EP0822042A2 - Process and machine for manufacturing shaped profiles in curved plywood for covering columns and the like - Google Patents

Process and machine for manufacturing shaped profiles in curved plywood for covering columns and the like Download PDF

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Publication number
EP0822042A2
EP0822042A2 EP97202352A EP97202352A EP0822042A2 EP 0822042 A2 EP0822042 A2 EP 0822042A2 EP 97202352 A EP97202352 A EP 97202352A EP 97202352 A EP97202352 A EP 97202352A EP 0822042 A2 EP0822042 A2 EP 0822042A2
Authority
EP
European Patent Office
Prior art keywords
press
sheets
machine
shaped profiles
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Withdrawn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
EP97202352A
Other languages
German (de)
French (fr)
Other versions
EP0822042A3 (en
Inventor
Benigno De Zanet
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.)
Xiloform SpA
Original Assignee
Xiloform SpA
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 Xiloform SpA filed Critical Xiloform SpA
Publication of EP0822042A2 publication Critical patent/EP0822042A2/en
Publication of EP0822042A3 publication Critical patent/EP0822042A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure
    • 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
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B27D1/083—Presses specially designed for making the manufacture of shaped plywood articles

Definitions

  • the present invention relates to a process and a machine for manufacturing shaped profiles in curved plywood for covering columns and alike.
  • the traditional process of manufacturing of shaped profiles in curved plywood for covering columns and alike provides for the overlay of several flat wooden sheets with interposed adhesive, that are made adhere to each other by means of a heated press of substantially semicircular section, which compresses said sheets one against the other determining the bending with a curvature radius correspondent to that of the press itself.
  • object of the present invention has been to provide a process and a machine specifically fit for manufacturing shaped profiles of considerable length in curved plywood.
  • a process for manufacturing shaped profiles in curved plywood comprising overlay of several flat wooden sheets with interposed adhesive and application of pressure over said overlaid sheets by means of a shaped press at high temperature for the mutual adhesion of the sheets themselves and their bending with a desired curvature radius, characterized in that said pressure is obtained by inflating an inflatable flexible sack which substains said flat sheets beneath said press.
  • a machine comprising a heated press of curved section correspondent to that desired for the profile to manufacture and means for providing a pressure engagement between said press and a set of wooden flat sheets overlaid together with interposed adhesive to determine the adhesion of the sheets themselves and their bending up to a desired shape, characterized in that said means for providing a pressure engagement comprise an inflatable flexible sack which substain said flat sheets beneath said press.
  • Fig. 1 is shown schematically in perspective view a set of wooden flat sheets 1, between a layer of adhesive 2 working at high temperature is interposed.
  • the set of fig. 1 is inserted in a machine comprising a shaped press 3, by way of example of semicircular section, heated at high temperature.
  • Beneath press 3 as shown in Fig. 2, an inflatable flexible sack 5, initially deflated, which supports the set of wooden overlaid sheets 1 of Fig. 1, is placed inside an envelope 4.
  • the edge bending can naturally be modified by varying the front shape of press 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Laminated Bodies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

A process and a machine for manufacturing shaped profiles in curved plywood are described .A set of flat wooden sheets (1) with interposed adhesive (2) is submitted at temperature and pressure by means of a shaped press (3) at high temperature which determines the mutual adhesion of the sheets and their bending up to the desired shape. Said pressure is obtained by means of inflating an inflatable flexible sack (5) which substains said flat sheets (1) beneath said press (3).

