Nonuniform Heating Patents (Class 156/583.4)
  • Patent number: 11548672
    Abstract: The film sealing and wrapping machine with a rotary cut and seal jaw is provided. The rotary cut and seal jaw has an internal sliding mechanism which provides for smooth and quiet operation. The rotational speed of the jaw may be varied to increase through put and to provide for a title bag around products. The rotary cut and seal jaw may comprise a seal bar and pressure pad may both be spring loaded to self align the seal bar and pressure pad during the sealing and cutting process. Lastly, a gap defined by a belt disposed upstream and downstream of the seal bar and pressure pad may be mechanically linked to the pressure pad through a control carriage.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: January 10, 2023
    Assignee: nVenia LLC
    Inventors: Raymond Uttaro, John Robinson, Michel Laurin
  • Patent number: 10781004
    Abstract: A bag making and packaging machine includes a cutter fixed to a sealing member that cuts a laterally sealed portion of a film using pressure force with which a pair of sealing members sandwiches the film during lateral sealing. The bag making and packaging machine further includes a pair of sealing jaws, a knife, a pressurization mechanism, and a pressurization mechanism control part. The knife fixed to one sealing jaw, fusion-cuts the laterally sealed portion of the film. The pressurization mechanism exerts pressure force on one sealing jaw towards the other sealing jaw so that the pair of sealing jaws sandwiches and laterally seals the film therebetween, and the knife comes into contact with a laterally sealed portion and fusion-cuts the laterally sealed portion. The pressurization mechanism control part causes the pressurization mechanism to cease exerting pressure force based on error information pertaining to the film or the goods.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: September 22, 2020
    Assignee: ISHIDA CO., LTD.
    Inventors: Takahiro Yasuda, Makoto Ichikawa
  • Patent number: 10654632
    Abstract: A flexible container incorporating flexible front and rear sheets with a perimeter seal in which at least one length or section of the perimeter seal can include a seal weld that has both a permanent seal section and a pressure absorbing seal section. The pressure absorbing seal section is configured to peel, fail, or split when the flexible container, filled with a solution or liquid, is dropped onto a hard surface to thereby absorb the impact of the drop. The flexible container can be provided with one or more dispensing and/or additive ports or without any port. The flexible container may include more than one compartments with a peelable seal separating two adjoining compartments of the flexible container.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: May 19, 2020
    Assignee: B. Braun Medical Inc.
    Inventor: Robert E. Turner
  • Patent number: 10035319
    Abstract: A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a sealing zone, and a weakening zone disposed within the single sealing zone. The single sealing zone may be a heated perforator, and may include a heating wire. The heating wire may be an NiCr wire stitched into holes in a cap or on the seal bar. Bushings may be disposed in the holes.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: July 31, 2018
    Assignee: CMD Corporation
    Inventors: Arvid R. Johnson, Peter T. Hunnicutt, Christopher L. White, Thomas C. Jansen, Timothy J. Rymer, Paul A. Selle
  • Patent number: 9536911
    Abstract: The present invention discloses an assembling method for array substrate and color filter substrate of liquid crystal display, which comprises: coating a seal on a color filter substrate; forming multiple sealing points at the predetermined position between an array substrate with liquid crystal and the color filter substrate; rotating the color filter substrate to fit the array substrate; irradiating the sealing points using a light source to cure the sealing points, so that the array substrate and the color filter substrate are bonded. According to the embodiment of the present invention, it can be aligned precisely during assembling process of the array substrate and the color filter substrate, which avoids the poor substrate alignment caused by handling or flip and then improves the product yield.
    Type: Grant
    Filed: September 29, 2013
    Date of Patent: January 3, 2017
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Guo Zhao
  • Patent number: 9533780
    Abstract: An apparatus for sealing an open end of a package comprises a first longitudinally extending sealing jaw, bearing mounted on a first eccentric shaft rotatable around a first rotational axis, and a second longitudinally extending sealing jaw, bearing mounted on a second eccentric shaft rotatable around a second rotational axis, the second sealing jaw being parallel with the first sealing jaw. At least one motor drives rotation around the first and second rotational axis in opposite directions, wherein the first and the second sealing jaws oppose each other, and are allowed to oscillate between sealing and open positions by moving towards and away from each other. A first and second transversally extending guiding bar cooperate with the first and second eccentric shaft via guiding pins running in guiding grooves, such that transverse play between the first and the second eccentric shaft and the first and second sealing jaw is allowed.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: January 3, 2017
    Assignee: TETRA LAVAL HOLDINGS & FINANCE S.A.
