EP0920983B1 - Coussinet pour presse - Google Patents

Coussinet pour presse Download PDF

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Publication number
EP0920983B1
EP0920983B1 EP98120719A EP98120719A EP0920983B1 EP 0920983 B1 EP0920983 B1 EP 0920983B1 EP 98120719 A EP98120719 A EP 98120719A EP 98120719 A EP98120719 A EP 98120719A EP 0920983 B1 EP0920983 B1 EP 0920983B1
Authority
EP
European Patent Office
Prior art keywords
group
press pad
pad according
yarns
threads
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.)
Expired - Lifetime
Application number
EP98120719A
Other languages
German (de)
English (en)
Other versions
EP0920983A1 (fr
Inventor
Walter Halterbeck
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
Thomas Josef Heimbach and Co GmbH
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 Thomas Josef Heimbach and Co GmbH filed Critical Thomas Josef Heimbach and Co GmbH
Publication of EP0920983A1 publication Critical patent/EP0920983A1/fr
Application granted granted Critical
Publication of EP0920983B1 publication Critical patent/EP0920983B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 use in laminating presses with a fabric which has a first group of parallel threads and a second group of parallel threads crossing the threads of the first group, the threads of the first group being made of metal or having a metal content, and wherein the threads of the second group consist of or have a proportion of rubber-elastic material, and wherein the threads of the first group crank around the threads of the second group.
  • layer materials for example decorative chipboard coatings
  • laminating presses which can be designed as low or high pressure floor presses or short cycle presses.
  • Press pads are used which have the task of transferring the pressure over the entire surface and evenly to the material to be pressed.
  • the press pads must be able to withstand high pressures and also the temperatures present in such presses, and they must be able to transfer the heat emanating from the press plates to the material to be pressed quickly and without major losses, i.e. to have a high thermal conductivity in this direction.
  • Press cushions are known in the prior art which consist of a fabric which comprises two types of threads (EP 0 493 630 A1).
  • the threads are made of metal or have a metal component in order to improve the heat transfer to the material to be pressed.
  • Various proposals are made for the second group of threads, for example threads made of aromatic polyamide (EP 0 493 630 A1), made of silicone elastomer (DE 295 18 204 U1) or made of rubber, heat-resistant plastic monofilament or the like (EP 0 713 762).
  • the invention is therefore primarily based on the task of creating a press cushion with better thermal conductivity. Another task is to improve dimensional stability and to provide a smooth surface.
  • the thread density of the threads of the second group is so great that the threads of the first group pass between them only with compression of the rubber-elastic material of the threads of the second group.
  • the free distance between the threads of the second group in the undeformed state, ie without compression of the rubber-elastic material is less, preferably at least 10% less than the thickness extension of the threads of the first group in one plane, which goes through the longitudinal axis of these threads and extends perpendicular to the plane of the press cushion.
  • the basic idea of the invention is therefore to have a positive influence on the heat transfer by means of a special fabric geometry with a very high thread density in the threads of the second group.
  • the improved heat transfer is achieved in that the threads of the first group are forced to pass very steeply between these threads due to the small distance between the threads of the second group. This results in short heat paths between the two surfaces of the press pad, with the result that the pressing of the material to be heated takes place much faster. This means that much shorter cycle times can be achieved and energy consumption is also lower due to the lower temperature difference.
  • the threads of the first group dig into those of the second group with elastic compression of the rubber-elastic material of these threads, with the result that the threads do not slip against each other.
  • the processing of the fabric, that is the internal wear is kept comparatively low.
  • the dimensional stability in the direction of the threads of the first group is much better, even if the copper material which tends to shrink due to the formation of loops is used as the metal material.
