EP0509044B1 - Process for improving a wooden part, and product obtained by said process - Google Patents

Process for improving a wooden part, and product obtained by said process Download PDF

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Publication number
EP0509044B1
EP0509044B1 EP91902806A EP91902806A EP0509044B1 EP 0509044 B1 EP0509044 B1 EP 0509044B1 EP 91902806 A EP91902806 A EP 91902806A EP 91902806 A EP91902806 A EP 91902806A EP 0509044 B1 EP0509044 B1 EP 0509044B1
Authority
EP
European Patent Office
Prior art keywords
wooden part
plastic
wood
process according
removal
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.)
Expired - Lifetime
Application number
EP91902806A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0509044A1 (en
Inventor
Pieter De Jong
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0509044A1 publication Critical patent/EP0509044A1/en
Application granted granted Critical
Publication of EP0509044B1 publication Critical patent/EP0509044B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G1/00—Machines or devices for removing knots or other irregularities or for filling-up holes

Definitions

  • the invention relates to a process for improving a wooden part, comprising the detection and removal of undesirable material, filling of the opening produced with a setting plastic material, and finishing of wooden part.
  • the present invention relates to the improvement of new parts such as a beam.
  • hardwood On account of environmental considerations, the use of so-called hardwood is being banned to an increasing extent. This means that either plastic material for door and window frames and the like or woods such as pine or deal are being used. Since there are also environmental objections to plastic, there is increasing emphasis on the use of conventional wood materials. A disadvantage of these wood materials is that they have knots, resin ducts and cracks. When used outdoors, such wood materials constitute the starting point for rotting, and paint does not adhere readily to such materials. That is why various government bodies have laid down standards which must be met by wood materials. For example, knots must always be healthy and not have any black patches. Knots will form contours with the passage of time, i.e.
  • knots may in principle not exceed 15 mm in diameter.
  • standards as regards the number of knots per metre of wood Most of the timber currently felled in Europe cannot meet these standards.
  • a first alternative for still meeting these standards is the production of laminated wood. In this case a beam is divided into different pieces, and the parts containing knots and the like are sawn out. These parts are connected to each other by means of a finger joint.
  • the object of the invention is to avoid the disadvantages described above.
  • the wooden part comprises a solid part which is subjected to detection in an untreated or roughly pre-treated state, in that the removal of undesirable material comprises the making of an opening at least 1 cm deep, in that the plastic material comprises a permanently elastic plastic, and in that after setting thereof the entire part is subjected to a first finishing treatment.
  • the wooden part comprises a solid part which is subjected to detection in an untreated or roughly pre-treated state
  • the removal of undesirable material comprises the making of an opening at least 1 cm deep
  • the plastic material comprises a permanently elastic plastic
  • the entire part is subjected to a first finishing treatment.
  • the part of solid wood is at most roughly planed beforehand, and no finishing treatment is carried out, as described in US Patent Specification 4,614,555 before the openings made are filled with plastic material. This means that one working step is left out. In the case of the thin fillers used in plywood material, this is not possible because the forces occurring during finishing would then become so great that the hard filling agent introduced could come away from the wood.
  • the wooden part is given the first finishing treatment only after at least partial setting of the plastic material.
  • the philosophy on which the invention is based is first to upgrade the wood and only then to work it further.
  • the machining treatment for the removal of material involves milling. It has been found that drilling does not give a sufficient guarantee of all the undesirable material being removed. In practice, undesirable pieces of wood do not extend as cylindrical columns, but have a more random shape, which can be removed particularly well by milling.
  • the plastic used is preferably a plastic on an epoxy resin base.
  • Epoxy material has a particularly good adhesive strength and provides a particularly good seal, so that the capillary action of knots and plugs described above cannot occur.
  • the elastic properties make it readily possible to provide fixing means in the epoxy material without this leading to bursting or cracking.
  • Epoxy material can be burned without damage to the environment and, if it is machined, many applications of the waste material obtained in the process are possible, because epoxy material is not toxic.
  • the epoxy material preferably contains no fillers and the like.
  • the colour difference from the wooden part is slight.
  • Applying the plastic in the form of a paste means that it is not necessary for the shaped opening to be bounded by wood on all sides.
  • the plastic compound in paste form does not flow away. The vibration will make the plastic compound become thinner temporarily and locally, as a result of which optimum filling of the opening takes place.
  • the invention is particularly advantageous in the case of shaped beams because, aside from the costs, little or no technical improvement can be made to these by the methods according to the state of the art.
  • the treatment is particularly suitable for parts of wood material which are visible, and thus are subject to weathering.
  • the invention also relates to a shaped product, such as door or window frames, in which a wooden part is used, and which is obtained by the process described above.
  • a beam part is indicated by 1.
  • This beam is roughly planed and contains a number of undesirable flaws, such as a knot 2, a resin duct 3 and a crack 4.
  • these undesirable parts 2 - 4 are removed by milling, and openings 5, 6 and 7 respectively are thereby produced.
  • milling is used, for example with a wood-milling cutter having a diameter of 10 mm, because a recess better adapted to the unpredictable shape of the undesirable part can thereby be obtained.
  • the depth of the shaping is at least 1 cm, and preferably lies between 1.5 and 3 cm. This depends on the wood used. Any kind of wood has in fact knots and similar flaws of a certain average depth. This depth can be detected if necessary.
  • Fig. 3 shows the situation after filling of the openings 5, 6, 7 with a two-component material, such as permanently elastic epoxy resin.
  • This epoxy material preferably contains no fillers, in order to ensure that its machineability is kept essentially the same as that of the wood.
  • An example of such a permanently elastic epoxy material is epoxy resin based on a bisphenol A/S and/or epichlorohydrin.
  • the beam 1 is subjected to a further finishing planing treatment, in which, for example, 1 to 2 mm of material is removed.
  • a further finishing planing treatment in which, for example, 1 to 2 mm of material is removed.
  • the epoxy material can if necessary be set with the aid of ultraviolet or infrared rays. After the planing operation, preservation can take place, for example in vacuum conditions.
  • the epoxy parts do not affect the characteristics of painting the wood with all known types of paint, such as water-bearing paints and alkyl-based paints. Nor have problems been found with the fitting of fixing means and glazing, because the epoxy resin is permanently elastic. If the moisture content in the wood increases and decreases, this has no effect at all on the epoxy part.
  • Hardwood such as meranti, is 20% cheaper, if it may be used.
  • Beam material according to the present invention costs about half the price of the laminated wood product and no appreciable wood loss occurs during the improvement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
EP91902806A 1990-01-11 1991-01-11 Process for improving a wooden part, and product obtained by said process Expired - Lifetime EP0509044B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL9000083 1990-01-11
NL9000083A NL9000083A (nl) 1990-01-11 1990-01-11 Werkwijze voor het verbeteren van een houten deel alsmede gevormd voortbrengsel verkregen met deze werkwijze.
PCT/NL1991/000004 WO1991010793A1 (en) 1990-01-11 1991-01-11 Process for improving a wooden part, and product obtained by said process