    Inventor: Richard Persson
  • Patent number: 9149980
    Abstract: A method and apparatus for sealing films. In one embodiment the sealing device comprises a horn and an anvil. The film has a standard portion and an increased portion. Increased energy is applied to the film in the increased portion compared to the energy applied to the standard portion. Such a method allows for sealing of varying number of layers.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: October 6, 2015
    Assignee: FRITO-LAY NORTH AMERICA, INC.
    Inventors: Pak Meng Cham, Glenn T. Jordan, IV, Austin Kozman, Sean Flowers, Matthew Short
  • Patent number: 9132931
    Abstract: A heat-transfer label assembly. In a preferred embodiment, the heat-transfer label assembly includes a support. A plurality of labels are positioned over the support for transfer from the support to an article, each of the labels including an ink design. A plurality of spacers are positioned over the support but not over the label, the spacers not being transferable with the labels from the support to an article. The distance from the top of the spacers to the support exceeds the distance from the top of the labels to the support so that, when the assembly is wound into a roll, the labels do not come into contact with the bottom surface of an underlying portion of the support.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: September 15, 2015
    Assignee: AVERY DENNISON CORPORATION
    Inventors: Kuolih Tsai, Dong-Tsai Hseih, Yi-Hung Chiao, Alan Morgenthau, Roger Recupero, Julio Adalberto De La Cruz Escobar
  • Patent number: 8651162
    Abstract: A tubular heating element which is resistant to damage caused by foreign material is disclosed. The tubular heating element is pivotably attached to the side sealing machine at its leading (upstream) edge. The trailing (downstream) edge of the tubular heating element is moved by means of a compressible force, such as an air cylinder. In this way, the air in the cylinder pushes the tubular heating element downward into the plane of the film. However, a foreign object located on the film can overcome the force of the air cylinder, thereby lifting the tubular heating element out of the path of the film.
    Type: Grant
    Filed: August 1, 2011
    Date of Patent: February 18, 2014
    Assignee: Shanklin Corporation
    Inventors: Russell Christman, Thomas Orsini, Todd Brown, Jeffrey Potts
  • Patent number: 8627869
    Abstract: Stoppers for preventing lifting of the worked sheet are comprised of two stoppers near the press and above the worked sheet at a predetermined space from the worked sheet, one of the stoppers arranged at an upstream side from the press and the other of the stoppers arranged at a downstream side from the press, whereby when the press seals the worked sheet and then moves upward, the preventive stoppers prevent the worked sheet from being lifted up.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: January 14, 2014
    Assignee: Unicharm Corporation
    Inventors: Takayuki Matsumoto, Shigetomo Takahashi, Yuji Yamashita, Hiroaki Goto
  • Patent number: 8603279
    Abstract: The invention relates to a device for welding a stiffener to a skin. The stiffener has a stiffener foot with a bearing surface parallel to the skin surface and a stiffener flange projecting away from the plane of the bearing surface. The device includes a metallic support includes a seating surface matching the shape of the receiving side; a groove which accommodates a flange of the stiffener inserted in the groove; an insulative supporting structure for positioning a bearing surface against the receiving side; and a conformal panel for applying pressure forcing said bearing surface against said receiving side. A heater temporarily raises the temperature of bearing surface of the stiffener and the adjacent receiving side of the skin to above the melting point of the matrix when pressure is applied thereby welding the stiffener to the skin.
    Type: Grant
    Filed: October 2, 2012
    Date of Patent: December 10, 2013
    Assignee: Airbus Operations (SAS)
    Inventors: Pierric Malasse, Florian Chotard
  • Patent number: 8474501
    Abstract: An inflatable or gas-filled insulation panel comprises an envelope having two outer sheets sealed together along edges of the sheets and at least one of the sheets has an outer reflective surface. The envelope encases a plurality of internal films that include a polymeric film having a plurality of reflective stripes disposed thereon and spaced apart on the films. Seals are formed along the gaps or areas between the reflective stripes on the films by application of heat and pressure, which causes the films to seal to each other and the outer sheets at spaced apart intervals. A channel is formed between the outer edges of the films and the outer sheets, and a valve, disposed at an end of the panel, is in fluid communication with the channel for the injection of a fluid, such as an inert gas or air, to inflate panel.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 2, 2013
    Assignee: Fi-Foil Company, Inc.
