Cleaning supplies and manufacturing methods for cleaning supplies

Abstract

There is a need to develop technologies that can improve the foreign object removal performance of cleaning products. [Solution] One aspect of the invention is a method for manufacturing a cleaning product comprising a polyurethane foam having a polished, cut, or slashed workpiece surface, wherein foreign matter can be removed from the workpiece surface, and the method for manufacturing a cleaning product involves heat pressing the polyurethane foam before processing the workpiece surface.

Description

[Technical Field]

[0001] This disclosure relates to cleaning supplies and methods for manufacturing them. [Background technology]

[0002] Cleaning products that remove foreign matter such as dirt and grime using polyurethane foam have been known for some time (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2019-61095 (paragraph

[0040] , Figure 1, etc.) [Overview of the project] [Problems that the invention aims to solve]

[0004] There is a need to develop technologies that can improve the foreign object removal performance of cleaning products. [Means for solving the problem]

[0005] One aspect of the invention is a method for manufacturing a cleaning product comprising a polyurethane foam having a polished, cut, or slashed workpiece surface, wherein foreign matter can be removed from the workpiece surface, the method comprising performing a heat press on the polyurethane foam before processing the workpiece surface. [Brief explanation of the drawing]

[0006] [Figure 1] Figure 1A is a perspective view of the cleaning roller according to the first embodiment, and Figure 1B is a plan view of the cleaning roller. [Figure 2] Figure 2 is a perspective view of the cleaning roller while it is cleaning the electrostatic roller. [Figure 3] Figure 3 is a cross-sectional view of line AA in Figure 1B. [Figure 4]Figure 4 is a perspective view of a plate-like body of polyurethane foam [Figure 5] Figure 5 is a side cross-sectional view of a plate-like body to be thermally pressed [Figure 6] Figure 6 is a side cross-sectional view of a thermally pressed plate-like body [Figure 7] Figure 7 is a perspective view of a thermally pressed plate-like body [Figure 8] Figure 8 is a perspective view of a square bar obtained by cutting a plate-like body [Figure 9] Figure 9A is a perspective view of a square bar with through holes formed therein, and Figure 9B is a perspective view of a square bar with a shaft inserted into the through holes [Figure 10] Figure 10 is a perspective view of a square bar whose outer peripheral surface has been shaved [Figure 11] Figure 11 is a cross-sectional view of the surface portion of a thermally pressed polyurethane foam [Figure 12] Figure 12 is a cross-sectional view of a cleaning roller in which a polyurethane foam has been shaved into a cylindrical shape and then thermally pressed [Figure 13] Figure 13 is a perspective view of the cleaning roller of the second embodiment [Figure 14] Figure 14 is a perspective view of a sheet body obtained by slicing a plate-like body [Figure 15] Figure 15 is a perspective view of a strip obtained by cutting a sheet body [Figure 16] Figure 16 is a table showing the evaluation results of cleaning supplies according to the examples and comparative examples

Mode for Carrying Out the Invention

[0007] [First Embodiment] Figures 1A and 1B show a cleaning roller 10 as a first embodiment of the cleaning supplies of the present disclosure. The cleaning roller 10 includes a shaft 11 and a polyurethane foam 12 fixed to the outer peripheral surface of the shaft 11. In the example of this embodiment, the shaft 11 is made of metal and has a round bar shape. Also, in the example of this embodiment, the polyurethane foam 12 covers a portion except both axial ends of the shaft 11 and has a cylindrical shape. For example, the shaft 11 and the polyurethane foam 12 are adhered with an adhesive (such as hot melt or double-sided tape).

[0008] As shown in FIG. 2, the cleaning roller 10 removes foreign substances (such as dust and dirt) adhering to the surface of the charging roller 90 by bringing the polyurethane foam 12 into contact with the charging roller 90. Specifically, the cleaning roller 10 is arranged parallel to the charging roller 90 and rotates with the outer peripheral surface 12M of the polyurethane foam 12 in contact with the outer peripheral surface of the charging roller 90 to remove foreign substances on the outer peripheral surface of the charging roller 90.

[0009] The polyurethane foam 12 is obtained, for example, by reacting a raw material containing a polyol, a polyisocyanate, and a foaming agent. In the example of this embodiment, the polyurethane foam 12 is a polyether-based polyurethane foam, but the polyurethane foam 12 may be a polyester-based polyurethane foam. From the viewpoint of hydrolysis resistance, the polyurethane foam 12 used for the cleaning supplies is preferably a polyether-based polyurethane foam rather than a polyester-based polyurethane foam.

