EP1779999A1 - Pressure equalizing fabric for hydraulic hot pressing installation - Google Patents

Pressure equalizing fabric for hydraulic hot pressing installation Download PDF

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Publication number
EP1779999A1
EP1779999A1 EP20060019667 EP06019667A EP1779999A1 EP 1779999 A1 EP1779999 A1 EP 1779999A1 EP 20060019667 EP20060019667 EP 20060019667 EP 06019667 A EP06019667 A EP 06019667A EP 1779999 A1 EP1779999 A1 EP 1779999A1
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EP
European Patent Office
Prior art keywords
threads
metal
pressure
pressure compensation
fabric
Prior art date
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.)
Granted
Application number
EP20060019667
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German (de)
French (fr)
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EP1779999B1 (en
Inventor
Rolf Dr. Espe
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Rheinische Filztuchfabrik GmbH
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Rheinische Filztuchfabrik GmbH
Rheinische PRESS PAD GmbH
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Application filed by Rheinische Filztuchfabrik GmbH, Rheinische PRESS PAD GmbH filed Critical Rheinische Filztuchfabrik GmbH
Priority to PL06019667T priority Critical patent/PL1779999T3/en
Publication of EP1779999A1 publication Critical patent/EP1779999A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3065—Including strand which is of specific structural definition
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/322—Warp differs from weft
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/322—Warp differs from weft
    • Y10T442/3228—Materials differ
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/3293—Warp and weft are identical and contain at least two chemically different strand materials

Definitions

  • the invention relates to a pressure compensation fabric, in particular press pad, for use in hydraulic Walkerpressanlagen, comprising metal filaments, both as warp and as weft threads of the press pad, and high temperature resistant elastomeric threads, the latter preferably with stabilizing core threads, wherein the elastomeric threads either as warp or as weft threads alternately with the metal threads are arranged.
  • Press pads are used in various types of press systems, such as the so-called one-day short-cycle presses for the lamination of particleboard, MDF or HDF boards with thermoset resins such as melamine, melamine-urea mixed resins or phenolic resins, but also in multi-floor high-speed presses. and low pressure presses for the production of high pressure laminate, compact and plywood boards.
  • press pads can be used in all press systems.
  • Such press pads are usually constructed in the form of a fabric, wherein the materials are resistant to high temperatures, since the operating temperatures in the press systems are partly above 200 ° C. Furthermore, they should, if possible, have a large recovery property with an intermittent pressure load and have a fast thermal conductivity.
  • Thermoset resins are very sensitive to pressure tolerances when forming surfaces on the aforementioned plate materials. Thus surface defects can arise due to unequal pressure distribution.
  • Known manner prevail in the coating systems considerable thickness tolerances, which add up from the press system, press plates and the respective pressed material.
  • the press pads therefore have the task to compensate for these thickness tolerances and to transmit the pressing pressure uniformly and over the entire surface of the material to be pressed, at the same time a rapid and uniform heat transfer of the hotplate temperature of the press plant is aimed at the pressed material.
  • the flexible upholstery fabric consists of a yarn of aromatic polyamide, which may be mixed with other gammaterials.
  • the textile fabric contains metal filaments, wherein the proportion between 0 and 70 wt.% Is to adjust the required thermal conductivity accordingly.
  • EP 0 713 762 A2 is a press pad for high and low pressure presses made of different materials.
  • a likewise known from the prior art press pad is from the EP 0 735 949 B1 known, wherein the warp threads and / or weft threads have a silicone elastomer and in the fabric metal wire in the form of full filaments or with silicone sheath are included.
  • a press pad consisting of a fabric comprising a substantial proportion of a blend elastomer prepared by crosslinking a mixture of a silicone rubber and a fluororubber or of a silicone rubber and a fluorosilicone rubber.
  • the proportion of fluororubber or fluorosilicone rubber should be at least 4% by weight, preferably 10% by weight.
  • the warp and / or weft threads contain metal threads.
  • a press pad known which is used for the production of printed circuit boards.
  • the known pad may comprise a woven fabric, a paper, a film or a sheet-like structure, which is combined as a layer with at least one further layer of a fluoroelastomer.
  • the fluoroelastomer should have a fluororubber component of the polyol curative system, a curative, a cure accelerator, and an acid acceptor.
  • Another press pad goes out of the EP 1 300 235 B1 out.
  • This is a metal mesh, consisting of core threads with stainless steel sheath and twisted copper wires with aramid core, wherein the metal fabric with a Silicone rubber coating is provided. To ensure heat transfer, the copper threads protrude from the silicone rubber surface.
  • the melamine resins are first low-viscosity fusible and flowable and then crosslink to insoluble, infusible hard, abrasion-resistant and thermally resistant plastics. This is called a so-called polycondensation, whereby water and formaldehyde is formed.
  • the resulting in the condensation reaction water and formaldehyde can not be released in vapor form, since the pressing pressure prevailing in the press, is above the vapor pressure of the water and also presses the two gas products in the film layer or in the support plate.
  • the flow time and the melt viscosity of the resin are determined essentially by the degree of condensation, the ability to react and the temperature and must be adjusted so that the vapor bubbles can migrate before the resin melt solidifies and the surface is formed. If these vapor bubbles can not diffuse sufficiently into the carrier plate, cloudy to milky surfaces develop. This haze is caused by the different refractive indices of the predominant materials.
  • the existing temperatures are relatively constant, so that the resin flow can not be influenced by temperature change, which naturally does not want to change the predetermined pressing times. Although the heat flow in all press pads is different in speed but uniform, no positive influence on the resin viscosity or the resin flow can be achieved.
  • the invention has for its object to propose a press pad, which ensures a better diffusion of the vapor bubbles and thus a transparent and closed melamine resin surface is achieved.
  • the liquid resin phase should be extended.
  • the object is achieved in that the thickness is determined in the non-compressed state of the press pad of the elastomeric threads and thus the contact points of the press pad with parts of the Edelpressstrom at moderate pressure build-up are first formed by the elastomeric threads, wherein the elastomeric threads are compressible such that at further Pressure increase up to the total pressure, further contact points are formed by the metal threads.
  • Advantage of the press pad according to the invention is a controlled heat flow in the manner of a pressure-dependent heat flow.
  • the heat flow takes place during this time essentially only by the elastomeric threads, since the metal threads are not yet in contact with the heating plate and the press plate. Since the viscosity or the degree of crosslinking of the resin is temperature-dependent, the liquid resin phase is extended until the metal threads of the press pad come into contact with the heat-conveying hot plate and the press plate by the increasing pressing pressure.
  • the press pad according to the invention thus allows a time-delayed increase in the prevailing at the surface of the press pad temperature to provide more time for flow of the resin over an extension of the "low-temperature phase".
  • the press pad according to the invention has metal threads both as warp threads and as weft threads, whereby the press pad is very dimensionally stable.
  • the high-temperature resistant elastomer threads are arranged either as warp threads or as weft threads alternately with the metal threads.
  • Either an elastomer thread and a metal thread can be arranged alternately, or in each case one elastomer thread and two or three metal threads, or vice versa, wherein the invention should not be limited to the aforementioned variants.
  • the diameter of the elastomer threads is at least twice, preferably three times, the diameter of the metal threads.
  • the ratio of the diameters of the elastomeric filaments to that of the metal filaments increases, the length of the liquid resin phase increases, and thus the period during which the vapors can diffuse into the paper web during the pressing operation.
  • too large diameters of the elastomer threads counteract the need for short pressing times.
  • the elastomer threads are advantageous for the elastomer threads to consist of high temperature resistant elastomers such as silicone rubber, fluorosilicone rubber, fluororubber, or a copolymer of the aforementioned rubbers.
  • the stabilizing core threads can consist of single filaments, and it is again advantageous if they are high-temperature resistant core threads, such as polyaramids such as Kevlar or Nomex filaments.
  • the elastomeric threads are provided with metallic core threads either of monofilaments or of stranded metal threads such as copper strands, brass strands, (noble) steel strands, etc.
  • the elastomer threads in the elastomer sheath may contain thermally conductive substances, such as metal powder.
  • Elastomers according to DIN 7724 are polymeric materials which behave entropy-elastically (rubber-elastic) in the service temperature range. Elastomers, also referred to as rubber (excluding hard rubber) or vulcanizates in German usage, are formed by crosslinking of rubbers by crosslinking in the majority of cases or by cross-linking copolymerization of low molecular weight starting materials. Elastomers can not be significantly deformed by heat or moderate pressure. In general, their tensile set remains below 2%.
  • FIG. 1 shows a metallic strand of individual stranded brass threads 2, this metal thread 1 being processed both as a warp thread and as a weft thread of a pressure compensation fabric 6.
  • FIG. 2 shows an elastomer thread 3 which consists of a core thread 4 and an elastomer sheath 5, for example of a copolymer fluorosilicone / silicone rubber.
  • the core thread 4 consists of stranded copper threads.
  • the elastomer thread 3 is processed as a weft thread of the pressure compensation fabric 6.
  • the upwardly cranked elastomeric threads 3 in the weft or the cranked metal threads 1 can be seen in the weft and in the warp of the press cushion fabric.
  • the elastomer threads 3 have a significantly larger diameter than the metal threads 1, wherein the diameter of the elastomer threads 3 is advantageously at least twice as large as that of the metal threads. 1
  • FIG. 4 shows a section through the press cushion according to the invention according to FIG. 3, which is arranged in a press installation between a heating plate 7 and a press plate 8.
  • the contact points of the press pad are initially formed at moderate pressure build-up only by the elastomeric threads 3.
  • the metal filaments 1 all, even at their extreme points ("wave crests") at a distance from the plane formed by the extreme points ("peaks") of the elastomeric filaments 3, whereby the thermal conductivity is initially lower. Only with further pressure increase up to the total pressure additional contact points 9 are formed by the stranded brass threads 2, so that then a faster heat flow is produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Press Drives And Press Lines (AREA)
  • Laminated Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Surface Heating Bodies (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

