TWI646232B - Cleaning sheet - Google Patents

Abstract

The cleaning sheet (1) of the present invention is constituted by a single-layer air-laid layer (5) of a liquid holding layer (4). The airlaid layer (5) comprises a large diameter fiber (2) having a fineness of 10 to 150 dtex and a small diameter fiber having a fineness of 0.5 to 5 detx. The front end portion of the plurality of large-diameter fibers (2) is present on the surface of the air-laid layer (5), and has abrasiveness or scraping property against dirt existing on the surface of the cleaning object. There are also a plurality of front ends of the plurality of large-diameter fibers (2) on the surface opposite to the surface opposite to the air-laid layer (5) in the surface of the liquid-retaining layer (4), and the number of the fibers is less than that present in the gas flow layer (2). The number of the front ends of the large diameter fibers (2) on the surface of the layer (5).

Description

Cleaning sheet

The present invention relates to a sheet for cleaning.

The applicant first proposed a cleaning sheet comprising 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 cellulose fiber, and having a large amount on the surface. The front end portion of the thermoplastic fiber has abrasiveness or scraping property against dirt existing on the surface to be cleaned (Patent Document 1). The cleaning sheet has the following characteristics: it has sufficient abrasiveness to the dirt or scraping property.

Patent Document 2 proposes a polishing cleaning article comprising a base material, a water-soluble binder, and a peelable fixing to the base by the water-soluble binder, as another cleaning article having abrasiveness to dirt. A plurality of abrasive particles of the material. In the polishing and cleaning article, when the abrasive particles are in contact with the solvent, the particles are peeled off from the substrate.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-61885

Patent Document 2: Japanese Patent Laid-Open Publication No. 2008-529589

The cleaning sheet described in Patent Document 1 has a single scraping performance because only one of the surfaces of the sheet becomes a scraping surface of the dirt. Therefore, the scraping performance cannot be changed depending on the degree of adhesion of the dirt. Further, when the sheet is used, when the flat surface is stretched out on the opposite side to the scraping surface to assist the scraping operation, if the surface that reaches the touch surface is flat, there is The hand slides unconsciously on the face, making it difficult to perform the scraping operation.

In the polishing and cleaning article described in Patent Document 2, the water-soluble binder is dissolved by the contact of the article with the solvent, whereby the abrasive particles are peeled off from the article, and the hardness of the abrasive particles to be peeled off is used to remove the dirt, and it is necessary to remove the dirt. Use abrasive particles. Therefore, the scraping performance by the separate dirt of the sheet cannot be expected. Further, in the polishing and cleaning article described in the same document, since the abrasive particles are not released from the article in a dry state, it is necessary to use it in a wet manner. That is, when it is convenient to use in a wet state, the abrasive particles are also peeled off after the water-soluble binder is dissolved in the solvent, so that it takes a certain period of time before the abrasive particles are peeled off.

The present invention provides a cleaning sheet comprising a liquid retention layer comprising a cellulose-based fiber 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. And the airlaid layer comprises thermoplastic fibers, and the intersections of the constituent fibers are fused or followed. The airlaid layer comprises a large diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a fineness of 0.5. ~5dtex and fine fiber thermoplastic fibers having a fiber length of 2 to 15 mm, on the surface of the airlaid layer, a plurality of front ends of the above-mentioned large-diameter thermoplastic fibers are present, and have abrasiveness or scraping on the dirt existing on the surface of the cleaning object. And a plurality of the front ends of the plurality of the large-diameter thermoplastic fibers are present on the surface of the liquid-retaining layer opposite to the surface opposite to the air-laid layer, and the number of the ends is less than that present in the airflow The number of the front ends of the above-mentioned large diameter thermoplastic fibers on the surface of the mesh layer.

1‧‧‧Sweeping sheet

2‧‧‧Rough fiber

2A‧‧‧ front end of large diameter fiber

3‧‧‧Hydrophilic fiber

4‧‧‧Liquid retention layer

5‧‧‧Air layer

5A‧‧‧Surface area

6‧‧‧Abrasive particles

7‧‧‧ convex

8‧‧‧ recess

9‧‧‧Making the intersection of the large diameter fibers followed by the adhesive or fusion site

10‧‧‧ Manufacturing equipment

11‧‧‧1st head

12‧‧‧2nd head

13‧‧‧Circular conveyor belt

14‧‧‧Brush roller

21‧‧‧1st inhalation box

22‧‧‧2nd inhalation box

C‧‧‧Sweeping surface

D‧‧‧ dirt

D‧‧‧1 direction

Fig. 1 is a perspective view schematically showing an embodiment of a cleaning sheet of the present invention.

Fig. 2 is a schematic view showing a cross-sectional structure of the cleaning sheet shown in Fig. 1;

Fig. 3 is a schematic enlarged view showing a main part of the cross-sectional structure shown in Fig. 2.

Fig. 4 is a schematic view showing a dirt removing mechanism of the cleaning sheet shown in Fig. 1;

Fig. 5 is a schematic view showing an apparatus which can be preferably used for manufacturing the cleaning sheet shown in Fig. 1.

Fig. 6 (a) is a schematic view showing a cross-sectional structure of another embodiment of the cleaning sheet of the present invention, and Fig. 6 (b) is an enlarged view showing a main portion of the cross-sectional structure shown in Fig. 6 (a). Figure.

Hereinafter, the present invention will be described based on preferred embodiments thereof with reference to the drawings. The cleaning sheet 1 of the embodiment shown in Figs. 1 and 2 is a cleaner which can be preferably used for a hard surface. The cleaning sheet 1 is a dry type, and does not substantially contain a liquid component such as a cleaning liquid. The term "substantially free" means that the ratio of the liquid component to the cleaning sheet 1 is 3% by mass or less. The cleaning sheet 1 has a liquid retaining 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 retaining layer 4 and the airlaid web 5. However, it does not hinder the interposition of other layers between the liquid retaining layer 4 and the airlaid layer 5, and may be interposed between the liquid retaining layer 4 and the airlaid layer 5 depending on the specific use of the cleaning sheet 1 or the like. Set other layers. The liquid retaining layer 4 and the airlaid layer 5 are laminated and integrated. As a method of integration, for example, various methods 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 retaining layer 4 and the airlaid layer 5, the cleaning sheet 1 is constituted by the surface of the liquid retaining layer 4 on one side and the airlaid layer 5 on the other side. Surface composition.

The liquid retaining layer 4 is a layer that can achieve absorption and retention of moisture. On the other hand, the airlaid layer 5 has a layer which has a scraping property against dirt. In this sense, in the following description, the airlaid layer is also referred to as a "scraping layer". The liquid retaining layer 4 is composed of cellulose fibers and fibers. A heat-fusible fiber having a degree of 0.5 to 5 dtex and a fiber length of 2 to 15 mm. The airlaid layer 5 is a layer comprising thermoplastic fibers and the constituent fibers of the web formed by the air flow method are fused to each other or via a binder.

In the cleaning sheet 1, the surface of the scraping layer 5 may have a concavo-convex structure. For example, as shown in FIG. 1, a diamond-shaped lattice-like recess 8 may be formed by performing a diamond-shaped grid-like heating embossing process on the surface of the scraping layer 5. The recess 8 contains a fusion portion having a higher density than its surroundings. The region surrounded by the rhombic lattice-shaped recess 8 becomes a non-embossed region including the convex portion 7. The non-embossed regions comprise a non-fused portion having a lower density than the recess. The concave portion 8 is more compacted than the non-embossed region including the convex portion 7 by applying heat and pressure generated by heat embossing. That is, the recess 8 is denser than the non-embossed area. This heating embossing process can be used to bond the scraping layer 5 and the liquid retaining 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 the rhombic lattice shape, and may be any shape such as a line shape, a dot shape, or a specific pattern. The total area of the concave portion 8 is preferably 5% or more, and particularly preferably 10% or more, with respect to the area of the cleaning surface of the cleaning sheet 1. Further, it is preferably 50% or less, and particularly preferably 40% or less. Specifically, the total area of the concave portion 8 is preferably 5% or more and 50% or less with respect to the area of the cleaning surface of the cleaning sheet 1, and more preferably 10% or more and 40% or less (hereinafter, this value is called The area ratio of the concave portion 8). By setting the area ratio of the concave portion 8 within the range, the surface strength and the cleaning property at the time of cleaning can be smoothly achieved at the same time.

