EP0176883B1 - Rubbing surface packing of a double belt press - Google Patents

Rubbing surface packing of a double belt press Download PDF

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Publication number
EP0176883B1
EP0176883B1 EP85111898A EP85111898A EP0176883B1 EP 0176883 B1 EP0176883 B1 EP 0176883B1 EP 85111898 A EP85111898 A EP 85111898A EP 85111898 A EP85111898 A EP 85111898A EP 0176883 B1 EP0176883 B1 EP 0176883B1
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EP
European Patent Office
Prior art keywords
groove
pressure
retaining strip
support brackets
double belt
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP85111898A
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German (de)
French (fr)
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EP0176883A1 (en
EP0176883B2 (en
Inventor
Kurt Held
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • B30B5/062—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band urged by directly-acting fluid pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
    • Y10T156/1702—For plural parts or plural areas of single part
    • Y10T156/1712—Indefinite or running length work
    • Y10T156/1741—Progressive continuous bonding press [e.g., roll couples]

Definitions

  • the invention relates to a double belt press for applying surface pressure to continuously advancing sheet-like materials with a rigid press frame, with bearing bridges.
  • the press frame rotatably mounted deflection drums, with an upper and a lower, endless press belt guided over the deflection drums and with pressure chambers which can be pressurized with fluid pressure media to generate the pressing pressure on the press belt runs up and down from the pressure plates and the inside of the press belt runs the sides are delimited by a sliding surface seal located in a retaining strip, this retaining strip is arranged displaceably in the circumferential grooves on the edge of the pressure plates perpendicular to the press belt, on the retaining strip there is an O-ring cord, the base of the groove and the atmospheric and pressure side Groove walls of the groove touching groove seal is located, a fluid pressure medium acts on the groove seal from the groove base of the groove, whereby the sliding surface seal is pressed with a force against the inside of the press belt run and the holding strip with lateral, firmly attached to the holding strip support bracket
  • Double belt presses are used for the continuous pressing of leading sheet-like materials such as chipboard, impregnated paper, decorative laminates, impregnated glass and natural fibers, fabrics, plastic or rubber sheets.
  • a liquid or gaseous pressure medium is introduced into a pressure chamber delimited by sliding surface seals and a pressure plate on the respective rear side of the press belts, and this pressure medium compresses the material web lying between the two belts.
  • DE-A-2 722197 shows a sliding surface seal for a double belt press which forms a generic type for the invention.
  • this double belt press there is a circumferential groove in the pressure plates, in which the sliding surface seal for sealing the pressure chambers, which are formed by the pressure plates, the back of the press belts and the sliding surface seal, is used.
  • the seal of this sliding surface seal is contained in a U-shaped metal retaining strip.
  • Rigid, non-elastic support brackets are attached to the legs of the retaining strip. These support brackets are supported on transverse bearings in the pressure plate and thus transmit the longitudinal thrust exerted on the sliding surface seal due to the movement of the press belt into the pressure plate.
  • the object of the invention is to improve the free, vertical movement of the holding strip relative to the printing plate plane in order to adapt to different workpiece thicknesses.
  • the double belt press shown schematically in FIG. 1 for the continuous production of laminates has four deflection drums 1, 2, 3, 4 rotatably mounted in bearing bridges 5, 6.
  • the press belts 7, 8 are tensioned using known means, for example hydraulic cylinders. The direction of rotation is indicated by arrows in the deflection drum 1 and 4.
  • a material web 9 which runs from right to left in the drawing and which can consist of laminates, fiber-binder mixtures or the like impregnated with synthetic resin is compressed with simultaneous application of heat and pressure. If the material to be pressed requires appropriate treatment, compaction can also take place without exposure to heat or with cooling.
  • the pressure exerted on the material web 9 is applied hydraulically to the inside of the press belt runs 7, 8 via pressure plates 11, 12 and transferred from village to the material web 9.
  • the reaction forces exerted by the material to be pressed are transferred via the pressure chambers 11, 12 and from support beams 13, 14 connected to them into the press frame, which is only indicated schematically.
  • the inlet-side deflection drums 1, 4 are heated and thereby heat the belt runs 7 and 8.
  • the amount of heat absorbed by these is transported by their heat capacity into the reaction zone 10 and released there to the material web 9, where it serves to harden the pressed material.
  • the material to be pressed can also be heated by other means, for example by the heated pressure medium itself.
  • a pressurizable fluid pressure medium is brought into the space between the pressure plate 11, 12 and the inside of the press belt run 7, 8.
  • This space, the so-called pressure chamber, is bounded on the sides with seals.
  • a synthetic oil is used as the pressure medium, which withstands the operating conditions prevailing in the double belt press.
  • a gas for example compressed air, can also be used just as well.
  • Such a pressure chamber is shown in plan view in FIG. 2 seen from the back of the press belt.
  • the pressure plate 11 consists of a steel plate and has a rectangular shape. In the edge area around its circumference there is a groove in which the seal 18 is located to limit the sides.
  • one or more inlets 20 are provided in the pressure plate 11, through which the pressure medium is introduced into the pressure chamber 19.
  • the pressure plate 11 can be provided with transverse or longitudinal bores through which heated thermal oil circulates.
  • Fig. 3 the edge region of the pressure chamber 19 is shown in section according to the enlarged partial section A with the sealing arrangement delimiting it.
  • a groove 15 is introduced, in which the seal 18 is housed.
  • This seal 18 has a substantially rectangular cross section and is made of an elastomeric material.
  • the seal 18 is permanently installed in a groove in a U-shaped retaining strip 21 against longitudinal displacement.
  • the width of the retaining strip 21 is only slightly smaller than the inside width of the groove 15, so that a small distance 24 or 25 remains between the groove walls 22 and 23, which is preferably in the range below 1/10 mm.
  • a groove seal 26 made of elastic material and designed as an O-ring.
  • This O-ring 26 contacts the groove walls 22 and 23 on both sides.
  • Above the groove 15 there is a bore 27 which is in communication with the pressure chamber 19, so that the pressure medium reaches the groove 15 from the pressure chamber 19 and there the O-ring 26 pressurized.
  • the O-ring 26 thus seals the bore 27 from the atmospheric side 28.
  • This O-ring 26 acts on the retaining bar 21, which is freely movable in the vertical direction, since it has a slight play with the walls 22, 23 of the groove. As a result, the seal 18 seated in the holding strip 21 is pressed against the press belt 7.
  • the holding strip 21 and with it the seal 18 follows the deviating movement of the press belt 7 without tilting in the groove 15 and the seal is always on the press belt 7, whereby the pressure chamber 19 is securely sealed against the atmospheric side 28.
  • the holding strip 21 is supported laterally by supporting angles 29 which follow at appropriate intervals and which protrude as far as the holding strip 21 into the region of the groove 15.
  • the support brackets 29 are fixed and rigidly connected to the holding strip 21 at the point of contact, in the present exemplary embodiment by a welding seam 30 which is attached with the aid of a YAG laser welding device.
  • this fixed connection can also be made by brazing, gluing or screwing.
  • Each support bracket which is designed as a leaf spring-like sheet metal plate that can be deflected in the direction perpendicular to the plane of the pressure plate 11, is at the end facing away from the point of contact between the support bracket 29 and the retaining strip 21 within a guide groove 31, which is in the pressure plate 11 perpendicular to the groove 15 of its pressure chamber wall 23 vented, screwed to the pressure plate 11.
  • a screw bolt 32 is used for this fastening.
  • This relative movement between the belt run and the seal creates a frictional force that is proportional to the contact pressure and the sliding friction coefficient is.
  • This frictional force, which acts as a pushing or pulling force on the seal 18, must be conducted completely into the pressure plate 11 without the seal being deformed inadmissibly, since otherwise it could no longer fulfill its sealing function.
  • a further embodiment of a sliding surface seal according to the invention is shown in plan view from the back of the press belt as shown in FIG. 4 and a section along the line AA in FIG. 5.
  • the seal 18 consisting of elastomeric material is in a U-shaped retaining strip 33 firmly inserted.
  • This retaining strip is in turn seated vertically displaceably in a groove 15 of the pressure plate 11 with only slight play.
  • a groove seal 26 consisting of an O-ring is also attached above the retaining strip and touches the groove and pressure-side groove walls 22 and 23 and can be acted upon by a bore 27 with pressure medium.
  • Grooves 34 are now introduced into the holding strip 33 in expediently successive sections.
  • support brackets 35 are suspended in such a way that they are covered by the groove seal 26 and are thus pressed firmly onto the holding strip 33.
  • the support bracket 35 has an L-shaped shape at the point at which it is hooked into the groove 34, so that a firm and rigid connection with the retaining strip 33 is produced. From the point where the support bracket 35 leaves the retaining strip 33, it runs obliquely in a guide groove 36 in the pressure plate 11 until it meets the longitudinal guide groove 31, where it then bends again and runs parallel to the pressure plate 11. At this last piece parallel to the pressure plate, it is in turn screwed to the pressure plate by means of a screw bolt 32. For better strength, the support bracket 35 is made from one piece.
  • the support bracket 35 Since the support bracket 35 is pressed firmly and rigidly onto the holding bar 33, it can absorb the thrust and tensile forces in the holding bar 33, which arise due to the frictional forces in the seal 18, and transmit them to the pressure plate.
  • the support bracket 35 can be fastened in the pressure plate 11 by means of a second screw bolt 37, as can be seen in FIG. 4. Another possibility is, as also illustrated in FIG. 4, to make the guide groove 36 in the pressure plate 11 only so large that the support bracket 35 has only a slight lateral play or is fitted exactly laterally.
  • a second screw bolt can of course also be attached in the support bracket 29 to prevent rotation.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Paper (AREA)
  • Package Closures (AREA)

