EP0916460A1 - Procédé pour le refroidissement de panneaux pressé à chaud, en particulier de panneaux en particules de bois et en fibres de bois, et installation pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour le refroidissement de panneaux pressé à chaud, en particulier de panneaux en particules de bois et en fibres de bois, et installation pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0916460A1
EP0916460A1 EP98119349A EP98119349A EP0916460A1 EP 0916460 A1 EP0916460 A1 EP 0916460A1 EP 98119349 A EP98119349 A EP 98119349A EP 98119349 A EP98119349 A EP 98119349A EP 0916460 A1 EP0916460 A1 EP 0916460A1
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EP
European Patent Office
Prior art keywords
cooling
cooling device
plates
period
water
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.)
Withdrawn
Application number
EP98119349A
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German (de)
English (en)
Inventor
Gerhard Trotscher
Josef Krill
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier 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
Priority claimed from DE1997150847 external-priority patent/DE19750847C1/de
Application filed by Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP0916460A1 publication Critical patent/EP0916460A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a method for cooling hot-pressed plates, in particular Chipboard and fiberboard and a cooling section for carrying out the process according to the Features of the preamble of claims 1 and 14.
  • Fiberboard and / or chipboard are manufactured according to the state of the art from a wide variety of material compositions, for example from wood chips, such as those known on the market as Oriented Strand Board (OSB) and Medium Density Fiber Board (MDF) or similar.
  • the fibers or chips, mixed with binder are fed to the former as a moldable mass and then pressed in a heated press. In a certain pressing time, at relatively high temperatures, the shaped material composition is continuously or discontinuously hot-pressed into sheets or endless belts.
  • the material is then unloaded or fed to a saw, the edges of the plates are trimmed and fed to star wheels or turner, for example, via a roller conveyor. From the turner, the plates reach a stacker via a second roller table and then to an intermediate storage facility.
  • a cooling of this material is therefore necessary because of handling, quality, etc. after pressing. Cooling begins when the panels are trimmed. It continues with the transport to so-called star wheels or turner. Depending on the plate thickness, the plates leave the cooling process at a plate temperature of around 60 to 80 ° C.
  • the cooling medium is air, which removes heat from the surface of the plate in a targeted or non-targeted manner. Depending on the thickness of the plate, this cooling process takes a relatively long time. As a rule, after they leave the system at a temperature between 60 ° C and 80 ° C (average plate temperature), the plates cool down to normal temperature by intermediate storage. Cooling down can take several days. The relatively long cooling time requires corresponding storage capacity, which one would like to do without for cost reasons. The length of the system, which can be up to 80 meters between the hot press and the last star wheel, is another disadvantageous cost factor.
  • the surface of the plates is cooled in a first process step from a temperature which is more than 100 ° C. to a temperature of about 100 ° C. by direct cooling of the plate surface by means of water. This significantly shortens the total cooling time of the plates and significantly minimizes the length of the cooling section.
  • the plate surface can be cooled in different ways, namely by spraying cooling water onto the surface, by a water bath, by a coolant applied to a pair of rollers or by indirect cooling, for example by means of cooled, rotating metal strips.
  • a further process step is inserted between the end of the first process step and the end of the second process step.
  • the plates are exposed to a mixture of saturated water vapor and volatile binder formed within the period t 1 of the first process step for a period t 3 .
