WO2002038676A1 - Method of making a finished product - Google Patents

Method of making a finished product Download PDF

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Publication number
WO2002038676A1
WO2002038676A1 PCT/IB2001/002108 IB0102108W WO0238676A1 WO 2002038676 A1 WO2002038676 A1 WO 2002038676A1 IB 0102108 W IB0102108 W IB 0102108W WO 0238676 A1 WO0238676 A1 WO 0238676A1
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WO
WIPO (PCT)
Prior art keywords
resin
feedstock
inclusive
lignocellulosic material
finished product
Prior art date
Application number
PCT/IB2001/002108
Other languages
French (fr)
Inventor
Michael Windsor Symons
Original Assignee
Balmoral Technologies (Proprietary) Limited
Windsor Technologies Limited
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 Balmoral Technologies (Proprietary) Limited, Windsor Technologies Limited filed Critical Balmoral Technologies (Proprietary) Limited
Priority to AU2002214183A priority Critical patent/AU2002214183A1/en
Publication of WO2002038676A1 publication Critical patent/WO2002038676A1/en

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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
    • 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
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse

Definitions

  • THIS invention relates to a method of making a finished product from a feedstock including polystyrene particles and finely divided lignocellulosic particles or fibres, and a thermosetting resin.
  • MDF medium density fibre board
  • a method of making a finished product including the steps of:
  • thermosetting resin in solid finely divided dry particle form or in the form of a solution or a dispersion in a liquid
  • step (c) removing any liquid present from the product of step (b);
  • step (d) subjecting the product of step (c) to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set and then cooling to form the finished product.
  • a finished product comprising:
  • thermosetting resin from 2% to 15% by weight relative to the feedstock of a thermosetting resin; components (a) and (b) being mixed together, the polystyrene having impregnated the lignocellulosic material and formed a skin at or near the outer surfaces of the finished product, and the thermosetting resin having set to bind the feedstock into the finished product.
  • the crux of the invention is a method of making a finished product from a feedstock and from a thermosetting resin.
  • the feedstock comprises a mixture of unexpanded or foamed polystyrene particles and a lignocellulosic material in finely divided particle or fibre form.
  • the polystyrene foam particles must have a particle size of less than 1.00 mm in diameter.
  • unexpanded polystyrene particles they preferably have a particle size of less than 0,3 mm in diameter. More preferably for both unexpanded and foamed polystyrene particles, the particle size is less than 150 micron in diameter, i.e dust.
  • the foamed polystyrene particles are preferably produced by feeding the polystyrene foam onto a moving abrasive belt, such as 36 grit sandpaper.
  • the particles are abraded from the foam in a suitable particle size, which is dependent upon the grit of the sandpaper or abrasive projections on the belt.
  • This method provides particles which are difficult or impossible to produce through techniques such as milling.
  • the belt must be cooled or the feed oscillated to prevent heat build up to the softening point of the polystyrene foam.
  • the bulk density of the polystyrene foam regrind is of the order of 40 g/l.
  • Polystyrene foam regrind has the advantage of providing the finished product with good hardness, low water absorption, of the order of less than 0,04% to 0,06% after 24 hour immersion, and excellent impact resistance.
  • the unexpanded polystyrene particles are preferably produced by milling polystyrene beads with a diameter of about 2 mm, to produce particles with a particle size of less than 0,3 mm in diameter.
  • step (d) the polystyrene melts and firstly impregnates the particles or fibres of the lignocellulosic material and secondly tends to migrate towards the surface of the product to produce a hard water resistant skin.
  • the second component of the feedstock is a lignocellulosic material in finely divided dry particle or fibre form.
  • lignocellulosic material there is meant any plant material emanating from the photosynthetic phenomenon.
  • the lignocellulosic material may be wood particles or fibres, paper waste or pulp, ground nutshells, cork particles, and agricultural fibres such as cotton waste.