    Inventors: William A. Lippy, Addric E. Bassham, Douglas F. Kinninger, Craig T. Price, Robert L. Swanson
  • Publication number: 20120279666
    Abstract: A press apparatus for curing adhesive on inner adhesion surfaces of substantially continuous wood products (1) under synchronous compression heating. The apparatus includes at least two presses (2) having a mutual distance from each other fulfilling the precondition: L/(n?1), where L is the working length of each press and n is the number of presses in series.
    Type: Application
    Filed: April 12, 2012
    Publication date: November 8, 2012
    Applicant: RAUTE OYJ
    Inventor: Hannu SINKO
  • Patent number: 8191598
    Abstract: A heat sealing jaw for use in cooperation with an opposing backing jaw for sealing layers of film together is described. The heat sealing jaw may be suitable for forming an easy-open feature on a packaging pouch used to contain flowable material. In certain embodiments the heat sealing jaw comprises a jaw body, a heat sealing element secured to the jaw body, a support surface for clamping the layers of film together against the opposing backing jaw, and, a heat sink coupled to the heat sealing element for inducing a temperature gradient along a sealing face of the heat sealing element. The sealing face may have a protrusion for forming a notch within the layers of film. Related apparatuses and methods are also described.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: June 5, 2012
    Assignee: Liqui-Box Corporation
    Inventors: James William Sadler, Qin Lin, Gordon Charles Bird, Victor Wayne McCarron
  • Patent number: 8128770
    Abstract: The invention is directed to a device for inflating and sealing an inflatable structure, such as inflatable cushions. The device includes an assembly configured for inflating a cushion cavity disposed between first and second layers of a film, and a sealing mechanism that preferably includes a rotary sealing drum, which can include a heat source.
    Type: Grant
    Filed: September 20, 2007
    Date of Patent: March 6, 2012
    Assignee: Pregis Innovative Packaging, Inc.
    Inventors: Thomas D. Wetsch, Paul A. Selle, Mitchell J. Hein
  • Patent number: 8105462
    Abstract: A method for transferring an adhesive film, which contains: conveying the adhesive film to an area between the heating part and the adherend; pressurizing the adhesive film with the heating part from the side of the release layer and heating the adhesive layer up to a first heating temperature so as to bring the adhesive layer into contact with the adherend; bringing a high temperature heating part, which is disposed downstream of the heating part with respect to the conveyance direction of the adhesive film, into contact with the adhesive film from the side of the release layer, and heating the adhesive layer up to a second heating temperature so as to cut the adhesive layer; and releasing the release layer from the adhesive layer which is in contact with the adherend, and transferring the adhesive layer which is in contact with the adherend to the adherend.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: January 31, 2012
    Assignees: Sony Corporation, Sony Chemical & Informational Device Corp.
    Inventor: Misao Konishi
  • Patent number: 8052036
    Abstract: A tab lead soldering apparatus soldering a tab lead to a front face and a rear face of a solar cell has a first pressing mechanism pressing the tab lead toward the front face of the solar cell, a second pressing mechanism pressing the tab lead toward the rear face of the solar cell rear face, a heat member and a support member provided to the first pressing mechanism and/or the second pressing mechanism to contact with the tab lead, a heat member shift mechanism shifting the heat member between a contact position to contact an end of the heat member with the tab lead and a separation position to separate the end of the heat member from the tab lead, and a support member shift mechanism shifting the support member between a contact position to contact an end of the support member with the tab lead and a separation position to separate the end of the support member from the tab lead.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: November 8, 2011
    Assignee: NPC Incorporated
    Inventor: Yoshiro Chikaki
  • Patent number: 7992615
    Abstract: The present invention is related to a shock-absorbing packing material inflated with air and to an apparatus for manufacturing the shock-absorbing packing material. As polystyrene plastic typically used for a shock-absorbing material becomes difficult to use because of environmental pollution, a shock-absorbing means that are formed by compiling plastic films or sheets, bonding them using heat or high frequency waves, and then inflating it by injecting air between the films are often used. However, it was difficult to develop an apparatus for manufacturing these shock-absorbing means with substantially high economical efficiency. Accordingly, the invention provides an apparatus for manufacturing a shock-absorbing material with economical efficiency, and enhanced productivity without looseness or extension, as the plastic sheet or films rolled on a plurality of rolls are bonded by heat at a constant interval while unrolling them.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: August 9, 2011
    Inventor: Young Seok Kim
  • Patent number: 7958922
    Abstract: An apparatus and method for cutting and heat sealing separator materials enveloping individually shaped electrode is described. The electrodes can be cathodes, anodes or other active components for incorporation into batteries, capacitors, and other implantable medical devices.
