Cleaning sheet

Abstract

To provide a cleaning sheet capable of reliably capturing dust without damaging the surface to be cleaned regardless of the size of the dust particles falling on the surface to be cleaned. The cleaning sheet 1 is for cleaning an object to be cleaned and comprises a base sheet 2, a first brush part 3 provided on the base sheet 2 and made of a fiber material, and a second brush part 4 provided on the base sheet 2 and made of a laminated pulp material.

Description

[Technical field]

[0001] The present invention relates to a cleaning sheet used for cleaning, and more particularly to a cleaning sheet suitable for cleaning floors, desks, etc. [Background technology]

[0002] Conventionally, cleaning tools have been known that capture foreign matter such as hair, lint, and dust that has fallen on a surface to be cleaned, such as a floor such as a wooden floor or tatami mat, or the surface of a table, to make the surface to be cleaned clean and free of dust. These cleaning tools generally have a head part to which a cleaning sheet for wiping the surface to be cleaned is attached at one end of a handle held by a user. The user attaches and fixes the cleaning sheet to the head part and wipes the surface to be cleaned while operating the handle, thereby removing the dust on the surface to be cleaned.

[0003] Cleaning sheets have also been improved in various ways in order to capture more and more dust particles on the surface to be cleaned. For example, in conventional cleaning sheets, the peripheral parts of the sheet frequently come into contact with foreign matter such as dust particles on the surface to be cleaned during cleaning, so that the peripheral parts of the cleaning sheet mainly capture foreign matter, and the central part tends to capture foreign matter less frequently. For this reason, Patent Document 1 shown below discloses a cleaning sheet in which a viscoelastic adhesive material is provided in the central part of the cleaning sheet, so that foreign matter on the surface to be cleaned that cannot be captured by the peripheral parts of the cleaning sheet can be captured in the central part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-137503 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the cleaning sheet disclosed in the above-mentioned Patent Document 1 is provided with a viscoelastic adhesive, so that it is difficult to slide when cleaning the surface to be cleaned, and it is difficult to clean smoothly. In addition, in the case of the cleaning sheet disclosed in Patent Document 1, although the adhesive can easily capture foreign objects, the captured foreign objects are strongly captured by the adhesive, so that if a hard foreign object or a foreign object with a sharp part is captured, when the cleaning sheet is moved to wipe the cleaning surface while the foreign object is still captured, the captured foreign object may damage the floor surface. In addition, when the cleaning sheet disclosed in Patent Document 1 wipes the surface to be cleaned during cleaning, the size and material of the dust that can be captured tend to be limited, making it difficult to capture all types of dust present on the surface to be cleaned.

[0006] The present invention has been made in consideration of the above-mentioned points, and aims to provide a cleaning sheet that can reliably capture dirt without damaging the surface to be cleaned, regardless of the size of the dust that has fallen on the surface to be cleaned. [Means for solving the problem]

[0007] The invention according to claim 1 is a cleaning sheet for cleaning an object to be cleaned, comprising: a base sheet; a first brush member which is a member different from the base sheet provided on one side of the base sheet and which is formed of a sheet-like fiber made of a fibrous material in a raised state; and a member different from the base sheet provided on one side of the base sheet and which is made of a crushed pulp material. The fibers of the pulp material are stacked to form spaces between the fibers for capturing the objects to be cleaned. The present invention relates to a cleaning sheet comprising a second brush member having a first surface formed thereon. Effect of the Invention

[0008] According to the invention described in claim 1, the first brush part with fibers scrapes off and captures hair, lint, etc., and the second brush part with layers of crushed pulp scrapes off and captures foreign objects smaller than lint, so a cleaning sheet that can handle all kinds of foreign objects of different sizes and materials can be provided. In addition, hard dust is captured by the second brush part, and the captured dust is held in a state of being hidden within the second brush part, so that such dust does not damage the surface to be cleaned during wiping, and the surface to be cleaned can be wiped with confidence. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing a cleaning sheet according to the present embodiment. [Diagram 2] 2 is a cross-sectional view (a cross-sectional view taken along line AA in FIG. 1) of the cleaning sheet of the present embodiment. [Diagram 3] FIG. 13 shows a cleaning sheet during the manufacturing process. [Figure 4] FIG. 11 shows another example of a cleaning sheet in the manufacturing process. [Diagram 5] FIG. 2 is a schematic diagram showing a manufacturing line for the cleaning sheet of the present embodiment. [Figure 6] FIG. 2 is an explanatory diagram for illustrating a schematic configuration of a state in which the cleaning sheet is attached to a cleaning tool. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The cleaning sheet of the present invention will be described in detail below with reference to the drawings. The cleaning sheet 1 of this embodiment can be used in either a dry or wet manner, and the chemical liquid used in the wet manner is not limited. The object to be cleaned is also not particularly limited. In this specification, the X direction and Y direction relative to the cleaning sheet refer to the directions shown in Figs. 1, 3 to 6. That is, when the cleaning sheet 1 is attached to a cleaning tool 101 (see Fig. 6), the X direction in the figure is the wiping direction in which the floor surface is wiped during cleaning. In addition, during the manufacture of the cleaning sheet 1, the conveying direction (machine direction) when the cleaning sheet 1 is conveyed is the Y direction.

[0011] First, a schematic configuration of a cleaning tool to which a cleaning sheet according to the present invention is attached will be described with reference to FIG. 6. This cleaning tool 101 includes a head portion 102, a handle 103, and a fixture 104 for attaching and fixing the handle 103 to the head portion 102. This cleaning tool 101 wraps a cleaning sheet 1 around the outer periphery of the head portion 102, and attaches and fixes both side edges 5 of the cleaning sheet 1 to sheet attachment portions (not shown) formed on the head portion 102. The structure of the sheet attachment portion for attaching the cleaning sheet 1 to the head portion 102 may be selected and applied in any conventional manner. For example, a groove may be formed in advance as the sheet attachment portion at a predetermined position on the head portion 102, and the cleaning sheet 1 may be attached by fitting the end of the cleaning sheet 1 into the groove, or another method may be used.