Woven pressure padding for hydraulic hot presses comprises metal threads with heat-resistant elastomer threads incorporated in such a way as to form the first contact points on the surface, thus reducing heat flow from the heating plate to the pressure plate until they are compressed under increasing pressure, enabling rapid heat transfer via metal contact points. Pressure-compensating woven fabric (6), especially pressure padding for use in hydraulic hot-press systems, comprising high temperature-resistant elastomer threads (3) (with or without stabilising metallic or non-metallic core threads (4)) and metal threads (1). In this fabric, the elastomer weft threads (3) or warp threads are threaded through the metal warp threads (1) or weft threads and the alternating metal weft threads (1) or warp threads in such a way that the upper points of contact on the padding are formed by elastomer threads, resulting in a reduced heat flow from the heating plate to the pressure plate when used in a press; the elastomer threads (3) are only compressed when the applied pressure is increased, so that the metal threads (1) then form the thermal contact and heat is rapidly transferred from the heating plate to the pressure plate.

Description

Einleitungintroduction

Die Erfindung betrifft ein Druckausgleichsgewebe, insbesondere Presspolster, für den Einsatz in hydraulischen Heizpressanlagen, umfassend Metallfäden, sowohl als Kettfäden als auch als Schussfäden des Presspolsters, und hochtemperaturbeständige Elastomerfäden, letztgenannte vorzugsweise mit stabilisierenden Seelenfäden, wobei die Elastomerfäden entweder als Kettfäden oder als Schussfäden alternierend mit den Metallfäden angeordnet sind.The invention relates to a pressure compensation fabric, in particular press pad, for use in hydraulic Heizpressanlagen, comprising metal filaments, both as warp and as weft threads of the press pad, and high temperature resistant elastomeric threads, the latter preferably with stabilizing core threads, wherein the elastomeric threads either as warp or as weft threads alternately with the metal threads are arranged.

