WO2016104061A1

WO2016104061A1 - Cleaning sheet

Info

Publication number: WO2016104061A1
Application number: PCT/JP2015/083628
Authority: WO
Inventors: 大崎　雅之
Original assignee: 花王株式会社
Priority date: 2014-12-22
Filing date: 2015-11-30
Publication date: 2016-06-30
Also published as: JP6198803B2; SG11201704341QA; TW201623722A; CN106998986B; CN106998986A; TWI646232B; JP2016116851A; MY178253A

Abstract

This cleaning sheet (1) comprises a laminate of a liquid holding layer (4) and an airlaid layer (5) disposed on one side of the liquid holding layer (4). The airlaid layer (5) includes large-diameter fibers (2) having a denier of 10 to 150 dtex and small-diameter fibers having a denier of 0.5 to 5 dtex. A plurality of tips of large-diameter fibers (2) are present on the surface of the airlaid layer (5) and provide abrasiveness and scraping properties against soil on a surface to be cleaned. Also, a plurality of tips of large-diameter fibers (2) are present on the surface of the liquid holding layer (4) opposite to the surface facing the airlaid layer (5), and the number thereof is less than the number of tips of large-diameter fibers (2) present on the surface of the airlaid layer (5).

Description

Cleaning sheet

The present invention relates to a cleaning sheet.

The present applicant has previously included 10 to 90% by mass of a thermoplastic fiber having a fiber length of 2 to 15 mm and a fineness of 10 to 150 dtex and 10 to 90% by mass of a cellulosic fiber, and the thermoplastic fiber is formed on the surface. There has been proposed a cleaning sheet having a large number of leading end portions and having an abrasive property or a scraping property against dirt existing on the surface to be cleaned (Patent Document 1). This cleaning sheet has a feature that it has sufficient abrasiveness or scraping property against dirt.

As another cleaning article having an abrasive property against dirt, Patent Document 2 discloses a polishing comprising a substrate, a water-soluble binder, and a plurality of abrasive particles fixed to the substrate by the water-soluble binder in a peelable manner. Cleaning articles have been proposed. In this abrasive cleaning article, the abrasive particles are peeled off from the substrate when they come into contact with the solvent.

JP 2003-61885 A Special table 2008-529589 gazette

The cleaning sheet described in Patent Document 1 has a single scraping performance because only one surface of the sheet is a dirt scraping surface. Therefore, the scraping performance cannot be changed according to the degree of dirt sticking. Also, when using a sheet, a scraping operation is performed by placing a hand on a flat surface opposite to the scraping surface. May slip, making it difficult to perform the scraping operation.

In the abrasive cleaning article described in Patent Document 2, when the article comes into contact with the solvent and the water-soluble binder dissolves, the abrasive particles are peeled off from the article, and dirt is removed using the hardness of the peeled abrasive particles. The use of abrasive particles is essential. Therefore, it is not possible to expect the dirt removal performance of the sheet alone. Further, the abrasive cleaning article described in the same document is indispensable for use in a wet state because abrasive particles are not released from the article in the dry state. Even when it is used in a wet process, the abrasive particles are peeled after the water-soluble binder is dissolved in the solvent, so that it takes time until the abrasive particles are peeled off.

The present invention provides a cleaning sheet having a liquid holding layer containing cellulosic fibers and a heat-fusible fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm, and an airlaid layer laminated on one side thereof. There,
The airlaid layer includes thermoplastic fibers, and the intersections of the constituent fibers are fused or bonded,
The airlaid layer includes a large-diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a small-diameter thermoplastic fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm,
A plurality of tip portions of the large-diameter thermoplastic fiber are present on the surface of the airlaid layer, and have a polishing property or a scraping property for dirt existing on the surface to be cleaned,
A plurality of tip portions of the large-diameter thermoplastic fiber are also present on the surface of the liquid retaining layer opposite to the surface facing the airlaid layer, and the number of the present portions is present on the surface of the airlaid layer. The present invention provides a cleaning sheet that is less than the number of the tip portions of the large-diameter thermoplastic fibers.

FIG. 1 is a perspective view schematically showing an embodiment of the cleaning sheet of the present invention. FIG. 2 is a schematic diagram showing a cross-sectional structure of the cleaning sheet shown in FIG. FIG. 3 is an enlarged schematic view showing the main part of the cross-sectional structure shown in FIG. FIG. 4 is a schematic diagram showing a dirt removal mechanism by the cleaning sheet shown in FIG. FIG. 5 is a schematic view showing an apparatus suitably used for manufacturing the cleaning sheet shown in FIG. Fig.6 (a) is a schematic diagram which shows the cross-section of another embodiment of the cleaning sheet | seat of this invention, FIG.6 (b) expands the principal part of the cross-section shown in Fig.6 (a). It is a schematic diagram shown.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The cleaning sheet 1 of the embodiment shown in FIGS. 1 and 2 is suitably used for cleaning hard surfaces. The cleaning sheet 1 is of a dry type and does not substantially contain a liquid component such as a cleaning liquid. “Substantially not contained” means that the ratio of the liquid component in the cleaning sheet 1 is 3% by mass or less. The cleaning sheet 1 has a liquid holding layer 4 and an airlaid layer 5. That is, the cleaning sheet 1 has a two-layer structure including the liquid holding layer 4 and the airlaid layer 5. Therefore, no other layer is interposed between the liquid holding layer 4 and the airlaid 5. However, this does not prevent the interposition of another layer between the liquid holding layer 4 and the airlaid layer 5, and the liquid holding layer 4 depends on the specific use of the cleaning sheet 1. Another layer may be interposed between the airlaid layer 5 and the airlaid layer 5. The liquid holding layer 4 and the airlaid layer 5 are laminated and integrated. As the means for integration, various means such as fusion, adhesion using an adhesive, and sewing can be employed.

Since the cleaning sheet 1 has a two-layer structure including the liquid holding layer 4 and the airlaid layer 5, the cleaning sheet 1 has one surface constituted by the surface of the liquid holding layer 4, and the other side. These surfaces are constituted by the surface of the airlaid layer 5.

The liquid holding layer 4 is a layer capable of absorbing and holding moisture. On the other hand, the airlaid layer 5 is a layer having a scraping performance against dirt. In this sense, the airlaid layer is also referred to as “scraping layer” in the following description. The liquid holding layer 4 includes cellulosic fibers and heat-fusible fibers having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm. The airlaid layer 5 includes thermoplastic fibers and is a layer in which intersections of constituent fibers in a web formed by the airlay method are bonded by a fusion or a binder.

The cleaning sheet 1 may have an uneven structure on the surface of the scraping layer 5. For example, as shown in FIG. 1, the rhombic lattice-shaped recesses 8 may be formed on the surface of the scraping layer 5 by applying a rhombus lattice-shaped heat embossing process. The recessed part 8 consists of a fusion | melting part whose density is higher than the periphery. The region taken in by the rhombic lattice-shaped recesses 8 is a non-embossed region composed of the protrusions 7. The non-embossed region is composed of a non-fused portion having a density lower than that of the concave portion. The concave portion 8 is more consolidated than the non-embossed region formed by the convex portion 7 by application of heat and pressure by heat embossing. That is, the concave portion 8 has a higher density than the non-embossed region. This heat embossing can be used to join the scraping layer 5 and the liquid holding layer 4 in addition to forming irregularities on the surface of the scraping layer 5.

The pattern shape of the concave portion 8 is not limited to a rhombus lattice shape, and an arbitrary shape such as a line shape, a dot shape, or a specific pattern can be adopted. The total area of the recesses 8 is preferably 5% or more, particularly 10% or more with respect to the area of the cleaning surface of the cleaning sheet 1. Further, it is preferably 50% or less, particularly 40% or less. Specifically, the total area of the recesses 8 is preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less with respect to the area of the cleaning surface of the cleaning sheet 1. This value is referred to as the area ratio of the recess 8). By setting the area ratio of the concave portion 8 within this range, it is possible to successfully achieve both surface strength and cleanability during cleaning.

