WO1986001142A1 - A method of fixing a wooden sheet of veneer to a supporting lamina - Google Patents

A method of fixing a wooden sheet of veneer to a supporting lamina Download PDF

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Publication number
WO1986001142A1
WO1986001142A1 PCT/FI1985/000069 FI8500069W WO8601142A1 WO 1986001142 A1 WO1986001142 A1 WO 1986001142A1 FI 8500069 W FI8500069 W FI 8500069W WO 8601142 A1 WO8601142 A1 WO 8601142A1
Authority
WO
WIPO (PCT)
Prior art keywords
veneer
sheet
lamina
wooden
pressing
Prior art date
Application number
PCT/FI1985/000069
Other languages
French (fr)
Inventor
Yrjö PAUKKUNEN
Eckhard Strahl
Original Assignee
Kallenmäki Oy
Strahl Ky
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 Kallenmäki Oy, Strahl Ky filed Critical Kallenmäki Oy
Priority to BR8507230A priority Critical patent/BR8507230A/en
Priority to HU853632A priority patent/HUT47475A/en
Priority to RO127057A priority patent/RO105371B1/en
Publication of WO1986001142A1 publication Critical patent/WO1986001142A1/en
Priority to DK166586A priority patent/DK166586A/en
Priority to FI870646A priority patent/FI870646A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying

Definitions

  • the invention relates to a method of fixing a wooden sheet of veneer to a supporting lamina.
  • a wooden sheet of veneer In hitherto known methods there used 0,7-1,7 mm thick wooden sheets of veneer, which are fixed to a supporting lamina. Before the fixing the sheets of veneer are dried, and in the next step the sheet of veneer is cemente to the lamina.
  • the planing or sanding of the veneer is carried out after fixing t sheet of veneer to the supporting lamina, because the glueing not been possible to carry out with very thin sheets of veneer to the fact that with a very thin sheet of veneer the glue wil penetrate through the sheet into the front surface of the vene That is why there has been a great loss of material in prior a methods.
  • the object of the present invention is to eliminate the above- mentioned disadvantages of known solutions for fixing a wooden sheet of veneer to a supporting lamina.
  • the moisture content of a newly felled tree is great enough for achieving the required humidity buffer. If the tree has dried due to the influence of air, the veneer should be moistured before the step of glueing. This could be achieved b dipping, for instance. It is also advantageous according to the invention to transport the veneer from the cutting station to t glueing station on a water cushion transporting device. By this transporting device the friction is very small and at the same time the veneer will be moistured.
  • the supporting lamina can be made of paper, plastic, fibreglass, woven, non-woven, plywood, hardboa gypsum board or wooden board.
  • the method of the invention it is achieved a very thin and strong, good-looking veneer without loss of material.
  • the method is also relatively inexpensive because of the very required steps. Also the achieved veneer reacts very little at changes of temperature and humidity due to its very small mass.
  • Fig. 1 is a sectional view of the sheet of veneer
  • Figs. 2-4 show the procedure with a scarf joint as a sectional view
  • Fig. 5 shows the scarf joint from the front surface of the ven
  • the sheets of veneer 3 are cut to a thicknes of 0,2-0,3 mm. If they have dried, they are first moistured an in the next step they are placed on the pre-glued 2 surface of supporting lamina 1.
  • the joints between adjacent sheets of ven can be made as butt joints or as scarf joints. If butt joints used, the edges of adjacent veneers are cut straight-lined, an the edges of the veneers are placed against each other. Scarf joints are described below referring to Figs. 2-4.
  • Fig. 1 there is shown the effect of the pressing 10 and the heat 11.
  • the moist of the veneer goes upwards, shown with reference number 12.
  • the glue 2 will penetrate into the dry cells 3' only for such a distance that the cells have dried.
  • the glue will not penetrate into the top of the veneer because the humidity buffer that is achieved by the moist veneer. At t same time the glue penetrates into the supporting lamina.
  • Figs. 2-4 there is shown a solution in which a scarf joint used for scarfing sheets of veneer to each other when fixing t on a supporting lamina 1.
  • Fig. 2 there is shown how the she of veneer 3 and 4 overlap.
  • Fig. 3 the heat pressing is performed as explained above, and in Fig. 4 the overlapping pa 8 of one of the sheets is removed. This can be achieved e.g. through blasting air with high pressure on the overlapping par of the sheet, whereby the dry edge 8 can be removed, and a qui good joint 9 is achieved.
  • Fig. 5 there is shown a solution whereby a scarf joint is used with a non-straight-lined joint 9.
  • the joint 9 fol the fibres of the tree and the joint will be very natural and imperceptible .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Laminated Bodies (AREA)
  • Finished Plywoods (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Die Bonding (AREA)