Description

Die Erfindung betrifft eine Doppelbandpresse zum Aufbringen flächigen Drucks auf kontinuierlich vorlaufende bahnförmige Werkstoffe mit einem starren Pressengestell, mit an Lagerbrücken . des Pressengestells drehbar gelagerten Umlenktrommeln, mit einem oberen und einem unteren, über die Umlenktrommeln geführten, endlosen Preßband und mit zur Erzeugung des Preßdrucks auf die Preßbandtrums mit fluiden Druckmitteln beaufschlagbaren Druckkammern, die nach oben und unten von den Druckplatten und den Innenseiten der Preßbandtrums, nach den Seiten durch eine in einer Halteleiste befindliche Gleitflächendichtung begrenzt sind, diese Halteleiste in am Rand der Druckplatten umlaufenden Nuten senkrecht zum Preßband verschieblich angeordnet ist, an der Halteleiste sich eine aus einer O-Ringschnur bestehende, dem Nutgrund zu liegende und die atmosphären- und druckseitigen Nutwände der Nut berührende Nutdichtung befindet, vom Nutgrund der Nut ein fluides Druckmittel auf die Nutdichtung einwirkt, wodurch die Gleitfiächendichtung mit einer Kraft gegen die Innenseite der Preßbandtrums gedrückt wird und die Halteleiste mit seitlichen, fest an der Halteleiste angebrachten Stützwinkeln zur Aufnahme von Zugkräften aus der Halteleiste und deren Einleitung in die Druckplatten versehen ist.The invention relates to a double belt press for applying surface pressure to continuously advancing sheet-like materials with a rigid press frame, with bearing bridges. of the press frame rotatably mounted deflection drums, with an upper and a lower, endless press belt guided over the deflection drums and with pressure chambers which can be pressurized with fluid pressure media to generate the pressing pressure on the press belt runs up and down from the pressure plates and the inside of the press belt runs the sides are delimited by a sliding surface seal located in a retaining strip, this retaining strip is arranged displaceably in the circumferential grooves on the edge of the pressure plates perpendicular to the press belt, on the retaining strip there is an O-ring cord, the base of the groove and the atmospheric and pressure side Groove walls of the groove touching groove seal is located, a fluid pressure medium acts on the groove seal from the groove base of the groove, whereby the sliding surface seal is pressed with a force against the inside of the press belt run and the holding strip with lateral, firmly attached to the holding strip support brackets Absorption of tensile forces from the retaining bar and their introduction into the pressure plates is provided.

