EP3927540B1 - Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit - Google Patents

Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit Download PDF

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Publication number
EP3927540B1
EP3927540B1 EP20706437.9A EP20706437A EP3927540B1 EP 3927540 B1 EP3927540 B1 EP 3927540B1 EP 20706437 A EP20706437 A EP 20706437A EP 3927540 B1 EP3927540 B1 EP 3927540B1
Authority
EP
European Patent Office
Prior art keywords
press
press pad
spring elements
pad
metal
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
EP20706437.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3927540A2 (de
Inventor
Rolf Espe
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.)
Hueck Rheinische GmbH
Original Assignee
Hueck Rheinische 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 Hueck Rheinische GmbH filed Critical Hueck Rheinische GmbH
Priority to EP22160709.6A priority Critical patent/EP4032694A1/de
Publication of EP3927540A2 publication Critical patent/EP3927540A2/de
Application granted granted Critical
Publication of EP3927540B1 publication Critical patent/EP3927540B1/de
Active legal-status Critical Current
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
    • 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
    • B30B15/062—Press plates
    • B30B15/064—Press plates with heating or cooling means
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B27N7/005—Coating boards, e.g. with a finishing or decorating layer
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/20—Metallic fibres

Definitions

  • the invention relates to a press pad for use in a hydraulic single or multi-level heating press.
  • the invention relates to a press pad/press plate unit and a press pad/heating plate unit.
  • the coating of wood-based panels is usually done with high-grade cellulose paper impregnated with amino resin.
  • These papers can be printed with different decors or be single-colored.
  • the amino resins consist of pre-condensed melamine/formaldehyde resins or mixed resins of melamine and urea or phenol and cresol.
  • the pre-condensed resins are in a liquid phase, which is why paper webs are thoroughly saturated in special impregnation channels with drying and cooling zones. In the heated drying zone, the polycondensation of the resins is stimulated again at a temperature between approx. 150°C and 170°C and interrupted in a subsequent cooling zone, depending on the desired degree of condensation.
  • the paper webs obtained in this way have a low water content and are solid and therefore transportable for further processing in a press installation, in particular in the form of a hydraulic single-daylight or multi-daylight heating press.
  • the impregnated decor papers are now used with the appropriately selected wood-based panels in a hydraulic heating press, which can have one or, alternatively, multiple tiers.
  • the precondensed amino resins first become liquid under pressure and temperature, with the viscosity of the liquid resins increasing again as a result of further molecular crosslinking and finally a solid surface being formed.
  • metallic press plates with structured, matt or shiny surfaces are brought into contact with the decorative papers or the amino resins.
  • the press plates are usually chrome-plated to protect the surface against abrasion and damage.
  • the chrome layer also has the function that after the coating process (lamination) a perfect separation from the resin layer can take place.
  • Metallic press plates can be made, for example, from brass, the alloy MS64 or the materials AISI 410 or AISI 630 exist, with steel sheets being preferred today due to their greater hardness and longer service life.
  • the wood-based panels have different bulk densities and therefore also require different pressing pressures.
  • the specific pressing pressures are particularly high and amount to approx. 400 N/cm 2 to 600 N/cm 2 , since the raw densities of the panels are around 800 N/cm cm 3 to 1000 N/cm 3 .
  • the raw panels themselves have a very low cushioning effect of their own and also have thickness tolerances that have to be compensated for during the coating process. In principle, all panel materials have greater or lesser thickness tolerances. Further tolerances result from the respective press system itself, in particular the press plates and the heating plates present in it.
  • the press systems are always equipped with appropriate press cushions, in particular those in the form of pressure-compensating fabrics or mats.
  • the press pads are fixed between the heating plates and the press plates. They must be thermally stable, ie they must not decompose even at temperatures between 200°C and 230°C, they must have good resilience or restoring force and high thermal conductivity. The even distribution of pressure and the rapid flow of heat during the coating process are particularly important factors. As previously mentioned, under pressure and heat, the aminoplast resin reflows, giving off formaldehyde and water in vapor form.
  • the system Since the resin is located between the metallic press plate and the wood-based panel, the system is hermetically sealed and the corresponding vapors have to diffuse into the paper web and the panel surface in the short time specified by the clocking of the press systems. If this does not happen because the pressure is uneven, the gas bubbles remain trapped in the resin layer and are later visible as milky, cloudy spots on the surface. Boards with such defects are then no longer suitable for further use. Due to the high heating plate temperatures (approx. 200°C to 230°C), the selection of suitable materials for the press pads is comparatively small. In recent decades, an elastomeric material based on silicone rubber has proven to be suitable, with blend materials and copolymers made from silicone rubber and fluorosilicone rubber or fluororubber also being used. The prior art press pads are typically constructed as fabrics containing elastomeric material Threads or as coated mats with an inner, mostly metallic supporting fabric.
  • a press pad having a fabric which contains a copolymer consisting of a silicone and a fluorosilicone rubber.
  • the copolymer is incorporated into the press cushion in the form of coated threads that are used as warp or weft threads.
  • metallic additives can be added to the elastomer material.
  • the EP 0 735 949 A1 describes a press pad which has a silicone elastomer in one thread system and metal threads in the other thread system.
