WO1997040968A1 - Procede de preparation de bois agglomere - Google Patents

Procede de preparation de bois agglomere Download PDF

Info

Publication number
WO1997040968A1
WO1997040968A1 PCT/FI1997/000249 FI9700249W WO9740968A1 WO 1997040968 A1 WO1997040968 A1 WO 1997040968A1 FI 9700249 W FI9700249 W FI 9700249W WO 9740968 A1 WO9740968 A1 WO 9740968A1
Authority
WO
WIPO (PCT)
Prior art keywords
wood
pressing
during
pressed
drying
Prior art date
Application number
PCT/FI1997/000249
Other languages
English (en)
Finnish (fi)
Inventor
Ari Hottinen
Pekka Hottinen
Original Assignee
Puristepuu Hottinen Oy
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 Puristepuu Hottinen Oy filed Critical Puristepuu Hottinen Oy
Priority to AU23900/97A priority Critical patent/AU2390097A/en
Publication of WO1997040968A1 publication Critical patent/WO1997040968A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing

Definitions

  • the subject of this invention is a method for the preparation of pressed wood, in which method, damp or new wood is heated and pressed during the compression stage, mainly with a constant pressure between permeable pressing surfaces which permit gases to pass through them.
  • the purpose of this invention is to introduce a method which eliminates the drawbacks in the present methods.
  • the purpose of the invention is to introduce a method which, when used, will facilitate the preparation of this kind of wood products in large batch quantities on an industrial scale.
  • a further purpose of the invention is to introduce a method which, when used, will form the fewest possible splits in the wood products.
  • the purpose of the invention is achieved with a method in which, during the pre-heating time and at least during the early stages of the pressing, moisture is added to the air surrounding the wood continually, or at suitable intervals, to even out the dampness of the wood.
  • moisture is added during the warming and pressing stages, the surface layers of the wood product do not essentially dry quicker than the internal parts, so that the wood dries evenly and does not cause splits to form.
  • the pressing pressure of the wood product is 5-30 kg/cm 2 and the wood product is pressed slowly into the desired form taking about 7-15 hours. This slow pressing results in the wood drying evenly.
  • the wood product is pressed in stages to the desired form, during which the pressing is halted at determined intervals.
  • the moisture between the pressing tool and the wood material can evaporate better.
  • the wood product is generally cooled after the drying and pressing either by allowing it to cool or by cooling it by mechanically.
  • the pressing pressure is maintained during the cooling period at the same level as during the drying time. In this way the wood cannot twist while drying.
  • new wood which has been felled no more than 10 days before use, is advantageously used as the wood product.
  • New wood is still naturally damp neither have its outer layers essentially managed to dry compared with the inner layers so that the wood has not generally split. This also depends on the environmental conditions such that it may be possible to advantageously use such wood products which have been felled 7 days at the most prior to use.
  • Figure 1 shows, diagrammatically, a part of the equipment used in an arrangement of the method and viewed from the side, and figure 2 shows the part of the equipment on a larger scale.
  • the equipment according to the figures is a multi-layer press 3, and it can be formed from one or several chambers which can be closed airtight, or the equivalent. In the chambers are located the surfaces 2. which move relative to each other and on which the wood product 1 is placed.
  • the number of surfaces, i.e. the press surfaces, can vary with different equipment and there can be, for example. 15-50 surfaces and advantageously, 25-50.
  • the equipment includes hydraulic presses 5 which can be either side of the surfaces 2 or only on one side.
  • the surfaces according to figure 2 are made from two perforated surfaces 6 and the support parts 7 between them. There are air ducts 4 between the perforated surfaces.
  • New wood is used which is no more than 7 days old and which has not been allowed to dry on the surface.
  • the wood product 1 is placed on the surfaces 2 and initially pre-heated. During the pre-heating the temperature is raised using air and steam to around 100-120°C. Air and steam are blown through the air ducts 4 during the pre-heating period. The duration of the pre-heating depends on the thickness of the wood material and is about 2-5 hours. The relative humidity of the air should be over 100%.
  • the press pressure is applied to the raw-material, which is about 5-30 kg/cm 2 .
  • the press pressure is achieved by moving the presses 5 relative to the surfaces and the surfaces 2 relative to each other so that they press against each other.
  • the press pressure is maintained at the same level throughout the pressing stage.
  • the press pressure depends on the wood material being used as well as the thickness of the wood material. When thin material is being used a lower press pressure must be used than when thicker material is being pressed.
  • the normal temperature used during the drying and pressure heating time is around 120- 160°C.
  • the press pressure can be divided into stages, i.e. the press hydraulic cylinder and the surfaces are opened when required at regular intervals, for example, around 10-60 minute intervals. This time depends on the wood material and the progress of the process.
  • the air humidity is monitored constantly and maintained at the desired level since the humidity must not fall too quickly in different wood layers. If this happens, increase the moisture via the air ducts. This should be carried out especially during the early stages of the drying process. Press stops are used in the equipment which prevent the hydraulic cylinders and surfaces from pressing together beyond a determined distance. The press stops are measured such that the surface is against the stop when the wood is sufficiently dry and movement ceases.
  • the drying and pressing temperature during the final stages is raised to around 150-200°C. In this way it is easy and simple to stain the wood.
  • the drying time is about 7- 15 hours.
  • the wood material is cooled. During the cooling time the press pressure is maintained at the same level as during the drying time. Cooling continues until the temperature of the wood material has fallen below 40°C. Cooling generally lasts around 1-4 hours and the total processing time is about 10-24 hours.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

