Improvements in or relating to Wire Netting or Cloth for use in the Manufacture of Paper.
Year: 1897

page_text: Date of Application, 7th May, 1897-Accepted, 7th May, 1898
COMPLETE SPECIFICATION,
Improvements in or relating to Wire Netting or Cloth for use in the
Manufacture of Paper.
I, KARL KUFFERATH, of Mariaweiler, near Duren, in the Empire of Germany,
Manufacturer, 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 present invention relates to improvements in wire netting or cloth employed
in the manufacture of paper. The object of this invention is to make sieves or
cloths of this description more durable and thus to simplify the work with them
in paper-making machines. The accompanying drawings illustrate the form of
netting according to the present invention and as used hitherto side by side.
Figs. 1 to 4 show forms of wire netting used hitherto.
Figs. 5 and 5 show top and bottom views respectively of the fabric according
to the present invention.
The ordinary netting, for instance, that shown in Fig. 1 as used hitherto has
the great disadvantage of wearing out very quickly. The netting becomes worn
out chiefly on its lower surface owing to the friction on the rollers and strainers
of the paper making machine.
It has been attempted to prevent this quick wearing out by making the wire-
work with double warp threads as shown in Fig. 2 or even by making the latter
of wire cords as shown in Fig. 3, that is to say by employing cords consisting of
several wires twisted together. Such fabrics are, it is true, much stronger than
those in Fig. 1, in which the warp threads are single and make an equal bend at
the top and at the bottom; they have, however, the great drawback of producing
too strong a mark on the paper pulp, especially in the case of thin paper. The
same drawback is found with the so-called
Tryköper or Kyppert fabrics
shown in Fig. 4, in which the warp thread passes sometimes over two weft-threads.
This fabric also makes too strong a mark on fine paper.
6.
"
The present invention relates to a new fabric, the durability of which is con-
siderably increased and an impression or undesirably marked impression is avoided,
even in case of very fine paper. This new fabric is made in the manner shown
in Figs. 5 and 5º, Fig. 5 being a top view and Fig. 5° a bottom view of the fabric.
This fabric is made in such a manner that the lower surface shall be a strong
and the upper surface be a fine one. For this purpose the lower surface is made
somewhat like a Kyppert-fabric, as in Fig. 4, and the upper surface like the fabric
in Fig. 1, that is to say the warp thread only passes over one weft thread. In the
fabric according to the present invention the warp thread on the lower surface of
the netting passes over two weft-threads, while on the upper surface it is the same
as in the ordinary wire netting, i.e. only passes over one weft thread, and will not
therefore mark the paper. Owing to this construction there are on the lower
surface of the netting which as mentioned before, is subject to the greatest wear,
one third more warp-threads, whereby of course the durability of the lower surface
is correspondingly increased.

page_text: The main and novel feature of this fabric consists in the warp threads always
passing alternately over one weft thread and under two weft threads.
The durability in this construction can also be increased by using much thicker
wire for the warp-threads than hitherto. It was impossible hitherto to do so,
first, because the mark on the paper came out too strongly, and secondly, because
it was impossible to weave such a thick wire in the old manner. A feature of the
new fabric consists in the bends of the weft threads running diagonally, as shown
in the perspective views adjoining Figs. 5 & 5º.
Wire sieves as constructed hitherto and made of well-known fabrics shown in
Figs. 1 to 4 last on the average about 4 to 6 weeks; whilst netting according to the
present invention lasts 12 weeks or more.
renewal of netting is a very complicated
necessitating each time the stoppage of the
wire fabric are obvious.
Considering that the exchange or
operation taking a long time and
machinery, the advantages of the new
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is: :—
1. The manufacture of a wire-fabric for use in paper-making consisting in
causing the warp-threads to pass alternately over one and under two weft threads,
substantially as described.
2. A wire fabric for use in paper-making in which the warp threads pass
alternately over one and under two weft threads, substantially as described and
illustrated in the accompanying drawings.