WO1997028935A1 - Method of producing particle or fibre boards - Google Patents
Method of producing particle or fibre boards Download PDFInfo
- Publication number
- WO1997028935A1 WO1997028935A1 PCT/EP1997/000528 EP9700528W WO9728935A1 WO 1997028935 A1 WO1997028935 A1 WO 1997028935A1 EP 9700528 W EP9700528 W EP 9700528W WO 9728935 A1 WO9728935 A1 WO 9728935A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component
- polyol
- wood
- binder
- chips
- 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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
Definitions
- the invention relates to a process for the production of chipboard or fiberboard by hot pressing a bonded shaped mat made of wood shavings, wood fibers or other lignocellulose-containing raw materials using the polyurethane bond, in which at least a first component containing NCO groups and at least a second one Component, in particular a polyol, are used.
- the method can be used both in continuous production, ie in the pressing of a mat belt.
- a method of the type described at the outset is from the magazine FOREST PRODUCTS JOURNAL, Vol. 35, No.
- the pre-reaction is considered necessary to start the polyurethane bond even with a low glue dosage.
- a low glue dosage is generally sought for reasons of cost alone.
- the pre-reaction described begins when the two components are mixed and continues even during the application of this binder to the chips. This reaction also continues during the transport of the glued chips and the shaping of the mat.
- the polyurethane binding of the binder to the wood is delayed in the press and requires high pressing temperatures. Operational interruptions in the production of chipboard or fiberboard are particularly unpleasant when using this binder from the two components, because the reactions initiated continue and the relevant plant parts first have to be cleaned before resuming production.
- AT 270 189 discloses a process for the production of sheets or moldings by pressing, preferably hot pressing, a mass of wood chips, wood fibers or woody raw materials mixed with binder, in the production of which an isocyanate solution, that is PMDI, as a binder, incorporated is set.
- the isocyanate can also be used together with urea, melamine or phenol-formaldehyde resin as a binder, these different binders being able to be applied to the chips separately or in a mixture.
- isocyanate or solutions of isocyanate are preferably mixed or emulsified with the known other binders, such as urea, melamine and phenol-formaldehyde resin glue, by means of a stirrer in a container.
- This binder mixture is then applied to the chips.
- one or more layers are formed from a chip mass which has been treated with isocyanate or a mixture thereof with conventional binders, while the chip mass for the remaining layers is provided with the usual binders alone - without the use of isocyanate - before follow the merging of the layers into a mat and the hot pressing.
- the invention is based on the object of providing a method in which, using the polyurethane bond with the expected superior properties of the chipboard or fiberboard, a significantly reduced susceptibility to faults in the operational production process is achieved.
- this is achieved in the process of the type described in the introduction in that the at least two components of the binder are applied separately or without a noteworthy preliminary reaction in a mixture to the wood chips and / or wood fibers, so that the polyurethane bond is as late as possible in the production process and thus essentially during of hot pressing arises.
- This contact only takes place on the chips and / or fibers. This contact occurs during the transport of the chips or fibers, continues during the shaping of the mat, so that the reaction which arises thereby reaches its climax exactly at the point in time when the hot pressing of the shaped mat takes place. It is assumed that during the hot pressing the water-steam transport mechanism is advantageously used as a vehicle for the desired contact of the two components.
- the two components making up the binder can be designed variably in order to influence the properties of the wood or fiber boards.
- a fast-reacting PMDI can also be used as the first component.
- the properties of the wood and / or fiberboard can be changed within wide limits. For example, a plate with particularly good elastic properties can be produced by adding a high molecular weight, linear polyol. The temperature and cooking strength can be favored by adding short-chain triols as the second component.
- the second component in particular a polyol
- the addition of the first containing NCO Component takes place only afterwards and as late as possible in the manufacturing process.
- the comparatively early addition of a polyol in the manufacturing process is not disadvantageous, because polyols are largely insensitive to temperature and also remarkably high temperatures in the manufacturing process, for example in the manufacture of MDF boards, cannot have an adverse effect.
- the addition of this second component can thus already take place, for example, in the blow passage or even in the preparation part of the plant for the fibers.
- the first component namely the PMDI, is advantageously only released after the blow.
