EP1779999B1 - 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
EP1779999B1
EP1779999B1 EP20060019667 EP06019667A EP1779999B1 EP 1779999 B1 EP1779999 B1 EP 1779999B1 EP 20060019667 EP20060019667 EP 20060019667 EP 06019667 A EP06019667 A EP 06019667A EP 1779999 B1 EP1779999 B1 EP 1779999B1
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EP
European Patent Office
Prior art keywords
threads
fabric
elastomer
pressure equalization
metal
Prior art date
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Revoked
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EP20060019667
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German (de)
French (fr)
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EP1779999A1 (en
Inventor
Rolf Dr. Espe
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Rheinische Filztuchfabrik GmbH
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Rheinische Filztuchfabrik GmbH
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Application filed by Rheinische Filztuchfabrik 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 compensating fabric, in particular press pad, suitable 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 are arranged with the metal filaments.
  • 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 transfer 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 yarn materials.
  • 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 cure 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.
  • a press pad for use in laminating presses with a fabric 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
  • the threads of the second group are made of rubber-elastic material or have at least a portion thereof.
  • 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.
  • the types of sutures should have a core of metal threads in order to ensure the strength of the polymer threads in the longitudinal direction.
  • 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. Especially the liquid resin phase should be extended.
  • the object is achieved in that the elastomer threads in the warp or in the weft of the pressure compensation fabric and the metal threads in the weft and in the chain of the press pad of the pressure compensation fabric are cranked, wherein the elastomeric threads have a larger diameter than the metal threads and wherein the metal threads also on their Wave crests have a distance from a plane formed by the peaks of the elastomeric threads, so that the thickness is determined in the uncompressed state of the press pad of the elastomeric 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%.
  • the method initially mentioned is achieved by a method for pressing a pressed material in a hydraulic Thompsonpressstrom with a hot plate, a pressure plate and a pressure equalization fabric arranged therebetween, in particular one of the above-described press pad, in which in a first step, a moderate pressure is built up, so in that the contact points of the press pad with the heating plate and the press plate are formed by elastomer threads of the pressure compensation fabric and in a second step an increase in pressure up to a total pressure, wherein the Elastormerfäden be compressed so that further contact points are formed by metal threads of the pressure compensation fabric.
  • FIG. 1 shows a metallic strand of individual stranded brass threads 2, this metal thread 1 is processed both as a warp and as a weft thread of a pressure compensation fabric 6.
  • an elastomer thread 3 is shown, 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.
  • FIG. 3 shown top view of the pressure compensation fabric 6 according to the invention are the upwardly cranked elastomeric threads 3 in the shot or the cranked metal threads 1 in the weft and in the chain of Presspolstergewebes to recognize.
  • 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 pad according to the invention according to FIG. 3 , which is arranged in a press plant 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.

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

Die Erfindung betrifft ein Druckausgleichsgewebe, insbesondere Presspolster, geeignet 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 compensating fabric, in particular press pad, suitable 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 are arranged with the metal filaments.

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 transfer 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 Garnmaterialien 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 yarn materials. 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 cure 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.

Ferner 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.Furthermore, 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.

In der EP 1 386 723 A2 ist ein Presspolster gemäß der Oberbegriff des Anspruchs 1 beschrieben, dessen Fadenarten jeweils Polymermaterial enthalten, wobei die Fadenarten jeweils quer zu ihrer Achse unterschiedliche Elastizitäten aufweisen sollen. Dabei sollen die Fadenarten in einer bevorzugten Ausführungsform eine Seele aus Metallfäden besitzen, um die Festigkeit der Polymerfäden in Längsrichtung zu gewährleisten.In the EP 1 386 723 A2 is a press pad according to the preamble of claim 1 described, the yarn types each containing polymer material, wherein the types of yarn should each have transverse to its axis different elasticities. In this case, in a preferred embodiment, the types of sutures should have a core of metal threads in order to ensure the strength of the polymer threads in the longitudinal direction.