Doppelbandpressen dienen zum kontinuierlichen Verpressen von vorlaufenden bahnförmigen Werkstoffen wie Spanplatten, imprägnierten Papieren, dekorativen Laminaten, imprägnierten Glas- und Naturfasern, Geweben, Kunststoff oder Gummibahnen. Bei den sogenannten isobaren Maschinen dieser Gattung wird ein flüssiges oder gasförmiges Druckmittel in eine von Gleitflächendichtungen und einer Druckplatte begrenzte Druckkammer auf der jeweiligen Rückseite der Preßbänder eingeleitet und durch dieses Druckmittel, die zwischen den beiden Bändern liegende Werkstoffbahn verdichtet.Double belt presses are used for the continuous pressing of leading sheet-like materials such as chipboard, impregnated paper, decorative laminates, impregnated glass and natural fibers, fabrics, plastic or rubber sheets. In the so-called isobaric machines of this type, a liquid or gaseous pressure medium is introduced into a pressure chamber delimited by sliding surface seals and a pressure plate on the respective rear side of the press belts, and this pressure medium compresses the material web lying between the two belts.

Bekannt ist die Ausbildung solcher Gleitflächendichtungen nach DE-AS 27 22197, DE-OS 29 07 086, DE-OS2937971 und DE-OS 29 53 078. Allen diesen Dichtungskonstruktionen liegt die Aufgabe zugrunde, die aus der Gleitreibung zwischen Dichtung und Preßbandrückseite resultierenden Kräfte vor allem auf den zur Bandlaufrichtung parallelen Teilen der Gleitflächendichtung in die Druckplatte und damit in das Pressengestell einzuleiten, wobei die Dichtung selbst mit geringstmöglichem Querschnitt und damit höchstmöglicher Flexibilität zur Aufnahme der Reibkräfte befähigt sein soll.It is known to design such sliding surface seals according to DE-AS 27 22197, DE-OS 29 07 086, DE-OS2937971 and DE-OS 29 53 078. All these sealing constructions are based on the task of the forces resulting from the sliding friction between the seal and the back of the press belt all on the parts of the sliding surface seal parallel to the tape running direction to be introduced into the pressure plate and thus into the press frame, the seal itself being capable of absorbing the frictional forces with the smallest possible cross section and thus the greatest possible flexibility.

Eine für die Erfindung gattungsbildende Gleitflächendichtung an einer Doppelbandpresse wird in der DE-A-2 722197 gezeigt. Bei dieser Doppelbandpresse befindet sich in den Druckplatten eine entlang des Randes ringsumlaufende Nut, in der die Gleitflächendichtung zur Abdichtung der Druckkammern, die von den Druckplatten, den Rückseiten der Preßbänder und der Gleitflächendichtung gebildet werden, eingesetzt ist. Die Dichtung dieser Gleitflächendichtung ist in einer U-förmigen metallischen Halteleiste gefaßt. An den Schenkeln der Halteleiste sind starre, unelastische Stützwinkel angebracht. Diese Stützwinkel stützen sich an Querlagern in der Druckplatte ab und übertragen somit den auf Grund der Bewegung des Preßbandes auf die Gleitflächendichtung ausgeübten Längsschub in die Druckplatte.DE-A-2 722197 shows a sliding surface seal for a double belt press which forms a generic type for the invention. In this double belt press there is a circumferential groove in the pressure plates, in which the sliding surface seal for sealing the pressure chambers, which are formed by the pressure plates, the back of the press belts and the sliding surface seal, is used. The seal of this sliding surface seal is contained in a U-shaped metal retaining strip. Rigid, non-elastic support brackets are attached to the legs of the retaining strip. These support brackets are supported on transverse bearings in the pressure plate and thus transmit the longitudinal thrust exerted on the sliding surface seal due to the movement of the press belt into the pressure plate.

Ausgehend von der dem Stand der Technik bildenden DE-A-2 722197 liegt der Erfindung die Aufgabe zugrunde, die freie, gegenüber der Druckplattenebene vertikale Bewegbarkeit der Halteleiste zur Anpassung an unterschiedliche Werkstückdicken zu verbessern.Starting from DE-A-2 722197, which forms the prior art, the object of the invention is to improve the free, vertical movement of the holding strip relative to the printing plate plane in order to adapt to different workpiece thicknesses.

Die Lösung dieser Aufgabe wird durch die im Kennzeichen des Patentanspruchs 1 beschriebene technische Lehre vermittelt.This object is achieved by the technical teaching described in the characterizing part of patent claim 1.

Bei Bewegungen der Halteleiste in vertikaler Richtung, das heißt senkrecht zur Preßbandebene, tritt fast keine Reibung auf, so daß die Gleitflächendichtung sich unterschiedlichen Werkstückdicken unverzüglich anpassen kann.When the holding strip moves in the vertical direction, that is, perpendicular to the plane of the press belt, almost no friction occurs, so that the sliding surface seal can adapt to different workpiece thicknesses immediately.

