# US 12,178,374 B2 · Cleaning sheet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,178,374 B2 - Document ID: US12178374B2 - Status: Granted - Kind: B2 - Application number: 17/046,145 - Filed: 2019-04-10 - Published: 2021-02-04 - Granted: 2024-12-31 - Earliest claimed: 2018-04-10 - Applicants: Kikuo Yamada - Inventors: Kikuo Yamada - Web page: https://patentgrep.com/patent/US12178374B2 ## CPC - A47L 13/16: Cloths; Pads; Sponges (metal scraping sponges A47L13/07) - A47L 13/38: Other dusting implements {(using adhesive surfaces A47L25/005)} - B32B 1/08: Tubular products - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - B32B 5/266: {next to one or more non-woven fabric layers} - D04H 1/26: Wood pulp - D04H 1/54: by welding together the fibres, e.g. by partially melting or dissolving (in combination with needling D04H1/485) - D04H 1/58: by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives (in combination with needling D04H1/488) - B32B 2432/00: Cleaning articles, e.g. mops or wipes - A47L: DOMESTIC WASHING OR CLEANING (brushes A46B; cleaning quantities of bottles or of other hollow articles of one kind B08B9/00; laundry D06F); SUCTION CLEANERS IN GENERAL (cleaning in general B08) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) ## Abstract A cleaning sheet that is capable of reliably capturing dust without damaging a cleaning target surface regardless of size and the like of dust falling on the cleaning target surface is described. The cleaning sheet for cleaning a cleaning target object includes a base material sheet, a first brush portion that is provided to the base material sheet and is formed of a fiber material, and a second brush portion that is provided to the base material sheet and is formed of crushed pulp materials that are layered. ## Claims ### Claim 1 A cleaning sheet for cleaning a cleaning target object, comprising: a base material sheet having a first surface; a fibrous web formed of a fiber material that includes a first part that is bonded to the first surface of the base material sheet and a second part that includes first brush portions, wherein the first brush portions include: a first group of spaced apart first brush portions formed in a row in a Y direction measured along a length of the cleaning sheet, and a second group of spaced apart first brush portions formed in a row in the Y directon and that is spaced apart from the first group of the first brush portions; and a second brush portion that is provided to the first surface of the base material sheet and is formed of crushed pulp materials that are layered, wherein the second brush portion is located between, and spaced apart from, an entirety of the first group of the first brush portions and an entirety of the second group of the first brush portions with respect to an X direction that is measured transverse to the Y direction along a width of the cleaning sheet, wherein a height of the second brush portion as measured from the first surface is greater than a height of the first part of the fibrous web as measured from the first surface, and wherein a rigidity of a fiber constituting the second brush portion is greater than a rigidity of a fiber constituting the first brush portions. ### Claim 2 (depends on 1) The cleaning sheet according to claim 1, wherein: the base material sheet has a cleaning region for cleaning the cleaning target object, the first brush portions and the second brush portion are formed in the cleaning region, and the first surface of the base material sheet, a surface of the first brush portions, and a surface of the second brush portion form a cleaning surface for cleaning the cleaning target object. ### Claim 3 (depends on 1) The cleaning sheet according to claim 1, wherein the second brush portion is located in a center part of the base material sheet so as to be interposed between the first group of the first brush portions and the second group of the first brush portions. ### Claim 4 (depends on 1) The cleaning sheet according to claim 1, wherein a first guide path that guides a removal target object to the first brush portions or the second brush portion is formed between the first brush portions and the second brush portion. ### Claim 5 (depends on 1) The cleaning sheet according to claim 1, wherein the first brush portions in the first group are sequentially shifted from the first brush portions in the second group in the Y direction. ### Claim 6 (depends on 5) The cleaning sheet according to claim 5, wherein the second brush portion extends in the Y direction parallel to the first group of the first brush portions and the second group of the first brush portions. ### Claim 7 (depends on 5) The cleaning sheet according to claim 5, wherein a second guide path that guides a removal target object to the first brush portions or the second brush portion is formed between the first brush portions adjacent to each other. ### Claim 8 (depends on 1) The cleaning sheet according to claim 1, wherein the second brush portion is formed of an air-laid non-woven fabric. ### Claim 9 (depends on 8) The cleaning sheet according to claim 8, wherein the second brush portion is formed of the air-laid non-woven fabric layered in plural. ### Claim 10 (depends on 1) The cleaning sheet according to claim 1, wherein a total area of the first brush portions is greater than an area of the second brush portion. ### Claim 11 (depends on 1) The cleaning sheet according to claim 1, wherein: the second brush portion has a cleaning surface, and a pattern is formed on the cleaning surface. ### Claim 12 (depends on 11) The cleaning sheet according to claim 11, wherein the pattern extends along a direction different from the X direction measured along the width of the cleaning sheet. ### Claim 13 (depends on 1) The cleaning sheet according to claim 1, wherein the second brush portion has a space for capturing a foreign object, the space being formed between the crushed pulp materials. ### Claim 14 (depends on 6) The cleaning sheet according to claim 6, wherein a second guide path that guides a removal target object to the first brush portions or the second brush portion is formed between the first brush portions adjacent to each other. ### Claim 15 (depends on 2) The cleaning sheet according to claim 2, wherein a total area of the first brush portions is greater than an area of the second brush portion. ### Claim 16 (depends on 2) The cleaning sheet according to claim 2, wherein: the second brush portion has a cleaning surface, and a pattern is formed on the cleaning surface. ### Claim 17 (depends on 16) The cleaning sheet according to claim 16, wherein the pattern extends along a direction different from the X direction measured along the width of the cleaning sheet. ### Claim 18 (depends on 2) The cleaning sheet according to claim 2, wherein the second brush portion has a space for capturing a foreign object, the space being formed between the crushed pulp materials. ### Claim 19 (depends on 16) The cleaning sheet according to claim 16, wherein the second brush portion is located in a center part of the base material sheet so that the second brush portion bisects the first group and the second group. ### Claim 20 (depends on 1) The cleaning sheet according to claim 1, wherein the first brush portions are made of a material different than that of the second brush portion.