[0012] As shown in FIG. 6, the cleaning sheet 1 has a cleaning surface 1a. This cleaning surface 1a is a surface that faces a floor surface F when the cleaning sheet 1 is attached to the head unit 102. As shown in FIG. 6, the cleaning sheet 1 according to this embodiment includes a first brush part 3 and a second brush part 4, which will be described later, on a base sheet 2, and these first brush part 3 and second brush part 4 face the floor surface F. Therefore, the cleaning surface 1a in this embodiment refers to the surface of the base sheet 2 (the lower surface in FIG. 6) at the location where the base sheet 2 faces the floor surface F, and the surface of the first brush part 3 (the lower surface in FIG. 6) at the location where the first brush part 3 faces the floor surface F. In addition, at the location where the second brush part 4 is arranged, the surface 4a of the second brush part 4 facing the floor surface F and the side surface 4b of the second brush part 4 constitute the cleaning surface 1a. 6, an embodiment in which only the first brush part 3 and the second brush part 4 are in contact with the floor surface F has been described, but this is not limited thereto, and the floor surface F may be cleaned using the base sheet 2, the first brush part 3, and the second brush part 4. Other embodiments may also be used.

[0013] Next, the configuration of the cleaning sheet 1 will be described with reference to Figures 1 and 2. This cleaning sheet 1 comprises a base sheet 2, and a first brush part 3 and a second brush part 4 formed on the cleaning surface 1a, and these first brush part 3 and second brush part 4 are provided at different positions and are made of different materials. Details of each part constituting the cleaning sheet 1 will be described below. Note that, although some of the multiple cut parts 8 described later can usually be seen in Figures 1 and 2, the cut parts 8 are omitted from Figures 1 and 2 to simplify the drawings.

[0014] (Base sheet 2) The base sheet 2 is a member that becomes the base of the cleaning sheet 1. The surface of the base sheet 2 (the surface facing the floor surface F shown in FIG. 6) is the cleaning surface 1a, and the cleaning surface 1a is composed of a first bonding area 21 where the first brush part 3 is provided by bonding or the like, and a second bonding area 22 where the second brush part 4 is provided by bonding or the like. The first bonding area 21 and the second bonding area 22 are sometimes collectively referred to as the cleaning area 23. The cleaning area 23 is an area that captures and holds objects to be cleaned, such as dust, present on the floor surface F during cleaning. In addition, both side edges 5 are formed on the outer side of the cleaning area 23 in the X direction. When the both side edges 5 are attached to the head part 102 of the above-mentioned cleaning tool 101, they are located above the bottom part 102a of the head part 102 and are attached and fixed to the head part 102. That is, the cleaning sheet 1 has a base sheet 2 having a cleaning region 23 and a region in which both side edges 5 are formed, and both side edges 5 are formed on both ends of the cleaning region 23 in the X direction.

[0015] The base sheet 2 may be made of paper, synthetic fiber, nonwoven fabric, or other sheet, but in this embodiment, nonwoven fabric is used. As the nonwoven fabric, various types of nonwoven fabric such as spunlace nonwoven fabric, spunbond nonwoven fabric, thermal bond nonwoven fabric, and air-through nonwoven fabric may be used. The fibers constituting the nonwoven fabric may be any of natural fibers, synthetic fibers, and composite fibers. The dimensions of the base sheet 2 are, for example, about 200 mm to 300 mm in the X direction and about 250 mm to 350 mm in the Y direction, but are not limited thereto. The basis weight of the nonwoven fabric is 8 g / m 2 From 60 g / m 2 It is preferable that the thickness is about that. The base sheet 2 is not limited to being made of one sheet, but may be made by overlapping two or more sheets. When forming the base sheet 2 by overlapping a plurality of sheets, the sheets may be of the same type or different types. The materials, colors, thicknesses, etc. of the sheets to be overlapped may be the same or different. Furthermore, the other points than those mentioned above may be the same or different.

[0016] (First brush part 3) FIG. 3 is a diagram showing the cleaning sheet 1 in the manufacturing process, showing the state before the second brush part 4 is joined. In FIG. 3, the area surrounded by a dotted line in the center of the X direction shows the area where the second brush part 4 is joined, and the area surrounded by the dotted line is the second joining area 22. As shown in FIG. 3, the first brush part 3 is formed at a plurality of locations sandwiching the second brush part 4. In addition, the first brush part 3 has a sheet-like fiber 6, a joint 7, and a cut part 8. In the first brush part 3, the base sheet 2 and the sheet-like fiber 6 arranged on the front side of the base sheet 2 are joined at the joint 7, and further, after joining, the first brush part 3 is cut at a predetermined position between the joints 7 adjacent to each other. In other words, the first brush part 3 is formed by joining the base sheet 2 and the sheet-like fiber 6 at the joint 7 and cutting the joined sheet-like fiber 6 at a predetermined position. 3, the first brush parts 3 are formed at a plurality of locations in a plurality of second bonding regions 22 in the base sheet 2. In other words, in the second bonding region 22, a plurality of first brush parts 3 are formed to form one group.

