EP2621695B1 - Verfahren zur herstellung eines holzverbundwerkstoffs und holzverbundwerkstoff - Google Patents

Verfahren zur herstellung eines holzverbundwerkstoffs und holzverbundwerkstoff Download PDF

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Publication number
EP2621695B1
EP2621695B1 EP11771058.2A EP11771058A EP2621695B1 EP 2621695 B1 EP2621695 B1 EP 2621695B1 EP 11771058 A EP11771058 A EP 11771058A EP 2621695 B1 EP2621695 B1 EP 2621695B1
Authority
EP
European Patent Office
Prior art keywords
wood composite
composite material
binder
wood
material according
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.)
Active
Application number
EP11771058.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2621695A1 (de
Inventor
Peter GRÄTER
Stephan Frybort
Ulrich Müller
Raimund Mauritz
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.)
Doka GmbH
Original Assignee
Doka GmbH
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 Doka GmbH filed Critical Doka GmbH
Priority to PL11771058T priority Critical patent/PL2621695T3/pl
Publication of EP2621695A1 publication Critical patent/EP2621695A1/de
Application granted granted Critical
Publication of EP2621695B1 publication Critical patent/EP2621695B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B27N3/005—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and foam
    • 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
    • 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
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres

Definitions

  • the present invention relates to a wood composite material which is suitable for the production of supporting elements, and a method for its production.
  • the wood components of conventional board materials as well as the special wood materials such as squeeze, scrimber, TimTek, Srimtec, SST, etc. are significantly compressed in the production.
  • this pressing process is accompanied by a densification of the cell structure of the wood (cell collapse).
  • cell collapse With water absorption, such a deformation can be partially reversed by the strongly hygroscopic properties of the wood and by the swelling of the cell walls. But this is accompanied by strong swelling of the compressed parts and thus of the whole plate material.
  • EP-A1-1588814 discloses a wood composite having a density of 300 kg / m 3 to 800 kg / m 3 and having a modulus of elasticity of 3000 MPa to 14100 MPa.
  • the wood composite according to the invention has a density of 200-550 kg / m 3 , preferably 300-550 kg / m 3 .
  • the stiffness, measured as modulus of elasticity in the 4-point bending test according to EN 789, is 4,000-12,000 MPa, preferably 5,000-12,000 MPa, particularly preferably 6,000-12,000 MPa.
  • the wood composite material has a density of 300-550 kg / m 3 and a stiffness (modulus of elasticity) of 6,000-12,000 MPa.
  • the wood composite according to the invention comprises macrofibres made of wood with a degree of slimming (ratio of length to thickness of the fibers) greater than 20.
  • the macrofibers used have a length of 100-400 mm, more preferably 150-300 mm. It is obvious to the person skilled in the art that it can not be ruled out in terms of production technology that the fibers used always comprise a certain proportion of shorter fibers.
  • the wood composite according to the invention further comprises a binder which has a predominantly fine-pored foam structure in the cured state such that 90-95% of the pores have a pore size in the range of 30-500 .mu.m, preferably 50-300 .mu.m, measured by a microscope on a section through have the material, and which forms a foam having a density of 30-300 kg / m 3 , preferably 80-200 kg / m 3 , with free foaming.
  • the unreacted binder is poured into an open-topped vessel. Due to the chemical reaction, the binder foams up and can expand freely through the opening. After curing, the over-swollen foam is cleanly separated with a knife.
  • the density of the free-foamed binder can be calculated from the previously determined volume and weight of the vessel and the weight of the foam-filled vessel.
  • the macro fibers used may be modified by suitable measures before further processing.
  • suitable measures include, for example, acetylation or impregnation with suitable resins or chemicals, e.g. Melamine resin or DMDHEU, thermal modification or other known swell-compensating measures.
  • suitable resins or chemicals e.g. Melamine resin or DMDHEU
  • thermal modification or other known swell-compensating measures e.g. Melamine resin or DMDHEU
  • the swelling of the fibers is reduced in moisture absorption and the total swelling of the wood composite material particularly low. This allows swelling values of less than 2% to 4% to be achieved.
  • the macrofibres used in the wood composite according to the invention can be impregnated very easily.
  • the modification of solid wood fails in many cases due to the lack of impregnability of the wood.
  • the binder used according to the invention is preferably a polymer-based binder.