Presspolster finden Einsatz in verschiedenen Arten von Pressanlagen, wie zum Beispiel den sogenannten Einetagen- Kurztaktpressen für die Kaschierung von Span-, MDF- oder HDF- Platten mit Duroplastharzen wie Melamin-, Melamin-Harnstoff-Mischharzen oder Phenolharzen, aber auch in Mehretagen Hoch- und Niederdruckpressen zur Herstellung von Hochdrucklaminat-, Kompakt- und Sperrholzplatten. Grundsätzlich können Presspolster in allen Pressenanlagen eingesetzt werden. Derartige Presspolster sind in der Regel in Form eines Gewebes aufgebaut, wobei die Materialien hochtemperaturbeständig sind, da die Einsatztemperaturen in den Pressenanlagen zum Teil bei oberhalb von 200 °C liegen. Weiterhin sollten sie nach Möglichkeit eine große Rückstelleigenschaft bei einer intermittierenden Druckbelastung aufweisen und eine schnelle Wärmeleitfähigkeit besitzen.Press pads are used in various types of press systems, such as the so-called one-day short-cycle presses for the lamination of particleboard, MDF or HDF boards with thermoset resins such as melamine, melamine-urea mixed resins or phenolic resins, but also in multi-floor high-speed presses. and low pressure presses for the production of high pressure laminate, compact and plywood boards. In principle, press pads can be used in all press systems. Such press pads are usually constructed in the form of a fabric, wherein the materials are resistant to high temperatures, since the operating temperatures in the press systems are partly above 200 ° C. Furthermore, they should, if possible, have a large recovery property with an intermittent pressure load and have a fast thermal conductivity.

Duroplastharze sind bei der Ausbildung von Oberflächen auf den vorgenannten Plattenmaterialien sehr sensibel in Bezug auf Drucktoleranzen. So können Oberflächenstörungen durch ungleiche Druckverteilung entstehen. Bekannter Weise herrschen in den Beschichtungsanlagen erhebliche Dickentoleranzen vor, die sich aus der Pressenanlage, Pressblechen und dem jeweiligen Pressgut addieren. Die Presspolster haben daher die Aufgabe, diese Dickentoleranzen auszugleichen und den Pressdruck gleichmäßig und vollflächig auf das Pressgut zu übertragen, wobei gleichzeitig eine schnelle und gleichmäßige Wärmeübertragung der Heizplattentemperatur der Pressenanlage auf das Pressgut angestrebt wird.Thermoset resins are very sensitive to pressure tolerances when forming surfaces on the aforementioned plate materials. Thus surface defects can arise due to unequal pressure distribution. Known manner prevail in the coating systems considerable thickness tolerances, which add up from the press system, press plates and the respective pressed material. The press pads therefore have the task to compensate for these thickness tolerances and to transmit the pressing pressure uniformly and over the entire surface of the material to be pressed, at the same time a rapid and uniform heat transfer of the hotplate temperature of the press plant is aimed at the pressed material.

Beispielsweise sind aus der DE 90 17 587 U1 gattungsgemäße Presspolster bekannt. Das flexible Polstergewebe besteht aus einem Garn aus aromatischem Polyamid, das eventuell mit anderen Gammaterialien gemischt ist. Das textile Gewebe enthält Metallfäden, wobei der Anteil zwischen 0 und 70 Gew. % liegt, um die geforderte Wärmeleitfähigkeit entsprechend einzustellen.For example, are from the DE 90 17 587 U1 generic press pad known. The flexible upholstery fabric consists of a yarn of aromatic polyamide, which may be mixed with other gammaterials. The textile fabric contains metal filaments, wherein the proportion between 0 and 70 wt.% Is to adjust the required thermal conductivity accordingly.

Aus der EP 0 713 762 A2 geht ein Presspolster für Hoch- und Niederdruckpressen aus verschiedenen Materialien hervor.From the EP 0 713 762 A2 is a press pad for high and low pressure presses made of different materials.

Ein ebenfalls aus dem Stand der Technik bekanntes Presspolster ist aus der EP 0 735 949 B1 bekannt, wobei die Kettfäden und/oder Schussfäden ein Silikonelastomer aufweisen und in dem Gewebe Metalldraht in Form von Vollfäden oder mit Silikonummantelung enthalten sind.A likewise known from the prior art press pad is from the EP 0 735 949 B1 known, wherein the warp threads and / or weft threads have a silicone elastomer and in the fabric metal wire in the form of full filaments or with silicone sheath are included.

Weiterhin ist aus der DE 200 08 249 und aus der EP 1 136 248 B1 ein Presspolster bestehend aus einem Gewebe bekannt, das einen wesentlichen Anteil eines Blend-Elastomers aufweist, das durch Vernetzung einer Mischung aus einem Silikonkautschuk und einem Fluorkautschuk oder aus einem Silikonkautschuk und einem Fluorsilikonkautschuk hergestellt ist. Dabei sollte der Anteil an Fluorkautschuk oder Fluorsilikonkautschuk mindesten bei 4 Gew. %, vorzugsweise bei 10 Gew. % liegen. Die Kett- und/oder Schussfäden enthalten Metallfäden.Furthermore, from the DE 200 08 249 and from the EP 1 136 248 B1 a press pad consisting of a fabric comprising a substantial proportion of a blend elastomer prepared by crosslinking a mixture of a silicone rubber and a fluororubber or of a silicone rubber and a fluorosilicone rubber. The proportion of fluororubber or fluorosilicone rubber should be at least 4% by weight, preferably 10% by weight. The warp and / or weft threads contain metal threads.