[0017] In the following, a plurality of first brush parts 3 formed in a row so that the positions in the Y direction are sequentially different from each other while the positions in the X direction shown in FIG. 3 are the same, and are collectively referred to as the first brush part group. In this embodiment, a first first brush part group 3a, a second first brush part group 3b, a third first brush part group 3c, and a fourth first brush part group 3d are formed. These are sequentially arranged at a predetermined interval in the direction along the X direction on the base sheet 2, and the second brush part 4 is arranged between the second first brush part group 3b and the third first brush part group 3c. Each of the first first brush part group 3a, the second first brush part group 3b, the third first brush part group 3c, and the fourth first brush part group 3d is formed so that the first brush parts 3 are arranged in a row in the direction along the Y direction. The second brush part 4 is not limited to being disposed between the second first brush part group 3b and the third first brush part group 3c, and may be disposed at other locations, for example, between the first first brush part group 3a and the second first brush part group 3b, or between the third first brush part group 3c and the fourth first brush part group 3d. The second brush part 4 is not limited to being disposed at one location, and may be disposed at multiple locations. For example, the second brush part 4 may be disposed at all three locations between the first first brush part group 3a and the second first brush part group 3b, between the second first brush part group 3b and the third first brush part group 3c, and between the third first brush part group 3c and the fourth first brush part group 3d, or may be disposed at two of these three locations. Furthermore, the second brush portion 4 may be disposed not only between the first to fourth first brush portion groups 3a, 3b, 3c, and 3d described above, but also, for example, between the first brush portion 3 and the first brush portion 3 constituting the first first brush portion group 3a. In this case, the second brush portion 4 may be provided in a plurality of locations.

[0018] As shown in FIG. 3, the formation positions of the first brush parts 3 constituting the first first brush part group 3a in the Y direction and the formation positions of the first brush parts 3 constituting the second first brush part group 3b in the Y direction are mutually shifted in the Y direction. Similarly, the formation positions of the first brush parts 3 constituting the third first brush part group 3c in the Y direction and the formation positions of the first brush parts 3 constituting the fourth first brush part group 3d in the Y direction are mutually shifted in the Y direction. In the cleaning sheet 1 according to this embodiment, the first brush parts 3 constituting the second first brush part group 3b are disposed between the first brush parts 3 and the first brush parts 3 constituting the first first brush part group 3a. Similarly, the first brush parts 3 constituting the fourth first brush part group 3d are disposed between the first brush parts 3 and the first brush parts 3 constituting the third first brush part group 3c. In other words, the formation positions in the Y direction of the first brush portions 3 that constitute the first first brush portion group 3a, the formation positions in the Y direction of the first brush portions 3 that constitute the second first brush portion group 3b, the formation positions in the Y direction of the first brush portions 3 that constitute the third first brush portion group 3c, and the formation positions in the Y direction of the first brush portions 3 that constitute the fourth first brush portion group 3d are staggered.

[0019] By forming each of the first brush parts 3 in a staggered manner in this manner, when the cleaning sheet 1 advances in the X direction during wiping, the object to be cleaned on the floor surface F can be easily captured by the first brush parts 3. The arrangement of the first brush parts 3 is not limited to a staggered arrangement, and any arrangement known in the art may be applied. In addition, in this embodiment, an example has been described in which the first brush parts 3 of each of the first brush part groups 3a, 3b, 3c, and 3d are arranged in a staggered manner only in the Y direction, but the first brush parts 3 of each of the first brush part groups 3a, 3b, 3c, and 3d may be arranged in a staggered manner in both the X direction and the Y direction.

[0020] The plurality of joints 7 constituting the first first brush group 3a, the second first brush group 3b, the third first brush group 3c, and the fourth first brush group 3d are referred to as joint groups. That is, in this embodiment, as shown in Fig. 3, the first joint group 7a, the second joint group 7b, the third joint group 7c, and the fourth joint group 7d are formed as four joint groups. The number of the first joint group 7a, the second joint group 7b, the third joint group 7c, and the fourth joint group 7d may be set arbitrarily, and the number of the plurality of joints constituting one joint group may also be set arbitrarily.

[0021] The arrangement of the first brush part 3 may be selected from any conventionally known arrangement. The predetermined position for cutting the sheet-like fiber 6 may be selected from any of the above-mentioned positions, for example, the midpoint between the adjacent joints 7 and 7 may be the cutting position, or the cutting position may be closer to one of the joints 7 than the midpoint between the adjacent joints 7. When cutting at the above-mentioned midpoint, the length of the fibers extending from the adjacent joints 7 becomes the same, so that the object to be cleaned can be stably captured while adjusting the length of the fibers according to the object to be captured. When cutting at a position closer to one of the joints 7 than the above-mentioned midpoint, the length of the fibers extending from the adjacent joints 7 can be changed. By changing the length of the fibers in this way, a wide variety of objects to be cleaned can be captured. For example, there are objects to be cleaned that are easily captured by short fibers and objects to be cleaned that are easily captured by long fibers, and by changing the length of the fibers in this way, the width of the object to be easily captured can be freely adjusted.

[0022] In addition, between these joints 7 and 7, a first guide path S1 and a second guide path S2 are formed to guide the object to be cleaned on the floor surface F to either the first brush part 3 or the second brush part 4 when the cleaning sheet 1 is moving, for example, in the X direction during wiping. The first guide path S1 is formed between the first brush part 3 and the second brush part 4, and is intended to make it easier for the first brush part 3 or the second brush part 4 to capture the object to be cleaned. The second guide path S2 is formed between the joints 7 and 7 adjacent to each other, and is intended to make it easier for the joint part 7 of the first brush part 3 or the side surface 4b of the second brush part 4 to capture the object to be cleaned. By forming these first guide path S1 and second guide path S2, it is possible to make it easier for the second brush part 4 to capture the object to be cleaned that cannot be captured by the first brush part 3.

