EP2184142A1 - Gewölbte Holzplatte aus Latten und Verfahren zur dessen Herstellung - Google Patents

Gewölbte Holzplatte aus Latten und Verfahren zur dessen Herstellung Download PDF

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Publication number
EP2184142A1
EP2184142A1 EP09012592A EP09012592A EP2184142A1 EP 2184142 A1 EP2184142 A1 EP 2184142A1 EP 09012592 A EP09012592 A EP 09012592A EP 09012592 A EP09012592 A EP 09012592A EP 2184142 A1 EP2184142 A1 EP 2184142A1
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EP
European Patent Office
Prior art keywords
slats
panel
wood
folding
curved
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Withdrawn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
EP09012592A
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English (en)
French (fr)
Inventor
Yvan Baillargeon
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Individual
Original Assignee
Individual
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Publication date
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Publication of EP2184142A1 publication Critical patent/EP2184142A1/de
Withdrawn legal-status Critical Current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
    • B27H—BENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
    • B27H1/00—Bending wood stock, e.g. boards
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
    • E04C2/12—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of solid wood
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/328—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material slightly bowed or folded panels not otherwise provided for
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/40—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of a number of smaller components rigidly or movably connected together, e.g. interlocking, hingedly connected of particular shape, e.g. not rectangular of variable shape or size, e.g. flexible or telescopic panels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material