  • the thermal conductivity of which is only a third of that of copper and the material price is significantly higher than that of copper. Since copper can be used on the basis of the fabric structure according to the invention, the thermal conductivity also increases considerably as a result, and this at significantly lower costs.
  • the threads are interwoven in such a way that the threads of the first group do not protrude beyond the plane formed by the outermost points of the threads of the second group, and are even better at a distance from this plane.
  • This design has the advantage that the threads of the first group are protected against abrasion when handling the press cushion.
  • the threads of the first group (metal threads) only come into contact with the adjacent surfaces of the press and the material to be pressed and then ensure good heat conduction when the laminating press is subjected to pressure.
  • the thread density of the threads of the first group is so high that the area coverage is between 50 and 80%, preferably between 60 and 70%. This high thread density also promotes the thermal conductivity and thus the rapid heating of the pressed material.
  • the threads have a weave with an even distribution of the cranks of the threads of the first group.
  • the number of cranks of the threads of the first group should be on each side of the fabric are between 20 and 30 per cm 2 . This high density of the cranks also ensures good heat transfer across the surface.
  • the rubber-elastic material has a Shore A hardness of 60 to 75. This hardness favors the storage of the threads of the first group and thus a firm tissue bond. In addition, the residual compressibility with this hardness is maintained for a long time.
  • All materials which have rubber-elastic properties and which are able to withstand the temperatures in the presses are suitable for the rubber-elastic material. Silicone elastomers are particularly suitable. A foamed rubber-elastic material is recommended, preferably with a specific weight of 0.3 to 0.5 g / cm 3 .
  • such metal materials should be used that have a high thermal conductivity.
  • copper or strength-modified copper alloys are particularly suitable for this. Due to the firm weave, the tendency of copper threads to shrink is counteracted, so that despite the use of this problematic material, no significant shrinkage could be determined. In this way, the high thermal conductivity and the low price of this material can be used for the press pad according to the invention.
  • the use of non-annealed copper (hard copper) is particularly advantageous because it has a high strength. Annealed copper (soft copper) is also an option.
  • threads of the first group have a plastic core thread, which is surrounded by at least one metal wire, and preferably in such a way that the plastic core thread is completely covered by the metal wire or wires.
  • the cover is preferably done by wrapping at least one metal wire, expediently a plurality of metal wires one above the other, or by stranding metal wires.
  • the stranding or wrapping of the metal wire or wires creates, in contrast to twisting, an almost circular thread, which forms a larger contact surface on the top and bottom of the press pad and thus good heat transfer from the press plates to the material to be pressed is achieved.
  • Heat-resistant plastics for example aramids, or monofilaments made of PPS, PEK, PEEK or the like or glass fiber threads are suitable for the plastic core thread.
  • the invention further provides that threads of the second group are surrounded on the outside with at least one metal wire, and preferably here also such that the threads of the second group are completely covered on the outside with the metal wire or wires.
  • This has the advantage that the threads of the second group also transfer heat promote, but do not lose their cushioning properties due to the proportion of rubber-elastic material.
  • the threads of the second group are also preferably wrapped here by stranding or wrapping.
  • the threads of the second group can consist entirely of rubber-elastic material, for example a silicone elastomer. However, better strength is achieved if these threads have a core thread which is surrounded by an extruded shell made of rubber-elastic material.
  • the core thread can have a central thread, for example made of aramid, glass fibers, metal, etc., around which the metal wires are stranded or wound.
  • the stranded metal wires should be partially S-shaped and partially Z-shaped, this advantageously being done alternately. This effectively prevents the press cushion from "wandering" in the press.
  • the threads of the second group should have a diameter of at least 1 mm, preferably of at least 1.5 mm. They then remain essentially stretched within the fabric and, together with their high thread density in relation to the thickness of the threads of the first group, promote a pronounced cranking of these threads.