[0023] (Sheet Fiber 6) In this embodiment, the sheet-like fibers 6 are natural fibers such as cotton and wool, synthetic fibers such as polyethylene, polypropylene, polyethylene terephthalate, nylon, and polyacrylic, and composite fibers such as core-sheath type fibers, sea-island type fibers, and side-by-side type fibers. The fibers constituting the sheet-like fibers 6 used in the first brush part 3 are preferably thermoplastic fibers having thermal adhesion with the base sheet 2, and among them, core-sheath type composite fibers having a polypropylene core and a polyethylene sheath are more preferable because they have both excellent thermal adhesion of the polyethylene constituting the sheath and the stiffness of the polypropylene constituting the core. The fibers used are those with a diameter of about 0.01 mm to 0.3 mm, and may be composed of only fibers having the same material, thickness, color, etc., or may be composed of two or more different fibers. Although two sheets of sheet-like fibers 6 are shown in FIG. 3, three or more sheets may be used, and when the second brush part 4 is provided on the end side of the base sheet 2, the sheet-like fibers 6 may be one sheet. In this manner, the sheet-like fiber 6 is formed in the area excluding the second brush portion 4 and both side edge portions 5. As described above, when the dimension of the base sheet 2 in the X direction is about 200 mm to 300 mm and the dimension in the Y direction is about 250 mm to 350 mm, about 3 g to 8 g of the sheet-like fiber 6 is used.

[0024] (joint part 7) The joints 7 are formed by partially joining the sheet-like fibers 6 to the base sheet 2 at a plurality of locations. The joints 7 can be formed by using various methods such as ultrasonic bonding, adhesion, heat fusion, and sewing alone or in combination. In this embodiment, an example in which the sheet-like fibers 6 are joined to the base sheet 2 by ultrasonic bonding will be described. In this embodiment, the joints 7 are formed as the above-mentioned joint group, with two rows in the X direction, each of which sandwiches the second brush part 4, along the Y direction, with a plurality of joints 7 (first joint group 7a, second joint group 7b, third joint group 7c, and fourth joint group 7d). In addition, the joints 7 included in the rows adjacent to each other in the X direction of the first joint group 7a and the second joint group 7b, and the third joint group 7c and the fourth joint group 7d are arranged to be shifted in the Y direction. The number of rows of the joints 7, the number of rows, and the intervals between the respective joints 7 may be set arbitrarily. The joint 7 may be formed in either the base sheet 2 or the sheet-like fiber 6. In this specification, an example is described in which the joint 7 is provided in either the base sheet 2 or the sheet-like fiber 6 as necessary, but the location of the joint is not limited to the above description.

[0025] (Notch 8) The incisions 8 are formed in the X direction of the sheet-like fiber 6. The incisions are formed as a pretreatment for raising the sheet-like fiber 6 with compressed gas, as described later. In FIG. 3, the incisions 8 are provided from one end of the sheet-like fiber 6 to the joint 7, but the present invention is not limited to this. For example, as shown in FIG. 4, the incisions 8 may be provided from one end of the sheet-like fiber 6 to the other end, avoiding the joint 7. In addition, the position where the joint 7 is formed may be shifted in the X direction, and the incisions 8 may be provided on both sides of the joint 7. The number and depth of the incisions 8 may be appropriately set, and for example, the depth of the incisions 8 may reach the base sheet 2.

[0026] When the first brush unit 3 is made of fibers having heat-sealing properties with the base sheet 2, the first brush unit 3 overlaps the sheet-like fibers 6 made of long fibers on the base sheet 2. In this way, the sheet-like fibers 6 overlapped on the base sheet 2 are arranged so that the fiber direction is along the Y direction in FIG. 3, and the sheet-like fibers 6 and the base sheet 2 are joined by intermittent heat sealing. At this time, as shown in FIG. 3, the first bonding group 7a and the second bonding group 7b are formed so that their positions in the Y direction are different. That is, when viewed only from the position in the Y direction, each bonding portion 7 constituting the second bonding group 7b is arranged between each bonding portion 7 of the rows constituting the first bonding group 7a.

[0027] Although not shown in Fig. 3 etc., when joining the sheet-like fibers 6, the fibers may be joined together by heat sealing or the like in a direction different from the fiber direction of the sheet-like fibers 6. Any conventionally known method may be selected as the method for joining the fibers together. Also, the position at which the fibers of such sheet-like fibers 6 are joined together may be appropriately selected from conventionally known methods.

[0028] In addition, in the base sheet 2, a cut portion 8 is formed in the X direction from each joint 7. The cut portion 8 is formed toward the direction of the joints 7 constituting the adjacent joint groups. For example, as shown in FIG. 3, the cut portion 8 is formed in the X direction (right side in FIG. 3) from the joints 7 included in the first joint group 7a toward the side where the joints 7 included in the second joint group 7b are formed. At this time, the cut portion 8 extending from the joints 7 included in the first joint group 7a is formed so that the cut is inserted between the joints 7 included in the second joint group 7b. Conversely, the cut portion 8 is formed in the X direction (left side in FIG. 3) from the joints 7 included in the second joint group 7b toward the side where the joints 7 included in the first joint group 7a are formed. The cut portion 8 is also formed so that the cut is inserted between the joints 7 included in the first joint group 7a, similar to the cut portion 8 described above. The same applies to the cut portions 8 formed from the joints 7 included in the third joint group 7c and the fourth joint group 7d.

[0029] The first brush portion 3 can be formed by cutting the fibers of the sheet-like fibers 6 by making an incision of a width equal to or greater than the width of the joint 7 at the above-mentioned location after joining the sheet-like fibers 6 and the base sheet 2.

