Patent Publication Number: US-11382482-B2

Title: Cleaning sheet

Description:
FIELD 
     The present invention relates to a cleaning sheet. 
     BACKGROUND 
     Conventionally, a cleaning sheet used for cleaning such as cleaning a floor surface is formed in raised and sunken shapes with various patterns in order to increase volume, improve its thickness, reduce frictional resistance and improve dust collection properties. 
     For example, Patent Literature 1 describes forming the raised and sunken shapes by providing a V-shaped low-density area in a sheet fiber. 
     Patent Literature 1: Japanese Patent Publication No. 3,559,533 
     SUMMARY 
     According to the technique of Patent Literature 1, since the strength of the sheet is reduced due to the low-density area, the sheet may be twisted and torn during cleaning and therefore, collection properties may be degraded. 
     The object of the present invention is to provide the cleaning sheet which exhibits excellent collection properties while maintaining the strength of the sheet. 
     The embodiments herein disclose a cleaning sheet that is replaceably attached to a flat cleaning tool forming a cleaning surface covering the bottom surface of the cleaning tool, locked to the upper surface of the cleaning tool by bending along longitudinal edge sections of the cleaning tool, and having embossed sections compressed in the thickness direction and uncompressed non-embossed sections that embossed sections and non-embossed sections are arranged alternately along bent sections folding along the longitudinal edge sections. 
     According to the embodiments, it is possible to provide the cleaning sheet which exhibits excellent collection properties while maintaining the strength of the sheet. 
     The embodiments herein further disclose that the multiple non-embossed sections are arranged at predetermined intervals along the bent sections. 
     According to the embodiments, it is possible to further improve the collection properties. 
     The embodiments herein further disclose that each of the non-embossed sections is configured having opened sunken part with respect to the longitudinal edge sections of the cleaning tool when attached to the cleaning tool. 
     According to the embodiments, it is possible to further improve the collection properties. 
     The embodiments herein further disclose that each of the non-embossed sections is configured extending in the diagonal direction with respect to the longitudinal edge sections of the cleaning tool when attached to the cleaning tool. 
     According to the embodiments, it is possible to further improve the collection properties. 
     The embodiments herein further disclose that the non-embossed sections arranged along the bent section corresponding to one of the longitudinal edge sections of the cleaning tool and the non-embossed sections arranged along the bent section corresponding to the other longitudinal edge sections of the cleaning tool are arranged in the different positions with respect to the extending direction of the bent sections. 
     According to the embodiments, it is possible to further improve the collection properties. 
     The embodiments herein further disclose that the embossed section includes a first raised part projecting from the sheet surface and a second raised part projecting from the top portion of the first raised part. 
     According to the embodiments, it is possible to further improve the collection properties. 
     According to the present invention, it is possible to provide the cleaning sheet which exhibits excellent collection properties while maintaining the strength of the sheet. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a view showing a state of using a cleaning sheet of the embodiment. 
         FIG. 2  is a plan view showing an example of the cleaning sheet. 
         FIG. 3  is a cross-sectional view taken along a line III-III of  FIG. 2 . 
         FIG. 4  is an enlarged view of a portion A in  FIG. 2 . 
         FIG. 5  is a cross-sectional view taken along a line V-V in  FIG. 4 . 
         FIG. 6A  is a view showing a modified example of a non-embossed section. 
         FIG. 6B  is a view showing the modified example of the non-embossed section. 
         FIG. 6C  is a view showing the modified example of the non-embossed section. 
         FIG. 6D  is a view showing the modified example of the non-embossed section. 
         FIG. 7  is a view showing the modified example of the non-embossed section. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, detailed aspects of a cleaning sheet  100  according to an embodiment of the invention is described while referring to  FIGS. 1 to 5 . However, the technical scope of the invention is not limited to illustrated examples. 
     For convenience, as shown in  FIGS. 1 to 5 , X direction, Y direction, Z direction, front and rear, left and right and up and down are defined and described. 
     Structure of Embodiment 
       FIG. 1  is a view showing a state of using a cleaning sheet  100  of the embodiment. 
