Patents Assigned to Hennecke GmbH
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Publication number: 20140151917Abstract: The invention relates to a method for producing of a form part, especially of a plane thin-walled fiber composite part, in a mould (1), comprising the steps: a) Providing of the mould (1), wherein the mould (1) comprises a cavity (2) with a nominal form volume (V) for inserting of a reactive mixture, wherein the cavity (2) is delimited by at least one cavity wall section (3) which is elastically deformable during the inserting of the reactive mixture and wherein the modulus of compressibility (K) of the cavity (2) is between 2,000 bar and 10,000 bar; b) Inserting of the reactive mixture into the cavity (2), wherein the reactive mixture is inserted with such a pressure into the cavity (2) so that the cavity volume is increased during the insertion of the reactive mixture due to elastic deformation of the at least one cavity wall section (3) above the nominal form volume (V); c) Letting solidify of the reactive mixture in the cavity (2); d) Demoulding of the finished form part from the mould (1).Type: ApplicationFiled: November 27, 2013Publication date: June 5, 2014Applicant: Hennecke GmbHInventors: Juergen WIRTH, Jens GEUER, Michael SCHAMBERG
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Patent number: 8329256Abstract: The invention relates to a process and a device for the production of mouldings containing a layer of polyurethane in shot operation, in which a gas stream is introduced into the flow channel of the spray device in at least two positions.Type: GrantFiled: April 3, 2008Date of Patent: December 11, 2012Assignee: Hennecke GmbHInventors: Wolfgang Pawlik, Dominik Obeloer, Ingo Kleba
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Patent number: 7968023Abstract: The invention relates to a process and a device for the production of polyurethane clock foam, in which the reaction mixture, after flowing through a mixer, flows freely from an outflow opening and then flows through an accumulation chamber, in which a static pressure is built up, a gap and finally an expansion chamber.Type: GrantFiled: October 19, 2007Date of Patent: June 28, 2011Assignee: Hennecke GmbHInventors: Juergen Wirth, Martin Schamberg, Horst Klahre
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Patent number: 7404916Abstract: Cellular or compact polyurethane moldings are produced by conveying at least one isocyanate component and at least one polyol component by a metering machine in dispensing manner into a mixing chamber via component lines to form a polyurethane reaction mixture. Subsequently, the polyurethane reaction mixture is discharged from the mixing chamber into a mold. The pressures of the components are registered by means of pressure transducers in the component lines and are transmitted to a monitoring device. The temporal profiles of the pressures are compared with reference pressure values stored in the monitoring device. A malfunction is signalled in the event of deviation of at least one of the measured pressure profiles from the reference pressure profile beyond a predetermined tolerance threshold.Type: GrantFiled: December 9, 2003Date of Patent: July 29, 2008Assignee: Hennecke GmbHInventors: Michael Begemann, Klaus Sieben, Jürgen Wirth, Wolfgang Pawlik
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Patent number: 7351363Abstract: A press for rigid foam sheets with continuous adjustment of the spacing between the two press plates (1,3), in particular for sandwich panels with an upper and lower outer layer and, located therebetween, a core of rigid polyurethane foam. The lower press plate (3) is here moved into a preselected position corresponding to the panel thickness to be foamed by means of synchronously rotating threaded lifting spindles (4), assisted by weight-compensating cylinders (5). Short-stroke cylinders (6) are provided between the heads of the threaded lifting spindles (4) and the lower press plate (3). Said short-stroke cylinders have the function of dissipating the moulding force which has arisen due to foaming by moving the press plate (3) a very small stroke downwards. It is also possible, instead of the short-stroke cylinders (6), to install an air cushion system, which has a stroke of approx. 1 mm, between the press plate and the heating plate. This stroke is sufficient to dissipate the foaming pressure.Type: GrantFiled: October 11, 2002Date of Patent: April 1, 2008Assignee: Hennecke GmbHInventor: Carsten Ramcke
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Patent number: 7278842Abstract: The present invention relates to a process for the continuous production of polyurethane sandwich elements comprising an upper outer layer and a lower outer layer and a layer of cellular polyurethane lying in between, which is firmly bonded to the outer layers. This invention also relates to an apparatus suitable for the production of polyurethane sandwich elements as described above.Type: GrantFiled: September 16, 2004Date of Patent: October 9, 2007Assignee: Hennecke GmbHInventors: Michael Begemann, Jürgen Wirth, Reiner Raffel
