EP2347894B1 - Presspolster - Google Patents

Presspolster Download PDF

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Publication number
EP2347894B1
EP2347894B1 EP10192484.3A EP10192484A EP2347894B1 EP 2347894 B1 EP2347894 B1 EP 2347894B1 EP 10192484 A EP10192484 A EP 10192484A EP 2347894 B1 EP2347894 B1 EP 2347894B1
Authority
EP
European Patent Office
Prior art keywords
threads
layer
heat
pressure pad
conducting
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.)
Active
Application number
EP10192484.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2347894A2 (de
EP2347894A3 (de
Inventor
Walther Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heimbach GmbH and Co KG
Original Assignee
Heimbach GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Heimbach GmbH and Co KG filed Critical Heimbach GmbH and Co KG
Priority to PL10192484T priority Critical patent/PL2347894T3/pl
Publication of EP2347894A2 publication Critical patent/EP2347894A2/de
Publication of EP2347894A3 publication Critical patent/EP2347894A3/de
Application granted granted Critical
Publication of EP2347894B1 publication Critical patent/EP2347894B1/de
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Anticipated expiration legal-status Critical

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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

Definitions

  • the invention relates to a press pad for presses for the production of laminated plates according to the preamble of claim 1.
  • laminated panels for example decorative coated chipboard
  • laminating presses which can be designed as low or high-pressure floor presses or short-cycle presses.
  • press pads are inserted into the press between the heated press plates and the press plate, which have the task on the one hand to transfer the pressure over the entire surface and evenly on the pressed material and on the other hand transfer the outgoing heat from the press plates quickly and without great losses to the pressed material.
  • the press pads must be able to withstand high pressures and the temperatures present in such presses. To avoid heat loss, the press pads should have a high thermal conductivity in the thickness direction.
  • press pads are known in which a carrier consisting of a metal fabric is coated with a silicone elastomer in such a way that the silicone elastomer forms a matrix for the metal fabric (cf. DE 23 19 563 B ; DE 100 34 374 A1 ).
  • a metal fabric comes as a carrier and a random fiber fleece in question (see. DE 26 27 442 A1 ).
  • the proposal has been made to provide a fabric of aromatic polyamide threads and metal threads at least on one side only superficially with a coating in the form of a continuous layer, which consists of an elastomeric material, in particular silicone elastomer (see. DE 200 11 432 U1 ).
  • press pad made of a multi-ply fabric impregnated with a heat-resistant resin to stabilize the fabric structure and improve surface smoothness.
  • a press pad made of a multi-ply fabric impregnated with a heat-resistant resin to stabilize the fabric structure and improve surface smoothness.
  • Another variant of this type of press pads is in the DE 23 38 749 A disclosed.
  • This press pad is a glass fiber fabric as a carrier.
  • the warp and weft threads are coated with a plastic, for example silicone rubber.
  • the entire fabric may be coated with a plastic, wherein also here silicone rubber is proposed.
  • the aforementioned press pads have just because of the coating with silicone or resin unsatisfactory thermal conductivity in the thickness direction, ie perpendicular to the plane of the press pad.
  • the proposal has been made to equip the carrier with plantetfäden, in particular metal filaments and to provide this carrier with a cushion layer whose thickness is less than that of the carrier, wherein the cushion layer is embedded in the carrier so that the heat conducting threads project on both outer sides of the press pad over the cushion layer.
  • a press pad is proposed in which the fabric is coated with a fluorine and / or a silicone fluoroelastomer.
  • this type of press pads so dispensed with a coating.
  • Variants of such press pads can be the EP 0 713 762 A2 .
  • EP 0 920 983 A1 and EP 1 779 999 A1 remove.
  • the upholstery threads usually form the weft threads, while the warp threads metal threads are used to assist the heat transfer.
  • the carrier formed as a fabric is impregnated with graphite particles (WO 2004/096534 A1
  • graphite particles WO 2004/096534 A1
  • the graphite particles are incorporated in a binder, wherein the outside may be provided with an additional binder layer.
  • press pads which relate their cushioning properties solely by the padding threads of an elastomer or with an elastomer sheathing of a core thread, although have good cushioning properties and when using between the flat sides of the press pad reciprocating choirleitfäden also good heat transfer properties.
  • their dimensional stability is not optimal, even if the carrier fabric is woven so tightly that the sauceleitfäden dig into the rubber-elastic material of the upholstery threads (see. EP 0 920 983 A1 ). It also comes with the pressures in the press
  • Such press pads to dimensional changes in the plane in the form of cuts in the longitudinal and transverse directions, which do not reset or only inadequate after pressure relief. This limits the life of such press pads and occurs especially with frequent format changes of the material to be pressed.