  • the preferred lignocellulosic material is a reed from the Typha species, for which the common name is cattail, which grows in wetland areas. These reeds may be harvested and then chopped into suitable short lengths or may be reduced to fibres in any suitable manner.
  • the particular advantage of this fibre source is that a commercial benefit may be derived from wetlands designed for the natural purification of effluent or nutrient rich water.
  • the fibre may be harvested all year.
  • the fibre is soft and compliant to a shape on pressing, and is inexpensive.
  • the lignocellulosic material when in finely divided particle form must have a particle size with a diameter of from 0,25 mm to 0,75 mm inclusive.
  • the lignocellulosic material when in fibre form has fibres with a length not exceeding 16 mm, with an aspect ratio (being the ratio of length to cross- section) preferably of the order of 20:1 or greater.
  • the feedstock contains from 5% to 40% inclusive by weight of the polystyrene particles and 60 to 95% inclusive by weight of the lignocellulosic material, preferably 10% to 20% inclusive by weight of the polystyrene particles and 80% to 90%o inclusive by weight of the lignocellulosic material.
  • step (a) the polystyrene particles and the lignocellulosic material in finely divided particle or fibre form are simply mixed together. Separation does not occur as a result of electrostatic attraction and the small particle size of the polystyrene particles.
  • step (b) the feedstock is mixed with a thermosetting resin in solid finely divided particulate form or in the form of a solution or a dispersion in a liquid.
  • thermosetting resin is preferably selected from the group comprising:
  • step (i) an MDI or urethane pre-polymer, typically dispersed in a mineral oil, vegetable oil or water, which is evaporated in step (c);
  • step (ii) a phenol-formaldehyde resole resin dissolved in water or methyl alcohol, optionally including a further solvent such as, for example, acetone, to which is added an acid catalyst, the water, alcohol and other solvent if present being evaporated in step (c);
  • a further solvent such as, for example, acetone
  • a urea formaldehyde resin acid catalysed in water;
  • a melamine formaldehyde resin acid catalysed in water;
  • an unsaturated polyester resin optionally modified with a styrene monomer and with a latent catalyst therefor.
  • thermosetting resin may be provided in finely divided dry particle form. By finely divided there is meant that the thermosetting resin must have a particle size of 98% passing a 200 mesh screen.
  • thermosetting resin is preferably used in an amount of from 2% to 15% by weight relative to the feedstock, i.e to 100% by weight of the feedstock.
  • any liquid present e.g a solvent for the thermosetting resin or a dispersing agent for the thermosetting resin, is removed by evaporation or in any other suitable manner.
  • step (d) the product of step (c) is subjected to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set to form the finished product.
  • the product of step (c) may be laid on the platens of a suitable press and subjected to a temperature of from 140°C to 220°C inclusive and a pressure of from 10 kg/cm 2 to 70 kg/cm 2 inclusive for a time sufficient to allow the polystyrene to melt and the thermosetting resin to set, whereafter the product is cooled to form the finished product.
  • the melted polystyrene impregnates the lignocellulosic material, with some of the melted polystyrene migrating to the outer surfaces of the finished product to form a water resistant skin.
  • the result is a strong lightweight general purpose board such as a roof sheet or pallet deck, that may easily be nailed, cut, worked, handled and painted.
  • the mixture was spread on a carrier sheet (600 mm x 500 mm).
  • the product was then pressed to a corrugated profile, the depths of the corrugations being 25 mm and the corrugations being spaced at 75 mm centre to centre.
  • the thickness of the product was 4,5 mm and the density was 1 ,2 g/cm 3 . Thereafter the carrier sheet was removed to give the finished product.
  • the foamed polystyrene particles may be replaced with an equivalent amount of unexpanded polystyrene particles, with a particle size of less than 250 mm in diameter.

Abstract

A method of making a finished product such as a building board includes the steps of providing a feedstock of polystyrene particles and lignocellulosic material in finely divided particle or fibre form, and mixing the feedstock with a thermosetting resin. This product is then subjected to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set and then cooling to form the finished product.

