Patent GB-1225269-A (GB)
IPC: F16C13/00
Filed: 1968-03-04
Abstract: 1,225,269. Coated roller. McCREARY TIRE & RUBBER CO. 4 March, 1968, No. 10478/ 68. Heading B2E. [Also in Division F2] A roller for use in a corrosive environment includes a core structure, a corrosion resistant layer adhered thereto, a layer of glass fibre material adhered to the resin layer, a second layer of the resin impregnating and coating the glass fibre material, a layer of a mat formed from at least one of fibrous crocidilite, asbestos or vinyl chloride-acrylonitrile copolymer covering the second resin layer and a further layer of the resin impregnating and covering the mat layer. The resin material may be a polyester, phenolic, or epoxy resin. The roller may be used for handling steel strip during rolling and pickling operations. A resilient covering may be adhered to the reinforced resin coating, e.g. elastomeric material such as silicone, polyurethan, neoprene, natural rubber, chlorosulphonated polyethylene rubber, butyl rubber, ethylenepropylene-cyclopentadiene copolymer, styrene-butadiene, nitryl and acrylonitrile rubbers. As shown in Figure 1, a roller 10 includes a shaft 12 extending axially through a cylindrical metal core 16 supported at its ends by annular discs 18. The shaft is journalled at each end and an additional journal portion 15 is provided adjacent one of the journals 14 for mounting a drive pulley, or sprocket for rotating the roll. The journals are first wrapped with masking tape, the remaining portions of the roll are de-greased, sand-blasted and a corrosion-resistant coating 26, preferably a polyester resin activated for either air or heat curing, applied by painting or spraying, optionally after the application of a primer coating. A layer of fibrous reinforcing material, e.g. fibreglass, is applied to the work and end surfaces of the roll and to the exposed shanks 22 of the shaft 12 before the resin has hardened, and further resin applied and worked into the interstices of the mat to impregnate the material and to leave a coating 30 thereover. Second and third layers 34 and 36 of fibrous reinforcing material are subsequently applied in a similar manner. A lesser number of reinforced plastics layers can be applied to end discs 18 and shaft shanks 22 and to the work surface 24 of the roll. A layer of vinyl chlorideacrylonitrile copolymer cloth 40 is applied to the last resin coating 38 before the latter has completely set, and a final coating 42 of the resin applied and worked into the interstices of the cloth. The reinforced resin layer 40-42 is then grit-blasted preferably to expose some of the reinforcing fibres 40, roll machined to ensure symmetry, and a resilient covering 44 applied. The resilient covering 44 can be formed from neoprene acid-resistant rubber using a solution of neoprene rubber in toluol as a bonding agent. Natural, nitrile or silicone rubber can be adhered by applying a primer 46, a coating 48 of a cement material 50. At least one of the coats 46, 58 may be applied when the roll is to be utilised without a resilient covering 44. After the covering 44 has been applied the roll 10 is wrapped with cotton webbing and placed for curing of the rubber in a steam autoclave.