[0030] In addition, when the fibers constituting the first brush part 3 do not have heat-sealing properties with the base sheet 2, the joints 7 may be formed using an adhesive instead of being provided by heat sealing, but even when the fibers constituting the first brush part 3 have heat-sealing properties with the base sheet 2, the joints 7 may be formed using an adhesive. In this case, for example, the fibers in the sheet-like fibers 6 may be intermittently bonded by heat sealing, and the sheet-like fibers 6 and the base sheet 2 may be bonded by adhesion. In addition, when the fibers have heat-sealing properties with the base sheet 2, the fibers in the sheet-like fibers 6 may be intermittently bonded by adhesion, and the sheet-like fibers 6 and the base sheet 2 may be bonded by heat sealing, but it is preferable that the fibers in the sheet-like fibers 6 are bonded by heat sealing, and the sheet-like fibers 6 and the base sheet 2 are bonded by adhesion.

[0031] The bonding portion 7 may be formed by a combination of heat sealing and adhesion, and may be formed by the same method by separately bonding the fibers in the sheet-like fibers 6 and bonding the sheet-like fibers 6 to the base sheet 2. However, in this case, the positions at which the sheet-like fibers 6 are intermittently bonded must coincide with the positions at which the sheet-like fibers 6 are intermittently bonded to the base sheet 2. The intervals between the bonding portions 7 included in the first bonding portion group 7a, the second bonding portion group 7b, the third bonding portion group 7c, and the fourth bonding portion group 7d may be the same or different. In addition, the intervals between the bonding portions 7 included in the first bonding portion group 7a and the second bonding portion group 7b, which are adjacent to each other, may be the same or different.

[0032] (2nd brush part 4) Returning to FIG. 1 and FIG. 2, in this embodiment, the second brush unit 4 is provided in the center of the base sheet 2 so as to be sandwiched between two first brush units 3. The second brush unit 4 uses an airlaid sheet made of an airlaid nonwoven fabric formed by crushing and laminating pulp. The airlaid sheet is formed into a sheet shape by adding a binder to crushed pulp, and water-soluble binders such as CMC (carboxymethyl cellulose) and EVA (ethylene-vinyl acetate copolymer) can be used. In addition, instead of a water-soluble binder, a solid binder such as a plastic material (e.g., acrylic) or a composite fiber (e.g., ES fiber) having thermal adhesiveness (thermal fusion) can be used, or a solid binder and a water-soluble binder can be used in combination.

[0033] The weight of the airlaid sheet is 50g / m 2 From 200 g / m 2 About 75g / m 2 From 150 g / m 2 This is because if the basis weight is less than the above-mentioned lower limit, the rigidity of the airlaid sheet is low and the water absorption is low, resulting in insufficient scraping performance and water absorption performance of the cleaning sheet 1. On the other hand, if the basis weight is more than the above-mentioned upper limit, the manufacturing cost of the cleaning sheet 1 increases and the dimensions (thickness) become too large.

[0034] The amount of water-soluble binder added is preferably 2.0% to 15% by weight of the airlaid sheet, and the amount of solid binder added is preferably 3% to 15% by weight of the basis weight of the airlaid sheet. In order to increase the rigidity of the airlaid sheet, the amount of binder added to the airlaid sheet can be increased.

[0035] As described above, when an airlaid sheet is used for the second brush unit 4, it is preferable that the airlaid sheet contains a naturally derived fiber material and is non-hydrolyzable. This airlaid sheet is formed by an airlaid method. Here, the "airlaid method" refers to a manufacturing method in which a stack of pulverized pulp or a large number of fibers made mainly from pulverized pulp is stacked along a downward air flow, and then various processes such as embossing are performed on the stack.

[0036] When an airlaid sheet is used for the second brush unit 4, it is preferable to use a naturally derived fiber material as the material. Specifically, the base paper sheet is preferably formed from pulp paper or a material whose main ingredient is pulp, that is, a material containing a cellulose-based component. Furthermore, it is preferable that the pulp content is 30% or more, and more preferably that the pulp content is 50% or more. Furthermore, it is even more preferable that the pulp content is 80% or more. By using this type of pulp content, it is possible to improve the overall flexibility of the airlaid sheet and further improve manufacturing costs and production efficiency.

[0037] The ground pulp is made by finely grinding raw pulp, which is the raw material of paper materials, into a cotton-like form using a grinder or the like. Various raw pulp materials may be used as the material for ground pulp. Here, ground pulp is made by grinding pulp material into a cotton-like form. Therefore, when cotton-like ground pulp is stacked in sequence, spaces are easily formed between the fibers. A large number of these spaces are formed between the fibers. The base paper sheet can be made bulkier by the amount of these spaces formed, and the permeability of the binder and crosslinking agent described below can also be improved. In addition, by forming a base paper sheet from the cotton-like ground pulp using an airlaid method, spaces can be formed between the stacked fibers, increasing the degree of freedom for each fiber to move. This can improve the flexibility of the base paper sheet and the production efficiency.

[0038] When pulp is used as the material of the airlaid sheet used in the second brush part 4, various raw pulps can be used as the pulp used. Examples of raw pulp include wood pulp, synthetic pulp, waste paper pulp, and toilet paper material. In addition, as the wood pulp, for example, pulp obtained by blending softwood bleached kraft pulp obtained from softwoods such as red pine, Yezo pine, Todo pine, Douglas fir, hemlock, and spruce, and hardwood bleached kraft pulp obtained from hardwoods such as beech, oak, birch, eucalyptus, oak, and alder in a predetermined ratio can also be used. However, from the viewpoint of manufacturing, it is preferable to use raw pulp made of softwood bleached kraft pulp. In addition, when natural fibers are used as the material used for the base paper sheet, it is preferable to use, for example, kenaf, bamboo fiber, straw, cotton, silk thread, sugar cane, and the like. Note that the above are merely examples, and are not limited to these examples. In addition, in the fiber sheet according to this embodiment, it is preferable to use pulverized pulp or a material whose main raw material is pulverized pulp.