The cleaning sheet 1 may have a perforation line (not shown). By cutting the cleaning sheet 1 along the perforation line, the cleaning sheet 1 can be subdivided and cut to a size that is easy to use. The pattern shape of the perforation line is not particularly limited as long as the cleaning sheet 1 can be subdivided into a size or shape that is easy to use.

The scraping layer 5 which is one layer of the cleaning sheet 1 contains a large-diameter thermoplastic fiber (hereinafter also referred to as "thick diameter fiber") 2 which is one of the above-mentioned thermoplastic fibers. 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. Denier Since this fiber has a high rigidity due to the fiber, it is sufficiently high in scraping off the dirt. From this point of view, the fineness of the large-diameter fiber 2 is preferably 10 dtex or more, more preferably 20 dtex or more, and particularly preferably 30 dtex or more. Further, it is preferably 150 dtex or less, more preferably 130 dtex or less, and particularly preferably 120 dtex or less. Specifically, as described above, the fineness of the large-diameter 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 still more preferably 30 dtex or more and 120 dtex or less. By using the large-diameter fibers 2 of this range, the cleaning sheet 1 is excellent in scraping property such as adhesion to dirt in a pan or a frying pan, and adhesion to dirt in a kitchen environment or a wading environment. Regarding the cleaning sheet 1, the front end portion of the plurality of large-diameter fibers 2 is present on the surface of the scraping layer 5, and exhibits abrasiveness or scraping property against the dirt existing on the surface to be cleaned.

The large diameter fiber 2 is also preferably a short fiber. Thereby, the large-diameter fiber 2 becomes hard to bend, and rigidity is also improved. Further, as described below, by using the short fibers as the large-diameter fibers 2, the scraping layer 5 can be smoothly formed by the air flow method. 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 still more preferably 4 mm or more. Further, it is preferably 15 mm or less, more preferably 8 mm or less, and still more preferably 6 mm or less. Specifically, the fiber length of the large-diameter 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 still more preferably 4 mm or more and 6 mm or less. By using the fiber length in this range, the rigidity of the large-diameter fiber 2 can be sufficiently improved. Further, it is possible to effectively prevent the large-diameter fibers 2 from falling off from the scraping layer 5. Further, the scraping layer 5 can be smoothly formed by the air flow method.

The large-diameter fiber 2 is preferably contained in the cleaning sheet 1 in an amount of 10% by mass or more from the viewpoint of exhibiting sufficient scraping performance for the dirt. The ratio of the large-diameter fibers 2 to the cleaning sheet 1 is 30% by mass or more, and particularly 50% by mass or more, and the scraping performance is further improved. The ratio of the large diameter fiber 2 to the cleaning sheet 1 is preferably 90% by mass or less. Specifically, the ratio of the large-diameter fiber 2 to the cleaning sheet 1 is more preferably 10% by mass or more and 90% by mass or less, and still more preferably 30% by mass or more and 90% by mass. Hereinafter, it is more preferably 50% by mass or more and 90% by mass or less.

As the large-diameter fiber 2, for example, a polyolefin resin such as polyethylene or polypropylene, a polyester resin such as polyethylene terephthalate, an acrylic resin such as polyacrylic acid or polymethacrylic acid, or polyvinyl chloride can be used. A fiber such as a vinyl resin, a polyamide resin such as nylon, or a metal, glass, mineral or the like as a raw material. In the case of using the resin-made large-diameter fiber 2, the resin hardness thereof is preferably in the range of R40 to R150 in terms of Rockwell hardness. In particular, in terms of improving the scraping property of the dirt, it is preferred to use a resin of R80 to R150. A composite fiber (core-sheath type composite fiber or side-by-side type composite fiber) containing a combination of two kinds of resins among the above various raw materials may also be used. In particular, the large-diameter fiber 2 is preferably an acrylic fiber, a polyester fiber, a vinyl chloride fiber, or a polymer which is non-destructive to the surface to be cleaned (stainless steel, tile, enamel, artificial marble, etc.) and excellent in scraping property. Amidamide fiber and polyolefin fiber. Further, in terms of preventing the fibers from falling off, it is also preferred to use a heat-fusible fiber. As the heat-fusible fiber, for example, a heat-fusible composite fiber comprising a low melting point resin having a different melting point and a high melting point fiber, and the low melting point resin forming at least a part of the surface of the fiber is preferably used. As a combination of a low melting point resin/high melting point resin, high density polyethylene/polypropylene, low density polyethylene/polypropylene, polypropylene/ethylene can be exemplified. Butene-1 crystalline copolymer, high density polyethylene/polyethylene terephthalate, nylon-6/nylon-66, low melting point polyester/polyethylene terephthalate, polypropylene/poly pair Ethylene phthalate and the like.

The form of the heat-fusible composite fiber is a side-by-side type, a sheath core type, an eccentric sheath core type, a multilayer type of three or more layers, a hollow side-by-side type, a hollow sheath core type, a profiled sheath core type, an island type, and the like, and a low melting point resin. It suffices to form at least a part of the surface of the fiber. Preferably, the above heat-fusible composite fiber is selected from the group consisting of high density polyethylene, linear low density polyethylene, and ethylene. Any one of a low melting point polyester such as a butene-1 crystalline copolymer, a polyethylene terephthalate, and a polyethylene terephthalate copolymerized polyester as a low melting point resin Propylene or polyethylene terephthalate is used as a conjugate fiber of a high melting point resin, a sheath core type, and an eccentric sheath core type. Especially the scraping of dirt becomes good In terms of the aspect, it is preferred to use a composite fiber of a low melting point polyester and polyethylene terephthalate.

As the large diameter fiber 2, a crimping property can also be used. Thereby, the thickness feeling (fluffiness) of the cleaning sheet 1 can be improved, and a good wiping feeling can be obtained. As the crimped form, there are a spiral type, a zigzag type, a U shape, and the like, and these can be preferably used.

One type or two or more types of the large diameter fibers 2 can be used. In the case where the cleaning sheet 1 contains two or more kinds of fibers, it is preferable to include a large-diameter fiber satisfying the above-described fiber length and fineness so as to satisfy the above content in total.

In the scraping layer 5, as one of the thermoplastic fibers, a fine-diameter thermoplastic fiber having a fineness smaller than that of the large-diameter fiber 2 (not shown. Hereinafter also referred to as "fine-diameter fiber") is also included. The fine fiber is preferably a fineness of 0.5 dtex or more, and more preferably 1 dtex or more, as a condition that the fineness is smaller than the large diameter fiber 2. Further, it is preferable to use a fineness of 5 dtex or less, and particularly preferably 3 dtex or less. Specifically, it is preferable to use a fiber having a fineness of 0.5 dtex or more and 5 dtex or less, and more preferably 1 dtex or more and 3 dtex or less. The ratio of the fine fibers to the scraping layer 5 is preferably 1% by mass or more, more preferably 5% by mass or more, and is preferably 50% by mass or less, and particularly preferably 30% by mass or less. Specifically, the ratio of the fine fibers to the scraping layer 5 is preferably 1% by mass or more and 50% by mass or less, and particularly preferably 5% by mass or more and 30% by mass or less. In the scraping layer 5, fine-diameter fibers are contained in addition to the large-diameter fibers 2, whereby the abrasiveness or scraping property of the scraping layer 5 can be maintained and the basis weight thereof can be reduced.