  • the threads containing the silicone elastomer can be designed as sheath-core threads, with the thread core being made of wire and the thread sheath being made of the silicone elastomer, for example.
  • EP 1 300 235 A and the DE 23 19 593 A are from the EP 1 300 235 A and the DE 23 19 593 A in each case a press cushion made of metal fabric, which is then coated essentially over the entire surface with a silicone rubber.
  • the metal threads lying on a surface of the press pad, in particular their loops or loops are exposed by squeegeeing during the coating process in order in this way to achieve metallic contact between the press pad and the heating plate or press plate.
  • Particles can also be added to the silicone elastomer to increase thermal conductivity.
  • a disadvantage in this context is the fact that the addition of the particulate additives to the elastomer matrix has a negative effect on its elasticity and also its resilience properties.
  • the known press pads often have the disadvantage of material fatigue, in particular with regard to their restoring force or spring effect.
  • the press pads therefore have to be replaced relatively early, which results in downtimes of the press systems and increased environmental pollution, especially since the press pads made of the known materials or material mixtures are very poorly recyclable are.
  • press pads are required that have a high resilience value over a long period of use and a very high heat transfer.
  • press pads according to the invention can also be used in so-called high-pressure press systems in which, for example, so-called high-pressure laminates, for example in the form of base materials for printed circuit boards, are produced by pressing under heat.
  • a press cushion for such an application which consists of a high-temperature-resistant plastic fleece and a PTFE film bonded thereto, is made of DE 200 11 432 U known. Due to the long cycle times in such pressing processes, metals are not required for this high-pressure cushion.
  • the object of the invention is to provide a press pad that is characterized by a very high elastic resilience, which is maintained over as long a period of time as possible without tiring, as well as a high level of thermal conductivity.
  • this object is achieved, starting from a press pad of the type mentioned at the outset, by a large number of metallic spring elements which are connected to the supporting structure and distributed in or on it.
  • Metallic spring elements have two advantages over elastomer materials or aromatic polymer materials: On the one hand, they can have a very high modulus of elasticity, ie high spring stiffness, due to the metal material. This means that the restoring forces are already very large even with comparatively small deflections, ie deformations, of the spring elements. Examples of metals with a high modulus of elasticity and high elongation at break are steel, especially spring steel. In principle, however, other metal materials such as copper alloys (eg beryllium copper) can also be used. Despite the large spring constants, metallic springs retain their restoring properties over very long periods of time, so that the press pads according to the invention have a correspondingly long service life.
  • metallic spring elements have very good thermal conductivity, so that the heat transfer through the press pad according to the invention is positively influenced, especially in comparison with press pads that have large proportions of an elastomeric material that is characterized by its comparatively poor thermal conductivity properties.
  • the support structure can be formed by a metallic plate, preferably a pressing plate or a heating plate of the single or multi-daylight heating press.
  • a unit is created from the press plate and spring elements or heating plate and spring elements.
  • the spring elements are preferably glued and/or soldered and/or welded and/or positively connected to the respective plate, for example by inserting spring sections into corresponding recesses or openings in the plate.
  • the support structure can be in the form of a textile fabric.
  • the textile fabric can be designed as a knitted or crocheted fabric or nonwoven or woven fabric, with at least some of the threads that form the textile fabric being made of metal or containing metal, the metal being made in particular of brass, copper, bronze, steel, in particular stainless steel, can be formed.
  • a combination of a metal plate and a textile fabric to form the support structure is also an option.
  • the spring elements are preferably connected to the textile fabric and/or the metal plate.
  • a suitable connection between the textile fabric and the metallic plate is required, for example in the form of gluing or welding or soldering or a positive connection between threads of the textile fabric and the plate, e.g. threads of the textile fabric being guided through openings or recesses in the metallic plate.
  • Plate springs or helical springs or leaf springs or wave springs can preferably be used as metallic spring elements.
  • the spring elements can have openings through which threads of the textile fabric, in particular the aforementioned warp and weft threads, are passed.
  • a particularly preferred embodiment is formed by a press cushion in which the spring elements each have four openings, two of which have a warp thread and the other two have a weft thread.
  • the crossing points of the respective threads can be designed particularly advantageously in this way.
  • the spring elements should be arranged equidistantly from one another, in particular in crossing rows, further in particular along the weft and/or warp threads of a fabric serving as the supporting structure. This results in a kind of matrix structure and a particularly simple arrangement of the spring elements.
  • the spring elements can be partially embedded in an elastomeric material, preferably in a silicone elastomer or a fluorosilicone elastomer or a blend polymer or copolymer of the two aforementioned elastomers.
  • Sections or parts of the spring elements on both opposite sides of the press pad preferably form part of the surface of the press pad. In this way, a particularly good heat transfer is achieved since the transfer of heat on both surfaces of the press pad is created by metallic contact surfaces of the press pad to the press plate or to the heating plate. It is particularly advantageous in this connection if the spring elements extend through the press pad completely over its entire thickness in order to optimize the conduction of heat.
