EP0864414A2 - Hot-plate press for panel pressing - Google Patents
Hot-plate press for panel pressing Download PDFInfo
- Publication number
- EP0864414A2 EP0864414A2 EP98200549A EP98200549A EP0864414A2 EP 0864414 A2 EP0864414 A2 EP 0864414A2 EP 98200549 A EP98200549 A EP 98200549A EP 98200549 A EP98200549 A EP 98200549A EP 0864414 A2 EP0864414 A2 EP 0864414A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- front plate
- plate
- panel
- heated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
- B30B15/062—Press plates
- B30B15/064—Press plates 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
- B30B15/061—Cushion plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/34—Heating or cooling presses or parts thereof
Definitions
- the present invention relates to a hot-plate press for forming coated panels.
- presses having two opposite hot plates are currently present.
- Sandwiched between the press plates is a laminated assembly made up of a panel to the faces of which coatings usually consisting of paper materials impregnated with melamine, urea or phenolic resins are applied.
- Metal sheets of the so-called “finish type” with a thickness of 3-5 mm are usually applied to the hot-plate surfaces for the purpose of giving the ennobled panel the desired surface appearance, that is a glossy, half-lustre or structured (i.e. provided with slight impressions of various types to be then reproduced on the panel coatings) look.
- a cushion Interposed between the metal sheets and the hot plates of the press is a cushion the function of which is to make pressure distribution over the whole surface uniform, as otherwise said pressure would concentrate only in some regions due to defects in the pressing plates and tolerances in the panel thickness.
- the cushion is usually formed of fabrics made of vegetable fibres. Also contained in said cushion are metal wires, currently copper wires, so as to achieve a sufficient heat conduction between the press plates and the finish sheets.
- said cushion is indispensable in present presses, it creates many drawbacks. For instance, it has a limited lifetime because, as it is subjected to compression, it loses its features of pressure distributor almost quickly and becomes a stiff body: therefore it has to be replaced rather frequently, which will be time-consuming and expensive. Due to the fact that the cushion must have a relatively high thickness (also for the purpose of not losing its elastic features too quickly), its insulating effect makes the thermal yield of the press worse. On the other hand, too many metal wires contained therein would impair the cushion elasticity.
- Presses with pressing heads formed of two superposed plates separated by a rigid heat insulator have been also proposed. In these presses, only the outer or front plate is heated. Such a structure however has been proposed only for the purpose of avoiding heat transmission to the press structure and increasing efficiency of the heating circuit.
- the two superposed plates however, are rigidly connected with each other, optionally separated by a rigid insulator, and actually constitute a single integral body. Therefore, use of the same cushions as in the above mentioned presses is required for these presses too and they suffer for similar drawbacks.
- a press for increasing panel valuableness generally denoted by 10
- the press comprises a frame 14 bearing a pair of faced pressing heads 11, 12, movable towards each other (by means of upper cylinders 15, for example) to press a known laminated panel (generally identified by 13) between them.
- the panel is made up of an inner panel coated with finish sheets on both faces thereof. Said panel will not be herein further shown or described, as it is of a well-known type.
- the pressing heads 11, 12 are each formed of a rear plate 16, 17 and a front plate 18, 19.
- the front plate is, for instance, heated by ducts disposed internally thereof and passed through by a hot fluid.
- the rear plate can be advantageously cooled by inner ducts run through by a cooling fluid.
- the cooling fluid and hot fluid are supplied from appropriate sources not shown, as they can be of any known type.
- Elastic and thermally insulating layers are disposed between the front and rear plates of each head, so as to hinder heat transmission between the front plate and rear plate and enable adaptation movements of the front plate.
- these layers can be formed of a rigid and thermally insulating layer of appropriate material (a laminate of fibre glass fabric impregnated with heat-resistant resins, for example), identified by 20 and 21 respectively, in contact with the front plate 18, 19, and an elastically yielding layer 22, 23 in contact with the rear plate 16, 17.
- the elastically yielding layer may consist for example of a sheet of a thickness of some millimetres, made of rubber of appropriate density. In this way, the elastic layer is not overheated and keeps its properties more easily. At the same time this layer also helps in carrying out heat insulation between the plates.
- Finish metal sheets 24, 25 of a substantially known type are disposed on the facing faces of the two front plates and they are adapted to give the ennobled panel the desired surface appearance.
- the sheets are anchored to the respective head by means of removable fastening members to enable quick dismantling and replacement of same.
- hooks 26 may be provided to be fitted in appropriate seats on the sheet by means of operating jacks 27.
- the front plates are relatively thin (50-60 mm in thickness, for example) and in any case they are sufficiently thin for maintaining some flexibility to the pressing pressures of the press.
- the rear plates are of greater thickness (150-300 mm, for example), so that they can be considered as substantially rigid.
- the thickness ratios of the rear plate to the front plate may be comprised between 2 and 8.
- interposition of the elastic layer enables a certain flexibility to be given to the system.
- flexibility of the thin plate and the compensation capability of the elastic layer even in the presence of small differences in thickness of the material to be pressed, a uniform distribution of pressure will be obtained over the whole pressing surface.
- elastic cushions 28, 29 may be also provided between the front plate and finish sheet. These cushions however, can be of more reduced thickness than those necessary in the known art, since there is already the elastic adaptability offered by the thin plate and the elastic layer between the front and rear plates. Use of a cushion of smaller thickness, and consequently of more reduced heat insulation, enables a lower number of metal wires to be employed therein, so that its cost too will be lower and its elastic features will last longer.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims (5)
- Press for panels comprising two facing press heads (11, 12) movable towards each other and having heated faced surfaces covered with a finish sheet (24, 25) to press a panel between them, characterized in that each press head is formed of a first rear plate (16, 17) and a second front plate (18, 19), the front plate being heated and carrying the finish sheet, a layer of elastic material (22, 23) being present between the front and rear plates.