Schließlich geht aus der DE 200 11 030 U1 ein Presspolster hervor, das in seinem Fadensystem Heizdrähte zur aktiven Erhitzung des Presspolsters besitzt, die webtechnisch in die Struktur des Presspolsters integriert sind.Finally, leave the DE 200 11 030 U1 a press pad, which has heating wires in its thread system for the active heating of the press pad, which are integrated into the structure of the press pad Webtechnisch.

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.Especially for the highly sensitive HDF board coating (High Density Fiberboard) with melamine resin overlay and Al 2 O 3 filling and a melamine resin decor film for Production of floor panels, extremely high demands are placed on the press pad, so that it comes to an unadapted heat transfer from hot plate to press plate to surface defects of the condensed melamine resins. 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. Darüber hinaus ist es Aufgabe der Erfindung ein Verfahren zum Pressen eines Pressgutes bereitzustellen, mit dem die vorgenannten Aufgaben erzielbar sind.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. Especially the liquid resin phase should be extended. In addition, it is an object of the invention to provide a method for pressing a pressed material, with which the aforementioned objects can be achieved.

Lösungsolution

Die Aufgabe wird dadurch gelöst, dass die Elastomerfäden in der Kette oder im Schuss des Druckausgleichsgewebes und die Metallfäden im Schuss und in der Kette des Presspolsters des Druckausgleichsgewebes verkröpft sind, wobei die Elastomerfäden einen größeren Durchmesser aufweisen als die Metallfäden und wobei die Metallfäden auch an ihren Wellenbergen einen Abstand von einer durch die Wellenberge der Elastomerfäden gebildeten Ebene aufweisen, so dass die Dicke im nicht komprimierten Zustand des Presspolsters von den Elastomerfäden bestimmt ist.The object is achieved in that the elastomer threads in the warp or in the weft of the pressure compensation fabric and the metal threads in the weft and in the chain of the press pad of the pressure compensation fabric are cranked, wherein the elastomeric threads have a larger diameter than the metal threads and wherein the metal threads also on their Wave crests have a distance from a plane formed by the peaks of the elastomeric threads, so that the thickness is determined in the uncompressed state of the press pad of the elastomeric 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 Vernetzungsgrades 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%.

Verfahrensmäßig wird die eingangs erwähnte Aufgabe durch ein Verfahren zum Pressen eines Pressgutes in einer hydraulischen Heizpressanlage mit einer Heizplatte, einem Pressblech und einem dazwischen angeordneten Druckausgleichsgewebe, insbesondere eines der vorbeschriebenen Presspolster, gelöst, bei dem in einem ersten Schritt ein mäßiger Druck aufgebaut wird, so dass die Kontaktstellen des Presspolsters mit der Heizplatte und dem Pressblech durch Elastomerfäden des Druckausgleichsgewebes gebildet werden und in einem zweiten Schritt eine Drucksteigerung bis zu einem Gesamtpressdruck erfolgt, wobei die Elastormerfäden derart komprimiert werden, dass weitere Kontaktstellen durch Metallfäden des Druckausgleichsgewebes gebildet werden.The method initially mentioned is achieved by a method for pressing a pressed material in a hydraulic Heizpressanlage with a hot plate, a pressure plate and a pressure equalization fabric arranged therebetween, in particular one of the above-described press pad, in which in a first step, a moderate pressure is built up, so in that the contact points of the press pad with the heating plate and the press plate are formed by elastomer threads of the pressure compensation fabric and in a second step an increase in pressure up to a total pressure, wherein the Elastormerfäden be compressed so that further contact points are formed by metal threads of the pressure compensation fabric.

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 FIG. 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.The FIG. 1 shows a metallic strand of individual stranded brass threads 2, this metal thread 1 is processed both as a warp 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.In FIG. 2 an elastomer thread 3 is shown, 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 in FIG. 3 shown top view of the pressure compensation fabric 6 according to the invention are the upwardly cranked elastomeric threads 3 in the shot or the cranked metal threads 1 in the weft and in the chain of Presspolstergewebes to recognize. 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.The FIG. 4 shows a section through the press pad according to the invention according to FIG. 3 , which is arranged in a press plant 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 (15)

