extend in one direction and do not intersect with other supports.
The ridges and ridges that are composed of the fiber aggregate and extend in a direction intersecting the one direction provide a wiping sheet that is alternately provided in the one direction.

According to the present invention, it is possible to provide a wiping sheet having excellent dust collecting property without reducing the degree of freedom of the constituent fibers of the sheet.

1 (a) is a schematic perspective view showing an embodiment of the wiping sheet of the present invention, and FIG. 1 (b) is a schematic cross-sectional view taken along line I-I of the wiping sheet of FIG. 1 (a). be. FIG. 2 is a schematic view of a manufacturing apparatus used for manufacturing the wiping sheet of the present invention. FIG. 3 is a schematic diagram showing one form of arrangement of support strands in an entangled body. FIG. 4 is a schematic diagram showing another form of arrangement of support strands in an entangled body. 5A is a schematic cross-sectional view taken along line II-II in the entanglement before the heating step in FIG. 3, and FIG. 5B is a state after the heating step of the entanglement in FIG. 5A. It is a cross-sectional schematic diagram which shows. FIG. 6 is a schematic perspective view showing another embodiment of the wiping sheet of the present invention. FIG. 7 is an enlarged view of a main part showing a form of arrangement of the support in FIG. FIG. 8 is a schematic perspective view showing still another form of the arrangement of the support strands in the entangled body. 9 (a) is a schematic cross-sectional view taken along the line III-III in the entanglement before the heating step in FIG. 8, and FIG. 9 (b) is a state after the heating step in FIG. 9 (a). It is a cross-sectional schematic diagram which shows. FIG. 10 is a schematic top view showing still another embodiment of the wiping sheet of the present invention. FIG. 11 is an enlarged view of a main part showing a form of arrangement of the support in FIG. FIG. 12 is a schematic perspective view showing still another form of the arrangement of the support strands in the entangled body. FIG. 13 is a graph showing the dust collection rate in the wiping sheets of Examples and Comparative Examples.

Hereinafter, the wiping sheet of the present invention will be described based on the preferred embodiment thereof with reference to the drawings. 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, body and body. Includes cleaning of equipment related to.

1 (a) and 1 (b) show an embodiment of the wiping sheet of the present invention. The wiping sheet 1 has a first surface 1a and a second surface 1b located on the opposite side thereof. The wiping sheet 1 includes a fiber aggregate 2 and a plurality of strand-shaped supports 3 that support the fiber aggregate 2. The fiber aggregate 2 and the support 3 form an integral entangled state. Specifically, the constituent fibers of the fiber aggregate 2 are entangled with each other, and the constituent fibers and the support 3 are entangled with each other. Each support 3 extends along one direction (X direction in FIG. 1A) of the wiping sheet. Each support 3 is arranged without intersecting the adjacent support 3. Each support 3 extends continuously along the X direction over the entire length of the wiping sheet 1 without interruption. The arrangement state of the support 3 will be described in detail in the method for manufacturing the wiping sheet described later.

The wiping sheet 1 is provided with a ridge portion 1P composed of a fiber aggregate 2 and a concave portion 1R on the first surface 1a thereof. The ridge portion 1P and the concave portion 1R are arranged so as to extend in the Y direction, which is a direction intersecting the X direction, which is the extension direction of the support 3. The X direction and the Y direction are orthogonal to each other. As shown in FIG. 1 (b), when the wiping sheet 1 is viewed along the X direction, the convex portions 1P and the concave portions 1R are alternately arranged in the same direction.

The second surface 1b of the wiping sheet 1 has a complementary shape to the first surface 1a. Specifically, the concave portion 1R'is provided at the position of the second surface 1b corresponding to the position where the convex portion 1P is provided on the first surface 1a. Further, the convex portion 1P'is provided at the position of the second surface 1b corresponding to the position where the concave portion 1R is provided on the first surface 1a. Therefore, when the wiping sheet 1 is viewed along the Z direction, which is the thickness direction thereof, the wiping sheet 1 has a corrugated shape.

As described above, the wiping sheet 1 is formed with ridges and ridges extending in one direction alternately on at least one surface. Since the wiping sheet 1 has such a shape, the dust collecting property of the wiping sheet 1 can be improved. Further, since the convex portions and the concave portions extending in one direction are alternately formed on each surface of the wiping sheet 1, the wiping sheet 1 can be used without distinction between the front and back sides, and dust can be collected. The amount can be improved.

As described above, the fiber aggregate 2 is a non-woven fabric formed by entwining the fibers constituting the fiber aggregate 2. From the viewpoint of increasing the degree of freedom of the constituent fibers of the fiber aggregate 2 and enhancing the dust collection property, the fiber aggregate 2 has a shape-retaining property only by the entanglement of the constituent fibers, and the synthetic fibers are used with each other. Is preferably not fused and bonded.

The fibers constituting the fiber aggregate 2 may be either synthetic fibers or natural fibers. Examples of synthetic fibers include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as polyethylene terephthalate, polyamide fibers such as nylon 6 and nylon 66, vinyl fibers such as polyvinyl chloride and polystyrene, and polyacrylic acid and polymethacrylic acid. Examples thereof include acrylic fibers such as methyl and fluororesin fibers such as polyvinylfluoroethylene. Examples of natural fibers include various cellulose fibers such as pulp, cotton, rayon, lyocell and tencel. These fibers may be used alone or in combination of two or more. Regardless of the type of fiber constituting the fiber aggregate 2, it is preferable that the length of the fiber does not substantially change due to heat. That is, it is preferable that the fibers constituting the fiber aggregate 2 are neither heat-stretchable fibers nor heat-extensible fibers.