  • the reconditioning of the plates is initiated during the first process step, ie the mixture is not suctioned off during the first process step, but the plates remain exposed to it for a period t 3 .
  • the duration of the period t 3 depends on the thickness s of the plates. In any case, the period t 3 is shorter than the period t 2 .
  • the plate surface is cooled to a temperature of less than 70 ° C.
  • the cooling takes place here by means of cooling by means of air nozzles following the intensive water cooling.
  • the intensive cooling with water has the advantage that after a relatively short period of time the post-evaporation of the binder, which is in the range from about 160 ° C. to 100 ° C., is almost complete.
  • the cooling device carrying out the second method step can in the interest of Shortening the overall system e.g. be designed as a multi-level cooling device.
  • the second cooling device can be equipped with means which either direct the cooling air from the atmosphere or from cooling air units or indirectly via one or more Feed the heat exchanger to the plates to be cooled.
  • a mixture consisting of, for example, wood shavings and binding agents is fed to a plate press 2 continuously or discontinuously by known devices and is loaded in the form of individual plates 1 or a flat web-like strand into a transport means immediately downstream of the press 2, for example a roller conveyor, in a provided transport plane 6.
  • the plates 1 after hot pressing on the transport means 6 pass through a cooling section 4, which consists of a separate so-called intensive cooling device 4a and a separate less intensive cooling device 4b .
  • the first cooling device 4a is enclosed by a cooling chamber which has an inlet 4a 'and an outlet 4a''for the plates 1.
  • the cooling chamber is traversed by the aforementioned transport means 3, which is positioned approximately in the middle of the cooling section 4 and forms the transport plane 6 for the plates 1.
  • the cooling device consists of rows of water spray nozzles 7 arranged below and above the transport plane 6 and over the inner width and length of the cooling chamber, the spray direction of which is directed onto the surface of the plates 1. Depending on the cooling capacity required, the cooling water emerges from the spray nozzles under a certain pressure p and cools the plate surface, forming a vapor mixture of water and volatile binder.
  • a reconditioning zone preferably integrated between the first cooling device 4a and the second cooling device 4b, into which the vapor mixture formed in the first cooling device 4a is directed, the plates are subjected to a reconditioning process, the duration of which is shorter than the cooling process of the plates in the second cooling device 4b.
  • the steam mixture already acts on the plates during the intensive cooling process, that is to say is not immediately led out of the cooling device 4a.
  • the steam mixture is passed out of the cooling chamber by means of known measures, passing means (not shown here) for removing, for example, toxic constituents.
  • At least one temperature measuring device 5 for detecting the surface temperature of the plates 1 is arranged at the outlet 4a ′′ of the cooling device 4a, in order to control this or the subsequent cooling process, in particular with regard to the coolant consumption and the throughput speed of the plates 1.
  • the second cooling device 4b is likewise enclosed by a cooling chamber with an inlet 4b 'and an outlet 4b''according to FIGS. 1 to 5.
  • the cooling device 4b consists of rows of air nozzle arrangements 12, 13, which are installed below and above the transport plane 6 and over the inner width and length of the cooling chamber. The nozzle outlets of the air nozzles are directed towards the plate surface.
  • the air nozzle arrangements 12, 13 are connected to circulating air fans, not shown here, which, if necessary, can be regulated in their speed.
  • the first cooling device 4a is designed in the manner of a water bath 8, the water level 8a of which lies above the transport plane 6.
  • the inlet 4a 'and the outlet 4a''of the cooling device 4a are sealed against loss of the cooling water by suitable means 16.
  • the intensive cooling of the plates 1 is thus achieved here in that the plates 1 coming from the press 2 are transported by a suitable transport means 3 through the means 16 into a water bath 8 and out of the water bath.
