WO1998022267A1 - Holzfaserdämmplatte - Google Patents
Holzfaserdämmplatte Download PDFInfo
- Publication number
- WO1998022267A1 WO1998022267A1 PCT/EP1997/006338 EP9706338W WO9822267A1 WO 1998022267 A1 WO1998022267 A1 WO 1998022267A1 EP 9706338 W EP9706338 W EP 9706338W WO 9822267 A1 WO9822267 A1 WO 9822267A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wood fiber
- insulation board
- fiber insulation
- binder
- board according
- Prior art date
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
Definitions
- the invention relates to an insulation board made of wood fibers, in particular for thermal insulation, whereby mats are also to be understood.
- Wood fiber boards are currently manufactured using two fundamentally different processes. On the one hand, this is the so-called wet process, according to which soft wood fiber boards and hardboard (HDF) are produced, and on the other hand, a wood fiber drying process, according to which so-called MDF or HDF boards are manufactured.
- wet process according to which soft wood fiber boards and hardboard (HDF) are produced
- HDF hardboard
- MDF or HDF boards are manufactured.
- the wood fiber board production process has in common the production of wood fibers. This is usually done in such a way that wood chips are first defibrated into wood fibers using a defibration system.
- One speaks of thermal-mechanical digestion whereby after thermal digestion the wood chips are mechanically defibrated under pressure under the influence of temperature.
- the cooked or steamed wood chips are fed to a pair of grinding disks via a screw and released after they have been shredded.
- Steam and wood fibers are usually separated in a cyclone, which come out of the refiner as a mixture due to the thermal-mechanical digestion.
- the wood fibers are mixed with liquid, usually water, glue and the like to a pulp.
- This slurry is spread out in shaping stations, usually with a long screen dewatering device, shaped and compacted and dried in a press.
- the water is partly squeezed out with ironing rollers and the remaining water is evaporated with overflow or nozzle dryers.
- the press for the production of hardboard has at least one of the press surfaces with sieve-like openings for the steam outlet.
- the moisture in the wet pulp can escape over the surface and the edges.
- the nonwoven fabric to be dried must of course remain in the press for a certain time, so that the production process is lengthy.
- the dwell time in the dryers used in the manufacture of soft wood fiber boards is very long due to the low heat transfer into the board.
- the addition of liquid the need to apply a great deal of energy to evaporate the liquid and the long residence time in the drying phase make the wet production processes for wood fiber boards comparatively uneconomical.
- the dry process has been developed. This differs from the wet process in that the fibers are glued and dried before being used for shaping. After drying, the fibers are sprinkled and, after being shaped, cured in a press which no longer has to have the evaporation openings in the press surface. The low residual moisture is evaporated here via the side edges. The dwell time of the fiber material in the drying press is therefore considerably shorter. This significantly reduces the production time after spreading. However, pre-drying of the fibers before curing is still required.
- a disadvantage of both methods described is the large amount of energy required for fiber drying, be it in the dry process after defibrating or in the wet process after shaping.
- Another disadvantage is the unfavorable water balance, especially in the wet process.
- the pulpy consistency inevitably results in a lower one in the wet process Limit for the bulk density, which cannot be undercut.
- there is an upper limit with regard to the thickness of the plates produced by the wet process since the heat is supplied only via the surfaces of the plates and from a certain thickness, at least with reasonable energy expenditure, complete drying would no longer be possible. Due to the boundary conditions, the thermal conductivity is also limited, i.e. ⁇ values> 0.045 W / mK result.
- the degree of moisture of the boards produced by the drying process must be set very precisely, otherwise tears or bursts occur on the board due to the drying process.
- Dehumidification can only take place by evaporation, so that the water in the plate is heated by the high temperature and the high pressure to a temperature above the boiling point at atmospheric pressure.
- Another disadvantage of the boards produced in the dry process is the unfavorable distribution of the binder, which usually has to be done after blower tube gluing, since otherwise an adequate board bond can no longer be guaranteed.
- only water-soluble binders can be used in both processes.
- the wood fiber boards produced according to the described and previously implemented processes are, due to the described limits, lower bulk density limit and upper thickness limit on the one hand and lower limit of the thermal conductivity on the other hand, solid boards for interior construction, furniture construction, mold construction and the like in a manner known per se.