The fiber constituting the fiber aggregate 2 preferably has a fineness of 0.6 dtex or more, more preferably 1 dtex or more, preferably 3.5 dtex or less, and further preferably 2 dtex or less. .. Specifically, the fineness of the fibers constituting the fiber aggregate 2 is preferably 0.6 dtex or more and 3.5 dtex or less, and more preferably 1 dtex or more and 2 dtex or less. The fibers constituting the fiber aggregate 2 may be continuous filaments or staple fibers depending on the method for producing the fiber aggregate 2. In the case of staple fibers, the average fiber length 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. By having such a fiber diameter and a fiber length, it is possible to obtain a fiber aggregate 2 having a high degree of flexibility and a high degree of freedom of the fiber.

From the viewpoint of developing the strength of the wiping sheet, the basis weight of the fiber aggregate 2 constituting the wiping sheet 1 ^{is preferably 20 g / m 2} or more, more preferably 40 g / m 2 or more, and more preferably 200 ^{g / m / 2.} It is preferably m ² or less, and more preferably 100 g / m ² or less.

The thickness H1 of the wiping sheet 1 (see FIG. 1B) is preferably 1 mm or more, more preferably 2 mm or more, and the upper limit thereof is preferably 10 mm or less, preferably 5 mm or less. Is even more preferable. Having such a thickness makes it possible to improve the handleability of the wiping sheet 1 and further enhance the collectability of dust. The thickness H1 of the wiping sheet 1 is measured using a thickness measuring instrument FS-60DS manufactured by Daiei Kagaku Seiki Seisakusho under a load of 0.3 kPa.

From the viewpoint of enhancing the collectability of dust on the surface to be wiped, it is preferable that the constituent fibers of the fiber aggregate 2 in the wiping sheet 1 are oriented in the thickness direction Z of the sheet 1. In addition, "aligned in the thickness direction Z" means that when observing an arbitrary portion in the cross section of the wiping sheet 1 in the thickness direction, a virtual straight line extending along the thickness direction and the orientation direction of the constituent fibers are formed. It means that the angle is 50 ° or less. In particular, when observing 10 arbitrary parts in the cross section of the wiping sheet 1 in the thickness direction, 5 or more parts where the angle between the virtual straight line and the orientation direction of the constituent fibers is 50 ° or less are observed. It is preferable, and it is more preferable that 7 or more places are observed. The orientation of the fiber can be evaluated by the orientation angle and the orientation strength of the fiber, and can be evaluated according to the method described in, for example, Japanese Patent Application Laid-Open No. 2013-249558. Such an orientation state of the fiber can be realized by a suitable manufacturing method of the wiping sheet 1 described later.

When focusing on the first surface 1a of the wiping sheet 1, the convex portion 1P has a shape in which the top portion P1 draws a gentle curve convex toward the first surface 1a side in a cross-sectional view along the X direction. There is. The convex side wall portions P2 and P2 connected to the top portion P1 are substantially straight lines, and the distance between them gradually increases toward the second surface 1b. On the other hand, the concave portion 1R has a shape in which the bottommost portion R1 draws a gentle curve convex toward the second surface 1b side in a cross-sectional view along the X direction. Each concave side wall portion R2, R2 connected to the bottommost portion R1 is a substantially straight line, and the distance between the two is gradually widened toward the first surface 1a, and is smoothly aligned with the above-mentioned convex side wall portions P2 and P2. It is connected. Since the second surface 1b of the wiping sheet 1 has a complementary shape to the first surface 1a as described above, the shape of the convex portion 1P'and the concave portion 1R'of the second surface 1b is the first. The description regarding the shape of the convex portion 1P and the concave portion 1R of the one surface 1a is applied.

On the first surface 1a of the wiping sheet 1, the distance Dp (see FIG. 1B) between the adjacent convex portions 1P is preferably 0.1 mm or more, more preferably 0.5 mm or more. It is more preferably 1 mm or more. The interval Dp is preferably 30 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less. Specifically, the interval Dp is preferably 0.1 mm or more and 30 mm or less, more preferably 0.5 mm or more and 15 mm or less, and further preferably 1 mm or more and 10 mm or less. On the other hand, the distance Dr (see FIG. 1B) between the adjacent concave portions 1R is preferably 0.1 mm or more, more preferably 0.5 mm or more, and further preferably 1 mm or more. .. The spacing Dr is preferably 30 mm or less, more preferably 15 mm or less, and even more preferably 10 mm or less. Specifically, the interval Dp is preferably 0.1 mm or more and 30 mm or less, more preferably 0.5 mm or more and 15 mm or less, and further preferably 1 mm or more and 10 mm or less. By setting the intervals Dp and Dr in this way, it is possible to sandwich and collect dust having a large particle size between adjacent convex and concave portions, which is preferable. The same applies to the spacing between the convex portions 1P'and the spacing between the concave portions 1R'on the second surface 1b of the wiping sheet 1.