[0010] In the polyether-based polyurethane foam, a polyether polyol is used as the polyol of the raw material. Examples of the polyether polyol include those obtained by adding an alkylene oxide such as ethylene oxide or propylene oxide to a polyol such as ethylene glycol, diethylene glycol, propylene glycol, glycerin, or trimethylolpropane.

[0011] Polyester-based polyurethane foams use polyester polyols as the raw material. Examples of polyester polyols include those formed by the polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid, or aromatic carboxylic acids such as phthalic acid, with polyols such as ethylene glycol, diethylene glycol, propylene glycol, and glycerin.

[0012] Examples of polyisocyanates include aromatic isocyanates (e.g., toluene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, xylylene diisocyanate, etc.), aliphatic isocyanates (e.g., hexamethylene diisocyanate), and alicyclic isocyanates (e.g., cyclohexyl diisocyanate).

[0013] Examples of blowing agents include water. Water generates carbon dioxide gas during the reaction between the polyol and polyisocyanate, and this carbon dioxide gas causes foaming. In this embodiment, the polyurethane foam 12 is a polyurethane foam obtained by chemical foaming with water as the blowing agent (so-called water-foamed polyurethane foam), and is a polyether-based polyurethane foam. Alternatively, the polyurethane foam 12 may be formed by physical foaming using hydrocarbons such as cyclopentane and isopentane as blowing agents. Alternatively, the polyurethane foam 12 may be formed by the mechanical flossing method by blowing an inert gas into the raw materials and stirring.

[0014] The apparent density of polyurethane foam 12 is 50 kg / m³. 3 Preferably, it is 55 kg / m 3 It is more preferable that it be 60 kg / m 3 It is even more preferable that the above conditions are met. A higher apparent density of the polyurethane foam 12 makes it possible to improve the foreign matter removal performance of the cleaning roller 10. In this embodiment, the polyurethane foam 12 is a hot-pressed product, and its apparent density is increased by hot pressing.

[0015] As shown in Figure 3, foam cells 18 are open on the outer surface 12M of the polyurethane foam 12. The polyurethane foam 12 has a structure in which the foam cells 18 are in communication with each other (for example, it has an open-cell structure and is breathable). In this case, the polyurethane foam 12 may be foam-molded with the foam cells 18 in communication with each other, or it may be a foam in which the cell membranes (so-called mirrors) between the foam cells 18 are removed after foam molding (so-called de-film foam). In de-film foam, only the three-dimensional network structure of the resin remains after the cell membranes are removed. The cell membranes can be removed, for example, by blowing them off with the blast of combustion gases. The polyurethane foam 12 may have a closed-cell structure as long as the foam cells 18 are open on the outer surface 12M.

[0016] As shown in Figure 3, the cleaning roller 10 removes foreign matter using the resin skeleton 13 (the resin portion of the polyurethane foam 12 excluding the foam cells 18) exposed on the outer peripheral surface 12M of the polyurethane foam 12. The resin skeleton 13 slides against the object to be cleaned (in this embodiment, the electrostatic roller 90) to remove the foreign matter (for example, by scraping it off). In this embodiment, the outer peripheral surface 12M of the polyurethane foam 12 is a processed surface that has been polished, cut, or slashed.

[0017] On the outer surface of the polyurethane foam 12, edges 13E of the resin skeleton 13 are formed between the openings of the foam cells 18. If the width W of the edges 13E of the resin skeleton 13 on the outer surface of the polyurethane foam 12 (in this embodiment, the outer peripheral surface 12M) is too wide, it becomes difficult to scrape off dirt (e.g., toner) from objects to be cleaned, such as the electrostatic roller 90. Therefore, the width W of the edges 13E is preferably 70 μm or less, more preferably 60 μm or less, and even more preferably 50 μm or less. On the other hand, if the width W of the edges 13E of the resin skeleton 13 is too narrow, durability may decrease, so it is preferably 10 μm or more. The number of foam cells 18 in the polyurethane foam 12 is preferably, for example, 50 to 100 cells / 25 mm.