  • the first cooling device 4a is followed by a second cooling device 4b, the Equipment and functionality of the device shown in Figure 1 corresponds.
  • the first cooling device 4a consists of at least one pair of cooling rollers 9 arranged in the cooling chamber.
  • the cooling roller 9a arranged below the transport plane 6 is accommodated in a rotating manner in a container 17 containing cooling medium.
  • a cooling roller 9b is present above the transport plane 6 and is sprayed with coolant from at least one row of spray nozzles 7.
  • the plates 1 pass through a roll gap 9c which is present or can be formed between the pair of rolls 9 and are thereby adequately cooled.
  • the cooling device 4a consisting of the cooling roller arrangement 9 is followed by a cooling device 4b according to FIGS. 1 and 2.
  • FIG. 4 shows the first cooling device 4a, consisting of an endless metal belt 10, 11 arranged and rotating above and below the transport plane 6, one or more coolant pockets 10b, 11b, through which coolant flows, being arranged between runs 10a and 11a of the respective belt 10,11 .
  • a temperature exchange is thus achieved on the one hand between the circulating metal strips 10, 11 and the surface of the plates 1 and on the other hand between the circulating metal strips 10, 11 and the cooling pockets 10b, 11b.
  • the cooling device 4a consisting of the endless metal strips 10, 11 and cooling pockets 10b, 11b is followed by a cooling device 4b according to FIGS. 1 to 3.
  • the second cooling device 4b can be constructed on several levels, ie each level corresponds in structure to a device as shown in FIG. 1.
  • the formation of the second cooling device 4b can also, as shown in FIG. 5, consist in the fact that the cooling chamber is connected to at least one external cooling air fan 14, supplies the cooling air directly to the cooling device 4b, or that at least one heat exchanger 15 for indirect cooling of the in the Cooling device 4b circulating air is provided.
  • the cooling device 4b can, however, also suck in cooling air directly from the atmosphere, ie without using a cooling air fan 14 or a heat exchanger 15.
  • cooling section 4 consist of a single cooling device operated by means of water and / or cooling air can.
  • the second cooling device 4b can be designed so that it is capable of two or to transport and cool several plates side by side.
  • the hot-pressed material the press 2 leaves as a continuously conveyed belt instead of plates 1 and the belt either cut into plates 1 before intensive water cooling or after this cooling becomes.
  • the temperature (T) is in ° C on the ordinate and the cooling time (t) in min on the abscissa. the cooling device 4b applied.
  • the thickness (s) of the plates 1 is assigned to the course of the curve in question.
  • the diagram is valid for the cooling time curve of the plates 1, assuming certain physical parameters, such as heat transfer coefficient ⁇ , specific heat cp, thermal conductivity ⁇ , specific weight ⁇ and cooling air temperature in ° C, starting with an average plate temperature of around 100 ° C.
  • the diagram therefore represents the second working step of the working method according to the invention.
  • the course of the cooling time during the first working step namely during the intensive cooling of the plates 1, from T 1 100 100 ° C. to a temperature T 2 of approximately 100 ° C. cannot be seen from the diagram.
  • the plate 1 is exposed to cooling air at a temperature T 2 of approximately 100 ° C.
  • the panels are, for example, 16 mm thick, see curve 18 acc. Figure 6, within a time t 2 of about 8 minutes. lowered to a temperature T 3 of 30 ° C.
EP98119349A 1997-11-17 1998-10-14 Procédé pour le refroidissement de panneaux pressé à chaud, en particulier de panneaux en particules de bois et en fibres de bois, et installation pour la mise en oeuvre de ce procédé Withdrawn EP0916460A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19750847 1997-11-17
DE1997150847 DE19750847C1 (de) 1997-11-17 1997-11-17 Verfahren zum Kühlen von heißverpressten Platten, insbesondere Holzspan- und Faserplatten und Kühlstrecke zur Verfahrensdurchführung
DE19821153 1998-05-12
DE19821153 1998-05-12