Description

METHOD OF MAKING A FINISHED PRODUCT
BACKGROUND OF THE INVENTION
THIS invention relates to a method of making a finished product from a feedstock including polystyrene particles and finely divided lignocellulosic particles or fibres, and a thermosetting resin.
Many types of finished board products, based on lignocellulosic materials , are known. Examples are medium density fibre board (MDF), chipboard, and the like.
There is however always a need to prepare new finished board products of this type. .1.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a method of making a finished product including the steps of:
(a) providing a feedstock comprising:
(i) 5% to 40% inclusive by weight of the feedstock of unexpanded or foamed polystyrene particles having a particle size of not more than 1 ,0 mm diameter; and
(ii) 60% to 95% inclusive by weight of the feedstock of a lignocellulosic material in finely divided particle or fibre form;
(b) mixing the feedstock with a thermosetting resin in solid finely divided dry particle form or in the form of a solution or a dispersion in a liquid;
(c) removing any liquid present from the product of step (b); and
(d) subjecting the product of step (c) to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set and then cooling to form the finished product.
According to a second aspect of the invention there is provided a finished product made by the method set out above.
According to a third aspect of the invention there is provided a finished product comprising:
(a) a feedstock comprising:
(i) 5% to 40% inclusive by weight of the feedstock of polystyrene; and (ii) 60% to 95% inclusive by weight of the feedstock of a lignocellulosic material in finely divided particle or fibre form; and
(b) from 2% to 15% by weight relative to the feedstock of a thermosetting resin; components (a) and (b) being mixed together, the polystyrene having impregnated the lignocellulosic material and formed a skin at or near the outer surfaces of the finished product, and the thermosetting resin having set to bind the feedstock into the finished product.
DESCRIPTION OF EMBODIMENTS
The crux of the invention is a method of making a finished product from a feedstock and from a thermosetting resin.
The feedstock comprises a mixture of unexpanded or foamed polystyrene particles and a lignocellulosic material in finely divided particle or fibre form.
The polystyrene foam particles must have a particle size of less than 1.00 mm in diameter. When unexpanded polystyrene particles are used they preferably have a particle size of less than 0,3 mm in diameter. More preferably for both unexpanded and foamed polystyrene particles, the particle size is less than 150 micron in diameter, i.e dust.
The foamed polystyrene particles are preferably produced by feeding the polystyrene foam onto a moving abrasive belt, such as 36 grit sandpaper. The particles are abraded from the foam in a suitable particle size, which is dependent upon the grit of the sandpaper or abrasive projections on the belt. This method provides particles which are difficult or impossible to produce through techniques such as milling. In addition the belt must be cooled or the feed oscillated to prevent heat build up to the softening point of the polystyrene foam. The bulk density of the polystyrene foam regrind is of the order of 40 g/l. Polystyrene foam regrind has the advantage of providing the finished product with good hardness, low water absorption, of the order of less than 0,04% to 0,06% after 24 hour immersion, and excellent impact resistance. The unexpanded polystyrene particles are preferably produced by milling polystyrene beads with a diameter of about 2 mm, to produce particles with a particle size of less than 0,3 mm in diameter.
In the method of the invention, in step (d), the polystyrene melts and firstly impregnates the particles or fibres of the lignocellulosic material and secondly tends to migrate towards the surface of the product to produce a hard water resistant skin.
The second component of the feedstock is a lignocellulosic material in finely divided dry particle or fibre form.
By a lignocellulosic material there is meant any plant material emanating from the photosynthetic phenomenon.
The lignocellulosic material may be wood particles or fibres, paper waste or pulp, ground nutshells, cork particles, and agricultural fibres such as cotton waste.
The preferred lignocellulosic material is a reed from the Typha species, for which the common name is cattail, which grows in wetland areas. These reeds may be harvested and then chopped into suitable short lengths or may be reduced to fibres in any suitable manner. The particular advantage of this fibre source is that a commercial benefit may be derived from wetlands designed for the natural purification of effluent or nutrient rich water. The fibre may be harvested all year. The fibre is soft and compliant to a shape on pressing, and is inexpensive.