[0018] In this disclosure, the width W of the edge 13E of the resin skeleton 13 is the average value of the width W of 10 edges 13E in the cross-section of the polyurethane foam 12 (see Figures 1B and 3). For example, the width W of the edge 13 can be measured by magnifying the cross-section of the polyurethane foam 12 with a microscope (for example, by 200 times).

[0019] The cleaning roller 10 of this embodiment is manufactured, for example, as follows. First, a slicing process is performed in which the polyurethane foam obtained by foam molding is sliced ​​to form a plate-like body 20A of polyurethane foam (see Figure 4). For example, in this slicing process, the polyurethane foam is sliced ​​in the horizontal direction during foam molding.

[0020] Next, a hot pressing process is performed in which the plate-like body 20A is heat-pressed. In this hot pressing process, the plate-like body 20A is compressed in the thickness direction so that it becomes thinner than its original thickness (see the change from Figure 5 to Figure 6). For example, in the hot pressing process, the plate-like body 20A is pressed by the upper die 71 and lower die 72 of the press machine, which are preheated (for example, heated to 200-250°C) (for example, pressed for 2-4 minutes). The plate-like body 20A may be preheated before being fed into the press machine.

[0021] After hot pressing, the apparent density of the plate-like material 20A is 50 kg / m³. 3 It is preferable that it be increased to the above, 55 kg / m 3 It is more preferable to raise it to 60 kg / m 3 It is even more preferable that the above values ​​are obtained. In this embodiment, the apparent density of the plate-like body 20A before hot pressing is 40 kg / m³. 3 It is less than (for example, 35 kg / m 2 The following applies: The thickness of the plate-like body 20A is preferably 25-75% of the original thickness (thickness before heat pressing) after heat pressing, and preferably 50-75%.

[0022] Next, the plate-like body 20A after heat pressing (see Figure 7) is cut into multiple rectangular bar bodies 20B in a cutting process (see Figure 8). Furthermore, a drilling process is performed in which through holes 21 extending in the longitudinal direction are formed in the rectangular bar bodies 20B (see Figure 9A). The through holes 21 can be formed, for example, by a drill.

[0023] Next, the shaft 11 is prepared and adhesive is applied to it. Then, an insertion process is performed in which the shaft 11 is inserted (for example, by press-fitting) into the through hole 21 of the rectangular bar 20B (see Figure 9B). The shaft 11 and the rectangular bar 20B are then bonded together. If hot melt adhesive is used, after the insertion process, the rectangular bar 20B into which the shaft 11 is inserted is heated, and the hot melt between the shaft 11 and the rectangular bar 20B melts. After that, cooling is performed, and the hot melt cools and solidifies, bonding the shaft 11 and the rectangular bar 20B together.

[0024] Next, a cutting process is performed in which the outer peripheral surface of the square bar 20B through which the shaft 11 passes is polished or cut (see FIG. 10). As a result, a cylindrical polyurethane foam 12 is formed, and a cylindrical outer peripheral surface 12M (machined surface) is formed (see FIG. 1). In the cutting process, for example, the outer peripheral surface of the square bar 20B is cut while rotating the shaft 11 around its axis (that is, while rotating the square bar 20B integrated with the shaft 11). Thus, the cleaning roller 10 (see FIG. 1) is obtained.

[0025] In the cleaning article (cleaning roller 10) of the present embodiment, the polyurethane foam 12 is obtained by hot pressing. Therefore, compared with the case where hot pressing is not performed, it is possible to increase the apparent density of the polyurethane foam 12, and it is possible to enhance the removal performance with respect to foreign matters on the object to be cleaned.

[0026] Here, the polyether-based polyurethane foam is less likely to be hydrolyzed than the polyester-based polyurethane foam and is preferable from the viewpoint of durability. However, it was more difficult to foam-mold it with a high density and a width W of the edge 13E of 70 μm or less. In particular, from the viewpoint of foreign matter removal performance, the apparent density of the polyurethane foam 12 is preferably 50 kg / m 3 or more. However, simply foam-molding a polyether-based polyurethane foam made it difficult to achieve an apparent density of 50 kg / m 3 or more.

[0027] On the other hand, in the present embodiment, since the foamed polyurethane foam is hot pressed, the apparent density can be increased even in the case of a polyether-based polyurethane foam. As a result, it is possible to provide a cleaning article (cleaning roller 10) that is excellent in hydrolysis resistance and also excellent in foreign matter removal performance, which was difficult to achieve in the prior art.

