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Патент USA US2129274

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Sept. 6, 1938.
Filed June 14, 1934 _,
' 2 Sheets-Sheet 1
Sept. .6, 1938.
Filed June 14, 1934
2 Sheets-Sheet 2
Patented Sept.v 6, ‘1938
August Hartman and Johannes Uy'tenbogaart,
Berlin-Lichterfelde, Germany, assignors to
North American Rayon Corporation, a'corpo
ration of Delaware
In June
14, 1934,
June serial
No. 730,662
_6 Claims.
The invention comprises a processand appa
ratus for wet treatment and drying of arti?cial
?laments ‘or threads in the continuous process
for the manufacture of ‘arti?cial silk.
There are already known methods according
to which freshly spun arti?cial silk ?laments
which‘ must undergo a wet treatmentv and a
directly following drying, are led inspirals over
guiding cylinders whereby they are treated with
the necessary liquids for the purpose of de-acidi
fying, bleaching, softening, washing, etc. Such
guiding cylinders have often been given the form
of reels, and the spiral movement of the ?laments
over these guiding devices was achieved either
18 through appropriate movements of the individual
laths of such a reel, or by means of guiding hooks
or intermediate guiding rolls, etc. Finally it has
been suggested that groups of cylinders be used
in guiding the ?laments, which groups ‘should
20 be made up of two or morgcylinders, slightly
sloped toward’each other, and inv this manner to
accomplish the spiral movement of the ?lament.
It has also already been suggested to treat the
freshly spun arti?cial silk ?lamenton one and
25 the same cylinder, in a ?rst zone with ?uids and“
in a‘second zone on the cylinder to allow a stream
of dry air to play on the cylinder, and to take
effect on the ?laments. Others have preferred
to lead the ?laments which'are to be dried over
30 separate drying cylinders or through air drying
It is an object of this invention to provide an
improved process and ‘apparatus for the after
.treatment of arti?cial silk ?laments, whereby the
35 aftertreatment and drying of the filaments, while
they are
It is a
40 to, carry
being passed in spirals over a rotating
‘or ‘a pair of rotating cylinders, are
in the smallest possible space.
further object of the .present invention
out the wet treatment of freshly spun
arti?cial ?laments or threads in a continuous
process while passing them in spirals over a ro-,
tating guiding device and to dry the ?laments or
threads on a directly following zone of the guid
45 ing device whereby the ‘necessary‘heat for the
drying of the ?laments is transferred from the
cylinder to the ?laments.
I It is another object of the "invention to trans
fer the heat necessary for the drying of the ?la
50 ments-to the guiding device, or to a part thereof,
by‘ causing a highly heated medium to take effect
directly upon such portions of the surface of the
guiding device with which the windings of the
?laments are not, at the moment of application
of the heat, in contact.
(Cl. 18-8)
A still further object of the invention is a
device for the wet treatment, and the imme
diately following drying, in a continuous process
of ?laments or threads which are led in spirals,
whereby one or more‘ rotating cylinders are pro-’
vided as guiding and transporting means, these
cylinders having, at least in the drying zone, full
and fairly smooth outer surfaces, and whereby
in the neighborhood of these surfaces a device
is located which is adapted to transferring heat
to those portions of the surfaces with which‘ the
?laments are ‘not momentarily in contact.
' These and other objects of the present inven- '
tion will ‘become more apparent from a study of
the following description and by'reference to the 15
attached drawings in which:
Fig. 1 shows a device for wet treatment and
drying of arti?cial ?laments in side elevation in
partial ‘section;
' I
, Fig. 2 shows‘ a section of the device according
to, Fig. 1 in the direction of the line 2—-2;'
Fig. 3 shows a similar section vof a different
construction of the device;
Fig. 4 shows the device of which Fig. 3 is a sec
tion, in side elevation.
Fig. 5 shows a side elevation of a further con
Fig‘. 6 is a vpartial section of the side elevation
of a fourth construction-form.
The present invention is based on the use of 30
a guiding cylinder or a group of guiding cylin
ders, preferably of ,cylinders with a full smooth
surface, at least in so far as the drying zone is
concerned. Both operations, wet treatment and
drying, are achieved on one and the same cylin 35
der or rotating device or, if desirable, one and
the same group of cylinders.
; The wet treatment in any appropriate form is .
carried out on a ?rst part of the guiding cylinder
or group of guiding cylinders, i. e. by means of 40
sprinkling; ‘In spirally passing over the rotat
ing device the thread reaches the drying zone
and it is an important feature of the invention
that in the drying zone a highly heated'medium
is applied directly to that partwof the cylinder or 45
the cylinders, with which the arti?cial silk wind
ings are not, at the moment of application, in
contact, or with which they do not come in con
tact at all. The highly heated medium therefor
comes directly in contact with the cylinder-walls,
but as opposed to the common air-drying does
not come directly in contact with the. arti?cial
Especially a highly temperatured heating gas
of a burning device may beused as heating me
dium, which maybe brought .to play directly on‘ Y which is to be heated and for a short space con
the cylinder walls. The highly heated medium, form with the surface of the cylinder, while the
i. e. highly temperatured burning gas may be rest of the burner may be prevented from giv
applied from within the guiding cylinder, as well ing off heat rays by a suitable insulation. _
The single cylinders of a guiding cylinder-pair
as from the outside. In the ?rst case it is most
purposeful to construct the cylinder or cylinders which are at an angle to‘ one another, maybe
‘at least in the drying zone, out of a' ?reproof, built alike;rthey may have more or less a 'con
stant diameter and may be built along the whole _
heat conducting material, such as nickel or
Monel-metal or V2A=steel or similar special steels.