Einige bevorzugte Ausführungsformen der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen

  • Fig. 1 schematisch eine Doppelbandpresse in Seitenansicht,
  • Fig. 2 eine Druckkammer von der Preßbandrückseite aus gesehen,
  • Fig. 3 einen Schnitt durch die Druckplatte im Randbereich mit der Gleitflächendichtung,
  • Fig. 4 die Draufsicht von der Preßbandrückseite aus gesehen auf eine weitere Ausbildung einer erfindungsgemäßen Gleitflächendichtung,
  • Fig. 5 einen Schnitt entlang der Linie A-A von Fig. 4.
Some preferred embodiments of the invention are shown in the drawings and are described in more detail below. Show it
  • 1 schematically shows a double belt press in side view,
  • 2 seen a pressure chamber from the back of the press belt,
  • 3 shows a section through the pressure plate in the edge area with the sliding surface seal,
  • 4 shows the top view from the back of the press belt on a further embodiment of a sliding surface seal according to the invention,
  • 5 shows a section along the line AA of FIG. 4th

Die in Fig. 1 schematisch dargestellte Doppelbandpresse zur kontinuierlichen Herstellung von Laminaten besitzt vier in Lagerbrücken 5, 6 drehbar gelagerte Umlenktrommeln 1, 2, 3, 4. Um jeweils zwei dieser Trommeln ist ein Pressband 7, 8 herumgeführt, das gewöhnlicherweise aus einem hochzugfesten Stahlband besteht. Die Pressbänder 7, 8 werden mit bekannten Mitteln, beispielsweise Hydraulikzylindern gespannt. Die Umlaufrichtung ist durch Pfeile in den Umlenktrommein 1 und 4 angegeben. Zwischen diesen Pressbändern 7, 8 wird in der Reaktionszone 10 eine in der Zeichnung von rechts nach links vorlaufende Werkstoffbahn 9, die aus mit Kunstharz getränkten Schichtstoffen, Faser-Bindemittelgemischen oder dergleichen bestehen kann, unter gleichzeitiger Anwendung von Wärme und Druck verdichtet. Sollte das Pressgut eine entsprechende Behandlung erfordern, so kann die Verdichtung auch ohne Wärmeeinwirkung oder unter Kühlung erfolgen.The double belt press shown schematically in FIG. 1 for the continuous production of laminates has four deflection drums 1, 2, 3, 4 rotatably mounted in bearing bridges 5, 6. A pressing belt 7, 8, which is usually made of a high-tensile steel band, is guided around two of these drums consists. The press belts 7, 8 are tensioned using known means, for example hydraulic cylinders. The direction of rotation is indicated by arrows in the deflection drum 1 and 4. Between these press belts 7, 8 in the reaction zone 10, a material web 9 which runs from right to left in the drawing and which can consist of laminates, fiber-binder mixtures or the like impregnated with synthetic resin is compressed with simultaneous application of heat and pressure. If the material to be pressed requires appropriate treatment, compaction can also take place without exposure to heat or with cooling.

Der auf die Werkstoffbahn 9 ausgeübte Druck wird über Druckplatten 11, 12 hydraulisch auf die Innenseite der Pressbandtrums 7, 8 aufgebracht und von dorf auf die Werkstoffbahn 9 übertragen. Die vom Pressgut ausgeübten Reaktionskräfte werden über die Druckkammern 11, 12 und von mit diesen verbundenen Stützträgern 13, 14 in das nur schematisch angedeutete Pressengestell übertragen.The pressure exerted on the material web 9 is applied hydraulically to the inside of the press belt runs 7, 8 via pressure plates 11, 12 and transferred from village to the material web 9. The reaction forces exerted by the material to be pressed are transferred via the pressure chambers 11, 12 and from support beams 13, 14 connected to them into the press frame, which is only indicated schematically.

Die einlaufseitigen Umlenktrommein 1, 4 sind beheizt und erwärmen dadurch die Bandtrums 7 und 8. Die von diesen aufgenommene Wärmemenge wird durch deren Wärmekapazität in die Reaktionszone 10 transportiert und dort an die Werkstoffbahn 9 abgegeben, wo sie zum Aushärten des Pressgutes dient. Selbstverständlich kann die Erwärmung des Pressgutes auch mit anderen Mitteln, beispielsweise durch das erwärmte Druckmittel selbst erfolgen.The inlet-side deflection drums 1, 4 are heated and thereby heat the belt runs 7 and 8. The amount of heat absorbed by these is transported by their heat capacity into the reaction zone 10 and released there to the material web 9, where it serves to harden the pressed material. Of course, the material to be pressed can also be heated by other means, for example by the heated pressure medium itself.

Zur Erzeugung des auf die Werkstoffbahn 9 wirkenden Flächendrucks wird ein unter Druck setzbares fluides Druckmedium in den Raum zwischen der Druckplatte 11,12 und der Innenseite des Pressbandtrums 7, 8 gebracht. Zu den Seiten ist dieser Raum, die sogenannte Druckkammer, mit Dichtungen begrenzt. Als Druckmedium wird ein synthetisches Öl verwendet, das den in der Doppelbandpresse herrschenden Betriebsbedingungen standhält. Genausogut kann aber auch ein Gas, beispielsweise Druckluft verwendet werden.To generate the surface pressure acting on the material web 9, a pressurizable fluid pressure medium is brought into the space between the pressure plate 11, 12 and the inside of the press belt run 7, 8. This space, the so-called pressure chamber, is bounded on the sides with seals. A synthetic oil is used as the pressure medium, which withstands the operating conditions prevailing in the double belt press. However, a gas, for example compressed air, can also be used just as well.

