EP0047284B1 - A method of manufacturing a veneer article by hot pressing - Google Patents

A method of manufacturing a veneer article by hot pressing Download PDF

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Publication number
EP0047284B1
EP0047284B1 EP81900660A EP81900660A EP0047284B1 EP 0047284 B1 EP0047284 B1 EP 0047284B1 EP 81900660 A EP81900660 A EP 81900660A EP 81900660 A EP81900660 A EP 81900660A EP 0047284 B1 EP0047284 B1 EP 0047284B1
Authority
EP
European Patent Office
Prior art keywords
veneer
central panel
edge
transition zone
zone
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
Application number
EP81900660A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0047284A1 (en
Inventor
Tommy Lykke Christensen Smedegard
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.)
Fowo I Nybro AB
Original Assignee
Fowo I Nybro AB
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 Fowo I Nybro AB filed Critical Fowo I Nybro AB
Priority to AT81900660T priority Critical patent/ATE10598T1/de
Publication of EP0047284A1 publication Critical patent/EP0047284A1/en
Application granted granted Critical
Publication of EP0047284B1 publication Critical patent/EP0047284B1/en
Expired 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
    • 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
    • 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 method of manufacturing, by hot-pressing, a polygonal article comprising a single veneer ply or a plurality of adhesively bonded veneer plies, said article having a flat or substantially flat, circumferential edge zone, a polygonal central panel and a strongly profiled transition zone connecting the edge zone and the central panel.
  • the method of the invention is characterized in that the outermost veneer ply of the finished article comprises, along each side of the central panel, an edge panel forming at least the edge zone along that side, and in which the grain extends in the direction of the adjoining side of the central panel, and in that prior to the hot-pressing operation said outermost veneer ply is produced by joining flat edge panels edgewise to a flat central panel in the plane of the central panel, and in that said flat edge panels are manufactured with such a shape that at each corner of the central panel there is formed a gap consisting of a wedge-shaped portion which extends through the regions of the edge panels which form the transition zone of the finished article, with its apex located at the corner of the finished central panel, and an adjoining portion having opposed parallel edges extending through the regions of the edge panels which form the edge zone of the finished article to the outer periphery thereof.
  • both the edge zones and the transition zones are formed by the edge panels and the said gaps lie between adjoining edge panels.
  • FR-A-1,358,646 discloses a similar method of forming a tray from a flat workpiece consisting of a plurality of superposed veneer plies in which non-overlapping angular cut-outs are formed at each corner of each ply prior to the lamination and pressing of the plies.
  • This known method suffers from the same disadvantage as the method disclosed in GB-A-485,071.
  • Figs. 1 and 2 there has been illustrated a sandwich element 1 consisting of a core 2, edge strips 3 along the sides of the core, and two veneer facing sheets 4 and 5 in engagement with and bonded to the opposed surfaces of core 2 and to the edge strips 3 such that they extend to the edges of the element.
  • Core 2 can consist of a foamed plastic material with or without a filler or it can be made as a slab of chipboard.
  • In the drawing element 1 has been shown with a profiled facing sheet 4 and a planar facing sheet 5 but if desired both facing sheets could be profiled with the same or with different cross-section profile.
  • facing sheet 4 is composed of three adhesively bonded veneer plies, viz. a ply 6 of noble veneer which in the finished sandwich element is outwardly oriented, and two so-called backing plies 7 and 8 which can be made of cheaper veneer.
  • outer veneer ply 6 is composed of a central panel 9 and separate edge panels 10 and 11 extending along the longer and shorter sides, respectively, of the central panel and adhesively bonded thereto. The edge panels are cut from the veneer in such a way that within each panel the grain extends by and large in the direction of the edges of the finished facing sheet 4 whereby the corresponding edge panels of the facing sheet of the finished sandwich element, which in Fig. 1 have been designated by 10' and 11', respectively, give the appearance of solid edge strips surrounding a central panel.
  • the press tool for compression-moulding facing sheet 4 as shown schematically in Fig. 4, comprises a lower tool 12 and an upper tool 13 which both include means (not shown) for heating the tool.
  • Each of the two tool parts is mounted on an associated platen 14 and 15, respectively.
  • the pressing surfaces of toos 12 and 13, which are oriented towards one another, have been profiled corresponding to the desired shape of the finished facing sheet 4 with a flat circumferential edge zone 16 comprising panels 10' and 11', the weakly profiled central panel 9' and a strongly profiled transition zone 17 (see in particular Fig. 2) intermediate the edge zone and the central panel. It will be understood from Figs.
  • edge panels 10 and 11 of the initial flat veneer ply 6 are shaped as shown in Fig. 3. This implies that at each corner of the flat veneer ply there is a gap which from the periphery of the veneer ply extends inwardly with parallel edges in a rectilinear portion 18 by and large to that point which in the finished article constitutes the exterior corner of transition zone 17. From there the gap continues as a wedge-shaped portion 19 terminating in an apex at the interior corner of transition zone 17, i.e. at the corner of central panel 9.
  • part of upper tool 13, which moulds the strongly profiled transition zone 17 and the adjoining, less strongly profiled area of the central panel 9' of the facing sheet, has been made as a separate, frame-like member composed of bars 20 extending parallel to the edges of the workpiece and guided relative to the remainder of the upper tool in such a way that the frame is separately movable towards and away from the lower tool.
  • the frame is spring loaded towards the lower tool by means of schematically shown compression springs 21 operative between the frame and platen 15.
  • the three veneer plies 6, 7, and 8 are inserted in flat state into the open press tool together with intermediate adhesive films (not shown) which become activated at the pressing force and temperature so that the bonding and the compression moulding take place in one operation.
  • the intermediate adhesive films could be replaced by an application of adhesive onto the veneer surfaces. In both cases it is advisable to apply to the outwardly oriented surface of the external ply 6 a thin film of a material, which by the application of heat and pressure becomes hard and tough, in order to ensure a smooth surface of the finished facing sheet.
  • the lower tool shown can be replaced by the prefabricated core with edge strips and one of the facing sheets glued thereto whereby the opposed facing sheet is pressed and bonded to the core in one operation.
  • the compression moulded facing sheet may often consist of one veneer ply only.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
EP81900660A 1980-03-04 1981-03-02 A method of manufacturing a veneer article by hot pressing Expired EP0047284B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81900660T ATE10598T1 (de) 1980-03-04 1981-03-02 Verfahren zur herstellung eines furnierartikels durch heisspressen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK92780A DK147173C (da) 1980-03-04 1980-03-04 Fremgangsmaade ved fremstilling af en polygonal finergenstand ved varmpresning
DK927/80 1980-03-04