     As shown in  FIG. 1 , the cleaning sheet  100  is a dry sheet exchangeably attached to a cleaning tool  200  including, for example, a rectangular flat head section  201  and a handle section  202  attached to an upper surface of the head section  201 . 
     The cleaning sheet  100  covers a bottom surface of the head section  201  of the cleaning tool  200  to form a cleaning surface and is bent along longitudinal edge sections  201   a  of the head section  201  of the cleaning tool to be locked and attached to the upper surface of the head section  201 . 
     The longitudinal edge sections  201   a  refer to the edge sections in a longitudinal direction of the head section  201 . That is, they refer to two long edge sections out of four edges of the rectangular head section  201 . 
       FIG. 2  is a plan view showing an example of the cleaning sheet  100  of the embodiment. 
     As shown in  FIG. 2 , the cleaning sheet  100  has a rectangular shape elongated in the X direction and is formed to have a size of, for example, 250 mm to 300 mm, preferably 260 mm to 290 mm in the X direction (the longitudinal direction) and 180 mm to 230 mm, preferably 200 mm to 210 mm in the Y direction (the short direction). 
       FIG. 3  is a cross-sectional view taken along a line III-III in  FIG. 2 . 
     The cleaning sheet  100  is a sheet that a plurality of base papers are layered and has a layer-structure including outer layers  11  and  11  forming surface layers of the cleaning sheet  100  and an inner layer  12  between the outer layers  11  and  11  as shown in  FIG. 3 , for example. 
     The outer layer  11  is mainly formed of hydrophobic fibers. Hydrophobic fibers may be chemical fibers mainly containing polyethylene terephthalate, polypropylene, polyethylene or similar chemicals. 
     The mixing ratio of polyethylene terephthalate fiber for the outer layer  11  is preferably 80% or more and the fiber diameter is preferably 3.3 dtex or more. By setting the fiber diameter to 3.3 dtex or more, rigidity (cushioning property) of the fiber is improved so that it can be operated even with a light force. 
     Non-woven fabric such as polypropylene spun bond may be used for the inner layer  12 . Further, the same hydrophobic fibers as applied for the outer layer  11  may be used and hydrophilic fibers such as pulp, cotton, hemp, rayon or acetate may be appropriately contained. 
     The sheet structure of the cleaning sheet  100  described above is merely an example, and the number of layers and fibers contained in each layer may be changed as appropriate. 
     Returning to  FIG. 2 , in the cleaning sheet  100 , sections which are folded along the longitudinal edge sections  201   a  of the head section  201  of the cleaning tool  200  are referred to as bent sections S. 
     An approximate position of the bent sections S is set in advance in accordance with the head section  201  of the specified cleaning tool  200 . That is, two rows of the bent sections S extending in the X direction are set at predetermined positions in the Y direction of the cleaning sheet  100 . A straight line corresponding to the bent sections S may be printed on the cleaning sheet  100  or a polygonal line corresponding to the bent sections S may be formed on the cleaning sheet  100  in advance, for example, so that a user can recognize the bent sections S. 
     Then, a plurality of non-embossed sections  30  are arranged at predetermined intervals in the X direction along the bent sections S of the cleaning sheet  100 , and embossed sections  20  are arranged over the entire area except areas in which the non-embossed sections  30  of the cleaning sheet  100 . 
     Thus, the embossed sections  20  and the non-embossed sections  30  are alternately arranged at positions corresponding to the longitudinal edge sections  201   a  of the head section  201  of the cleaning tool  200  in the cleaning sheet  100 . 
     (Embossed Section) 
     The embossed section  20  is a part of the cleaning sheet  100  in which the sheet is compressed in the thickness direction thereof. 
     The embossed section  20  may be formed by heat embossing under conditions of a temperature of 80 to 150° C. and an embossing pressure of 0.2 to 1.0 MPa. 
       FIG. 4  is an enlarged view of a portion A in  FIG. 2 . Further,  FIG. 5  is a cross-sectional view taken along a line V-V in  FIG. 4 . 
     As shown in  FIGS. 4 and 5 , the embossed part  20  is formed with a raised emboss  21  projecting upward (projecting to one surface side of the cleaning sheet  100 ) and a sunken emboss  22  projecting downward (projecting to the other surface side of the cleaning sheet  100 , that is, being recessed). 
     The raised emboss  21  and the sunken emboss  22  are alternately arranged in both the X and Y directions. By alternately arranging the raised emboss  21  and the sunken emboss  22  regularly as described above, dust collection properties may be improved. 
     An intermediate section  23  is formed between the raised emboss  21  and the sunken emboss  22  alternately arranged in the embossed section  20 . The intermediate section  23  is a portion in which the raised emboss  21  and the sunken emboss  22  are not formed, and thus the intermediate section  23  is positioned lower than the raised emboss  21  and higher than the sunken emboss  22  in the Z direction. 