The fine fiber is preferably a short fiber similarly to the large diameter fiber 2. In this case, the fiber length of the fine 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 still more preferably 6 mm or less. Specifically, the fiber length of the small-diameter 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. Further, the fine fiber is preferably composed of a thermoplastic resin of the same kind or different kind as the large diameter fiber 2. It is especially preferred that the fine fibers are composed of heat fusible fibers.

In the scraping layer 5, the intersections of the constituent fibers are joined. Specifically, 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. Further, the plurality of large-diameter fibers 2 stand up, and the front end portion thereof is present on the surface of the scraping layer 5. When the large-diameter fiber 2 stands up, it means that the longitudinal direction of the large-diameter fiber 2 (the direction orthogonal to the fiber cross-section) is set to 0 degree with respect to the in-plane direction of the scraping layer 5 (the fiber is not inclined without being inclined) The angle formed by the in-plane direction and the longitudinal direction of the large-diameter fiber 2 is preferably 30 degrees or more, and more preferably 45 degrees or more. One end of the large-diameter fiber 2 can be seen from the surface side on the surface of the scraping layer 5 by the thick-diameter fiber 2 standing up. The large-diameter fiber 2 contained in the scraping layer 5 is preferably raised in the large-diameter fiber 2 by 50% or more, and more preferably 80% or more. In particular, the coarse-diameter fibers 2 are joined to each other at the intersection of the fibers, and the front end portion of the large-diameter fibers 2 is present on the surface of the scraping layer 5, thereby imparting sufficient abrasiveness or scraping property to the scraping layer 5. In this case, it is not necessary to allow the front end portions of all the large-diameter fibers 2 constituting the scraping layer 5 to exist on the surface of the scraping layer 5 as long as it exhibits a sufficient degree of scraping performance.

In order to allow the front end portion of the large-diameter fiber 2 to exist on the surface of the scraping layer 5, it is advantageous to form the scraping layer 5 by a gas flow method. Specifically, the large-diameter fibers 2 including the short fibers and the fine-diameter fibers including the short fibers are stacked by a gas flow method to form a fiber web, and the fibers of the fiber web are joined to each other, whereby the large-diameter fibers 2 are The front end portion is easily present on the surface of the scraping layer 5. As a method of joining the intersections of the fibers, for example, adhesion with an adhesive or thermal fusion can be used.

The basis weight of the scraping layer 5 is preferably 20 g/m ² or more, more preferably 30 g/m ² or more, and is preferably 200 g/m ² or less, and particularly preferably 150 g/m ² or less. Specifically, 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 to this range, it is preferable that the cleaning sheet 1 further improves the dirt removal property of the adhered dirt in the kitchen environment or the wading environment.

The scraping layer 5 has a space between the fibers constituting it. The space consists of a large diameter The space in which the fibers 2 are formed, the space in which the fine fibers are formed, and the 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 if subjected to an external force. As shown in Figure 3, a plurality of abrasive particles 6 may be present in the space. The abrasive particles 6 are present in the space, and even if the abrasive particles 6 are in contact with the fibers, they may be present without being fixed by an adhesive or the like. Further, in Fig. 3, reference numeral 9 denotes an adhesive or a fusion portion where the intersection of the large diameter fibers 2 is followed. The abrasive particles 6 can be used to improve the abrasive performance of the scraping layer 5 by the synergistic effect with the scraping property of the large diameter fibers 2. The abrasive particles 6 are preferably present in the space freely from the scraping layer 5. In the state in which the abrasive particles 6 are detached, the abrasive particles 6 are present in the scraping layer 5 in such a manner that the cleaning sheet 1 is vibrated in a state where the cleaning sheet 1 is not wetted. When an external force is generated by bending or the like, at least a part of the abrasive particles 6 are detached from the scraping layer 5 of the cleaning sheet 1. Therefore, the abrasive particles 6 are different from the technique described in Patent Document 2 described in the prior art, for example, and are not bonded to the fibers by the bonding agent. In particular, unlike the technique described in Patent Document 2, the abrasive particles are easily detached by an external force such as vibration in a dry state, and are not detached after contact with water or an aqueous solution. A specific method for causing the abrasive particles 6 to be present in the scraping layer 5 in this manner will be described later.

In the cleaning sheet 1, the following method using the measured off quantity of the abrasive particles 6 (g / m ²⁾ with respect to the amount of the abrasive particles before the fall of 6 (g / m ^2), is preferably 0.1% or more, Further, it is preferably 0.3% or more, more preferably 3.0% or less, still more preferably 2.0% or less. Specifically, the amount of the abrasive particles 6 to be detached (g/m ² ) is preferably 0.1% or more and 3.0% or less, and more preferably 0.3%, based on the amount (g/m ² ) of the abrasive particles 6 before detachment. Above and below 2.0%.

[Amount of abrasive particles falling off]

The extent to which the abrasive particles 6 are detached from the scraping layer 5 can be measured by the following method. The cleaning sheet 1 was cut into a rectangle of 10 cm × 7 cm to obtain a test piece. The test piece was placed in an environment of 20 ° C ± 5 ° C with the short side of 7 cm as the upper side, held by both hands and cut along the length of 10 cm, and the splitting speed at this time was set to 5 cm / sec. The material which was separated by the splitting was collected, and the mass (g) thereof was measured, and this was converted into 1 m ² , and the amount of the abrasive particles 6 was dropped (g/m ² ).

The abrasive particles 6 are preferably uniformly present throughout the entire thickness direction of the scraping layer 5. However, it is advantageous to have substantially no abrasive particles 6 in the surface region 5A including the outermost surface of the scraping layer 5. The surface region 5A is a region in the surface thickness direction formed by an aggregate of the respective distal end regions 2A 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 the tip end portion present on the surface of the scraping layer 5 substantially do not adhere to the abrasive particles 6 in the end region 2A including the tip end portion. The term "substantially non-adhering" means that when the front end region of the large diameter fiber 2 is enlarged (50 ± 5 times), five large diameter fibers are selected, and the abrasive particles 6 are observed in the front end region of the large diameter fiber. The number of the abrasive particles 6 observed for the selected large-diameter fiber 2 with respect to the central portion in the thickness direction of the scraping layer 5 is 10% or less. The central portion in the thickness direction refers to a central portion when the scraping layer 5 is equally divided in the thickness direction thereof. Since the abrasive particles 6 are present 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 quickly and largely released to the surface to be cleaned. As a result, the dirt can be easily and quickly removed. When the abrasive particles 6 are present on the outermost surface of the scraping layer 5, the abrasive particles 6 present on the outermost surface of the scraping layer 5 are wetted when the surface of the cleaning target is wet, and it becomes difficult to fall off from the scraping layer 5. . As a result, it is difficult for the abrasive particles 6 to be quickly supplied to the cleaning target surface. The front end region is a region having a depth which is within 5 times the diameter of the large diameter fiber 2 from the front end portion.

The mass of the abrasive particles 6 with respect to the scraping layer 5 is preferably 150% by mass or more, and particularly preferably 200% by mass or more. Further, the mass of the scraping layer 5 is preferably 900% by mass or less, and particularly preferably 750% by mass or less. Specifically, the mass of the abrasive particles 6 with respect to the scraping layer 5 is preferably 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. By grinding particles 6 to the van The ratio of the circumference is present in the scraping layer 5, and the polishing property of the scraping layer 5 is further improved by the synergistic effect with the scraping property of the large diameter fiber 2.