- Press as claimed in claim 1, characterized in that the rear plate is run through by a cooling fluid.
- Press as claimed in claim 1, characterized in that a further layer (20, 21) of thermally insulating material is interposed between the elastic layer and front plate.
- Press as claimed in claim 1, characterized in that an elastically yielding cushion (28, 29) is interposed between the front plate and finish sheet.
- Press as claimed in claim 1, characterized in that the thickness ratio of the front plate to the rear plate is included between 2 and 8.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97MI000446A IT1289997B1 (en) | 1997-02-28 | 1997-02-28 | HEATED PLATE PRESS WITH IMPROVED FEATURES FOR PANEL PRESSING |
ITMI970446 | 1997-02-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0864414A2 true EP0864414A2 (en) | 1998-09-16 |
EP0864414A3 EP0864414A3 (en) | 1999-04-14 |
EP0864414B1 EP0864414B1 (en) | 2003-01-02 |
Family
ID=11376231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98200549A Expired - Lifetime EP0864414B1 (en) | 1997-02-28 | 1998-02-20 | Hot-plate press for panel pressing |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0864414B1 (en) |
AT (1) | ATE230350T1 (en) |
DE (1) | DE69810365T2 (en) |
DK (1) | DK0864414T3 (en) |
ES (1) | ES2189076T3 (en) |
IT (1) | IT1289997B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10208659A1 (en) * | 2002-02-28 | 2003-09-04 | Buerkle Gmbh Robert | Plate press with heating and cooling system |
CN103659954A (en) * | 2014-01-02 | 2014-03-26 | 王梁 | Wear-resistant steel template and manufacturing method thereof |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6752901B2 (en) | 2002-04-05 | 2004-06-22 | Heinrich Wemhoener Gmbh & Co. Kg | Coating press for sheet-like work-pieces |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1007047B (en) * | 1956-02-18 | 1957-04-25 | Becker & Van Huellen | Hydraulic hot plate press |
DE2615898A1 (en) * | 1976-04-10 | 1977-10-20 | Siempelkamp Gmbh & Co | Forming press for continuous lengths of woodchip etc. board - is intermittently heated electrically as the board moves on |
AT372901B (en) * | 1982-02-23 | 1983-11-25 | Ott Paul Gmbh & Co Kg | HEATING PLATE FOR A PRESS, IN PARTICULAR HYDRAULIC VENEER PRESS |
DE3222183C1 (en) * | 1982-06-12 | 1983-12-29 | Dusan 6367 Karben Mihajlovic | Device for the permanent coating of large format sheets |
EP0154970A2 (en) * | 1984-03-16 | 1985-09-18 | DATACARD-MIDS GmbH | Laminating device for manufacturing identification cards |
EP0440945A2 (en) * | 1990-02-03 | 1991-08-14 | Ferrozell Gmbh | Method of pressing plates from layers of impregnated material using a pressure equalising cushion, and cushion for use in this process |
-
1997
- 1997-02-28 IT IT97MI000446A patent/IT1289997B1/en active IP Right Grant
-
1998
- 1998-02-20 DK DK98200549T patent/DK0864414T3/en active
- 1998-02-20 EP EP98200549A patent/EP0864414B1/en not_active Expired - Lifetime
- 1998-02-20 ES ES98200549T patent/ES2189076T3/en not_active Expired - Lifetime
- 1998-02-20 DE DE69810365T patent/DE69810365T2/en not_active Expired - Fee Related
- 1998-02-20 AT AT98200549T patent/ATE230350T1/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1007047B (en) * | 1956-02-18 | 1957-04-25 | Becker & Van Huellen | Hydraulic hot plate press |
DE2615898A1 (en) * | 1976-04-10 | 1977-10-20 | Siempelkamp Gmbh & Co | Forming press for continuous lengths of woodchip etc. board - is intermittently heated electrically as the board moves on |
AT372901B (en) * | 1982-02-23 | 1983-11-25 | Ott Paul Gmbh & Co Kg | HEATING PLATE FOR A PRESS, IN PARTICULAR HYDRAULIC VENEER PRESS |
DE3222183C1 (en) * | 1982-06-12 | 1983-12-29 | Dusan 6367 Karben Mihajlovic | Device for the permanent coating of large format sheets |
EP0154970A2 (en) * | 1984-03-16 | 1985-09-18 | DATACARD-MIDS GmbH | Laminating device for manufacturing identification cards |
EP0440945A2 (en) * | 1990-02-03 | 1991-08-14 | Ferrozell Gmbh | Method of pressing plates from layers of impregnated material using a pressure equalising cushion, and cushion for use in this process |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10208659A1 (en) * | 2002-02-28 | 2003-09-04 | Buerkle Gmbh Robert | Plate press with heating and cooling system |
CN103659954A (en) * | 2014-01-02 | 2014-03-26 | 王梁 | Wear-resistant steel template and manufacturing method thereof |
CN103659954B (en) * | 2014-01-02 | 2016-06-29 | 王梁 | A kind of abrasion-resistant stee template and preparation method |
Also Published As
Publication number | Publication date |
---|---|
ES2189076T3 (en) | 2003-07-01 |
EP0864414A3 (en) | 1999-04-14 |
EP0864414B1 (en) | 2003-01-02 |
DK0864414T3 (en) | 2003-04-22 |
IT1289997B1 (en) | 1998-10-19 |
ATE230350T1 (en) | 2003-01-15 |
ITMI970446A1 (en) | 1998-08-28 |
DE69810365T2 (en) | 2003-10-09 |
DE69810365D1 (en) | 2003-02-06 |
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