EP0172930A1 - Procédé et dispositif pour la fabrication de panneaux de particules de bois - Google Patents

Procédé et dispositif pour la fabrication de panneaux de particules de bois Download PDF

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Publication number
EP0172930A1
EP0172930A1 EP84110158A EP84110158A EP0172930A1 EP 0172930 A1 EP0172930 A1 EP 0172930A1 EP 84110158 A EP84110158 A EP 84110158A EP 84110158 A EP84110158 A EP 84110158A EP 0172930 A1 EP0172930 A1 EP 0172930A1
Authority
EP
European Patent Office
Prior art keywords
steam
period
press
during
compression
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
Application number
EP84110158A
Other languages
German (de)
English (en)
Other versions
EP0172930B1 (fr
Inventor
Michael N. Taylor
Timothy H. Reid
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.)
Weyerhaeuser Co
Original Assignee
Weyerhaeuser Co
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 to US06/599,599 priority Critical patent/US4517147A/en
Application filed by Weyerhaeuser Co filed Critical Weyerhaeuser Co
Priority to EP84110158A priority patent/EP0172930B1/fr
Priority to AT84110158T priority patent/ATE38177T1/de
Publication of EP0172930A1 publication Critical patent/EP0172930A1/fr
Application granted granted Critical
Publication of EP0172930B1 publication Critical patent/EP0172930B1/fr
Expired legal-status Critical Current

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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
    • B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat

Definitions

  • Precautions have been taken to ensure that high-energy steam jets that destroy the pressed material mats do not escape from the steam openings.
  • the pressed material mats can be scattered loosely or have already undergone preparatory compaction, which does not affect the precompaction belonging to the invention.
  • the known generic method (DE-PS 12 76 912, Weyer Reifen) works with a uniform, uninterrupted damping period and introduces superheated steam into the mat. This water vapor emerges from the edges of the mat. The material to be pressed is thereby plasticized. Then the further supply of water vapor and thus the damping period are ended. The plasticized material to be pressed is subjected to final compression without further supply of water vapor when the press plates are moved together into their end position and cured in this state between the press plates held in the end position. Then the plate press is opened again.
  • the uninterrupted damping time span thus extends over various compression states of the material to be pressed, which is subjected to pre-compression and final compression of the vapor deposition. Since saturated water vapor is used, condensation can form very easily. The finished wood-based panels are therefore often impaired by nests of reduced quality, which are based on the fact that either air nests remain in the pressed material or condensation has occurred.
  • the invention has for its object to carry out the generic method so that wood-based panels with nests of reduced quality can no longer arise, regardless of whether you work with superheated or saturated steam.
  • the invention is further based on the object of specifying a system with which the method according to the invention can be carried out simply and reliably.
  • the invention teaches from a procedural point of view that the damping period is interrupted by a rinsing / pressing period in which the water vapor emerges from the steam openings of the one press plate, flows through the pre-compressed material mat in the thickness direction, and via the steam openings of the other, from the water vapor source switched off press plate is discharged, that afterwards the press plates are moved into the end position and the water vapor supply to the final compressed mat is continued via the steam openings of both press plates for the remainder of the damping period, and that during the last pressing period the mat is pressed over at least one of the two Press plates and their steam openings are exposed to the action of a vacuum and thereby dried, for which purpose the device for supplying the water vapor to a vacuum source instead of to a steam generator is closed.
  • the mat to be pressed is filled with the water vapor, as it were, until saturation.
  • the invention is based on the knowledge that the shortcomings of the known generic procedure are based on the fact that the water vapor is only discharged via the edge of the pre-compressed or end-compressed mat. In this way, small or larger air pockets in the pressed material cannot be avoided, which are found in the finished wood-based panel as nests of reduced quality.
  • condensate once it has formed, can at least not be evaporated and removed again to a sufficient extent. This also creates nests of reduced quality in the finished wood-based panel. All this applies in particular when it comes to pressed material mats, the composition of which allows water vapor to flow through, but not easily flow through.
  • any air is removed from the pressed material mat without difficulty during the rinsing pressing period by intensive cross-rinsing of the pre-compressed pressed material mat in the thickness direction and consequently a quality impairment based on air pockets is eliminated.
  • condensate forms as part of the measures according to the invention, this is also removed after switching off the water vapor supply, or water vapor which is formed from this condensate by post-evaporation is reliably removed by transverse transport in the thickness direction of the material to be pressed, or the wood-based panel formed therefrom, thereby that the pressed material mat or the wood-based panel that is formed is exposed to the action of the negative pressure.
  • the effect of the negative pressure can easily be correspondingly long because of the last pressing period be judged. As a result, it is ensured that high-quality wood-based panels are produced, the quality of which is not impaired by non-hardened nests.
  • the method according to the invention can be further developed and also optimized in various ways.
  • the invention teaches that the press plates are slowly moved further together in contact with the material to be pressed during the first section of the damping period and during the rinsing / pressing period. In this way, wood-based panels can be achieved whose surfaces easily meet all quality requirements.
  • the steam supply can be continued continuously through the steam openings of both press plates during the final compression pressing period. It is advisable to connect the pressed material mat to the atmosphere via both press plates and their steam openings during a relaxation period before it is exposed to the action of negative pressure in the last pressing period.
  • a preferred embodiment of the invention is characterized in this context in that the final compacted mat is treated for the remainder of the damping period with steam at a vapor pressure which is higher than the steam pressure of the steam with which the precompressed mat was treated.
  • a preferred embodiment of the invention which is characterized by simplicity and operational reliability and stability of the process control, characterized in that working with condensable water vapor, and that the water vapor during the first portion of the damping period and during the rinsing Preßzeitabiteses in the vorver - compacted Pressed material mat brought to condensation and the temperature in the pressed material mat is thereby homogeneously adjusted to a temperature of about 100 to 135 ° C.
  • the steaming press plates 1, 2 have a large number of steam openings 8, 9 on the pressing material mat side. These steam openings 8, 9 can be of a fine size Schige sieve made of metal or plastic, which was not shown. 1 was a detail of a pressed material mat 10 to be compressed.
  • the steaming press plates 1, 2 are heated via special heating channels 11, which have been indicated in FIG. 2. The heating medium which flows through these heating channels 11 cannot escape from the steam openings 8, 9.
  • the steam which emerges from the steam openings 8, 9 is introduced into the central steam duct 12, from which distribution ducts 13 extend, into which the steam openings 8 and 9, in turn, open.
  • the pressed material mat 10 is made of chip and / or fiber material and a binder. According to the method according to the invention, a high-quality wood-based panel is produced from such a pressed material mat 10, namely by pressing the pressed material mat 10 over a predetermined pressing time t divided into several sections and through Cure using water vapor. This takes place between the heated evaporation press plates 1, 2.