    Type: Grant
    Filed: December 6, 2007
    Date of Patent: June 14, 2011
    Assignee: Greatbatch Ltd.
    Inventors: Keith W. Seitz, Steven Schmit, Shawn Patterson, Laurie O'Connor
  • Patent number: 7591924
    Abstract: A method and apparatus is disclosed for affixing a cover layer formed of liquid crystal polymer to a flex circuit consisting of circuit elements mounted to a liquid crystal polymer substrate in order to encapsulate the circuit elements between the cover layer and substrate to protect them from exposure to moisture and contaminants and to provide thermal protection of temperature sensitive circuit elements within the flex circuit during the encapsulation process.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: September 22, 2009
    Assignee: Harris Corporation
    Inventors: C. W. Sinjin Smith, Charles M. Newton, Paul B. Jaynes
  • Patent number: 7566374
    Abstract: A method of making a mat with a textile surface and an elastomer backing is provided. The method includes mixing elastomer crumbs and a binder, depositing the crumb/binder mixture in a layer (22), placing a textile surface element (34) on the layer to form a mat assembly, and pressing the mat assembly in a press (9) while setting the binder. The elastomer crumbs are consolidated to form an elastomer backing (2) that includes voids between the elastomer crumbs, and the textile surface element is bonded to the elastomer backing to form the upper textile layer (1) of the mat.
    Type: Grant
    Filed: June 12, 2003
    Date of Patent: July 28, 2009
    Assignee: Milliken & Company
    Inventors: Peter C. Brazier, Thomas A. P. Brock, Robert C. Kerr, Bhawan Patel, Flemming Bojstrup, Patrick Morel
  • Patent number: 7422045
    Abstract: A sealing unit (8) for applying a plastic foil (7) to a planar substrate material (1) by means of heat and pressure using a sealing plate (11) with a heated active surface and a back plate (9) which is movable relative thereto. In accordance with the invention, sealed material from the sealing unit is provided to a die cutting unit (16) and preferably the sealing unit (8) is linked to the die cutting unit (16). The die cutting unit is provided with at least one die cutting knife (15) and a counter plate (21) for subsequently making die cuts (6) at selected locations in the planar substrate material (1) in the region of the applied plastic film (7).
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: September 9, 2008
    Assignee: Tetra Laval Holdings & Finance S.A.
    Inventor: Steffen Polster
  • Publication number: 20040142273
    Abstract: A transfer device in which a material which transmits a laser beam LB is employed as an upper mold, and a photothermal conversion layer is formed thereon. A transfer film, at which a transfer material layer is formed, and a workpiece are superposed and pressured between the upper mold and a lower mold. During this pressuring, the laser beam is irradiated in accordance with a pattern of an organic electroluminescent light-emitting layer that is to be formed on the workpiece. Thus, the photothermal conversion layer is heated and the transfer material layer is softened. As a result, the transfer material layer is cleaved and detached from a temporary support, and a component in the transfer material layer that is to form the organic electroluminescent light-emitting layer is transferred to the workpiece. Accordingly, efficient transfer processing is enabled when a transfer material is transferred to a transfer object by a thermal imaging process.
    Type: Application
    Filed: November 7, 2003
    Publication date: July 22, 2004
    Inventors: Hiroyuki Nishida, Keisuke Endo
  • Publication number: 20040134592
    Abstract: A conduction welding apparatus and method for bonding abutted thermal plastic tubular end portions is particularly suitable for welding PFA. In a preferred embodiment, a folding weld head embraces the abutted the tubular end portions to be welded, each tubular end portion including a flange spaced from the surfaces to be joined. The weld head includes means for securing the flanges within the weld head and further include bias means. The bias means provide an inward axial bias on the adjoined tubular end portions when the tubular end portions are displaced axially outward from the weld head due to the expansion of the plastic during the weld process. The bias means in a preferred embodiment is substantially inoperative prior to the weld and provides bias, or a substantial increase in bias, when the flanges are displaced due to the expansion of the molten PFA during the weld process.