Publications (1)

Publication Number Publication Date
EP0916460A1 true EP0916460A1 (fr) 1999-05-19

Family

ID=26041669

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Application Number Title Priority Date Filing Date
EP98119349A Withdrawn EP0916460A1 (fr) 1997-11-17 1998-10-14 Procédé pour le refroidissement de panneaux pressé à chaud, en particulier de panneaux en particules de bois et en fibres de bois, et installation pour la mise en oeuvre de ce procédé

Country Status (3)

Country Link
US (1) US6126883A (fr)
EP (1) EP0916460A1 (fr)
JP (1) JP3081192B2 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030054148A1 (en) * 2001-05-25 2003-03-20 Jolitz Randal J. Composite shingle
SE525661C2 (sv) 2002-03-20 2005-03-29 Vaelinge Innovation Ab System för bildande av dekorativa fogpartier och golvskivor därför
US20050126703A1 (en) * 2003-12-11 2005-06-16 Pergo (Europe) Ab Process for the manufacture of a decorative laminate
SE527570C2 (sv) * 2004-10-05 2006-04-11 Vaelinge Innovation Ab Anordning och metod för ytbehandling av skivformat ämne samt golvskiva
US8215078B2 (en) 2005-02-15 2012-07-10 Välinge Innovation Belgium BVBA Building panel with compressed edges and method of making same
US20070175144A1 (en) * 2006-01-11 2007-08-02 Valinge Innovation Ab V-groove
US8323016B2 (en) * 2006-09-15 2012-12-04 Valinge Innovation Belgium Bvba Device and method for compressing an edge of a building panel and a building panel with compressed edges
JP5763096B2 (ja) 2009-12-17 2015-08-12 ベーリンゲ、イノベイション、アクチボラグＶａｅｌｉｎｇｅ Ｉｎｎｏｖａｔｉｏｎ Ａｂ 建物用パネルの表面形成に関する方法及び構成
DE202011110527U1 (de) * 2011-12-22 2014-07-07 Voith Patent Gmbh Vorrichtung zur Kühlung von bewegtem Flachmaterial
DE102011089543A1 (de) * 2011-12-22 2013-06-27 Voith Patent Gmbh Vorrichtung zur Kühlung von bewegtem Flachmaterial
CN102744762B (zh) * 2012-07-19 2017-11-28 昆山吉美川纤维科技有限公司 纤维板生产用烘箱
EP2762300B1 (fr) * 2013-02-01 2016-04-06 Kronotec AG Installation de presse à chaud pour plaques de matière première en bois et procédé de fonctionnement d'une telle installation
US11546991B2 (en) 2020-03-11 2023-01-03 Peter C. Salmon Densely packed electronic systems
US10966338B1 (en) 2020-03-11 2021-03-30 Peter C. Salmon Densely packed electronic systems
US11393807B2 (en) 2020-03-11 2022-07-19 Peter C. Salmon Densely packed electronic systems
US11523543B1 (en) 2022-02-25 2022-12-06 Peter C. Salmon Water cooled server
US11445640B1 (en) 2022-02-25 2022-09-13 Peter C. Salmon Water cooled server

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS621501A (ja) * 1985-06-27 1987-01-07 Noda Plywood Mfg Co Ltd 繊維板の製造方法
EP0255950A2 (fr) * 1986-08-07 1988-02-17 Homanit GmbH & Co.KG Procédé de fabrication de panneaux de fibres de bois
GB2232634A (en) * 1989-06-13 1990-12-19 Agrifibre Dev Ltd Method and apparatus for compression moulding resin bound low bulk density material
US5008057A (en) * 1988-11-30 1991-04-16 Glunz Aktiengesellschaft Method of producing a structure, more particularly a wooden structure, in the surface of a hardened fibreboard
DE4244367A1 (de) * 1992-12-29 1994-06-30 Biele S A Anlage zum Abkühlen von Tafeln oder Platten
JPH06293009A (ja) * 1992-01-31 1994-10-21 Noda Corp 繊維板の製造方法

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Publication number Priority date Publication date Assignee Title
US4957671A (en) * 1985-06-11 1990-09-18 M. A. Industries, Inc. Manufacture of plastic products

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS621501A (ja) * 1985-06-27 1987-01-07 Noda Plywood Mfg Co Ltd 繊維板の製造方法
EP0255950A2 (fr) * 1986-08-07 1988-02-17 Homanit GmbH & Co.KG Procédé de fabrication de panneaux de fibres de bois
US5008057A (en) * 1988-11-30 1991-04-16 Glunz Aktiengesellschaft Method of producing a structure, more particularly a wooden structure, in the surface of a hardened fibreboard
GB2232634A (en) * 1989-06-13 1990-12-19 Agrifibre Dev Ltd Method and apparatus for compression moulding resin bound low bulk density material
JPH06293009A (ja) * 1992-01-31 1994-10-21 Noda Corp 繊維板の製造方法
DE4244367A1 (de) * 1992-12-29 1994-06-30 Biele S A Anlage zum Abkühlen von Tafeln oder Platten

Non-Patent Citations (2)

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Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 168 (M - 594) 29 May 1987 (1987-05-29) *
PATENT ABSTRACTS OF JAPAN vol. 095, no. 001 28 February 1995 (1995-02-28) *

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US6126883A (en) 2000-10-03
JPH11221810A (ja) 1999-08-17
JP3081192B2 (ja) 2000-08-28

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