On the first surface 1a of the wiping sheet 1, the ridge portion 1P may have the same width over the entire extending direction, or the width may change regularly or irregularly. Similarly, the recessed portion 1R may have the same width over the entire extending direction, or the width may change regularly or irregularly. Whether the widths of the convex portion 1P and the concave portion 1R are constant or change depends on the manufacturing conditions of the wiping sheet 1, the basis weight, the thickness of the fiber aggregate 2, the type of constituent fibers, and the like. .. The same applies to the width of the convex portion 1P'and the width of the concave portion 1R' on the second surface 1b of the wiping sheet 1.

The support 3 is in the form of a strand that can be entangled with the constituent fibers of the fiber aggregate 2. The support 3 extends along the X direction of the wiping sheet 1 and over the entire length of the wiping sheet 1. A plurality of supports 3 are arranged. As shown in FIG. 1 (b), the support 3 is arranged at a substantially central portion in the thickness direction Z when the wiping sheet 1 is viewed along the thickness direction Z. The support 3 maintains the formed state of the convex portions 1P, 1P'and the concave portions 1R, 1R' provided on the wiping sheet 1. Further, since the wiping sheet 1 includes a plurality of supports 3, even when the degree of entanglement between the constituent fibers is weakened in order to increase the degree of freedom of the constituent fibers of the fiber aggregate 2, the wiping sheet 1 It also has the advantage that it can have sufficient strength for practical use.

Examples of the raw material of the support 3 include a polyolefin resin such as polyethylene and polypropylene, a polyester resin such as polyethylene terephthalate, a polyamide resin such as nylon 6 and nylon 66, an acrylonitrile resin such as polyvinylidene chloride, and vinyl such as polyvinyl chloride and polystyrene. A vinylidene-based resin, a vinylidene-based resin such as polyvinylidene chloride, or the like can be used.

The support 3 is preferably non-stretchable from the viewpoint of maintaining the structure of the convex portion 1P and the concave portion 1R in the wiping sheet 1 at the time of wiping and enhancing the dust collection property. Non-stretchable means that the length L1 when a tension of 10 N is applied is 1.2 times or less the original length L0 (that is, L1 / L0 is 1.2 or less) and the original length. The length L2 when the tension is applied to extend the tension twice with respect to L0 and the tension is released from that state is 1.8 times or more with respect to L0 (that is, L2 / L0 is 1.8 times or more). To say. Further, in the production of the wiping sheet 1 described later, from the viewpoint of forming the convex portion 1P and the concave portion 1R with high production efficiency, the support 3 is preferably formed by using a raw material having heat shrinkage. The non-stretchable and heat-shrinkable support 3 can be manufactured by using the above-mentioned raw materials.

As shown in FIG. 1A, the supports 3 extend substantially parallel to each other, and the supports 3 do not intersect with each other. The supports 3 may extend non-parallel, provided they do not intersect each other. When the supports extend substantially parallel to each other, the distance D1 between the adjacent supports 3 is obtained from the viewpoint of achieving both the strength of the wiping sheet 1 and the formation of the convex portion 1P and the concave portion 1R (FIG. 1). (See (a)) is preferably 5 mm or more, more preferably 10 mm or more, more preferably 50 mm or less, and even more preferably 30 mm or less. Specifically, the distance D1 is preferably 5 mm or more and 50 mm or less, and more preferably 10 mm or more and 30 mm or less. When the supports extend non-parallel to each other, the distance D1 is the distance at the position closest to the distance.

In particular, as shown in FIG. 1A, when the support 3 extends continuously along the X direction without interruption, the number of the supports 3 is preferably 3 or more in a width of 10 cm. More than 10 pieces are more preferable, 10 pieces or more are more preferable, and from the viewpoint of production efficiency, the upper limit thereof is preferably 100 pieces or less, more preferably 50 pieces or less, still more preferably 20 pieces or less. By arranging the supports 3 in such a number, the convex portions 1P and the concave portions 1R can be uniformly formed on the entire wiping sheet 1, and as a result, the dust collection property is further improved. be able to. Further, the design of the wiping sheet 1 caused by the convex portion 1P and the concave portion 1R can be enhanced.

From the viewpoint of achieving both the entanglement of the fiber aggregate 2 and the support 3 and the strength of the wiping sheet 1, the wire diameter L1 of the support 3 (see FIG. 1B) is entangled with the fiber aggregate 2. It can be appropriately adjusted depending on the degree of degree, but it is preferably 10 μm or more, more preferably 50 μm or more, more preferably 2000 μm or less, still more preferably 1000 μm or less. The wire diameter L1 may be partially different in one support, and may be the same or different among the respective supports 3. In this case, the wire diameter L1 is the average value of the wire diameters of the supports.

In the wiping sheet 1, the fiber aggregate 2 may be used as it is (so-called dry mode) at the time of wiping, and the fiber aggregate 2 is coated, sprayed, supported or impregnated with a cleaning liquid (so-called wet mode). ) May be used. 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 efficiency of removing stains on the surface to be wiped, it is preferable that the cleaning liquid is supported on the fiber aggregate constituting the wiping sheet.

