EP0220701B1 - Process for the continuous production of chip, fibre or similar boards - Google Patents

Process for the continuous production of chip, fibre or similar boards Download PDF

Info

Publication number
EP0220701B1
EP0220701B1 EP86114843A EP86114843A EP0220701B1 EP 0220701 B1 EP0220701 B1 EP 0220701B1 EP 86114843 A EP86114843 A EP 86114843A EP 86114843 A EP86114843 A EP 86114843A EP 0220701 B1 EP0220701 B1 EP 0220701B1
Authority
EP
European Patent Office
Prior art keywords
heated
pressurising
fleece
pressure
temperature
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
EP86114843A
Other languages
German (de)
French (fr)
Other versions
EP0220701A1 (en
Inventor
Hans-Peter Steininger
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.)
Wilhelm Mende & Co GmbH
Original Assignee
Wilhelm Mende & 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 Wilhelm Mende & Co GmbH filed Critical Wilhelm Mende & Co GmbH
Priority to AT86114843T priority Critical patent/ATE55311T1/en
Publication of EP0220701A1 publication Critical patent/EP0220701A1/en
Application granted granted Critical
Publication of EP0220701B1 publication Critical patent/EP0220701B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to a method of the type mentioned in the preamble of claim 1 for the continuous production of chipboard, fiber and the like.
  • the invention is based on the object of specifying a method of the type in question, the use of which improves the quality of the chipboard web produced, the binder consumption is reduced and an increase in performance and simplification is achieved.
  • a surprising improvement in quality, combined with a reduction in binder consumption, is - in contrast to the known - the result of the fact that, on the one hand, no excessive pressures are used, but only those absolutely necessary to achieve the final thickness of the respective sheet strand, and, on the other hand, additional pressure is applied to the steel strip will only take place if the best possible effects of this pressure application are achieved according to the fleece temperature.
  • the steel strip is additionally heated from the outside by contact and / or radiant heat.
  • a heated roller is expediently used, the temperature of which lies between the temperature of the pressure roller on the inlet side and the temperature of the press roller.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Materials For Medical Uses (AREA)
  • Nonwoven Fabrics (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Laminated Bodies (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Stringed Musical Instruments (AREA)
  • Paper (AREA)

Abstract

1. Method of continuously producing chip boards, fibre boards and like boards, with which a fleece formed on a support and consisting of lignocellulose and/or cellulose-containing chips, fibres and the like, mixed with at least one bonding agent, is pressed while being heated in a calander press with a heated pressurising drum embraced over a part of its circumference by a steel band running over guide rollers and pressurising rollers and is discharged in the form of a continuous length of board, the fleece being compressed at the leading end of the pressing gap and then being heated while enclosed between heated pressurising drums and steel band and while being simultaneously advanced and is brought to the necessary hardening temperature, an additional application of pressure being applied to the steel strip, at least at one further circumferential position of the heated pressurising drum and thus to the fleece, which is under the radial holding pressure of the steel band, and thereafter the fleece is cured to form a finally compressed length of board, characterised in that the additional application of pressure only takes place after a time when the particles are heated to a temperature at which they are fully transformed into their yieldable state, and which corresponds substantially to the final hardening temperature of the bonding agent being used.

Description

Die Erfindung betrifft ein Verfahren der im Oberbegriff des Anspruchs 1 genannten Art zur kontinuierlichen Herstellung von Span-, Faser- und dergleichen -platten.The invention relates to a method of the type mentioned in the preamble of claim 1 for the continuous production of chipboard, fiber and the like.