[0039] (binder) The binder is for binding the naturally derived fiber material constituting the base paper sheet. The binder may be any material that is naturally degradable, has a predetermined adhesive force, and can bond the above-mentioned materials with a predetermined strength. Examples of such binders include polysaccharide derivatives, natural polysaccharides, synthetic polymers, proteins, alginic acid, chitosan, etc. Examples of polysaccharide derivatives include carboxymethyl cellulose (CMC), carboxyethyl cellulose, carboxymethylated starch or its salt, starch, methyl cellulose, ethyl cellulose, etc. Examples of natural polysaccharides include guar gum, trant gum, xanthan gum, sodium alginate, carrageenan, gum arabic, gelatin, casein, etc. Examples of synthetic polymers include polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer resin (EVA), polyvinyl alcohol derivatives, polymers or copolymers of unsaturated carboxylic acids, and salts thereof, and examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic anhydride, maleic acid, fumaric acid, etc. Among these, carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA) are particularly preferable. These binders may be used alone or in combination of two or more kinds. As binders used for the fiber sheet according to this embodiment, preferred are naturally degradable ones such as polycaprolactone, polyhydroxyalkanoate, polyhydroxybutyrate, polylactic acid, starch-based resins such as esterified starch, cellulose acetate, polyethylene succinate, polyvinyl alcohol, polyglycolic acid, chitosan / cellulose / starch, poly(hydroxybutyrate / hydroxyhexanoate), poly(caprolactone / butylene succinate), polybutylene succinate, poly(butylene succinate / adipate), poly(butylene succinate / carbonate), poly(ethylene terephthalate / succinate), poly(butylene adipate / terephthalate), poly(tetramethylene adipate / terephthalate), and other biodegradable resins or biodegradable resin mixtures; and biodegradable biomass resins.

[0040] CMC includes ammonium salt, sodium salt, potassium salt, etc. Among these CMCs, ammonium CMC has the property of crosslinking when heat is applied, that is, self-crosslinking. Therefore, when ammonium CMC is used as a binder, the amount of crosslinking agent impregnated may be reduced or no crosslinking agent may be impregnated, compared to when other types of CMC are used as binders. Also, there are PVAs that require crosslinking agents and those that do not, so when using PVA that does not require crosslinking agents as a binder, no crosslinking agent may be impregnated.

[0041] (Crosslinking agent) The crosslinking agent is a chemical that crosslinks with the binder to form a crosslinked structure. The crosslinking agent according to the present embodiment is preferably one that has natural decomposition properties. For example, when a binder having a carboxy group such as carboxymethylcellulose (CMC) is used, it is desirable to use a polyvalent metal ion having a valence of 2 or more. Examples of the polyvalent metal ion include metal ions such as magnesium, calcium, titanium, manganese, iron, cobalt, nickel, copper, zinc, aluminum, silver, and tin. In addition, examples of compounds that supply polyvalent metal ions include aluminum hydroxide, aluminum chloride, aluminum sulfate, dihydroxyaluminum aminoacetate, kaolin, aluminum stearate, aluminum magnesium hydroxide, aluminum potassium hydroxide, aluminum potassium sulfate (also known as alum), magnesium aluminometasilicate, aluminum glycinate, magnesium aluminometasilicate, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum hydroxide, ferrous sulfate, ferrous chloride, zinc sulfate, cupric chloride, tin chloride, and silver nitrate, which may be used alone or in any combination of two or more. In the fiber sheet according to the present embodiment, it is particularly preferable to use alum and copper sulfate. Examples of alum include sodium aluminum alum, potassium alum, ammonium alum, sodium chrome alum, potassium chrome alum, ammonium chrome, sodium iron alum, potassium iron alum, and ammonium iron alum. Since the alum in the present embodiment is preferably colorless, it is preferable to use sodium aluminum alum, potassium alum, and ammonium alum. For example, when ammonium alum is used as the alum, the concentration of the ammonium alum solution is preferably about 1% to 20%, and the temperature of the ammonium alum solution is preferably kept at 10°C to 60°C to prevent crystallization.

[0042] The airlaid sheet used in the second brush unit 4 is heat-treated while impregnated with the binder and cross-linking agent. By carrying out the heat treatment in this manner, it is possible to promote the cross-linking reaction of the binder that binds the materials constituting the airlaid sheet and the cross-linking agent that cross-links the binders themselves, thereby further increasing the bonding between the fibers and greatly improving the bonding strength. In addition, it is preferable that this heating be configured as a ventilation heating in which hot air is circulated in a chamber having a predetermined size. In addition, it is preferable that the airlaid sheet that has been subjected to the heat treatment is impregnated with a softener.

[0043] In addition, the airlaid sheet used for the second brush unit 4 is preferably washed in a state where it has been subjected to a heat treatment or where it has been impregnated with a fabric softener, in that it can be softer. When washing the airlaid sheet used for the second brush unit 4, it is preferable to wash it using a liquid such as water. In this way, an airlaid sheet that is both soft and strong can be obtained. And, the second brush unit 4 using the airlaid sheet thus formed has softness, so that it can capture objects to be cleaned that could not be captured by the first brush unit 3 due to their large size or hardness by wrapping the airlaid sheet. Therefore, it is possible to reliably capture objects to be cleaned that could not be captured by the first brush unit 3, and it is possible to more efficiently clean the surfaces to be cleaned, such as floor surfaces. Since the second brush unit 4 has a surface 4a and a side surface 4b, it is possible to wipe and clean the floor surface F with the surface 4a, and further to capture the objects to be cleaned with the side surface 4b. Therefore, it is possible to efficiently clean.