When the wiping sheet is used in a wet mode at the time of wiping, the cleaning liquid supported on the sheet should be water alone or an aqueous solution containing an additive, which has a general composition used for a wet wiping sheet. Can be done. Examples of the additive used in the cleaning liquid include surfactants, bactericides, fragrances, fragrances, deodorants, pH adjusters, alcohols and abrasive particles.

The above has been described with respect to one embodiment of the wiping sheet of the present invention, and the manufacturing apparatus 10 suitably used for manufacturing the wiping sheet will be described below. The manufacturing apparatus 10 shown in FIG. 2 includes a web forming portion 20, a water flow entanglement portion 30, and a heating portion 40 in this order along the transport direction (X direction).

The web forming portion 20 includes card machines 21A and 21B for producing fiber webs 21a and 21b for forming fiber aggregates, guide rolls 23 for the fiber webs 21a and 21b, and a plurality of support strands 3a. It is provided with a support roll 25 for feeding out. The support strand 3a is composed of heat-shrinkable strands.

The water flow entanglement portion 30 entangles the fiber webs 21a and 21b and the support strand 3a by a water flow to form an entangled body 5 in which the fiber aggregate and the support are integrally entangled. The water flow entanglement portion 30 includes a water flow nozzle 35 that blows a water flow onto the fiber web 21a side, and a support belt 36 made of an endless belt. The water flow nozzle 35 is located above the support belt 36, and is capable of spraying a high-pressure water flow over the entire width direction (direction orthogonal to the transport direction) of the fiber webs 21a and 21b and the support 3. .. The support belt 36 is arranged so as to face the water flow nozzle 35, and has a structure in which holes are formed in various patterns such as a grid pattern in order to allow the sprayed water to pass through (not shown).

The heating portion 40 heats the entangled body 5 formed by the water flow entangled portion 30 to heat-shrink the support 3, and forms a ridge portion and a concave portion in the entangled body 5. The heating unit 40 is provided with a heating device 41 so that the entangled body 5 can be conveyed inside the heating device 41. The heating mode of the heating device 41 is not particularly limited, and the entangled body 5 can be heated by, for example, a heater, blowing hot air, or irradiating infrared rays.

The method for manufacturing the wiping sheet using the manufacturing apparatus 10 shown in FIG. 2 is as described below. In this manufacturing method, a laminating step of laminating a fiber web and a support strand for forming a fiber aggregate and an entanglement of the fiber web to form a fiber aggregate, and the fiber aggregate and the support are formed. It is roughly divided into three steps: an entanglement process in which the strands for entwining are entangled to form an entangled body, and a heating process in which the strands for a support are heat-shrinked to form convex portions and concave portions in the entangled body. To.

First, the fiber webs 21a and 21b are unwound from the card machines 21A and 21B in the web forming unit 20 via the guide rolls 23 and 23, respectively. At the same time, a plurality of support strands 3a are unfolded from the support roll 25 in a non-crossing state. By these feedings, the laminated body 4 in which the fiber webs 21a and 21b and the support strands 3a are laminated is formed (lamination step). In this step, the support strand 3a is unwound so that the extending direction X of the support strand 3a and the transport direction X coincide with each other.

Next, in the water flow entanglement portion 30, the laminated body 4 is entangled by the high-pressure water flow ejected from the water flow nozzle 35 while being conveyed by the support belt 36 (entanglement step). By going through the entanglement step, the constituent fibers of the fiber webs 21a and 21b constituting the laminated body 4 are entangled with each other to form the fiber aggregate 2, and the fiber aggregate 2 and the support strand 3a are integrated. An entangled body 5 in a entangled state is obtained. As shown in FIG. 3, the support strands 3a in the entangled body 5 are continuously arranged so as to be interrupted along the X direction.

From the viewpoint of effectively entwining the fiber aggregate 2 and the support 3, as shown in FIG. 4, the support strand 3a is one or more extending in a direction intersecting the X direction, which is the extending direction thereof. It is preferable to have a branch portion 3'of the book. The branch portions 3'in the adjacent support strands 3a are not connected to each other. In order to manufacture an entangled body 5 having a support strand 3a having a branch portion 3', for example, (a) X a continuous support strand 3a having a plurality of branch portions 3'. The laminated body 4 is formed by feeding out along the direction and then entangled, or (b) the laminated body 4 is formed by using the reticulated support strand 3a, and before or after the entanglement step. It can be manufactured by cutting a portion of the net-like support strand 3a extending in the Y direction with a cutting means such as a cutter. Since the branch portion 3'is substantially the same as the support strand 3a, the description regarding the support strand 3a is appropriately applied. Further, as will be described later, since the support strand 3a is heat-shrinked to change it into the support 3, the support 3 also extends in the direction intersecting the X direction, like the support strand 3a. Alternatively, it will have a plurality of branch portions 3'.