Ferner ist aus der EP 0 978 528 A1 ein Presspolster bekannt, das zur Herstellung von Leiterplatten herangezogen wird. Das vorbekannte Polster kann ein Gewebe, ein Papier, einen Film oder eine blattartige Struktur aufweisen, die jeweils als Schicht mit mindestens einer weiteren Schicht aus einem Fluorelastomer kombiniert ist. Vorzugsweise soll das Fluorelastomer eine Fluorkautschukkomponente des Polyol-Vulkanisations-Systems, ein Vulkanisationsmittel, einen Vulkanisationsbeschleuniger sowie einen Säure-Akzeptor aufweisen.Furthermore, from the EP 0 978 528 A1 a press pad known, which is used for the production of printed circuit boards. The known pad may comprise a woven fabric, a paper, a film or a sheet-like structure, which is combined as a layer with at least one further layer of a fluoroelastomer. Preferably, the fluoroelastomer should have a fluororubber component of the polyol curative system, a curative, a cure accelerator, and an acid acceptor.

Ein weiteres Presspolster geht aus der EP 1 300 235 B1 hervor. Hierbei handelt es sich um ein Metallgewebe, bestehend aus Kernfäden mit Edelstahlummantelung und gezwirnten Kupferdrähten mit Aramid-Seele, wobei das Metallgewebe mit einer Silikonkautschukbeschichtung versehen wird. Um eine Wärmeübertragung zu gewährleisten, stehen die Kupferfäden aus der Silikonkautschukoberfläche hervor.Another press pad goes out of the EP 1 300 235 B1 out. This is a metal mesh, consisting of core threads with stainless steel sheath and twisted copper wires with aramid core, wherein the metal fabric with a Silicone rubber coating is provided. To ensure heat transfer, the copper threads protrude from the silicone rubber surface.

Schließlich sei noch die DE 297 21 495 U1 genannt, aus der ein Presspolster für den Einsatz in Laminierpressen mit einem Gewebe bekannt ist, das zwei Gruppen jeweils parallel verlaufenden Fäden aufweist, wobei sich die Fäden der ersten und der zweiten Gruppe kreuzen. Die Fäden der ersten Gruppe bestehen aus Metall oder weisen zumindest einen Metallanteil auf, und die Fäden der zweiten Gruppe bestehen aus gummielastischem Material oder weisen zumindest einen Anteil davon auf. Um ein Presspolster mit einer besseren Wärmeleitfähigkeit zu schaffen, ist die Fadendichte der Fäden der zweiten Gruppe so groß, dass die Fäden der ersten Gruppe nur unter Komprimierung der Fäden der zweiten Gruppe durch letztgenannte hindurchgehen. Dadurch, dass die Fäden der ersten Gruppe aufgrund des geringen Abstands zwischen den Fäden der zweiten Gruppe dazu gezwungen werden, sehr steil zwischen diesen Fäden hindurchzugehen, ergeben sich kurze Wege zwischen den beiden Oberflächen des Presspolsters, so dass das Aufheizen des Pressguts schneller erfolgt.Finally, it is still the DE 297 21 495 U1 from which a press pad for use in laminating presses with a fabric is known, which has two groups of parallel threads in each case, wherein the threads of the first and the second group intersect. The threads of the first group are made of metal or have at least one metal portion, and the threads of the second group are made of rubber-elastic material or have at least a portion thereof. In order to provide a press pad with a better thermal conductivity, the thread density of the threads of the second group is so great that the threads of the first group pass through the latter only by compressing the threads of the second group. The fact that the threads of the first group are forced to pass through very steeply between these threads due to the small distance between the threads of the second group, resulting in short distances between the two surfaces of the press pad, so that the heating of the pressed material is faster.

Für die moderne Beschichtungstechnologie, wie sie beispielsweise in Einetagen-Kurztaktpressen heute stattfindet, weisen die aufgeführten Presspolster in ihrer physikalischen Struktur Mängel auf.For modern coating technology, as is the case for example in single-day short-cycle presses today, the listed press cushions have defects in their physical structure.

Speziell bei der hochsensiblen HDF- Plattenbeschichtung (High Density Fiberboard) mit Melaminharzoverlay und Al2O3 - Füllung und einem Melaminharzdekorfilm zur Herstellung von Fußbodenplatten, werden extrem hohe Anforderungen an das Presspolster gestellt, so dass es bei einer nicht angepassten Wärmeübertragung von Heizplatte zum Pressblech zu Oberflächenstörungen der auskondensierten Melaminharze kommt. Da man heute naturgemäß kürzeste Presszeiten anstrebt, muss der Harzfluss trotzdem so gesteuert sein, dass der bei der Harzkondensation entstehende Formaldehyd- und Wasserdampf auch ausreichend schnell in die Papierbahn und Plattenoberfläche diffundieren kann.Particularly in the highly sensitive HDF (High Density Fiberboard) panel coating with melamine resin overlay and Al 2 O 3 filling and a melamine resin decorating film for the production of floor panels, extremely high demands are placed on the press cushion, so that it does not match the heat transfer from hot plate to press plate to surface defects of the condensed melamine resins comes. Since today naturally the shortest pressing times are desired, the resin flow must nevertheless be controlled so that the formaldehyde and water vapor formed in the resin condensation can also diffuse sufficiently quickly into the paper web and plate surface.