Publications (2)

Publication Number Publication Date
EP0509044A1 EP0509044A1 (en) 1992-10-21
EP0509044B1 true EP0509044B1 (en) 1994-09-28

Family

ID=19856406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91902806A Expired - Lifetime EP0509044B1 (en) 1990-01-11 1991-01-11 Process for improving a wooden part, and product obtained by said process

Country Status (4)

Country Link
EP (1) EP0509044B1 (nl)
DE (1) DE69104347T2 (nl)
NL (1) NL9000083A (nl)
WO (1) WO1991010793A1 (nl)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9300539A (nl) * 1993-03-25 1994-10-17 Pieter De Jong Werkwijze en inrichting voor het verbeteren van een houten deel.
NL9401310A (nl) * 1994-08-12 1996-03-01 Pieter De Jong Werkwijze en inrichting voor het verbeteren van een houten deel.
EP1358977B1 (de) * 2002-06-04 2003-11-26 Franz Binder Ges. mbH Holzindustrie Verfahren zum Herstellen von Brett- bzw. Balkenschichtholz
ES2357656T3 (es) * 2004-03-11 2011-04-28 Akzo Nobel Coatings International Bv Reparación de daño natural durante la producción de artículos que comprenden madera.
CN107100379A (zh) * 2017-07-03 2017-08-29 洛阳理工学院 一种古建筑上开口单材拱的拱口加固修缮结构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280540B (de) * 1961-06-14 1968-10-17 Vollmann & Hoellfritsch Verfahren zum Verbinden von durch Risse oder Arbeitsfugen getrennten Bauwerksteilen
US3741853A (en) * 1970-08-06 1973-06-26 Publishers Paper Co Repair of wood panels
GB1479020A (en) * 1975-12-02 1977-07-06 Balfour Beatty Ltd Artificial and natural structures
AT377034B (de) * 1981-05-12 1985-01-25 Ngt Nova Gruendungstechnik Verfahren zur abdichtung eines risses oder einer fuge in beton oder naturstein
NL8204933A (nl) * 1982-12-22 1984-07-16 Jan Albertus Gerrit Janssen Va Werkwijze voor het restaureren van een houtconstructie.
US4614555A (en) * 1985-03-18 1986-09-30 Champion International Corporation Apparatus and process for making plywood using control means and patching material

Also Published As

Publication number Publication date
EP0509044A1 (en) 1992-10-21
NL9000083A (nl) 1991-08-01
DE69104347D1 (de) 1994-11-03
WO1991010793A1 (en) 1991-07-25
DE69104347T2 (de) 1995-03-30

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