When the entangled body 5 is formed, the entangled body 5 is passed through the heating device 41 in the heating unit 40, and the support strand 3a is heat-shrinked in the heating device 41 to form a fiber aggregate. The ridges and ridges are formed (heating step). Specifically, when the entangled body 5 shown in FIG. 5A is heated, the support strand 3a contracts along its extending direction X. Due to the entanglement of the fiber aggregate 2 and the support 3, friction is likely to occur between the fiber aggregate 2 and the support strand 3a, so that the heat shrinkage of the support strand 3a causes the friction. The width of the fiber aggregate 2 is narrowed. However, since there is no change in the volume of the fiber aggregate 2 before and after the thermal shrinkage of the support strand 3a, the change in volume due to the narrowing of the width of the fiber aggregate 2 increases the thickness of the fiber aggregate 2. It is offset by that. As a result, as shown in FIG. 5B, the convex portions 1P and the concave portions 1R are alternately generated in the extending direction X of the support strand 3a in the fiber aggregate 2, and the thickness of the fiber aggregate 2 is increased. Will increase. As a result, the convex portions 1P and the concave portions 1R are alternately generated in the entire area of the fiber aggregate 2.

Due to the heat shrinkage of the support strand 3a, the support strand 3a is transformed into the support 3. Since the length and thickness of the support strand 3a only change when heat is applied to the support strand 3a, the distance between the adjacent support strands 3a changes with the support strand 3a. It is substantially the same as the distance between the supports 3.

In the heating step, the heat shrinkage temperature of the support strand 3a can be appropriately changed depending on the raw materials of the fiber aggregate 2 and the support strand 3a, but the melting point MP (° C.) of the support strand 3a is used as a reference. It is preferably (MP-30) ° C. or higher, more preferably (MP-20) ° C. or higher, and from the viewpoint of preventing melting or decomposition of the raw material of the support strand 3a, (MP-5) ° C. It is preferably the following, and more preferably (MP-10) ° C. or lower. In the heating process. From the viewpoint of preventing melting and decomposition of the constituent fibers of the fiber aggregate 2, the melting point and decomposition temperature of the fibers constituting the fiber aggregate 2 are preferably equal to or higher than the melting point MP of the support strand 3a. Further, the heat shrinkage time of the support strand 3a can be 1 minute or more and 60 minutes or less.

Finally, the manufactured wiping sheet 1 may be used as it is as a dry wiping sheet, or the cleaning liquid may be supported on the fiber aggregate 2 in the wiping sheet 1 (supporting step) and used as a wet wiping sheet. can. In the step of supporting the cleaning liquid, the amount of the cleaning liquid supported on the fiber aggregate 2 is preferably 1 g / sheet or more when the dimensions of the wiping sheet 1 are, for example, 285 mm × 205 mm 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, preferably 17 g / ^{m 2} or more, more preferably 117 g / ^{m 2} or more, preferably 690 g / ^{m 2} or less, more preferably 430 g / ^{m 2} or less.

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.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 to 12. The description of the embodiment shown in FIGS. 1 to 5 is appropriately applied to the points not particularly described with respect to the embodiment shown in FIGS. 6 to 12. Further, in FIGS. 6 to 12, the same members as those in FIGS. 1 to 5 are designated by the same reference numerals.

The wiping sheet 1 of the embodiment shown in FIG. 6 has a plurality of uneven portions 11 having at least one ridge portion 1P and at least one ridge portion 1P. The uneven portion group 11 is composed of the fiber aggregate 2. The uneven portion group 11 extends linearly along the Y direction of the wiping sheet 1. In the uneven portion group 11, the first surface 1a and the second surface 1b of the wiping sheet 1 have a complementary shape. The convex portion 1P and the concave portion 1R are formed on the first surface 1a, while the convex portion 1P'and the concave portion 1R'are formed on the second surface 1b.

The uneven portion group 11 extends along the Y direction of the wiping sheet 1. The wiping sheet 1 has a flat surface portion 12 between adjacent uneven portions 11. The flat surface portion 12 is composed of the fiber aggregate 2 like the uneven portion group 11. The flat surface portion 12 and the uneven portion group 11 are integrally formed. In the plan view of the wiping sheet 1, the flat surface portion 12 has a substantially rectangular shape. The flat surface portion 12 is a flat region having no unevenness. On the first surface 1a of the wiping sheet 1, the convex portion 1P protrudes from the flat surface portion 12, and the concave portion 1R is recessed from the flat surface portion 12. On the other hand, in the second surface 1b of the wiping sheet 1, the convex portion 1P'projects from the flat surface portion 12 and the concave portion 1R'is recessed from the flat surface portion 12.

In the wiping sheet 1 shown in FIG. 6, a plurality of short supports 3 are arranged in series at intervals in the extending direction thereof to form a support row 31. The support rows 31 are arranged in a plurality of rows at intervals in the Y direction of the wiping sheet 1. The supports 3 constituting one support row 31 may have the same length or may have different lengths. FIG. 6 shows a state in which a plurality of support rows 31 composed of a plurality of supports 3 having the same length are arranged at equal intervals.

In the support row 31 of a plurality of rows, when focusing on one support row 31, the positions of the two ends of each support constituting the support row 31 are different from each other adjacent to the support row 31. It coincides with the positions of the two ends of each support constituting the support row 31 in the X direction. Specifically, as shown in FIG. 7, each support constituting the first support row 31a is 32a, 33a, 34a, ..., And each support constituting the second support row 31b is 32b, 33b. , 34b, ..., The positions of the two ends 321a, 322a of the support 32a in the first support row 31a are the two ends 321b, 322b of the support 32b in the second support row 31b. It coincides with the position of in the X direction. This relationship also holds for the other supports 33a and 33b and 34a and 34b. Therefore, when the wiping sheet 1 is viewed in a plan view and viewed along the X direction, the support non-existing region 12a, which is a region in which the support does not exist, exists intermittently along the X direction. The support non-existing region 12a corresponds to the above-mentioned flat surface portion 12. On the other hand, the region where the support 3 exists corresponds to the above-mentioned uneven portion group 11.