The cleaning sheet 1 may have perforations (not shown). By cutting the cleaning sheet 1 along the perforations, the cleaning sheet 1 can be subdivided into a size that is easy to use. As long as the cleaning sheet 1 can be subdivided into an easy-to-use size and shape, the perforated pattern shape is not particularly limited.

The scraping layer 5 which is one layer constituting the cleaning sheet 1 includes a large-diameter thermoplastic fiber (hereinafter also referred to as “large-diameter fiber”) 2 as a kind of the above-described thermoplastic fiber. In the present invention, the large-diameter fiber 2 refers to a fiber having a fineness of 10 dtex or more and 150 dtex or less. A fiber having such a large fineness has a sufficiently high scraping property against dirt because the rigidity of the fiber is high. From this viewpoint, the fineness of the large-diameter fiber 2 is preferably 10 dtex or more, particularly 20 dtex or more, and particularly preferably 30 dtex or more. Moreover, it is preferable that it is 150 dtex or less, especially 130 dtex or less, especially 120 dtex or less. Specifically, as described above, the fineness of the thick fiber 2 is preferably 10 dtex or more and 150 dtex or less, more preferably 20 dtex or more and 130 dtex or less, and further preferably 30 dtex or more and 120 dtex or less. By adopting the large-diameter fibers 2 having a fineness in this range, the cleaning sheet 1 becomes more excellent in scraping off dirt adhered to, for example, a pot or a frying pan, and dirt adhered around a kitchen or water. The cleaning sheet 1 has a plurality of tip portions of the large-diameter fibers 2 on the surface of the scraping layer 5, and exhibits an abrasive property or a scraping property against dirt existing on the surface to be cleaned.

It is also preferable that the large diameter fiber 2 is a short fiber. As a result, the large-diameter fibers 2 are less likely to bend, which also improves the rigidity. Further, by using short fibers as the large diameter fibers 2, the scraping layer 5 can be successfully formed by the air array method as described later. From these viewpoints, the fiber length of the large-diameter fiber 2 is preferably 2 mm or more, more preferably 3 mm or more, and further preferably 4 mm or more. Further, it is preferably 15 mm or less, more preferably 8 mm or less, and further preferably 6 mm or less. Specifically, the fiber length of the thick fiber 2 is preferably 2 mm or more and 15 mm or less, more preferably 3 mm or more and 8 mm or less, and further preferably 4 mm or more and 6 mm or less. By employing a fiber length in this range, the rigidity of the thick fiber 2 can be sufficiently increased. In addition, it is possible to effectively prevent the large-diameter fibers 2 from falling off the scraping layer 5. Furthermore, the scraping layer 5 can be successfully formed by the air array method.

It is preferable that the large-diameter fiber 2 is contained in the cleaning sheet 1 in an amount of 10% by mass or more from the viewpoint of exhibiting sufficient scraping performance against dirt. The scraping performance is further enhanced when the ratio of the large-diameter fibers 2 in the cleaning sheet 1 is 30% by mass or more, particularly 50% by mass or more. The ratio of the large diameter fibers 2 in the cleaning sheet 1 is preferably 90% by mass or less. Specifically, the proportion of the large-diameter fibers 2 in the cleaning sheet 1 is more preferably 10% by mass or more and 90% by mass or less, further preferably 30% by mass or more and 90% by mass or less, and 50% by mass. % To 90% by mass is even more preferable.

Examples of the large-diameter fiber 2 include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polyacrylic acid and polymethacrylic acid, vinyl resins such as polyvinyl chloride, and nylon. Fibers made from polyamide resin, various metals, glass, minerals, etc. are used. When the resin-made large-diameter fibers 2 are used, the resin hardness is preferably in the range of R40 to R150 in terms of Rockwell hardness. In particular, it is preferable to use R80 to R150 resins from the viewpoint of improving the dirt scraping property. Of the various raw materials, a composite fiber (core-sheath type composite fiber or side-by-side type composite fiber) made of a combination of two kinds of resins can be used. Especially as the large-diameter fibers 2, acrylic fibers, polyester fibers, vinyl chloride fibers, polyamides that have no damage to the surface to be cleaned (stainless steel, tiles, tiles, artificial marble, etc.) and have excellent scraping properties Fibers and polyolefin fibers are preferred. Furthermore, it is also preferable to use heat-fusible fibers from the viewpoint of preventing the fibers from falling off. As the heat-fusible fiber, for example, a heat-fusible composite fiber composed of a low-melting resin and a high-melting fiber having different melting points, and the low-melting resin forming at least a part of the fiber surface is used. Is preferred. Low melting point resin / high melting point resin combinations include high density polyethylene / polypropylene, low density polyethylene / polypropylene, polypropylene / ethylene butene-1 crystalline copolymer, high density polyethylene / polyethylene terephthalate, nylon-6 / nylon- 66, low melting point polyester / polyethylene terephthalate, polypropylene / polyethylene terephthalate, and the like.

The form of the heat-fusible conjugate fiber is a parallel type, a sheath core type, an eccentric sheath core type, a multi-layer type of three or more layers, a hollow parallel type, a middle sheath core type, a deformed sheath core type, a sea island type, and the like. Any structure may be used as long as the melting point resin forms at least a part of the fiber surface. Among the heat-fusible conjugate fibers, preferred are low-melting point polyesters such as high-density polyethylene, linear low-density polyethylene, ethylene / butylene-1 crystalline copolymer, and copolymerized polyester of polyethylene terephthalate and polyethylene isophthalate. A parallel fiber, a sheath core type, and an eccentric sheath core type composite fiber in which any one thermoplastic resin selected from the above is a low melting point resin and polypropylene or polyethylene terephthalate is a high melting point resin. In particular, it is preferable to use a composite fiber of low-melting point polyester and polyethylene terephthalate from the viewpoint of good dirt scraping properties.

As the large-diameter fiber 2, one having crimpability can be used. Thereby, the feeling of thickness (bulkyness) of the cleaning sheet 1 can be improved, and good wiping comfort can be obtained. As the crimped form, there are a spiral type, a zigzag type, a U-shape, and the like, and any of these is preferably used.

The thick fiber 2 can be used alone or in combination of two or more. When the cleaning sheet 1 contains two or more kinds of fibers, it is preferable that the large-diameter fibers satisfying the fiber length and fineness are included so as to satisfy the content in total.

The scraping layer 5 also includes a small-diameter thermoplastic fiber (not shown; hereinafter also referred to as “small-diameter fiber”) having a fineness smaller than that of the large-diameter fiber 2 as a kind of thermoplastic fiber. It is preferable to use a fine fiber having a fineness of 0.5 dtex or more, particularly 1 dtex or more, on the condition that the fineness is smaller than that of the thick fiber 2. Moreover, it is preferable to use a fineness of 5 dtex or less, particularly 3 dtex or less. Specifically, it is preferable to use fibers having a fineness of 0.5 dtex to 5 dtex, particularly 1 dtex to 3 dtex. The proportion of the fine fiber in the scraping layer 5 is preferably 1% by mass or more, particularly preferably 5% by mass or more, and preferably 50% by mass or less, particularly preferably 30% by mass or less. Specifically, the proportion of the fine fiber in the scraping layer 5 is preferably 1% by mass or more and 50% by mass or less, and more preferably 5% by mass or more and 30% by mass or less. By incorporating the fine fiber in addition to the large diameter fiber 2 in the scraping layer 5, the basis weight can be reduced while maintaining the polishing property or scraping property of the scraping layer 5.

The small-diameter fibers are preferably short fibers like the large-diameter fibers 2. In this case, the fiber length of the small-diameter fiber is preferably 2 mm or more, more preferably 3 mm or more, and still more preferably 4 mm or more. Further, it is preferably 15 mm or less, more preferably 8 mm or less, and further preferably 6 mm or less. Specifically, the fiber length of the fine fiber is preferably 2 mm or more and 15 mm or less, more preferably 3 mm or more and 8 mm or less, and still more preferably 4 mm or more and 6 mm or less. Moreover, it is preferable that the small diameter fiber is comprised from the same kind or different kind of thermoplastic resin as the large diameter fiber 2. FIG. In particular, it is preferable that the thin fiber is composed of a heat-fusible fiber.