The lignocellulosic material when in finely divided particle form, must have a particle size with a diameter of from 0,25 mm to 0,75 mm inclusive. The lignocellulosic material when in fibre form has fibres with a length not exceeding 16 mm, with an aspect ratio (being the ratio of length to cross- section) preferably of the order of 20:1 or greater.
The feedstock contains from 5% to 40% inclusive by weight of the polystyrene particles and 60 to 95% inclusive by weight of the lignocellulosic material, preferably 10% to 20% inclusive by weight of the polystyrene particles and 80% to 90%o inclusive by weight of the lignocellulosic material.
In step (a), the polystyrene particles and the lignocellulosic material in finely divided particle or fibre form are simply mixed together. Separation does not occur as a result of electrostatic attraction and the small particle size of the polystyrene particles.
Thereafter, in step (b), the feedstock is mixed with a thermosetting resin in solid finely divided particulate form or in the form of a solution or a dispersion in a liquid.
The thermosetting resin is preferably selected from the group comprising:
(i) an MDI or urethane pre-polymer, typically dispersed in a mineral oil, vegetable oil or water, which is evaporated in step (c);
(ii) a phenol-formaldehyde resole resin dissolved in water or methyl alcohol, optionally including a further solvent such as, for example, acetone, to which is added an acid catalyst, the water, alcohol and other solvent if present being evaporated in step (c);
(iii) a phenol-formaldehyde novolac resin in finely divided dry particle form and containing a catalyst for the resin, preferably hexamethylenetetramine, which resin is either dispersed in a fine particle size inorganic extender, or mixed with a volumetric extender such as a fine particle size expanded vermiculite, with a particle size of less than 250 micron diameter, to prevent its separation from the feedstock; (iv) a urea formaldehyde resin, acid catalysed in water; (v) a melamine formaldehyde resin, acid catalysed in water; (vi) an unsaturated polyester resin optionally modified with a styrene monomer and with a latent catalyst therefor.
As indicated, the thermosetting resin may be provided in finely divided dry particle form. By finely divided there is meant that the thermosetting resin must have a particle size of 98% passing a 200 mesh screen.
The thermosetting resin is preferably used in an amount of from 2% to 15% by weight relative to the feedstock, i.e to 100% by weight of the feedstock.
In step (c) of the method of the invention, any liquid present, e.g a solvent for the thermosetting resin or a dispersing agent for the thermosetting resin, is removed by evaporation or in any other suitable manner.
In step (d), the product of step (c) is subjected to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set to form the finished product.
For example, the product of step (c) may be laid on the platens of a suitable press and subjected to a temperature of from 140°C to 220°C inclusive and a pressure of from 10 kg/cm2 to 70 kg/cm2 inclusive for a time sufficient to allow the polystyrene to melt and the thermosetting resin to set, whereafter the product is cooled to form the finished product.
As stated above, the melted polystyrene impregnates the lignocellulosic material, with some of the melted polystyrene migrating to the outer surfaces of the finished product to form a water resistant skin. The result is a strong lightweight general purpose board such as a roof sheet or pallet deck, that may easily be nailed, cut, worked, handled and painted.
An example of the invention will now be given.
Example
The following components were mixed together:
Typha reeds with a mean fibre length of 10 mm 1270g
Foamed Polystyrene particles of 0,25 mm maximum diameter 250g
Novolac Resin Code 602 by Schenectady 130g
1650g
The mixture was spread on a carrier sheet (600 mm x 500 mm). The product was then pressed to a corrugated profile, the depths of the corrugations being 25 mm and the corrugations being spaced at 75 mm centre to centre. The thickness of the product was 4,5 mm and the density was 1 ,2 g/cm3. Thereafter the carrier sheet was removed to give the finished product.
The foamed polystyrene particles may be replaced with an equivalent amount of unexpanded polystyrene particles, with a particle size of less than 250 mm in diameter.