- the known panels are unsuitable for use as a thermal insulation element.
- the present invention is based on the object of specifying a wood fiber board which is economical in terms of the parameters of energy expenditure, water consumption and time control during manufacture and in terms of density and the resulting technical properties such as thermal insulation,
- the invention proposes a wood fiber insulation board containing at least one binder mixed with wood fibers, which are applied to a molding station, shaped in terms of width and basis weight and shaped and cured after activation of the binder to form a board , wherein the plate has a bulk density ⁇ 1 50 kg / m 3 with a thermal conductivity ⁇ 0.045 W / (mx K).
- the wood fiber insulation board according to the invention falls below any lower density previously known for wood fiber boards with a massive reduction in thermal conductivity at the same time, so that it can be used excellently as a heat insulation element.
- the term "board" in connection with the invention does not exclude that the wood fiber insulation board can also have mat properties.
- Hitherto known wood fiber boards manufactured by conventional methods have a bulk density above 1 70 kg / m 3 and thermal conductivities around 0.05 to 0.06 W / (mx K). Compressive stresses are known to be above 85 kN / m 2 and the modulus of elasticity is above 1 million N / m 2 . Tear strengths are above 20 kN / m 2 .
- the wood fiber insulation board according to the invention has a bulk density ⁇ 1 50 kg / m 3 with a thermal conductivity ⁇ 0.045 W / (mx K).
- the tear-off strength is particularly advantageously ⁇ 10 kN / m 2 and the compressive stress ⁇ 65 kN / m 2 , which results in the required softness for thermal insulation elements with sufficient tear-off strength.
- the pressure modulus is particularly advantageously 650,000 N / m 2 .
- the thermal insulation board according to the invention can be produced in an extremely economical manner with slight modification of previously known processes and has excellent thermal insulation properties.
- the fact that the fibers are unchanged in terms of moisture content means that no active measures need to be taken to set a specific moisture level. If the fibers are stored or otherwise kept ready after defibration and there are slight changes in moisture content, this is of no importance for the implementation of the method.
- the binders be mixed dry with the fibers. This results in a very good distribution.
- prepresses can be carried out in order to set the desired density ratios with great accuracy.
- the binding agents are advantageously activated by means of steam which flows through the scattered fiber material strand. This flow ensures complete binder activation.
- the invention proposes in a particularly advantageous manner that a drying medium flows through the spread and preformed fiber material. It is advantageously proposed to let hot air flow through the main surfaces of the preformed material. During the flow, a pressing process can advantageously be used to calibrate the wood fiber board.
- the invention provides a simple, economical method which can be controlled very precisely with regard to the attainment of technological properties, with which insulating boards with densities far below 1,50 kg / m 3 can be produced, that is to say up to around 60 kg / m 3 .
- virtually any thickness can be created if through-flow drying takes place.
- the board can be produced with natural or near-natural binders such as lignin, damar resins and the like, so that water-insoluble binders can also be used.
- Thermal conductivities ( ⁇ ) can be set below 0.040 W / mK.
- the pressure capacities can be set very high, so that the panels produced by the method according to the invention can also be used for insulating walk-in or other load-bearing areas.
- the process according to the invention is extremely economical compared to the conventionally known wood fiber board production processes, enables the production of a board type which is completely new in terms of thickness, density and technological properties and can be varied from an ecological point of view.
- the fiberboard produced by the described method differs considerably from previously known fiberboard.
- This plate can be varied widely in terms of density and can also assume very low densities.
- very large thicknesses can be set become.
- the insulation properties can be set very precisely, as can the compressive strength properties.
- Figure 1 is a flow chart to explain an embodiment of the manufacturing process.
- Wood chips 1 are subjected to fiberization 2 in a manner known per se, mechanical shredding of the wood chips 1 taking place under pressure and temperature after thermal digestion.
- refiner 2 the wood chips 1 are fed to a pair of grinding disks via a screw and are applied after the defibrating.
- the steam is then discharged in station 3, which can usually be done using a cyclone in which the steam and wood fibers are separated.
