Improvements in and connected with the Glueing or Cementing of Veneers.
Year: 1898

page_text: Date of Application. 4th May, 1898-Accepted, 18th June, 1898
COMPLETE SPECIFICATION.
Improvements in and connected with the Glueing or Cementing
of Veneers.
I, CHRISTIAN WILHELM LUTHER, of Reval, Russia, Manufacturer of Wooden
Articles, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement
The invention has for its purpose the waterproof association of veneers with a
glue such as is described in British Patent No. 21774, dated 1st October 1896. I have
described therein the association of veneers by means of this cement on the cold
gluing process. However this may also be done with the same cement by means of
hot platens and has in this form advantages over the other system.
There are two processes for having the glued veneers between hot platens.
1. The veneers are coated with the cement and then dried. When the cement is
dry the veneers are laid on each other, three or more, with their fibres crossing
and then placed between hot platens and pressed together.
Under the influence of the heat the cement becomes sticky again and the veneers
are firmly associated. The heat also has the influence on the albumen to make
this so far insoluble that it even does not swell any more in water.
After the veneers are removed from the press they may be used at once.
2. The veneers are coated with the cement and not dried but with the cement
wet are piled on each other, three or more, with their fibres crossing and then placed
between the hot platens and subjected to pressure.
The water contained in the cement is formed into steam and partly evaporates
through the sides of the veneers; the greatest part is however taken up by the
wood of the veneer, which was dry before the cement was put on to it. Thus after
about 5 minutes pressure and the veneers taken out they are found to be firmly
associated to each other, the cement having almost entirely become dry, the wood
having been moistened through the steam getting into it and as the veneers leave
the press very hot the moisture evaporates very quickly and the veneers are dry
again in a short time.
In this process the heat also makes the cement so far insoluble that it even does not
swell any more in water.
This method is the most perfect as it does not require the drying of the veneers,
after they have been coated with the cement, which is a complicated costly and
troublesome operation, and it gives finally the same result, as here too the particles of
albumen that have not been made insoluble by the lime will get so through, the
heat, besides the veneers are almost ready for use when leaving the press as they
require very little time to dry.
The hot gluing process altogether is more perfect than the cold process and
ensures a better association of the veneers.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. Associating veneers with a waterproof cement such as is claimed in British

page_text: Patent 21774 of 1896 by means of coating this cement on to the veneers, letting it
dry on the veneers, then piling these. veneers, three or more, upon one another, and
finally subjecting them to pressure between hot platens, as set forth.
2. Associating veneers with a waterproof cement such as is claimed in British
Patent 21774 of 1896 by means of coating this cement on to the veneers and piling
them, three or more, upon one another and while in a wet state subjecting them to
pressure between hot platens directly after the cement has been laid on to the
veneers previous to drying same, as described.
5333 D
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said C. W. Luther.