In the scraping layer 5, the intersections of the constituent fibers are joined. In detail, the intersection of the large diameter fibers 2, the intersection of the small diameter fibers, and the intersection of the large diameter fibers 2 and the small diameter fibers are joined. A plurality of large-diameter fibers 2 are erected, and the tips thereof are present on the surface of the scraping layer 5. When the large-diameter fiber 2 stands up, the longitudinal direction of the large-diameter fiber 2 (direction perpendicular to the cross section of the fiber) assumes that the in-plane direction of the scraping layer 5 is 0 degree (the fiber is lying without inclination). The angle formed by the in-plane direction and the longitudinal direction of the large-diameter fiber 2 is preferably 30 degrees or more, more preferably 45 degrees or more. When the large-diameter fiber 2 stands, one end of the large-diameter fiber 2 can be seen in plan view from the surface side on the surface of the scraping layer 5. Of the large-diameter fibers 2, the large-diameter fibers 2 included in the scraping layer 5 are preferably 50% or more, more preferably 80% or more. In particular, the fiber intersections of the large-diameter fibers 2 are joined, and the tip of the large-diameter fiber 2 is present on the surface of the scraping layer 5, so that the scraping layer 5 has sufficient abrasiveness or scraping. Sex is imparted. In this case, it is not necessary that the tip portions of all the large-diameter fibers 2 constituting the scraping layer 5 are present on the surface of the scraping layer 5, and a sufficient scraping performance of a target level is exhibited. Any degree is acceptable.

In order to make the tip of the large-diameter fiber 2 exist on the surface of the scraping layer 5, it is advantageous to form the scraping layer 5 by the air array method. Specifically, a large diameter fiber 2 composed of short fibers and a small diameter fiber composed of short fibers are deposited by an air array method to form a web, and the intersections of the fibers in this web are joined to form the large diameter fiber 2. The tip portion tends to exist on the surface of the scraping layer 5. As means for joining the intersections of the fibers, for example, adhesion using an adhesive or heat fusion can be used.

The basis weight of the scraping layer 5 is preferably 20 g / m ² or more, particularly preferably 30 g / m ² or more, more preferably 200 g / m ² or less, and particularly preferably 150 g / m ² or less. Specifically, the basis weight of the basis weight of the scraping layer 5 is preferably 20 g / m ² or more and 200 g / m ² or less, and more preferably 30 g / m ² or more and 150 g / m ² or less. By setting the basis weight of the scraping layer 5 within this range, the cleaning sheet 1 is preferable because the removal performance of dirt against sticking dirt around the kitchen and water is further enhanced.

The scraping layer 5 has a space between the fibers constituting it. This space includes a space formed by the large diameter fibers 2, a space formed by the small diameter fibers, and a space formed by the large diameter fibers and the small diameter fibers. In particular, the space formed by the large diameter fibers 2 is easily maintained even when subjected to external force. As shown in FIG. 3, a plurality of abrasive particles 6 can be present in this space. The abrasive particles 6 exist in such a space, and even if the abrasive particles 6 are in contact with the fiber, they can exist without being fixed with an adhesive or the like. In FIG. 3, reference numeral 9 indicates an adhesive or a fusion part that bonds the intersection of the large-diameter fibers 2. The abrasive particles 6 are used for the purpose of improving the polishing performance of the scraping layer 5 by a synergistic effect with the scraping performance of the large-diameter fiber 2. The abrasive particles 6 are preferably present in the space so as to be removable from the scraping layer 5. That the abrasive particles 6 are detachable means that the cleaning sheet 1 is applied when an external force due to vibration, bending, or the like is applied to the cleaning sheet 1 in a state where the cleaning sheet 1 is not wetted. This means that the abrasive particles 6 are present in the scraping layer 5 in such a manner that at least a part of the abrasive particles 6 falls off from the scraping layer 5. Accordingly, the abrasive particles 6 are not in a state of being fixed to the fibers by the bonding agent, unlike the technique described in Patent Document 2 described in the background art section above. In particular, it is different from the technique described in Patent Document 2 in that the abrasive particles do not fall off only after touching water or an aqueous solution, but easily fall off by an external force such as vibration in a dry state. Specific means for causing the abrasive particles 6 to be present in the scraping layer 5 in such a manner will be described later.

In the cleaning sheet 1, the falling amount (g / m ² ) of the abrasive particles 6 measured by the following method is 0.1% with respect to the amount (g / m ² ) of the abrasive particles 6 before dropping. Preferably, it is 0.3% or more, more preferably 3.0% or less, and further preferably 2.0% or less. Specifically, the falling amount (g / m ² ) of the abrasive particles 6 is 0.1% or more and 3.0% or less with respect to the amount (g / m ² ) of the abrasive particles 6 before dropping. It is more preferable that it is 0.3% or more and 2.0% or less.

[Abrasive particle shedding amount]
The degree of removal of the abrasive particles 6 from the scraping layer 5 can be measured by the following method. The cleaning sheet 1 is cut into a 10 cm × 7 cm rectangle to obtain a test piece. In an environment of 20 ° C. ± 5 ° C., the test piece is gripped with both hands with the short side of 7 cm facing upward, and cut along the long side direction of 10 cm. The cutting speed at this time is 5 cm / sec. . The substance dropped off by the tearing is collected, its mass (g) is measured, and it is converted into 1 m ² to be the falling amount (g / m ² ) of the abrasive particles 6.

The abrasive particles 6 are preferably present uniformly throughout the entire thickness direction of the scraping layer 5. However, it is advantageous that the abrasive particles 6 are not substantially present in the surface region 5A including the outermost surface of the scraping layer 5. The surface area 5 </ b> A is an area in the surface thickness direction that is configured by an aggregate of the tip portions 2 </ b> A of the plurality of large-diameter fibers 2 constituting the scraping layer 5. In particular, among the large-diameter fibers 2 constituting the scraping layer 5, the large-diameter fibers 2 having a tip portion on the surface of the scraping layer 5 have the abrasive particles 6 substantially in the tip region 2A including the tip portion. It is advantageous that they do not adhere to each other. “Substantially not adhered” means that when the tip region of the large-diameter fiber 2 is enlarged (50 ± 5 times), five large-diameter fibers are selected and the abrasive particles observed at the tip of the large-diameter fiber. It is said that the number of 6 is 10% or less with respect to the number of abrasive particles 6 observed in the selected large-diameter fiber 2 in the central portion of the scraping layer 5 in the thickness direction. The central portion in the thickness direction refers to a central portion when the scraping layer 5 is divided into three equal parts in the thickness direction. Due to the presence of the abrasive particles 6 in such a manner, when the dirt on the surface to be cleaned is removed by the scraping layer 5, the abrasive particles 6 are released quickly and in large quantities on the surface to be cleaned. Is done. As a result, it is possible to easily remove the dirt quickly and reliably. When the abrasive particles 6 are present up to the outermost surface of the scraping layer 5, when the surface to be cleaned is wet, the abrasive particles 6 existing on the outermost surface of the scraping layer 5 are wetted, It becomes difficult to drop off from the scraping layer 5. As a result, it becomes difficult for the abrasive particles 6 to be quickly supplied to the surface to be cleaned. The tip region is defined as a depth region within 5 times the diameter of the thick fiber 2 from the tip.

The abrasive particles 6 are preferably present in an amount of 150% by mass or more, particularly 200% by mass or more based on the mass of the scraping layer 5. Moreover, it is preferable that it is 900 mass% or less with respect to the mass of the scraping layer 5, especially 750 mass% or less exists. Specifically, the abrasive particles 6 are preferably present in an amount of 150% by mass or more and 900% by mass or less, and more preferably 200% by mass or more and 750% by mass or less, based on the mass of the scraping layer 5. preferable. Since the abrasive particles 6 are present in the scraping layer 5 at a ratio in this range, the polishing performance of the scraping layer 5 is further improved due to a synergistic effect with the scraping property of the large diameter fibers 2.