Claims

A method of making a finished product including the steps of:
(a) providing a feedstock comprising:
(i) 5% to 40% inclusive by weight of the feedstock of unexpanded or foamed polystyrene particles having a particle size of not more than 0,3 mm diameter; and
(ii) 60% to 95% inclusive by weight of the feedstock of a lignocellulosic material in finely divided particle or fibre form;
(b) mixing the feedstock with a thermosetting resin in solid finely divided dry particle form or in the form of a solution or a dispersion in a liquid;
(c) removing any liquid present from the product of step (b); and
(d) subjecting the product of step (c) to suitable conditions of temperature and pressure to cause the polystyrene to melt and to cause the thermosetting resin to set and then cooling to form the finished product.
A method according to claim 1 wherein the polystyrene particles have a particle size of less than 150 micron diameter.
A method according to claim 1 or claim 2 wherein the lignocellulosic material comprises finely divided particles or fibres of a reed from the Typha species.
A method according to any one of claims 1 to 3 wherein the lignocellulosic material when in finely divided particle form has a particle size with a diameter of from 0,25 mm to 0,75 mm inclusive, and the lignocellulosic material when in fibre form has fibres with a length not exceeding 16 mm and an aspect ratio of the order of 20:1 or greater. A method according to any one of claims 1 to 4 wherein the feedstock comprises:
(i) 10% to 20% inclusive by weight of the feedstock of the polystyrene particles; and (ii) 80% to 90% inclusive by weight of the feedstock of the lignocellulosic material.
A method according to any one of claims 1 to 5 wherein in step (a) the polystyrene particles and the lignocellulosic material in finely divided particle or fibre form are mixed together.
A method according to any one of claims 1 to 6 wherein in step (b) the thermosetting resin is selected from the group comprising: an MDI or urethane pre-polymer dispersed in a mineral oil, a vegetable oil or water; a phenol-formaldehyde resole resin dissolved in water or methyl alcohol, and an acid catalyst for the resin; a phenol-formaldehyde novolac resin in finely divided dry particle form and a catalyst for the resin; a urea formaldehyde resin in water and a catalyst for the resin; a melamine formaldehyde resin in water and a catalyst for the resin; and an unsaturated polyester resin and a catalyst for the resin.
A method according to any one of claims 1 to 7 wherein the thermosetting resin is used in an amount of from 2% to 15% by weight to 100% by weight of the feedstock.
A method according to any one of claims 1 to 8 wherein in step (d) the product of step (c) is laid on the platens of a press and subjected to a temperature of from 140°C to 220°C inclusive and a pressure of from 10 kg/cm2 to 70 kg/cm2 inclusive for a time sufficient to allow the polystyrene to melt and the thermosetting resin to set, whereafter the product is cooled to form the finished product.
A finished product comprising:
(c) a feedstock comprising:
(iii) 5% to 40% inclusive by weight of the feedstock of polystyrene; and (iv) 60% to 95% inclusive by weight of the feedstock of a lignocellulosic material in finely divided particle or fibre form; and
(d) from 2% to 15% by weight relative to the feedstock of a thermosetting resin; components (a) and (b) being mixed together, the polystyrene having impregnated the lignocellulosic material and formed a skin at or near the outer surfaces of the finished product, and the thermosetting resin having set to bind the feedstock into the finished product.
A finished product according to claim 10 wherein the lignocellulosic material comprises finely divided particles or fibres of a reed from the Typha species.
A finished product according to claim 10 or 11 wherein the lignocellulosic material when in finely divided particle form has a particle size with a diameter of from 0,25 mm to 0,75 mm inclusive, and the lignocellulosic material when in fibre form has fibres with a length not exceeding 16 mm and an aspect ratio of the order of 20:1 or greater.
A finished product according to any one of claims 10 to 12 wherein the feedstock comprises:
(i) 10% to 20% inclusive by weight of the feedstock of the polystyrene; and (ii) 80% to 90% inclusive by weight of the feedstock of the lignocellulosic material.
A finished product according to any one of claims 10 to 13 wherein the thermosetting resin is selected from the group comprising: an MDI or urethane pre-polymer dispersed in a mineral oil, a vegetable oil or water; a phenol-formaldehyde resole resin dissolved in water or methyl alcohol, and an acid catalyst for the resin; a phenol-formaldehyde novolac resin in finely divided dry particle form and a catalyst for the resin; a urea formaldehyde resin in water and a catalyst for the resin; a melamine formaldehyde resin in water and a catalyst for the resin; and an unsaturated polyester resin and a catalyst for the resin.
PCT/IB2001/002108 2000-11-10 2001-11-09 Method of making a finished product WO2002038676A1 (en)

