Improvements in the Manufacture of Hollow or Surface Coated. Filaments.
Year: 1899

page_text: Date of Application, 20th June, 1899
Complete Specification Left, 20th Mar., 1900-Accepted, 21st Apr., 1900
PROVISIONAL SPECIFICATION.
. Improvements in the Manufacture of Hollow or Surface Coated.
Filaments.
I, REGINALD HADDAN, of the Firm of Herbert Haddan & Co., of 18, Bucking-
ham Street, Strand, W.C., London, Patent Agent, do hereby declare the nature
of this invention a communication to me from abroad by Dr. Johann Stark, of
Arcisstrasse 59, Private Tutor, the Bayerische Glühlampen Fabrik G.m.b.H. of
Landsbergerstrasse 79, Erwin Moritz Reiniger, of Landsbergerstrasse 79, Manager,
and Georg Lüdecke, of Landsbergerstrasse 67, Foreman, all of the City of Munich,
Empire of Germany, to be as follows:
-
Hollow filaments such as are used for incandescent electric lamps, and in
certain instances also solid filaments which have a coating of some other sub-
stances, have several advantages over ordinary solid filaments or uncoated fila-
ments, particularly in having greater strength and resistance with a thickness
varying very little from that of the ordinary filament. Such filaments also as are
made for other purposes, for example artificial silk can also be made hollow or
in the nature of a coating or some other internal substance as a core in the
same way and by the same process.
Filaments made according to this invention are produced by the known method
of allowing a fluid or semi-fluid material to pass out of a fine orifice either into the
free air or into some hardening fluid, but by this invention they are not passed
through a circular orifice; but through an annular orifice surrounding an orifice
concentric with it through which latter orifice there at the same time issues either a
fluid of a preparatory or other nature, or some substance intended to form the core
if a core is required.
Such fluid issuing with the material of the filament or coating through an
orifice independently fed and separate from, though enclosed by the orifice
through which the material for the filament or coating issues, enables the latter
to be made tubular with or without a filling core.
Dated this 20th low of Ima 1000
Improvements in the Manufacture of Hollow or Surface Coated
Filaments.
I, REGINALD HADDAN, of the Firm of Herbert Haddan & Co., of 18, Bucking-
ham Street, Strand, W.C., London, Patent Agent, do hereby declare the nature
of this invention, a communication to me from abroad by Dr. Johann Stark, of
Arcisstrasse 59, Private Tutor, the Bayerische Glühlampen Fabrik G.m.b.H. of
Landsbergerstrasse 79, Erwin Moritz Reiniger, of Landsbergerstrasse 79, Manager,
and Georg Lüdecke, of Landsbergerstrasse 67, Foreman, all of the City of Munich,
ID

page_text: 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:-
Hollow filaments such as are used for incandescent electric lamps and in
certain instances also solid filaments which have a coating of some other sub-
stances have several advantages over ordinary solid or uncoated fila-
ments particularly in having greater strength and resistance with a thickness
varying very little from that of ordinary filament..
.
. I.
The present invention relates to a process of manufacturing such filaments and
also artificial silk.
་་།
In the annexed drawing. Fig. 1 represents a section of the apparatus used for
the purpose. Fig. 2 shows the same apparatus on a still further enlarged scale,
in order to show the manner in which the threads are formed.'
In principle the method of producing the filaments is the same as that known
and employed principally for manufacturing artificial silk, according to which,
dissolved cellulose, for instance, is allowed to pass under pressure out of a fine
orifice either into the free air or into some hardening fluid. The method and
process, however, by which hollow filaments or filaments with a core of some
other substance are produced are as follows:-
Into a hole or vessel a, which becomes narrower at the bottom a second tube or
vessel b, likewise narrowing at the bottom, is concentrically fixed in such a
manner, that both have a common orifice. This orifice is therefore double, con-
sisting of an annular opening and of a circular opening contained within, and
concentric to, the former. The said annular and circular openings are divided by
a thin partition connected with the inner vessel. A feed pipe ends at in the
outer vessel or tube a, and a tube b¹ feeds the inner vessel or tube b.
Through the said tube a¹ some substance suitable for producing filament, such
as, for instance, dissolved cellulose, is forced, and simultaneously therewith, but
independently therefrom, a fluid of a preparatory or other nature or a second
suitable substance is pressed, so that the inner substance or the preparatory
fluid will be introduced concentrically into the outer substance and pass out of
the orifice, lying evenly together, into a hardening fluid (see Fig. 2) or into the
atmosphere.
In this manner a hollow filament or a filament with. a core is produced. The
nature of the filament or the substances of which it is made depends, of course
upon the purpose for which it is intended. If it is to be used as an incandescent
body the substances must be suitable for incandescent purposes. For artificial
silk the substances must, of course., be different.
F
It should further, be mentioned that the orifices for the substance forming the
filament can be of other than circular shape, according to the shape it is desired
that the product should have.
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. The method of producing hollow artificial filaments or artificial filaments
having a core from dissolved cellulose and the like in which the substance form-
ing the filament and a fluid suitable for preparing the filament or for filling the
hollow space within the. latter, are forced through tubes with concentric common
orifices.
2. The apparatus for the process described in Claim 1 consisting of two tubes a
and b with orifices arranged concentrically to each other, through which tubes
the substances forming the filament are caused to pass and are pressed through
the common orifice of said two tubes.
· Dated this 19th day of March 1900.