[0044] In addition, the second brush part 4 forms a space Z between the crushed pulp to capture the foreign matter to be cleaned. As a result, the captured object to be cleaned can be taken inside the space Z, so even if an object to be cleaned that is likely to damage the floor surface F is captured, cleaning can be continued without damaging the floor surface F, making it possible to clean with peace of mind.

[0045] A pattern 9 is formed on the second brush unit 4. This pattern 9 is regulated by a pair of embossing rolls 18 described later, and in this embodiment, is formed along the Y direction intersecting with the wiping direction (X direction), but is not limited to this, and may be formed along the X direction, or may be formed in the X direction and the Y direction, or may be formed at an angle of, for example, 45° from the X direction. The shape of the pattern 9 is also not limited to a straight line, and may be a wavy curve.

[0046] In this embodiment, in order to improve the ability to capture foreign matter, the pattern 9 is a linear pattern with a width in the X direction of about 1 mm to 6 mm, a length in the Y direction of about 5 mm to 50 mm, and a depth of about 0.3 mm to 3 mm, but is not limited to this, as described above. In this way, by forming the pattern 9 on the surface 4a of the second brush part 4, not only can the objects to be cleaned be easily captured, but the objects to be cleaned can also be easily captured in the space Z within the second brush part 4. Therefore, the objects to be cleaned, such as dust, can be more easily captured, and the cleaning ability can be further improved.

[0047] As is clear from the above description, the second brush part 4 has a higher rigidity than the first brush part 3, and therefore has excellent foreign matter scraping performance. In addition, the second brush part 4 is an airlaid sheet made of laminated pulverized pulp, and therefore the spaces formed between the pulverized pulp enable it to capture foreign matter smaller than lint, such as bread crumbs and confectionery crumbs. Furthermore, even pattern 9 is capable of capturing small foreign matter.

[0048] (Both sides 5) The side edges 5 are attached to the cleaning tool 101, and are provided at both ends in the Y direction intersecting with the X direction, which is the wiping direction. If the dimension of the base sheet 2 in the X direction is 220 mm, the width of each of the side edges 5 in the X direction is approximately 45 mm. Therefore, the combined width in the X direction of the two first brush units 3 and the second brush unit 4 is approximately 130 mm. Furthermore, the dimension in the X direction of one first brush unit 3 is approximately 40 mm to 50 mm, and the dimension in the X direction of the second brush unit 4 is approximately 30 mm to 50 mm.

[0049] Comparing the first brush portion 3 and the second brush portion 4 in terms of the area of ​​the base sheet 2, the two first brush portions 3 occupy 35% to 45% of the area of ​​the base sheet 2, the second brush portion 4 occupies 13% to 23% of the area of ​​the base sheet 2, and the two side edge portions 5 occupy 35% to 45% of the area of ​​the base sheet 2. By setting the area ratios of the first brush portion 3, the second brush portion 4, and the side edge portions 5 as described above, a well-balanced cleaning sheet 1 can be realized. The areas of one first brush portion 3 and the second brush portion 4 may be the same, and the areas of the two first brush portions 3 and the two side edge portions 5 may be the same.

[0050] According to the cleaning sheet 1 of this embodiment, the first brush part 3 collects hair, lint, and oil, and the second brush part 4 scrapes off foreign matter adhering to the floor surface, collects small food particles such as bread crumbs and confectionery crumbs, and absorbs liquid, thereby realizing a cleaning sheet 1 that collects and absorbs a large amount of foreign matter. Also, when the cleaning sheet 1 is a wet type, the airlaid sheet of the second brush part 4 absorbs a large amount of chemical liquid, so the floor area that can be cleaned can be expanded.

[0051] Fig. 5 is a schematic diagram showing a production line 100 for the cleaning sheet 1, and the method for producing the cleaning sheet 1 of this embodiment formed as described above will be described below. Note that the layout of the production line 100 in Fig. 5 is merely an example, and the arrangement of various devices can be changed as appropriate depending on the space available in the factory.

[0052] (Joining of base sheet 2 and sheet-like fiber 6) The base sheet 2 wound around the first roll 10 is transported in the Y direction, which is the machine direction (transport direction). The sheet-like fiber 6 wound around the second roll 11 is transported toward the base sheet 2. Although only one second roll 11 is shown in FIG. 5, there is another second roll 11 in the direction perpendicular to the page, and a total of two sheet-like fibers 6 are transported.

[0053] The base sheet 2 and the sheet-like fiber 6 are pressed by a pressing roll 12 and then bonded by an ultrasonic bonding device 13. The ultrasonic bonding device 13 has a horn 14 and an anvil 15. The horn 14 vibrates in resonance with the ultrasonic vibrations, and applies vibrational energy to the base sheet 2 and the sheet-like fiber 6 to generate frictional heat. The anvil 15 positions the base sheet 2 and the sheet-like fiber 6 and receives this vibrational energy.

[0054] (Formation of cut portion 8) A cutter 16 forms multiple cuts 8 in the base sheet 2 and the sheet-like fibers 6 bonded by the ultrasonic bonding device 13. The cutter 16 is provided with multiple replaceable blades according to the positions and lengths of the cuts 8 in Figures 3 and 4. The manufacturing process in which the cuts 8 have been formed is shown in Figure 3 or Figure 4.

[0055] (Formation of pattern 9 on second brush unit 4) The second brush unit 4 wound around the third roll 17 is transported by the transport roll 19 toward the joined base sheet 2 and sheet-like fiber 6. During this transport, a pattern 9 is formed on the second brush unit 4 by the pair of embossing rolls 18. As described above, the shape and size of the pattern 9 may be set appropriately. At least one of the pair of embossing rolls 18 is preferably heated to a temperature between 40° C. and 120° C., and the material thereof may be either a metallic material or a non-metallic material.