Abstract

A method of fixing a wooden sheet of veneer (3) to a supporting lamina (1). To avoid the great loss of material in known methods a very thin, 0,2-0,3 mm, sheet of veneer (3) is used. The sheet of veneer (3) is moist to form a humidity buffer which prevents the glue (2) from penetrating up to the front surface of the veneer during the glueing-step.

Description

A method of fixing a wooden sheet of veneer to a supporting lamina
The invention relates to a method of fixing a wooden sheet of veneer to a supporting lamina. In hitherto known methods there used 0,7-1,7 mm thick wooden sheets of veneer, which are fixed to a supporting lamina. Before the fixing the sheets of veneer are dried, and in the next step the sheet of veneer is cemente to the lamina. When a very thin sheet of veneer is wanted, the planing or sanding of the veneer is carried out after fixing t sheet of veneer to the supporting lamina, because the glueing not been possible to carry out with very thin sheets of veneer to the fact that with a very thin sheet of veneer the glue wil penetrate through the sheet into the front surface of the vene That is why there has been a great loss of material in prior a methods.
The object of the present invention is to eliminate the above- mentioned disadvantages of known solutions for fixing a wooden sheet of veneer to a supporting lamina.
This is achieved in accordance with the invention by a method which a moist, very thin, preferable 0,2-0,3 mm thick sheet of veneer is placed on a pre-glued surface of the supporting lami after which they are glued together and dried by using hot- pressing so that the humidity buffer which is achieved by the compression and the heat prevents the glue from penetrating u to the front surface of the veneer.
By means of this method it is achieved a thin sheet of veneer without any loss of material. Penetrating of the glue onto the front surface of the veneer is prevented by the humidity buff which is formed due to the moist veneer. By hot-pressing the of veneer to the supporting lamina the glue will penetrate in the back side of the veneer, and due to the heat it will dry fix the lamina to the veneer. Due to the moist of the veneer th humidity buffer will prevent the glue from damaging the front surface of the veneer. At the end of the hot-pressing the heat will also dry the upper, front surface of the veneer, but by th time the glue has already dried, and will not anymore penetrate up to the front surface of the veneer.
So as to prevent the water vapour from evaporating from the veneer during the step of hot-pressing it is advantageous to us a hermetically sealed planar press.
Usually the moisture content of a newly felled tree is great enough for achieving the required humidity buffer. If the tree has dried due to the influence of air, the veneer should be moistured before the step of glueing. This could be achieved b dipping, for instance. It is also advantageous according to the invention to transport the veneer from the cutting station to t glueing station on a water cushion transporting device. By this transporting device the friction is very small and at the same time the veneer will be moistured.
According to the invention the supporting lamina can be made of paper, plastic, fibreglass, woven, non-woven, plywood, hardboa gypsum board or wooden board.
According to the method of the invention it is achieved a very thin and strong, good-looking veneer without loss of material. The method is also relatively inexpensive because of the very required steps. Also the achieved veneer reacts very little at changes of temperature and humidity due to its very small mass.
The invention is described below in greater detail with refere to the accompanying drawings, in which Fig. 1 is a sectional view of the sheet of veneer,
Figs. 2-4 show the procedure with a scarf joint as a sectional view,
Fig. 5 shows the scarf joint from the front surface of the ven
In the first step the sheets of veneer 3 are cut to a thicknes of 0,2-0,3 mm. If they have dried, they are first moistured an in the next step they are placed on the pre-glued 2 surface of supporting lamina 1. The joints between adjacent sheets of ven can be made as butt joints or as scarf joints. If butt joints used, the edges of adjacent veneers are cut straight-lined, an the edges of the veneers are placed against each other. Scarf joints are described below referring to Figs. 2-4.
In Fig. 1 there is shown the effect of the pressing 10 and the heat 11. The moist of the veneer goes upwards, shown with reference number 12. The glue 2 will penetrate into the dry cells 3' only for such a distance that the cells have dried. The glue will not penetrate into the top of the veneer because the humidity buffer that is achieved by the moist veneer. At t same time the glue penetrates into the supporting lamina.
In Figs. 2-4 there is shown a solution in which a scarf joint used for scarfing sheets of veneer to each other when fixing t on a supporting lamina 1. In Fig. 2 there is shown how the she of veneer 3 and 4 overlap. In Fig. 3 the heat pressing is performed as explained above, and in Fig. 4 the overlapping pa 8 of one of the sheets is removed. This can be achieved e.g. through blasting air with high pressure on the overlapping par of the sheet, whereby the dry edge 8 can be removed, and a qui good joint 9 is achieved.
In Fig. 5 there is shown a solution whereby a scarf joint is used with a non-straight-lined joint 9. Hereby the joint 9 fol the fibres of the tree and the joint will be very natural and imperceptible .