    Type: Application
    Filed: October 6, 2003
    Publication date: July 15, 2004
    Inventors: Michael W. Johnson, Jeffrey J. McKenzie
  • Patent number: 6692614
    Abstract: The present invention relates to a jointing press for jointing a first and second free end of one or more belts which is adapted to raise directly the temperature of the surface of the belt (or belts) thereby decreasing heat-up times and which exploits the unheated platens to act as a heat sink in the cooling step thereby eliminating the need for external water or forced air cooling sources.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: February 17, 2004
    Assignee: Hab Asit Limited
    Inventor: Marshall Wright
  • Patent number: 6675853
    Abstract: An apparatus and method for forming a splice in a conveyor belt. The apparatus includes a lower plate having a heating strip where the splice is being formed. The lower plate includes areas of insulation adjacent the heating strip to reduce transfer of heat to areas of the conveyor belt adjacent the splice during vulcanization or heating.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: January 13, 2004
    Inventor: Curt Shaffer
  • Patent number: 6657165
    Abstract: The invention is a sealing system and a method of operation thereof. A sealing system which forms spaced apart thermal seals along a moving at least one web (60) by contact of the moving the at least one web with heated portions (74) of sealing elements (56) mounted on a sealing wheel (50) during rotation in accordance with the invention includes seal forming elements (56) which peripherally contact the at least one web to form the thermal seals by heat transfer to the at least one web; and wherein each seal forming element has an outer section (62) on which is located at least one electrical heater (78), an inner section (64) which contacts the sealing wheel and an intermediate section (70) which includes thermal insulation (68) which insulates the outer section from the inner section.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: December 2, 2003
    Assignee: R. A. Jones & Co. Inc.
    Inventors: Boris E. Makutonin, Frank G. Oliverio
  • Patent number: 6637491
    Abstract: A sealing head for a lidding machine is disclosed. The sealing head comprises a ball-and-socket joint that allows the head to provide an even, consistent seal when the orientation of the lid and container is not perfectly perpendicular with the sealing head. The sealing head also comprises an insulator portion that rests against the lid during sealing to protect the contents of the container from excessive heat. Heat is applied to the lid through a rim that extends around the circumference of the insulator portion.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: October 28, 2003
    Assignee: Creative Foods, LLC
    Inventors: Samuel M. Massey, Richard Phillips, Jim G. Gardner, Paul D. Balentine
  • Publication number: 20030075278
    Abstract: An apparatus for thermally bonding a cover material onto an absorbent, fibrous web has a substantially cylindrical, rotatable sealing roller and a rotatable anvil roller disposed adjacent the sealing roller to provide a nip therebetween. The cover material and fibrous web can be sealed and calendered in the nip of this apparatus. The sealing roller includes a sealing element and an ironing element, and both of these elements have thermally conductive material and a leading and a trailing end in the direction of rotation.
    Type: Application
    Filed: November 25, 2002
    Publication date: April 24, 2003
    Inventor: Hans-Werner Schoelling
  • Patent number: 6508901
    Abstract: A system and method for cutting and heat sealing polypropylene film and/or other separator material around individually shaped cathode, anode or other active components, for use in a battery or capacitor and/or other implantable medical device.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: January 21, 2003
    Assignee: Wilson Greatbatch Ltd.