  1. A pressure equalization fabric (6), particularly a pressing cushion, suitable for use in hydraulic hot pressing facilities, comprising
    - metal threads (1), both as warp threads and also as weft threads of the pressing cushion, and
    - high-temperature-resistant elastomer threads (3), preferably having stabilizing core threads (4), which are situated alternating with the metal threads (1) either as warp threads or as weft threads,
    characterized in that the elastomer threads (3) in the warp or in the weft of the pressure equalization fabric (6) and the metal threads (1) in the weft and in the warp of the pressing cushion of the pressure equalization fabric (6) are bent at right angles, the elastomer threads (3) having a greater diameter than the metal threads (1) and the metal threads (1) also having a spacing at the wave peaks to a plane formed by the wave peaks of the elastomer threads (3), so that the thickness in the uncompressed state of the pressing cushion is determined by the elastomer threads (3).
  2. The pressure equalization fabric (6) according to Claim 1, characterized in that the diameter of the elastomer threads (3) is at least twice the diameter of the metal threads (1).
  3. The pressure equalization fabric (6) according to Claim 1 or 2, characterized in that the diameter of the elastomer threads (3) is at least three times the diameter of the metal threads (1).
  4. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the elastomer threads (3) comprise silicone rubber.
  5. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the elastomer threads (3) comprise a fluorinated silicone rubber.
  6. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the elastomer threads (3) comprise a fluorinated rubber.
  7. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the elastomer threads (3) comprise a copolymer comprising a component of fluorinated silicone rubber and silicone rubber.
  8. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the core threads (4) comprise single filaments.
  9. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the core threads (4) are resistant to high temperatures.
  10. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the core threads (4) comprise metal threads.
  11. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the metal threads are stranded.
  12. The pressure equalization fabric (6) according to one of Claims 1 through 10, characterized in that the metal threads (1) comprise single threads.
  13. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that the elastomer threads (3) contain thermally-conductive materials in the elastomer sheath.
  14. The pressure equalization fabric (6) according to one of the preceding claims, characterized in that a high-temperature-resistant, nonmetallic thread material is admixed to the metallic warp threads or weft threads for heat control.
  15. A method for pressing a pressing product in a hydraulic hot pressing facility having a heating plate (7), a pressing sheet (8), and a pressure equalization fabric (6), in particular a pressing cushion, situated between them, according to one of Claims 1 through 14, characterized in that a moderate pressure is built up in a first step, so that the contact points of the pressing cushion with the heating plate (7) and the pressing sheet (8) are formed by elastomer threads (3) of the pressure equalization fabric (6), and a pressure increase up to a total pressing pressure occurs in a second step, the elastomer threads (3) being compressed in such a way that further contact points (9) are formed by metal threads (1) of the pressure equalization fabric (6).
EP20060019667 2005-10-28 2006-09-20 Pressure equalizing fabric for hydraulic hot pressing installation Revoked EP1779999B1 (en)

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CN (1) CN1966794B (en)
AT (1) ATE411158T1 (en)
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ES (1) ES2314800T3 (en)
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DE20115945U1 (en) * 2001-09-27 2001-12-13 Heimbach Gmbh Thomas Josef Press pad
ES2238372T3 (en) * 2001-09-27 2005-09-01 THOMAS JOSEF HEIMBACH GESELLSCHAFT MIT BESCHRANKTER HAFTUNG & CO. PRESS PAD.
ES2311079T3 (en) * 2002-07-31 2009-02-01 Rheinische Filztuchfabrik Gmbh PRESSURE PAD.

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RU2006137992A (en) 2008-05-10
RU2417893C2 (en) 2011-05-10
EP1779999A1 (en) 2007-05-02
DE502006001815D1 (en) 2008-11-27
PT1779999E (en) 2008-12-15
DE202005016935U1 (en) 2006-01-26
HK1104326A1 (en) 2008-01-11
ATE411158T1 (en) 2008-10-15
CN1966794A (en) 2007-05-23
ES2314800T3 (en) 2009-03-16
PL1779999T3 (en) 2009-04-30
US20070099529A1 (en) 2007-05-03
CN1966794B (en) 2012-02-15

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