  • the pressed material mat 10 is introduced between the evaporation press plates 1, 2 and the evaporation press plates 1, 2 are then partially compressed in a first precompression pressing time period t 0 t 1 moved up to a pre-compression position V, after which the water vapor is introduced into the pressed material mat 10 through the steam openings 8, 9 of both steaming press plates 1, 2 during a damping time period t 1 t 4 and furthermore in a final compression pressing time period t 3 t x the Steaming presses plates 1, 2 are moved together with further compression of the pressed material mat 10 into a final compression position E defining the wood material panel thickness and the pressed material mat 10 is cured in this final compression position E of the vaporization press plate 1 in a pressing time period t S t 6 without further steam supply. It is understood that a period t 6 t 7 follows in which the negative pressure is released so that the plate press can be opened.
  • FIG. 3 In this graphical representation, the time, in seconds, is plotted as the abscissa.
  • the left ordinate in FIG. 3 shows the steam pressure in bar, the right one shows the distance between the upper steaming press plate 1 and the lower one.
  • the solid curve K 1 in Figure 3 shows the distance of the upper vapor deposition - Press plate 1 from the lower vapor deposition press plate 2 in millimeters.
  • the dashed curve K 2 shows the steam pressure in the lower steam press plate 2 in bar.
  • the dash-dotted curve K 3 shows the steam pressure in the upper steam press plate 1 in bar.
  • the steaming press plates 1, 2 are moved into the final compression position E and the steam supply to the final compressed material mat 10 is continued via the steam openings 8, 9 of both steaming press plates 1, 2 for the rest of the steaming period t 1 t 4 .
  • the pressed material mat 10 is exposed to the action of a negative pressure via both steaming press plates 1, 2 and their steam openings 8, 9, and is thereby dried, for which purpose the device 4 for supplying the water vapor (instead of to a steam generator) is connected to a vacuum source 14.
  • the damping time period t 1 t 4 is interrupted in this way by the rinsing pressing time section t 2 t 3 in two sections t 1 t 2 and t 3 t 4 .
  • the first section t 1 t 2 of the damping period t 1 t 4 defines a time in which the pre-compressed mat 10 is treated with the water vapor.
  • the second section t 3 t 4 of the damping period t 1 t 4 defines a time in which the final compressed material mat 10 is treated with the water vapor, the steam supply also taking place during the final compression pressing period t 3 t X , which in this respect is the second section of the Damping period t 3 t 4 is to be attributed.
  • Fig. 3 can be seen from the falling tendency of the curve section 18 that the vaporization press plates 1, 2 during the first section t l t 2 of the damping period t 1 t 4 and during the rinsing press period t 2 t 3 the mat 10 keeping contact, slowly further together will drive.
  • the pressure is relaxed, namely by the fact that the material to be pressed 10 is connected to the atmosphere via both steaming press plates 1, 2 and their steam openings 8, 9 during a pressure-relaxation period t 4 t 5 becomes.
  • the final compressed mat 10 is treated with a water vapor during the remainder of the damping period t 3 t 4 , the pressure of which is higher than the pressure of the water vapor with which the pre-compressed mat 10 is treated.
  • the device 4 for supplying the water vapor has a branch line 15 which can be connected to both steaming press plates 1, 2 via outlet valves 16 , wherein the branch line 15 via a branching valve arrangement 17 during the rinsing pressing period t2 t3 for a steaming press plate 1 as well rend of the relaxation pressing period t 4 t 5 for both press plates 1, 2 to the surrounding atmosphere and during the last pressing period t s t 6 for both evaporation press plates 1, 2 can be connected to a vacuum source 14.
  • the press plate control device 6 and the evaporation control device 7 are coupled.
  • the arrangement is such that the vapor deposition control device 7 also controls the steam supply during the rinsing pressing period t 2 t 3 and the relaxation during the relaxation pressing period t 4 t 5 and the vacuum treatment during the pressing period t 5 t 6 .
  • the press plate control device 6 supplies control signals to the vaporization control device 7, which vaporization control device 7 performs the specified steam supply measures during the first section t 1 t 2 of the damping period t 1 t 4 and the rest t 3 t 4 of the damping period t 1 t 4 .
  • the arrangement is such that the press plate control device 6 and the evaporation control device 7 can be controlled between the precompression position V and the final compression position E and, if appropriate, thereafter by a program.
  • the graphical representation of FIG. 3 relates in detail to the production of special wood-based panels from specially constructed pressed-material mats 10. These are pressed-good mats or wood-based panels of the structure specified in claim 7.
  • the damping time period t 1 t 4 is set to a maximum of two thirds of the pressing time t, the first section t 1 t 2 of the damping time period t 1 t 4 is less than 10 seconds, preferably about 5 seconds, until the start of the rinsing pressing period t 2 t 3 , the rest of the damping period t 1 t 4 is shorter than the difference between the damping period t 1 t 4 minus the first section t l t 2 of the damping period t 1 t 4 .
  • the data in the table relate to the production of a chipboard with a conventional chip material and urea-formaldehyde glue, namely 8 and 9% by weight, moisture of the raw mat about 8% by weight.
  • the bulk density was 390 kg / m 3 .
  • the values P 1 , P 2 . P 3 and P indicate the distances of the press plate in millimeters, Sp 1 , Sp 2 , S P3 and Sp 4 the steam pressures in bar. In the middle of the table you can find the time spans in seconds. On the left is the final density of the finished board.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP84110158A 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois Expired EP0172930B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/599,599 US4517147A (en) 1984-02-03 1984-04-13 Pressing process for composite wood panels
EP84110158A EP0172930B1 (fr) 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois
AT84110158T ATE38177T1 (de) 1984-08-25 1984-08-25 Verfahren und anlage zur herstellung einer holzwerkstoffplatte.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US57678684A 1984-02-03 1984-02-03
US06/599,599 US4517147A (en) 1984-02-03 1984-04-13 Pressing process for composite wood panels
EP84110158A EP0172930B1 (fr) 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois

Publications (2)

Publication Number Publication Date
EP0172930A1 true EP0172930A1 (fr) 1986-03-05
EP0172930B1 EP0172930B1 (fr) 1988-10-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110158A Expired EP0172930B1 (fr) 1984-02-03 1984-08-25 Procédé et dispositif pour la fabrication de panneaux de particules de bois

Country Status (2)

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US (1) US4517147A (fr)
EP (1) EP0172930B1 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE4118058C1 (en) * 1991-06-01 1992-05-27 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De Mfg. wooden chip or fibre board - subjecting to underpressure during pressing time according to difference between preset equalising and evacuated moisture levels
US6129871A (en) * 1996-05-31 2000-10-10 Yamaha Corporation Manufacturing method for a wood board
US7220375B2 (en) 2003-08-11 2007-05-22 Dieffenbacher Gmbh + Co. Kg Method and single or multiple platen press for the manufacture of wood material boards

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US5185114A (en) * 1986-11-14 1993-02-09 Kurt Held Method for producing processed wood material panels
DE3804416A1 (de) * 1988-02-10 1989-08-24 Kiss G H Gitterdaempfung
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CN104775594B (zh) 2010-05-10 2017-09-22 佩尔戈(欧洲)股份公司 地板组件
CN102009427B (zh) * 2010-09-27 2012-12-12 南京林业大学 一种速生材片状层积结构材的制作方法
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CN112096860B (zh) * 2020-01-16 2023-02-28 宁波海山克尔铃密封件有限公司 一种薄板截面粘接密封垫及其制造工艺和装置
US20220371219A1 (en) * 2021-05-20 2022-11-24 Washington State University Thermally modified composite wood-strand products for construction and other applications
KR20230020689A (ko) * 2021-08-04 2023-02-13 현대모비스 주식회사 리얼우드 시트를 구비한 차량용 크래쉬 패드 제작용 우드 프리포밍 장치

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US3891738A (en) * 1972-11-10 1975-06-24 Canadian Patents Dev Method and apparatus for pressing particleboard
DE2742250A1 (de) * 1976-09-23 1978-03-30 Hawker Siddeley Canada Ltd Verfahren und vorrichtung zur herstellung von pressplatten
US4393019A (en) * 1981-11-30 1983-07-12 The United States Of America As Represented By The Secretary Of Agriculture Method of pressing reconstituted lignocellulosic materials

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DE4118058C1 (en) * 1991-06-01 1992-05-27 G. Siempelkamp Gmbh & Co, 4150 Krefeld, De Mfg. wooden chip or fibre board - subjecting to underpressure during pressing time according to difference between preset equalising and evacuated moisture levels
US6129871A (en) * 1996-05-31 2000-10-10 Yamaha Corporation Manufacturing method for a wood board
US7220375B2 (en) 2003-08-11 2007-05-22 Dieffenbacher Gmbh + Co. Kg Method and single or multiple platen press for the manufacture of wood material boards

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EP0172930B1 (fr) 1988-10-26
US4517147A (en) 1985-05-14

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