According to the present embodiment, in addition to the effect of the wiping sheet 1 shown in FIGS. 1 to 5, the number of planes where the sheet comes into contact with the floor increases, so that dust having a small particle size can be wiped off. The effect is also played. From the viewpoint of making this effect more remarkable, the length of the flat surface portion 12 along the X direction is preferably 5 mm or more, more preferably 10 mm or more, preferably 50 mm or less, and 30 mm or less. Is more preferable.

From the same viewpoint, the value of 11L / 12L, which is the ratio of the length 11L of the uneven portion group 11 to the length 12L of the flat surface portion 12 along the X direction, is preferably 0.01 or more, preferably 0.1 or more. It is more preferably 1 or less, and further preferably 0.5 or less.

The wiping sheet 1 of the present embodiment can be manufactured by the same method as the manufacturing method of the wiping sheet 1 described above. However, in the method for manufacturing the wiping sheet 1 of the present embodiment, instead of manufacturing the entangled body 5 shown in FIG. 3 described above, the entangled body 5 shown in FIG. 8 is manufactured. In the entangled body 5 shown in FIG. 8, a plurality of short support strands 3a are arranged in series at intervals in the extending direction thereof to form a strand row 31'. A plurality of strand rows 31'are arranged at intervals in the Y direction of the entangled body 5. In the plurality of rows of strand rows 31', when focusing on one strand row 31', the positions of the two ends of each support strand 3a constituting the strand row 31'are set to the strand row 31'. It coincides with the position of the two ends of each support strand 3a constituting another adjacent strand row 31'in the X direction.

A cross section of the entangled body 5 shown in FIG. 8 along the X direction is shown in FIG. 9 (a). When the entangled body 5 in the state shown in the figure is heated, the support strand 3a is thermally contracted, and the width of the fiber aggregate 2 existing in the portion is narrowed. As a result, as shown in FIG. 9B, unevenness having the convex portions 1P, 1P'and the concave portions 1R, 1R'only in the portion where the fiber aggregate 2 and the support strand 3a are entangled. Group 11 is formed. On the other hand, in the portion where the support strand 3a does not exist, the width of the fiber aggregate 2 is not narrowed, so that the uneven portion group 11 is not formed and does not substantially change from the state before heating. As a result, the portion becomes a flat surface portion 12.

In the entangled body 5 shown in FIG. 8, the length D2 of the support strand 3a (see FIG. 8) is the effective formation of the convex portions 1P, 1P'and the concave portions 1R, 1R', and the wiping sheet. From the viewpoint of achieving both the strength of 10 mm or more, it is more preferably 20 mm or more, more preferably 100 mm or less, and further preferably 50 mm or less. From the same viewpoint, the distance D3 between the front and rear adjacent support strands 3a in one strand row 31'is preferably 1 mm or more, more preferably 5 mm or more, and more preferably 100 mm or less. It is more preferably 50 mm or less. Further, the value of D3 / D2, which is the ratio of D3 to D2, is preferably 0.1 or more, more preferably 0.25 or more, preferably 5 or less, and preferably 3 or less. More preferred.

Similar to the wiping sheet 1 of the embodiment shown in FIG. 6, the wiping sheet 1 of the embodiment shown in FIG. 10 has a plurality of uneven portions 11 having at least one ridge portion 1P and at least one ridge portion 1P. is doing. In FIG. 10, on the first surface 1a of the wiping sheet 1, one uneven portion group 11 is composed of two convex strips 1P and a single concave strip 1R located between them. Although not shown, in the uneven portion group 11, the first surface 1a and the second surface 1b of the wiping sheet 1 have a complementary shape. Therefore, on the second surface, one uneven portion group is composed of two concave portions and one convex portion located between them. The uneven portion group 11 is composed of the fiber aggregate 2.

The uneven portion group 11 extends in a corrugated manner along the Y direction of the wiping sheet 1. When focusing on one uneven portion group 11, in the uneven portion group 11, the top portion 11a and the bottom portion 11b are alternately located along the Y direction. Then, in the two concavo-convex portions 11 adjacent to each other, the concavo-convex portions 11 are arranged so that the top portion 11a of one concavo-convex portion group 11 and the bottom portion 11b of the other concavo-convex portion group 11 are in contact with each other. As a result, the region 12 defined by the two adjacent uneven portions 11 is formed. This region 12 is a flat surface portion. The flat surface portion 12 is composed of the fiber aggregate 2 like the uneven portion group 11. The flat surface portion 12 and the uneven portion group 11 are integrally formed. In the plan view of the wiping sheet 1, the flat surface portion 12 has a substantially spindle shape extending in the Y direction. The flat surface portion 12 is a flat region having no unevenness. On the first surface 1a of the wiping sheet 1, the convex portion 1P protrudes from the flat surface portion 12, and the concave portion 1R is recessed from the flat surface portion 12. On the other hand, although not shown, on the second surface 1b of the wiping sheet 1, the convex portion 1P'projects from the flat surface portion 12 and the concave portion 1R'is recessed from the flat surface portion 12.