  • the threads of the first group should have a diameter of at least 0.15 mm, which can go to 0.3 mm.
  • the press pad 1 shown in FIGS. 1 and 2 is designed as a single-layer fabric 2 with longitudinal threads extending in the warp direction - denoted by 3 for example - and transverse threads extending in the weft direction - denoted by 4, for example.
  • the transverse threads 4 are essentially stretched, i.e. they are not significantly pushed out of the press cushion plane by the integration with the longitudinal threads 3, while the longitudinal threads 3 wrap around the transverse threads 4 and thereby form pronounced offsets on the top and bottom, for example, designated 5, 6, which develop during operation under the action of pressure flatten and which are connected between the transverse threads 4 by intermediate sections - designated 7 by way of example. This results in a meandering course of the longitudinal threads 3.
  • a longitudinal thread 3 is shown in more detail in FIG. It has a twisted core thread 8 made of aramid, around which six metal wires - designated 9 by way of example - are twisted according to the type of stranding, in such a way that the core thread 8 is completely enveloped by the metal wires 9. This results in a very closed and relatively smooth surface of the longitudinal thread 3, which ensures good contact with the press plates and the material to be pressed.
  • the longitudinal thread 3 has a diameter of 0.2 mm.
  • the cross thread 4 shown enlarged in FIG. 4 has a core thread 10 of 0.2 mm diameter, which consists of a central thread 11 made of aramid and six metal wires — designated 12, for example — the metal wires 12 being stranded around the central thread 11.
  • the metal wire 12 consists of non-annealed copper (hard copper), whereby a high strength is achieved.
  • the core thread 10 is surrounded by an extruded-on elastomer sleeve 13 made of a silicone elastomer. This results in a diameter for the transverse threads 4 of 1.5 mm.
  • the thread density of the transverse threads 4 is such that the distance between the transverse threads 4 without woven-in longitudinal threads 3, that is to say in the undeformed state, is less than their diameter, that is to say less than 0.2 mm.
  • the longitudinal threads 3 thus dig into the elastic material of the elastomer sleeve 13 of the transverse threads 4. This not only has the advantage that the longitudinal threads 3 cannot shift in the direction of the longitudinal axes of the transverse threads 4, but rather force the longitudinal threads 3 to form steep intermediate sections 7.
  • Figure 6 shows a transverse thread 15 for a press pad, not shown here.
  • the cross thread 15 is suitable to also be used in the press pad 1 according to FIGS. 1 and 2. It has an elastomer core 16 made of a silicone elastomer, which - which is not shown in more detail here - surrounds a core thread which is constructed in the same way as in the cross thread 4.
  • Metal wires - designated 17 by way of example - are stranded around the elastomer core 16. After completion of the stranding process, the entire area of the elastomer core 16 is surrounded by the metal wires 17, which thus form a gapless metal sheath.
  • the cross thread 15 is therefore suitable for improving the heat transfer through a press pad manufactured with it, be it as the only metal threads, be it in addition to metal longitudinal threads, or be that the longitudinal threads are also formed in the same way as the transverse threads 15.
  • FIG. 7 shows a transverse thread 18 which can be used as a replacement for or in combination with the transverse thread 15 according to FIG. 6 in a press cushion. It also has an elastomer core 19 made of a silicone elastomer, which — which is not shown in more detail here — surrounds a core thread that is constructed in the same way as in the cross thread 4.
  • a metal wire 20 is wound around the elastomer core 19, specifically in such a way that it surrounds the elastomer core 19 over the entire area and thus a gapless metal sheath is formed. It is expedient that the metal wire 20 is surrounded by another metal wire in the reverse winding direction, so that there is then a two-layer metal sheath. This ensures that a complete covering of the elastomer core 19 is ensured even in bends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Bipolar Transistors (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Confectionery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Surface Heating Bodies (AREA)
  • Finger-Pressure Massage (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Building Environments (AREA)
  • Braking Systems And Boosters (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Magnetically Actuated Valves (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (26)