Claims

Claims
1. A method of fixing a wooden sheet of veneer to a supporti lamina, c h a r a c t e r i z e d in that a moist, very thin, preferable 0,2-0,3 mm thick sheet of veneer (3) is placed on a pre-glued (2) surface of the supporting lamina (1), after whic they are glued together and dried by using hot-pressing so tha the humidity buffer which is achieved by the compression and t heat prevents the glue from penetrating up to the front surfac of the veneer (3).
2. A method according to claim 1, c h a r a c t e r i z e d in that the moisture content of the wooden sheet of veneer (3) equal or greater than that of a living tree.
3. A method according to claim 1 or 2, c h a r a c t e r ¬ i z e d in that the sheet of veneer is moistured to the saturation point before the step of glueing.
4. a method according to claim 2 or 3, c h a r a c t e r ¬ i z e d in that the moisturing step is carried out on a water cushion transporting device, which is transporting the veneer form the cutting station to the glueing statio .
5. A method according to any of the above claims, c h a r a t e r i z e d in that the supporting lamina (1) is made of pa plastic, fibreglass, woven, non-woven, plywood, hardboard, gyp board or wooden board.
6. A method according to any of the above claims, c h a r a t e r i z e d in that the step of hot-pressing the wooden she of veneer (3) onto the supporting lamina (1) is carried out wi a hermetically sealed planar press such that the water vapour does not evaporate from the surfaces during the step of hot- pressing.
PCT/FI1985/000069 1984-08-17 1985-08-16 A method of fixing a wooden sheet of veneer to a supporting lamina WO1986001142A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR8507230A BR8507230A (en) 1984-08-17 1985-08-16 PROCESS FOR ATTACHING A WOOD Plywood SHEET TO A SUPPORT BLADE
HU853632A HUT47475A (en) 1984-08-17 1985-08-16 Method for fastening cover plate made of wood
RO127057A RO105371B1 (en) 1984-08-17 1985-08-16 Fixing process of wood veneer sheets ou a suporting plate
DK166586A DK166586A (en) 1984-08-17 1986-04-11 PROCEDURE FOR DETERMINING A Veneer Sheet for a Bearing Layer
FI870646A FI870646A (en) 1984-08-17 1987-02-16 FOERFARANDE FOER ATT LIMMA FANER PAO EN STOEDFOLIE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI843270A FI843270A (en) 1984-08-17 1984-08-17 FOERFARANDE FOER INDUSTRIELLT UTNYTTJANDE AV TILL EN TJOCKLEK AV 0,2-0,3 MM SKURET TRAEFANER.
FI843270 1984-08-17

Publications (1)

Publication Number Publication Date
WO1986001142A1 true WO1986001142A1 (en) 1986-02-27

Family

ID=8519488

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1985/000069 WO1986001142A1 (en) 1984-08-17 1985-08-16 A method of fixing a wooden sheet of veneer to a supporting lamina

Country Status (15)