[0028] Here, as shown in Figure 11, on the outer surface of the heat-pressed polyurethane foam 12, the edges 13E of the resin skeleton 13 exposed on the outer surface of the polyurethane foam 12 may be crushed or bent, causing the width W of the edges 13E to widen. In this case, it becomes difficult to scrape off foreign matter from the surface of the object to be cleaned, such as the electrostatic roller 90, and the foreign matter removal performance may decrease. For example, when the outer surface of a rectangular bar body 20B through which the shaft 11 is inserted is machined to form a cylindrical polyurethane foam 12, and then heat-pressed (see Figure 12; for example, heat-pressed from the radially outside with a press mold 75), such wide edges 13E may be formed on the outer surface 12M.

[0029] In contrast, in this embodiment, after the hot pressing process, the polyurethane foam is polished or cut to form the outer surface 12M. Therefore, as described above, crushed or bent edges 13E on the outer surface of the polyurethane foam can be removed. This makes it possible to narrow the width W of the edge 13E (for example, to 70 μm or less), making it easier to scrape off foreign matter from the surface of the object to be cleaned and improving the efficiency of foreign matter removal. In particular, conventionally, it was difficult to make the width W of the edge 13E 70 μm or less in hot-pressed polyurethane foam (especially polyether-based polyurethane foam), but by performing a cutting process after the hot pressing process, it becomes possible to make the width W of the edge 13E 70 μm or less. As a result, it is possible to achieve an apparent density of 50 kg / m³ for polyurethane foam (especially polyether-based polyurethane foam), which was extremely difficult to achieve conventionally. 3 While maintaining the above, it becomes possible to make the width W of edge 13E 70 μm or less.

[0030] Furthermore, the foamed polyurethane foam may have foam cells 18 that are elongated in the vertical direction (for example, oval). In contrast, as described above, by slicing the polyurethane foam horizontally during foaming to form a plate-like body 20A, and then compressing this plate-like body 20A by heat pressing in the thickness direction, it is possible to make the foam cells 18 into a more isotropic shape (a shape closer to a circle). This makes it possible to clean the polyurethane foam 12 more uniformly in the circumferential direction.

[0031] [Second Embodiment] Figure 13 shows a cleaning roller 10 of the second embodiment. In the cleaning roller 10 of this embodiment, polyurethane foam 12 is wound spirally around the shaft 11 and fixed in place.

[0032] The cleaning roller 10 of this embodiment is manufactured, for example, as follows. First, the plate-shaped body 20A shown in Figure 7 after heat pressing is sliced ​​into multiple pieces (see Figure 14) and cut into strips to form strip-shaped bodies 20C (see Figure 15).

[0033] Next, the strip-shaped body 20C is spirally wrapped around the shaft 11 and fixed so that the cut surface 20M (workpiece surface), which is the sliced ​​surface of the strip-shaped body 20C, faces outwards. For example, an adhesive (such as hot melt or double-sided tape) is applied to the inner surface of the strip-shaped body 20C to bond the strip-shaped body 20C to the shaft 11.

[0034] The cleaning roller 10 of this embodiment can achieve the same effects as the cleaning roller 10 of the first embodiment. In this embodiment, the outer surface of the polyurethane foam 12 (the outer surface of the strip-shaped body 20C) becomes the cut surface 20M, so it is possible to narrow the edge 13E of the resin skeleton 13 exposed on the cut surface 20M (for example, it can be made 70 μm or less). This makes it possible to improve the foreign matter removal performance of the cleaning roller 10.

[0035] [Other embodiments] In the above embodiment, a cleaning roller was given as an example of the cleaning supplies of the Disclosure, but the cleaning supplies of the Disclosure are not limited to a roller and may be other than a roller. For example, the cleaning supplies may consist of a block-shaped polyurethane foam such as a rectangular parallelepiped, or they may consist of a sheet-shaped polyurethane foam. In such cases, the cleaning supplies may consist of only polyurethane foam (for example, a cleaning sponge or sheet).

[0036] In the above embodiment, the cleaning roller 10 was used for cleaning the electrostatic roller 90, but the cleaning roller 10 may also be used to remove foreign matter (such as dirt and debris) adhering to the outer surface of rollers other than the electrostatic roller 90 (for example, rollers for office automation equipment).