As the abrasive particles 6, it is preferred to use water-insoluble particles. The abrasive particles 6 preferably have a Mohs hardness of 3 or more and 7 or less in terms of abrasiveness. Examples of such abrasive particles 6 include calcium carbonate, zeolite, and cerium oxide ( vermiculite powder). These abrasive particles 6 may be used singly or in combination of two or more. The abrasive particles 6 preferably have an average particle diameter of 5 μm or more, and more preferably 10 μm or more. Further, it is preferably 50 μm or less, and particularly preferably 40 μm 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 diameter and have a particle size distribution. By using the abrasive particles 6 having the hardness and the average particle diameter in this range, it is possible to effectively prevent the surface of the cleaning target from being damaged and obtain a sufficient polishing effect.

The average particle diameter of the abrasive particles 6 was measured by a resistance test method (Coulter counter method).

The scraping layer 5 may contain other cleaning components in addition to the polishing particles 6 described above. For example, in order to improve the cleaning effect on dirt, various surfactants can be used. Specifically, an anionic surfactant such as an alkylbenzenesulfonic acid or a nonionic surfactant such as a polyoxyethylene alkyl ether can be used. Further, in order to improve 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 the like may be used. Salt and so on.

The abrasive particles 6 can be present in the scraping layer 5, for example, by the method described below. First, a cleaning sheet to which the abrasive particles 6 are applied is prepared. By "giving" is meant coating to cause abrasive particles to be present in the scraping layer. A specific manufacturing method of the cleaning sheet 1 in a state before the polishing particles 6 are carried out will be described later. In addition to this preparation, a slurry containing the abrasive particles 6 is additionally prepared. As a liquid medium for the slurry, it is relatively simple to use water. Specific examples of the slurry are described in, for example, Japanese Patent Laid-Open No. 2006-104264 or Japanese Patent Laid-Open Bulletin No. 2006-104265. In terms of the dispersion of the abrasive particles 6, a small amount of a surfactant may be contained in the slurry. In this case, the surfactant is preferably contained in an amount of preferably 20% by mass or less, and more preferably 10% by mass or less based on the mass of the slurry. The surfactant may also be contained in the slurry, and more preferably it is not contained. The slurry 6 is peelably held between the fibers without being fixed to the fibers of the scraping layer 5 because the slurry contains a small amount or no surfactant, and after the slurry is applied and dried. The term "unfixed" means that the abrasive particles 6 are not fixed to the fibers by adhesion or fusion, and even if a solvent such as an aqueous solution is not used, all or a part of the abrasive particles 6 are detached from the scraping layer 5 by applying vibration or the like. .

Among the cleaning sheets in the state before the abrasive particles 6 are applied, the slurry is applied to the scraping layer 5. For example, a die coater or a gravure roll coater can be used for coating. By this coating, a coating film containing the wet state of the abrasive particles 6 is formed in the scraping layer 5. While the coating film is in a wet state, the smooth surface member 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 region 5A of the scraping layer 5. As a result, the abrasive particles 6 are substantially absent from the surface region 5A including the outermost surface of the scraping layer 5. Thereby, the large-diameter fiber 2 having the tip end portion present on the surface of the scraping layer 5 substantially does not adhere to the abrasive particles 6 in the end region 2A including the tip end portion. In the present invention, as described above, the front end region is a region (the region indicated by symbol 2A in Fig. 3) which is within 5 times the diameter of the fiber having a large diameter at the tip end portion.

As the member for the above-mentioned pressing, for example, a film made of a synthetic resin, a metal plate, a natural fiber thread, a synthetic fiber thread or the like can be used. Among these, a film made of a synthetic resin is particularly preferable.

By the above 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 by a wiping member. By this wiping, the abrasive particles 6 are less likely to exist in the surface region 5A including the outermost surface of the scraping layer 5. As the wiping member, for example, various types can be used. A fiber sheet such as a woven fabric or a woven fabric, a brush using a synthetic resin fiber, or a brush using a natural fiber.

Next, the liquid holding layer 4 of the cleaning sheet 1 will be described. The liquid retaining layer 4 is a layer that achieves absorption and retention of water. In order to achieve the object, the liquid retaining layer 3 preferably comprises a hydrophilic fiber 3. As the hydrophilic fiber, for example, a cellulose-based fiber can be preferably used. As an example, a pulp fiber, a cotton fiber, a ray fiber, etc. are mentioned, and it is especially preferable to use a pulp fiber. As the cellulose-based fiber, it is particularly preferable to use a pulp fiber derived from a conifer in terms of preventing the peeling of the hydrophilic fiber 3 and exhibiting an appropriate sheet strength.

The fiber length of the hydrophilic fiber 3 contained in the liquid retaining layer 4 can be selected to an appropriate length depending on the method of producing the liquid retaining layer 4. When the liquid retaining layer 4 is produced by, for example, an air flow method, the fiber length of the hydrophilic fiber 3 is preferably 0.1 mm or more and 15 mm or less, and more preferably 0.3 mm or more and 10 mm or less. In the case of the air flow method, the intersections of the fibers are fused or joined by subsequent bonding. In the next case, any adhesive can be used. Specific examples of the binder include acrylonitrile-butadiene rubber.

The ratio of the hydrophilic fiber 3 to the cleaning sheet 1 is preferably 10% by mass or more, and more preferably 20% by mass or more. Further, it is preferably 90% by mass or less. Specifically, the ratio of the hydrophilic fibers 3 to the cleaning sheet 1 is preferably 10% by mass or more and 90% by mass or less, and particularly preferably 20% by mass or more, in terms of the absorbability of the liquid. And 90% by mass or less. The liquid-retaining layer 4 preferably contains a heat-fusible fiber having a fineness of 0.5 dtex or more and 5 dtex or less, particularly 1 dtex or more and 3 dtex or less, and a fiber length of 2 mm or more and 15 mm or less, particularly 3 mm or more and 8 mm or less. A fiber other than the hydrophilic fiber 3. The heat-fusible fiber is preferably contained in the liquid-retaining layer 4 in an amount of 10% by mass or more and 90% by mass or less, and more preferably 10% by mass or more and 80% by mass or less. As the heat-fusible fiber, for example, a polyolefin fiber having a low melting point, a polyester fiber, a low melting point resin and a high melting point resin as described above and a low melting point resin can be used to form a fiber surface. A part of the composite fiber or the like.

The basis weight of the liquid retaining layer 4 is preferably 30 g/m ² or more, more preferably 40 g/m ² or more, and is preferably 100 g/m ² or less, and particularly preferably 80 g/m ² or less. Specifically, the basis weight of the liquid retaining 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 retaining layer 4 to this range, the absorption and retention of the dirty liquid can be sufficiently performed. Moreover, the total basis weight of the cleaning sheet 1 including the scraping layer 5 and the liquid retaining layer 4 is preferably 50 g/m ² or more and 300 g/m ² or less.