In Fig. 2 wird eine solche Druckkammer von der Pressbandrückseite aus gesehen in Draufsicht gezeigt. Die Druckplatte 11 besteht aus einer Stahlplatte und besitzt eine rechteckige Gestalt. Im Randbereich rings um ihren Umfang entlang ist eine Nut eingelassen, in der sich die Dichtung 18 zur Begrenzung nach den Seiten befindet. In der Druckplatte 11 sind je nach Grösse ein oder mehrere Einlässe 20 vorgesehen, durch die das Druckmedium in die Druckkammer 19 eingebracht wird. Zur Beheizung kann die Druckplatte 11 mit Quer- oder Längsbohrungen versehen sein, durch die erwärmtes Thermoöl zirkuliert.Such a pressure chamber is shown in plan view in FIG. 2 seen from the back of the press belt. The pressure plate 11 consists of a steel plate and has a rectangular shape. In the edge area around its circumference there is a groove in which the seal 18 is located to limit the sides. Depending on the size, one or more inlets 20 are provided in the pressure plate 11, through which the pressure medium is introduced into the pressure chamber 19. For heating, the pressure plate 11 can be provided with transverse or longitudinal bores through which heated thermal oil circulates.

In Fig. 3 ist der Randbereich der Druckkammer 19 gemäss vergrössertem Teilausschnitt A mit der sie begrenzenden Dichtungsanordnung im Schnitt dargestellt. Am Rand der Druckplatte 11 ist eine Nut 15 eingrebracht, in der die Dichtung 18 untergebracht ist. Diese Dichtung 18 besitzt einen im wesentlichen rechteckigen Querschnitt und besteht aus einem elastomeren Material. Die Dichtung 18 ist in einer in einer U-förmigen Halteleiste 21 vorhandenen Nut gegen Längsverschiebung fest eingebaut. Die Breite der Halteleiste 21 ist nur geringfügig geringer als die lichte Weite der Nut 15, so dass zwischen den Nutwänden 22 und 23 ein kleiner Abstand 24 bzw. 25 freibleibt, der vorzugsweise im Bereich unter 1/10 mm liegt.In Fig. 3, the edge region of the pressure chamber 19 is shown in section according to the enlarged partial section A with the sealing arrangement delimiting it. At the edge of the pressure plate 11, a groove 15 is introduced, in which the seal 18 is housed. This seal 18 has a substantially rectangular cross section and is made of an elastomeric material. The seal 18 is permanently installed in a groove in a U-shaped retaining strip 21 against longitudinal displacement. The width of the retaining strip 21 is only slightly smaller than the inside width of the groove 15, so that a small distance 24 or 25 remains between the groove walls 22 and 23, which is preferably in the range below 1/10 mm.

Auf der Halteleiste 21 an der dem Pressband abgewandten Seite, dem Nutgrund zu, liegt eine als O-Ring ausgebildete Nutdichtung 26 aus elastischem Material auf. Dieser O-Ring 26 berührt auf beiden Seiten die Nutwände 22 und 23. Über der Nut 15 befindet sich eine Bohrung 27, die mit der Druckkammer 19 in Verbindung steht, so dass das Druckmedium von der Druckkammer 19 in die Nut 15 gelangt und dort den O-Ring 26 unter Druck setzt. Der O-Ring 26 dichtet damit die Bohrung 27 gegenüber der Atmosphärenseite 28 ab. Dieser O-Ring 26 wirkt auf die Halteleiste 21, die in vertikaler Richtung frei beweglich ist, da sie ein knappes Spiel zu den Wänden 22, 23 der Nut besitzt. Dadurch wird die in der Halteleiste 21 sitzende Dichtung 18 gegen das Pressband 7 gedrückt. Weicht das Pressband aus der vorgesehenen Ebene durch unterschiedliche Reaktionskräfte ab, was beispielsweise durch unterschiedliche Dichte oder Dicke der Materialien in der Werkstoffbahn 9 hervorgerufen werden kann, so folgt die Halteleiste 21 und mit ihr die Dichtung 18 der Abweichbewegung des Pressbandes 7 ohne Verkantung in der Nut 15 und die Dichtung liegt immer am Pressband 7 an, womit die Druckkammer 19 gegen die Atmosphärenseite 28 sicher abgedichtet wird.On the retaining strip 21 on the side facing away from the press belt, towards the bottom of the groove, there is a groove seal 26 made of elastic material and designed as an O-ring. This O-ring 26 contacts the groove walls 22 and 23 on both sides. Above the groove 15 there is a bore 27 which is in communication with the pressure chamber 19, so that the pressure medium reaches the groove 15 from the pressure chamber 19 and there the O-ring 26 pressurized. The O-ring 26 thus seals the bore 27 from the atmospheric side 28. This O-ring 26 acts on the retaining bar 21, which is freely movable in the vertical direction, since it has a slight play with the walls 22, 23 of the groove. As a result, the seal 18 seated in the holding strip 21 is pressed against the press belt 7. If the press belt deviates from the intended level by different reaction forces, which can be caused, for example, by different densities or thicknesses of the materials in the material web 9, then the holding strip 21 and with it the seal 18 follows the deviating movement of the press belt 7 without tilting in the groove 15 and the seal is always on the press belt 7, whereby the pressure chamber 19 is securely sealed against the atmospheric side 28.

Durch das knappe Spiel der Halteleiste 21 zu den Wänden 22, 23 der Nut 15 besteht zwischen der atmosphärenseitigen Nutwand 22 und der Halteleiste 21 praktisch kein Spalt, in den die aus einem gummielastischen Dichtungsmaterial bestehende Nutdichtung 26 durch Extrusion eindringen könnte. Wird die Halteleiste 21 durch den in der Druckkammer 19 herrschenden Überdruck an die atmosphärenseitige Nutwand 22 angelegt, so kann es daher zu keinem Verquetschen und Abreissen des Dichtungsmaterials kommen. Somit ist die Nutdichtung 26 wirkungsvoll gegen Zerstörung geschützt und ein Verlust der Dichtfunktion tritt bei Betrieb der Doppelbandpresse hier nicht auf.Due to the tight play of the retaining strip 21 to the walls 22, 23 of the groove 15, there is practically no gap between the atmosphere-side groove wall 22 and the retaining strip 21, into which the groove seal 26 consisting of a rubber-elastic sealing material could penetrate by extrusion. If the retaining strip 21 is applied to the atmosphere-side groove wall 22 due to the excess pressure prevailing in the pressure chamber 19, the sealing material can therefore not be crushed and torn off. Thus, the groove seal 26 is effectively protected against destruction and there is no loss of the sealing function during operation of the double belt press.