  • a polymer-based binder for example, epoxy resin, isocyanate (including polyurethane), melamine, urea, phenolic foams or mixtures thereof can be used.
  • a polyurethane system is used, such as a one- or multi-component polyurethane system, in particular a two-component polyurethane system.
  • thermoplastic foams such as polystyrene (eg EPS or EPX).
  • the wood composite according to the invention further contains particles which can be excited by fields, e.g. Iron oxide particles.
  • the foaming and curing process of the binder can be initiated (started) and / or accelerated by application of a field (e.g., induction, microwave, radio frequency, radiation, etc.).
  • the particles may conveniently be introduced into the binder prior to the production of the wood composite material, but they may also be used separately.
  • heat, hot air or steam can be used to initiate or accelerate the foaming and curing process of the binder.
  • the binder is applied to the aligned macrofibers (sequence of steps: a, b, c, d and e).
  • the binder may also be applied prior to aligning the macrofibre (sequence of steps: a, c, b, d and e).
  • the method may advantageously be continuously, e.g. be carried out by means of a belt press.
  • the macrofibers are dried and oriented substantially uniaxially (i.e., in parallel) on press sheets or dies.
  • the binder is applied between and / or on the aligned macrofibers.
  • the application of the binder can be carried out by methods established in the wood industry, e.g. Spray or gluing or gluing.
  • the foaming time of the binder is adjusted so that the foaming process begins predominantly only after the press has been closed. That the binder system is chemically adjusted so that the foaming start time is delayed such that the press or die can be closed before significant foaming occurs.
  • the macrofibers are preferably only minimally compressed, so that the density of the wood composite material produced does not differ significantly from the density of the wood used. Since the macrofibers are compressed only insignificantly in the process according to the invention, the sources occurring in the event of later contact with water or when stored in water can be minimized or avoided. As a result, swelling values can be obtained which are in the range of the swelling of the used wood or even below. This is an essential one Advantage over conventional wood-based materials, which have a mostly high wood compaction and thereby have a significantly higher swelling than the wood used in contact with water.
  • the externally applied pressing pressure acts, on the other hand, a frictional pressure develops due to the foaming of the binder, so that the binder substantially completely penetrates the network of macro fibers and largely completely wets them on its surface.
  • the macrofibers are thus surrounded by a binder matrix and are thus well protected against moisture absorption.
  • the binder Since the binder is introduced by the expansion of the binder in the network of macrofibres, creates a very homogeneous material with uniform density, in which almost all cavities are filled with the foam structure and the fibers are almost completely surrounded by foam (enveloped).
  • the inventive method in particular when using a two-component polyurethane system as a binder, the advantage that only insignificantly heat must be supplied to start the cure.
  • the necessary heat can already be introduced by slight preheating of the macro fibers (for example to 30-90 ° C., preferably 50 ° C.).
  • the press can be reopened immediately. Even if not complete Hardened plates of the wood composite material according to the invention, however, the plates are not destroyed in contrast to conventional wood-based panels by so-called splitter. Due to a possible post-hardening, the wood composite material according to the invention merely causes attrition.
  • the wood composite according to the invention is suitable for all products that are made of solid wood or wood-based materials, such as chipboard or OSB, etc. Due to the lower density of the use of the wood composite material according to the invention leads to a lower weight of the products thus produced.
  • Macrofibers are dried by a warm (50 ° C) air stream and several days in a room climate of 20 ° C and 65% rel. Humidity stored, resulting in a wood moisture of about 12%.
  • 210 g of the macrofibers are oriented as exactly as possible parallel to one another.
  • 50% of the fibers are placed in an aluminum mold (30 ⁇ 12 cm) heated to 50 ° C. and uniformly wetted with 60 g of two components of polyurethane (from RAMPF No. 80 L86 / 4-1). Subsequently, the remaining 50% of the fibers are placed in the mold and the mold is closed, so that the inserted macrofibres are compressed to a height of 16 mm. Due to the chemical reaction of the two components of the polyurethane with the water available in the wood foams this strong. After 30 min. the foam is completely cured and the wood composite material can be removed from the mold.

