EP0403024A1 - Méthode et dispositif pour souder entre elles des plaques de matière ligneuse - Google Patents

Méthode et dispositif pour souder entre elles des plaques de matière ligneuse Download PDF

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Publication number
EP0403024A1
EP0403024A1 EP19900201527 EP90201527A EP0403024A1 EP 0403024 A1 EP0403024 A1 EP 0403024A1 EP 19900201527 EP19900201527 EP 19900201527 EP 90201527 A EP90201527 A EP 90201527A EP 0403024 A1 EP0403024 A1 EP 0403024A1
Authority
EP
European Patent Office
Prior art keywords
curing
sheets
adhesive
conveyor
pressure
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.)
Withdrawn
Application number
EP19900201527
Other languages
German (de)
English (en)
Inventor
Stephanus Petrus Van Sterkenburg
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.)
STERKENBURG STEPHANUS PETRUS V
Original Assignee
STERKENBURG STEPHANUS PETRUS V
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 STERKENBURG STEPHANUS PETRUS V filed Critical STERKENBURG STEPHANUS PETRUS V
Publication of EP0403024A1 publication Critical patent/EP0403024A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
    • B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting

Definitions

  • the invention relates to a method for welding together sheets of woody material, comprising applying adhesive to said sheets, assembling said sheets and curing the adhesive while applying heat and pressure. Further the invention relates to an apparatus for carrying out said method.
  • Such sheets of woody material are manufactured in standard dimensions, for example 1,25 times 2.50 m. For several applications however it is required to provide sheets having larger dimensions. For obtaining this it is known to weld together the sheets having standard dimensions for providing long assembled sheets (which process is known as welding). The assembled sheets thus manufactured then can be used.
  • the most conventional known welding method uses a scarf joint in which as adhesive phenolformaldehyde or urea/melamineformaldehyde is applied, that by means of a high frequency bonding is cured in a very short time.
  • a disadvantage of this known method, and also of other known methods, is that most commonly complicated and thus expensive apparatuses are required, such as apparatuses for heigh frequency bonding and apparatuses for the manufacture of complicated joint shapes.
  • the method according to the invention is characterised in that the adhesive is cured in several steps wherein each step occurs at a different curing location and wherein after completing of a curing step the respective welding seam is transferred to a next curing location. Because curing the adhesive occurs in several steps at different curing locations it is possible to increase the production speed obtained by the method. After a welding seam is partially cured at a first curing location this welding seam is conveyed to a next curing location, where a next phase of the curing proces occurs. Meanwhile at the first curing location a next welding seam can already be subjected to the first curing step. This process can be repeated again and again, such that the final production velocity is increased with respect to the case in which curing should occur entirely at one single curing location.
  • the curing occurs in at least three curing steps.
  • substantially the application of three curing steps means that, when using the same temperature and pressure at the curing locations, the production velocity is increased by a factor three with respect to the case, in which only one curing location is supplied. It is possible now to ensure that each curing step lasts at most about 1 minute. Such a curing time at each curing location renders a profitable production.
  • each pear of sheets to be welded together is covered with adhesive and the other is covered with hardener.
  • the adhesive is a ureaformaldehyde adhesive. With the method according to the invention such an adhesive renders a good quality welding joint.
  • the apparatus for carrying out a method according to the invention is characterised by a conveyor for the sheets to be welded together and a number of curing means that, in the conveying direction, are positioned at regular distances that correspnd with the length of the sheets.
  • the said curing means can simultaneously engage at joining welding seams, such that the respective curing steps may occur simultaneously.
  • the conveyor intermittently conveys the sheets over a distance that is equal to their length wherein the curing means are activatable when the conveyor is at a standstill.
  • the intermittent motion of the conveyor has as result, that a welding seam to be cured is always precisely positioned below a curing means, whereafter this curing means is activated.
  • the curing means is disactivated and the conveyor again conveyes the sheets about the mentioned distance. Then a new curing step occurs.
  • each welding seam successively passes the successive curing means, such that curing occurs in the respective amount of steps.
  • the curing means comprise heatable pressures heads. These pressure heads then can be engaged with the welding seams, if the conveyor is at a stand still.
  • the apparatus according to the invention comprises three curing means.
