Note: Descriptions are shown in the official language in which they were submitted.
CA 02266651 1999-03-18
WO98112030 PCT~6100491
~ METHOD FOR MANUFACTURING WOODE~- BOARDS BY GLUEING
AND A BOARD
The innovation is directed to glued woodboard, which is specially thin and is formed
of c~ose together glued sawn timber battens. In addition the innovation is directed
to the production method of such solid glued woodboard.
Nowadays is known with different methods produced glued woodboards. One known
~n~tt,od is introduced in Finnish patent application Fl-794083. According to the inno-
vation glued woodboard is formed out of sawn timber, out of which at least a portion
is sawed lenghtwise of the sawn timber and formed pieces of sawn timber are jointed
together by glueing in to a woodboard. In the laying of the sawn timber pieces, they
are arranged so, that in ready made woodboard the living of the sawn timber causes
less possible reformation and cracks to the woodboard.
In the production of glued woodboard the width of the pieces of sawn timber is most
suitable a little bit bigger than the thickness of produced glued woodboard. One of
the weaknesses of this method is, that against each other glued pieces of sawn
timber wideness can vary, therefore the surface of glued woodboard is going to be
stepped. The measurernent of the steps can even be in the class of 3 mm. Out of
that follows, that glued woo~l~oard must be planned in order to get even surface. In
the application 794083 given description of the method means that it's very difficult
to produce thin glued solid woodboard. In practice with this method produced glued
woodboards thickness is at least Apr. 6 mm. All used known methods have
restricted the minimum thickness of the glued woodboard to 6 millimeters and themethods have needed a big quantity of wooden raw material compared to the
quantity of produced glued woodboard. Typically out of three cubic metres of sawn
timber raw material is needed in order to produce apr. one cubic meter ready made
thick glued woodboard.
With the new kind of product method of glued woodboard have suprisingly solved
the production of specially thin solid glued woodboard without a mentionable waste
of sawn timber raw material. Even that produced woodboard is thin, it consists of
next to each other glued sawn timber pieces, most suitable those are even thick
and even wide. For the invented solid glued woodboard and it's production methodis characteristic, what is presented in the patent application.
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CA 02266651 1999-03-18
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WO 98112030 PCT/F196~00491
With this invention is going to be reached noticeable advantages, becAuse new,
th~n glued so.id woodboards measurements can be for example widely used
600 mm X 2400 mm and thickness 2 mm - 6 mm. In it's production does not
greate mentionable amounts of waste wood raw material and this makes it
profitable coverplate to install both straight surfaces and curved surfaces, what
has not been possible with the previous glued woodboards. With the invented
sawing method can be succeed in the loose sawing of thin woodboard and kept it
equally thick through out the plate.
In the following explanation the innovation is introduced closer by pointing to the
attached drawing, where
Figure 1. presents glued sawn timber element, out of which woodboards are
going to be sawed loose with the invented method.
Figure 2. presents the sawing perfo mance.
Figure 3. presents the glued woodboard.
Glued sawn timber element 1. in figure 1. has produced out of several, widewi ;eequal, sawn timber boards or planks, as such known method. Boards 2. are put into
a stack, one on top of anotl ,er, when one against another boards sides 3. are glued
together. Produced glued woodboards 4. in order to expand the strength and
stralghtness, it's pro~ilable to notice ths woods grains 9. (figure 3.) directions, when
the b~ards or planks are stacked, should, when looking from the end of sawn timber,
grain directions should take turns between the sawn timber next to each other, most
likely in the 90 degrees turns.
The boards 2. are shaped right-angled by the cross section and planed from the
surfaces 3. to be glued. Dùring the glueing process glued sawn timber elemenl: 1. is
going to pressed against the sides 3. perpendicular direction with the powers F 1, F2.
Out of the element is sawed, after the glue has dried, glued woodboard plates 4.Ioose in the direction of the elements side surface.
According to the innovation, the sawing is going to be done along the lines 1, ll lll ....
and so forth, that way that always the blank is going to be sawed split from thecentre of the blank. In the start is going to be sawed line 1, as result got two pieces
are going to be sawed along the line ll and as the result got four pieces are going to
be sawed split along the lines lll and carry on until the final result is desired
woodboard thickness in all the pieces. With this sawing method the saw blade
is directed and stays well in the middle of the blank just in accurately follows tl1e
sawing line, bcc~l ~se thicker and also thinner blanks are opened always symmet-rically during the sawing.
CA 02266651 1999-03-18
WO 98112030 PCT/F'13G100131
To the saw blade ~. does not have any effect of any side directional forces, what
would bend the blade out of the element. The blade 5. will advance straight ahead
even in the thin element. If ths sawing would be done close to the other side of the
element t. for example out of the distance of 3 mm, the thin loosing plate wouldbend behind the blade 5. and the element would stay stiff. This would cause
unsymmetrical forces to the blacie.
In the figure 2. will show a suitable saw to the method, which blade 5. is a linear
blade. The blade does back and forth movement or it is a band saws blade, when
it worlcs with continues one directional movement. The saw cut 6. which is left
behind the blade stays, due to the symmetry, also in the centre of the sawing line.
Also, in the both sides of the blade 5. are the friction forces and circumstance the
sa~T e. The element 1. is going to be concentrated with respect to the blade forexample with the help of movable controls 7. As a controls are most suitable slide
rails or rohti"~ rolls.
The saw surface of the element can grind before loosing the following glued
woodboard, then the next loose sawed woodboard 4. does not have to grind, if
oniy the other surface of the woodboard must be grinned.
In figure 3. is ready made glued woodboard 4. which thickness d is in between
2 mm - 6 mm. By sawinci loosed woodboards wideness can go up to 60~ mm and
even one meter and length at ieast 2 - 2,4 metres. Board consists of sawn timberpieces, which are side by side 8. and are length wise same as the length of the
woodboard and which wideness is bigger than the thickness.
In most of the usage purposes of the woodboard, it is jointed with glue to the
desired surfaces, also to the curved surfaces, which outer surface is wanted
to be wood.
