Improvements in the Manufacture of Pasteboard Articles.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Pasteboard Articles.
I, NEWNHAM BROWNE, of 73, Cheapside, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of this invention, which
invention has been communicated to me from abroad by Teodor Remus, of Dresden,
in the Empire of Germany, 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 a new process for preparing pasteboard at the
places where it is required to be bent in such a manner that the bending shall not
cause any injury to the outer surface of the pasteboard.
This process is particularly applicable in cases where the bending is such as to
produce not a sharp but a rounded corner and in the manipulation of pasteboard
whose surface forming the exterior of the finished article is, by reason of its colour
for example, of such a nature as to be especially sensitive to injury.
The process consists in the following:
On the inner side of the pasteboard at right angles to the corner or line of
bending there are formed cuts, or incisions, a, at equal distances apart and to a
depth of about three quarters of the thickness of the pasteboard. These cuts are
either continuous as represented in Figures 1 and 2 of the annexed drawings, or
form interrupted lines as in Figs. 3 and 4, or again as represented in Figs. 5 and 6
they may consist of rows of pricks or punctures.
That part of the thickness of the pasteboard affected by these cuts is thus divided
into strips, in these strips on the other hand a displacement of the particles in
consequence of the compressing or crowding action takes place and consequently a
loosening of the connection between them occurs. The two combine to produce a
weakening of the resistance which these parts or layers oppose to the bending and
to the crushing action resulting from such bending, whilst the uncut parts retain
their power of resistance.
The cuts a also have the effect of producing a displacement of the neutral plane
towards the uncut outer side so that this plane coincides or nearly so with the base
or bottom of the cuts a.
In consequence of this the pasteboard material on the outer side is subjected to
so much less stretching, or straining, that it is not liable to be torn or cracked by
the bending whilst the inner parts or layers subjected to compression in the bending
process offer a moderate resistance only for the reasons above set forth.
In working with certain kinds of pasteboards, such for example as those with a
very intimate combination of the fibres, the process consists, in addition to the
treatment above described, in wetting the parts in the vicinity of the cuts a with a
cementing liquid, this being performed simultaneously with the production of the
said cuts.
By the action of the liquid the displacement of the particles which occurs in
the crushing action and the crowding action itself is facilitated, whilst the
cementing matter remaining after the liquid has evaporated not only restores the
loosened connection between the fibres and the original solidity or firmness of
the pasteboard but also imparts greater stiffness to the bent part.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :
In the manufacture of pasteboard articles a process for the preparation of the
part to be subjected to bending consisting in making cuts, or incisions, a, at right

page_text: angles to the line of bending, which cuts, or incisions, form continuous lines (Figs. 1
and 2) or interrupted lines (Figs. 3 and 4) or lines of punctures (Figs. 5 and 6)
and, if required, moistening with a cementing liquid the inner side of the pasteboard
in the vicinity of the cuts a, simultaneously with the formation of the latter.
Dated this Fichth day of January 1801
NEWNHAM BROWNE.