As the abrasive particles 6, water-insoluble particles are preferably used. The abrasive particles 6 preferably have a Mohs hardness of 3 or more and 7 or less from the viewpoint of abrasiveness. Examples of such abrasive particles 6 include calcium carbonate, zeolite, and silica (silica powder). These abrasive particles 6 can be used alone or in combination of two or more. The abrasive particles 6 preferably have an average particle diameter of 5 μm or more, particularly 10 μm or more. Moreover, it is preferable that it is 50 micrometers or less, especially 40 micrometers or less. Specifically, the average particle diameter of the abrasive particles 6 is preferably 5 μm or more and 50 μm or less, and more preferably 10 μm or more and 40 μm or less. The abrasive particles preferably have such an average particle size and a distribution in the particle size. By using the abrasive particles 6 having a hardness and an average particle diameter in this range, a sufficient polishing effect can be obtained while effectively preventing the surface to be cleaned from being scratched.

The average particle diameter of the abrasive particles 6 is measured by an electric resistance test method (Coulter counter method).

The scraping layer 5 may contain other cleaning components in addition to the abrasive particles 6 described above. For example, various surfactants can be used for the purpose of enhancing the cleaning effect against dirt. Specifically, an anionic surfactant such as alkylbenzene sulfonic acid or a nonionic surfactant such as polyoxyethylene alkyl ether can be used. Furthermore, for the purpose of enhancing the rinsing effect, a polymer of acrylic acid, methacrylic acid, or maleic acid or a salt thereof, a copolymer of maleic acid and another vinyl monomer, or a salt thereof is used. You can also.

The abrasive particles 6 can be present in the scraping layer 5 by the method described below, for example. First, a cleaning sheet in a state before the abrasive particles 6 are applied is prepared. “Applying” refers to coating so that abrasive particles are present in the scraping layer. A specific method for manufacturing the cleaning sheet 1 before the abrasive particles 6 are carried will be described later. Separately from this preparation, a slurry containing abrasive particles 6 is prepared. It is convenient to use water as the liquid medium of the slurry. Specific examples of the slurry are described in, for example, JP-A-2006-104264 and JP-A-2006-104265. A small amount of a surfactant may be included in the slurry from the viewpoint of dispersion of the abrasive particles 6. In that case, the surfactant is preferably contained in an amount of 20% by mass or less, more preferably 10% by mass or less, based on the mass of the slurry. The surfactant may be contained in the slurry, but is preferably not contained. By adding or removing a small amount of a surfactant in the slurry, after the slurry is applied and dried, the abrasive particles 6 are detachably held between the fibers without being fixed to the fibers of the scraping layer 5. The term “non-sticking” means that the abrasive particles 6 are not fixed to the fiber by adhesion or fusion, and if the vibration is applied without using a solvent such as an aqueous solution, all or a part of the abrasive particles 6 are scraped. Saying to fall off the take-up layer 5.

The slurry is applied to the scraping layer 5 of the cleaning sheet in a state before the abrasive particles 6 are applied. For the coating, for example, a die coater or a gravure roll coater can be used. By this coating, a wet coating film containing abrasive particles 6 is formed on the scraping layer 5. While the coating film is wet, a member having a smooth surface is pressed against the scraping layer 5. By this pressing, the slurry is filled in the space formed by the large-diameter fibers 2 constituting the scraping layer 5 and the slurry is removed from the surface area 5 </ b> A of the scraping layer 5. As a result, the abrasive particles 6 are not substantially present in the surface region 5A including the outermost surface of the scraping layer 5. As a result, the abrasive particles 6 are prevented from substantially adhering to the tip region 2A including the tip of the large-diameter fiber 2 having the tip on the surface of the scraping layer 5. In the present invention, as described above, the tip region is defined as a region within 5 times the diameter of the large-diameter fiber from the tip (region indicated by reference numeral 2A in FIG. 3).

As the member used for the pressing, for example, a synthetic resin film, a metal plate, natural fiber yarn, synthetic fiber yarn, or the like is used. Of these, a film made of a synthetic resin is particularly preferable.

After the pressing, the abrasive particles 6 are substantially not present in the surface region 5A including the outermost surface of the scraping layer 5, and then the coating film is dried. After the coating film is dried, the surface of the scraping layer 5 is wiped with a wiping member. By this wiping, the abrasive particles 6 are prevented from further existing in the surface area 5A including the outermost surface of the scraping layer 5. As the wiping member, for example, fiber sheets such as various nonwoven fabrics and woven fabrics, brushes using synthetic resin fibers, brushes using natural fibers, and the like can be used.

Next, the liquid holding layer 4 in the cleaning sheet 1 will be described. The liquid holding layer 4 is a layer capable of absorbing and holding water. For this purpose, it is preferable that the liquid holding layer 3 includes the hydrophilic fiber 3. As the hydrophilic fiber, for example, a cellulose fiber is preferably used. Examples thereof include pulp fiber, cotton fiber, rayon fiber and the like, and it is particularly preferable to use pulp fiber. In particular, it is preferable to use a softwood-derived pulp fiber as the cellulosic fiber from the viewpoint of preventing the hydrophilic fiber 3 from falling off and expressing an appropriate sheet strength.

The fiber length of the hydrophilic fiber 3 contained in the liquid holding layer 4 is appropriately selected according to the method for manufacturing the liquid holding layer 4. When the liquid holding layer 4 is manufactured by, for example, the air array method, the fiber length of the hydrophilic fiber 3 is preferably 0.1 mm or more and 15 mm or less, and particularly preferably 0.3 mm or more and 10 mm or less. In the air array method, the intersections of the fibers are joined by fusion or adhesion. In the case of bonding, any binder can be used. Specific examples of the binder include acrylonitrile-butadiene rubber.

The ratio of the hydrophilic fibers 3 in the cleaning sheet 1 is preferably 10% by mass or more, and more preferably 20% by mass or more. Moreover, it is preferable that it is 90 mass% or less. Specifically, the ratio of the hydrophilic fiber 3 to the cleaning sheet 1 is 10% by mass or more and 90% by mass or less, and particularly 20% by mass or more and 90% by mass or less from the viewpoint of the absorbability of the dirty liquid. preferable. The liquid retaining layer 4 has a heat-fusibility as a fiber other than the hydrophilic fiber 3 and having a fineness of 0.5 to 5 dtex, particularly 1 to 3 dtex, and a fiber length of 2 to 15 mm, particularly 3 to 8 mm. It is preferable that fibers are included. The heat-fusible fiber is preferably contained in the liquid holding layer 4 in an amount of 10% by mass to 90% by mass, particularly 10% by mass to 80% by mass. Examples of the heat-fusible fiber include a low-melting polyolefin fiber, a polyester fiber, and a low-melting resin and a high-melting resin as described above, and the low-melting resin forms part of the fiber surface. A composite fiber or the like can be used.

The basis weight of the liquid retaining layer 4 is preferably 30 g / m ² or more, particularly preferably 40 g / m ² or more, more preferably 100 g / m ² or less, and particularly preferably 80 g / m ² or less. Specifically, the basis weight of the basis weight of the liquid holding layer 4 is preferably 30 g / m ² or more and 100 g / m ² or less, and more preferably 40 g / m ² or more and 80 g / m ² or less. By setting the basis weight of the liquid holding layer 4 within this range, it is possible to sufficiently absorb and hold the sewage. The total basis weight of the cleaning sheet 1 including the scraping layer 5 and the liquid holding layer 4 is preferably 50 g / m ² or more and 300 g / m ² or less.