[0037] In the above embodiment, an elastic resin body other than polyurethane foam can be used instead of polyurethane foam 12. Such an elastic resin body may be a foam or a non-foamed material (for example, an elastic material such as rubber or a thermoplastic elastomer). [Examples]

[0038] The embodiments described above will be further explained below with reference to examples and comparative examples, but the cleaning products of this disclosure are not limited to the following examples. The cleaning rollers used as cleaning products in the examples and comparative examples were evaluated for their foreign matter removal performance, etc. (see Figure 16).

[0039] (1) Rollers of the Examples and Comparative Examples In Examples 1 and 2 and Comparative Examples 1 to 6, the shape and size of the cleaning rollers are the same, and the shaft 11 has the same configuration, but the type and manufacturing method of the polyurethane foam 12 are different. The shaft 11 is made of metal and is a round bar with a diameter of φ6 mm and a length of 360 mm. The polyurethane foam 12 is cylindrical with an outer diameter of φ10 mm and a length of 354 mm. The apparent density of the polyurethane foam 12 and the width W of the edge 13E of the resin skeleton 13 are as shown in Figure 16. In Examples 1 and 2, the polyurethane foam 12 is heat-pressed as in the first embodiment described above (see Figures 5 and 6), and then a grinding process is performed (see Figure 10). In Comparative Examples 1 to 6, the polyurethane foam 12 is not heat-pressed. The other steps in Comparative Examples 1 to 6 are the same as in Examples 1 and 2.

[0040] <Example 1> The cleaning roller in Example 1 is the cleaning roller 10 of the first embodiment described above. In the hot pressing process described above, the thickness of the polyurethane foam plate-like body 20A of the cleaning roller 10 in Example 1 is compressed from 50 mm to 15 mm. The apparent density of the plate-like body 20A before hot pressing is 21 kg / m³. 3 (The apparent density is 70 kg / m³ as shown in Figure 16) 3 (This is after hot pressing). The polyurethane foam in Example 1 is "FHA" manufactured by Inoac Corporation, and is a polyether-based polyurethane foam.

[0041] <Example 2> The cleaning roller in Example 2 is the cleaning roller 10 of the First Embodiment described above. In the hot pressing process described above, the thickness of the polyurethane foam plate-like body 20A in the cleaning roller 10 of Example 2 is compressed from 30 mm to 15 mm. The apparent density of the plate-like body 20A before hot pressing is 30 kg / m³. 3 (The apparent density is 60 kg / m³ as shown in Figure 16) 3 (This is after hot pressing). The polyurethane foam in Example 2 is "CFH-50" manufactured by Inoac Corporation, and is a polyether-based polyurethane foam.

[0042] <Comparative Example 1> The polyurethane foam 12 of the cleaning roller in Comparative Example 1 is "MF-80A" manufactured by Inoac Corporation, and is a polyester-based polyurethane foam.

[0043] <Comparative Example 2> The polyurethane foam 12 of the cleaning roller in Comparative Example 2 is "EP-70S" manufactured by Inoac Corporation, and is a polyether-based polyurethane foam.

[0044] <Comparative Example 3> The polyurethane foam 12 of the cleaning roller in Comparative Example 3 is "FHS" manufactured by Inoac Corporation, and is a polyester-based polyurethane foam.

[0045] <Comparative Example 4> The polyurethane foam 12 of the cleaning roller in Comparative Example 4 is "FHA" manufactured by Inoac Corporation, and is a polyether-based polyurethane foam.

[0046] <Comparative Example 5> The polyurethane foam 12 of the cleaning roller in Comparative Example 5 is "SM-55" manufactured by Inoac Corporation, and is a polyester-based polyurethane foam.

[0047] <Comparative Example 6> The polyurethane foam 12 of the cleaning roller in Comparative Example 6 is "CFH-50" manufactured by Inoac Corporation, and is a polyether-based polyurethane foam.

[0048] (2) Evaluation method <Foreign matter (dirt) removal performance> The electrostatic roller 90 was cleaned using the method described in the first embodiment with the cleaning rollers of each example and comparative example (see Figure 2). The removal performance of dirt (large and small dirt) attached to the surface of the electrostatic roller 90 was then visually evaluated in three stages. × was used if no removal effect was observed, ○ was used if a clear removal effect was observed (the best of the three stages), and △ was used if there was some removal effect but it was small. Large dirt was defined as dirt with a maximum length of 50 mm or more, and small dirt was defined as dirt with a maximum length of less than 50 mm. Each electrostatic roller 90 used in each example and comparative example had the same structure and was used under similar usage conditions.