Während der Beschichtung in der Presse sind die Melaminharze zunächst niedrigviskos schmelzbar und fließfähig und vernetzen dann zu unlöslichen, unschmelzbar harten, abriebfesten sowie thermisch beständigen Kunststoffen. Man spricht hier von einer sogenannten Polykondensation, wobei Wasser und Formaldehyd entsteht. Das bei der Kondensationsreaktion entstehende Wasser und Formaldehyd kann nicht dampfförmig frei werden, da der Pressdruck, der in der Presse vorherrscht, über dem Dampfdruck des Wassers liegt und die beiden Gasprodukte ebenfalls in die Filmschicht beziehungsweise in die Trägerplatte drückt. Die Fließzeit und die Schmelzviskosität des Harzes werden im Wesentlichen durch den Kondensationsgrad, die Reatktionsfähigkeit und die Temperatur ermittelt und müssen so abgestimmt sein, dass die Dampfblasen abwandern können bevor die Harzschmelze erstarrt und die Oberfläche ausgebildet ist. Können diese Dampfblasen nicht ausreichend in die Trägerplatte diffundieren, so entstehen trübe bis milchige Oberflächen. Diese Trübung wird durch die unterschiedlichen Brechungsindizes der vorherrschenden Materialien verursacht. In den Pressenanlagen sind die vorhandenen Temperaturen relativ konstant, so dass der Harzfluss nicht durch Temperaturänderung beeinflusst werden kann, wobei man naturgemäß die vorgegebenen Presszeiten nicht verändern will. Da der Wärmefluss bei allen Presspolstern zwar unterschiedlich schnell aber gleichmäßig ist, kann auch hierüber keine positive Beeinflussung der Harzviskosität beziehungsweise des Harzflusses erreicht werden.During the coating in the press, the melamine resins are first low-viscosity fusible and flowable and then crosslink to insoluble, infusible hard, abrasion-resistant and thermally resistant plastics. This is called a so-called polycondensation, whereby water and formaldehyde is formed. The resulting in the condensation reaction water and formaldehyde can not be released in vapor form, since the pressing pressure prevailing in the press, is above the vapor pressure of the water and also presses the two gas products in the film layer or in the support plate. The flow time and the melt viscosity of the resin are determined essentially by the degree of condensation, the ability to react and the temperature and must be adjusted so that the vapor bubbles can migrate before the resin melt solidifies and the surface is formed. If these vapor bubbles can not diffuse sufficiently into the carrier plate, cloudy to milky surfaces develop. This haze is caused by the different refractive indices of the predominant materials. In the press systems, the existing temperatures are relatively constant, so that the resin flow can not be influenced by temperature change, which naturally does not want to change the predetermined pressing times. Although the heat flow in all press pads is different in speed but uniform, no positive influence on the resin viscosity or the resin flow can be achieved.

Aufgabetask

Der Erfindung liegt die Aufgabe zugrunde, ein Presspolster vorzuschlagen, mit dessen Hilfe ein besseres Diffundieren der Dampfblasen gewährleistet und somit eine transparente und geschlossene Melaminharzoberfläche erzielt wird. Insbesondere soll die flüssige Harzphase verlängert werden.The invention has for its object to propose a press pad, which ensures a better diffusion of the vapor bubbles and thus a transparent and closed melamine resin surface is achieved. In particular, the liquid resin phase should be extended.

Lösungsolution

Die Aufgabe wird dadurch gelöst, dass die Dicke im nicht komprimierten Zustand des Presspolsters von den Elastomerfäden bestimmt ist und somit die Kontaktstellen des Presspolsters mit Teilen der Heizpressanlage bei mäßigem Druckaufbau zunächst durch die Elastomerfäden gebildet sind, wobei die Elastomerfäden derart komprimierbar sind, dass bei weiterer Drucksteigerung bis zum Gesamtpressdruck weitere Kontaktstellen durch die Metallfäden gebildet sind.The object is achieved in that the thickness is determined in the non-compressed state of the press pad of the elastomeric threads and thus the contact points of the press pad with parts of the Heizpressanlage at moderate pressure build-up are first formed by the elastomeric threads, wherein the elastomeric threads are compressible such that at further Pressure increase up to the total pressure, further contact points are formed by the metal threads.

Vorteil des erfindungsgemäßen Presspolsters ist ein gesteuerter Wärmefluss nach Art eines druckabhängigen Wärmeflusses.Advantage of the press pad according to the invention is a controlled heat flow in the manner of a pressure-dependent heat flow.

Die Teile der Heizpressanlage, die mit dem Pressgut in Kontakt kommen, insbesondere die Pressbleche, rufen aufgrund der zu Beginn des Pressvorgangs herrschenden Temperatur bereits ein Schmelzen des Melaminharzes hervor, welches gleitzeitig eine Viskositätserniedrigung des Harzes darstellt. Der Wärmefluss erfolgt während dieser Zeit im Wesentlichen nur durch die Elastomerfäden, da die Metallfäden noch nicht mit der Heizplatte und dem Pressblech in Kontakt kommen. Da die Viskosität bzw. der Vernetzungsgrad des Harzes temperaturabhängig ist, wird die flüssige Harzphase solange verlängert, bis die Metallfäden des Presspolsters durch den ansteigenden Pressdruck in Kontakt mit der wärmefördernden Heizplatte und dem Pressblech kommen. Erst wenn der Gesamtdruck der Heizpressenanlage wirkt, entsteht ein gesteigerter Wärmefluss (erst jetzt kommen die Metallfäden sowohl mit der Heizplatte als auch dem Pressblech in Kontakt, wodurch die Wärmeleitfähigkeit des Polsters deutlich ansteigt). Es kommt somit zu einem Anstieg der Harzviskosität bzw. des Vemetzungsgrades des Harzes. Dieses hat zur Folge, dass sich - anders als bei bekannten Presspolstern - eine transparente und geschlossene Oberfläche ausbildet. Selbst bei tiefen Prägestrukturen und relativ kurzen Gesamtpresszeiten bewirkt die optimale Druckverteilung die Ausbildung von einwandfreien Oberflächen. Das erfindungsgemäße Presspolster erlaubt somit einen zeitlich verzögerten Anstieg der an der Oberfläche des Presspolsters herrschenden Temperatur, um über eine Verlängerung der "Niedertemperaturphase" mehr Zeit zum Fließen des Harzes bereitzustellen.The parts of the Heizpressanlage that come into contact with the pressed material, in particular the press plates, call due to the prevailing at the beginning of the pressing process temperature already a melting of the melamine resin forth, which is gleitzeitig a viscosity reduction of the resin. The heat flow takes place during this time essentially only by the elastomeric threads, since the metal threads are not yet in contact with the heating plate and the press plate. Since the viscosity or the degree of crosslinking of the resin is temperature-dependent, the liquid resin phase is extended until the metal threads of the press pad come into contact with the heat-conveying hot plate and the press plate by the increasing pressing pressure. Only when the total pressure of the hot pressing plant acts, there is an increased heat flow (only now come the metal threads with both the heating plate and the press plate in contact, whereby the thermal conductivity of the pad increases significantly). There is thus an increase in the resin viscosity or the degree of crosslinking of the resin. This has the consequence that - in contrast to known press pads - forms a transparent and closed surface. Even with deep embossing structures and relatively short overall press times, the optimal pressure distribution results in the formation of flawless surfaces. The press pad according to the invention thus allows a time-delayed increase in the prevailing at the surface of the press pad temperature to provide more time for flow of the resin over an extension of the "low-temperature phase".