In the cleaning sheet 1, the front surface of the plurality of large-diameter fibers 2 is also present on the surface 4a opposite to the surface facing the scraping layer 5 on the surface of the liquid holding layer 4, and the surface portion of the large-diameter fiber 2 is present. The abrasive or scraping property of the dirt. In other words, each surface of the cleaning sheet 1 has abrasiveness or scraping property against dirt existing on the surface to be cleaned. However, the number of the ends of the large-diameter fibers 2 present on the surface of the scraping layer 5 is different from the number of the ends of the large-diameter fibers 2 present on the surface of the liquid-retaining layer 4. In detail, if the number of the ends of the large diameter fibers 2 present on the surface of the scraping layer 5 is compared with the number of the large diameter fibers 2 of the surface of the liquid holding layer 4, a liquid holding layer is preferable. The number of the large diameter fibers 2 on the surface of the surface 4 is less than the number of the front ends of the large diameter fibers of the surface of the scraping layer 5. Regarding the scraping performance of the dirt, as long as the types of the large-diameter fibers 2 are the same, depending on the number of the front end portions, in the present embodiment, the scraping property of the scraping layer 5 and the scraping property of the liquid retaining layer 4 are eliminated. Performance is different. In detail, the scraping property of the scraping layer 5 is higher than that of the liquid retaining layer 4. Thereby, the surface of the appropriate layer in the scraping layer 5 or the liquid retaining layer 4 is used for cleaning depending on the degree of adhesion of the dirt. Further, the front end portion of the large-diameter fiber 2 is also present on the surface opposite to the surface on which the dirt is scraped off, and the function of preventing the hand slip is caused by the frictional force generated at the front end portion of the large-diameter fiber 2, so that the scraping is performed. In addition to the improved operability. From the viewpoint of making the advantageous effects more remarkable, the number of the large diameter fibers 2 on the surface of the liquid retaining layer 4 is preferably the number of the front ends of the large diameter fibers of the surface of the scraping layer 5. 0.1% or more, further preferably 0.3% or more, and still more preferably 0.5% or more. Moreover, the large diameter fiber of the surface of the liquid retaining layer 4 The number of the dimension 2 is preferably 20% or less, more preferably 15% or less, still more preferably 10% or less, of the number of the ends of the large diameter fibers of the surface of the scraping layer 5. Specifically, the number of the large-diameter fibers 2 on the surface of the liquid-retaining layer 4 is preferably 0.1% or more and 20% or less of the number of the ends of the large-diameter fibers on the surface of the scraping layer 5, and more preferably 0.3% or more and 15% or less, and more preferably 0.5% or more and 10% or less.

The number of the ends of the large diameter fibers of the surface of the scraping layer 5 and the liquid holding layer 4 was measured by the following method. The cleaning sheet 1 was cut into a rectangle of 10 cm × 1 cm to obtain a test piece. The cut surface of the side of the side of the test piece was set to the front side, and the surface of the cleaning sheet 1 was inclined by 10 degrees from the front side, and the surface of the cleaning sheet was observed by a mechanism such as a magnifying glass from the oblique direction. The number of the large-diameter fibers which were raised from the surface of the sheet 1 for cleaning to be observed at an angle of 25 degrees or more was measured. The measurement result is divided by 10, the number of resulting value is set to the large diameter of the distal end portion of the fiber present (root / cm ^2). When it is not possible to cut out a test piece of a predetermined size, a test piece of any size can be prepared, and the surface area can be calculated, and then the number of pieces per unit area can be calculated based on the result measured by the same method, and it is made thick. The number of the front ends of the diameter fibers (root/cm ² ).

The number of the ends of the large-diameter fibers 2 present on the surface of the scraping layer 5 is a sufficient number to express sufficient abrasiveness or scraping property to the dirt present on the surface of the cleaning target, preferably of 20 / cm ² or more, further preferably 50 / cm ² or more, and further more preferably 100 / cm ² or more, particularly preferably 120 / cm ² or more, and, of 4000 / cm ² or less, Further, it is preferably 2,000 pieces/cm ² or less, more preferably 1,000 pieces/cm ² or less, and still more preferably 600 pieces/cm ² or less. Specifically, it is 20 pieces/cm ² to 4000 pieces/cm ² , more preferably 50 pieces/cm ² to 2000 pieces/cm ² , and still more preferably 100 pieces/cm ² to 1000 pieces/cm ² , especially Preferably, it is 120 pieces/cm ² to 600 pieces/cm ² .

On the other hand, the number of the ends of the large-diameter fibers 2 present on the surface of the liquid retaining layer 4 is preferably from the viewpoint of exhibiting sufficient friction with the hand or gently removing the adhered dirt. It is 0.1 / cm ² or more, and further preferably 1 / cm ² or more, and further more preferably 5 / cm ² or more, particularly preferably 10 / cm ² or more. Further, it is preferably 100 pieces/cm ² or less, more preferably 60 pieces/cm ² or less, still more preferably 50 pieces/cm ² or less, and still more preferably 40 pieces/cm ² or less. Specifically, it is 0.1/cm ² or more and 100 pieces/cm ² or less, more preferably 1 piece/cm ² or more and 60 pieces/cm ² or less, and still more preferably 5 pieces/cm ² or more and 50 pieces. /cm ² or less is particularly preferably 10 pieces/cm ² or more and 40 pieces/cm ² or less.

When one large diameter fiber 2 is focused, one end portion of the large diameter fiber 2 may exist on the surface of the scraping layer 5, and the other front end portion may exist on the surface of the liquid holding layer 4. Alternatively, the large-diameter fiber 2 may have a front end portion present on the surface of the scraping layer 5, and the other front end portion may be present inside the scraping layer 5 or inside the liquid retaining layer 4. Alternatively, the large-diameter fiber 2 may have a front end portion present on the surface of the liquid retaining layer 4, and the other front end portion may be present inside the liquid retaining layer 4 or inside the scraping layer 5. Therefore, a part of the large-diameter fiber 2 exists not only in the scraping layer 5 but also in the liquid retaining layer 4.

The cleaning sheet 1 is a dry type in the state before use as described above. It can be kept dry during use or it can be moistened and used. When it is used for being wetted, it can be cleaned in the following order: the surface of the cleaning object, for example, a hard surface is wetted with water in advance, and the hard surface in the wet state is cleaned by the scraping layer 5, and then wiped by the liquid holding layer 4 Moisture on the hard surface in a wet state, that is, a dirt containing dirt. Since the surface of the liquid retaining layer 4 also has a scraping property against dirt, the hard surface can be further cleaned while wiping the dirty liquid.

The soil removing means for the cleaning sheet 1 is used, for example, to wet it, as described below. The hard surface is wetted with water in advance, and the surface of the cleaning sheet 1 on the side of the scraping layer 5 is pressed against the hard surface in a wet state, and wiped. Thereby, as shown in FIG. 4, the abrasive particle 6 is released from the scraping layer 5, and is supplied to the cleaning target surface C. The released abrasive particles 6 and a large amount of the large-diameter fibers 2 present on the surface of the scraping layer 5 are ground or scraped off the dirt D present on the cleaning target surface C. By these actions, the dirt D is removed from the cleaning target surface C. The removed dirt D is dissolved or dispersed in water and absorbed together with water to the liquid The body retains layer 4. In this way, the cleaning target surface C is in a clean state.

In the cleaning sheet 1, it is preferable that the air permeability T _{VD in the} vertical thickness direction is smaller than the air permeability T _{MD in the in-} plane direction. Further, the liquid is preferably maintained perpendicular to the thickness direction of the air permeability of the layer 4 of the T _VD is less than the vertical air permeability in the thickness direction of the layer 5 of the blade T _VD. Thereby, the abrasive particles 6 are held between the fibers of the scraping layer 5, and the abrasive particles 6 do not penetrate into the liquid retaining layer 4 side and remain in the scraping layer 5, and are polished without adding a liquid medium such as water during cleaning. The particles 6 are also easily released to the surface of the cleaning object. By controlling the air permeability in this manner, the penetration of the abrasive grains 6 is prevented. Therefore, it is preferable that the abrasive particles 6 are present relatively close to the back side of the scraping layer 5 in the thickness direction of the cleaning sheet 1 ( The position of the liquid retaining layer 4) is relatively small or absent on the surface side (cleaning surface side). In order to control the ratio of the air permeability in the vertical direction and the in-plane direction, for example, it is only necessary to control the degree of standing up of the constituent fibers. By erecting the constituent fibers, the air permeability in the vertical direction is increased, and the air permeability in the in-plane direction is lowered.

