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Cleaning sheet and method of makingRelated Patent Categories: Stock Material Or Miscellaneous Articles, Structurally Defined Web Or Sheet (e.g., Overall Dimension, Etc.), Continuous And Nonuniform Or Irregular Surface On Layer Or Component (e.g., Roofing, Etc.), Particulate MatterCleaning sheet and method of making description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060240223, Cleaning sheet and method of making. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD [0001] The present invention relates generally to cleaning sheets that are used, for example, to clean floors, countertops or furniture. BACKGROUND [0002] Wipes and cleaning sheets are known. Japanese Kokai Patent Application No. 2002-17639, for example, discloses a cleaning sheet consisting of a base sheet and fiber layer provided with raised fibers on the cleaning surface side of the base sheet. The cleaning surface of the sheet has a structure comprising the fiber layer. The cleaning surface has adhesive, and the spaces between the raised fibers form free areas capable of collecting material from the surface to be cleaned. [0003] Japanese Kokai Patent Application No. HEI 11-253382 discloses a dust removal sheet having a sheet-like base material and an adhesive layer formed on the base material used for trapping dust on the floor, etc. The sheet includes a dust trapping layer consisting of a sheet-like fiber material having voids between the fibers that is laminated onto the adhesive layer to cover the adhesive layer. [0004] The industry, however, is always seeking improved wipes. It would be desirable to provide a cleaning sheet that is easy and inexpensive to make, is easy to handle and use, is durable, has superior cleaning capability, and does not create unwanted noise when moved across the surface to be cleaned. SUMMARY OF THE INVENTION [0005] The present invention provides a cleaning sheet including a substrate having opposed major surfaces, an adhesive on at least a portion of at least one of the substrate major surfaces, and loose fibers arranged on the adhesive, wherein at least one of the individual loose fibers contacts the substrate at more than one point. In one aspect, the fibers are arranged randomly. In another aspect, the loose fibers have an average length of at least about 25 millimeters. In another aspect, the loose fibers are crimped. In yet another aspect, a majority of the loose fibers contact the substrate and/or the adhesive at more than one point. In a more particular aspect, the adhesive is a pressure sensitive adhesive. [0006] In one embodiment, the region of the cleaning sheet having loose fibers defines a fiber layer having a basis weight of no greater than about 20 g/m.sup.2. In another embodiment, the fiber layer has an average thickness of no greater than about 3 millimeters. [0007] In another embodiment, at least one major surface of the substrate has a macroscopically three-dimensional surface topography. In another embodiment, the loose fibers are arranged over the macroscopically three-dimensional surface and define an outward surface of the cleaning sheet that is macroscopically planar. [0008] In a specific embodiment, the present invention provides a disposable cleaning sheet including a fibrous spunbond nonwoven substrate having a basis weight ranging from about 40 g/m.sup.2 to about 60 g/m.sup.2, the substrate including at least one major surface having a three-dimensional surface topography; a pressure sensitive adhesive coated onto at least a portion of at least one of the substrate major surfaces; and a layer of crimped loose fibers arranged randomly on the adhesive surface of the substrate, wherein the layer of loose fibers has a basis weight of no greater than about 20 g/m.sup.2, the loose fibers have an average length of at least about 25 millimeters, the loose fibers project perpendicularly outwardly from the substrate a distance of no greater than about 5 millimeters, the majority of the loose fibers contact the substrate at more than one point, and the loose fibers define a macroscopically planar outward surface of the cleaning sheet. [0009] In another aspect, the present invention provides a method of making a cleaning sheet by providing a web of material having an adhesive coated on at least a portion the web, and randomly depositing loose fibers on the web at least in the regions of the adhesive, thereby attaching the loose fibers to the web. The web of material is preferably a nonwoven web of fibrous material. [0010] The loose fibers may be deposited using staple fiber handling equipment such as carding equipment (e.g. a Hergeth or Garnett card ), aerodynamic web forming equipment (e.g. a Rando machine), or a lickerin roll in combination with a blower. In addition, the loose fibers may be forced against the web. In a more specific aspect, the loose fibers are applied to the substrate at a generally constant thickness, and the loose fibers define an outward surface that is macroscopically planar. BRIEF DESCRIPTION OF THE DRAWINGS [0011] The present invention will be further described with reference to the accompanying drawings, in which: [0012] FIG. 1 perspective view of a cleaning sheet according to the invention; [0013] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; [0014] FIG. 3 is a cross-sectional view of a second embodiment of the invention; [0015] FIG. 4 is a perspective view of a third embodiment of the invention; [0016] FIG. 5 is perspective view of a fourth embodiment of the invention; [0017] FIG. 6 is a schematic representation of an apparatus for making the cleaning sheets of FIGS. 1-3; and [0018] FIG. 7 is a schematic representation of an apparatus for making the cleaning sheets of FIGS. 4 and 5. DETAILED DESCRIPTION [0019] Referring now to the drawings, wherein like reference numerals refer to like or corresponding features throughout the several views, FIGS. 1-2 show a cleaning sheet or wipe 10 including a backing layer or substrate 12 having opposed bottom and top major surfaces 18, 20, adhesive 14 on the top surface 20 of the substrate 12, and loose fibers 16 arranged on the adhesive 14. Continue reading about Cleaning sheet and method of making... Full patent description for Cleaning sheet and method of making Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cleaning sheet and method of making patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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