Durch die DE-OS 2 710 000 ist ein Verfahren der betreffenden Art bekannt, bei dem im Umschlingungsbereich des Bandes zusätzliche Andrückwalzen vorgesehen sind. Diese sollen den Zweck haben, einen sehr hohen Druck zwecks Verbesserung des Verpreßvorganges zu erzeugen. Sie sind verhältnismäßig dicht hinter dem ersten Preßspalt angeordnet, so daß die Späne noch nicht ihre gewünschte Endtemperatur und damit Weichheit erreicht haben. Insofern ist die Aussage in dieser Schrift zutreffend, daß der durch diese Andrückwalzen erzeugte Druck sehr hoch ist. Außerdem sind zwei Walzen vorgesehen, so daß eine Druckerhöhung zweimal erfolgt. Der Aufwand ist daher beträchtlich.From DE-OS 2 710 000 a method of the type in question is known, in which additional pressure rollers are provided in the wrapping area of the belt. The purpose of these is to generate a very high pressure in order to improve the pressing process. They are arranged relatively close behind the first press nip, so that the chips have not yet reached their desired final temperature and thus softness. In this respect, the statement in this document is correct that the pressure generated by these pressure rollers is very high. In addition, two rollers are provided so that the pressure is increased twice. The effort is therefore considerable.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der betreffenden Art anzugeben, bei dessen Anwendung die Qualität der gefertigten Spanplattenbahn verbessert, der Bindemittelverbrauch erniedrigt und eine Leistungssteigerung und Vereinfachung erzielt wird.The invention is based on the object of specifying a method of the type in question, the use of which improves the quality of the chipboard web produced, the binder consumption is reduced and an increase in performance and simplification is achieved.

Die der Erfindung zugrundeliegende Aufgabe wird durch die im Kennzeichen des Anspruchs 1 angegebene Lehre gelöst.The object on which the invention is based is achieved by the teaching specified in the characterizing part of claim 1.

Eine überraschende Qualitätsverbesserung, verbunden mit einer Verringerung des Bindemittelverbrauchs, ist - im Gegensatz zum Bekannten - die Folge davon, daß einerseits keine übermäßigen, sondern nur die zur Erzielung der Enddicke des jeweiligen Plattenstranges unbedingt erforderlichen Drücke angewandt werden und andererseits eine zusätzliche Druckanwendung auf das Stahlband erst dann erfolgt, wenn sich entsprechend der Vliestemperatur die bestmöglichen Auswirkungen dieser Druckanwendung einstellen.A surprising improvement in quality, combined with a reduction in binder consumption, is - in contrast to the known - the result of the fact that, on the one hand, no excessive pressures are used, but only those absolutely necessary to achieve the final thickness of the respective sheet strand, and, on the other hand, additional pressure is applied to the steel strip will only take place if the best possible effects of this pressure application are achieved according to the fleece temperature.

Vorzugsweise wird in dem Umfangsbereich der geheizten Preßtrommel, in dem die Teilchen in den nachgiebigen Zustand überführt werden, das Stahlband von außen durch Kontakt- und/oder Strahlungswärme zusätzlich aufgeheizt. Damit läßt sich eine gut dosierbare Wärmeeinwirkung auf das Stahlband und damit auch ein Aufheiz-Temperaturgradient im jeweiligen Vlies erzielen, der sicherstellt, daß an der Stelle, an der eine zusätzliche Druckausübung erfolgt, die für die Druckausübung günstigste Temperatur im Vlies vorliegt.Preferably, in the peripheral region of the heated press drum, in which the particles are transferred to the compliant state, the steel strip is additionally heated from the outside by contact and / or radiant heat. This makes it possible to achieve a well-controlled action of heat on the steel strip and thus also a heating-up temperature gradient in the respective fleece, which ensures that at the point at which additional pressure is exerted, the temperature which is most favorable for the pressure exertion is present in the fleece.

Zur zusätzlichen Druckanwendung wird zweckmäßigerweise eine beheizte Walze verwendet, deren Temperatur zwischen der Temperatur der eingangsseitigen Druckwalze und der Temperatur der Preßwalze liegt.For the additional application of pressure, a heated roller is expediently used, the temperature of which lies between the temperature of the pressure roller on the inlet side and the temperature of the press roller.