  • particles to the elastomeric material In connection with a combination of metallic spring elements with an elastomeric material, it can be useful to add particles to the elastomeric material to increase the thermal conductivity of the press pad. These are, in particular, particles made of a metal or a mineral, with these particles preferably being in the form of nanoparticles.
  • FIG. 1 An embodiment in the figure 1 is shown includes a press pad 1 'according to the invention for use in a hydraulic single or multi-daylight heating press. As in the prior art, it is provided to arrange the press pad 1 between a heating plate and a pressing plate of a single or multi-level heating press in order to compensate for thickness tolerances present in the pressing plate or the heating plate and at the same time to transfer the heat emitted by the heating plate to the pressing plate make possible.
  • the press pad 1 comprises a planar support structure 2 and a multiplicity of spring elements 3.
  • the planar support structure 2 is in the form of a fabric which comprises two thread systems 4, 5, namely warp threads 6 and weft threads 7.
  • the warp threads 6 and the weft threads 7 are in the form of wire strands made of brass and are woven together to form a plain weave.
  • the warp threads 6 accordingly run alternately over and under the weft threads 7 and vice versa.
  • the spring elements 3 of the press pad 1 are designed in the form of metal disk springs 8 .
  • the disc spring 8 When used in a single or multi-daylight heating press, the disc spring 8 is in an undeformed state with only a circular, circumferential, upper edge 9 with a heating plate of a single or multi-daylight heating press and with a likewise circular, circumferential, lower edge 10 with a pressing plate a single or multi-level heating press in contact, with the two edges 9, 10 each forming a circular contact line 11, 12.
  • a reverse orientation of the Spring element 3 conceivable, in which the upper edge 9 is in contact with the press plate and the lower edge 10 with the heating plate.
  • cup springs 8 have beveled (conical) side sections 15 which bring about a reduction in a diameter of the first contact line 11 compared to a diameter of the second contact line 12 .
  • a section through a plate spring 8 is in the figure 2 shown and illustrates a truncated cone shape.
  • the spring element 3 is deformed in such a way that a planar, upper contact surface 13 is formed.
  • a planar, lower contact surface 14 is formed.
  • one of the contact surfaces 13, 14 is in contact with the heating plate when used in a single or multi-level heating press, while the other contact surface 13, 14 is in contact with the pressing plate.
  • the disc spring 8 thus essentially assumes the shape of a hollow cylinder during the pressing process.
  • the disk springs 8 are provided with four openings 17, which are arranged at an angle of 90° to one another on a circle and, to simplify production, can also be open towards the circular outer edge of the disk spring 8 in order to insert the weft threads 7 or Warp threads 6 do not have to be "threaded through” with one thread end but can be “threaded in” from the side.
  • a thread 6, 7 of a thread system 4, 5 is passed through two opposite openings 17 in the spring elements 3, while the remaining two openings 17 are provided for receiving a thread 6, 7 of the corresponding other thread system 4, 5.
  • a crossing point 18 of a warp thread 6 and a weft thread 7 essentially corresponds to a central axis 19 of the spring element 3.
  • the plate springs 8 are arranged equidistantly in the press pad 1 and form rows in the press pad 1 crossing at an angle of 90°. The press pad 1 is therefore easy to roll up and transport.
  • an upper contact surface of the press cushion 1 is formed by the totality of the upper contact surfaces 9 of the individual plate springs 8, while a lower contact surface of the press cushion 1' is determined by the totality of the lower contact surfaces 10 of the individual plate springs 8.
  • FIG figure 3 A further exemplary embodiment of the press pad 1' according to the invention is shown in FIG figure 3 shown.
  • the press pad 1 ' also includes a flat support structure 2 in the form of a fabric and a variety of metallic spring elements 3.
  • the press pad 1' according to figure 2 a coating 25 on both sides of a heat-stable elastomeric material. That in the figure 1
  • the press pad 1' shown is therefore essentially embedded in the elastomeric material.
  • the coating 25 is removed in the area of each spring element 3, as well as in FIG figure 4 is recognizable.
  • a lower surface and a lower surface 26 of the press pad 1 ′ are therefore partially formed by the spring elements 3 .
  • a one-daylight heating press 27 is in figure 5 shown.
  • the single-daylight heating press 27 comprises two heating plates 28 and two pressing plates 29.
  • a press pad 1′, 1 according to the invention is to be arranged between a heating plate 28 and a pressing plate 29 of the single-daylight heating press 27.
  • a wood material board 30 to be coated is inserted between the two press plates 29 and is covered with a decorative paper not shown in the figure.
  • the decorative paper is bonded to the wood-based panel 30 by means of the heat emitted by the single-daylight heating press 27 and the pressure exerted on the wood-based panel 30 .
  • FIG figure 6 An embodiment of a press pad heating plate unit 31 according to the invention, which is shown in FIG figure 6 is shown, includes a press pad 1, 1 'according to the invention and a heating plate 28 of a single or multi-stage heating press.
  • the press pad 1, 1' is glued to the heating plate 28 in such a way that a single component is formed.
  • FIG figure 6 An exemplary embodiment of a press cushion press plate unit 32 according to the invention is shown in FIG figure 6 shown.
  • the press pad 1′, 1 according to the invention is not connected to a heating plate 28, but to a press plate 29 of a single or multi-level heating press, for example glued, and thus also forms a single component.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP20706437.9A 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit Active EP3927540B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22160709.6A EP4032694A1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202019000828.4U DE202019000828U1 (de) 2019-02-20 2019-02-20 Presspolster mit hoher Federwirkung auf metallischer Basis für die Beschichtung von Holzwerkstoffplatten und Herstellung von Kunststoffplatten in hydraulischen Ein- und Mehretagenheizpressen.
PCT/EP2020/054156 WO2020169556A2 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und pressblech-heizplatten-einheit