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Patent number: 7240689Abstract: The invention relates to a mixing head and to a method of mixing at least one polyol component and at least one isocyanate component and where appropriate additives, to form a polyurethane reaction mixture.Type: GrantFiled: April 28, 2005Date of Patent: July 10, 2007Assignee: Hennecke GmbHInventors: Jürgen Wirth, Reiner Raffel
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Patent number: 7230037Abstract: The present invention relates to a method for the continuous mixing of at least one polyol component and at least one isocyanate component and optionally additives to form a polyurethane reaction mixture in a stirrer mixer with an axially conveying stirrer.Type: GrantFiled: September 5, 2003Date of Patent: June 12, 2007Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Reiner Raffel, Jürgen Wirth, Wolfgang Pawlik, Florian Thiebes, Lothar Röhrig
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Patent number: 7144534Abstract: The invention relates to a method of producing rebonded foam blocks in a box mould having a base, a plurality of mutually adjacent mould side walls standing thereupon and a plunger movable in the direction of the base, in which at least one of the mould side walls may be swiveled about a substantially horizontal swivel axis mounted on the base between an outwardly directed position and a substantially vertical position, the method involving mixing the foam flakes with a binder, swiveling at least one of the mould side walls outwards such that the cross-sectional area of the box mould increases from the bottom upwards, introducing the foam flakes into the box mould, adjusting the at least one mould side wall so that the cross-sectional area of the box mould is substantially constant over its height, compressing the foam flakes by means of the plunger to the desired density or foam block height, thereby bonding together the foam flakes and removing the finished foam block from the mould.Type: GrantFiled: November 22, 2004Date of Patent: December 5, 2006Assignee: Hennecke GmbHInventors: Bodo Büchel, Jürgen Wirth, Horst Klahre
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Patent number: 7101163Abstract: Slabstock foam free of cavities can be produced without any restriction, i.e. also from rapidly reacting chemical systems, by introducing the liquid reaction mixture from underneath, in front of, and/or through an optionally swivellable floor plate, wherein the floor plate and the inlet for introducing the liquid reaction mixture is arranged in a manner such that the reaction mixture above the floor plate is substantially still liquid.Type: GrantFiled: November 1, 2004Date of Patent: September 5, 2006Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Lothar Röhrig, Reiner Raffel
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Patent number: 6889816Abstract: A device for carrying out a sequence of working steps on travelling work station wagons comprising an oval track wherein said work station wagons are circulating, wherein said wagons comprise at least one detachable connection element connected to a circulating chain which moves said wagons; at least one insertion and at least one removal guide track is provided on the outside of said oval track, wherein said at least one insertion and at least one removal guide track comprises a transfer point to which the chain is allocated; at least one coupling element is further provided at each transfer point via which the wagons may be coupled into the guide tracks on the side opposite of the side of said wagons comprising at least one detachable element, with at least one switchable points element located on said guide track, which during the insertion position, release said at least one coupling element and bring about the engagement of said detachable connection element to said chain or during the removal position,Type: GrantFiled: November 18, 1998Date of Patent: May 10, 2005Assignee: Hennecke GmbHInventor: Bernd Willing
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Patent number: 6833095Abstract: Slabstock foam free of cavities can be produced without any restriction, i.e. also from rapidly reacting chemical systems, by introducing the liquid reaction mixture from underneath, in front of, and/or through an optionally swivellable floor plate, wherein the floor plate and the inlet for introducing the liquid reaction mixture is arranged in a manner such that the reaction mixture above the floor plate is substantially still liquid.Type: GrantFiled: November 5, 2001Date of Patent: December 21, 2004Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Lothar Röhrig, Reiner Raffel
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Patent number: 6808378Abstract: Plastic moldings reinforced with long fibers are made without the risk of forming loops in a continuous thread or roving fed to a cutting unit at the end of a mold filling operation or tearing thereof during renewed start-up for the next molding filling operation, even at a relatively high take-off speed of the continuous thread. This is achieved by keeping the continuous thread permanently under tension pneumatically against the conveying direction. The device useful for carrying out this process is equipped with at least one tensioning air inlet in the guide for the continuous thread or roving.Type: GrantFiled: July 30, 2001Date of Patent: October 26, 2004Assignee: Hennecke GmbHInventors: Jürgen Wirth, Wolfgang Pawlik