Das erfindungsgemäße Presspolster weist Metallfäden sowohl als Kettfäden als auch als Schussfäden auf, wodurch das Presspolster sehr formstabil wird.The press pad according to the invention has metal threads both as warp threads and as weft threads, whereby the press pad is very dimensionally stable.

Erfindungsgemäß sind die hochtemperaturbeständigen Elastomerfäden entweder als Kettfäden oder als Schussfäden alternierend mit den Metallfäden angeordnet. Dabei können entweder jeweils ein Elastomerfaden und ein Metallfaden abwechselnd angeordnet werden, oder jeweils ein Elastomerfaden und zwei oder drei Metallfäden, oder umgekehrt, wobei die Erfindung nicht auf die zuvor genannten Varianten beschränkt sein soll.According to the invention, the high-temperature resistant elastomer threads are arranged either as warp threads or as weft threads alternately with the metal threads. Either an elastomer thread and a metal thread can be arranged alternately, or in each case one elastomer thread and two or three metal threads, or vice versa, wherein the invention should not be limited to the aforementioned variants.

Es ist von Vorteil, wenn der Durchmesser der Elastomerfäden mindestens das Doppelte, vorzugsweise das Dreifache, des Durchmessers der Metallfäden beträgt. Bei steigendem Verhältnis der Durchmesser der Elastomerfäden zu dem der Metallfäden steigt die Länge der flüssigen Harzphase und somit der Zeitraum in dem die Dämpfe während des Pressvorgangs in die Papierbahn diffundieren können. Allerdings stehen zu große Durchmesser der Elastomerfäden dem Bedürfnis von kurzen Presszeiten entgegen.It is advantageous if the diameter of the elastomer threads is at least twice, preferably three times, the diameter of the metal threads. As the ratio of the diameters of the elastomeric filaments to that of the metal filaments increases, the length of the liquid resin phase increases, and thus the period during which the vapors can diffuse into the paper web during the pressing operation. However, too large diameters of the elastomer threads counteract the need for short pressing times.

Aufgrund der hohen Temperaturen, die auf ein Presspolster wirken ist es vorteilhaft, wenn die Elastomerfäden aus hochtemperaturbeständigen Elastomeren wie zum Beispiel Silikonkautschuk, Fluorsilikonkautschuk, Fluorkautschuk oder einem Copolymer aus den zuvor erwähnten Kautschukarten bestehen.Because of the high temperatures that act on a press pad, it is advantageous for the elastomer threads to consist of high temperature resistant elastomers such as silicone rubber, fluorosilicone rubber, fluororubber, or a copolymer of the aforementioned rubbers.

Die stabilisierenden Seelenfäden können aus Einzelfilamenten bestehen, wobei es wiederum von Vorteil ist, wenn es sich um hochtemperaturbeständige Seelenfäden, wie beispielsweise aus Polyaramiden wie Kevlar-, oder Nomexfilamenten, handelt.The stabilizing core threads can consist of single filaments, and it is again advantageous if they are high-temperature resistant core threads, such as polyaramids such as Kevlar or Nomex filaments.

Darüber hinaus ist es aus Stabilitätsgründen besonders günstig, wenn die Elastomerfäden mit metallischen Seelenfäden entweder aus Einzelfäden oder aus verlitzten Metallfäden wie zum Beispiel Kupferlitzen, Messinglitzen, (Edel-) Stahllitzen etc ausgestattet sind.In addition, it is particularly favorable for reasons of stability if the elastomeric threads are provided with metallic core threads either of monofilaments or of stranded metal threads such as copper strands, brass strands, (noble) steel strands, etc.

Zur weiteren Verbesserung der Wärmeleitfähigkeitseigenschaften der Presspolster können die Elastomerfäden in der Elastomerummantelung wärmeleitfähige Stoffe, wie Metallpulver, enthalten.To further improve the thermal conductivity properties of the press pads, the elastomer threads in the elastomer sheath may contain thermally conductive substances, such as metal powder.

Elastomere sind nach DIN 7724 polymere Werkstoffe, die sich im Gebrauchstemperaturbereich entropieelastisch (gummielastisch) verhalten. Elastomere, im deutschen Sprachgebrauch auch als Gummi (ausgenommen Hartgummi) oder Vulkanisate bezeichnet, entstehen durch hauptvalenzmäßige weitmaschige Vernetzung von Kautschuken oder durch vernetzende Copolymerisation niedermolekularer Ausgangsprodukte. Elastomere können weder durch Hitzeeinwirkung noch durch mäßigen Druck wesentlich verformt werden. Im allgemeinen liegt ihr Zugverformungsrest unter 2 %.Elastomers according to DIN 7724 are polymeric materials which behave entropy-elastically (rubber-elastic) in the service temperature range. Elastomers, also referred to as rubber (excluding hard rubber) or vulcanizates in German usage, are formed by crosslinking of rubbers by crosslinking in the majority of cases or by cross-linking copolymerization of low molecular weight starting materials. Elastomers can not be significantly deformed by heat or moderate pressure. In general, their tensile set remains below 2%.