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

In the cleaning sheet 1, for example, a plurality of sheets can be laminated in a regular manner to form a laminate, and the laminate can be accommodated in a packaging material to form a cleaning sheet package. Preferably, the packaging material includes an opening for taking out the cleaning sheet 1 from the packaging material, and a resealable sealing member that closes the opening. In the laminated body, for example, a plurality of sheets for cleaning 1 are regularly deposited so that the side of the liquid holding layer 4 of the cleaning sheet 1 faces upward. It is preferable that the laminated body in this state is housed in the packaging material so that the side of the liquid holding layer 4 faces the opening side. By using such a storage state, when the cleaning sheet 1 is pinched with a finger and taken out from the packaging material, the irritating feeling of the finger (the sensation of the finger at the front end of the thick-diameter fiber 2 which stands up) It is better, so it is better. The reason is that when the cleaning sheet 1 is pinched with a finger and taken out from the packaging material, the finger pad only has the front end of the large diameter fiber 2 The layer having a relatively small number of layers, that is, the liquid retaining layer 4 is in contact with each other, and the scraping layer 5 which gives a pungent feeling of puncturing is not easily contacted with the finger pad. In order to easily discriminate the side of the liquid retaining layer, it is preferable to clearly show the scraping side or mark the mark in advance.

In terms of the protection of the contents, the packaging material is preferably another package that is internally sealed to other packaging materials having openings or hooks at the peripheral portion. The openings or hooks of other packages are designed to suspend other packages. Regarding the other package, it is advantageous in that it can be easily hung by the opening or the hook when it is displayed on the storefront. Moreover, the other package can also be resealable.

The packaging material may be provided with openings or hooks directly on the peripheral portion without using other packaging materials. Moreover, the packaging material can also be resealable.

As another packaging aspect of the cleaning sheet 1, an individual package in which the cleaning sheet 1 is housed in a packaging material and individually packaged is used. Regarding the individual package, the cutting line or the perforation line can also be incorporated for easy opening. Preferably, openings or hooks are provided in the peripheral portion of the individual packaging material. The opening or hook is designed to suspend individual packages. Regarding the individual package, it is advantageous in terms of being easily displayed by the opening or the hook when it is displayed on the storefront. Further, a plurality of individual packages are arranged in a row, and the first individual package can be suspended by the opening or the hook, and the fifth and subsequent separations of the seam lines or the perforation lines can be performed after the second one. Hang in the store, separate and sell.

In the packaging form of the cleaning sheet 1 , the cleaning sheet formed in the long cleaning sheet 1 is wound into a roll and placed in a packaging sheet. In the package, cutting assist processing such as a cutting line or a perforation line in the entire width direction is performed every predetermined length of the cleaning sheet, thereby making it easier to use.

The cleaning sheet 1 of the present embodiment can be produced by the following method in accordance with the method described in JP-A-2003-61885.

<Method 1>

The liquid retaining layer 4 is formed by fusing the constituent fibers of the fiber web including the cellulose fibers and formed by the air flow method to each other or by a binder. Further, in addition to the formation of the liquid retaining layer 4, the constituent fibers including the large-diameter fibers and the fine-diameter fibers and formed by the air flow method are fused to each other or formed by an adhesive, thereby forming an air-laid network. The layer is scraped off layer 5. Further, on one side of the liquid retaining layer 4, the scraping layer 5 is laminated and integrated.

<Method 2>

a fiber web formed by a gas flow method and a fiber web formed by a gas flow method on a single side of a fiber web comprising a cellulose fiber and formed by a gas flow method, so that the constituent fibers of each fiber web intersect each other The liquid retaining layer 4 and the scraping layer are formed by fusion between the two webs or by a binder, and the liquid retaining layer 4 is integrated with the scraping layer 5.

In the above method 1 and method 2, in order to allow the front end of the large diameter fiber to exist on the surface of the liquid holding layer 4, for example, the following manufacturing conditions may be employed. That is, when the cellulose-based fiber is contained and the fiber web is formed by the air flow method, a small amount of the large-diameter fiber is contained, and the large-diameter fiber is blended in the liquid retaining layer 4.

The following method 2A can also be employed as a variation of the above method 2.

<Method 2A>

The liquid retaining layer 4 is formed by fusing a constituent fiber comprising a cellulose fiber, a fine fiber, and a large diameter fiber and forming a fiber web formed by a gas flow method to each other or by a binder. Further, in addition to the formation of the liquid retaining layer 4, the constituent fibers including the large-diameter fibers and the fine-diameter fibers and formed by the air flow method are fused to each other or formed by an adhesive, thereby forming an air-laid network. The layer is scraped off layer 5. Further, on one side of the liquid retaining layer 4, the scraping layer 5 is laminated and integrated. This method can be carried out 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 is wound in a direction D. The conveyor belt 13 is composed of a material having air permeability. The conveyor belt 13 is made of, for example, a mesh belt made of metal. Composition. Above the conveyor belt 13, a first head portion 11 and a second head portion 12 for supplying fibers are provided along the circumferential direction D of the conveyor belt 13. The first head portion 11 is provided on the upstream side of the second head portion 12. The first fibers and the second fibers are supplied from the feeders (not shown) to the respective heads 11 and 12. The first fiber includes fiber-based fibers, fine-diameter fibers, and large-diameter fibers. The second fiber contains a large diameter fiber and a small diameter fiber, and does not contain a cellulose fiber. Further, air is supplied from the air supply source (not shown) to each of the heads 11 and 12. The air supplied to each of the head portions 11 and 12 is used to deposit the first fibers and the second fibers on the upper surface of the conveyor belt 13. Further, each of the head portions 11 and 12 includes a plurality of brush rollers 14 . The brush roller 14 includes a comb tooth provided on the circumferential surface of the roller body. The comb teeth rise toward the normal direction of the sh circumferential surface of the roller body. The brush roller 14 is for dispersing the first fibers and the second fibers respectively supplied to the respective head portions 11 and 12.

In the manufacturing apparatus 10, the first suction box 21 and the second suction box 22 are provided so as to face the respective head portions 11 and 12 at positions inside the surrounding conveyor belt 13. The first suction box 21 and the second suction box 22 are used for suction when the first fibers and the second fibers are transported to the air and dispersed from the respective head portions 11 and 12, and the fibers are reliably deposited on the conveyor belt. 13 on.

When the cleaning sheet 1 is produced by using the manufacturing apparatus 10, for example, first, the first fibers including the cellulose fibers, the fine fibers, and the large diameter fibers are supplied to the first head portion 11 and dispersed by the brush roller 14. The first fiber is conveyed to the air flow, and is scattered downward from the first head portion 11, that is, toward the upper surface of the conveyor belt 13. Thereby, a liquid retaining layer 4 comprising a fiber web of an airlaid layer is formed. Then, a scraping layer 5 including a fiber web including an air-laid layer of a large-diameter fiber and a fine-diameter fiber is formed on the formed liquid retaining layer 4, thereby laminating. When the scraping layer 5 is formed, the second fiber including the small diameter fiber and the large diameter fiber is supplied to the second head portion 12, and is dispersed by the brush roller 14, and then the second fiber is transferred to the air flow. The head 12 is spread downward, that is, toward the upper surface of the liquid retaining layer 4. Further, the liquid holding layer 4 and the scraping layer 5 are integrated by a specific method.

When the cleaning sheet 1 is manufactured using the manufacturing apparatus 10, the formation includes the airflow. The degree of attraction of the first suction box 21 at the time of the liquid retaining layer 4 of the web of the formed layer is adjusted, whereby the surface of the liquid holding layer 4 opposite to the surface opposite to the airlaid layer 5 can be controlled to be opposite The number of the front ends of the large diameter fibers of the surface. Specifically, by reinforcing the degree of attraction of the first suction box 21, it is possible to increase the number of the front ends of the large-diameter fibers on the surface of the liquid holding layer 4 opposite to the surface facing the air-laid layer 5 number. As another method, the ratio of the large-diameter fibers to the first fibers may be increased, and the large-diameter fibers of the surface of the liquid-retaining layer 4 on the opposite side to the surface opposite to the air-laid layer 5 may be added. The number of front ends.