Country Link
EP (1) EP0224486A1 (en)
AU (1) AU4724785A (en)
BR (1) BR8507230A (en)
DD (1) DD238939A5 (en)
DK (1) DK166586A (en)
ES (1) ES8701013A1 (en)
FI (1) FI843270A (en)
HU (1) HUT47475A (en)
NO (1) NO861494L (en)
PL (1) PL255039A1 (en)
PT (1) PT80983B (en)
RO (1) RO105371B1 (en)
WO (1) WO1986001142A1 (en)
YU (1) YU132285A (en)
ZA (1) ZA856271B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072593A1 (en) * 2007-12-18 2009-06-24 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO A method for joining moist parts
WO2011076855A1 (en) * 2009-12-23 2011-06-30 Padana Ag Joined veneer strip

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB971592A (en) * 1961-02-08
GB200425A (en) * 1921-06-16 1923-07-12 Elmendorf Armin Improvement in the manufacture of veneered pulp and other boards and a process for making the same
DE510833C (en) * 1929-04-28 1930-11-03 Julius Carl Hofmann Method for applying a veneer made of vulcanized fiber u. Like. On wood u. Like. And the same for cleaning
GB356138A (en) * 1930-03-25 1931-08-25 Laucks I F Inc An improved process for uniting wood and other surfaces
GB697746A (en) * 1950-02-13 1953-09-30 Joshua Marshall Improvements relating to the manufacture of plywood
GB807090A (en) * 1954-05-31 1959-01-07 Friedrich Kuennemeyer Improvements in or relating to laminates of lignin-cellulose comprising a carrier and a synthetic resin cover
US3253970A (en) * 1962-01-31 1966-05-31 Hawley Products Co Molding, decorating and finishing die dried fibrous articles
CH441710A (en) * 1964-10-24 1967-08-15 Friz Gmbh Adolf Method for gluing veneer sheets
US3384137A (en) * 1963-07-08 1968-05-21 Monsanto Co Hot press plywood

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB200425A (en) * 1921-06-16 1923-07-12 Elmendorf Armin Improvement in the manufacture of veneered pulp and other boards and a process for making the same
DE510833C (en) * 1929-04-28 1930-11-03 Julius Carl Hofmann Method for applying a veneer made of vulcanized fiber u. Like. On wood u. Like. And the same for cleaning
GB356138A (en) * 1930-03-25 1931-08-25 Laucks I F Inc An improved process for uniting wood and other surfaces
GB697746A (en) * 1950-02-13 1953-09-30 Joshua Marshall Improvements relating to the manufacture of plywood
GB807090A (en) * 1954-05-31 1959-01-07 Friedrich Kuennemeyer Improvements in or relating to laminates of lignin-cellulose comprising a carrier and a synthetic resin cover
GB971592A (en) * 1961-02-08
US3253970A (en) * 1962-01-31 1966-05-31 Hawley Products Co Molding, decorating and finishing die dried fibrous articles
US3384137A (en) * 1963-07-08 1968-05-21 Monsanto Co Hot press plywood
CH441710A (en) * 1964-10-24 1967-08-15 Friz Gmbh Adolf Method for gluing veneer sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2072593A1 (en) * 2007-12-18 2009-06-24 Nederlandse Organisatie voor toegepast- natuurwetenschappelijk onderzoek TNO A method for joining moist parts
WO2009078714A1 (en) * 2007-12-18 2009-06-25 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno A method for joining moist parts
WO2011076855A1 (en) * 2009-12-23 2011-06-30 Padana Ag Joined veneer strip

Also Published As

Publication number Publication date
DK166586D0 (en) 1986-04-11
PT80983A (en) 1985-09-01
DD238939A5 (en) 1986-09-10
ZA856271B (en) 1986-04-30
ES546206A0 (en) 1986-11-16
NO861494L (en) 1986-04-16
ES8701013A1 (en) 1986-11-16
PL255039A1 (en) 1986-07-01
RO105371B1 (en) 1994-09-20
EP0224486A1 (en) 1987-06-10
DK166586A (en) 1986-04-11
FI843270A (en) 1986-02-18
PT80983B (en) 1986-12-09
FI843270A0 (en) 1984-08-17
HUT47475A (en) 1989-03-28
BR8507230A (en) 1987-08-04
YU132285A (en) 1988-04-30
AU4724785A (en) 1986-03-07

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