An ihrem dem Pressband 7 zugewandten Ende is die Halteleiste 21 seitlich von in zweckmässigen Abständen folgenden Stützwinkeln 29 abgestützt, die bis zur Halteleiste 21 in den Bereich der Nut 15 hineinragen. Die Stützwinkel 29 sind am Berührpunkt mit der Halteleiste 21 fest und starr mit dieser verbunden, im vorliegenden Ausführungsbeispiel durch eine Schweissnaht 30, die mit Hilfe eines YAG-Laser-Schweissgerätes angebracht wird. Selbstverständlich kann diese feste Verbindung auch durch Hartlöten, Klebung oder Verschraubung erfolgen. Jeder Stützwinkel, der als blattfederartige, in Richtung senkrecht zur Ebene der Druckplatte 11 auslenkbare Blechlasche ausgebildet ist, ist an dem dem Berührungspunkt zwischen Stützwinkel 29 und Halteleiste 21 abgewandten Ende innerhalb einer Führungsnut 31, die in der Druckplatte 11 senkrecht zur Nut 15 von ihrer Druckkammerwand 23 verlaüft, an der Druckplatte 11 angeschraubt. Zu dieser Befestigung dient ein Schraubbolzen 32.At its end facing the press belt 7, the holding strip 21 is supported laterally by supporting angles 29 which follow at appropriate intervals and which protrude as far as the holding strip 21 into the region of the groove 15. The support brackets 29 are fixed and rigidly connected to the holding strip 21 at the point of contact, in the present exemplary embodiment by a welding seam 30 which is attached with the aid of a YAG laser welding device. Of course, this fixed connection can also be made by brazing, gluing or screwing. Each support bracket, which is designed as a leaf spring-like sheet metal plate that can be deflected in the direction perpendicular to the plane of the pressure plate 11, is at the end facing away from the point of contact between the support bracket 29 and the retaining strip 21 within a guide groove 31, which is in the pressure plate 11 perpendicular to the groove 15 of its pressure chamber wall 23 vented, screwed to the pressure plate 11. A screw bolt 32 is used for this fastening.

Die in der Nut 15 in Bewegungsrichtung des Preßbandes 7 feststehende Dichtung 18 berührt die Innenseite des Bandttums 7, das sich jedoch mit der Vorschubgeschwindigkeit der Werkstoffbahn 9 unter der Dichtung 18 hinwegbewegt, weshalb eine Dichtung dieser Art auch Gleitflächendichtung genannt wird. Durch diese Relativbewegung zwischen Bandtrum und Dichtung entsteht eine Reibungskraft, die proportional dem Anpreßdruck und dem Gleitreibungskoeffizienten ist. Diese Reibungskraft, die als Schub- oder Zugkraft auf die Dichtung 18 wirkt, muß vollständig in die Druckplatte 11 geleitet werden, ohne daß die Dichtung unzuläßig deformiert wird, da sie andernfalls ihre Dichtfunktion nicht mehr ausfüllen könnte.The seal 18, which is fixed in the groove 15 in the direction of movement of the press belt 7, touches the inside of the belt 7, which, however, moves under the seal 18 at the feed rate of the material web 9, which is why a seal of this type is also called a sliding surface seal. This relative movement between the belt run and the seal creates a frictional force that is proportional to the contact pressure and the sliding friction coefficient is. This frictional force, which acts as a pushing or pulling force on the seal 18, must be conducted completely into the pressure plate 11 without the seal being deformed inadmissibly, since otherwise it could no longer fulfill its sealing function.

Durch die feste und starre Verbindung über die Schweißnaht 30 kann zwischen Halteleiste 21 und Stützwinkel 29 keine Gleitbewegung stattfinden, womit also nicht nur Quer-, sondern auch Längskräfte aufgenommen werden können, und somit werden auch die von der Dichtung 18 auf die Halteleiste 21 übertragenen Schub- und Zugkräfte weitergeleitet in die Stützwinkel 29 und von dort über den Schraubbolzen 32 in die Druckplatte 11. Also werden diese angesprochenen Kräfte vom Pressengestell aufgenommen und führen nicht zu einer Beeinträchtigung der Dichtwirkung der Dichtung 18. Da der Stützwinkel 29 auch Querkräfte aufnimmt, ist auch ein Verkanten der Halteleiste 21 in der Nut 15 ausgeschlossen.Due to the fixed and rigid connection via the weld seam 30, no sliding movement can take place between the holding strip 21 and the support bracket 29, which means that not only transverse but also longitudinal forces can be absorbed, and thus the thrust transmitted from the seal 18 to the holding strip 21 - And tensile forces passed into the support bracket 29 and from there via the bolt 32 into the pressure plate 11. So these forces are absorbed by the press frame and do not impair the sealing effect of the seal 18. Since the support bracket 29 also absorbs transverse forces, it is also tilting of the retaining bar 21 in the groove 15 excluded.