In the wiping sheet 1 shown in FIG. 10, a plurality of short supports 3 are arranged in series at intervals in the extending direction thereof to form a support row 31. The support rows 31 are arranged in a plurality of rows at intervals in the Y direction of the wiping sheet 1. The supports 3 constituting one support row 31 may have the same length or may have different lengths. Further, the distances between the support rows 31 may be the same or different. FIG. 10 shows a state in which a plurality of support rows 31 composed of a plurality of supports 3 having the same length are arranged at equal intervals.

In the support row 31 of a plurality of rows, when focusing on one support row 31, the positions of the two ends of each support constituting the support row 31 are different from each other adjacent to the support row 31. The positions of the two ends of each support constituting the support row 31 of the above are deviated from each other in the X direction. Specifically, as shown in FIG. 11, each support constituting the first support row 31a is 32a, 33a, 34a, ..., And each support constituting the second support row 31b is 32b, 33b. , 34b, ..., And when each support constituting the third support row 31c is 32c, 33c, 34c, ..., The two ends 321b of the support 32b in the second support row 31b. , 322b are displaced in the X direction from the positions of the two ends 321a and 322a of the support 32a in the first support row 31a, and the two ends of the support 32c in the third support row 31c. It deviates from the positions of 321c and 322c in the X direction. In addition to this, the positions of the two ends 321a, 322a of the support 32a in the first support row 31a are the positions of the two ends 321c, 322c of the support 32c in the third support row 31c and the X direction. Are in agreement. This relationship also holds for other supports 33a, 33b, 33c and 34a, 34b, 34c. Therefore, when the wiping sheet 1 is viewed in a plan view, all the supports 3 are arranged in a houndstooth pattern. The support 3 is present at a position where the top portion 11a of one uneven portion group 11 and the bottom portion 11b of another uneven portion group 11 adjacent to the uneven portion group 11 are in contact with each other. Further, the region between the front and rear adjacent supports in one support row corresponds to the above-mentioned flat surface portion 12.

According to the present embodiment, in addition to the effect of the wiping sheet 1 shown in FIGS. 1 to 5, the orientation direction of the constituent fibers changes along the curves of the convex and concave portions, and the end portions of the fibers are changed. Since it faces in various directions, it also has the effect of making it easier to entangle thread-like dust. From the viewpoint of making this effect more remarkable, the maximum length of the flat surface portion 12 along the X direction is preferably 3 mm or more, more preferably 5 mm or more, preferably 30 mm or less, and preferably 20 mm. The following is more preferable. On the other hand, the maximum length of the flat surface portion 12 along the Y direction is preferably 3 mm or more, more preferably 5 mm or more, preferably 30 mm or less, and further preferably 20 mm or less.

From the same viewpoint, the value of 11L / 12L, which is the ratio of the maximum length 11L of the flat surface portion 12 along the Y direction to the maximum length 12L of the flat surface portion 12 along the X direction, is preferably 0.01 or more. , 0.1 or more, more preferably 5 or less, and even more preferably 1 or less.

The wiping sheet 1 of the present embodiment can be manufactured by the same method as the manufacturing method of the wiping sheet 1 shown in FIG. However, in the method for manufacturing the wiping sheet 1 of the present embodiment, instead of manufacturing the entangled body 5 shown in FIG. 8 described above, the entangled body 5 shown in FIG. 12 is manufactured. In the entangled body 5 shown in FIG. 12, the strands 3a for each support are arranged in a houndstooth pattern when the entangled body 5 is viewed in a plan view.

In the entangled body 5 shown in FIG. 12, the length D2 of the support strand 3a (see FIG. 12) is the effective formation of the convex portions 1P, 1P'and the concave portions 1R, 1R', and the wiping sheet. From the viewpoint of achieving both the strength of 10 mm or more, it is more preferably 15 mm or more, more preferably 100 mm or less, and further preferably 50 mm or less. From the same viewpoint, the distance D3 (see FIG. 12) between the front and rear supporting strands 3a is preferably 1 mm or more, more preferably 5 mm or more, preferably 100 mm or less, and 50 mm or less. Is more preferable. Further, the value of D3 / D2, which is the ratio of D3 to D2, is preferably 0.1 or more, more preferably 0.25 or more, preferably 5 or less, and preferably 3 or less. More preferred.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above embodiment. In the above-mentioned production method, two fiber webs and a support are used to form an entanglement, but instead, one fiber web and a support may be used to form an entanglement.

Further, the branch portion 3'shown in FIG. 4 may be applied to the support in the wiping sheet 1 of the embodiment shown in FIGS. 6 and / or 10.

