EP3338978B1 - Verfahren zur behebung von defekten in holzfurnieren - Google Patents

Verfahren zur behebung von defekten in holzfurnieren Download PDF

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Publication number
EP3338978B1
EP3338978B1 EP16382633.2A EP16382633A EP3338978B1 EP 3338978 B1 EP3338978 B1 EP 3338978B1 EP 16382633 A EP16382633 A EP 16382633A EP 3338978 B1 EP3338978 B1 EP 3338978B1
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EP
European Patent Office
Prior art keywords
veneers
wood
board
defects
veneer
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
EP16382633.2A
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English (en)
French (fr)
Other versions
EP3338978A1 (de
Inventor
Juan ALBIÑANA GARCIA-DIHINX
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.)
Grupo Garnica Plywood SA
Original Assignee
Grupo Garnica Plywood SA
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 Grupo Garnica Plywood SA filed Critical Grupo Garnica Plywood SA
Priority to ES16382633T priority Critical patent/ES2900483T3/es
Priority to EP16382633.2A priority patent/EP3338978B1/de
Publication of EP3338978A1 publication Critical patent/EP3338978A1/de
Application granted granted Critical
Publication of EP3338978B1 publication Critical patent/EP3338978B1/de
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Classifications

    • 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
    • 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
    • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined

Definitions

  • the present invention relates to a method of obtaining boards.
  • the document US 4451605 A1 discloses the following steps of such a method: verifying if there is a defect in the top veneer, applying to defects in veneers a polyurethane-based putty with a viscosity comprised between 200,000 cPs and 400,000 cPs measured at a temperature of 25°C.
  • Turning and peeling a tree trunk allows obtaining wood veneers intended for the quality furniture sector, among other uses. However, not all the timber that is produced can be intended for obtaining wood veneers since only the part of the trunk that is free of branches and knots can be turned and peeled.
  • the rest of the timber is used for obtaining lower quality timber that is processed to manufacture cases for fruit, toothpicks or for grinding up and manufacturing particle boards.
  • the value of the wood that is obtained for veneers is much higher than that of wood intended for other uses, so it is of great interest for the operation to be managed such that the largest possible volume of high quality wood is obtained.
  • Non-round (oval-shaped) trunks also lower the final price of wood since it is a necessary condition in order to take complete advantage of the turning and peeling process.
  • the wood itself in its place of origin can have unique physiological features, and these particularities can lead to defects from the user's point of view. These defects are used to classify woods according to their qualities.
  • knots that can lessen the mechanical strength of the veneers, splits, local breaking of the wood, damages due to external causes such as blows produced by machinery or breaking due to environmental causes.
  • Wood boards can be made with fine wood veneers glued on top of one another with adhesive compositions and by means of high pressure and temperature.
  • the veneers can have different defects.
  • Top quality veneers are used for the exposed faces of the board, such that said board has a better finish and offers a better appearance.
  • First quality veneers are veneers that do not have these defects, so it would be very beneficial to develop a method that allows repairing minor defects in wood veneers that cannot be used as first quality veneers.
  • defects in veneer is understood as voids in the material such as for example checks, splits, micro-checking, knots or teardrop markings that must be corrected.
  • Checks are cracks occurring in the direction of the medullary rays, generally due to excessive drying with very quick loss of moisture. Unlike checks, splits occur from the outside towards the center of the tree. They are caused by shrinkage or excessively rapid drying of the tree, which can be caused by drought, excessive exposure to the sun or intense frosts. Micro-checking is similar to checks, but they have larger proportions, stemming from the heart out towards the bark.
  • branches causes the fibers surrounding the formation of branches growing in a different direction than the trunk to shift. When these fibers break, dry out or are cut, they are trapped between the new layers of sapwood, and new tissues are formed on these layers, covering them, giving rise to what is referred to as knots; if the knots are dead, they come off easily due to the shrinkage of the fibers during drying, entailing a loss of product and leaving a hole.
  • Teardrop markings are caused by rain water seepage when a branch is torn off, rots off or breaks off, interrupting the normal passage of sap and enters the surrounding woody areas, causing a loss of product.
  • a method for the simple application of a composition that allows repairing these defects that may be present in wood veneers and allows leveling out the numerical balance of first quality veneers and second quality veneers has been developed in the present invention.
  • the object of the veneers of the invention is to be part of a board; therefore the invention is a method of obtaining the board comprising the steps of:
  • the final wood facing is a wood veneer that can later be treated, for example varnished, re-veneered or laminated.
  • the invention relates to a method of obtaining the board comprising the steps of:
  • the polyurethane-based putty comprises from 50% to 70% of a 1,6-hexamethylene diisocyanate polymer, from 1% to 10% of diethyl fumarate and from 10% to 30% of tetraethyl N,N'-(methylenecyclohexane-4,1-diyl) bis-DL-aspartate.
  • the putty of the invention has sufficient viscosity to remain firm from the time it is applied on the board being formed until it enters the press, and at the same time sufficient flow so that the excess product applied spreads between the veneers when the board is subjected to the required pressure.
  • the putty exhibits sufficient hardness and tack so that no detachments, checks, or unpeeling occurs when cutting the board. Finally, it is important for as little putty as possible is transferred through the face during the pressing process, and for the lowering of the volume once the board is stabilized is undetectable.
  • the application is performed by means of a gun.
  • the different components were mixed to produce the putty.
  • the application was done with a semiautomatic application system that performed the mixing and metered out the product by means of a bag provided with an end nozzle.
  • the points that were analyzed are the filling, loss, hardness, flow, moisture resistance, temperature resistance, and how easy it is to apply.
  • the possible loss was measured by means of measuring with a micrometer the thickness of the board. A loss of thickness in the filled area was not detected.
  • Moisture resistance was also measured, and it was correct because it withstands 72 hours in water at 100°C.
  • Temperature resistance was correct; it withstands 24 hours in a chamber at 105°C.
  • Nail withdrawal resistance in the repaired area is equal to or better than that of a base board.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Claims (2)