     Note that it is not essential to have the embossed pattern described above. Although an effect of improving the dust collection properties may be reduced, an embossed pattern may be such that the raised embosses  21  or the sunken embosses  22  are arranged in a line or irregularly arranged. Further, for example, it may include only either the raised embosses  21  or the sunken embosses  22 . 
     (Raised Emboss) 
     As shown in  FIG. 4 , the raised emboss  21  is formed in a so-called gourd shape having a narrow width in the X direction and a constricted portion in a central portion in the Y direction in plan view. Although the configuration describe above is preferable from the viewpoint of dust collection properties, a shape of the raised emboss  21  is not limited and may be formed into various shapes such as a circle, an ellipse, and a polygon. Further, the shapes may be combined. 
     The raised emboss  21  is formed 2 mm to 5 mm, preferably 3 mm to 4 mm in the X direction, and 5 mm to 10 mm, preferably 6 mm to 8 mm in the Y direction, and 0.5 mm to 2 mm, preferably 0.7 mm to 1.5 mm (height from the intermediate section  23 ) in the Z direction. 
     As shown in  FIG. 5 , the raised emboss  21  is formed in a shape projecting upward in a step-wise manner in a cross-sectional view. That is, in the cross-sectional view, a second raised part  21   b  projecting further upward is formed on a top portion of a first raised part  21   a  projecting from the surface (an upper surface) of the sheet. With such a structure, the cushioning property of the cleaning sheet  100  may be improved. 
     (Sunken Emboss) 
     As shown in  FIG. 4 , the sunken emboss  22  is formed in the so-called gourd shape which is substantially the same shape as the raised emboss  21  in plan view. The shape of the sunken emboss  22  is not limited and may be formed into various shapes or may be a different shape from the raised emboss  21 . 
     Further, as shown in  FIG. 5 , the sunken emboss  22  is formed in a shape constricted downward in a stepwise manner, which is the shape upside down with the raised emboss  21  in the cross-sectional view. That is, in the cross-sectional view, a second sunken part  22   b  projecting further downward is formed at a top portion of a first sunken part  22   a  projecting from the surface (a lower surface) of the sheet. With such a structure, the cushioning property of the cleaning sheet  100  may be improved. 
     (Non-Embossed Section) 
     The non-embossed section  30  is a part of the cleaning sheet  100  in which the sheet is not compressed in the thickness direction but has raised fibers, and the plurality of non-embossed sections  30  are arranged along the rows of the bent sections S of the cleaning sheet  100 . 
     The non-embossed section  30  is formed by designing an embossing roll forming the embossed section  20  so as to exclude the shape of the non-embossed section  30 . 
     The non-embossed section  30  is not limited to a case where compression is not performed at all, but it may be lightly compressed as compared with a portion in which the embossed section  20  is compressed to an extent that the raised fibers remain. 
     A size of the non-embossed section  30  is formed 40 to 70 mm, preferably 50 to 60 mm in the X direction, and 15 to 70 mm, preferably 20 to 50 mm in the Y direction. 
     With such setting, when forming a folded line corresponding to the bent section S of the cleaning sheet  100  in production, the folded line can be formed at an appropriate position even when the folded line is meandered by an apparatus. 
     (Sunken Part) 
     Each of the non-embossed sections  30  preferably has a shape having a sunken part  31  open to the longitudinal edge section  201   a  of the head section  201  in a state where the cleaning sheet  100  is attached to the cleaning tool  200 . 
     Specifically, for example, as shown in  FIG. 2 , the non-embossed sections  30  may be formed in a V-shape in plan view, which is open toward the right direction or the left direction, that is, open to a long side from the central portion of the rectangular cleaning sheet  100 . That is, if the non-embossed section  30  has the V-shape in plan view, it has a V-shaped sunken part  31 . 
     Thus, when cleaning is performed by moving the cleaning sheet  100  in the Y direction, that is, in a direction parallel to a short side of the cleaning sheet  100 , dust is easily accumulated in the sunken part  31  so that the dust collection properties may be further improved. 
     Further, as shown in  FIG. 2 , the non-embossed sections  30  are arranged so that positions in the X direction are shifted for each row and alternate with each other. That is, the non-embossed sections  30  along the bent section S corresponding to one of the longitudinal edge sections  201   a  of the head section  201  and the non-embossed sections  30  along the bent section S corresponding to the other longitudinal edge section  201   a  of the head section  201  are arranged at different positions in an extending direction of the bent sections S. 