Description

The present invention relates to a process and a machine for manufacturing shaped profiles in curved plywood for covering columns and alike.
The traditional process of manufacturing of shaped profiles in curved plywood for covering columns and alike provides for the overlay of several flat wooden sheets with interposed adhesive, that are made adhere to each other by means of a heated press of substantially semicircular section, which compresses said sheets one against the other determining the bending with a curvature radius correspondent to that of the press itself.
The application of the adhering and bending pressure by means of the press is troublesome in the case of shaped profiles of considerable length.
As a matter of fact, a high pressure over a wide surface demands for the application of a higher force which is often difficult to obtain.
Moreover, if the wood thickness along the extension of the sheets is not perfectly uniform, structural imperfections occur able to affect the final appearance of the finished profile.
To face this state of the art, object of the present invention has been to provide a process and a machine specifically fit for manufacturing shaped profiles of considerable length in curved plywood.
In view of that object a process for manufacturing shaped profiles in curved plywood has been provided, comprising overlay of several flat wooden sheets with interposed adhesive and application of pressure over said overlaid sheets by means of a shaped press at high temperature for the mutual adhesion of the sheets themselves and their bending with a desired curvature radius, characterized in that said pressure is obtained by inflating an inflatable flexible sack which substains said flat sheets beneath said press.
Correspondently, in order to carry out the process according to the invention a machine has been provided comprising a heated press of curved section correspondent to that desired for the profile to manufacture and means for providing a pressure engagement between said press and a set of wooden flat sheets overlaid together with interposed adhesive to determine the adhesion of the sheets themselves and their bending up to a desired shape, characterized in that said means for providing a pressure engagement comprise an inflatable flexible sack which substain said flat sheets beneath said press.
With the process and the machine according to the invention the wooden overlaid sheets, even if of considerable length, are submitted under any desired pressure, which is able to adapt itself to possible small differences of the sheet thickness, thus originating an absolutely perfect curved finished profile.
A machine according to the invention is shown schematically in the enclosed drawings and will now be described by way of example which does not limit the field of the invention as claimed further.
In the drawings :
  • Fig. 1 shows schematically in perspective view a set of wooden flat sheets overlaid with interposed adhesive before being inserted in a machine according to the invention;
  • Fig. 2 shows schematically a machine according to the invention loaded with a set of overlaid sheets as the one of fig. 1;
  • Fig. 3 shows said machine in the step of manufacturing a profile in curved plywood;
  • Fig.4 shows in cross section a profile in curved plywooden manufactured by the machine of Figures 2-3.
    • In Fig. 1 is shown schematically in perspective view a set of wooden flat sheets 1, between a layer of adhesive 2 working at high temperature is interposed.
    According to the invention, if the object is to provide a profile in curved plywood , by way of example for covering a column, the set of fig. 1 is inserted in a machine comprising a shaped press 3, by way of example of semicircular section, heated at high temperature.
    Beneath press 3, as shown in Fig. 2, an inflatable flexible sack 5, initially deflated, which supports the set of wooden overlaid sheets 1 of Fig. 1, is placed inside an envelope 4.
    Successively, as shown in Fig. 3, compressed air is forced inside the flexible sack 5, which swells pushing the set of wooden sheets 1 against the curved press 3.
    Thus the bending of sheets 1 is obtained, up to a shape correspondent to that of the press 3, as shown in Fig. 3.
    At the end of the process the profile in curved plywood is obtained, which is shown in Fig.4.
    The edge bending can naturally be modified by varying the front shape of press 3.

    Claims (4)

    1. Process for manufacturing shaped profiles in curved plywood, comprising overlay of several flat wooden sheets (1) with interposed adhesive (2) and application of pressure against said overlaid sheets (1) by means of a shaped press (3) at high temperature for the mutual adhesion of the sheets themselves and their bending with a desired curvature radius, characterized in that said the press (3) is obtained by inflating an inflatable flexible sack (5) which substains said flat sheets (1) beneath said press (3).
    2. Process according to claim 1, characterized in that said press (3) has a substantially semicircular section.
    3. Machine for manufacturing shaped profiles in curved plywood, comprising a heated press (3) of curved section correspondent to that desired for the profile to manufacture and means (5) for providing a pressure engagement between said press (3) and a set of wooden flat sheets (1) overlaid together with interposed adhesive (2) to determine the adhesion of the sheets themselves and their bending up to a desired shape, characterized in that said means (5) for providing a pressure engagement comprise an inflatable flexible sack (5) which substains said flat sheets (1) beneath said press (3).
    4. Machine according to claim 3, characterized in that said press (3) has a substantially semicircular section.
    EP97202352A 1996-07-31 1997-07-25 Process and machine for manufacturing shaped profiles in curved plywood for covering columns and the like Withdrawn EP0822042A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    ITMI961643 1996-07-31
    IT96MI001643A IT1283376B1 (en) 1996-07-31 1996-07-31 PROCEDURE AND MACHINE FOR THE MANUFACTURE OF CURVED PLYWOOD PROFILES FOR THE CLADDING OF COLUMNS AND SIMILAR.