  • the invention is therefore based on the object Press-cushion of the type mentioned, ie those whose cushioning properties is caused solely by the upholstery threads, to improve the dimensional stability and in particular to reduce the tendency to shorten or eliminate.
  • the basic idea of the invention is thus to store an additional rubber-elastic element in the form of a layer in the support of the press pad despite its actually sufficient cushioning property, in such a way that a connection between the coating of the upholstery threads and the layer of rubber-elastic material is produced.
  • the preparation of the layer can be done by doctoring the liquid to pasty coating material in the previously prepared carrier from one or both sides. It has been found that the additional layer due to its rubber-elastic property for effective recovery of the deformed during the pressing process press pad in Plane direction, ie the dimensional stability is improved significantly and with long-term effect.
  • the service life of the press pad increases significantly as a result, and the press pad can be used more universally, especially with frequent format changes in production.
  • the threads form gaps between them, which are filled by the layer. This gap filling makes the restoring effect of this layer particularly effective.
  • the threads ie both the upholstery and the heat conducting threads
  • the layer can also be used to provide on at least one side, preferably the side facing the pressed material in the application of the press pad, for the formation of a smooth surface, by applying the layer so that the threads on this side do not protrude beyond the outside of the layer.
  • the heat conduction takes place just below the surface, so that the thin layer has little insulating effect. This reduction of the heat conduction can be taken into account by incorporating heat-conducting particles into the layer and / or the coating of the upholstery threads, as will be discussed below which promote the heat transfer through the layer up to the politiciansleitfäden.
  • the rubber-elastic layer may be symmetrical to a median plane of the carrier, wherein the median plane extends perpendicular to the thickness of the press pad and in the thickness center.
  • a symmetrical arrangement is achieved in particular when the material for the production of the layer is doctored from both sides.
  • the layer lies more than 50% of its thickness on one side of the mid-plane of the carrier, that is to say with regard to the thickness of the layer asymmetrically with respect to the mid-plane. The latter arrangement is achieved in particular when the material for the production of the layer is only scanned on one side.
  • the hardness of the coating of the upholstery threads As for the hardness of the coating of the upholstery threads, a value of 50 to 90, preferably 60 to 75 Shore A hardness, has proven to be useful.
  • the rubber-elastic layer should also have a hardness that lies within this range. In this case, the hardness of the layer may be greater than that of the coating of the upholstery threads, in particular good recovery properties to realize. The difference should be at least 10 Shore A hardness.
  • the threads of the carrier should form a preferably single-layered fabric, wherein in particular a plain weave is offered because of the favorable course of the heat-conducting threads. This does not exclude that other weaves and also multi-layered fabrics can be considered, for example in the form of spacer fabrics.
  • the heat conducting fibers should enclose the upholstery threads in cranks, if possible so that the heat conducting fibers dig into the upholstery threads to prevent slippage of the heat conduction with respect to the upholstery threads.
  • the upholstery threads then run essentially straight.
  • the distribution of the cranks of the tillleitfäden is as even as possible.
  • the number of offsets of the thermal conductors should be on each side of the fabric between 10 to 40, preferably 15 to 30 per cm 2 .
  • the high density of the cranks ensures good and even heat transfer over the surface.
  • the condition is that thermal conductors form on the outer sides of the press pad 10 to 40, preferably 15 to 30 contact points per cm 2 .
  • the thread density of the cushioning threads is so large that the heat conducting threads only pass through compression of the rubber-elastic material of the cushioning threads between them, in particular the distance between the cushioning threads is less than the average diameter of the heat conducting threads.
  • the distance should be at least 10% less than the diameter of theticianleitfäden.
  • the heat conducting threads do not protrude beyond the plane formed by the outermost points of the upholstery threads, better still have a distance to this plane.
  • This design has the advantage that the heat conducting threads are protected against abrasion when handling the press pad. Only when subjected to compressive stress in the press, the thermal conductors get in contact with the adjacent surfaces of the heated pressure plate and the press plate and then ensure good heat conduction.
  • silicone elastomers are suitable both in the coating of the upholstery threads and in the additional layer, since they are able to withstand the temperatures in the presses without loss of elasticity.
  • fluoroelastomers or fluorosilicone elastomers are also suitable.
  • such metal materials should be used, which have a high thermal conductivity.
  • copper or copper alloys and combinations of copper and plastic threads eg aramid threads