In the cleaning sheet 1, a plurality of tip portions of the large-diameter fibers 2 are also present on the surface 4 a opposite to the surface facing the scraping layer 5 among the surfaces of the liquid holding layer 4, Exhibits polishing and scraping properties against existing dirt. That is, each surface of the cleaning sheet 1 has a polishing property or a scraping property against dirt existing on the surface to be cleaned. However, the number of tip portions of the large diameter fibers 2 existing on the surface of the scraping layer 5 is different from the number of tip portions of the large diameter fibers 2 existing on the surface of the liquid holding layer 4. Specifically, when the number of tip portions of the large-diameter fibers 2 present on the surface of the scraping layer 5 is compared with the number of large-diameter fibers 2 present on the surface of the liquid retaining layer 4, the surface of the liquid retaining layer 4 is compared. The number of large diameter fibers 2 is preferably smaller than the number of large diameter fiber tips on the surface of the scraping layer 5. Since the scraping performance against dirt depends on the number of tip portions of the same type of the large-diameter fiber 2, the scraping performance of the scraping layer 5 and the scraping of the liquid holding layer 4 in this embodiment. The take-off performance is different. Specifically, the scraping performance of the scraping layer 5 is higher than the scraping performance of the liquid holding layer 4. By carrying out like this, the surface of the suitable layer of the scraping off layer 5 or the liquid holding layer 4 can be used for cleaning according to the degree of dirt sticking. Further, the tip of the large-diameter fiber 2 is also present on the surface opposite to the surface where the dirt is being scraped off, and the anti-slip function of the hand is exerted by the frictional force caused by the tip of the large-diameter fiber 2. Therefore, the operability of scraping is improved. From the viewpoint of making these advantageous effects more remarkable, the number of the large-diameter fibers 2 on the surface of the liquid holding layer 4 is 0. 0 of the number of the large-diameter fibers on the surface of the scraping layer 5. It is preferably 1% or more, more preferably 0.3% or more, and further preferably 0.5% or more. The number of large diameter fibers 2 on the surface of the liquid retaining layer 4 is preferably 20% or less, and preferably 15% or less of the number of large diameter fibers on the surface of the scraping layer 5. More preferably, it is more preferably 10% or less. Specifically, the number of the large diameter fibers 2 on the surface of the liquid holding layer 4 is 0.1% or more and 20% or less of the number of the large diameter fibers on the surface of the scraping layer 5. Preferably, it is 0.3% or more and 15% or less, and more preferably 0.5% or more and 10% or less.

The number of the tip portions of the large-diameter fibers on the surfaces of the scraping layer 5 and the liquid holding layer 4 is measured by the following method. The cleaning sheet 1 is cut into a 10 cm × 1 cm rectangle to obtain a test piece. The cut surface on the 10 cm side of the test piece is the front, and the surface of the cleaning sheet is observed from a direction inclined 10 degrees from the front to the surface of the cleaning sheet 1 by means such as a magnifying glass. The number of large-diameter fibers rising at an angle of 25 degrees or more from the observed surface of the cleaning sheet 1 is measured. The measurement result is multiplied by 1/10 to obtain the number of ends of the large-diameter fiber (lines / cm ² ). If the test piece of the specified size cannot be cut out, create a test piece of any size and calculate the surface area, then calculate the number per unit area from the results measured by the same method, The number of tip portions (lines / cm ² ) may be used.

The number of tip portions of the large-diameter fibers 2 present on the surface of the scraping layer 5 is a sufficient number to exhibit sufficient polishing properties or scraping properties against dirt existing on the surface to be cleaned, preferably 20 / Cm ² or more, more preferably 50 pieces / cm ² or more, more preferably 100 pieces / cm ² or more, particularly preferably 120 pieces / cm ² , or 4000 pieces / cm ² or less, more preferably 2000 pieces / cm ^2. cm ² , more preferably 1000 / cm ² , and particularly preferably 600 / cm ² or less. Specifically, twenty / cm ² ~ 4000 present / cm ^2, more preferably 50 lines / cm ² ~ 2000 present / cm ^2, more preferably 100 / cm ² ~ 1000 present / cm ^2, particularly preferably 120 / cm ² to 600 / cm ² .

On the other hand, the number of the tip portions of the large-diameter fibers 2 present on the surface of the liquid holding layer 4 is preferably 0.1 from the viewpoint of expressing sufficient frictional force with the hand and removing light sticking dirt. The number / cm ² or more, more preferably 1 / cm ² or more, still more preferably 5 / cm ² or more, and particularly preferably 10 / cm ² or more. Further, it is 100 / cm ² or less, more preferably 60 / cm ² or less, still more preferably 50 / cm ² or less, and particularly preferably 40 / cm ² or less. Specifically, 0.1 present / cm ² or more 100 / cm ² or less, more preferably one / cm ² or more sixty / cm ² or less, more preferably five / cm ² 50 or more / cm ² Hereinafter, it is particularly preferably 10 / cm ² or more and 40 / cm ² or less.

When attention is focused on one large-diameter fiber 2, one end of the large-diameter fiber 2 is present on the surface of the scraping layer 5, and the other end is on the surface of the liquid holding layer 4. May be present. Alternatively, one end of the thick fiber 2 is present on the surface of the scraping layer 5, and the other tip is present in the scraping layer 5 or in the liquid holding layer 4. Also good. Alternatively, one end of the large-diameter fiber 2 exists on the surface of the liquid holding layer 4 and the other tip exists in the liquid holding layer 4 or the scraping layer 5. Also good. Therefore, a part of the large diameter fiber 2 is present not only in the scraping layer 5 but also in the liquid holding layer 4.

As described above, the cleaning sheet 1 is of a dry type before use. In use, it can be left dry or can be used wet. When the wet surface is used, the surface to be cleaned, for example, the hard surface is wetted with water, the wet hard surface is cleaned with the scraping layer 5, and then the wet hard surface contains moisture, that is, dirt. Cleaning can be performed by the procedure of wiping off the dirty liquid with the liquid holding layer 4. Since the surface of the liquid holding layer 4 also has a scraping performance against dirt, the hard surface can be further cleaned simultaneously with the wiping of the dirty liquid.

The mechanism for removing dirt by the cleaning sheet 1 is, for example, as follows when wetted. The hard surface is moistened with water, and the surface on the scraping layer 5 side of the cleaning sheet 1 is pressed against and rubbed against the wet hard surface. As a result, the abrasive particles 6 are released from the scraping layer 5 and supplied to the surface C to be cleaned, as shown in FIG. The released abrasive particles 6 and the tips of the large-diameter fibers 2 present in large numbers on the surface of the scraping layer 5 polish or scrape the dirt D present on the surface C to be cleaned. By these actions, the dirt D is removed from the surface C to be cleaned. The removed dirt D dissolves or disperses in water and is absorbed by the liquid holding layer 4 together with water. In this way, the surface C to be cleaned is in a clean state.

In the cleaning sheet 1, the air permeability T _{VD in} the vertical thickness direction is preferably smaller than the air permeability T _MD in the in-plane direction. Further, it is preferable that the air permeability T _{VD in} the vertical thickness direction of the liquid holding layer 4 is smaller than the air permeability T _{VD in} the vertical thickness direction of the scraping layer 5. By doing so, the abrasive particles 6 are held between the fibers of the scraping layer 5, but the abrasive particles 6 stay in the scraping layer 5 without penetrating to the liquid holding layer 4 side, and water or the like is used for cleaning. Even if the liquid medium is not added, the abrasive particles 6 are easily released to the surface to be cleaned. By controlling the air permeability in this way, the back side of the abrasive grains 6 is prevented so that the abrasive particles 6 are closer to the back surface side (liquid holding layer 4) of the scraping layer 5 in the thickness direction of the cleaning sheet 1. It is preferable that there is a relatively large amount at the position and a relatively small amount or no surface surface side (cleaning surface side). In order to control the air permeability ratio between the vertical direction and the in-plane direction, for example, the degree of standing of the constituent fibers may be controlled. By erecting the constituent fibers, the air permeability in the vertical direction increases and the air permeability in the in-plane direction decreases.

In order to set the value of the ratio T _MD / T _VD within the above-described range, for example, the air-laying condition when the scraping layer 5 is formed by the air-laying method, and the length of the large-diameter fiber 2 to be used The fineness and the like are appropriately adjusted, and the degree of standing of the large-diameter fibers 2 in the scraping layer 5 and the fiber density of the large-diameter fibers 2 may be controlled as described above.