  1. Verfahren zur Herstellung von Platten, das die folgenden Schritte umfasst:
    a) Übereinanderlegen von zwei Furnieren, um ein Paar zu bilden, wobei die Faser des zweiten senkrecht (mit 90°) zu der ersten orientiert ist; wobei das Holz des Furniers aus Schwarzpappel, Eukalyptus, Roteiche und Walnuss ausgewählt ist;
    b) Überprüfen, ob das obere Furnier einen Defekt aufweist;
    c) Auftragen einer Spachtelmasse (auf Polyurethanbasis) mit einer Viskosität zwischen 200.000 cPs und 400.000 cPs, gemessen bei 25°C, in die Defekte des oberen Furniers;
    d) Stapeln der gewünschten Anzahl von aus zwei Furnieren bestehenden Sätzen, die die Platte bilden werden;
    e) Anordnen einer endgültigen Holzoberfläche und Pressen der Platte.
  2. Verfahren Herstellung von Platten nach Anspruch 1, wobei das Auftragen mittels einer Pistole erfolgt.
EP16382633.2A 2016-12-21 2016-12-21 Verfahren zur behebung von defekten in holzfurnieren Active EP3338978B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES16382633T ES2900483T3 (es) 2016-12-21 2016-12-21 Procedimiento para reparar defectos en chapas de madera
EP16382633.2A EP3338978B1 (de) 2016-12-21 2016-12-21 Verfahren zur behebung von defekten in holzfurnieren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16382633.2A EP3338978B1 (de) 2016-12-21 2016-12-21 Verfahren zur behebung von defekten in holzfurnieren

Publications (2)

Publication Number Publication Date
EP3338978A1 EP3338978A1 (de) 2018-06-27
EP3338978B1 true EP3338978B1 (de) 2021-08-25

Family

ID=58017881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16382633.2A Active EP3338978B1 (de) 2016-12-21 2016-12-21 Verfahren zur behebung von defekten in holzfurnieren

Country Status (2)

Country Link
EP (1) EP3338978B1 (de)
ES (1) ES2900483T3 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4451605A (en) * 1982-05-07 1984-05-29 Minnesota Mining And Manufacturing Company Solvent-based, one-part, filled polyurethane for flexible parts
US4614555A (en) * 1985-03-18 1986-09-30 Champion International Corporation Apparatus and process for making plywood using control means and patching material
DE10230574A1 (de) * 2002-07-05 2004-01-22 Häussermann GmbH & Co. KG Verfahren zum Ausgleich der Oberfläche von Holz

Also Published As

Publication number Publication date
ES2900483T3 (es) 2022-03-17
EP3338978A1 (de) 2018-06-27

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