# US 5,705,446 A · Wide endless belt > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,705,446 A - Document ID: US5705446A - Status: Granted - Kind: A - Application number: 08/259,516 - Filed: 1994-06-14 - Granted: 1998-01-06 - Earliest claimed: 1993-06-18 - Assignees: Mitsuboshi Belting Ltd. - Inventors: Kazutoshi Fujishiro; Yasuo Sumiyoshi; Masaaki Asazuma; Hiroshi Katsura - Web page: https://patentgrep.com/patent/US5705446A ## CPC - B31F 1/2877: {Pressing means for bringing facer sheet and corrugated webs into contact or keeping them in contact, e.g. rolls, belts} - B29C 70/088: {and with one or more layers of non-plastics material or non-specified material, e.g. supports} - B65G 15/34: with reinforcing layers, e.g. of fabric - D21F 1/0036: {Multi-layer screen-cloths} - B65G 2201/02: Articles - Y10T 428/24562: Interlaminar spaces - Y10T 428/24579: with particulate matter - Y10T 428/24603: Fiber containing component - Y10T 428/24612: Composite web or sheet - Y10T 428/24636: Embodying mechanically interengaged strand[s], strand-portion[s] or strand-like strip[s] [e.g., weave, knit, etc.] - Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.] - Y10T 442/3472: Woven fabric including an additional woven fabric layer - Y10T 442/3602: Three or more distinct layers - Y10T 442/3642: At least one layer contains natural or synthetic rubber - Y10T 442/365: At least one layer is a preformed synthetic polymeric film or sheet - Y10T 442/3878: Fluorinated olefin polymer or copolymer sheet or film [e.g., Teflon@, etc.] - B31F: MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making layered products not composed wholly of paper or cardboard B32B) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D) - D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An endless belt having an inside surface, an outside surface, a length and a width. The belt has a canvas core layer, an elastomer layer outside of the canvas core layer, a surface canvas layer that is expansible lengthwise of the belt outside of the elastomer layer, and structure applied on the surface canvas layer and exposed on the outside surface of the endless belt to resist bonding of foreign material thereto. ## Claims ### Claim 1 An endless belt having an inside surface, an outside surface, a length, and a width, said endless belt comprising: a canvas core layer; an elastomer layer outside of the canvas core layer; a surface canvas layer that is expansible lengthwise of the belt outside of the elastomer layer; and means applied on the surface canvas layer and exposed on the outside surface of the endless belt to resist bonding of foreign material thereto. ### Claim 2 (depends on 1) The endless belt according to claim 1 wherein the belt width is 1200 to 3000 mm and the thickness between the inside and outside surfaces of the belt is less than 3.5 mm. ### Claim 3 (depends on 1) The endless belt according to claim 1 wherein the canvas core layer is seamless along the length thereof. ### Claim 4 (depends on 1) The endless belt according to claim 1 wherein the canvas core layer is seamless along the width thereof. ### Claim 5 (depends on 1) The endless belt according to claim 1 wherein the canvas core layer is woven from at least one of a) aromatic polyamide fiber thread and b) polyether ether ketone fiber thread. ### Claim 6 (depends on 1) The endless belt according to claim 1 wherein the canvas core layer is defined by warp cords having a density of 10-50 cords per 5 cm of belt width and weft cords having a density of 10-50 cords per 5 cm of belt length. ### Claim 7 (depends on 6) The endless belt according to claim 6 wherein the density of cords is within .+-.0.5 cords/5 cm throughout the entire length and width of the canvas core layer. ### Claim 8 (depends on 6) The endless belt according to claim 6 wherein the warp and weft cords are woven by one of a) plain weaving, b) mat weaving, c) twilling, and d) satin weaving. ### Claim 9 (depends on 6) The endless belt according to claim 6 wherein at least one of the warp and weft cords is defined by fiber filaments combined to produce yarns having a denier of 1000-2000, with the at least one of the warp and weft cords defined by 2-10 yarns. ### Claim 10 (depends on 9) The endless belt according to claim 9 wherein the yarns are twisted 50-100 times/m. ### Claim 11 (depends on 9) The endless belt according to claim 9 wherein there are warp cords that are made up of S direction cords and Z direction cords. ### Claim 12 (depends on 11) The endless belt according to claim 11 wherein the warp cords are made up of S direction cords and Z direction cords alternatingly along the width of the belt. ### Claim 13 (depends on 1) The endless belt according to claim 1 wherein the surface canvas layer is one of a) plain woven, b) twilled, and c) satin weave canvas. ### Claim 14 (depends on 1) The endless belt according to claim 1 wherein the surface canvas layer is defined by warp and weft cords and the warp cords are defined by a blended thread including aromatic polyamide fiber and urethane elastic fiber. ### Claim 15 (depends on 1) The endless belt according to claim 1 wherein the surface canvas layer is defined by warp and weft cords and the weft cords