Patents by Inventor Hans Loser
Hans Loser has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8382955Abstract: A method for operating a sheet-forming unit of a papermaking machine. At least one fibrous material suspension is fed to a headbox and is conducted in a plurality of turbulence-generating channels to form sub-flows, and fed to a nozzle. From the nozzle, the at least one fibrous material suspension is in the form of a free jet into the forming unit to define an impingement line. In a final fluidization region of an individual turbulence-generating channel a pressure loss (?p) of ?50 mbar is generated within the fibrous material suspension before inlet thereof into the nozzle, and the fibrous material suspension is guided from the final fluidization region as far as the impingement line in such a way that the dwell time of the suspension in the region defined by the final fluidization region as far as the impingement line ranges from >30 ms to ?300 ms.Type: GrantFiled: February 10, 2012Date of Patent: February 26, 2013Assignee: Voith Patent GmbHInventors: Markus Häussler, Hans Loser, Volker Schmidt-Rohr, Wolfgang Ruf, Thomas Ruehl
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Patent number: 8236138Abstract: The invention relates to a headbox for a machine for producing a fibrous web, in particular a paper or cardboard web, from at least one fibrous stock suspension, having a feed apparatus which feeds the at least one fibrous stock suspension, having a distributor-pipe perforated plate which is adjacent downstream and has a multiplicity of channels which are arranged in rows and in columns, having an intermediate channel which lies downstream of the latter, extends over the width of the headbox and has a plurality of means which are spaced apart from one another in the width direction of the headbox for the preferably regulatable/controllable metering of a fluid in fluid part streams into the at least one fibrous stock suspension.Type: GrantFiled: May 31, 2011Date of Patent: August 7, 2012Assignee: Voith Patent GmbHInventors: Marco Thomisch, Wolfgang Ruf, Volker Schmidt-Rohr, Markus Häubler, Hans Loser
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Publication number: 20120193059Abstract: A method for operating a sheet-forming unit of a papermaking machine. At least one fibrous material suspension is fed to a headbox and is conducted in a plurality of turbulence-generating channels to form sub-flows, and fed to a nozzle. From the nozzle, the at least one fibrous material suspension is in the form of a free jet into the forming unit to define an impingement line. In a final fluidization region of an individual turbulence-generating channel a pressure loss (?p) of ?50 mbar is generated within the fibrous material suspension before inlet thereof into the nozzle, and the fibrous material suspension is guided from the final fluidization region as far as the impingement line in such a way that the dwell time of the suspension in the region defined by the final fluidization region as far as the impingement line ranges from >30 ms to ?300 ms.Type: ApplicationFiled: February 10, 2012Publication date: August 2, 2012Inventors: Markus Häussler, Hans Loser, Volker Schmidt-Rohr, Wolfgang Ruf, Thomas Ruehl
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Publication number: 20120186767Abstract: A headbox includes a feed device feeding the fibrous material suspension, a nozzle, and a turbulence-generating device. The fibrous material suspension is guided in the turbulence-generating device in sub-flows through turbulence-generating channels. Within the individual turbulence-generating channel of the turbulence-generating device, at least one region forming a fluidization region is provided, in which a pressure loss can be generated in the sub-flow of the fibrous material suspension guided through said region. The nozzle and the turbulence-generating device are designed and dimensioned such that they are suitable for setting a dwell time of ?200 ms of the fibrous material suspension flowing through the same from a final fluidization region of an individual turbulence-generating channel before inlet into the nozzle as far as the outlet gap of the nozzle, and a pressure loss of ?50 mbar in the final fluidization region upstream of the inlet into the nozzle.Type: ApplicationFiled: February 10, 2012Publication date: July 26, 2012Inventors: Hans Loser, Markus Häussler, Volker Schmidt-Rohr, Wolfgang Ruf
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Publication number: 20110290440Abstract: The invention relates to a headbox for a machine for producing a fibrous web, in particular a paper or cardboard web, from at least one fibrous stock suspension, having a feed apparatus which feeds the at least one fibrous stock suspension, having a distributor-pipe perforated plate which is adjacent downstream and has a multiplicity of channels which are arranged in rows and in columns, having an intermediate channel which lies downstream of the latter, extends over the width of the headbox and has a plurality of means which are spaced apart from one another in the width direction of the headbox for the preferably regulatable/controllable metering of a fluid in fluid part streams into the at least one fibrous stock suspension.Type: ApplicationFiled: May 31, 2011Publication date: December 1, 2011Inventors: Marco Thomisch, Wolfgang Ruf, Volker Schmidt-Rohr, Markus Häussler, Hans Loser
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Patent number: 6890408Abstract: Headbox for one of a paper and cardboard machine includes at least one material suspension supply running a width of the machine. At least one turbulence producer has at least one conduit through which a material suspension flows. At least one metered addition point is located in the conduit for introducing a fluid medium. A headbox nozzle is located downstream from the at least one turbulence producer for delivering the material suspension. A portion of a flow resistance located downstream of the metered addition point is at least approximately 50% of a total flow resistance of the at least one conduit.Type: GrantFiled: August 23, 2002Date of Patent: May 10, 2005Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleiter
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Patent number: 6761801Abstract: Lamella and headbox of a web production machine. The lamella is formed of at least one high-performance polymer. The at least one high-performance polymer includes high stability, high heat resistance, and good to very good resistance to at least one of alkaline solution and acid. The headbox includes the lamella.Type: GrantFiled: October 17, 2001Date of Patent: July 13, 2004Assignee: Voith Paper Patent GmbHInventors: Wolfgang Ruf, Hans Loser
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Publication number: 20030159790Abstract: Process for forming and a headbox for producing a fibrous material web from a pulp suspension to form one of a paper or cardboard web. The headbox includes a headbox nozzle and at least one lamella, and the process includes providing a structured surface with at least one structure one of in and on a surface of the at least one lamella, such that the structured surface is arranged to generate cross flows inside the pulp suspension, whereby the cross flows lead to shear flows in the suspension stream.Type: ApplicationFiled: February 26, 2003Publication date: August 28, 2003Applicant: VOITH PAPER PATENT GMBHInventors: Wolfgang Ruf, Hans Loser
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Patent number: 6602388Abstract: Process of forming a headbox for a machine, which includes arranging a plurality of headbox channels into rows and columns, positioning a lamella between adjacent rows, fixing an end of the lamella at a fixing point, and arranging lamellar supports downstream of, relative to a headbox flow direction, the fixing point.Type: GrantFiled: September 11, 2002Date of Patent: August 5, 2003Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Wolfgang Ruf, Hans Loser, Thomas Dietz, Klaus Lehleiter, Konstantin Fenkl
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Patent number: 6585860Abstract: Method for regulating a basis weight of a paper or cardboard web in the manufacturing process. The method includes determining a basis weight at an end of the manufacturing process, calculating a deviation of the determined basis weight from a predetermined target value, adjusting a concentration of a material suspension supplied to a headbox via a first control loop such that the calculated deviation is corrected, one of directly and indirectly measuring a basis weight of a resulting web in a region upstream, with regard to a web travel direction, a drying section, and supplying a signal related to the measured basis weight to a second control loop.Type: GrantFiled: February 22, 2002Date of Patent: July 1, 2003Assignee: Voith Sulzer Papiermaschinen GmbHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleiter
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Patent number: 6524441Abstract: Process and a device for detecting a change in the fiber orientation cross-direction profile of a paper or cardboard web in the manufacturing process on a paper or cardboard machine. It is recognized that a change in the fiber orientation cross-direction profile in the web is inferred or determined by way of a characteristic change in the basis weight cross-direction profile or at least one measurement quantity that correlates to it, and/or by way of a characteristic change in the basis weight in the travel direction of the web or at least one measurement quantity that correlates to it. The device includes an arrangement for detecting a change in the basis weight cross-direction profile and/or a characteristic chronological course of the change in the basis weight, which is characteristic for a change in the fiber orientation.Type: GrantFiled: December 1, 2000Date of Patent: February 25, 2003Assignee: Voith Sulzer Papiermaschinen GmbHInventors: Wolfgang Ruf, Hans Loser, Ulrich Begemann, Klaus Lehleiter
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Publication number: 20030005565Abstract: Process of forming a headbox for a machine, which includes arranging a plurality of headbox channels into rows and columns, positioning a lamella between adjacent rows, fixing an end of the lamella at a fixing point, and arranging lamellar supports downstream of, relative to a headbox flow direction, the fixing point.Type: ApplicationFiled: September 11, 2002Publication date: January 9, 2003Applicant: Voith Sulzer Papiertechnik Patent GmbHInventors: Wolfgang Ruf, Hans Loser, Thomas Dietz, Klaus Lehleiter, Konstantin Fenkl
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Publication number: 20030000674Abstract: Headbox for one of a paper and cardboard machine includes at least one material suspension supply running a width of the machine. At least one turbulence producer has at least one conduit through which a material suspension flows. At least one metered addition point is located in the conduit for introducing a fluid medium. A headbox nozzle is located downstream from the at least one turbulence producer for delivering the material suspension. A portion of a flow resistance located downstream of the metered addition point is at least approximately 50% of a total flow resistance of the at least one conduit.Type: ApplicationFiled: August 23, 2002Publication date: January 2, 2003Applicant: VOITH SULZER PAPIERTECHNIK PATENT GMBHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleitter
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Patent number: 6471828Abstract: Headbox for a machine and process for forming the same. The headbox includes a plurality of channels arranged in rows that extend across a width of the machine and in columns substantially perpendicular to the rows, at least one lamella positioned between adjacent rows, a fixing point for the at least one lamella, and lamellar supports positioned after the fixing point, relative to a headbox flow. This includes arranging a plurality of headbox channels into rows and columns, positioning a lamella between adjacent rows, fixing an end of the lamella at a fixing point, and arranging lamellar supports downstream of, relative to a headbox flow direction, the fixing point.Type: GrantFiled: June 9, 2000Date of Patent: October 29, 2002Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Wolfgang Ruf, Hans Loser, Thomas Dietz, Klaus Lehleiter, Konstantin Fenkl
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Publication number: 20020153113Abstract: Lamella of a headbox through which at least one fibrous suspension flows. The headbox has a machine-width headbox nozzle with a nozzle length and an exit opening, and the headbox nozzle is delimited by an upper nozzle wall and a lower nozzle wall. The lamella, which is structured and arranged to be mounted within the headbox nozzle, includes a lamella body having a downstream Lamella end structured and arranged to be positioned downstream, relative to a suspension flow direction, of an opposite end of the lamella body, and the downstream lamella end includes a first surface, a portion coupled to an sloped relative to the first surface, and a second surface, located opposite the first surface, provided with a structure.Type: ApplicationFiled: February 12, 2002Publication date: October 24, 2002Applicant: VOITH PAPER PATENT GmbHInventors: Wolfgang Ruf, Konstantin Fenkl, Hans Loser
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Headbox and process for the metered addition of a fluid medium into a suspension stream of a headbox
Patent number: 6464837Abstract: Process for a metered addition of a fluid medium into a material suspension stream of a headbox, including feeding the material suspension in a main flow direction through at least one turbulence-producing conduit to a headbox nozzle, the at least one turbulence-producing conduit having an entrance, a graduated pressure loss area, and an exit. A total pressure loss &Dgr;Ptotal is caused in the at least one turbulence-producing conduit such that the total pressure loss &Dgr;Ptotal includes at least one intake pressure loss &Dgr;Pintake formed at the entrance and a graduated pressure loss &Dgr;Pgrad formed at the graduated pressure loss area. A metered addition of a fluid medium is also provided in a region between the entrance and the exit.Type: GrantFiled: February 3, 2000Date of Patent: October 15, 2002Assignee: Voith Sulzer Papiertechnik Patent GmbHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleiter -
Publication number: 20020124981Abstract: A method and machine for the manufacturing a fibrous pulp web including forming a first draining zone and a second draining zone which are successively arranging in a web run direction, applying pressure in the first drainage zone which increases in the web run direction from an initial pressure to a final pressure to drain one side of the web, and applying pressure in the second drainage zone which increases in the web run direction from an initial pressure to a final pressure to drain the other side of the web. The initial pressure in the second draining zone is less than the final pressure in the first draining zone.Type: ApplicationFiled: May 1, 2001Publication date: September 12, 2002Applicant: VOITH SULZER PAPIERMASCHINEN GmbHInventors: Joachim Henssler, Hans Loser, Karl Steiner, Albrecht Bauder
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Publication number: 20020117282Abstract: Method for regulating a basis weight of a paper or cardboard web in the manufacturing process. The method includes determining a basis weight at an end of the manufacturing process, calculating a deviation of the determined basis weight from a predetermined target value, adjusting a concentration of a material suspension supplied to a headbox via a first control loop such that the calculated deviation is corrected, one of directly and indirectly measuring a basis weight of a resulting web in a region upstream, with regard to a web travel direction, a drying section, and supplying a signal related to the measured basis weight to a second control loop.Type: ApplicationFiled: February 22, 2002Publication date: August 29, 2002Applicant: Voith Sulzer Papiermaschinen GmbHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleiter
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Publication number: 20020043355Abstract: Lamella and headbox of a web production machine. The lamella is formed of at least one high-performance polymer. The at least one high-performance polymer includes high stability, high heat resistance, and good to very good resistance to at least one of alkaline solution and acid. The headbox includes the lamella.Type: ApplicationFiled: October 17, 2001Publication date: April 18, 2002Applicant: VOITH PAPER PATENT GMBHInventors: Wolfgang Ruf, Hans Loser
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Patent number: 6368461Abstract: Paper or cardboard machine and method for regulating a basis weight of a paper or cardboard web in the manufacturing process. The paper or cardboard machine includes at least one headbox that extends across a machine width. The at least one headbox is adapted to provide a machine-wide distribution of a material suspension onto one of a screen and between two screens. The machine also includes at least one material suspension supply coupled to the at least one headbox and adapted to supply a material suspension to the at least one headbox. The at least one material suspension supply has at least one concentration.Type: GrantFiled: August 19, 1998Date of Patent: April 9, 2002Assignee: Voith Sulzer Papiermaschinen GmbHInventors: Wolfgang Ruf, Hans Loser, Klaus Lehleiter