Definitions

  • Curved wood panels are used in the manufacture of chair backs, casket lids, boat hulls, furniture doors and cabinets and wooden drawers, to name just a few examples. Some curved wood panels, such as chair backs, are bent along the length of the grain, either longitudinally. It can be said that other curved wooden panels, such as coffin lids, have slats parallel to the axis of the vault, and are bent transversely.
  • the production of longitudinally curved wood panels involves bending or bending the wood.
  • the bending, or folding, of wood is a delicate operation that requires good control of the process and a good knowledge of the properties of solid wood.
  • Green wood that is, freshly cut wood, is usually easier to bend than wood that has been dried in an oven.
  • the wood may be exposed to steam, or be immersed in water, before bending it to reduce the likelihood of cracking or cracking.
  • the folding can be done in various ways, for example by the use of a template or by the use of a press.
  • the panel can be bent longitudinally, transversely, or both.
  • Wooden panels can be solid wood panels.
  • FIG. 1 an example of a blockboard glued flat 10 before being folded is shown. It consists of a number of slats 12 solid wood, glued between her singing on vocals. This type of panel can be folded longitudinally or transversely, for example.
  • FIG. 2 an example of a longitudinally curved panel 110 is shown.
  • the panel 110 consists of 6 solid slats 112, 114, 116, 118, 120, 122 of solid wood which are assembled edge to edge. Parts 112, 114, 116, 118, 120, 122 are bent lengthwise about axis 124 and can be said to be that the curved panel 110 "is longitudinally folded". This type of panel can be used to make a chair back, for example.
  • a transversely curved panel 210 is shown. It consists of a number of slats 212 solid wood glued in parallel and oriented along the axis 218. We can say that in this way, the panel is "transversely folded". This type of panel can be used to make a casket lid, for example.
  • FIG. 4 There is a flowchart that illustrates the simplified process used to make a blockboard that will be bent longitudinally, transversely, or obliquely. As illustrated, the folding step is made after the paneling step. During the paneling stage, a certain amount of slats is used to assemble the board by various techniques, but it must be ensured that the joints are well glued using an appropriate glue.
  • Fig. 5 there is an organization chart that illustrates the detailed process used to make a blockboard of solid wood, bent longitudinally.
  • FIG. 6 there is an organization chart that illustrates the detailed process used to make a blockboard in solid wood, bent transversely. A set of tests was thus performed to validate the principle of longitudinal folding and transverse folding. For each test, panels were bent using a similar process. Each of the trials was conducted according to the processes illustrated in figures 5 and 6 depending on whether it is a longitudinal or transverse bend. Variables in the overall process were brought from one test to another, as shown in the following tables, to obtain the best result. No. of tests TH% Wood moisture Wood essence Steaming Min.
  • Fig. 5 For longitudinal bending, the general process used in each of the 4 tests is represented at Fig. 5 .
  • the method involves the use of a series of yellow air dried birch planks having a thickness of 4/4 and a variable width.
  • the category of yellow birch planks is selected, SAP, having a pale face (example face of heartwood).
  • SAP yellow birch planks
  • TH% hygroscopic humidity level
  • each panel is made by gluing a variable amount of slats of varying widths edge to edge with the glue shown in the table above. It is good to note that all panels are flat after gluing, before being folded. Gluing the panel is done directly in the steaming chamber by putting it in greenhouses. The heat, 85-90 degrees Celsius, in the bake chamber, contributed to the hardening of the glue during the 15 or 30 minute steaming step according to the test. A total of ten panels were made for each test.
  • the paneling was followed by a step of dimensioning the panels.
  • the panels were glided to 13/16 inch and cut to a specific length to fit the compression sheet when used.
  • Each panel was then folded into a hydraulic press on a mold.
  • the type of used press is indicated in the table above.
  • a compression plate has been used during folding, this is indicated in the folding compression column also in this table.
  • the folded panels were subsequently allowed to dry naturally under normal atmospheric conditions (hygroscopic balance of 6 to 8%).
  • Fig. 6 For transverse folding, the general process used in each of the 4 tests is represented at Fig. 6 .
  • the method involves the use of a series of yellow air dried birch planks having a thickness of 4/4 and a variable width.
  • the yellow birch plank category is selected, SAP, with a pale face (heartwood-free face).
  • TH% hygroscopic humidity level
  • each panel is made by gluing a variable amount of slats of varying widths edge to edge with the glue shown in the table above.
  • the gluing of the panel was done in spider type greenhouses. It is good to note that all panels are flat after gluing, before being folded. The drying and curing time of the adhesive depends on the technical data sheet of the glue manufacturer used. A total of ten panels were made for each test.
  • the paneling was followed by a step of dimensioning the panels.
  • the panels were hung at 13/16 inch and cut to a specific width to fit the compression sheet when used.
  • Each panel was steamed with a steam oven. This operation was carried out at 85-90 degrees Celsius for 15 or 30 minutes depending on experience.
  • Each panel was then folded into a hydraulic press on a mold.
  • the type of press used is indicated in the table above.
  • a compression sheet has been used during folding, this is indicated in the bending compression column, also in this table.
  • the folded panels were subsequently left to dry naturally, under normal atmospheric conditions (hygroscopic balance of 6 to 8%).
  • a compression sheet is intended to prevent stretching of the wood fiber on the convex face of the piece of wood or the panel to bend.
  • the panel In both ends of the sheet, there is a stop, the panel is then cut to a precise size at the exact distance between these 2 stops.
  • the sheet In the folding step, the sheet follows the panel in the press until the final form.
  • the radius of curvature is influenced by the thickness of the wood to be bent: the greater the thickness of the wood, the greater the radius of curvature must be.
  • Each panel was bent using a hydraulic bending press. The folded panels were subsequently allowed to dry naturally under normal atmospheric conditions (hygroscopic balance of 6 to 8%).
  • the deformation produced on the curved panels, after drying, is very minimal. Some straightening has occurred on the folded panels, but no more than what is normally intended for a single piece, that is, without gluing.
  • a very interesting fact is that the folding of a glued blockboard tolerates certain defects that the individual piece bending would not accept at the risk of bending breaks. For example, knots and slanted wood support the effect of folding when these pieces are glued together. Since these defects are not often found opposite each other, the defect-free slats support those who have them. We can therefore expect better and greater use of the wood resource.
  • folding the panel can advantageously save the step of having to machine an angle on the edges of the component parts.
  • to assemble a flat panel then to bend it can be realized in a short time, according to a simpler process than to assemble slats with angular edges for, later, to stick them in a mold, and to flush with the desired curvature.
  • Folding the panel can be done using other appropriate tools.
  • the use of rollers rather than a press may be appropriate in some situations.
  • a suitable adhesive may be a polyurethane adhesive, melamine containing urea formaldehyde with a catalyst, a white PVA type glue with a catalyst, to give only a few examples. Some glues should be avoided. In particular, I found that the exterior PVA glue from Lepage TM, as well as the PVA white glue without catalyst, were not appropriate, at least in some applications.
  • Hardwoods designated as hardwoods give better results than conifers in general. Wood such as African mahogany and eucalyptus or lyptus are preferably to be avoided.
  • the recommended wood species are the wood that is normally used in paneling and industrial folding. For some applications, the process can be started with already dry, kiln dried wood rather than using air-dried wood.
  • the panels After folding, the panels can finish drying freely, in ambient air, where still in an artificial dryer with controlled heat and humidity.
  • I curved panels made of solid wood slats with hygroscopic moisture ranging between 8 and 30% and between 1/8 and 1 7/8 inches thick, after steaming between 2 and 60 minutes before folding and having a radius of curvature greater than 2 inches, for example.
  • This new approach opens up great opportunities from a technical and economic point of view for manufacturers of curved items, such as wooden sports items, chair backs or kitchen cabinet doors, made of solid wood, by example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
EP09012592A 2008-10-15 2009-10-05 Gewölbte Holzplatte aus Latten und Verfahren zur dessen Herstellung Withdrawn EP2184142A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2641628A CA2641628C (fr) 2008-10-15 2008-10-15 Panneau latte courbe en bois massif et sa methode de fabrication