Bei der Durchführung des Verfahrens nach der Erfindung ist es wesentlich, daß bei der Verwendung von Druckwalzen zur zusätzlichen Druckausübung biegesteife Druckwalzen verwendet werden. In diesem Zusammenhang wirkt sich günstig aus, daß der Durchmesser derartiger Druckwalzen deutlich kleiner gewählt werden kann als der Durchmesser der eingangsseitig vorgesehenen Druckwalze, weil das nachgiebige und auf die erforderliche Aushärtetemperatur des Bindemittels erhitzte Vlies an den Stellen, an denen diese Druckwalzen wirksam sein müssen, nunmehr wesentlich leichter verdichtbar ist als am Preßspaltbeginn. Auch aus diesem Grunde kann die Forderung nach einer Biegesteifigkeit der jeweiligen Druckwalze ohne besonderen Aufwand erfüllt werden.When carrying out the method according to the invention, it is essential that when using pressure rollers for the additional application of pressure, rigid pressure rollers are used. In this context, it has a favorable effect that the diameter of such pressure rollers can be selected to be significantly smaller than the diameter of the pressure roller provided on the input side, because the flexible nonwoven heated to the required curing temperature of the binder at the points at which these pressure rollers must be effective. is now much easier to compress than at the start of the press nip. For this reason too, the requirement for a bending stiffness of the respective pressure roller can be met without any particular effort.

Claims (7)

1. Method of continuously producing chip boards, fibre boards and like boards, with which a fleece formed on a support and consisting of lignocellulose and/or cellulose-containing chips, fibres and the like, mixed with at least one bonding agent, is pressed while being heated in a calander press with a heated pressurising drum embraced over a part of its circumference by a steel band running over guide rollers and pressurising rollers and is discharged in the form of a continuous length of board, the fleece being compressed at the leading end of the pressing gap and then being heated while enclosed between heated pressurising drums and steel band and while being simultaneously advanced and is brought to the necessary hardening temperature, an additional application of pressure being applied to the steel strip, at least at one further circumferential position of the heated pressurising drum and thus to the fleece, which is under the radial holding pressure of the steel band, and thereafter the fleece is cured to form a finally compressed length of board, characterised in that the additional application of pressure only takes place after a time when the particles are heated to a temperature at which they are fully transformed into their yieldable state, and which corresponds substantially to the final hardening temperature of the bonding agent being used.
2. Method according to claim 1, characterised in that, in the peripheral zone of the heated pressurising drum, in which the particles are converted into the elastic state, the steel band is heated from outside by heat of contact and/or radiation.
3. Method according to claim 1 or 2, characterised in that the length of the peripheral zone in which the particles of the fleece are converted into the elastic state is varied according to the intended thickness of the length of board to be produced.
4. Method according to one of the preceding claims, characterised in that the additional pressure is applied linearly.
5. Method according to one of the preceding claims, characterised in that a heated roller is used for exerting the additional pressure, the temperature of the said roller being between the temperature of the pressurising roller on the inlet side and the temperature of the pressurising drum.
6. Method according to one of the preceding claims, characterised in that the application of additional pressure is produced by means of a pressurising roller constructed so as to be resistant to bending.
7. Method according to one of the preceding claims, characterised in that the pressurising roller used for exerting the additional pressure has a diameter which is smaller than the pressurising roller provided on the input side.
EP86114843A 1985-10-30 1986-10-25 Process for the continuous production of chip, fibre or similar boards Expired - Lifetime EP0220701B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114843T ATE55311T1 (en) 1985-10-30 1986-10-25 PROCESS FOR THE CONTINUOUS PRODUCTION OF CHIPBOARD, FIBER AND LIKE BOARDS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853538531 DE3538531A1 (en) 1985-10-30 1985-10-30 METHOD FOR THE CONTINUOUS PRODUCTION OF CHIP, FIBER AND THE LIKE PANELS
DE3538531 1985-10-30

Publications (2)

Publication Number Publication Date
EP0220701A1 EP0220701A1 (en) 1987-05-06
EP0220701B1 true EP0220701B1 (en) 1990-08-08

Family

ID=6284775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114843A Expired - Lifetime EP0220701B1 (en) 1985-10-30 1986-10-25 Process for the continuous production of chip, fibre or similar boards

Country Status (12)