Ausführungsbeispielembodiment

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels eines Presspolsters, das in den Zeichnungen dargestellt ist, näher erläutert.The invention will be explained in more detail with reference to an embodiment of a press pad, which is shown in the drawings.

Es zeigt

Figur 1 :
eine Litze aus Messingfäden,
Figur 2:
einen Elastomerfaden mit Seelenfaden,
Figur 3:
ein erfindungsgemäßes Presspolstergewebe in der Draufsicht, und
Figur 4:
einen Schnitt durch das Presspolstergewebe gemäß Figur 3.
It shows
FIG. 1:
a strand of brass threads,
FIG. 2:
an elastomer thread with core thread,
FIG. 3:
an inventive press pad fabric in plan view, and
FIG. 4:
a section through the press cushion fabric according to Figure 3.

Die Figur 1 zeigt eine metallische Litze aus einzelnen verlitzten Messingfäden 2, wobei dieser Metallfaden 1 sowohl als Kettfaden als auch als Schussfaden eines Druckausgleichsgewebes 6 verarbeitet wird.FIG. 1 shows a metallic strand of individual stranded brass threads 2, this metal thread 1 being processed both as a warp thread and as a weft thread of a pressure compensation fabric 6.

In Figur 2 ist ein Elastomerfaden 3 dargestellt, der aus einem Seelenfaden 4 und einer Elastomerummantelung 5, beispielsweise aus einem Copolymer-Fluorsilikon-/Silikonkautschuk, besteht. Der Seelenfaden 4 besteht aus verlitzten Kupferfäden. In dem vorliegenden Beispiel wird der Elastomerfaden 3 als Schussfaden des Druckausgleichsgewebes 6 verarbeitet.FIG. 2 shows an elastomer thread 3 which consists of a core thread 4 and an elastomer sheath 5, for example of a copolymer fluorosilicone / silicone rubber. The core thread 4 consists of stranded copper threads. In the present example, the elastomer thread 3 is processed as a weft thread of the pressure compensation fabric 6.

In der in Figur 3 dargestellten Draufsicht des erfindungsgemäßen Druckausgleichsgewebes 6 sind die nach oben verkröpften Elastomerfäden 3 im Schuss beziehungsweise die verkröpften Metallfäden 1 im Schuss und in der Kette des Presspolstergewebes zu erkennen. Die Elastomerfäden 3 weisen einen deutlich größeren Durchmesser als die Metallfäden 1 auf, wobei der Durchmesser der Elastomerfäden 3 vorteilhafterweise mindestens doppelt so groß ist, wie der der Metallfäden 1.In the plan view of the pressure compensation fabric 6 according to the invention shown in FIG. 3, the upwardly cranked elastomeric threads 3 in the weft or the cranked metal threads 1 can be seen in the weft and in the warp of the press cushion fabric. The elastomer threads 3 have a significantly larger diameter than the metal threads 1, wherein the diameter of the elastomer threads 3 is advantageously at least twice as large as that of the metal threads. 1

Die Figur 4 zeigt einen Schnitt durch das erfindungsgemäße Presspolster gemäß Figur 3, das in einer Pressenanlage zwischen einer Heizplatte 7 und einem Pressblech 8 angeordnet ist. Die Kontaktstellen des Presspolsters werden bei mäßigem Druckaufbau zunächst nur durch die Elastomerfäden 3 gebildet. Die Metallfäden 1 weisen sämtlich, auch an ihren Extremstellen ("Wellenberge") einen Abstand von der durch die Extremstellen ("Wellenberge") der Elastomerfäden 3 gebildeten Ebene auf, wodurch die Wärmeleitfähigkeit zunächst geringer ist. Erst bei weiterer Drucksteigerung bis zum Gesamtpressdruck werden weitere Kontaktstellen 9 durch die verlitzten Messingfäden 2 gebildet, so dass dann ein schnellerer Wärmefluss hergestellt ist.FIG. 4 shows a section through the press cushion according to the invention according to FIG. 3, which is arranged in a press installation between a heating plate 7 and a press plate 8. The contact points of the press pad are initially formed at moderate pressure build-up only by the elastomeric threads 3. The metal filaments 1 all, even at their extreme points ("wave crests") at a distance from the plane formed by the extreme points ("peaks") of the elastomeric filaments 3, whereby the thermal conductivity is initially lower. Only with further pressure increase up to the total pressure additional contact points 9 are formed by the stranded brass threads 2, so that then a faster heat flow is produced.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Metallfadenmetal thread
22
Messingfadenbrass thread
33
Elastomerfadenelastomer thread
44
Seelenfadencore thread
55
Elastomerummantelungelastomer coating
66
DruckausgleichsgewebePressure equalization fabric
77
Heizplatteheating plate
88th
Pressblechpress plate
99
Kontaktstellecontact point

Claims (14)