The manufacturing apparatus 10 shown in FIG. 5 is provided with two heads in which the fibers are scattered. In place of this, the manufacturing apparatus 10 may have three or more heads. For example, the manufacturing apparatus 10 may include the first head, the second head, and the third head in this order from the upstream side in the circumferential direction D of the conveyor belt 13. In this case, it is preferable to provide the first to third suction boxes corresponding to the number of the heads. When a manufacturing apparatus having such a configuration is used, it is preferable to supply a first fiber including a cellulose fiber, a small diameter fiber, and a large diameter fiber to the first head portion, and to supply the cellulose fiber to the second head portion. And the second fiber of the fine fiber (excluding the large diameter fiber), and the third fiber including the small diameter fiber and the large diameter fiber (excluding the cellulose fiber) is supplied to the third head. The cleaning sheet 1 thus produced is composed of a liquid retaining layer 4 including a first fiber, a scraping layer 5 including a third fiber, and a fiber interposed between the two layers 4 and 5 and having a middle between the two layers 4 and 5. The constructor of the middle layer. In this case, by increasing the degree of attraction of the first suction box 21, the front end of the large diameter fiber of the surface of the liquid holding layer 4 opposite to the surface facing the airlaid layer 5 may be increased. The number of departments. Further, it is preferable to weaken the suction force of the second suction box to be smaller than the suction force of the first suction box and the third suction box.

Fig. 6 (a) and (b) show another embodiment of the cleaning sheet 1 of the present invention. The cleaning sheet 1 shown in the same figure differs from the cleaning sheet shown in Figs. 1 to 4 in the structure of the liquid holding layer 4. Specifically, in the cleaning sheet shown in FIG. 1 to FIG. 4, the polishing particles are not adhered to the front end region of the large-diameter fiber 2 present on the surface of the liquid holding layer 4, but the cleaning sheet 1 of the present embodiment Medium, large diameter fiber present on the surface of the liquid retaining layer 4 The front ends of the dimension 2 have spaces between each other, and the abrasive particles 6 are detachably present in the space. Further, the large-diameter fiber 2 having the tip end portion present on the surface of the liquid retaining layer 4 is in a state in which the abrasive particles 6 are not substantially adhered to the end region including the tip end portion. The abrasive particles 6 are in contact with the large-diameter fibers 2 and are not fixed by an adhesive or the like. It is preferable that the abrasive particles 6 are present in the space described above from the liquid retaining layer 4. In the state in which the abrasive particles 6 are detached, the abrasive particles 6 are present in the scraping layer 5 in such a manner that the cleaning sheet 1 is vibrated in a state where the cleaning sheet 1 is not wetted. When an external force is generated by bending or the like, at least a part of the abrasive particles 6 are detached from the liquid retaining layer 4 of the cleaning sheet 1.

The abrasive particles 6 are preferably uniformly present throughout the entire thickness direction of the liquid retaining layer 4. However, it is advantageous that the abrasive particles 6 are substantially absent from the surface area including the outermost surface of the liquid retaining layer 4. The definition of "surface area" is as described above. Moreover, the definition of "substantially nonexistent" is also as described above. Since the abrasive particles 6 are present in such a manner, when the dirt on the surface to be cleaned is removed by the liquid retaining layer 4, the abrasive particles 6 are quickly and largely released to the surface to be cleaned. As a result, the dirt can be easily and quickly removed. The front end region is a depth region which is within 5 times the diameter of the large diameter fiber 2 from the front end portion.

In the cleaning sheet 1 of the present embodiment, the description of the cleaning sheet shown in FIGS. 1 to 4 will be appropriately applied to the cleaning sheet 1 which is not particularly described above.

Hereinabove, the present invention has been described based on preferred embodiments thereof, but the present invention is not limited to the above embodiments. For example, although the cleaning sheet 1 described above is of a dry type, the cleaning sheet 1 may be immersed in water or an aqueous cleaning agent containing water and a surfactant instead of the dry type. Wet type.

Further, in the above embodiment, when the abrasive particles 6 are applied to the scraping layer 5, the member having a smooth surface is used, and the member is pressed against the coating film containing the slurry of the abrasive particles 6, and thereafter, the fiber sheet is used. Wiping the dried coating film or not using the fiber The sheet is wiped. The same applies to the liquid retaining layer 4.

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

In the above embodiment, the present invention further discloses the following cleaning sheet.

<1> A cleaning sheet comprising a liquid-retaining layer comprising a cellulose-based fiber 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 air-laid layer laminated on one side thereof And the airlaid layer comprises thermoplastic fibers, and the intersections of the constituent fibers are fused or followed. The airlaid layer comprises a large diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a fineness of 0.5. ~5dtex and fine fiber thermoplastic fibers having a fiber length of 2 to 15 mm, on the surface of the airlaid layer, a plurality of front ends of the above-mentioned large-diameter thermoplastic fibers are present, and have abrasiveness or scraping on the dirt existing on the surface of the cleaning object. And a plurality of the front ends of the plurality of the large-diameter thermoplastic fibers are present on the surface of the liquid-retaining layer opposite to the surface opposite to the air-laid layer, and the number of the ends is less than that present in the airflow The number of the front ends of the above-mentioned large diameter thermoplastic fibers on the surface of the mesh layer.

<2> The cleaning sheet according to the above <1>, wherein the number of the front end portions of the large-diameter thermoplastic fibers present on the surface of the liquid retaining layer is the above-mentioned large-diameter thermoplastic present on the surface of the air-laid layer The number of the front ends of the fibers is 0.1% or more and 20% or less.

<3> The cleaning sheet according to the above <1> or <2>, which comprises 10% by mass or more of the above-mentioned large-diameter thermoplastic fiber.

The cleaning sheet according to any one of the above items <1> to <3> wherein The ratio of the diameter of the thermoplastic fiber to the cleaning sheet is preferably 10% by mass or more and 90% by mass or less, more preferably 30% by mass or more and 90% by mass or less, and still more preferably 50% by mass or more and 90% by mass. Below mass%.

The cleaning sheet according to any one of the above-mentioned items, wherein the constituent fibers of the fiber web including the cellulose-based fiber and the heat-fusible fiber are fused or joined to each other. In this manner, the liquid retaining layer is formed, and in addition to the liquid retaining layer, the constituent fibers of the fiber web including the large-diameter thermoplastic fiber and the fine-diameter thermoplastic fiber are fused or joined to each other, thereby forming the air-laid layer. The airflow layer is formed on the single-layer layer of the liquid retaining layer, and the two layers are integrated.

The cleaning sheet according to any one of the above-mentioned items, wherein the laminated fiber comprises the above-mentioned large-diameter thermoplastic fiber on one side of the fiber web including the cellulose-based fiber and the heat-fusible fiber. And the fiber web of the fine-diameter thermoplastic fibers, and the intersection of the constituent fibers of the respective webs and the two fibers are fused or followed, thereby forming the liquid retaining layer and the air-laid layer, and maintaining the liquid The layer is integrated with the airlaid layer.

The cleaning sheet according to any one of the above-mentioned items, wherein the air-laid layer has a space between the large-diameter thermoplastic fibers, and the abrasive particles are detachably present in the space. The large-diameter thermoplastic fiber having a distal end portion on a surface of the surface of the airlaid layer opposite to the surface facing the liquid retaining layer, wherein the abrasive particles are substantially not adhered to the end region including the front end portion .

The cleaning sheet according to any one of the items <1> to <7>, which has a two-layer structure including the liquid holding layer and the airlaid layer.

The cleaning sheet according to any one of the above items <1> to <8> wherein The flow-forming layer has a concave-convex structure on its surface.

The cleaning sheet according to any one of the above-mentioned items, wherein the air-laid layer has a rhombic lattice-shaped recess on the surface.

The cleaning sheet according to any one of the above-mentioned items, wherein the air-laid layer has a rhombic lattice-shaped recess on the surface, and the region surrounded by the rhombic lattice-shaped recess includes a convex portion. And a non-fused portion having a lower density than the concave portion, the concave portion having a higher density than the non-embossed portion.