Country Link
US (1) US4946635A (en)
EP (1) EP0220701B1 (en)
JP (1) JP2635560B2 (en)
CN (1) CN1012807B (en)
AT (1) ATE55311T1 (en)
DD (1) DD250290A5 (en)
DE (2) DE3538531A1 (en)
DK (1) DK164807C (en)
ES (1) ES2017460B3 (en)
FI (1) FI84149C (en)
MX (1) MX168066B (en)
SU (1) SU1671155A3 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734180C2 (en) * 1987-10-09 1998-01-29 Kuesters Eduard Maschf Double belt press for the production of chipboard and the like
DE3800513A1 (en) * 1988-01-11 1989-07-27 Baehre & Greten Continuously operating press
DE3937421C1 (en) * 1989-11-10 1991-01-24 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover, De
US5295805A (en) * 1990-03-02 1994-03-22 Ryoka Techno Engineering & Construction Co. Rotating cylindrical treatment apparatus
CA2100320C (en) 1992-08-31 2011-02-08 Michael J. Deaner Advanced polymer wood composite
US5948524A (en) 1996-01-08 1999-09-07 Andersen Corporation Advanced engineering resin and wood fiber composite
GB2324061B (en) * 1997-04-10 2002-05-08 Findlay Alice Rosemary A moulded door skin
JP4268318B2 (en) * 2000-06-29 2009-05-27 芝浦メカトロニクス株式会社 Substrate transport apparatus and substrate transport method
DE202004015471U1 (en) 2004-10-04 2006-02-09 M. Kaindl Kommanditgesellschaft Lightweight panel and a panel with a lightweight board
JP4580736B2 (en) * 2004-11-18 2010-11-17 ユニ・チャーム株式会社 Absorbent core molding drum
ES2381296T3 (en) 2005-01-27 2012-05-25 Ecowater Systems, Llc Threaded locking mechanism between a filter head and a filter cartridge
JP5017152B2 (en) 2008-03-14 2012-09-05 株式会社コガネイ connector

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE757468A (en) * 1970-07-14 1971-03-16 Mende & Co W SYSTEM FOR CONTINUOUS MANUFACTURING OF AGGLOMERATED CHIP BOARDS
DE2034853B2 (en) * 1970-07-14 1973-09-13 Mende & Co W Continuous chipboard prodn - compacting in arcuate press gap between heated drum and ravelling belt
US3874962A (en) * 1970-10-14 1975-04-01 Berstorff Gmbh Masch Hermann Apparatus for the continuous production of thin wood-wool boards
DE2053351C3 (en) * 1970-10-30 1974-11-07 Wilhelm Mende & Co, 3371 Teichhuette Device for the production of an endless thin chipboard sheet
DE2100132A1 (en) * 1971-01-04 1972-07-13 Bison-Werke Bahre & Greten GmbH & Co KG, 3257 Springe Device for the continuous production of panels, in particular chipboard
DE2126935C3 (en) * 1971-05-29 1973-11-22 Mende & Co W Pressing process for the production of unge schhffener chipboard and device for carrying out the pressing process
DE2218074C3 (en) * 1972-04-14 1980-10-02 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Device for the continuous production of laminated chipboard sheets
US4097640A (en) * 1972-07-08 1978-06-27 Karl Kroyer St. Anne's Limited Production of fibrous sheet material
DE2360141C3 (en) * 1973-12-03 1980-06-04 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Device for the continuous production of an endless chipboard web, fibreboard web or the like
DE2710000A1 (en) * 1977-03-08 1978-09-14 Berstorff Gmbh Masch Hermann EQUIPMENT FOR THE CONTINUOUS MANUFACTURING OF CHIPBOARD, FIBERBOARD OR THE SAME

Also Published As

Publication number Publication date
CN1012807B (en) 1991-06-12
JPS62174101A (en) 1987-07-30
FI864310A0 (en) 1986-10-24
ES2017460B3 (en) 1991-02-16
DK164807B (en) 1992-08-24
SU1671155A3 (en) 1991-08-15
DK516486D0 (en) 1986-10-29
CN86107430A (en) 1987-06-03
DE3538531C2 (en) 1988-10-27
JP2635560B2 (en) 1997-07-30
DE3673321D1 (en) 1990-09-13
MX168066B (en) 1993-05-03
DD250290A5 (en) 1987-10-08
EP0220701A1 (en) 1987-05-06
DK164807C (en) 1993-01-11
ATE55311T1 (en) 1990-08-15
US4946635A (en) 1990-08-07
FI84149B (en) 1991-07-15
FI864310A (en) 1987-05-01
DE3538531A1 (en) 1987-05-07
FI84149C (en) 1991-10-25
DK516486A (en) 1987-05-01

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