The cleaning sheet 1 can be formed into a laminated body by regularly laminating a plurality of sheets, for example, and the laminated body can be accommodated in a packaging material to form a cleaning sheet packaging body. The packaging material preferably includes an opening for taking out the cleaning sheet 1 from the packaging material, and a resealable closing member for closing the opening. In the laminated body, for example, a plurality of cleaning sheets 1 are regularly stacked such that the liquid holding layer 4 side of the cleaning sheet 1 faces upward. It is preferable to store the laminated body in this state in the packaging material so that the liquid holding layer 4 side faces the opening. By adopting such a storage mode, when the cleaning sheet 1 is picked up and taken out from the packaging material with a finger, the finger feels a sense of irritation (sensation that the tip of the standing large-diameter fiber 2 stimulates the finger). Since it is reduced, it is preferable. This is because, when the cleaning sheet 1 is picked and taken out from the packaging material with the finger, the belly of the finger comes into contact with the liquid holding layer 4 which is a layer having a relatively small number of the tips of the large-diameter fibers 2. This is because the scraping layer 5 that may give a tingling sensation is difficult to contact the belly of the finger. It is preferable to clearly indicate or mark the scraping side so that the liquid holding layer side can be easily identified.

It is preferable from the viewpoint of protecting the contents that the packaging material is a separate packaging body enclosed in a separate packaging material having an opening or a hook provided at the peripheral edge. The opening or hook of the separate package is provided for the purpose of allowing the separate package to be suspended. This separate package is advantageous in that it can be easily suspended by an opening or a hook when it is displayed at a store. The separate package may be resealable.

The above-mentioned packaging material may be provided with an opening or a hook directly on the peripheral edge without using another packaging material. The packaging material may be resealable.

As another packaging mode of the cleaning sheet 1, there is an individual package of cleaning sheets in which one cleaning sheet 1 is housed in a packaging material and individually packaged. In this individual package, a cut line or a perforation may be included so as to be easily opened. It is preferable that an opening or a hook is provided on the peripheral edge of the individual packaging material. The opening or the hook is provided for the purpose of allowing the individual package to be suspended. This individual package is advantageous in that it can be easily hung by an opening or a hook when it is displayed over the counter. Furthermore, a plurality of individual packages can be arranged in a row so that the first individual package can be hung with an opening or a hook, and after the second, 5 to 10 can be separated by joints or perforations. In a state where it is possible, it can be sold by hanging it in a store and separating it.

As another packaging form of the cleaning sheet 1, there is a packaging body of a cleaning sheet in which the cleaning sheet 1 formed on a long length is stored in a rolled state in a packaging material. . In this package, it becomes easier to use by performing cutting assisting processing such as incision lines and perforations extending in the width direction for every fixed length of the cleaning sheet.

The cleaning sheet 1 of the present embodiment can be produced by the following method according to the method described in JP-A-2003-61885.
<Method 1>
The liquid holding layer 4 is formed by fusing or bonding the intersections of the constituent fibers in the web containing cellulosic fibers and formed by the air array method. In addition to the formation of the liquid retaining layer 4, scraping of the air laid layer is performed by fusing or bonding the intersections of the constituent fibers in the web including the large diameter fiber and the small diameter fiber and formed by the air laying method with a binder. Layer 5 is formed. Then, the scraping layer 5 is laminated and integrated on one surface of the liquid holding layer 4.
<Method 2>
On one side of a web containing cellulosic fibers and formed by the air array method, a web containing large diameter fibers and small diameter fibers and formed by the air array method is laminated, and the intersection of the constituent fibers of each web and between the two webs Are adhered by fusing or bonding to form the liquid retaining layer 4 and the scraping layer, and the liquid retaining layer 4 and the scraping layer 5 are integrated.

In the above method 1 and method 2, in order to make the tip of the large diameter fiber exist on the surface of the liquid holding layer 4, for example, the following manufacturing conditions may be employed. In other words, a small amount of large-diameter fiber is included when the web is formed by the air array method including cellulosic fibers, and the large-diameter fiber is blended in the liquid holding layer 4.

The following method 2A can also be adopted as a modification of the method 2.
<Method 2A>
The liquid-retaining layer 4 is formed by fusing or bonding the intersections of the constituent fibers in the web containing cellulosic fibers, small-diameter fibers and large-diameter fibers and formed by the air array method. In addition to the formation of the liquid retaining layer 4, scraping of the air laid layer is performed by fusing or bonding the intersections of the constituent fibers in the web including the large diameter fiber and the small diameter fiber and formed by the air laying method with a binder. Layer 5 is formed. Then, the scraping layer 5 is laminated and integrated on one surface of the liquid holding layer 4. This method can be performed using, for example, the manufacturing apparatus 10 shown in FIG.

The manufacturing apparatus 10 shown in FIG. 5 has an endless conveyor belt 13 that circulates in one direction D. The conveyor belt 13 is made of a material having air permeability. The conveyor belt 13 is composed of, for example, a metal mesh belt. Above the conveyor belt 13, a first head portion 11 and a second head portion 12 for supplying fibers are installed along the circumferential direction D of the conveyor belt 13. The first head unit 11 is installed on the upstream side of the second head unit 12. A first fiber and a second fiber are supplied to each of the

head portions

11 and 12 from a feeder (not shown). The first fibers include cellulosic fibers, small diameter fibers, and large diameter fibers. The second fiber includes a large diameter fiber and a small diameter fiber, and does not include a cellulosic fiber. Further, air is supplied to the

head portions

11 and 12 from an air supply source (not shown). The air supplied to the

head portions

11 and 12 is used for the purpose of depositing the first fiber and the second fiber on the upper surface of the conveyor belt 13. Furthermore, each

head part

11 and 12 is provided with the some brush roll 14, respectively. The brush roll 14 is composed of comb teeth erected on the peripheral surface of the roll body. The comb teeth are erected in the normal direction of the sh peripheral surface of the roll body. The brush roll 14 is used for the purpose of dispersing the first fiber and the second fiber respectively supplied to the

head units

11 and 12.

In the manufacturing apparatus 10, the 1st suction box 21 and the 2nd suction box 22 are installed in the position inside the circulating conveyor belt 13 so that each

head part

11 and 12 may be opposed. The first suction box 21 and the second suction box 22 perform suction when the first fibers and the second fibers are conveyed to the air and dispersed from the

head portions

11 and 12, and these fibers are conveyed to the conveyor belt. Used to ensure deposition on 13.

In order to manufacture the cleaning sheet 1 using the manufacturing apparatus 10, for example, firstly, first fibers including cellulosic fibers, small-diameter fibers, and large-diameter fibers are supplied to the first head unit 11 and dispersed by the brush roll 14. Then, the first fibers are conveyed in an air flow and dispersed downward from the first head portion 11, that is, toward the upper surface of the conveyor belt 13. As a result, the liquid holding layer 4 made of the airlaid layer web is formed. Next, a scraping layer 5 made of a web of an airlaid layer containing large diameter fibers and small diameter fibers is formed and laminated on the formed liquid holding layer 4. The scraping layer 5 is formed by supplying second fibers including small diameter fibers and large diameter fibers to the second head portion 12 and dispersing them with the brush roll 14, and then transporting the second fibers to the air flow. Then, it is sprayed downward from the second head portion 12, that is, toward the upper surface of the liquid holding layer 4. Then, the liquid holding layer 4 and the scraping layer 5 are integrated by a predetermined means.

When the cleaning sheet 1 is manufactured using the manufacturing apparatus 10, the liquid holding layer is adjusted by adjusting the degree of suction of the first suction box 21 when forming the liquid holding layer 4 made of the airlaid layer web. It is possible to control the number of tip portions of the large-diameter fibers on the surface opposite to the surface facing the airlaid layer 5 among the four surfaces. Specifically, by increasing the degree of suction of the first suction box 21, the number of the tip portions of the large-diameter fibers on the surface of the liquid holding layer 4 opposite to the surface facing the airlaid layer 5. Can be more. Alternatively, the tip of the large-diameter fiber on the surface opposite to the surface facing the airlaid layer 5 of the surface of the liquid holding layer 4 can be increased by increasing the proportion of the large-diameter fiber in the first fiber. You can increase the number.