  • copper it is also possible to use brass, aluminum, silver and / or alloys of these materials as well as carbon and combinations of metal and carbon.
  • the heat conductivity of the press pad in the thickness direction can be optimally adapted to the respective requirements.
  • the politiciansleitteilchen particular as powder and / or fibers of metal and / or carbon and / or as Carbonanotubes (CNT), in particular multiwall Carbonanotubes (MWCNT) may be formed.
  • CNT Carbonanotubes
  • MWCNT multiwall Carbonanotubes
  • the cherriesleitfäden may consist entirely of the metal used in each case. But they can also be formed so that a core thread is provided of a plastic, such as aramid, which is wrapped by at least one wire or ribbon, or are stranded around the wires or ribbons, which consist of a material whose specific thermal conductivity is greater is as the soul thread, for example, one of the aforementioned metals.
  • a plastic such as aramid
  • Such thermal conductors are for example also made DE 297 21 494 U1 known.
  • the core threads of the upholstery threads are each formed of a core thread and these surrounding wires or ribbons, which consist of a material whose specific thermal conductivity is greater than that of the core thread.
  • these surrounding wires or ribbons which consist of a material whose specific thermal conductivity is greater than that of the core thread.
  • the core threads and / or theticianleitfäden may be formed by their structure as threads, braids, knitting threads, multifilaments or strands.
  • the rubber-elastic material of coating and / or layer should additionally have at least one heat stabilizer.
  • heat stabilizers are the EP 0 189 899 A2 refer to.
  • antioxidants come into question.
  • the layer has passage channels which are open towards the outer sides of the press pad, so that the press pad is permeable to air in the thickness direction at these points.
  • the layer may also be provided with dyes to achieve a desired mark.
  • FIGS. 1 to 5 show as carrier 1 a single-layer fabric 1 in plain weave.
  • the fabric has heat-conducting threads - exemplified by 3 - forming warp threads and upholstery threads - exemplified by 4 - forming weft threads.
  • the upholstery threads 4 run substantially stretched, ie they are not pressed out substantially by the integration with the thermal conduction 3 from the tissue plane. As can be seen in particular from the FIGS.
  • a heat conduction 3 is shown in detail. It comprises a twisted core thread 9 of aramid around which the six metal wires - designated by way of example by 10 - are struck in a stranding manner, such that the core thread 9 is completely enveloped by the metal wires 10. This results in a very closed and relatively smooth surface of the sautfadens 3, which ensures good contact with the press plates and the press plate.
  • the heat conduction thread 3 has a diameter of about 0.4 to 0.5 mm.
  • the in FIG. 7 shown enlarged padding thread 4 has a core thread 11 of about 0.6 mm in diameter, which consists of a core thread 12 of aramid and six metal wires - exemplified by 13 - which are stranded around the core thread 12.
  • the metal wire 13 is made of copper.
  • the core thread 11 is surrounded by an extruded elastomer sheath 14 made of a silicone elastomer.
  • the diameter of the cushioning thread 4 is about 1.5 mm.
  • the heat conducting 3 dig into the elastic material of the elastomer sheathing 14 of the cushioning threads 4 a.
  • This not only has the advantage that the thermal conductors 3 can not shift in the direction of the longitudinal axes of the cushioning threads 4, but force the thermal conductors 3 to form steeply extending and thus short intermediate sections 7.
  • the heat conducting filaments 3 dig so strongly into the material of the elastomer coating 14 of the upholstery threads 4 that they do not protrude beyond the level 15 formed by the outer points of the upholstery threads 4 in the non-compressed state, but even distance therefrom have this level 15. Only under compression they get in contact with the heated press plates or the press plate.
  • FIGS. 2 to 5 show various embodiments of press pads 16, 17, 18, 19, which have the same carrier 1, which is why for the parts of which for the FIGS. 1 as well as 6 and 7 reference numerals used for these figures.
  • the press pads 16, 17, 18, 19 differ only in that in the carriers 1 different elastomeric layers 20, 21, 22, 23 are embedded.
  • the elastomeric layer 20 is unilaterally scribed into the fabric from above, in such a way that the top offsets are also covered with elastomeric material of the layer 20, ie they do not protrude outward beyond the layer 20.
  • the fabric has been coated on both sides so that the resulting elastomeric layer 21 completely encloses the fabric, in contrast to FIG. 2 So also forms the bottom and covers the local cranks 6 there.
  • the additional elastomeric layer 20, 21, 22, 23 respectively forms buffer between the cushioning threads 4 in the plane direction and, after a pressing operation, provides for a return of the press pad 16, 17, 18, 19 in the plane direction.
  • the layers 20, 21, 22, 23 thus ensure good and long-lasting dimensional stability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Woven Fabrics (AREA)
EP10192484.3A 2010-01-20 2010-11-25 Presspolster Active EP2347894B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10192484T PL2347894T3 (pl) 2010-01-20 2010-11-25 Poduszka dociskowa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202010001226U DE202010001226U1 (de) 2010-01-20 2010-01-20 Presspolster