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP22160709.6A Division-Into EP4032694A1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit
EP22160709.6A Division EP4032694A1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit

Publications (2)

Publication Number Publication Date
EP3927540A2 EP3927540A2 (de) 2021-12-29
EP3927540B1 true EP3927540B1 (de) 2023-07-19

Family

ID=69645953

Family Applications (2)

Application Number Title Priority Date Filing Date
EP22160709.6A Pending EP4032694A1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit
EP20706437.9A Active EP3927540B1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP22160709.6A Pending EP4032694A1 (de) 2019-02-20 2020-02-18 Presspolster für den einsatz in einer hydraulischen ein- oder mehretagen-heizpresse sowie presspolster-pressblech-einheit und presspolster-heizplatte-einheit

Country Status (8)

Country Link
US (1) US12076955B2 (zh)
EP (2) EP4032694A1 (zh)
JP (1) JP7337942B2 (zh)
CN (1) CN113439022B (zh)
BR (1) BR112021015190A2 (zh)
DE (1) DE202019000828U1 (zh)
ES (1) ES2953330T3 (zh)
WO (1) WO2020169556A2 (zh)

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CN109049809A (zh) * 2018-07-10 2018-12-21 安徽省宇鸿纺织工艺制品有限公司 一种密封性强的羽绒家纺生产用压实机
CN108638565A (zh) * 2018-07-12 2018-10-12 江阴盛鼎机械制造有限公司 一种用于液压机的压力垫

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Publication number Publication date
CN113439022A (zh) 2021-09-24
US20220001636A1 (en) 2022-01-06
US12076955B2 (en) 2024-09-03
CN113439022B (zh) 2023-11-07
WO2020169556A2 (de) 2020-08-27
JP2022521202A (ja) 2022-04-06
JP7337942B2 (ja) 2023-09-04
WO2020169556A3 (de) 2020-10-15
EP4032694A1 (de) 2022-07-27
EP3927540A2 (de) 2021-12-29
BR112021015190A2 (pt) 2021-09-28
ES2953330T3 (es) 2023-11-10
DE202019000828U1 (de) 2020-02-24

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