Although the manufacturing apparatus 10 shown in FIG. 5 includes two head units that spread fibers, the manufacturing apparatus 10 may include three or more head units instead. For example, the manufacturing apparatus 10 may include a first head unit, a second head unit, and a third head unit in order from the upstream side along the circumferential direction D of the conveyor belt 13. In this case, it is preferable to install first to third suction boxes corresponding to the number of head portions. In the case of using the manufacturing apparatus having this configuration, the first fiber including the cellulosic fiber, the fine fiber, and the thick fiber is supplied to the first head part, and the cellulosic fiber and the fine fiber are supplied to the second head part. Supplying second fibers (not including large-diameter fibers), and supplying third fibers (not including cellulosic fibers) including small-diameter fibers and large-diameter fibers to the third head portion. preferable. The cleaning sheet 1 manufactured in this way is located between the liquid retaining layer 4 made of the first fibers, the scraping layer 5 made of the third fibers, and both the

layers

4, 5, and both the

layers

4, 5. And an intermediate layer having an intermediate fiber composition. Also in this case, by increasing the degree of suction of the first suction box 21, the tip of the large-diameter fiber on the surface of the liquid holding layer 4 opposite to the surface facing the airlaid layer 5 You can increase the number. In addition, it is preferable to make the suction force of the second suction box weaker than the suction force of the first suction box and the third suction box.

6 (a) and 6 (b) show another embodiment of the cleaning sheet 1 of the present invention. The cleaning sheet 1 shown in the figure is different in the structure of the liquid holding layer 4 from the cleaning sheet shown in FIGS. Specifically, in the cleaning sheet shown in FIGS. 1 to 4, the abrasive particles were not attached to the tip of the large-diameter fiber 2 present on the surface of the liquid holding layer 4. In the cleaning sheet 1, there is a space between the tips of the large-diameter fibers 2 existing on the surface of the liquid holding layer 4, and the abrasive particles 6 are present in the space so as to be detached. And the large diameter fiber 2 in which the front-end | tip part exists in the surface of the liquid holding | maintenance layer 4 is in the state to which the abrasive particle 6 has not adhered substantially to the front-end | tip region containing this front-end | tip part. The abrasive particles 6 are in contact with the large-diameter fibers 2 but are present without being fixed with an adhesive or the like. The abrasive particles 6 are preferably present in the space so as to be removable from the liquid holding layer 4. That the abrasive particles 6 are detachable means that the cleaning sheet 1 is applied when an external force due to vibration, bending, or the like is applied to the cleaning sheet 1 in a state where the cleaning sheet 1 is not wetted. It means that the abrasive particles 6 are present in the scraping layer 5 in such a manner that at least a part of the abrasive particles 6 falls off from the liquid holding layer 4.

The abrasive particles 6 are preferably present uniformly throughout the entire thickness direction of the liquid holding layer 4. However, it is advantageous that the abrasive particles 6 are not substantially present in the surface area including the outermost surface of the liquid holding layer 4. The definition of “surface area” is as described above. In addition, the definition of “substantially does not exist” is as described above. Due to the presence of the abrasive particles 6 in such a manner, when the dirt on the surface to be cleaned is removed by the liquid holding layer 4, the abrasive particles 6 are released quickly and in large quantities on the surface to be cleaned. Is done. As a result, it is possible to easily remove the dirt quickly and reliably. The tip region is defined as a depth region within 5 times the diameter of the thick fiber 2 from the tip.

Regarding the cleaning sheet 1 of the present embodiment, the description in detail regarding the cleaning sheet shown in FIG. 1 to FIG.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the cleaning sheet 1 described so far has been of a dry type, but instead of this, the cleaning sheet 1 is impregnated with water or an aqueous cleaning agent containing water and a surfactant. It may be a wet type.

In the embodiment, when the abrasive particles 6 are applied to the scraping layer 5, a member having a smooth surface is used, the member is pressed against the coating film of the slurry containing the abrasive particles 6, and then dried. Although the operation of wiping the coating film with the fiber sheet was performed, the operation of wiping with the fiber sheet may not be performed. The same applies to the liquid holding layer 4.

Further, in the above-described embodiment, the abrasive particles 6 are attached to the large-diameter fibers 2, but the use of the abrasive particles 6 is not essential, and depending on the specific application of the cleaning sheet 1, the abrasive particles 6 6 may not be used.

This invention discloses the following cleaning sheets further regarding embodiment mentioned above.
<1>
A cleaning sheet having a liquid holding layer containing cellulosic fibers and a heat-fusible fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm, and an airlaid layer laminated on one side thereof,
The airlaid layer includes thermoplastic fibers, and the intersections of the constituent fibers are fused or bonded,
The airlaid layer includes a large-diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a small-diameter thermoplastic fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm,
A plurality of tip portions of the large-diameter thermoplastic fiber are present on the surface of the airlaid layer, and have a polishing property or a scraping property for dirt existing on the surface to be cleaned,
A plurality of tip portions of the large-diameter thermoplastic fiber are also present on the surface of the liquid retaining layer opposite to the surface facing the airlaid layer, and the number of the present portions is present on the surface of the airlaid layer. The cleaning sheet is less than the number of the tip portions of the large-diameter thermoplastic fibers.

<2>
The number of tip portions of the large-diameter thermoplastic fibers present on the surface of the liquid holding layer is 0.1% or more of the number of tip portions of the large-diameter thermoplastic fibers present on the surface of the airlaid layer 20 % Of the cleaning sheet according to the above <1>.
<3>
The cleaning sheet according to <1> or <2>, wherein 10% by mass or more of the large-diameter thermoplastic fiber is contained.
<4>
The proportion of the large-diameter thermoplastic fiber in the cleaning sheet is preferably 10% by mass to 90% by mass, more preferably 30% by mass to 90% by mass, and more preferably 50% by mass to 90% by mass. The cleaning sheet according to any one of the above items <1> to <3>, which is more preferably as follows.
<5>
The intersection of the constituent fibers in the web containing the cellulosic fiber and the heat-fusible fiber is fused or bonded, thereby forming the liquid holding layer,
Apart from the liquid retaining layer, the intersections of the constituent fibers in the web containing the large-diameter thermoplastic fiber and the small-diameter thermoplastic fiber are fused or bonded, thereby forming the airlaid layer. And
The cleaning sheet according to any one of <1> to <4>, wherein the airlaid layer is laminated on one side of the liquid holding layer, and both layers are integrated.
<6>
The web containing the large-diameter thermoplastic fiber and the small-diameter thermoplastic fiber is laminated on one side of the web containing the cellulosic fiber and the heat-fusible fiber,
The intersections of the constituent fibers of each web and the webs are fused or bonded together, thereby forming the liquid retaining layer and the airlaid layer, and the liquid retaining layer and the airlaid layer. The cleaning sheet according to any one of <1> to <4>, wherein is integrated.

<7>
The airlaid layer has a space between the large-diameter thermoplastic fibers, and abrasive particles are present in the space so as to be removable.
The large-diameter thermoplastic fiber having a tip on the surface opposite to the surface facing the liquid holding layer in the airlaid layer has the abrasive particles substantially in the tip region including the tip. The cleaning sheet according to any one of <1> to <6>, wherein the cleaning sheet is not attached.
<8>
The cleaning sheet according to any one of <1> to <7>, wherein the cleaning sheet has a two-layer structure including the liquid holding layer and the airlaid layer.
<9>
The airlaid layer is the cleaning sheet according to any one of <1> to <8>, wherein the surface has an uneven structure.
<10>
The airlaid layer is the cleaning sheet according to any one of <1> to <9>, wherein the surface has a rhombic lattice-shaped recess.
<11>
The airlaid layer has concave portions of a rhombus lattice on the surface,
The region taken in by the rhombic lattice-shaped concave portion is a non-fused portion made of a convex portion and having a lower density than the concave portion, and the concave portion has a higher density than the non-embossed region. The cleaning sheet according to any one of <1> to <10>.