- the fibers are then stored in a fiber storage 4.
- a belt scale 5 By means of a belt scale 5, the required amounts of wood fiber are recorded, which are fed from the fiber storage 4 to a mixer 1 1.
- binders A, B and C are fed from stocks 6, 7 and 8.
- the binder quantities are recorded by means of belt scales 9; if necessary, individual binders can also be processed further, for example within a fine mill 10.
- the number of binders and the type of further processing are given only by way of example and can be varied as required. Other additives can also be added at this point.
- the refiner-moist wood fibers are mixed with the necessary binders.
- the material is scattered and shaped in a spreading and forming station 12. Forming is understood to mean, among other things, the formation of side edges, uniform spreading and, if necessary, pre-pressing.
- the binder is activated by means of steam, hot air or other activation media. This is preferably done by means of flow.
- the dryer zone 14 there is a pre-pressing and a drying of the plates formed. This can be done, for example, by means of hot air flow, for which purpose a press can be used at this point, which has at least one of the press surfaces in the form of a screen.
- the dried plate is then formatted or assembled in a station 1 5.
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)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52317898A JP2001506549A (ja) | 1996-11-15 | 1997-11-13 | 木材繊維からなる断熱プレート |
EP97950187A EP0880430A1 (de) | 1996-11-15 | 1997-11-13 | Holzfaserdämmplatte |
CA002243078A CA2243078C (en) | 1996-11-15 | 1997-11-13 | Wood fiber insulating panel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19647240.7 | 1996-11-15 | ||
DE1996147240 DE19647240B4 (de) | 1996-11-15 | 1996-11-15 | Holzfaserplatte und Verfahren zu ihrer Herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998022267A1 true WO1998022267A1 (de) | 1998-05-28 |
Family
ID=7811754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/006338 WO1998022267A1 (de) | 1996-11-15 | 1997-11-13 | Holzfaserdämmplatte |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0880430A1 (de) |
JP (1) | JP2001506549A (de) |
DE (1) | DE19647240B4 (de) |
WO (1) | WO1998022267A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10042534A1 (de) * | 2000-08-30 | 2002-03-28 | Kronotec Ag | Faserplatte |
DE10066343B4 (de) * | 2000-06-02 | 2013-01-03 | Steico Se | Verfahren zur Herstellung einer flexiblen Holzfaserdämmstoffmatte und nach diesem Verfahren hergestellte Dämmstoffmatte |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19949975B4 (de) * | 1999-10-08 | 2005-04-28 | Univ Dresden Tech | Verfahren zur Herstellung von biologisch abbaubaren, plattenförmigen Werkstoffen und Formteilen |
DE19963096C1 (de) | 1999-12-24 | 2001-05-03 | Glunz Ag | Verfahren zur Herstellung Polyurethan-gebundener Formkörper aus Lignocellulose-haltigen Partikeln |
US7405248B1 (en) | 2000-09-13 | 2008-07-29 | Homatherm Ag | Plate-shaped moulding elements based on natural fibres and method for the production thereof |
DE10315997A1 (de) * | 2003-04-07 | 2004-12-02 | Fritz Egger Ges. m.b.H. & Co. | Spanplatte sowie Verfahren zur Herstellung einer Spanplatte |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3641466A1 (de) * | 1986-12-04 | 1988-06-16 | Uwe Welteke | Verfahren und vorrichtung zur herstellung von faserplatten |
DE3641465A1 (de) * | 1986-12-04 | 1988-06-16 | Uwe Welteke | Verfahren zur herstellung von waermedaemmplatten aus fasermaterialien |