Publications (3)

Publication Number Publication Date
EP2347894A2 EP2347894A2 (de) 2011-07-27
EP2347894A3 EP2347894A3 (de) 2013-05-08
EP2347894B1 true EP2347894B1 (de) 2014-05-07

Family

ID=43797910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10192484.3A Active EP2347894B1 (de) 2010-01-20 2010-11-25 Presspolster

Country Status (3)

Country Link
EP (1) EP2347894B1 (pl)
DE (1) DE202010001226U1 (pl)
PL (1) PL2347894T3 (pl)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012005265U1 (de) * 2012-05-26 2012-06-27 Rolf Espe Presspolster für Ein- und Mehretagenheizpressen mit wärmeleitenden Kontaktschlussfäden in Kett- und/oder Schussrichtung
DE102019115974A1 (de) * 2019-06-12 2020-12-17 Hueck Rheinische Gmbh Verfahren zur Herstellung eines Presspolsters sowie Pressblechset
DE202022002690U1 (de) * 2022-12-30 2024-01-04 Hueck Rheinische Gmbh Presspolster universal einsetzbar und Fixierung desselben in hydraulischen Mehretagenpressen mit Aufheizung und Rückkühlung

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319563A1 (de) 1972-04-21 1973-10-25 Heinz Lochmann Scheibenbremse
DE2319593B2 (de) * 1973-04-18 1976-09-23 Becker & van Hüllen Niederrheinische Maschinenfabrik, 4150 Krefeld Presspolster fuer heizplattenpressen
DE2338749A1 (de) 1973-07-31 1975-02-13 Becker & Van Huellen Flexible transport- und pressunterlage zur herstellung von holzwerkstoffplatten
DE2627442A1 (de) 1976-06-18 1977-12-29 Becker & Van Huellen Presspolster fuer heizplattenpressen
JPS61174270A (ja) 1985-01-29 1986-08-05 Kyowa Chem Ind Co Ltd 耐発錆性ないし耐着色性賦与剤
JPH0817880B2 (ja) 1990-11-28 1996-02-28 帝人株式会社 プレスクッション材
GB9421573D0 (en) 1994-10-26 1994-12-14 Marathon Belting Ltd A press pad
DE9418984U1 (de) 1994-11-25 1995-01-26 Rheinische Filztuchfabrik GmbH, 52222 Stolberg Preßpolster für Hoch- und Niederdruckpressen
DE29704258U1 (de) 1997-03-08 1997-06-05 Rheinische Filztuchfabrik GmbH, 52222 Stolberg Druckausgleichspolster für Heiz- und Rückkühlpressen
DE29721494U1 (de) 1997-12-05 1998-02-19 Thomas Josef Heimbach GmbH & Co., 52353 Düren Preßpolster
DE29721495U1 (de) 1997-12-05 1998-02-19 Thomas Josef Heimbach GmbH & Co., 52353 Düren Preßpolster
US6737370B2 (en) 2000-03-21 2004-05-18 Rheinische Filztuchfabrik Gmbh Press pad containing fluoroelastomer or fluorosilicone elastomer priority claim
DE20011432U1 (de) 2000-07-05 2000-10-26 Rheinische Filztuchfabrik GmbH, 52222 Stolberg Preßpolster
DE10034374A1 (de) 2000-07-14 2002-01-31 Eumuco Maschinenfabrik Gmbh Preßpolster hoher Wärmeleitfähigkeit
PT1300235E (pt) 2001-09-27 2005-06-30 Heimbach Gmbh Thomas Josef Almofada de pressao
WO2004096534A1 (en) * 2003-04-30 2004-11-11 Marathon Belting Limited Improvements to press pads
DE202005016935U1 (de) 2005-10-28 2006-01-26 Espe, Rolf Druckausgleichsgewebe für hydraulische Heizpressenanlagen

Also Published As

Publication number Publication date
PL2347894T3 (pl) 2014-10-31
DE202010001226U1 (de) 2011-05-26
EP2347894A2 (de) 2011-07-27
EP2347894A3 (de) 2013-05-08

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