are made from at least one of a) aromatic polyamide fiber thread, b) nylon fiber thread, and c) polyester fiber thread. ### Claim 16 (depends on 1) The endless belt according to claim 1 wherein the surface canvas layer is a knitted fabric made from aromatic polyamide fiber thread. ### Claim 17 (depends on 1) The endless belt according to claim 1 wherein the surface canvas layer is defined by warp and weft cords with at least one of the warp and weft cords defined by a) 1-3 twisted threads of 100-300 denier made from para base aramid fiber and b) Number 20-40 spun yarn defined by 1-4 twisted threads made from meta base aramid fiber. ### Claim 18 (depends on 17) The endless belt according to claim 17 wherein the threads of the warp cords are blended with urethane elastic fiber thread having a denier of 140 per thread with there being 100-140 threads per 5 cm. ### Claim 19 (depends on 15) The endless belt according to claim 15 wherein at least one of the nylon fiber thread and polyester fiber thread has a denier of 100-300, with there being 1-3 twisted threads of the at least one of the nylon fiber thread and polyester fiber thread in the weft cords. ### Claim 20 (depends on 19) The endless belt according to claim 19 wherein there is at least one of the nylon fiber thread and polyester fiber thread with there being 70-100 threads per 5 cm in the weft cords. ### Claim 21 (depends on 5) The endless belt according to claim 5 wherein the aromatic polyamide fiber is at least one of a) para base aramid fiber that includes fibers that are sold under at least one of the commercial names TWARON.TM., KEVLAR.TM., and TECHNORA.TM., and b) meta base aramid fiber that includes fibers that are sold under at least one of the commercial names CORNEX.TM.and NOMEX.TM.. ### Claim 22 (depends on 1) The endless belt according to claim 1 wherein the elastomer layer comprises one of a rubber and synthetic resin. ### Claim 23 (depends on 22) The endless belt according to claim 22 wherein there are reinforcing fibers embedded in the elastomer layer, said reinforcing fibers having a length of 2-20 mm and being present in the elastomer layer in an amount of 5-30 weight parts per 100 weight parts of the one of rubber and synthetic resin. ### Claim 24 (depends on 23) The endless belt according to claim 23 wherein the reinforcing fibers are at least one of aromatic polyamide, cotton and polyester. ### Claim 25 (depends on 1) The endless belt according to claim 1 wherein the means applied on the surface canvas layer comprises a coating on the surface canvas layer. ### Claim 26 (depends on 25) The endless belt according to claim 25 wherein the coating is a blend of an elastomer with powdered fluorine plastic. ### Claim 27 (depends on 25) The endless belt according to claim 25 wherein the coating is approximately 0.01-0.5 mm thick. ### Claim 28 (depends on 26) The endless belt according to claim 26 wherein at least one of the elastomer layer and the elastomer in the coating is a heat resistant elastomer that is at least one of rubber and synthetic resin. ### Claim 29 (depends on 26) The endless belt according to claim 26 wherein the fluorine plastic is at least one of 4-ethylene fluoride, 3-ethylene fluoride, 2-ethylene fluoride, and a fluorine plastic having a melting point below 200.degree. C. which is melted at the vulcanization temperature of the elastomer. ### Claim 30 (depends on 26) The endless belt according to claim 26 wherein the fluorine plastic is present in an amount of 300-1000 parts per 100 parts of elastomer. ### Claim 31 (depends on 26) The endless belt according to claim 26 wherein the coating is applied in an amount of 100-500 g/m.sup.2. ### Claim 32 (depends on 1) The endless belt according to claim 1 wherein the outside surface of the belt has a coefficient of friction of less than 0.3 with respect to iron. ### Claim 33 (depends on 1) The endless belt according to claim 1 wherein the belt has a strength of at least 400 kgf/cm of belt width. ### Claim 34 (depends on 1) The endless belt according to claim 1 wherein the belt has an elastic coefficient in the lengthwise direction of at least 8000 kgf/cm of width at a temperature range of between 23.degree. and 150.degree. C. ### Claim 35 (depends on 1) The endless belt according to claim 1 wherein the creep elongation of the belt is less than 2.5% at 23.degree. C. and less than 4.0% at 150.degree. C. under a load of 50 kgf/cm of belt width. ### Claim 36 (depends on 1) The endless belt according to claim 1 wherein the ratio between the lengthwise elastic coefficient and the widthwise elastic coefficient for the belt is between 0.7 and 1.5. ### Claim 37 (depends on 1) The endless belt according to claim 1 wherein the elastomer layer comprises at least one of styrene butadiene rubber, ethylene propylene rubber, butyl rubber, fluororubber, hydrogenated nitrile rubber, and polytetra fluoroethylene. ### Claim 38 (depends on 26) The endless belt according to claim 26 wherein at least one of the elastomer layer and the elastomer in the coating is at least one of a) hydrogenated nitrile rubber, b) styrene butadiene rubber, c) ethylene propylene rubber, d) butyl rubber, e) fluororubber, and f) polytetra fluoroethylene.