     Thus, when cleaning is performed by moving the cleaning sheet  100  in the Y direction, that is, in the direction parallel to the short side of the cleaning sheet  100 , the collection properties are mutually complemented, and the non-embossed sections  30  pass through a floor surface without a gap, so that the dust collection properties may be improved. 
     (Method of Using Cleaning Sheet) 
     Next, a method of using the cleaning sheet  100  will be described. 
     In use, the cleaning sheet  100  is attached to the rectangular flat head section  201  of the cleaning tool  200 . 
     Specifically, the head section  201  is placed on the cleaning sheet  100  such that the longitudinal edge sections  201   a  of the head section  201  are aligned with the two rows of the bent sections S extending in the X direction of the cleaning sheet  100 . Next, the cleaning sheet  100  is folded along the longitudinal edge sections  201   a  of the head section  201 , and both sides of the folded sheet are locked to the upper surface of the head section  201 . 
     Thus, for example, as shown in  FIG. 1 , the central portion in the Y direction of the cleaning sheet  100  covers the bottom surface of the head section  201  of the cleaning tool  200  to form the cleaning surface, and the embossed sections  20  and the non-embossed sections  30  are alternately arranged in the cleaning sheet  100  at the positions corresponding to the longitudinal edge sections  201  a of the head section  201 , that is, along the bent sections S. 
     In this state, when cleaning is performed by moving the cleaning sheet  100  mainly in the Y direction, that is, in the short direction of the cleaning sheet  100 , the embossed sections  20  can scrape fine dust such as sand dust and house dust, and the raised fibers of the non-embossed sections  30  can capture coarse dust such as hair and fiber dust. 
     More specifically, the coarse dust accumulates in the sunken part  31  of the non-embossed sections  30 , and the fine dust can be scraped off by the embossed sections  20  between the non-embossed sections  30  and the embossed sections  20  disposed on the cleaning surface. 
     The embossed sections  20  is gradually crushed at the second raised section  21   b  and then the first raised section  21   a  (or the second sunken part  22   b  and then the first sunken part  22   a ) with progress of cleaning work, and an area of the cleaning surface is gradually increased. Therefore, it is possible to use it for a long time. 
     In addition, because the basis weight of each section of the cleaning sheet  100  does not need to be changed in order to form the embossed sections  20  and the non-embossed sections  30 , the strength of the cleaning sheet  100  is maintained and therefore, the cleaning sheet  100  will not be twisted or torn during cleaning. 
     Effect of Embodiment 
     As described above, the cleaning sheet  100  according to the embodiment is a cleaning sheet attached to the flat head section  201  of the cleaning tool  200  exchangeably, formed the cleaning surface by covering the bottom surface of the head section  201 , locked to the upper surface of the head section  201  by bending along the longitudinal edge sections  201   a  of the head section  201 , and arranged with the embossed sections  20  compressed in the thickness direction and the uncompressed non-embossed sections  30  alternately along the bent sections S folding along the longitudinal edge sections  201   a.    
     Thus, since the basis weights of the embossed sections  20  and the non-embossed sections  30  are the same, the strength of the cleaning sheet  100  is maintained and each section collects the fine dust and coarse dust respectively, and therefore, the dust collection properties may be improved. 
     Further, according to the embodiment, a plurality of non-embossed sections  30  are arranged at predetermined intervals along the bent sections S. 
     Thus, the collection area of the coarse dust is formed at predetermined intervals along the longitudinal edge sections  201   a  of the head section  201 , and therefore, the dust collection properties may be further improved. 
     According to the embodiment, each of the non-embossed sections  30  has a shape having a sunken part  31  open to the longitudinal edge section  201   a  of the head section  201  in a state where it is attached to the head section  201 . 
     Thus, dust is easily accumulated in the sunken part  31  so that the dust collection properties may be further improved. 
     According to the embodiment, the non-embossed section  30  along the bent section S corresponding to one of the longitudinal edge sections  201   a  of the head section  201  and the non-embossed section  30  along the bent section S corresponding to the other longitudinal edge section  201   a  of the head section  201  are arranged at different positions in an extending direction of the bent sections S. 