[0049] <Abrasion Resistance> The cleaning roller is continuously used to clean the electrostatic roller 90, and the abrasion resistance of the outer surface 12M of the polyurethane foam 12 is visually evaluated. A circle (○) indicates that it is equivalent to Example 1, a triangle (△) indicates that it is slightly inferior, a cross (×) indicates that it is even inferior, and a double circle (◎) indicates that it is superior to Example 1.

[0050] <Pinhole effect> Using a polyurethane foam 12 with pinholes (cavities) formed in it, the difference in foreign matter removal performance between the pinhole-formed portion and the other portion is evaluated visually. ○ indicates that it is equivalent to Example 1, △ indicates that it is slightly inferior (the difference in foreign matter removal performance is large), × indicates that it is even inferior, and ◎ indicates that it is superior to Example 1 (the difference in foreign matter removal performance is small).

[0051] <Hydrolysis resistance> In evaluating resistance to hydrolysis (resistance to deterioration over time), polyether-based polyurethane foam is evaluated as ○, and polyester-based polyurethane foam is evaluated as ×.

[0052] (3) Evaluation results As shown in Figure 16, in Examples 1 and 2, where polyether-based polyurethane foam was used and a grinding process was performed after the hot pressing process, all evaluations of foreign matter removal performance, abrasion resistance, pinhole effect, and hydrolysis resistance were positive. The apparent density of the polyurethane foam 12 was 50 kg / m³. 3 In Examples 1 and 2, where the width W of the edge 13E of the resin skeleton 13 was 70 μm or less, it was confirmed that the removal performance was high for both large and small stains. In contrast, none of Comparative Examples 1 to 6 received a score of ○ or higher in all of these evaluations. In Comparative Examples 4 and 6, the apparent density of the polyurethane foam 12 was 30 kg / m³ 3 As shown below, it can be seen that the dirt removal performance is particularly low. Furthermore, in Examples 1 and 2, the polyurethane foam 12 was compressed by the heat pressing process, and it was confirmed that the effect of pinholes was smaller compared to Comparative Examples 1 to 6, in which the heat pressing process was not performed.

[0053] <Note> The following describes the features extracted from the above embodiment, explaining their effects and other aspects as needed. For ease of understanding, corresponding configurations in the above embodiment will be indicated in parentheses as appropriate, but these features are not limited to the specific configurations indicated in parentheses.

[0054] For example, the following features of this disclosure relating to cleaning supplies and their manufacturing methods can be considered to have been conceived with the background technology that, for example, "conventionally, cleaning supplies that remove foreign matter such as dirt and grime using polyurethane foam are known (see, for example, Japanese Patent Application Publication No. 2019-61095 (paragraph

[0040] , Figure 1, etc.))" and the problem that "there is a need to develop a technology that can improve the foreign matter removal performance of cleaning supplies." Furthermore, there has been a demand for novel cleaning supplies and novel manufacturing methods for cleaning supplies.

[0055] [Feature 1] A method for manufacturing a cleaning product (cleaning roller 10) comprising a polyurethane foam having a polished, cut, or cut workpiece surface (outer peripheral surface 12M), wherein foreign matter can be removed from the workpiece surface, A method for manufacturing cleaning supplies, comprising performing a heat press on the polyurethane foam before processing the surface to be processed.

[0056] [Feature 2] The aforementioned heat pressing process increases the apparent density of the polyurethane foam to 40 kg / m³. 3 Less than 50 kg / m 3 The manufacturing method for the cleaning products described in Feature 1 above.

[0057] [Feature 3] The method for manufacturing cleaning products according to feature 2, wherein the polyurethane foam is a polyether-based water-foamed polyurethane foam.

[0058] [Feature 4] The cleaning product is a cleaning roller in which polyurethane foam is fixed to the outer surface of the shaft. A cutting process in which a sheet of polyurethane foam is cut into multiple rectangular rod shapes, A drilling step to form a through hole extending in the longitudinal direction in the rectangular bar body, The insertion step involves passing the shaft through the through hole of the rectangular bar body, The process includes a grinding step of polishing or cutting the outer surface of the rectangular bar body to form the cylindrical workpiece surface, A method for manufacturing cleaning supplies according to any one of features 1 to 3, wherein the heat press is applied to the plate-like body in the thickness direction before the cutting step.