- a polyol and / or a polyamine can be used as the second component. Either only one polyol can be used as the second component, only one polyamine, or else mixtures of the two. Mixtures of several polyols and / or several polyamines can also be used. These individual components of the second component can also be applied separately one after the other.
- One or more natural polyols can also be used as the second component, in whole or in part.
- Natural polyols for example castor oil, soybean oil or olive oil, are, on the one hand, very inexpensive and, on the other hand, are natural products, just like wood chips and wood fibers, so that plates can be produced which consist of 97 to 99% natural raw materials.
- the first component containing NCO groups can be used with a molar excess, based on the second component.
- the first component having NCO groups can be used in an equivalence ratio of approximately 12: 1 to the second component. This works with an excess of isocyanate groups or equivalents, that is to say with isocyanate polyurethane adhesives.
- the ratio of the NCO groups of the PMDI to the OH groups of the polyol or to the NH groups of the polyamine can be varied, but is limited by a ratio of 1 to 1.
- the PMDI is fed directly into the mixing vessel and mixed there with the water and fed to the glueing nozzles of the gluing machine.
- the polyol is sprayed on in the chute of the gluing machine.
- E ⁇ chipboard is manufactured with the following properties:
- the glued chips reach the central ⁇ chicht ⁇ treuma ⁇ chine a chipboard molding line.
- the gluing quantities are adjusted so that the middle layer contains 3% glue mixture on absolutely dry wood mass and the top layer 4.5%.
- the pre-compacted chip cake is pressed at a pressing temperature of 205 ° C. with a pressing factor of 8.5 sec / mm.
- the manufactured chipboard has the following properties:
- the weight ratio PMDI to polyol is set to 1: 1.
- a natural polyol with an OH number of 160 and a molecular weight of approx. 960 is used as the polyol.
- the polyol is injected in the chute. The following properties result:
- Example 2 The procedure is as in Example 2, with the difference that 5% by weight of polyether triol was mixed into the polyether diol. Triol (hydroxyl content 11%, MW approx. 310).
- Example 1 The procedure is as in Example 1.
- the mixture from Example 4 is used as the polyol.
- Example 3 0.6 parts by weight of dry natural polyol as in Example 3 is added to the feed screw of the defibrator of an MDF system. 2.6 parts by weight of PMDI are added at the end of the blow.
- the result is an MDF board with the following properties:
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU17221/97A AU1722197A (en) | 1996-02-08 | 1997-02-06 | Method of producing particle or fibre boards |
EP97904383A EP0842020A1 (en) | 1996-02-08 | 1997-02-06 | Method of producing particle or fibre boards |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19604575.4 | 1996-02-08 | ||
DE1996104575 DE19604575A1 (en) | 1996-02-08 | 1996-02-08 | Process for the production of chipboard or fiberboard |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997028935A1 true WO1997028935A1 (en) | 1997-08-14 |
Family
ID=7784850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/000528 WO1997028935A1 (en) | 1996-02-08 | 1997-02-06 | Method of producing particle or fibre boards |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0842020A1 (en) |
AU (1) | AU1722197A (en) |
DE (1) | DE19604575A1 (en) |
WO (1) | WO1997028935A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1203648A2 (en) * | 2000-11-02 | 2002-05-08 | Wacker Polymer Systems GmbH & Co. KG | Method for the fabrication of wooden fibreboards |
DE102013103272A1 (en) * | 2013-04-02 | 2014-10-02 | Homatherm Gmbh | Process for producing a fiberboard |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19756154C1 (en) * | 1997-12-17 | 1999-10-28 | Henkel Kgaa | Moldings of wood particles and PU binders, their preparation and use |
DE19963096C1 (en) * | 1999-12-24 | 2001-05-03 | Glunz Ag | Polyurethane-bound molding, e.g. chipboard or fiberboard for insulation or wallboard, comprises applying isocyanate and polyol to separate batches of lignocellulose particles, mixing, preforming, calibration and heating |