length out cf the same material. The heat which
?ows from the heated zone to the wet treatment 10
10 In those cases in which the cylinder or cylinders
are heated from the outside it‘ is preferable to
- use ?reproof materials for the cylinders, which
zone may be used in heating the washing water
and the like. That part of the cylinder which is
are at the same time poor heat conductors, and
it-has been found that in these cases clay 'or
especially porcelain pipes or rollers are very suit
to be used in wet treatment processes may how
ever also be made out of a different material than
able, which pipes in unglazed porous form \may
be easily turned, and which are highly resistant
to the temperature and temperature differences,
used in this process and are not cut by the’ cellu
'lose ?laments.
that in the-drying zone, without giving up the 15
symmetrical form of the cylinder, or this part oi’
the rotating cylinder may be given a dif?erent‘
construction. It is not important that they single
cylinders form a geometrically ideal cylinder.
For-special purposes it may also be provided that 20
According to a very practical construction form
two nearly parallel cylinders may be used, the
the flow of heat from the drying zone to the
wet treatment, zone may be hindered, and for
axes of which however form a slight angle with
one another so that the arti?cial silk thread, dur
insulating discs, insulating rings, etc., consisting
ing the rotation of the cylinders is passed in 'a
for example of mica or the like, between the two.
manner known per se in spirals over these cyl
inders. The wet treatments are achieved, i. e. by
sections of the rotating cylinder.
such purposes it has been found practical to put’
/ .
- The invention makes it possible to simplify'
-~sprinkling, on the ?rst part of .these cylinders. ‘the apparatus and process in the continuous
The other part of the cylinder pair. is used as a ' method of ‘manufacturing arti?cial silk in a sur
30 drying zone. There, the highly heated medium is . prising manner, and to concentrate it in a small
applied directly to the cylinder walls, however
The possibility of the use of a high tem--v -
only on such portions where the highly heated
peratured heating medium, especially in the form '
medium cannot come in direct contact with the
of high temperatured burning gases on the cyl
arti?cial silk windings, either because the .silk
inder surfaces in such a manner that the delicate
arti?cial silk threads do not come in direct con 36
35 windings do not pass over the portions at all,
or at least do not come in contact with these
tact with the burning gases, makes it possible to
portions at the moment of application of the
dry the arti?cial silk economically in a continual
heat. It is sufficient, that one cylinder of the pair,
process, and to overcome the previous di?iculties
in this respect. In particular in those cases where
the arti?cial silk thread is alternately lead away 40
namely the onewhich is to be heated, is made out 40 of ?reproof material which is either a good or
poor' heatconductor. Both cylinders, however,
maybe out of. ?reproof material at least in the
from the drying cylinder and back to it again,
the thread undergoes a treatment which might
drying zone, and if desired, both may be heated.
In case- the cylinders are to be heated in the
'45 drying zone from within, it is recommended that
they be constructed out of ?reproof materials
which are good conductors of heat, such as nickel,
“Monel-metal”, “V2A-steel”, etc.; while if it is
to be heated from the outside it is preferable,
.50 according to experiments, to use ?reproof ma
be called an ironing eifect, which makes the twist
ing and sizing unnecessary for many uses of
terials which are poor conductors of heat.
The heating of the cylinders in the drying zone.
from the outside may be accomplished by ‘locat
ing the heating medium, 1. e. burning gas, in the
arti?cial silk, because thereby the capillary ?la 45
ments are pressed‘ together to form an integral
threadshaft. In the further treating of arti?cial
silk, especially in washing, dyeing, etc., the neces
sary opening of the~thread again takes place.
Different construction forms which are to be 50
used in the sense of the invention, of suitable de
vices are explained with reference to the draw
ings below.
The device for the treatment of artificial silk
according to Figs. 1 and 2 is constructed of two 65
55 form of illuminating gas, water gas, generator
gas, in the space between the two cylinders, near ' driven treating cylinders i and 2, to which the
one or the other of the two cylinder surfaces
with which the arti?cial silk does not come in
contact in passing over the cylinders. In this
60 way it is possible toapply the heat, for example,
thread is guided from a spinning device which is
not shown in the drawings. The thread is guided
on these cylinders in spiral windings, which is
achieved by the arrangement of the cylinders at
of high temperatured burning gases economically
an angle to one another. The cylinders are cut
directly on the zone of the cylinder which is free
of thread windings, and this heat is given up to
the arti?cial silk windings during the continual
65 rotation of the cylinders. This heating can, e. g.,
~\ be accomplished by locating gas burners with
many smallr?ames in a line along the surface,
very close to the free zone of the cylinders in the
off from the rest of the machine by a plate I I at
the lower end in order to protect the machine
drying zone.