  • the apparatus for welding together sheets of woody material illustrated in the figure comprises a conveyor 1 for conveying the sheets 2 to be welded together.
  • the conveyor 1 conveyes the sheets in a figure from left to right.
  • the conveyor 1 comprises an endless conveying belt; however all know types of conveyors are applicable.
  • the conveyor 1 is mounted in a frame 3 that supports all parts of the apparatus.
  • a stock means 4 is provided for a pile of sheets 2.
  • an only schematically represented lifting apparatus 5 is provided, that guarantees that the upper most sheet 2 of the pile of sheets is always at the level of the conveyor 1.
  • the stock means 4 further is provided with a transferring device 6 for transferring the upper most sheet 2 of the pile from the pile of sheets 2 of the stock means 4 to the conveyor 1.
  • the transferring device 6 engages with a pressure means 7 the end of the upper most sheet 2 directed away from the conveyor 1. Activation of the transferring device 6 then leads to shifting the upper most sheet 2 to the right, until it engages with its opposite end a previous sheet 2 already present on the conveyor 1.
  • the apparatus comprises means to cover the ends of each sheet 2 with an appropriate adhesive.
  • the pressure means 7 covers the respective end of the sheet 2 with adhesive
  • an additional application means 8 applies a hardener on the opposite end.
  • the conveyor 1 three pressure heads 9, 10 and 11 are provided.
  • the mutual distance between the pressure heads 9 and 10 as well as 10 and 11, respectively, corresponds with the length of the sheets 2 to be processed.
  • the pressure heads 9, 10 and 11 are movable up and down by means of motion means such as cilinder-piston assemblies 12.
  • the cilinder-­piston assemblies 12 are mounted in the frame 3.
  • a counter pressure plate 13 is provided below each pressure head 9, 10 and 11, at the opposite side of the conveyor 1, that together with the respective pressure head creates the required pressure.
  • the pressure heads 9, 10 and 11 are provided with a heating device.
  • the apparatus operates as follows: with the aid of the stock means 4 and the transferring device 6 the sheets 2 are transferred from the pile present in the stock means 4 towards the conveyor 1.
  • the adhesive and hardener applied by means of the pressure means 7 and the application means 8 then constitute welding seams 14 and 17 between adjoining sheets 2.
  • the conveyor 1 is activated that long in each case until the welding seams are positioned below the pressure heads 9, 10 and 11.
  • the conveyor 1 is stopped, whereafter the pressure heads all are activated and excert the required pressure upon the welding seams.
  • a partial curing process occurs at each welding seam.
  • the pressure heads are removed from the welding seams and the conveyor 1 is activated again, until the totall assembly of adjoining sheets 2 is shifted to the right (as seen in the figure) over one sheet lenght.
  • the pressure heads 9, 10 and 11 are activated again. This process is continually repeated.
  • the welding seam 16 illustrated in the figure that is located now at the pressure head 11 is subjected to the last curing step.
  • the welding seam 15 now is subjected to the second curing step after this welding seam being subjected to the pressure head 9 during the previous curing step.
  • welding seam 14 is subjected now to the first curing step by the pressure head 9.
  • a welding seams which has passed all pressure heads has resulted in a complete joint between two adjoining sheets 2. See for example welding seam 17.
  • the sheet assembly obtained like this then can be cut to the desired dimensions by means of an apparatus not shown further.
  • the total curing time for each welding seam equals the total of the separate curing times at the pressure heads 9, 10 and 11. Because these pressure heads operate simultaneously the velocity, with which the sheets 2 are conveyed by the conveyor 1 is substantially increased with a factor three compared to an apparatus, in which only one pressure head completes the complete curing.
  • the hardener applied on one of the ends of the sheets 2 is a ureaformaldehyde adhesive.
  • the hardener used for example can be a fast hardener, as commercially available.
  • the presses are heated, for example to a temperature of 200 °C. This heating can be electric.
  • the curing time at each press preferably is about one minute.
  • the invention is not limited to the embodiment described before, that can be varied widely withing the scoop of the invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP19900201527 1989-06-14 1990-06-13 Méthode et dispositif pour souder entre elles des plaques de matière ligneuse Withdrawn EP0403024A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901501A NL8901501A (nl) 1989-06-14 1989-06-14 Werkwijze en inrichting voor het aan elkaar lassen van uit houtachtig materiaal bestaande platen.
NL8901501 1989-06-14

Publications (1)

Publication Number Publication Date
EP0403024A1 true EP0403024A1 (fr) 1990-12-19

Family

ID=19854831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900201527 Withdrawn EP0403024A1 (fr) 1989-06-14 1990-06-13 Méthode et dispositif pour souder entre elles des plaques de matière ligneuse

Country Status (2)