     Thus, when moving the head section  201  in the orthogonal direction to the extending direction of the bent sections S, the collection properties of the non-embossed section  30  arranged along the bent section S corresponding to one of the longitudinal edge sections  201   a  of the head section  201  and the non-embossed section  30  arranged along the bent section S corresponding to the other longitudinal edge section  201   a  of the head section  201  are mutually complemented respectively and the dust collection properties may be improved. 
     According to the embodiment, the embossed section  20  includes the first raised part  21   a  (the first sunken part  22   a ) projecting from the sheet surface and the second raised part  21   b  (the second sunken part  22   b ) further projecting from the top portion of the first raised part  21   a  (the first sunken part  22   a ). 
     Thus, the embossed section  20  is gradually crushed and the area of the cleaning surface is gradually increased, and therefore, it is possible to maintain the collection properties for a long time. 
     The present invention is not limited to the embodiment described above, and it is needless to say that the specific structure may be changed as appropriate. 
     For example, in the embodiment above, the V-shaped non-embossed sections  30  is described as an example, however, the shape of the non-embossed sections  30  is not limited to this as long as it is a shape having the sunken part  31  open to the longitudinal edge section  201   a  of the head section  201  in a state of being attached to the head section  201 . 
     For example, as shown in  FIGS. 6A and 6B , it may be a U-shaped non-embossed section  30  having a U-shaped sunken part  31 . 
     In addition, as shown in  FIG. 6C , it may be a substantially circular non-embossed section  30  having a V-shaped sunken part  31  formed in a part thereof, or as shown in  FIG. 6D , a part of a star-shaped non-embossed section  30  may be used to function as the sunken part  31 . 
     The shape of the non-embossed section  30  is most preferably a shape having the sunken part  31  open to the longitudinal edge section  201   a  of the head section  201  as described above from the viewpoint of collection properties, but as shown in  FIG. 7 , it may be a shape extending in a direction oblique to the longitudinal edge section  201   a  of the head section  201 . 
     With such a shape, the non-embossed section  30  is disposed obliquely to the longitudinal edge section  201   a  of the head section  201 , so that it is possible to collect dust. 
     In the embodiment above, a case where cleaning is performed by moving the cleaning sheet  100  in the Y direction thereof has been described as an example, however, the non-embossed section  30  may be formed to have a shape open to the short side from the central portion of the rectangular cleaning sheet  100  in consideration of cleaning by moving the cleaning sheet  100  in a direction parallel to the long side of the cleaning sheet  100 . 
     In this case, the cleaning sheet  100  is folded along the short edge sections of the head section  201  (the edge sections along the short direction of the head section  201 ), and both ends of the folded sheet are locked to the upper surface of the head section  201 . 
     In the embodiment above, the cleaning sheet  100  is described as a dry sheet, however, a wet sheet with a chemical solution may be used. In this case, water retentive layer such as pulp, for example, is preferably used for the inner layer  12 . 
     EXAMPLES 
     Next, Examples and Comparative Examples of the present invention will be described. Hereinafter, the invention will be specifically described by way of Examples, but the invention is not limited thereto. 
     &lt;Preparation of Samples&gt; 
     Example 1 
     As the outer layer, a non-woven fabric made of 100% hydrophobic fibers containing 80% of polyethylene terephthalate fibers and 20% of core-sheath fibers of polypropylene and polyethylene as binder fibers was prepared. The polyethylene terephthalate fiber having a fineness of 3.3 dtex and the binder fiber having a fineness of 1.7 dtex were used. 
     As the inner layer, a spun bond non-woven fabric of 100% polypropylene was prepared. 
     The outer layer and the inner layer described above were entangled by the hydroentangling method to produce the laminated sheet which is a span lace non-woven fabric having a three-layer structure. 
     The laminated sheet was embossed at a temperature of 105° C. and an embossing pressure of 0.6 MPa to produce a rectangular dry sheet having the embossed section and the non-embossed section as shown in  FIG. 2  and was used as the cleaning sheet of Example 1. 
     The basis weight of the cleaning sheet was 100 gsm, and the measurements of the long side was 300 mm and the short side was 200 mm. 
     In the embossed section, the gourd-shaped raised emboss and sunken emboss are alternately arranged in both the long side direction and the short side direction, and sizes of the raised emboss and the sunken emboss were both 8 mm in the long side, 3 mm in the short side, and 0.8 mm in height in the projecting direction thereof. 