[0056] (Joining of base sheet 2 and second brush part 4) The second brush portion 4 on which the pattern 9 is formed, and the joined base sheet 2 and sheet-like fibers 6 are pressed by a pressing roll 20, and then the second brush portion 4 is joined to the base sheet 2 using an ultrasonic joining device 26. The ultrasonic joining device 26 has a horn 27 and anvil 28, and as its configuration and function are the same as those of the ultrasonic joining device 13, a description thereof will be omitted. Two first brush portions 3 and one second brush portion 4 are joined to the base sheet 2. The airlaid sheet of the second brush portion 4 has a basis weight of 70 g / m 2 By doing so, the height in the Z direction becomes higher than that of the first brush part 3 before it is raised. In this way, the second brush part 4 is more likely to come into contact with the floor surface, such as hardwood floor or tatami mats, when cleaning with the cleaning sheet 1, so that the second brush part 4 provided in the center of the cleaning sheet 1 can more easily capture small foreign objects and scrape off foreign objects adhering to the floor surface.

[0057] (Raising treatment of first brush part 3) The sheet-like fibers 6 of the first brush part 3 are raised by the raising device 24. The raising device 24 supplies compressed gas (e.g., air) toward the sheet-like fibers 6. This raises the fibers of the sheet-like fibers 6. If the sheet-like fibers 6 are raised before the second brush part 4 is joined to the base sheet 2, the second brush part 4 must be joined to the base sheet 2 while avoiding the raised sheet-like fibers 6. In contrast, in this embodiment, the sheet-like fibers 6 are raised after the second brush part 4 is joined to the base sheet 2, so that the manufacturing of the cleaning sheet 1 can be simplified, the yield of the cleaning sheet 1 can be improved, and the manufacturing cost of the cleaning sheet 1 can be reduced. Note that the raising process of the sheet-like fibers 6 is not limited to compressed gas, and various raising methods can be applied.

[0058] (Cutting) Following the raising process, the base sheet 2 with the first brush part 3 and the second brush part 4 joined together is cut along the X direction by a cutting device 25, thereby producing the cleaning sheet 1 shown in FIG.

[0059] The cleaning sheet 1 is not limited to the above-mentioned embodiment, and various modifications can be made. For example, a plurality of second brush parts 4 may be provided on the base sheet 2, and the first brush part 3 and the second brush part 4 may be formed on both sides of the base sheet 2.

[0060] In addition, an elastic sheet having a three-layer fiber sheet and an elastic member as disclosed in International Publication No. 2018 / 003566 may be bonded to the base sheet 2 as a third brush part, and at least one of the two first brush parts 3 may be replaced with this elastic sheet.

[0061] Furthermore, an elastic member may be provided on the airlaid sheet of the second brush part 4 to give elasticity to the second brush part 4. In this case, the pattern 9 may be provided or the pattern 9 may be omitted.

[0062] Although the cleaning sheet according to the present invention has been described in detail above, the above is merely an example of the cleaning sheet according to the present invention and is not limited thereto. Therefore, it goes without saying that appropriate modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0063] 1 cleaning sheet 1a Cleaning surface 2. Base sheet 3 First brush section 4. Second brush section 5 Both sides 6. Sheet-like fibers 7 Joint 7a 1st joint group 7b 2nd joint group 7c 3rd joint group 7d 4th joint group 8 Notch 9 Patterns 18 Pair of embossing rolls 101 Cleaning Tools 102 Head section 103 Pattern 104 Fixtures F Bed surface

Claims

1. A cleaning sheet for cleaning an object to be cleaned, A base sheet; A first brush member is a member different from the base sheet provided on one surface of the base sheet, and is formed in a state in which sheet-like fibers formed of a fibrous material are raised; a second brush member which is a member different from the base sheet and provided on one side of the base sheet, the second brush member being made of piled up crushed pulp material and having spaces formed between the fibers of the crushed pulp material for capturing the object to be cleaned.

2. The base sheet has a cleaning area for cleaning the object to be cleaned, The first brush member and the second brush member are formed in the cleaning area, The cleaning sheet according to claim 1 , wherein surfaces of the base sheet, the first brush member and the second brush member form a cleaning surface for cleaning the object to be cleaned.

3. The cleaning sheet according to claim 1 or 2, wherein the first brush member and the second brush member are formed at different positions on the base sheet.

4. The cleaning sheet according to any one of claims 1 to 3, wherein a first guide path is formed between the first brush member and the second brush member, for guiding the object to be cleaned to either the first brush member or the second brush member.

5. The cleaning sheet according to claim 1 , wherein a plurality of the first brush members are formed.

6. The cleaning sheet according to claim 5 , wherein the second brush member is formed between the first brush members, which are formed in plurality.

7. The cleaning sheet according to claim 5 or 6, wherein a second guide path is formed between the first brush members adjacent to each other, for guiding the object to be cleaned to either the first brush member or the second brush member.

8. The cleaning sheet according to claim 1 , wherein the second brush member is formed of an air-laid nonwoven fabric.

9. The cleaning sheet according to claim 8 , wherein the second brush member is formed by laminating a plurality of the air-laid nonwoven fabrics.

10. The cleaning sheet according to claim 1 , wherein the first brush member has an overall area larger than an overall area of ​​the second brush member.

11. the second brush member having a cleaning surface; The cleaning sheet according to claim 1 , wherein the cleaning surface is formed with a predetermined pattern.

12. The cleaning sheet according to claim 11 , wherein the pattern is formed along a direction different from a wiping direction of the cleaning sheet.

13. The cleaning sheet according to claim 1 , wherein the stiffness of the fibers constituting the second brush member is higher than the stiffness of the fibers constituting the first brush member.

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