Instead of the common appropriate constant
gas burners such devices may be used as are
known in the technic of ?ameless burning of ii
luminating and power gases. Such burners can'
be given a purposeful form, in that their effective
75 surfaces are directed toward the rotating surface
from splashing water. Besides that, the water
dripping off from the cylinder is led off by this 65
plate. The treatingliquid is applied to the cyl-v
inder out of the spray tubes 3, 4. The liquid
forms a thin layer around the portions of the
cylinder lying below the spray tubes and ?ows'
in accordance with the inclination of the cylin 70
der in the opposite direction to the progression
of the thread. The upper end of the cylinder is
constructed as a drying zone and is heated from
the under side by a gas burner 5. The cylinder
is practically constructed out of porous porcelain. 75
A shield 1 is located at both sides of the gas burner
to prevent the gas ?ame from being deviated
which a highly heated medium has been applied
at a point with which the threads are momen
from time to time by air streams. 'The gas flame
vcan beregulated by the regulating screw 8 with
tarily out of contact.
a valve.
arti?cial silk comprising, in combination, a pair
of spaced rollers, means for driving said rollers,
According to the construction form of Figs. 3
and 4 a surface burner is used insteadof a gas ‘
burner, it consisting of a heating plate 8 and
a covering 9. In this case one is not forced to
10 locate the heating device on the underside of
the cylinder, as is necessary in the case of a gas
burner, but the surface burner may be located
over the lower cylinder or in any desirable posi
tion. In thisway the upper cylinder as well as
the lower cylinder may be heated and the two
heating devices may be connected by a connect
ing pipe I0, and in this case only one gas pipe
is needed. The liquid is led to the upper cylin
der l6 as well as to the lower cylinder I],
20 through the pipes l3, ll, l5 and 28.
In Fig. 5 a device is shown in which only one
treating cylinder
I8 is provided which is
sprinkled with liquid through pipes I9, 20, and
which is heated at its upper front end by the
The left part is made out of
glass; the right part out of porcelain. Between
25 heating device II.
both parts is an insulation zone 21 which may
consist of a narrow air layer or an intermediate
layer of mica or asbestos, etc.
2.;A device for use in the manufacture of
said rollers disposed at a slight angle one to the
other whereby a thread looped around said roll
ers will be conveyed from one end to the other,
means for spraying with treating liquid one por 10
tion of said rollers, and heating means positioned
between said rollers for heating a portion of at
least one of the rollers.
3. A device for use in the manufacture of
arti?cial silk comprising, in combination, a pair
of spaced rotating rollers positioned at an angle
one to the other whereby when thread is looped
around'said rollers the said thread will be passed _
from one end thereof to the other end, means
for spraying with treating liquid one portion of 20
said rollers, and means positioned between saidv
rollers adapted to heat the surface of one of said
rollers at a point with which the ?laments are
not for the moment in contact.
4. A device for use in the manufacture of 25
arti?cial silk comprising, in combination, spaced
rotating rollers over which thread alternately
passes in- an approximately spiral path, means
to spray treating liquid over one portion of said
In order that the thread pass in regular spiral rollers and the thread passing thereover, and 30
windings over the cylinder I! from the wet treat
means to heat a portion of the outside of at least
ment zone .to the drying zone a free running or one of said rollers, with which, at the moment
driven roller 2| is provided whose axes forms an of applying heat, the threads are not in contact.
angle with the axes of the roller ll. The guid
5. Ina-process for the continuous manufac
ing roller may be replaced by guiding hooks or ture of arti?cial ?laments, the steps of passing 35
by a row of little guiding rollers, etc.
the ?laments in a helical path over smooth sur
Fig. 6 shows still another device, in which the faced rotating guiding surfaces, wet-treating the
heat is applied to the drying zone 23, of the cylin
?laments in successive stages as they pass pro
der 2!, from within by the heating device 24. In gressively over at least one of said surfaces, and
40 this case the treating-cylinder or at least its dry
drying the ?laments in successive stages by pass 40
ing zone must consist, preferably, out of a sub
ing them alternately a_ plurality of times over
stance which is a good heat conductor. In this a heated portion of at least one of said surfaces
construction the thread is guided in a spiral and an unheated portion of-said surfaces, the
path by the free running little guiding rollers 25.
What we claim is:
1. In a process for the continuous manufacture
of arti?cial ?laments the steps of passing the
heated portion having applied a highly heated
medium at a point with which the threads are 45
momentarily out of contact.
6. In a process for the manufacture of arti?
?laments in a helical path over smooth surfaced
cial ?laments. the steps comprising passing
rotating guiding surfaces, wet-treating the ?la
freshly extruded wet ?laments alternately over
heated and unheated surfaces a plurality of
times whereby air-ironing effect of the ?laments
50 ments in successive stages as they pass progres
sively overat least one of said surfaces, and dry
ing the filaments in successive stages by passing
is achieved.
them alternately a plurality of times over a
heated portion of at least one of said surfaces
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