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EP2184142A1 true EP2184142A1 (de) 2010-05-12

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US (1) US8652292B2 (de)
EP (1) EP2184142A1 (de)
CA (1) CA2641628C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3061730A1 (fr) * 2017-01-09 2018-07-13 Kevin Rohart Panneaux isolants industriels tout en bois pour toutes constructions

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CN102247256B (zh) * 2011-06-29 2014-04-23 无锡澳美机械有限公司 一种棺盖拼板机
CN102284993A (zh) * 2011-08-04 2011-12-21 陈笑初 蚕桑树木芯细木工板及其生产方法
WO2016119059A1 (en) * 2015-01-30 2016-08-04 Fpinnovations Jointable arcuate veneer wood panels
US10041251B2 (en) * 2015-11-13 2018-08-07 Mid-Columbia Lumber Floor joist
CN107796189A (zh) * 2017-12-01 2018-03-13 国际竹藤中心 圆竹干燥与成型设备
BR102019003838A2 (pt) * 2019-02-25 2020-09-29 Cristovão Nobre De Sousa Equipamento e método para dobragem de painéis madeira de média densidade
KR20230020689A (ko) * 2021-08-04 2023-02-13 현대모비스 주식회사 리얼우드 시트를 구비한 차량용 크래쉬 패드 제작용 우드 프리포밍 장치
DE102022108895A1 (de) 2022-04-12 2023-10-12 Heimatbauen GmbH Raumbegrenzungsvorrichtung, Raumbegrenzung und Verfahren zur Herstellung einer Raumbegrenzungsvorrichtung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US413431A (en) * 1889-10-22 beetin
FR543950A (fr) * 1921-11-25 1922-09-12 Perfectionnements dans la fabrication des fûts, tonneaux, barils et foudres destinés surtout aux liquides spiritueux
GB655791A (en) * 1948-11-25 1951-08-01 Arthur Howard Borst Improvements in the manufacture of composite boards
SU375180A2 (de) * 1970-06-15 1973-03-23
SU1750947A1 (ru) * 1990-03-14 1992-07-30 Всесоюзный научно-исследовательский и конструкторский институт деревообрабатывающего машиностроения Способ изготовлени гнутоклееных деталей из древесины
WO1999020443A1 (en) * 1997-10-16 1999-04-29 Lindhe, Curt Novel material and process for its production
US20040250912A1 (en) * 2001-05-30 2004-12-16 Peer Haller Wood profile and method for the production of the same
DE102006009161A1 (de) * 2006-02-21 2007-08-23 Technische Universität Dresden Formteil aus Holz und Verfahren zu seiner Herstellung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US413431A (en) * 1889-10-22 beetin
FR543950A (fr) * 1921-11-25 1922-09-12 Perfectionnements dans la fabrication des fûts, tonneaux, barils et foudres destinés surtout aux liquides spiritueux
GB655791A (en) * 1948-11-25 1951-08-01 Arthur Howard Borst Improvements in the manufacture of composite boards
SU375180A2 (de) * 1970-06-15 1973-03-23
SU1750947A1 (ru) * 1990-03-14 1992-07-30 Всесоюзный научно-исследовательский и конструкторский институт деревообрабатывающего машиностроения Способ изготовлени гнутоклееных деталей из древесины
WO1999020443A1 (en) * 1997-10-16 1999-04-29 Lindhe, Curt Novel material and process for its production
US20040250912A1 (en) * 2001-05-30 2004-12-16 Peer Haller Wood profile and method for the production of the same
DE102006009161A1 (de) * 2006-02-21 2007-08-23 Technische Universität Dresden Formteil aus Holz und Verfahren zu seiner Herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199332, Derwent World Patents Index; AN 1993-256244, XP002564502 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3061730A1 (fr) * 2017-01-09 2018-07-13 Kevin Rohart Panneaux isolants industriels tout en bois pour toutes constructions

Also Published As

Publication number Publication date
CA2641628C (fr) 2011-10-11
CA2641628A1 (fr) 2009-06-18
US8652292B2 (en) 2014-02-18
US20100098895A1 (en) 2010-04-22

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