    Publications (2)

    Publication Number Publication Date
    EP0822042A2 true EP0822042A2 (en) 1998-02-04
    EP0822042A3 EP0822042A3 (en) 1999-03-24

    Family

    ID=11374723

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97202352A Withdrawn EP0822042A3 (en) 1996-07-31 1997-07-25 Process and machine for manufacturing shaped profiles in curved plywood for covering columns and the like

    Country Status (2)

    Country Link
    EP (1) EP0822042A3 (en)
    IT (1) IT1283376B1 (en)

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102004035758B4 (en) * 2004-07-23 2009-08-27 Quin Gmbh Method and device for producing a decorative preform
    CN106193297A (en) * 2016-07-11 2016-12-07 南京林业大学 A kind of c-type wooden structures material for building and preparation method thereof
    CN108068382A (en) * 2016-11-14 2018-05-25 江西昌河航空工业有限公司 A kind of frock and adhesive technology for being glued V-type part

    Citations (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR769094A (en) * 1934-02-03 1934-08-18 Veneer press for rounded surfaces
    FR873210A (en) * 1940-04-22 1942-07-02 Fieseler Gerhard Werke Gmbh Gluing press for curved parts, in particular for parts of aircraft or the like
    US2363933A (en) * 1940-12-12 1944-11-28 Langley Aviat Corp Portable veneer press
    US2385544A (en) * 1943-05-19 1945-09-25 Salisbury Leonard Byron Molding device
    US2386578A (en) * 1941-08-14 1945-10-09 Vidal Corp Apparatus for forming laminated molded structures
    US2401299A (en) * 1942-10-03 1946-06-04 Universal Moulded Products Cor Molding and gluing press
    US2409393A (en) * 1943-07-29 1946-10-15 Schaffer Leslie Laszlo Fluid press
    FR1192718A (en) * 1958-03-06 1959-10-28 Veneer press
    EP0568935A1 (en) * 1992-05-05 1993-11-10 ORMAMACCHINE S.r.L. Veneering machine

    Patent Citations (9)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR769094A (en) * 1934-02-03 1934-08-18 Veneer press for rounded surfaces
    FR873210A (en) * 1940-04-22 1942-07-02 Fieseler Gerhard Werke Gmbh Gluing press for curved parts, in particular for parts of aircraft or the like
    US2363933A (en) * 1940-12-12 1944-11-28 Langley Aviat Corp Portable veneer press
    US2386578A (en) * 1941-08-14 1945-10-09 Vidal Corp Apparatus for forming laminated molded structures
    US2401299A (en) * 1942-10-03 1946-06-04 Universal Moulded Products Cor Molding and gluing press
    US2385544A (en) * 1943-05-19 1945-09-25 Salisbury Leonard Byron Molding device
    US2409393A (en) * 1943-07-29 1946-10-15 Schaffer Leslie Laszlo Fluid press
    FR1192718A (en) * 1958-03-06 1959-10-28 Veneer press
    EP0568935A1 (en) * 1992-05-05 1993-11-10 ORMAMACCHINE S.r.L. Veneering machine

    Cited By (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102004035758B4 (en) * 2004-07-23 2009-08-27 Quin Gmbh Method and device for producing a decorative preform
    DE102004035758C5 (en) * 2004-07-23 2011-08-18 Quin GmbH, 71277 Method and device for producing a decorative preform
    CN106193297A (en) * 2016-07-11 2016-12-07 南京林业大学 A kind of c-type wooden structures material for building and preparation method thereof
    CN106193297B (en) * 2016-07-11 2019-04-02 南京林业大学 A kind of c-type wooden structures material for building and preparation method thereof
    CN108068382A (en) * 2016-11-14 2018-05-25 江西昌河航空工业有限公司 A kind of frock and adhesive technology for being glued V-type part

    Also Published As

    Publication number Publication date
    EP0822042A3 (en) 1999-03-24
    IT1283376B1 (en) 1998-04-17
    ITMI961643A0 (en) 1996-07-31
    ITMI961643A1 (en) 1998-01-31

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