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Patent number: 6809124Abstract: The invention relates to a method for the production of polyurethane block foam, wherein a polyurethane reactive mixture containing carbon dioxide is suddenly relieved from a pressure above the pressure breaking the equilibrium of the carbon dioxide to a normal pressure, wherein the liquid polyurethane reactive mixture is foamed by releasing dissolved carbon dioxide.Type: GrantFiled: December 13, 2002Date of Patent: October 26, 2004Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Reiner Raffel, Martin Schamberg
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Patent number: 6689325Abstract: A process is described for producing foam materials from two-component reactive plastics using carbon dioxide as blowing agent by mixing at least one of the reactive components with carbon dioxide under pressure, mixing the components, at least one of which contains carbon dioxide under pressure, expanding the reactive mixture containing carbon dioxide obtained by mixing, and hardening, wherein the expansion takes place suddenly with the production of high rates of shear. Preferably the rate of flow of the reaction mixture is reduced after expansion.Type: GrantFiled: April 23, 1998Date of Patent: February 10, 2004Assignees: Bayer Aktiengesellschaft, Hennecke GmbHInventors: Ferdinand Althausen, Reiner Raffel, Wilfried Ebeling, Robert Eiben
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Patent number: 6635200Abstract: Polyurethane molded articles are produced from a flowable polyol-polyisocyanate reaction mixture on a shot-wise basis. The flowable reaction mixture is formed by combining the components of that mixture in the mixing chamber of a mixhead. The contents of the mixhead are introduced (preferably via an outlet pipe) into a mold in a manner such that the mixing chamber is substantially emptied in each case. Any ambient gas in the mixing chamber is then removed before the respective next shot is initiated.Type: GrantFiled: August 29, 2001Date of Patent: October 21, 2003Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Reiner Raffel, Helmut Duschanek
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Patent number: 6615700Abstract: From an extruded panel manufactured continuously by means of a twin-belt conveyor, shorter sections may be profitably removed by a cutting device equipped with an adjustable program controller which fixes optimum start-of-cut positions related to a reference point and lying immediately in front of the edges of the extruded panel. The cutting blade is brought into the optimum start-of-cut position in good time before each cut.Type: GrantFiled: March 13, 2001Date of Patent: September 9, 2003Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Hans-Walter Schug
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Patent number: 6602971Abstract: Flowable reaction components of a reaction mixture which form solid or foamed material comprising filling material are transported from a storage container to a high-pressure mixing head in pressure stages by the use of gear pumps connected in series without major wear of the gear pumps.Type: GrantFiled: April 20, 2001Date of Patent: August 5, 2003Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Reiner Raffel
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Patent number: 6544481Abstract: Reaction mixtures which form polyurethane foamed material, with production conditions which are varied during production, e.g. variation of the proportion of foaming agent, variation of the ratio of reaction components, variation of the throughput, or fine adjustment, can be produced by employing an improved apparatus which comprises a depressurisation element (creamer) (10), wherein a perforated plate or sieve plate constructed as a first throttle plate (24), and a second perforated or sieve plate, which is constructed as a throttle plate (26, 27, 28) and which is disposed downstream thereof, are disposed in the creamer (10), wherein the spacing a between these two throttle plates (24, 26) can be varied during operation in accordance with the variable production conditions, and wherein a calming element (29) is disposed after the second throttle plate (26) in the direction of flow.Type: GrantFiled: December 29, 1999Date of Patent: April 8, 2003Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Reiner Raffel, Florian Thiebes
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Patent number: 6361723Abstract: A process and device are disclosed for manufacturing foam moldings. The parting plane of the mold has a circumferential vacuum channel, the top mold half has a suction channel for quickly evacuating the mold and self-closing expansion channels are arranged at the highest points of the inner cavity of the mold.Type: GrantFiled: July 8, 1999Date of Patent: March 26, 2002Assignee: Hennecke GmbHInventors: Hans-Michael Sulzbach, Jürgen Wirth