     The non-embossed section had the V-shape in plan view, which is open to the long side from the central portion of the cleaning sheet, the entire length in the long side direction of the non-embossed section was 45 mm, and the entire length in the short side direction was 35 mm. A length of the longest part in the long side direction of spaces formed by the sunken part of the non-embossed section was 20 mm. A distance between the non-embossed sections adjacent in the long side direction was 10 mm. 
     Comparative Example 1 
     Except changing the shape of the non-embossed section, with respect to the laminated sheet which is the same as Example 1, the dry sheet was produced having the embossed sections and the non-embossed sections by embossing under the same condition and was used as the cleaning sheet of Comparative Example 1. 
     The shape of the non-embossed section was a square with 10 mm length in the long side and short side directions. 
     The lengths between the non-embossed sections adjacent in the long side direction are set to be 10 mm and 20 mm which are arranged alternately. 
     Comparative Example 2 
     With respect to the entire surface of the laminated sheet which is the same as Example 1, the dry sheet was produced by embossing under the same condition as Example 1 and was used as the cleaning sheet of Comparative Example 2. 
     Comparative Example 3 
     The dry sheet of the same laminated sheet as Example 1 was produced without embossing and was used as the cleaning sheet of Comparative Example 3. 
     &lt;Evaluation of Folded Line&gt; 
     When processing the folded lines as a guidance for the bent sections of the cleaning sheet of Example 1 and Comparative Example 1, whether or not the folded lines were drawn without shifting from the rows of the non-embossed sections was determined by visual views and evaluated according to the following criteria. The results are shown in Table 1. 
     Excellent: No shifting 
     Good: Almost no shifting 
     Fair: Some shifting 
     Poor: Shifting 
     &lt;Evaluation of Fitability&gt; 
     When attaching the cleaning sheet of Example 1 and Comparative Example 1 to the cleaning tool as shown in  FIG. 1 , whether or not the edge sections and non-embossed sections of the cleaning tool were fit without shifting from the lines (whether or not the embossed sections and non-embossed sections were arranged alternately along the bent sections folded along the edge sections) was determined by visual views and evaluated according to the following criteria. The results are shown in Table 1. 
     Excellent: No shifting 
     Good: Almost no shifting 
     Fair: Some shifting 
     Poor: Shifting 
     &lt;Evaluation of Collection Properties&gt; 
     Next, with the cleaning sheets of Example 1 and Comparative Examples 1 to 3 attached to the cleaning tool as shown in  FIG. 1 , the tool was moved in the short side direction of the cleaning sheet for cleaning, and the dust collection properties were evaluated. 
     The cleaning tool used herein included the head section to which the cleaning sheet was attached and the handle section as shown in  FIG. 1 . 
     The head section was configured by attaching a top surface portion and a bottom surface portion, the top surface portion had a rectangular shape with a long side of 240 mm and a short side of 95 mm made of ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin), and the bottom portion had a rectangular shape with a long side of 248 mm and a short side of 98 mm made of TPE (thermoplastic elastomer) having a hardness of 70°. 
     A length of the handle section was the length from a coupling portion with the head section to a tip end of a handle cap and was 215 mm. 
     In addition, under a state where the cleaning sheet of Example 1 was attached by folding along the edge sections of the head section of the cleaning tool in the long side direction, the non-embossed sections and the embossed sections were arranged alternately on the bent sections as the non-embossed sections became 10 mm and the embossed sections became 10 to 20 mm. 
     Under a state where the cleaning sheet of Comparative Example 1 was attached to the head section of the cleaning tool as the same as the sheet of Example 1, the non-embossed sections and the embossed sections were arranged on the bent sections as the non-embossed sections became 10 mm and the embossed sections became 10 to 20 mm. 
     It is noted that only embossed sections were arranged on the bent sections for the cleaning sheet of Comparative Example 2 and only non-embossed sections were arranged on the bent sections for the cleaning sheet of Comparative Example 3. 
     Criteria for evaluation are as follows. The results are shown in Table 1. 
     Excellent: Satisfied 
     Good: Almost satisfied although some dust or the like remained 
     Fair: Not satisfied much because dust remained 
     Poor: Not satisfied at all because dust was not collected well 
     &lt;Comprehensive Evaluation&gt; 
     Based on the three evaluations, comprehensive evaluation was performed according to the following criteria. The results are shown in Table 1. 
     Good: Only Excellent or Excellent and Good 
     Fair: Including one or more Fair 
     Poor: Including one or more Poor 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                   
                 Collection 
                 Comprehensive 
               