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)
  • Laminated Bodies (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polyurethanes Or Polyureas (AREA)
EP11771058.2A 2010-10-01 2011-09-30 Verfahren zur herstellung eines holzverbundwerkstoffs und holzverbundwerkstoff Active EP2621695B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11771058T PL2621695T3 (pl) 2010-10-01 2011-09-30 Sposób wytwarzania drzewnego materiału kompozytowego i drzewny materiał kompozytowy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010047254.9A DE102010047254B4 (de) 2010-10-01 2010-10-01 Holzverbundwerkstoff
PCT/EP2011/067133 WO2012042027A1 (de) 2010-10-01 2011-09-30 Holzverbundwerkstoff

Publications (2)

Publication Number Publication Date
EP2621695A1 EP2621695A1 (de) 2013-08-07
EP2621695B1 true EP2621695B1 (de) 2018-01-03

Family

ID=44906023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11771058.2A Active EP2621695B1 (de) 2010-10-01 2011-09-30 Verfahren zur herstellung eines holzverbundwerkstoffs und holzverbundwerkstoff

Country Status (11)

Country Link
EP (1) EP2621695B1 (ru)
JP (1) JP5997696B2 (ru)
KR (1) KR101500925B1 (ru)
CN (1) CN103153562B (ru)
BR (1) BR112013007793A2 (ru)
DE (1) DE102010047254B4 (ru)
ES (1) ES2663007T3 (ru)
NO (1) NO2621695T3 (ru)
PL (1) PL2621695T3 (ru)
RU (1) RU2541652C2 (ru)
WO (1) WO2012042027A1 (ru)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109702845B (zh) * 2018-11-29 2022-03-29 南京林业大学 一种低密度无胶秸秆板、制备方法及其应用
EP4286123A1 (en) 2022-05-30 2023-12-06 ETH Zurich Rod-based wood materials

Family Cites Families (23)

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GB1118221A (en) * 1965-09-16 1968-06-26 Monsanto Chemicals Composite materials
US3671377A (en) * 1970-07-29 1972-06-20 Alan A Marra Rigid composite products and process for the preparation thereof
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JPS61266203A (ja) * 1985-05-20 1986-11-25 Maruyoshi Ando Kk 配向性積層木材の製造方法
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RU2017599C1 (ru) * 1991-06-27 1994-08-15 Белорусский технологический институт им.С.М.Кирова Способ изготовления древесностружечных плит
CA2172154A1 (en) * 1994-07-19 1996-02-01 Hubert Geltinger Process for producing interior trims for transport means and interior trims thus produced
DE19526032A1 (de) * 1995-07-17 1997-02-20 Henkel Kgaa Polymerholz-Formkörper, ihre Herstellung und Verwendung
US20030125458A1 (en) * 1995-07-17 2003-07-03 Lothar Thiele Process for producing cellulose/plastic composites and product of the process
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JP2000071216A (ja) * 1998-08-27 2000-03-07 Sekisui Chem Co Ltd 木質材料及びその製造方法
JP2000280208A (ja) * 1999-03-29 2000-10-10 Yamaha Corp 木質繊維板及びその製造法
JP2000351106A (ja) * 1999-06-10 2000-12-19 Yamaha Corp 木質材の製造法
US7670518B2 (en) * 2000-11-23 2010-03-02 Hi-Tech Engineering Limited Composite products
CN2595565Y (zh) * 2002-10-28 2003-12-31 南京林业大学 杨木基复合板
NZ562521A (en) * 2003-06-20 2009-03-31 James Hardie Int Finance Bv Roofing hip or ridge tile with nailable cementitious portions hinged together
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DE102004019529A1 (de) * 2004-04-22 2005-11-10 Henkel Kgaa Verfahren zur Herstellung von Formkörpern auf Basis von Polyurethan-Bindemitteln und cellulosehaltigem Material
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CN101042018A (zh) * 2007-04-10 2007-09-26 南京工业大学 一种复合材料模板

Also Published As

Publication number Publication date
DE102010047254A1 (de) 2012-04-05
EP2621695A1 (de) 2013-08-07
DE102010047254B4 (de) 2017-02-02
JP2013541444A (ja) 2013-11-14
KR20130088157A (ko) 2013-08-07
WO2012042027A1 (de) 2012-04-05
CN103153562B (zh) 2016-03-09
RU2541652C2 (ru) 2015-02-20
KR101500925B1 (ko) 2015-03-10
ES2663007T3 (es) 2018-04-10
RU2013120352A (ru) 2014-11-20
JP5997696B2 (ja) 2016-09-28
NO2621695T3 (ru) 2018-06-02
CN103153562A (zh) 2013-06-12
BR112013007793A2 (pt) 2016-06-07
PL2621695T3 (pl) 2018-04-30

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