DE102007019416A1 (en) * | 2006-07-19 | 2008-01-24 | Pfleiderer Holzwerkstoffe Gmbh & Co. Kg | Production of base material for light-weight chipboard or fibre-board, involves mixing cellulose-containing powder, e.g. corn flour, with a hardener such as poly-isocyanate and then foaming and hardening the mixture |
DE102007025801A1 (en) | 2007-06-02 | 2008-12-04 | Glunz Ag | Process for the preparation of a light flexible molded article based on lignocellulose-containing fibers |
DE102014119242A1 (en) | 2014-12-19 | 2016-06-23 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Insulating and / or soundproofing board, their use and a method for the production of insulating and / or soundproofing panels |
DE202014106187U1 (en) | 2014-12-19 | 2016-02-22 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Insulation and / or sound insulation board |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4478738A (en) * | 1979-05-29 | 1984-10-23 | Bayer Aktiengesellschaft | Self-releasing binder based on isocyanate and the use thereof in a process for the production of molded articles |
EP0173866A1 (en) * | 1984-08-15 | 1986-03-12 | Jim Walter Research Corp., | Binder composition for manufacture of fiberboard |
US4608407A (en) * | 1983-08-09 | 1986-08-26 | Bayer Aktiengesellschaft | Process for the production of compression-molded materials containing polyisocyanate binders using latent, heat activatable catalysts |
EP0522309A1 (en) * | 1991-07-10 | 1993-01-13 | Glunz Ag | Process for the manufacture of fiberboard from pellets of wood particles and isocyanate as binder |
DE4200324A1 (en) * | 1992-01-09 | 1993-07-15 | Bayer Ag | USE OF A SUGAR PRODUCT CONTAINING ISOCYANATE GROUPS AS A BINDER IN THE COMPRESSION OF SUBSTRATES FOR THE PRODUCTION OF COMPRESSED MATERIALS |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2538999C3 (en) * | 1975-09-02 | 1981-10-22 | Lignotock Verfahrenstechnik Gmbh, 1000 Berlin | Binder component for polyurethane binders |
-
1996
- 1996-02-08 DE DE1996104575 patent/DE19604575A1/en not_active Withdrawn
-
1997
- 1997-02-06 EP EP97904383A patent/EP0842020A1/en not_active Withdrawn
- 1997-02-06 WO PCT/EP1997/000528 patent/WO1997028935A1/en not_active Application Discontinuation
- 1997-02-06 AU AU17221/97A patent/AU1722197A/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4478738A (en) * | 1979-05-29 | 1984-10-23 | Bayer Aktiengesellschaft | Self-releasing binder based on isocyanate and the use thereof in a process for the production of molded articles |
US4608407A (en) * | 1983-08-09 | 1986-08-26 | Bayer Aktiengesellschaft | Process for the production of compression-molded materials containing polyisocyanate binders using latent, heat activatable catalysts |
EP0173866A1 (en) * | 1984-08-15 | 1986-03-12 | Jim Walter Research Corp., | Binder composition for manufacture of fiberboard |
EP0522309A1 (en) * | 1991-07-10 | 1993-01-13 | Glunz Ag | Process for the manufacture of fiberboard from pellets of wood particles and isocyanate as binder |
DE4200324A1 (en) * | 1992-01-09 | 1993-07-15 | Bayer Ag | USE OF A SUGAR PRODUCT CONTAINING ISOCYANATE GROUPS AS A BINDER IN THE COMPRESSION OF SUBSTRATES FOR THE PRODUCTION OF COMPRESSED MATERIALS |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1203648A2 (en) * | 2000-11-02 | 2002-05-08 | Wacker Polymer Systems GmbH & Co. KG | Method for the fabrication of wooden fibreboards |
EP1203648A3 (en) * | 2000-11-02 | 2002-06-12 | Wacker Polymer Systems GmbH & Co. KG | Method for the fabrication of wooden fibreboards |
US6998078B2 (en) | 2000-11-02 | 2006-02-14 | Wacker Polymer Systems Gmbh & Co. Kg | Process for producing wood particleboard |
DE102013103272A1 (en) * | 2013-04-02 | 2014-10-02 | Homatherm Gmbh | Process for producing a fiberboard |
DE102013103272B4 (en) * | 2013-04-02 | 2016-09-15 | Homann Holzwerkstoffe GmbH | Process for producing a sandwich fiber board |
Also Published As
Publication number | Publication date |
---|---|
EP0842020A1 (en) | 1998-05-20 |
DE19604575A1 (en) | 1997-08-28 |
AU1722197A (en) | 1997-08-28 |
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