               
                   
                 Folded Line 
                 Fitability 
                 Properties 
                 Evaluation 
               
               
                   
               
             
            
               
                 Example 1 
                 Good 
                 Excellent 
                 Excellent 
                 Good 
               
               
                 Comparative 
                 Fair 
                 Good 
                 Good 
                 Fair 
               
               
                 Example 1 
                   
                   
                   
                   
               
               
                 Comparative 
                 — 
                 — 
                 Fair 
                 Fair 
               
               
                 Example 2 
                   
                   
                   
                   
               
               
                 Comparative 
                 — 
                 — 
                 Poor 
                 Poor 
               
               
                 Example 3 
               
               
                   
               
            
           
         
       
     
     The results of Table 1 show that the attachment of the sheet of Example 1 to the tool was excellent and the dust collection properties were also excellent. 
     Even though the dust collection properties of the sheet of Comparative Example 1 at the bent sections are better than samples of Comparative Example 2 and 3, since the dimension of the entire length of the non-embossed sections in the short side direction is short, the sheet of Comparative Example 1 may be shifted when attaching to the tool, and therefore, the non-embossed sections and the embossed sections at the bent sections may not be arranged alternately. 
     The cleaning sheet with only the embossed sections such as Comparative Example 2 was found to be inefficient for the collection properties at the bent section. 
     In addition, the collection properties of the cleaning sheet with only the non-embossed sections such as Comparative Example 3 was found to be poor at the bent section. This may be because of the negative influence on the collection properties at the central portion of the head section that the dust may be accumulated at the edges. 
     The chemical solution was applied to the dry sheets of Example 1 and Comparative Examples 1 to 3 so that an impregnation rate was 270% to produce the wet sheets, and the same evaluation was carried out. The results were the same for the wet sheets. 
     The present invention is suitable for providing a cleaning sheet used for cleaning a floor surface and others.