  1. Garniture de compression (1) destinée à être utilisée dans des presses à stratifier, comprenant un tissu (2) qui présente un premier groupe de fils (3) parallèles entre eux et un second groupe de fils (4, 15) parallèles entre eux qui croisent les fils (3) du premier groupe, sachant que les fils (3) du premier groupe sont en métal ou contiennent du métal et que les fils (4, 15) du second groupe sont composés d'une matière élastomère (13) ou en contiennent, et sachant que les fils (3) du premier groupe ondulent autour des fils (4, 15) du second groupe, caractérisée en ce que la densité des fils (4, 15) du second groupe est tellement élevée que les fils (3) du premier groupe ne peuvent passer entre les fils (4, 15) du second groupe qu'en comprimant la matière élastomère (13) dont sont composés ces derniers.
  2. Garniture de compression selon la revendication 1, caractérisée en ce que l'écart entre les fils (4, 15) du second groupe à l'état non déformé est au moins 10% inférieur à l'épaisseur des fils (3) du premier groupe dans un plan passant par l'axe longitudinal de ces fils (3) et s'étendant perpendiculairement au plan de la garniture de compression (1).
  3. Garniture de compression selon la revendication 1 ou 2, caractérisée en ce que les fils (3, 4, 15) sont tissés entre eux de telle manière que les fils (3) du premier groupe ne dépassent pas du plan (14) formé par les points des fils (4, 15) du second groupe situés le plus à l'extérieur.
  4. Garniture de compression selon l'une des revendications 1 à 3, caractérisée en ce que la densité des fils (3) du premier groupe est tellement élevée que la surface qu'ils couvrent est comprise entre 50 et 80%, de préférence entre 60 et 70%.
  5. Garniture de compression selon l'une des revendications 1 à 4, caractérisée en ce que les fils (3, 4, 15) présentent une armure dans laquelle les ondulations (5, 6) des fils (3) du premier groupe sont uniformément réparties.
  6. Garniture de compression selon la revendication 5, caractérisée en ce que le nombre d'ondulations (5, 6) des fils (3) du premier groupe sur chacune des faces du tissu est compris entre 20 et 30 par cm2.
  7. Garniture de compression selon l'une des revendications 1 à 6, caractérisée en ce que la matière élastomère possède une dureté Shore A de 60 à 75.
  8. Garniture de compression selon l'une des revendications 1 à 7, caractérisée en ce que la matière élastomère est un élastomère silicone.
  9. Garniture de compression selon l'une des revendications 1 à 8, caractérisée en ce que la matière élastomère est une mousse et possède un poids spécifique compris entre 0,3 et 0,5 g/cm3.
  10. Garniture de compression selon l'une des revendications 1 à 9, caractérisée en ce que le métal est du cuivre ou un alliage de cuivre dont la résistance a été modifiée.
  11. Garniture de compression selon la revendication 10, caractérisée en ce que le cuivre est un cuivre non recuit (cuivre dur).
  12. Garniture de compression selon l'une des revendications 1 à 11, caractérisée en ce que des fils (3) du premier groupe présentent un fil d'âme en matière plastique (8) qui est entouré d'au moins un fil métallique.
  13. Garniture de compression selon la revendication 12, caractérisée en ce que le fil d'âme en matière plastique (8) est entièrement recouvert par le ou les fils métalliques (9).
  14. Garniture de compression selon la revendication 12 ou 13, caractérisée en ce que des fils métalliques (9) sont toronnés autour du fil d'âme en matière plastique (8).
  15. Garniture de compression selon la revendication 12 ou 13, caractérisée en ce que le fil d'âme en matière plastique (8) est entouré d'au moins un fil métallique.
  16. Garniture de compression selon l'une des revendications 12 à 15, caractérisée en ce que le fil d'âme en matière plastique (8) est composé d'une matière résistante à la chaleur, telle que de l'aramide, du PPS, du PEC, du PEEC ou analogue.
  17. Garniture de compression selon l'une des revendications 1 à 16, caractérisée en ce que des fils (15) du second groupe sont entourés à l'extérieur d'au moins un fil métallique (17).
  18. Garniture de compression selon la revendication 17, caractérisée en ce que l'extérieur des fils (15) du second groupe est entièrement recouvert par le ou les fils métalliques (17, 18).
  19. Garniture de compression selon la revendication 17 ou 18, caractérisée en ce que des fils métalliques (17) sont toronnés à l'extérieur autour des fils (15) du second groupe.
  20. Garniture de compression selon la revendication 17 ou 18, caractérisée en ce que les fils (15) du second groupe sont entourés à l'extérieur d'au moins un fil métallique.
  21. Garniture de compression selon l'une des revendications 1 à 20, caractérisée en ce que les fils (4, 15) du second groupe présentent un fil d'âme (10) qui est entouré par au moins une gaine (13) en une matière élastomère.
  22. Garniture de compression selon la revendication 21, caractérisée en ce que le fil d'âme (10) présente un fil central (11) autour duquel sont toronnés des fils métalliques (12).
  23. Garniture de compression selon l'une des revendications 1 à 22, caractérisée en ce que les fils métalliques (9) sont toronnés en partie en forme de S, en partie en forme de Z.
  24. Garniture de compression selon la revendication 23, caractérisée en ce que les fils métalliques (9) sont toronnés tour à tour en forme de S et en forme de Z.
  25. Garniture de compression selon l'une des revendications 1 à 24, caractérisée en ce que les fils (4, 15) du second groupe possèdent un diamètre d'au moins 1 mm, de préférence d'au moins 1,5 mm.
  26. Garniture de compression selon l'une des revendications 1 à 25, caractérisée en ce que les fils (3) du premier groupe possèdent un diamètre d'au moins 0,15 mm.
EP98120719A 1997-12-05 1998-10-31 Coussinet pour presse Expired - Lifetime EP0920983B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29721495U DE29721495U1 (de) 1997-12-05 1997-12-05 Preßpolster
DE29721495U 1997-12-05