Eine weitere Ausgestaltung einer erfindungsgemäßen Gleitflächendichtung zeigt in der Draufsicht von der Preßbandrückseite as gesehen die Fig. 4 und einen Schnitt entlang der Linie A-A die Fig. 5. Entsprechend der zuerst beschriebenen Dichtungsanordnung ist die aus elastomeren Material bestehende Dichtung 18 in eine U-förmige Halteleiste 33 fest eingesteckt. Diese Halteleiste sitzt wiederum mit nur geringem Spiel vertikal verschiebbar in einer Nut 15 der Druckplatte 11. Über der Halteleiste dem Nutgrund zu ist ebenfalls eine aus einem O-Ring bestehende Nutdichtung 26 angebracht, die die atmosphären- und druckseitigen Nutwände 22 bzw. 23 berührt und über eine Bohrung 27 mit Druckmittel beaufschlagbar ist.A further embodiment of a sliding surface seal according to the invention is shown in plan view from the back of the press belt as shown in FIG. 4 and a section along the line AA in FIG. 5. According to the seal arrangement described first, the seal 18 consisting of elastomeric material is in a U-shaped retaining strip 33 firmly inserted. This retaining strip is in turn seated vertically displaceably in a groove 15 of the pressure plate 11 with only slight play. A groove seal 26 consisting of an O-ring is also attached above the retaining strip and touches the groove and pressure-side groove walls 22 and 23 and can be acted upon by a bore 27 with pressure medium.

In die Halteleiste 33 sind nun jeweils Nuten 34 in zweckmäßig aufeinanderfolgenden Abschnitten eingebracht. In diese Nuten 34 sind jeweils Stützwinkel 35 so eingehängt, daß sie von der Nutdichtung 26 überdeckt werden und damit fest an die Halteleiste 33 gepreßt werden. Der Stützwinkel 35 besitzt an der Stelle, an der er in der Nut 34 eingehängt ist, eine L-förmige Gestalt, so daß eine feste und starre Verbindung mit der Halteleiste 33 entsteht. Ab dem Punkt, wo der Stützwinkel 35 die Halteleiste 33 verläßt, verläuft er schräg in einer Führungsnut 36 in der Druckplatte 11, bis er auf die in Längsrichtung durchgehende Führungsnut 31 stößt, wo er dann wieder abknickt und parallel zu der Druckplatte 11 verläuft. An diesem letzten, zur Druckplatte parallelen Stück ist er wiederum mit der Druckplatte mittels eines Schraubbolzens 32 mit derselben verschraubt. Zur besseren Festigkeit wird der Stützwinkel 35 aus einem Stück gefertigt.Grooves 34 are now introduced into the holding strip 33 in expediently successive sections. In each of these grooves 34, support brackets 35 are suspended in such a way that they are covered by the groove seal 26 and are thus pressed firmly onto the holding strip 33. The support bracket 35 has an L-shaped shape at the point at which it is hooked into the groove 34, so that a firm and rigid connection with the retaining strip 33 is produced. From the point where the support bracket 35 leaves the retaining strip 33, it runs obliquely in a guide groove 36 in the pressure plate 11 until it meets the longitudinal guide groove 31, where it then bends again and runs parallel to the pressure plate 11. At this last piece parallel to the pressure plate, it is in turn screwed to the pressure plate by means of a screw bolt 32. For better strength, the support bracket 35 is made from one piece.

Da der Stützwinkel 35 fest und starr auf die Halteleiste 33 gepreßt wird, kann er die Schub-und Zugkräfte in der Halteleiste 33, die aufgrund der Reibkräfte in der Dichtung 18 entstehen, aufnehmen und in die Druckplatte weiterleiten. Um ein Verkanten der Halteleiste 33 durch Verdrehung um den Schraubbolzen 32 zu vermeiden, kann der Stützwinkel 35 mittels eines zweiten Schraubbolzens 37, wie in Fig. 4 zu sehen ist, in der Druckplatte 11 befestigt sein. Eine andere Möglichkeit ist, wie ebenfalls in Fig. 4 verdeutlicht, die Führungsnut 36 in der Druckplatte 11 nur so groß anzufertigen, daß der Stützwinkel 35 nur geringfügiges seitliches Spiel besitzt oder genau seitlich eingepaßt ist. Bei dem erstgenannten Ausführungsbeispiel kann selbstverständlich zur Verhinderung einer Verdrehung ebenfalls ein zweiter Schraubbolzen im Stützwinkel 29 angebracht werden.Since the support bracket 35 is pressed firmly and rigidly onto the holding bar 33, it can absorb the thrust and tensile forces in the holding bar 33, which arise due to the frictional forces in the seal 18, and transmit them to the pressure plate. In order to prevent the retaining strip 33 from tilting by twisting around the screw bolt 32, the support bracket 35 can be fastened in the pressure plate 11 by means of a second screw bolt 37, as can be seen in FIG. 4. Another possibility is, as also illustrated in FIG. 4, to make the guide groove 36 in the pressure plate 11 only so large that the support bracket 35 has only a slight lateral play or is fitted exactly laterally. In the first-mentioned exemplary embodiment, a second screw bolt can of course also be attached in the support bracket 29 to prevent rotation.

Claims (11)