Druckausgleichsgewebe (6), insbesondere Presspolster, für den Einsatz in hydraulischen Heizpressanlagen, umfassend - Metallfäden (1), sowohl als Kettfäden als auch als Schussfäden des Presspolsters, und - hochtemperaturbeständige Elastomerfäden (3), vorzugsweise mit stabilisierenden Seelenfäden (4), die entweder als Kettfäden oder als Schussfäden alternierend mit den Metallfäden (1) angeordnet sind, dadurch gekennzeichnet, dass die Dicke im nicht komprimierten Zustand des Presspolsters von den Elastomerfäden (3) bestimmt ist und somit die Kontaktstellen des Presspolsters mit Teilen der Heizpressanlage bei mäßigem Druckaufbau zunächst durch die Elastomerfäden (3) gebildet sind, wobei die Elastomerfäden derart komprimierbar sind, dass bei weiterer Drucksteigerung bis zum Gesamtpressdruck weitere Kontaktstellen (9) durch die Metallfäden (1) gebildet sind.Pressure compensation fabric (6), in particular press pad, for use in hydraulic heating press systems, comprising - Metal threads (1), both as warp threads and as weft threads of the press pad, and high-temperature-resistant elastomeric threads (3), preferably with stabilizing core threads (4), which are arranged either as warp threads or as weft threads alternating with the metal threads (1), characterized in that the thickness in the non-compressed state of the press pad is determined by the elastomer threads (3) and thus the contact points of the press pad with parts of the Heizpressanlage at moderate pressure build-up initially by the elastomeric threads (3) are formed, wherein the elastomeric threads are compressible in such a way that further contact points (9) are formed by the metal threads (1) when the pressure is increased further up to the total pressing pressure. Druckausgleichsgewebe (6) nach Anspruch 1, dadurch gekennzeichnet, dass der Durchmesser der Elastomerfäden (3) mindestens das Doppelte des Durchmessers der Metallfäden (1) beträgt.Pressure compensation fabric (6) according to claim 1, characterized in that the diameter of the elastomeric threads (3) is at least twice the diameter of the metal threads (1). Druckausgleichsgewebe (6) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Durchmesser der Elastomerfäden (3) mindestens das Dreifache des Durchmessers der Metallfäden (1) beträgt.Pressure compensation fabric (6) according to claim 1 or 2, characterized in that the diameter of the elastomeric threads (3) is at least three times the diameter of the metal threads (1). Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Elastomerfäden (3) aus Silikonkautschuk bestehen.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the elastomeric threads (3) consist of silicone rubber. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Elastomerfäden (3) aus einem Fluorsilikonkautschuk bestehen.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the elastomeric threads (3) consist of a fluorosilicone rubber. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Elastomerfäden (3) aus einem Fluorkautschuk bestehen.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the elastomeric threads (3) consist of a fluororubber. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Elastomerfäden (3) aus einem Copolymer bestehend aus einem Anteil Fluorsilikonkautschuk und Silikonkautschuk bestehen.Pressure compensation fabric (6) according to any one of the preceding claims, characterized in that the elastomeric threads (3) consist of a copolymer consisting of a proportion of fluorosilicone rubber and silicone rubber. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Seelenfäden (4) aus Einzelfilamenten bestehen.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the core threads (4) consist of individual filaments. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Seelenfäden (4) hochtemperaturbeständig sind.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the core threads (4) are resistant to high temperatures. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Seelenfäden (4) aus Metallfäden bestehen.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the core threads (4) consist of metal threads. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Metallfäden verlitzt sind.Pressure compensation fabric (6) according to one of the preceding claims, characterized in that the metal threads are stranded. Druckausgleichsgewebe (6) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Metallfäden (1) aus Einzelfäden bestehen.Pressure compensation fabric (6) according to one of claims 1 to 10, characterized in that the metal threads (1) consist of monofilaments. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Elastomerfäden (3) in der Elastomerummantelung wärmeleitfähige Stoffe enthalten.Pressure compensation fabric (6) according to any one of the preceding claims, characterized in that the elastomeric threads (3) in the Elastomerummantelung contain thermally conductive substances. Druckausgleichsgewebe (6) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass den metallischen Kettfäden oder Schussfäden hochtemperaturbeständiges, nichtmetallisches Fadenmaterial zur Wärmesteuerung beigemischt ist.Pressure compensation fabric (6) according to any one of the preceding claims, characterized in that the metallic warp threads or weft threads high-temperature resistant, non-metallic thread material is mixed for heat control.
EP20060019667 2005-10-28 2006-09-20 Pressure equalizing fabric for hydraulic hot pressing installation Revoked EP1779999B1 (en)

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EP1300235A1 (en) * 2001-09-27 2003-04-09 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Press pad
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EP0713762A2 (en) * 1994-11-25 1996-05-29 RHEINISCHE FILZTUCHFABRIK GmbH Press pad for high and low pressure presses
DE29721495U1 (en) * 1997-12-05 1998-02-19 Thomas Josef Heimbach GmbH & Co., 52353 Düren Press pad
EP1136248A1 (en) * 2000-03-21 2001-09-26 RHEINISCHE FILZTUCHFABRIK GmbH Press pad
DE20011030U1 (en) * 2000-06-21 2001-08-02 Thomas Josef Heimbach GmbH, 52353 Düren Press pad as well as hot plate press and plate press with such press pads
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EP1386723A2 (en) * 2002-07-31 2004-02-04 RHEINISCHE FILZTUCHFABRIK GmbH Press pad

Cited By (6)

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Publication number Priority date Publication date Assignee Title
DE202010001226U1 (en) 2010-01-20 2011-05-26 Helmbach GmbH & Co. KG, 52353 press pad
EP2347894A2 (en) 2010-01-20 2011-07-27 Heimbach GmbH & Co. KG Pressure pad
EP2409829A2 (en) 2010-07-21 2012-01-25 Hueck Rheinische GmbH Pressure pad for a hydraulic press
DE102010036539A1 (en) 2010-07-21 2012-01-26 Hueck Rheinische Gmbh Press pad for a hydraulic press
DE102010036539B4 (en) * 2010-07-21 2013-04-11 Hueck Rheinische Gmbh Press pad for a hydraulic press
CN102152371A (en) * 2011-03-17 2011-08-17 薛志成 Efficient hot pressing method of bamboo particle board

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DE202005016935U1 (en) 2006-01-26
HK1104326A1 (en) 2008-01-11
ES2314800T3 (en) 2009-03-16
PL1779999T3 (en) 2009-04-30
RU2417893C2 (en) 2011-05-10
DE502006001815D1 (en) 2008-11-27
US20070099529A1 (en) 2007-05-03
CN1966794B (en) 2012-02-15
ATE411158T1 (en) 2008-10-15
RU2006137992A (en) 2008-05-10
CN1966794A (en) 2007-05-23
PT1779999E (en) 2008-12-15
EP1779999B1 (en) 2008-10-15

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