Patent application number | Description | Published |
20090072443 | PU ROLLER - The invention relates to a method for producing a roller shell or roller lining of a roller made from a PPDI-based polyurethane plastic. The green strength shortcomings are to be overcome as quickly as possible to prevent stress cracks by the fact that the hardener added to the polyurethane shortens the working life to 5 to 60 seconds. The invention also relates to a PPDI polyurethane for the production of a roller shell or roller lining of a roller made by mixing a PPDI prepolymer with a hardener, in particular to carry out the method, wherein it is important that the hardener consists of 60 to 99% 1,4-butanediol, a maximum of 40% diamine, and at most 1% catalyst. | 03-19-2009 |
20100190624 | PU-ROLL AND METHOD TO PRODUCE SAME - The present invention relates to a method for producing a roller shell or roller covering of a roller from a PPDI-based polyurethane. To avoid stress cracks, the intention is to overcome the inadequacy in green strength as quickly as possible by the hardener that is added to the polyurethane bringing the pot time down to 5 to 60 seconds. The present invention also relates to a PPDI polyurethane for producing a roller shell or roller covering of a roller formed by mixing a PPDI prepolymer with a hardener, in particular for carrying out the method, wherein 60 to 99% by weight of the hardener is 1,4-butane diol, at most 40% by weight is diamine and at most 1% by weight is a catalyst. | 07-29-2010 |
20130345035 | PAPER MACHINE ROLLER WITH FIBER BRAGG SENSORS - A roller for use in paper machines includes a roller core, a roller covering surrounding the roller core, and at least one optical waveguide having a plurality of fiber Bragg gratings. The at least one optical waveguide is either arranged between the roller core and the roller covering or is embedded in the roller covering. Sections of the at least one optical waveguide which each contain a fiber Bragg grating alternate with sections of the at least one optical waveguide which are free of fiber Bragg gratings in the longitudinal direction of the optical waveguide. Sections of the at least one optical waveguide which each contain a fiber Bragg grating also enclose an angle with a circumferential direction to the roller of less than 80°, for example less than 60°, or less than 45°. | 12-26-2013 |
20140374460 | ROLL WITH SENSORS FOR A MACHINE FOR PRODUCING AND/OR PROCESSING A MATERIAL WEB AND MACHINE FOR PRODUCING AND/OR PROCESSING A MATERIAL WEB - A roll for a machine for processing a material web, in particular a paper, cardboard, or tissue machine, has a cylindrical roll core and a roll cover which is arranged on the radially outer lateral face of the roll core. The roll cover has a functional layer and a connecting structure which lies radially between the roll core and the functional layer. The radially outer lateral face of the functional layer provides a contact surface which can be brought into contact with the material web or a covering. A plurality of pressure and/or temperature-sensitive sensors are embedded in the roll cover. The sensors are arranged in the connecting structure or at the interface between the connecting structure and the functional layer. | 12-25-2014 |
20150013927 | MACHINE FOR PRODUCING A FIBER WEB - A machine for producing and/or processing a fiber web, in particular a tissue web, includes a press roll and a mating roll which forms a nip with the press roll and the circumferential surface of which has a contour running in the cross-machine direction which, during operation of the machine, changes as compared with when the machine is at a standstill. The press roll has a roll core and a roll cover surrounding the roll core. Multiple pressure and/or temperature sensors are disposed in the roll cover and/or between the roll core and the roll cover. The pressure and/or temperature sensors are spaced apart differently far from one another in the cross-machine direction of the press roll, at least in some areas. | 01-15-2015 |
20150051318 | ROLL COVER PRODUCTION METHOD AND ROLL COVER - A roll cover is produced, in particular for use in a machine for producing and/or processing a fibrous web such as a web of paper or cardboard. The roll cover includes least one layer of a resin matrix that is filled with at least one particulate filler. The filler particles are produced in a polymer component of the resin matrix and/or introduced into the resin matrix from a dispersion via matrix exchange. | 02-19-2015 |
20150090133 | ROLL COVER - A roll cover is particular suited for use in an apparatus for producing or surface finishing a fibrous web, such as a web of paper or of cardboard. The roll cover is formed on a roll core of metal or of a fiber-reinforced plastic and includes a matrix system wherein fillers are provided. The fillers provided are three or more in number and they have different median particle sizes. | 04-02-2015 |
20150148206 | ROLLER, AND METHOD FOR MANUFACTURING THE SAME - A roller is particularly suited for use in a machine for manufacturing and/or finishing a fibrous web, such as a paper web or cardboard web. The roller includes a roller core and, configured thereon, a roller covering. The covering has at least one layer of a resin material with at least one fiber material embedded therein. The at least one layer has an outer surface that is suitable for coming into direct or indirect contact with the fibrous web. The at least one fiber material here comprises fibers having a linear weight from 0.5 to 5 dtex, preferably from 0.5 to 2 dtex. | 05-28-2015 |