1. Double belt press, for the application of areal pressure onto continuously advancing web- shaped materials (9), with a rigid press frame, with deflecting drums (1, 2, 3, 4) rotatably borne at bearing bridges (5, 6) of the press frame, with an upper and a lower press belt (7, 8) guided over the deflecting drums (1, 2, 3, 4) and with pressure chambers (19), which are loadable by fluid pressure media for the production of the pressing pressure on the press belt runs (7, 8) and which are bounded upwardly and downwardly by the pressure plates (11, 12) and the inward sides of the press belt runs (7, 8), towards the sides by a sliding surface seal (18) disposed in a retaining strip (21, 33), this retaining strip (21, 33) is displaceably arranged with scant play perpendicularly to the press belt (7, 8) in grooves (15) running round at the rim of the pressure plates (11, 12), a groove seal (26), which consists of an 0-ring chord, lies on the groove base and touches the groove walls (22, 23) of the groove (15) at the atmospheric side and the pressure side, is situated at the retaining strip (21, 33), a fluid pressure medium acts on the groove seal (26) from the groove base of the groove (15), whereby the sliding surface seal (18) is pressed by a force against the inward side of the press belt runs (7, 8) and the retaining strip (21, 33) is provided with lateral support brackets (29, 35), which are firmly mounted at the retaining strip (21, 33), for the reception of tension forces from the retaining strip (21, 33) and their introduction into the pressure plates (11, 12), characterised thereby, that the support brackets (29, 35) are constructed as sheetmetal straps, which are in the manner of leaf springs, let themselves be deflected in a direction perpendicular to the pressure plates (11, 12) and are at their ends fastened at the pressure plates (11, 12), and that the pressure plates (11, 12) adjoining the groove (15) display guide grooves (31, 36), which extend perpendicularly to this groove (15) for the reception of the retaining strip (21, 33) at its pressure chamber wall (23) and in which the sheetmetal straps are guided at at least partial length portions of their sides oriented perpendicularly to the plane of the pressure plates (11, 12), and that connecting bores (27) for the access of pressure medium from the pressure chamber (19) to the groove base are arranged between the pressure chamber and the groove base of the groove (19).
2. Double belt press according to claim 1, characterised thereby, that the support brackets (29) are welded to the retaining strip (21).
3. Double belt press according to claim 1, characterised thereby, that the support brackets (29) are glued to the retaining strip (21).
4. Double belt press according to claim 1, characterised thereby, that the support brackets (29) are hard-soldered to the retaining strip (21).
5. Double belt press according to claim 1, characterised thereby, that the support brackets (29) are screwed to the retaining strip (21).
6. Double belt press according to claim 1, characterised thereby, that the support brackets (35) in the region of the retaining strip (33) possess an L-shaped structure and these support brackets (35) are firmly hooked into an appropriately shaped groove (34) in the retaining strip (33).
7. Double belt press according to one of the claims 1 to 6, characterised thereby, that the support brackets (29, 35) are screwed at their ends together with the pressure plate (11, 12).
8. Double belt press according to claim 7, characterised thereby, that the support brackets (29, 35) are screwed together with the pressure plate (11, 12) by means of a threaded bolt (32).
9. Double belt press according to claim 7, characterised thereby, that the support brackets (29, 35) are screwed together with the pressure plate (11, 12) by means of two or more threaded bolts (32, 37).
10. Double belt press according to one of the claims 1 to 9, characterised thereby, that the spacing (24, 25) of the retaining strip (21, 33) from the groove walls (22, 23) of the groove (15) amounts to less than 0.1 millimetres.
11. Double belt press according to one of the claims 1 to 10, characterised thereby, that the groove seal (26) possesses a round cross-section which is so dimensioned that the groove seal (26) sits wedging laterally in the groove (15) and thereby acts sealingly against the pressure medium in the groove base of the groove (15) as well as also in the pressure chamber (19).
EP85111898A 1984-10-03 1985-09-20 Rubbing surface packing of a double belt press Expired - Lifetime EP0176883B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843436158 DE3436158A1 (en) 1984-10-03 1984-10-03 SLIDING SURFACE SEALS ON DOUBLE BELT PRESSES
DE3436158 1984-10-03

Publications (3)

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EP0176883A1 EP0176883A1 (en) 1986-04-09
EP0176883B1 true EP0176883B1 (en) 1989-03-15
EP0176883B2 EP0176883B2 (en) 1994-04-06

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EP85111898A Expired - Lifetime EP0176883B2 (en) 1984-10-03 1985-09-20 Rubbing surface packing of a double belt press

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US (1) US4665818A (en)
EP (1) EP0176883B2 (en)
JP (1) JPS6186098A (en)
DE (1) DE3436158A1 (en)

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JPS6354223A (en) * 1986-08-25 1988-03-08 Mitsubishi Rayon Eng Co Ltd Continuous pressurizing device
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DE3634273A1 (en) * 1986-10-08 1988-04-21 Santrade Ltd Sealing arrangement for the pressure chamber of a double-belt press
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DE4111022A1 (en) * 1991-04-05 1992-10-08 Hymmen Theodor Gmbh DEVICE FOR APPLYING A SURFACE PRESSING TO PROGRESSIVE WORKPIECES
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US6908295B2 (en) * 2000-06-16 2005-06-21 Avery Dennison Corporation Process and apparatus for embossing precise microstructures and embossing tool for making same
JP4714551B2 (en) * 2005-10-14 2011-06-29 森田技研工業株式会社 Press device with thickness adjustment mechanism
US7946023B2 (en) * 2005-11-22 2011-05-24 Siemens Energy, Inc. Method and apparatus for measuring compression in a stator core
JP4834601B2 (en) * 2007-04-26 2011-12-14 株式会社ブリヂストン Rubber sheet vulcanizing apparatus and rubber sheet vulcanizing method
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CN114585504A (en) * 2019-10-18 2022-06-03 瓦林格创新股份有限公司 Continuous pressing device for manufacturing building panels
CN111607917B (en) * 2020-05-20 2023-08-15 浙江信胜科技股份有限公司 Deviation-preventing sheet feeding structure for material belt and sheet ironing machine

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DE2937971A1 (en) * 1979-09-20 1981-04-02 Theodor Hymmen Kg, 4800 Bielefeld DEVICE FOR APPLYING A SURFACE PRESS TO PROGRESSIVE WORKPIECES
DE2937972A1 (en) * 1979-09-20 1981-04-02 Theodor Hymmen Kg, 4800 Bielefeld DEVICE FOR APPLYING A SURFACE PRESSING TO PROGRESSIVE WORKPIECES
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Also Published As

Publication number Publication date
DE3436158A1 (en) 1986-04-10
JPS6186098A (en) 1986-05-01
EP0176883A1 (en) 1986-04-09
US4665818A (en) 1987-05-19
DE3436158C2 (en) 1993-06-17
EP0176883B2 (en) 1994-04-06
JPH0242315B2 (en) 1990-09-21

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