<12>
The airlaid layer has an uneven structure on its surface,
The cleaning sheet according to any one of <1> to <11>, wherein the pattern shape of the recess is an arbitrary shape of a line shape, a dot shape, or a specific pattern.
<13>
The airlaid layer has an uneven structure on its surface,
The total area of the recesses is preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less with respect to the area of the cleaning surface of the cleaning sheet. The cleaning sheet according to any one of the above.
<14>
The cleaning sheet according to any one of <1> to <13>, wherein the cleaning sheet has a perforation.
<15>
The cleaning sheet according to any one of <1> to <14>, wherein the large-diameter thermoplastic fiber is a short fiber.
<16>
The cleaning sheet according to any one of <1> to <15>, wherein the large-diameter thermoplastic fiber has crimpability.

<17>
The cleaning sheet according to any one of <1> to <16>, wherein the small-diameter thermoplastic fiber is a short fiber.
<18>
The cleaning sheet according to any one of <1> to <17>, wherein a plurality of large-diameter thermoplastic fibers are erected on the surface of the airlaid layer, and the leading ends thereof are present.
<19>
The large-diameter thermoplastic fiber preferably has an angle between the in-plane direction and the longitudinal direction of the large-diameter thermoplastic fiber when the longitudinal direction of the large-diameter thermoplastic fiber is 0 degrees in the in-plane direction of the airlaid layer. Is the cleaning sheet according to any one of <1> to <18>, which is inclined at 30 degrees or more, more preferably at least 45 degrees.
<20>
The cleaning sheet according to any one of <1> to <19>, wherein the cellulosic fiber is a hydrophilic fiber.
<21>
A cleaning sheet packaging body in which a laminate in which a plurality of the cleaning sheets according to any one of <1> to <20> are laminated is housed in a packaging material.

<22>
The packaging material for cleaning according to <21>, wherein the packaging material includes an opening for taking out the cleaning sheet from the packaging material, and a resealable closing member for closing the opening. .
<23>
The cleaning sheet package according to <21> or <22>, in which a plurality of the cleaning sheets 1 are stacked such that the liquid holding layer side of the cleaning sheet faces upward.

As described above in detail, according to the cleaning sheet of the present invention, each surface of the sheet has a scraping performance and the scraping performance is different, so that an appropriate surface is provided according to the degree of dirt sticking. Can be used. In addition, since the surface opposite to the surface from which dirt is being scraped exhibits a function of preventing hand slipping, the operability of scraping is improved.

Claims

A cleaning sheet having a liquid holding layer containing cellulosic fibers and a heat-fusible fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm, and an airlaid layer laminated on one side thereof,
The airlaid layer includes thermoplastic fibers, and the intersections of the constituent fibers are fused or bonded,
The airlaid layer includes a large-diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a small-diameter thermoplastic fiber having a fineness of 0.5 to 5 dtex and a fiber length of 2 to 15 mm,
A plurality of tip portions of the large-diameter thermoplastic fiber are present on the surface of the airlaid layer, and have a polishing property or a scraping property for dirt existing on the surface to be cleaned,
A plurality of tip portions of the large-diameter thermoplastic fiber are also present on the surface of the liquid retaining layer opposite to the surface facing the airlaid layer, and the number of the present portions is present on the surface of the airlaid layer. The cleaning sheet is less than the number of the tip portions of the large-diameter thermoplastic fibers.
The number of tip portions of the large-diameter thermoplastic fibers present on the surface of the liquid holding layer is 0.1% or more of the number of tip portions of the large-diameter thermoplastic fibers present on the surface of the airlaid layer 20 The cleaning sheet according to claim 1, which is not more than%.
The cleaning sheet according to claim 1 or 2, wherein the large-diameter thermoplastic fiber is contained in an amount of 10% by mass or more.
The cleaning sheet according to any one of claims 1 to 3, wherein a ratio of the large-diameter thermoplastic fiber in the cleaning sheet is 10% by mass or more and 90% by mass or less.
The intersection of the constituent fibers in the web containing the cellulosic fiber and the heat-fusible fiber is fused or bonded, thereby forming the liquid holding layer,
Apart from the liquid retaining layer, the intersections of the constituent fibers in the web containing the large-diameter thermoplastic fiber and the small-diameter thermoplastic fiber are fused or bonded, thereby forming the airlaid layer. And
The cleaning sheet according to any one of claims 1 to 4, wherein the airlaid layer is laminated on one side of the liquid holding layer, and both layers are integrated.
The web containing the large-diameter thermoplastic fiber and the small-diameter thermoplastic fiber is laminated on one side of the web containing the cellulosic fiber and the heat-fusible fiber,
The intersections of the constituent fibers of each web and the webs are fused or bonded together, thereby forming the liquid retaining layer and the airlaid layer, and the liquid retaining layer and the airlaid layer. The sheet | seat for cleaning as described in any one of Claim 1 thru | or 4 in which these are integrated.
The airlaid layer has a space between the large-diameter thermoplastic fibers, and abrasive particles are present in the space so as to be removable.
The large-diameter thermoplastic fiber having a tip on the surface opposite to the surface facing the liquid holding layer in the airlaid layer has the abrasive particles substantially in the tip region including the tip. The sheet | seat for cleaning as described in any one of Claims 1 thru | or 6 which has not adhered.
The cleaning sheet according to any one of claims 1 to 7, wherein the cleaning sheet has a two-layer structure including the liquid holding layer and the airlaid layer.
The cleaning sheet according to any one of claims 1 to 8, wherein the airlaid layer has an uneven structure on a surface thereof.
The cleaning sheet according to any one of claims 1 to 9, wherein the airlaid layer has a rhombic lattice-shaped recess on a surface thereof.
The airlaid layer has concave portions of a rhombus lattice on the surface,
The region taken in by the rhombic lattice-shaped concave portion is a non-fused portion which is a convex portion and has a lower density than the concave portion, and the concave portion has a higher density than the non-embossed region. The cleaning sheet according to any one of 1 to 10.
The airlaid layer has an uneven structure on its surface,
The cleaning sheet according to any one of claims 1 to 11, wherein a pattern shape of the recess is an arbitrary shape of a line shape, a dot shape, or a specific pattern.
The airlaid layer has an uneven structure on its surface,
The cleaning sheet according to any one of claims 1 to 12, wherein a total area of the recesses is 5% or more and 50% or less with respect to an area of the cleaning surface of the cleaning sheet.
The cleaning sheet according to any one of claims 1 to 13, which has a perforation.
The cleaning sheet according to any one of claims 1 to 14, wherein the large-diameter thermoplastic fiber is a short fiber.
The cleaning sheet according to any one of claims 1 to 15, wherein the large-diameter thermoplastic fiber has crimpability.
The cleaning sheet according to any one of claims 1 to 16, wherein the small-diameter thermoplastic fiber is a short fiber.
The cleaning sheet according to any one of claims 1 to 17, wherein a plurality of large-diameter thermoplastic fibers are erected on the surface of the airlaid layer, and the tips thereof are present.
In the large-diameter thermoplastic fiber, when the longitudinal direction of the large-diameter thermoplastic fiber is 0 degrees in the in-plane direction of the airlaid layer, the angle formed by the in-plane direction and the longitudinal direction of the large-diameter thermoplastic fiber is 30. The cleaning sheet according to any one of claims 1 to 18, wherein the cleaning sheet is inclined at a degree or more.
The cleaning sheet according to any one of claims 1 to 19, wherein the cellulosic fibers are hydrophilic fibers.
21. A cleaning sheet packaging body in which a laminate in which a plurality of cleaning sheets according to any one of claims 1 to 20 are laminated is contained in a packaging material.
22. The cleaning sheet package according to claim 21, wherein the packaging material includes an opening for taking out the cleaning sheet from the packaging material, and a resealable closing member for closing the opening.
The cleaning sheet package according to claim 21 or 22, wherein a plurality of the cleaning sheets 1 are stacked such that the liquid holding layer side of the cleaning sheet faces upward.