Publications (2)

Publication Number Publication Date
EP0920983A1 EP0920983A1 (fr) 1999-06-09
EP0920983B1 true EP0920983B1 (fr) 2003-09-10

Family

ID=8049522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98120719A Expired - Lifetime EP0920983B1 (fr) 1997-12-05 1998-10-31 Coussinet pour presse

Country Status (10)

Country Link
EP (1) EP0920983B1 (fr)
AT (1) ATE249334T1 (fr)
CZ (1) CZ294633B6 (fr)
DE (2) DE29721495U1 (fr)
DK (1) DK0920983T3 (fr)
ES (1) ES2203869T3 (fr)
HU (1) HU219898B (fr)
PL (1) PL188168B1 (fr)
PT (1) PT920983E (fr)
SK (1) SK284583B6 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE203953T1 (de) * 1999-03-03 2001-08-15 Heimbach Gmbh Thomas Josef Presspolster
EP1033237B1 (fr) 1999-03-03 2004-07-07 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Coussinet pour presse
EP1040910B1 (fr) * 1999-03-03 2001-12-12 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Coussinet pour presse
DE20005266U1 (de) * 2000-03-22 2001-05-10 Bruch & Cie S A R Presspolster sowie Heizplattenpresse mit solchen Presspolstern
GB0008613D0 (en) * 2000-04-08 2000-05-31 Marathon Belting Ltd Improvements to press pads
GB0023529D0 (en) * 2000-09-26 2000-11-08 Marathon Belting Ltd Improvements to press pads
DE10124090B4 (de) * 2001-02-02 2012-07-12 Gkd - Gebr. Kufferath Ag Produktionsmaschine für verdichtete Holzprodukte sowie Verwendung eines Mischgewebes für derarige Produktionsmaschinen
DE20115945U1 (de) * 2001-09-27 2001-12-13 Heimbach Gmbh Thomas Josef Preßpolster
EP1300235B1 (fr) * 2001-09-27 2005-03-09 Thomas Josef Heimbach Gesellschaft mit beschränkter Haftung & Co. Coussinet pour presse
EP1386723B1 (fr) * 2002-07-31 2008-07-30 RHEINISCHE FILZTUCHFABRIK GmbH Coussinet pour presse
DE10337403B3 (de) * 2003-08-13 2004-12-16 Rheinische Filztuchfabrik Gmbh Presspolster
DE202005016935U1 (de) * 2005-10-28 2006-01-26 Espe, Rolf Druckausgleichsgewebe für hydraulische Heizpressenanlagen
GB0608677D0 (en) 2006-05-03 2006-06-14 Marathon Belting Ltd Improvements to press pads
DE102007013871A1 (de) * 2007-03-20 2008-09-25 Gkd - Gebr. Kufferath Ag Aufgerauter Schussdraht
DE202007006849U1 (de) 2007-05-10 2008-06-26 Heimbach Gmbh & Co. Kg Presspolster mit Randverstärkung
DE202010001226U1 (de) * 2010-01-20 2011-05-26 Helmbach GmbH & Co. KG, 52353 Presspolster
DE202012004859U1 (de) * 2012-05-16 2012-06-27 Rolf Espe Presspolster für den Einsatz in hydraulischen Ein- oder Mehretagenheizpressen mit Faserwerkstoffen, die einen negativen linearen Wärmeausdehnungskoeffizienten aufweisen
DE202016000367U1 (de) 2016-01-20 2016-02-05 Rolf Espe Presspolster für Ein- und Mehretagenpressen deren Polsterschicht aus Silikonelastomer im 3D-Druckverfahren aufgetragen wird.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2338749A1 (de) * 1973-07-31 1975-02-13 Becker & Van Huellen Flexible transport- und pressunterlage zur herstellung von holzwerkstoffplatten
JPS61194237A (ja) * 1985-02-21 1986-08-28 東レ・デュポン株式会社 金属線複合弾性糸
ATE122963T1 (de) * 1990-12-31 1995-06-15 Rheinische Filztuchfabrik Gmbh Presspolster für hochdruckpressen.
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 Preßpolster für Hoch- und Niederdruckpressen
DE29704258U1 (de) * 1997-03-08 1997-06-05 Rheinische Filztuchfabrik Gmbh Druckausgleichspolster für Heiz- und Rückkühlpressen

Also Published As

Publication number Publication date
HU9802776D0 (en) 1999-01-28
DE59809559D1 (de) 2003-10-16
PL188168B1 (pl) 2004-12-31
EP0920983A1 (fr) 1999-06-09
SK166898A3 (en) 1999-07-12
SK284583B6 (sk) 2005-07-01
PL330109A1 (en) 1999-06-07
DE29721495U1 (de) 1998-02-19
ATE249334T1 (de) 2003-09-15
CZ294633B6 (cs) 2005-02-16
HUP9802776A1 (hu) 1999-07-28
CZ382198A3 (cs) 1999-06-16
DK0920983T3 (da) 2004-01-26
ES2203869T3 (es) 2004-04-16
PT920983E (pt) 2004-01-30
HU219898B (hu) 2001-08-28

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