    Inventors: Robert D. Miller, Raymond S. Konopa
  • Patent number: 6413334
    Abstract: In a method for the thermal bonding of a base part (3) of a packaging with a cover film (F), especially for the welding or sealing of a base part of a packaging for contact lenses with a cover film, the contact surface of the base part (3) facing the cover film (F) and the corresponding contact surface of the cover film (F) facing the base part are mechanically pressed against one another along a join. While the mechanical pressure is being generated along the join, heat is simultaneously caused to act on the join, so that the contact surfaces of base part (3) and cover film (F) are thermally bonded to one another along the join. For the purpose of generating the mechanical pressure and causing heat to act on the join there is used a contact plate (70) of low heat capacity which, during the thermal bonding, is pressed against the surface of the cover film (F) remote from the contact surface.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: July 2, 2002
    Assignee: Novartis AG
    Inventors: Peter Rittner, Peter Zang, Dieter Koch, Bernd Bochmann, Kurt Heinzelmann, Karl Kappler, Heiner Hornberger, Heinz Schlumpberger
  • Patent number: 6390168
    Abstract: The invention provides for improved welding of thermoplastic sheets by selectively reducing and optimizing the temperature gradient from the edge of the weld to the unheated body of the sheet by adding heating-surface-area, beyond that required to achieve a weld, to a heating tool for the purpose of raising the temperature of the material adjacent to and along the edge of the weld, in a controlled manner.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: May 21, 2002
    Inventor: Friedrich Struve
  • Patent number: 6378589
    Abstract: The invention provides for improved welding of thermoplastic sheets by selectively controlling the amount of heat transferred from an improved heated tool to various areas of the weld, by modifying the heat transfer efficiency of selected areas of the tool's heating surfaces.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: April 30, 2002
    Inventor: Friedrich Struve
  • Publication number: 20020043344
    Abstract: Method and apparatus for registering and bonding upper and lower substrate plates together through a sealer material and in such a way as to form a gap of a predetermined width between the two substrate plates. Registered substrate plates are provisionally pressed to form a joined substrate assembly, which is then pressed under heated conditions at a hot press station, thereby compressing the sealer material into a flattened form and at the same time thermally hardening the sealer material to form a predetermined gap space between the two substrate plates. In order to correct positional deviations which occur to the upper and lower substrate plates in the course of the hot pressing, on the basis detected positional deviations of upper and lower substrate plates of a hot-pressed substrate assembly, upper and lower substrates are set in offset positions instead of aligned positions when registering them at the provisional press station to cancel predicted positional deviations at the hot press station.
    Type: Application
    Filed: September 14, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi Electronics Engineering Co., Ltd.
    Inventors: Hiroyuki Watanabe, Yuji Otsubo, Shinji Sugizaki, Hisayoshi Ichikawa, Hiroaki Kiyomiya
  • Patent number: 6344258
    Abstract: Apparatus for heat-sealing polymer films which shrink when heated include provision for moving the zone of application of heat and pressure during the heat sealing process. This allows for shrinking of the polymer film in a region adjacent to the heat seal so that the film thickens and is more resistant to failure in use through peeling. The apparatus includes a pair of sealing bars (4, 5) one of which (4) is wedge-shaped and the other of which (5) is flat. Both bars are heated and one of them can be moved in direction (12) to apply pressure to film located between the bars. At the beginning of the heat sealing step pressure is applied over an initial zone along the apex of the wedge. Subsequently the bare (4) is rolled around an axis located near to the apex of the wedge, in the direction shown by the right hand end of arrow (13), to apply heat and pressure over a wider zone located adjacent to the initial zone.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: February 5, 2002
    Inventor: Ole-Bendt Rasmussen
  • Patent number: 6342115
    Abstract: A laminating heating module for use in a flatbed laminating machine. The heating module comprises an elongate body portion with at least one heating pad attached thereto. The heating pad is fabricated from silicone rubber and includes three separate heating zones for regulating the heat to the body portion. Attached to each heating zone of the heating pad is a respective thermocouple to control the temperature of each heating zone. The heating module further comprises a thermostat attached to the heating pad and operative to protect the temperature of the body portion of the heating module from overheating.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: January 29, 2002
    Inventors: Nasser Pourmand, John James Boyer
  • Patent number: 6289961
    Abstract: An apparatus for longitudinally welding and severing superposed thermoplastic films forming a packaging hose includes first and second feed rollers each having an outer periphery contacting one another for advancing the films passing therebetween; a drive for rotating at least one of the feed rollers; a circular heating disk mounted in the first feed roller coaxially therewith and having an outer diameter greater than the peripheral diameter of the first feed roller; and a circumferential groove provided in the second feed roller in alignment with the heating disk. Peripheral portions of the heating disk project into the circumferential groove of the second feed roller.
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: September 18, 2001
    Assignee: SIG Pack Systems AG
    Inventors: Günther Bausch, Alfred Wipf