Year: 1888

page_text: Date of Application, 13th Jan., 1338
Specification Accepted, 17th Feb., 1888
I, HEINRICH HOEBORN of Heincz Westphalia Germany Engineer 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 :-
--
This invention relates to improvements in paper making machines whereby one
and the same machine is enabled to manufacture paper of all kinds of materials of
any desired thickness, varying from the thickest cardboard to the thinnest tissue
paper.
I will describe my improvements with reference to the accompanying drawing,
which shews a side elevation of so much of a paper making machine as is necessary
to explain my invention, namely the part between the coucher and the first drying
cylinder.
The coucher and the entire sieve apparatus is driven by a felt, forming the upper
cloth.
Motion is imparted to this cloth from the cylinder G which constitutes the upper
cylinder of the wet press, and by this motion a uniform speed of the entire sieve
apparatus is effected. The principal advantage of the use of such an upper cloth
consists however in that the leading of the paper sheet from the coucher, which is
otherwise necessary, is obviated, as the sheet passing off from the sieve A, and which
has passed through the coucher adheres momentarily to the upper cloth. All previous
constructions with a similar arrangement were subject to the great disadvantage that
on passing from the coucher and wet press the paper sheets separated from the upper
cloth, and the paper becoming shifted was consequently either torn or creased in the
wet press, in particular when making light tissue papers.
My invention consists in preventing the paper sheet from becoming detached from
the cloth, and in pressing out any air bubbles that may form so that the paper always
arrives perfectly smooth under the wet press, whereby no creasing or tearing thereof
is possible even with the thinnest material. The coucher BC is for this purpose
carefully adjusted and between this and the wet press G J there are two guide
rollers EF so arranged that the sheet coming from the coucher rises and passes over
the roller E at an obtuse angle to the wet press.
Over the rollers E and F also passes the under cloth passing over the rollers DE
FL MONP which heretofore served for leading the paper to the wet press. By

page_text: the adjustment of the front guide roller D of this cloth, the paper adhering to the
upper cloth will also be carried by the undercloth as soon as it leaves the coucher,
and as it passes in an obtuse angle over the roller E it is pressed firmly between the
two cloths. Air bubbles are by this means removed without danger, and any shifting
of the paper in its further travel is prevented. The paper being led in this manner
under the wet press the action of the latter upon the former is the most favorable
possible and the paper now only carried by the upper cloth, led over guide roller W
to the drying cylinder H from which it is led away over roller V.
This first drying cylinder is also still driven from the cylinder G or the upper cloth,
and it is provided with an adjusting screw U for accurate adjustment worked by
worm and worm wheel gear K. The upper cloth is led back to the coucher cylinder B
over the guide rollers Q R S T.
As to the capabilities of this improved machine, it may be stated that it can produce
with perfect safety tissue paper of 16 grammes to the square metre, while the best
known machines of this class, with smaller producing power, can only make such
paper of the minimum weight of 24 grammes without the guarantee for the perfect
condition of the produce such as is afforded by the present improvement.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
In paper making machines in which the whole of the sieve mechanism and the
first drying cylinder are driven by an upper cloth receiving motion from the upper
cylinder of the wet press, the arrangement of the said mechanism in such manner
that the upper cloth passing from the coucher together with the paper adhering
thereto, is led upwards and over a guide roller E over which the under cloth also
passes and which is so arranged in the framing that the two cloths with the paper
between them are led over the same, and also over a second guide roller F to the wet
press at an obtuse angle, substantially as and for the purposes herein set forth.
Dated this 13th day of January 1888.
ABEL & IMRAY,
Agents for the Applicant.