[0059] [Feature 5] The cleaning product is a cleaning roller in which polyurethane foam is fixed to the outer surface of the shaft. The process of performing the aforementioned heat press on a sheet-like polyurethane foam, The process of slicing the heat-pressed plate-like body and cutting it into strips, A method for manufacturing cleaning supplies according to any one of features 1 to 3, comprising the step of spirally winding and fixing the strip-shaped polyurethane foam (strip-shaped body 20C) onto the shaft such that the cut surface of the slice faces outward and becomes the workpiece surface.

[0060] [Feature 6] A method for manufacturing cleaning supplies according to feature 4 or 5, wherein the foamed polyurethane foam is sliced ​​horizontally in the direction during the foaming process to form the plate-like body.

[0061] [Feature 7] A cleaning product (cleaning roller 10) comprising polyurethane foam, wherein the resin skeleton exposed on the outer surface (outer peripheral surface 12M) of the polyurethane foam is capable of removing foreign matter, The aforementioned polyurethane foam is a hot-pressed product, The width of the edge of the resin skeleton on the outer surface is 70 μm or less. The apparent density of the polyurethane foam is 50 kg / m³ 3 These are the cleaning supplies.

[0062] Based on the above characteristics, it becomes possible to improve the foreign matter removal performance of cleaning products.

[0063] While this specification and drawings disclose specific examples of the technology included in the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and changes to these examples, as well as parts of the examples taken individually. [Explanation of Symbols]

[0064] 10 Cleaning rollers 11 shafts 12 Polyurethane foam 12M outer surface 13 Resin skeleton 13E Edge 18 foam cells 20A Plate-shaped body 20B square rod 20C zooid 20M cutting surface 21 Through hole 71 Upper mold 72 Lower mold 90 Light-Emitting Roller W width

Claims

1. A method for manufacturing a cleaning product comprising a polyurethane foam having a polished, cut, or slashed workpiece surface, wherein foreign matter can be removed from the workpiece surface, A method for manufacturing cleaning supplies, comprising performing a heat press on the polyurethane foam before processing the surface to be processed.

2. The aforementioned heat pressing process increases the apparent density of the polyurethane foam to 40 kg / m³. ３ Less than 50 kg / m ３ The method for manufacturing cleaning supplies as described in claim 1 above.

3. The method for manufacturing cleaning products according to claim 2, wherein the polyurethane foam is a polyether-based water-foamed polyurethane foam.

4. The cleaning product is a cleaning roller in which polyurethane foam is fixed to the outer surface of the shaft. A cutting process in which a sheet of polyurethane foam is cut into multiple rectangular rod shapes, A drilling step to form a through hole extending in the longitudinal direction in the rectangular bar body, The insertion step involves passing the shaft through the through hole of the rectangular bar body, The process includes a grinding step of polishing or cutting the outer surface of the rectangular bar body to form the cylindrical workpiece surface, A method for manufacturing cleaning supplies according to claim 1 or 2, wherein the plate-like body is subjected to the heat press in the thickness direction before the cutting step.

5. A method for manufacturing cleaning supplies according to claim 4, wherein the foamed polyurethane foam is sliced ​​in the horizontal direction during the foaming process to form the plate-like body.

6. The cleaning product is a cleaning roller in which polyurethane foam is fixed to the outer surface of the shaft. The process of performing the aforementioned heat press on a sheet-like polyurethane foam, The process of slicing the heat-pressed plate-like body and cutting it into strips, A method for manufacturing cleaning supplies according to claim 1 or 2, comprising the step of spirally winding and fixing the strip-shaped polyurethane foam onto the shaft such that the cut surface of the slice faces outward and becomes the workpiece surface.

7. A cleaning product comprising polyurethane foam, wherein a resin skeleton exposed on the outer surface of the polyurethane foam is capable of removing foreign matter, The aforementioned polyurethane foam is a hot-pressed product, The width of the edge of the resin skeleton on the outer surface is 70 μm or less. The apparent density of the polyurethane foam is 50 kg / m³. ３ These are the cleaning supplies.

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