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]
Using the apparatus shown in FIG. 2, a wiping sheet was manufactured according to the manufacturing method described above. A fiber web composed of three types of staple fibers (fiber length 51 mm) containing PET: acrylic: rayon = 7: 1.5: 1.5 in a mass ratio as a fiber aggregate was produced by a card machine. The average fiber diameter of PET was 1.45 dtex, the average fiber diameter of acrylic was 1.0 dtex, and the average fiber diameter of rayon was 1.7 dtex. None of these fibers shrink and stretch due to the heat that causes the support strands to shrink. The basis weight of the fiber aggregate was 60 g / m ² . As the strand for the support, one made of polypropylene having heat shrinkage was used. In the entangled body 5, as shown in FIG. 3, 32 support strands are arranged at equal intervals along the Y direction so as to extend continuously along the X direction of the sheet. The obtained wiping sheet was rectangular, and its dimensions were 285 mm × 205 mm. In the wiping sheet, the constituent fibers were oriented in the thickness direction.

[Example 2]
A wiping sheet was obtained in the same manner as in Example 1 except that 18 support strands were arranged at equal intervals along the Y direction.

[Example 3]
A wiping sheet was obtained in the same manner as in Example 1 except that the support strands were intermittently arranged as shown in FIG. 8 instead of the support arrangement form shown in FIG. The length D2 of the support strand was set to 40 mm. The distance D3 between adjacent support strands in the X direction was set to 20 mm.

[Example 4]
A wiping sheet was obtained in the same manner as in Example 1, except that the support strands were arranged in a houndstooth pattern so as to be offset by half a pitch, as shown in FIG. 12, instead of the support arrangement form shown in FIG. rice field. The length D2 of the support strand was set to 20 mm. The distance D3 between adjacent support strands in the X direction was set to 20 mm.

[Comparative Example 1]
A wiping sheet was obtained in the same manner as in Example 1 except that the wiping sheet was not heated. The sheet of this comparative example had no convex or concave portions.

[Evaluation of dust collection performance]
The dust collection performance of the wiping sheets of Examples and Comparative Examples was evaluated. Specifically, 7 types of test powder (medium particle size: 27) specified in JIS Z 8901 are attached to a flooring (combit new advance 101, manufactured by Wood One Co., Ltd.) having a length (cleaning direction) of 90 cm and a width of 90 cm. ~ 31 μm) was 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. 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. The change in the sheet mass before and after wiping was measured, and the dust collection rate (%) was calculated from the following formula.

Dust collection rate (%) = 100 × ((mass of wiping sheet after wiping [g])-(mass of wiping sheet before wiping [g])) /0.1 [g])

[Strength of wiping sheet]
The tensile strength was measured for the wiping sheets of Examples and Comparative Examples. Specifically, when a sample having a width of 30 mm and a length of 150 mm is pulled at a span of 100 mm and a speed of 300 mm / min using a tensile strength tester (manufactured by Shimadzu Corporation, AG-IS 100N), the sample breaks. The maximum load value (N) up to this point was measured. This measurement was performed in the X direction (MD direction) of the sample and the Y direction (CD direction) orthogonal to the MD direction, respectively, and the tensile strength (N / 30 mm) in each direction was taken. The results are shown in Table 1.

As shown in FIG. 13, the wiping sheet of Examples 1 to 4 having a ridge portion and a concave portion catches dust as compared with the wiping sheet of Comparative Example 1 having no ridge portion and a concave portion. It can be seen that the collection performance is high. Further, the wiping sheets of Examples 1 to 4 can be used without breaking during wiping, and have tensile strength as shown in Table 1, so that it can be seen that they have strength that can withstand practical use. ..
As described above, it can be seen that the wiping sheet of the present invention is excellent in dust collecting property without reducing the degree of freedom of the constituent fibers of the sheet.

1 Wiping sheet 2 Fiber aggregate 3 Support 3'Branch 3a Support strand 4 Laminate 5 Entanglement 10 Manufacturing equipment 20 Web forming part 30 Water flow entanglement part 40 Heating part X Extension direction (transport direction)
Y width direction Z thickness direction

Claims (4)

A wiping sheet comprising a fiber aggregate and a plurality of strand-like and non-stretchable supports that support the fiber aggregate, and the fiber aggregate and the support form an integral entangled state. And
A plurality of the supports extend in one direction and do not intersect with other supports.
A plurality of the supports are arranged in series at intervals in the extending direction to form a support row, and the supports rows are arranged in a plurality of rows at intervals in a direction intersecting the one direction. The supports are arranged in a houndstooth pattern in the plan view of the wiping sheet.
Convex portions and concave portions that are composed of the fiber aggregate and extend in a direction intersecting the one direction are alternately provided in the one direction .
In a plan view, a plurality of uneven portions having at least one convex portion and at least one concave portion are formed while meandering in a waveform in a direction intersecting the one direction.
In a plan view, the two adjacent uneven portions are arranged so that the top of one of the uneven portions and the bottom of the other uneven portion are in contact with each other.
The area defined by the two adjacent uneven parts is flat.
In a plan view, the support is a wiping sheet located at a position where the top portion of one uneven portion group and the bottom portion of an uneven portion group adjacent to the uneven portion group are in contact with each other. The wiping sheet according to claim 1 , wherein the support has one or a plurality of branches extending in a direction intersecting the one direction. The wiping sheet according to any one of claims 1 or 2 , wherein the constituent fibers of the fiber aggregate are oriented in the thickness direction of the wiping sheet. The wiping sheet according to any one of claims 1 to 3 , wherein the cleaning liquid is supported on the fiber aggregate.

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