Procédé de préparation de bois aggloméré qui consiste à chauffer et à comprimer du bois humide ou frais (1) pendant le stade de compression, principalement avec une pression constante entre des surfaces (2) de pression perméables qui permettent aux gaz de passer à travers lesdites surfaces. Selon le procédé de la présente invention, pendant la phase de préchauffage, et au moins pendant les premiers stades du pressage, on ajoute de l'humidité à l'air entourant le bois, en continu ou à des intervalles appropriés, pour égaliser l'humidité du bois.
PCT/FI1997/000249 1996-04-25 1997-04-25 Procede de preparation de bois agglomere WO1997040968A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU23900/97A AU2390097A (en) 1996-04-25 1997-04-25 Method for the preparation of pressed wood

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI961768A FI97961C (fi) 1996-04-25 1996-04-25 Menetelmä puristepuun valmistamiseksi
FI961768 1996-04-25

Publications (1)

Publication Number Publication Date
WO1997040968A1 true WO1997040968A1 (fr) 1997-11-06

Family

ID=8545907

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000249 WO1997040968A1 (fr) 1996-04-25 1997-04-25 Procede de preparation de bois agglomere

Country Status (3)

Country Link
AU (1) AU2390097A (fr)
FI (1) FI97961C (fr)
WO (1) WO1997040968A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
AU732280B2 (en) * 1996-10-04 2001-04-12 Mywood Corporation Hydrostatic compression forming for wood and novel ligneous material therefrom
WO2002065040A1 (fr) * 2001-02-09 2002-08-22 Hitwood Oy Procede de traitement et de sechage du bois
NL1023232C2 (nl) * 2003-04-22 2004-10-26 Franciscus Antonius Ma Heijden Werkwijze voor het produceren van massief houten planken of balken.
WO2005049291A1 (fr) * 2003-11-21 2005-06-02 Teknocomp Oy Procede et appareil de traitement du bois ou de produits ligneux
EP1684955A1 (fr) * 2003-11-21 2006-08-02 Teknocomp OY Appareil de traitement du bois ou de produits ligneux

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233752A (en) * 1979-04-06 1980-11-18 Kleinguenther Robert A Apparatus and process for treating wood and fibrous materials
EP0460235A1 (fr) * 1989-12-25 1991-12-11 Hisaka Works Limited Procede et appareil de traitement du bois
WO1994026485A1 (fr) * 1993-05-18 1994-11-24 Valtion Teknillinen Tutkimuskeskus Procede de sechage et de compression pour la mise en forme du bois
EP0673732A1 (fr) * 1993-07-12 1995-09-27 Ibiden Co, Ltd. Bois de construction stratifie, procede et dispositif de production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233752A (en) * 1979-04-06 1980-11-18 Kleinguenther Robert A Apparatus and process for treating wood and fibrous materials
EP0460235A1 (fr) * 1989-12-25 1991-12-11 Hisaka Works Limited Procede et appareil de traitement du bois
WO1994026485A1 (fr) * 1993-05-18 1994-11-24 Valtion Teknillinen Tutkimuskeskus Procede de sechage et de compression pour la mise en forme du bois
EP0673732A1 (fr) * 1993-07-12 1995-09-27 Ibiden Co, Ltd. Bois de construction stratifie, procede et dispositif de production

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU732280B2 (en) * 1996-10-04 2001-04-12 Mywood Corporation Hydrostatic compression forming for wood and novel ligneous material therefrom
FR2781180A1 (fr) * 1998-07-17 2000-01-21 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2000004328A1 (fr) * 1998-07-17 2000-01-27 Fours Et Bruleurs Rey Reacteur de retification du bois
WO2002065040A1 (fr) * 2001-02-09 2002-08-22 Hitwood Oy Procede de traitement et de sechage du bois
US6857201B2 (en) 2001-02-09 2005-02-22 Oy Arboreo Technologies Ltd. Method for treating and drying of wood
NL1023232C2 (nl) * 2003-04-22 2004-10-26 Franciscus Antonius Ma Heijden Werkwijze voor het produceren van massief houten planken of balken.
WO2005049291A1 (fr) * 2003-11-21 2005-06-02 Teknocomp Oy Procede et appareil de traitement du bois ou de produits ligneux
EP1684955A1 (fr) * 2003-11-21 2006-08-02 Teknocomp OY Appareil de traitement du bois ou de produits ligneux

Also Published As

Publication number Publication date
FI961768A0 (fi) 1996-04-25
FI97961B (fi) 1996-12-13
AU2390097A (en) 1997-11-19
FI97961C (fi) 1997-03-25
FI961768A (fi) 1996-12-13

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