The cleaning sheet according to any one of the above-mentioned items, wherein the air-laid layer has a concavo-convex structure on the surface thereof, and the pattern shape of the concave portion is a line shape, a dot shape, or a specific pattern. Arbitrary shape.

The cleaning sheet according to any one of the above-mentioned items, wherein the air-laid layer has a concavo-convex structure on the surface thereof, and the total area of the concave portion is opposite to the cleaning surface of the cleaning sheet. The area is preferably 5% or more and 50% or less, and more preferably 10% or more and 40% or less.

<14> The cleaning sheet according to any one of <1> to <13> which has a perforation line.

The cleaning sheet according to any one of the above aspects, wherein the large-diameter thermoplastic fiber is a short fiber.

The cleaning sheet according to any one of the above aspects, wherein the large-diameter thermoplastic fiber has a crimping property.

The cleaning sheet according to any one of the above aspects, wherein the fine-diameter thermoplastic fiber is a short fiber.

The cleaning sheet according to any one of the above aspects, wherein the plurality of the large-diameter thermoplastic fibers are erected on the surface of the airlaid layer and have a front end portion.

The cleaning sheet according to any one of the above-mentioned <1> to <18> wherein, in the above-mentioned large-diameter thermoplastic fiber, the longitudinal direction of the large-diameter thermoplastic fiber is relative to the airflow. When the in-plane direction of the layered layer is set to 0 degree, the angle formed by the in-plane direction and the longitudinal direction of the large-diameter thermoplastic fiber is preferably inclined by 30 degrees or more, and more preferably by 45 degrees or more.

The cleaning sheet according to any one of the above-mentioned items, wherein the cellulose-based fiber is a hydrophilic fiber.

<21> A sheet package for cleaning according to any one of the above-mentioned <1> to <20>, wherein a laminate of a cleaning sheet according to any one of the above <1> to <20> is placed in a packaging material.

<22> The cleaning sheet package according to the above <21>, wherein the packaging material includes an opening for taking out the cleaning sheet from the packaging material, and a resealable lid for closing the opening Closed member.

<23> The cleaning sheet package according to the above <21>, wherein a plurality of the cleaning sheets 1 are stacked such that the side of the liquid holding layer of the cleaning sheet faces upward.

[Industrial availability]

As described in detail above, according to the cleaning sheet of the present invention, since the respective faces of the sheet have the scraping property and the scraping performance is different, an appropriate surface can be used depending on the degree of adhesion of the dirt. Further, since the surface on the opposite side to the surface on which the dirt is scraped is used to prevent the hand from slipping, the operability of the scraping is improved.

Claims (23)

A cleaning sheet comprising a liquid-retaining layer comprising a cellulose-based fiber 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, and the above The airlaid layer comprises thermoplastic fibers, and the intersections of the constituent fibers are fused or followed. The airlaid layer comprises a large diameter thermoplastic fiber having a fineness of 10 to 150 dtex and a fiber length of 2 to 15 mm, and a fineness of 0.5 to 5 dtex. a fine-diameter thermoplastic fiber having a fiber length of 2 to 15 mm, and a plurality of the ends of the plurality of the large-diameter thermoplastic fibers are present on the surface of the air-laid layer, and have abrasiveness or scraping property to the dirt existing on the surface of the cleaning object. The surface of the liquid retaining layer opposite to the surface opposite to the airlaid layer also has a plurality of front ends of the plurality of large-diameter thermoplastic fibers, the number of which is less than the surface present on the airlaid layer The number of the front ends of the above-mentioned large diameter thermoplastic fibers. The cleaning sheet according to claim 1, wherein the front end portion of the large-diameter thermoplastic fiber present on the surface of the liquid retaining layer is present at a front end of the large-diameter thermoplastic fiber present on the surface of the air-laid layer. The presence number is 0.1% or more and 20% or less. The cleaning sheet according to claim 1, which comprises 10% by mass or more of the above-mentioned large-diameter thermoplastic fiber. The cleaning sheet according to claim 1, wherein the ratio of the large-diameter thermoplastic fiber to the cleaning sheet is 10% by mass or more and 90% by mass or less. The cleaning sheet according to claim 1, wherein the constituent fibers of the fiber web including the cellulose-based fiber and the heat-fusible fiber are fused or joined to each other, Thereby, the liquid retaining layer is formed, and in addition to the liquid retaining layer, the intersection of the constituent fibers in the fiber web including the large-diameter thermoplastic fiber and the fine-diameter thermoplastic fiber is fused or followed, thereby forming the air-laid layer The airflow layer is formed on the single-layer layer of the liquid retaining layer, and the two layers are integrated. The cleaning sheet according to claim 1, wherein the fiber web including the large-diameter thermoplastic fiber and the fine-diameter thermoplastic fiber is laminated on one side of the fiber web including the cellulose fiber and the heat-fusible fiber, and The intersection of the constituent fibers of each of the webs and the two webs are fused or subsequently formed thereby forming the liquid retaining layer and the airlaid layer, and integrating the liquid retaining layer with the airlaid layer. The cleaning sheet according to claim 1, wherein the air-laid layer has a space between the large-diameter thermoplastic fibers, and the abrasive particles are detachably present in the space, and the front end portion is present on the air-laid layer. The above-mentioned large-diameter thermoplastic fiber having a surface opposite to the surface facing the liquid retaining layer has substantially no such abrasive particles adhered to the end region including the tip end portion. The cleaning sheet according to claim 1, which has a two-layer structure including the liquid retaining layer and the airlaid layer. The cleaning sheet according to claim 1, wherein the airlaid layer has a concavo-convex structure on a surface thereof. The cleaning sheet according to claim 1, wherein the airlaid layer has a diamond-shaped lattice-shaped recess on the surface. The cleaning sheet according to claim 1, wherein the airlaid layer has a rhombic lattice-shaped recess on the surface, and the region surrounded by the rhombic lattice-shaped recess includes a convex portion and becomes a density. Below the non-fused portion of the recess, the recess is denser than the non-embossed region. The cleaning sheet according to claim 1, wherein the airlaid layer has a concavo-convex structure on the surface thereof, and the pattern shape of the concave portion is a linear shape, a dot shape, or an arbitrary shape of a specific pattern. The cleaning sheet according to claim 1, wherein the airlaid layer has a concavo-convex structure on the surface thereof, and the total area of the recessed portion is 5% or more and 50% or less with respect to the area of the cleaning surface of the cleaning sheet. A cleaning sheet according to claim 1, which has a perforation line. The cleaning sheet according to claim 1, wherein the above-mentioned large-diameter thermoplastic fiber is a short fiber. The cleaning sheet according to claim 1, wherein the above-mentioned large-diameter thermoplastic fiber has a crimping property. The cleaning sheet according to claim 1, wherein the fine-diameter thermoplastic fiber is a short fiber. The cleaning sheet according to claim 1, wherein the plurality of large-diameter thermoplastic fibers stand on the surface of the airlaid layer and have a front end portion thereof. The cleaning sheet according to claim 1, wherein, in the above-mentioned large-diameter thermoplastic fiber, when the longitudinal direction of the large-diameter thermoplastic fiber is set to 0 degree with respect to the in-plane direction of the air-laid layer, the in-plane direction and the The angle formed by the longitudinal direction of the large-diameter thermoplastic fiber is inclined by 30 degrees or more. The cleaning sheet according to claim 1, wherein the cellulose fibers are hydrophilic fibers. A cleaning sheet package in which a laminated body in which a plurality of sheets for cleaning according to any one of claims 1 to 20 are laminated is housed in a packaging material. 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 sealing member that closes the opening. The cleaning sheet package according to claim 21, wherein the cleaning sheet is used A plurality of the cleaning sheets are stacked on the side of the liquid retaining layer.