Publications (2)

Publication Number Publication Date
EP0047284A1 EP0047284A1 (en) 1982-03-17
EP0047284B1 true EP0047284B1 (en) 1984-12-05

Family

ID=8099103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81900660A Expired EP0047284B1 (en) 1980-03-04 1981-03-02 A method of manufacturing a veneer article by hot pressing

Country Status (8)

Country Link
EP (1) EP0047284B1 (no)
BE (1) BE887769A (no)
DK (1) DK147173C (no)
ES (1) ES8207016A1 (no)
IE (1) IE810382L (no)
IT (1) IT1169231B (no)
NO (1) NO151692C (no)
WO (1) WO1981002541A1 (no)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08267592A (ja) * 1995-03-31 1996-10-15 Sintokogio Ltd 加飾体貼着装置
NO965205A (no) * 1996-12-05 1997-09-22 Fredrik Torsteinsen Laminert gjenstand og form til fremstilling av en laminert gjenstand

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112558C (no) *
US1700391A (en) * 1925-06-02 1929-01-29 United Piano Corp Sounding-board press
GB293248A (en) * 1927-10-31 1928-07-05 Christian Woellmer Process for the production of articles of furniture having surfaces curved in more than one direction
US1876330A (en) * 1932-01-29 1932-09-06 Emil C Loetscher Method of molding table tops and the like
GB485071A (en) * 1937-08-06 1938-05-13 Eric Winston Barlow Improvements in and relating to the veneering of wood and the like
GB545489A (en) * 1940-10-22 1942-05-28 Arthur Cyril Merron Compound sheet materials and objects produced therefrom
GB582478A (en) * 1946-02-01 1946-11-18 Marcelle Jeanne Lyon Improvements in and relating to the making of plywood and like articles
US2640517A (en) * 1950-11-13 1953-06-02 Mello Ruben De Apparatus for manufacture of corrugated plywood
GB840640A (en) * 1957-07-19 1960-07-06 Dolphin & Company Ltd Improvements relating to the manufacture of laminated articles
US3066725A (en) * 1958-06-12 1962-12-04 Gertrude M Schweitzer Apparatus for prefabricating coving
FR1358646A (fr) * 1963-03-08 1964-04-17 Procédé de fabrication de corps creux et corps creux ainsi obtenus

Also Published As

Publication number Publication date
EP0047284A1 (en) 1982-03-17
NO151692B (no) 1985-02-11
NO151692C (no) 1985-05-22
IE810382L (en) 1981-09-04
DK147173B (da) 1984-05-07
ES500067A0 (es) 1982-09-01
DK147173C (da) 1984-11-05
WO1981002541A1 (en) 1981-09-17
BE887769A (fr) 1981-09-03
IT8120118A0 (it) 1981-03-04
ES8207016A1 (es) 1982-09-01
IT1169231B (it) 1987-05-27
NO813675L (no) 1981-10-30
DK92780A (da) 1981-09-05

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