DE4211888A1 (de) * | 1992-04-09 | 1993-10-14 | Wulf V Dr Bonin | Ganzpflanzen-Formteile |
DE4322907A1 (de) * | 1993-07-09 | 1995-01-12 | Udar Ges Fuer Umweltengineerin | Verfahren zur Herstellung von Platten und Formkörpern mit hohem Wärmedämm- und Feuerhemmwert und Vorrichtung zur Durchführung |
WO1996014970A1 (en) * | 1994-11-11 | 1996-05-23 | Valtion Teknillinen Tutkimuskeskus | Wood-based form parts and a method for the preparation thereof |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1089540B (de) * | 1956-06-28 | 1960-09-22 | Weyerhaeuser Timber Company | Verfahren zur Gewinnung einer Matte aus gegebenenfalls mit Binde-mitteln versetzten Lignozellulosefasern fuer die Herstellung von Holzfaserplatten od. dgl. |
DE1212297B (de) * | 1961-04-29 | 1966-03-10 | Max Himmelheber Dipl Ing | Verfahren zur Herstellung von Holzwerkstoffplatten und -formkoerpern |
DE2201459A1 (de) * | 1972-01-13 | 1973-07-19 | Homann Gmbh Fritz | Verfahren zum herstellen von platten aus holzfasern |
SE442724B (sv) * | 1982-06-07 | 1986-01-27 | Sunds Defibrator | Sett vid tillverkning av fiberskivor enligt den torra metoden |
SE455001B (sv) * | 1986-10-03 | 1988-06-13 | Rune Simonson | Forfarande vid tillverkning av produkter innehallande trefibrer |
DE3641464A1 (de) * | 1986-12-04 | 1988-06-16 | Uwe Welteke | Naturfasern enthaltende waermedaemmplatte sowie verfahren und vorrichtung fuer ihre herstellung |
AT396137B (de) * | 1991-05-06 | 1993-06-25 | Leitgeb Ag | Holzfaserdaemmplatte |
DE4423632A1 (de) * | 1994-07-06 | 1996-01-11 | Siempelkamp Gmbh & Co | Verfahren zum Vorwärmen von Streugut auf eine vorgebbare Vorwärmtemperatur im Zuge der Herstellung von Holzwerkstoffplatten |
DE4436981A1 (de) * | 1994-10-06 | 1996-04-11 | Hartmut Faerber | Leichtbaukörper geringer Wärmeleitfähigkeit |
-
1996
- 1996-11-15 DE DE1996147240 patent/DE19647240B4/de not_active Expired - Fee Related
-
1997
- 1997-11-13 WO PCT/EP1997/006338 patent/WO1998022267A1/de not_active Application Discontinuation
- 1997-11-13 JP JP52317898A patent/JP2001506549A/ja active Pending
- 1997-11-13 EP EP97950187A patent/EP0880430A1/de not_active Ceased
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3641466A1 (de) * | 1986-12-04 | 1988-06-16 | Uwe Welteke | Verfahren und vorrichtung zur herstellung von faserplatten |
DE3641465A1 (de) * | 1986-12-04 | 1988-06-16 | Uwe Welteke | Verfahren zur herstellung von waermedaemmplatten aus fasermaterialien |
DE4211888A1 (de) * | 1992-04-09 | 1993-10-14 | Wulf V Dr Bonin | Ganzpflanzen-Formteile |
DE4322907A1 (de) * | 1993-07-09 | 1995-01-12 | Udar Ges Fuer Umweltengineerin | Verfahren zur Herstellung von Platten und Formkörpern mit hohem Wärmedämm- und Feuerhemmwert und Vorrichtung zur Durchführung |
WO1996014970A1 (en) * | 1994-11-11 | 1996-05-23 | Valtion Teknillinen Tutkimuskeskus | Wood-based form parts and a method for the preparation thereof |
Non-Patent Citations (1)
Title |
---|
"Karlebo Handbok, utgava 12", 1977, MASKINAKTIEBOLAGET KARLEBO, STOCKHOLM, SWEDEN, XP002061220 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10066343B4 (de) * | 2000-06-02 | 2013-01-03 | Steico Se | Verfahren zur Herstellung einer flexiblen Holzfaserdämmstoffmatte und nach diesem Verfahren hergestellte Dämmstoffmatte |
DE10042534A1 (de) * | 2000-08-30 | 2002-03-28 | Kronotec Ag | Faserplatte |
Also Published As
Publication number | Publication date |
---|---|
JP2001506549A (ja) | 2001-05-22 |
DE19647240A1 (de) | 1998-05-28 |
EP0880430A1 (de) | 1998-12-02 |
DE19647240B4 (de) | 2005-06-09 |
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