Country Link
EP (1) EP0403024A1 (fr)
NL (1) NL8901501A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677692A1 (fr) * 1991-06-11 1992-12-18 Gauthier Sa Paul Poutre economique en lamelle-colle, procede de fabrication et machine pour le mettre en óoeuvre.
DE19737593C1 (de) * 1997-08-28 1999-03-04 Kuper Heinrich Gmbh Co Kg Verfahren und Vorrichtung zum Verkleben von Furnierstreifen
WO2004104125A1 (fr) * 2003-05-14 2004-12-02 L & L Products, Inc. Procede pour coller des elements et ensemble ainsi assemble
EP2006339A1 (fr) * 2007-06-20 2008-12-24 Mazda Motor Corporation Procédé d'assemblage de pièces travaillées
WO2010108497A1 (fr) * 2009-03-27 2010-09-30 Lm Glasfiber A/S Procédé et appareil de découpe de bandes de balsa
FR2960814A1 (fr) * 2010-06-07 2011-12-09 Agronomique Inst Nat Rech Procede d'assemblage de pieces en materiau ligno-cellulosique
CN106945136A (zh) * 2017-04-27 2017-07-14 连云港美步家居有限公司 拼板机、拼板机构及拼板系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE487545A (fr) *
US1601265A (en) * 1924-04-05 1926-09-28 Schlesinger Georg Apparatus for manufacturing bands of veneer
US2591771A (en) * 1950-06-09 1952-04-08 Nat Casein Company Method of gluing a plurality of wooden elements comprising curing a urea formaldehyde adhesive by means of high-frequency heating
US3481376A (en) * 1967-07-31 1969-12-02 Pollatch Forests Inc Continuous press for curing scarfed veneer joints
NL7500965A (nl) * 1974-03-11 1975-09-15 Weyerhaeuser Co Vloeibaar, met water verdunbaar fenol-formal- dehyde-resorcinol harsmengsel.
US4500385A (en) * 1984-04-06 1985-02-19 Waggoner Dennis H Lumber assembly machine
GB2189431A (en) * 1986-04-16 1987-10-28 Rilin Investments Joining panels

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE487545A (fr) *
US1601265A (en) * 1924-04-05 1926-09-28 Schlesinger Georg Apparatus for manufacturing bands of veneer
US2591771A (en) * 1950-06-09 1952-04-08 Nat Casein Company Method of gluing a plurality of wooden elements comprising curing a urea formaldehyde adhesive by means of high-frequency heating
US3481376A (en) * 1967-07-31 1969-12-02 Pollatch Forests Inc Continuous press for curing scarfed veneer joints
NL7500965A (nl) * 1974-03-11 1975-09-15 Weyerhaeuser Co Vloeibaar, met water verdunbaar fenol-formal- dehyde-resorcinol harsmengsel.
US4500385A (en) * 1984-04-06 1985-02-19 Waggoner Dennis H Lumber assembly machine
GB2189431A (en) * 1986-04-16 1987-10-28 Rilin Investments Joining panels

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677692A1 (fr) * 1991-06-11 1992-12-18 Gauthier Sa Paul Poutre economique en lamelle-colle, procede de fabrication et machine pour le mettre en óoeuvre.
DE19737593C1 (de) * 1997-08-28 1999-03-04 Kuper Heinrich Gmbh Co Kg Verfahren und Vorrichtung zum Verkleben von Furnierstreifen
WO2004104125A1 (fr) * 2003-05-14 2004-12-02 L & L Products, Inc. Procede pour coller des elements et ensemble ainsi assemble
EP2006339A1 (fr) * 2007-06-20 2008-12-24 Mazda Motor Corporation Procédé d'assemblage de pièces travaillées
WO2010108497A1 (fr) * 2009-03-27 2010-09-30 Lm Glasfiber A/S Procédé et appareil de découpe de bandes de balsa
CN102365170A (zh) * 2009-03-27 2012-02-29 Lm玻璃纤维制品有限公司 用于切割出轻木垫部分的方法和装置
US8808491B2 (en) 2009-03-27 2014-08-19 Lm Glasfiber A/S Method and apparatus for cutting out balsa blanket parts
CN102365170B (zh) * 2009-03-27 2014-08-27 Lm玻璃纤维制品有限公司 用于切割出轻木垫部分的方法和装置
FR2960814A1 (fr) * 2010-06-07 2011-12-09 Agronomique Inst Nat Rech Procede d'assemblage de pieces en materiau ligno-cellulosique
WO2011154652A3 (fr) * 2010-06-07 2012-04-05 Institut National De La Recherche Agronomique - Inra Procede d'assemblage de pieces en materiau ligno-cellulosique
CN106945136A (zh) * 2017-04-27 2017-07-14 连云港美步家居有限公司 拼板机、拼板机构及拼板系统

Also Published As

Publication number Publication date
NL8901501A (nl) 1991-01-02

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