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ZA2000/6525 2000-11-10
ZA200006525 2000-11-10

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WO2011018373A1 (en) 2009-08-13 2011-02-17 Basf Se Light lignocellulosic materials having good mechanical properties
WO2011018372A1 (en) 2009-08-13 2011-02-17 Basf Se Light lignocellulosic materials having good mechanical properties
WO2011054790A1 (en) 2009-11-06 2011-05-12 Basf Se Lignocellulose materials with good mechanical properties
US8187709B2 (en) 2007-09-19 2012-05-29 Basf Se Light wood-based materials having good mechanical properties and low formaldehyde emission
US8623501B2 (en) 2010-03-04 2014-01-07 Basf Se Lignocellulose materials having good mechanical properties
CN103568097A (en) * 2013-10-21 2014-02-12 黄宣斐 Low-density plate containing natural wood fibers
US8920923B2 (en) 2010-03-04 2014-12-30 Basf Se Lignocellulose materials having good mechanical properties
CN104786342A (en) * 2015-04-24 2015-07-22 东北林业大学 Wood composite board with low-density sandwich-type structure and preparation method thereof

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EP2319670A1 (en) 2006-10-19 2011-05-11 Basf Se Lightweight wooden material
WO2008046891A1 (en) * 2006-10-19 2008-04-24 Basf Se Light wood materials with good mechanical characteristics
WO2008046890A3 (en) * 2006-10-19 2008-06-12 Basf Se Light wood-based materials
WO2008046892A3 (en) * 2006-10-19 2008-08-21 Basf Se Light wood-based materials
DE202006020503U1 (en) 2006-10-19 2008-10-09 Basf Se Light wood materials
EA013666B1 (en) * 2006-10-19 2010-06-30 Басф Се Light wood-based material
CN101541488B (en) * 2006-10-19 2014-01-15 巴斯夫欧洲公司 Light wood-based materials
EP1914052A1 (en) * 2006-10-19 2008-04-23 Basf Se Lightweight wooden material
US9089991B2 (en) 2006-10-19 2015-07-28 Basf Se Light wood-based materials
WO2008046890A2 (en) * 2006-10-19 2008-04-24 Basf Se Light wood-based materials
EA013665B1 (en) * 2006-10-19 2010-06-30 Басф Се Light wood-based materials
US8187709B2 (en) 2007-09-19 2012-05-29 Basf Se Light wood-based materials having good mechanical properties and low formaldehyde emission
CN101802104B (en) * 2007-09-19 2012-05-30 巴斯夫欧洲公司 Light wood-based materials having good mechanical properties and low formaldehyde emission
WO2011018373A1 (en) 2009-08-13 2011-02-17 Basf Se Light lignocellulosic materials having good mechanical properties
WO2011018372A1 (en) 2009-08-13 2011-02-17 Basf Se Light lignocellulosic materials having good mechanical properties
WO2011054790A1 (en) 2009-11-06 2011-05-12 Basf Se Lignocellulose materials with good mechanical properties
US8623501B2 (en) 2010-03-04 2014-01-07 Basf Se Lignocellulose materials having good mechanical properties
US8920923B2 (en) 2010-03-04 2014-12-30 Basf Se Lignocellulose materials having good mechanical properties
CN103568097A (en) * 2013-10-21 2014-02-12 黄宣斐 Low-density plate containing natural wood fibers
CN104786342A (en) * 2015-04-24 2015-07-22 东北林业大学 Wood composite board with low-density sandwich-type structure and preparation method thereof

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