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Патент USA US2107758

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Feb. 8, 1938.
E. KNECHTEL
2,107,758
PROCESS FOR AVOIDING THE OVERCHARGING OF DRIVES FOR RAYON CENTRIFUGES
Filed March 4, 1931
'10
WW3
, Patented Feb. 8, 1938
2,107,758
STAT-ES ‘PATENT '1 OFFICE
2,107,758
PROCESS FOR AVOIDING THE OVERCHARG
ING OF DRIVES FOR RAYON CENTRIFUGES
'
Erich Knechtel, Sydowsaue, near Stettin, Ger
many, assignor to North American Rayon Cor
poration, a. corporation of Delaware
Application March 4, 1931, Serial No. 520,162
In Germany March 10, 1930
5 Claims.
7
' g , In the manufacture of rayon, especially viscose
,
rayon, according to the so-called centrifuge or
(01. 18—54)
chamber of a spinning centrifuge illustrating the
use of my invention.
spinning pot process, where spinning baths are
used containing sulphuric acid and salts and
5 Zjunder certain conditions also organic matters,
certain di?iculties have arisen when the spinning
Fig. 2 is a plan view of a plurality of spinning
chambers illustrating the use of my invention
with the covers of said chambers removed.
In the drawing in which like numerals of refer
pots are run at a great number of revolutions. ence indicate like parts, I represents the vertical
This is particularly the case if the spindle speed ' walls of the spinning chambers and 2 indicates
exceeds 5,000, for instance at from 7,000 to 12,000 the bottom partition.
10' revolutions per minute,where it has been found
The partition 2 has an opening 3 through which 10
that in a continuous. operation during which, ‘in
the course of several hours, the spinning pot is
the spinning spindle 4 projects. The spinning pot
gradually ?lled with fresh rayon, the'necessary
driving forces increase in an incomprehensible
cover 6 having an opening 1 for the insertion of a
15 manner which, especially in the case of electric
,motors, may cause ‘ dangerous over-loadings.
’ It has been found that this increase and addi
tional load during such a spinning period is
hardly caused-by an increased friction of the
gears, or by the larger amount of rayon in the
spinning pot. A more thorough investigation
5 is supported and rotated by the spindle 4. A
thread guide tube (not shown) is illustrated in
Figure 1.
15
In order to eliminate the formation of the
aforementioned salt crusts with consequent dan
ger of overloading the rotating means, the pots
are sprayed during rotation with liquid which is
brought through the spinning chamber by means H
of a supply pipe 8. Branch pipes 9 having nozzles
shows that with this large number of revolutions
in are supported on the supply pipe 8 and are
as required by the high spinning speed, and more
positioned in such a manner as to send a fan
so with the manufacture of a strong warpv twist,
shaped spray tangentially against the side of the
spinning pot. This eliminates the formation of 25
crystals with the resultant danger to the spinning
crystals are caused by ‘the evaporation of spin
ning bath solutions out of the spinning pot. The
evaporation is accelerated by the great surface
‘speed of the pot in the surrounding atmosphere.
Further tests have shown that these salt crusts
make the surface of the pot uneven and thus
cause a larger amount'of friction in the air,
which again causes theabove over-load.
According to the present invention the for
mation of these salt crusts is eliminated, or the
35 ‘deposits are continuously or intermittently re
7 moved.
This may be done in different ways.
operation.
'
From the foregoing description taken in con
nection with the accompanying drawing, it is be
lieved that the operation and advantages of my 30
invention will be apparent. to those skilled in the
art.
Having now fully set forth my invention as
required by the patent statutes, what I desire to
claim is:
35
1. In the method of collecting wet spun ?la
ments in a driven spinning pot, the step of sub
mitting the outer surface of the pot to a spray
Thus, the spinning pots can be sprayed con
tinuously or intermittently with liquids, such as
warm water, during the working time. This water , of liquid in a direction tangential to the said sur
' 40, is able to dissolve the salt crusts immediately face and in the direction of rotation thereof while 40
. > after they begin to form.
~
the centrifuge is in operation.
Another method of procedure is to maintain
2. In the method of collecting spun ?laments
' such atmospheric conditions in the spinning pot in a driven spinning pot, the step of submitting
chambers as will not allow the formation of salt the outer surface of the pot to a fan-shaped spray
' 45 crusts, e. g. by maintaining an especially high air of liquid in a direction tangential to the said sur 45
humidity, or by introducing wet vapor into the face and in the direction of rotation thereof while
spinning pot chambers.
the centrifuge is in operation.
; Another form of this process is to spray warm
water of 30-40° C. by means of a nozzlev in a. fan
in a driven spinning pot, the step of submitting
50 like form in tangential direction on the outer
mantle of the centrifuge pot in the direction of I
its rotation.
'
I
In the drawing accompanying this application,
55' - Figure 1 is a cross sectional view through the
3. In the method of collecting spun ?laments
the outer surface of the pot to a periodic spray 50
of liquid in a direction tangential to the said sur
face and in the direction of rotation thereof while
the centrifuge is in operation.
4. In the method of collecting spun ?laments
in a driven spinning pot, the step of submitting 55
2
‘
'
2,107,758
the outer surface of the pot to a spray of liquid
maintained at a temperature between about 30°
and 40° C. in a direction tangential to the said
surface and in the direction of rotation thereof
while the centrifuge is in operation.
5. In the method of collecting spun ?laments
in a driven spinning pot, the step of submitting
the outer surface of the pot to a spray of liquid
in a direction tangential to the said surface and.
in the direction of rotation thereof while the
centrifuge is in operation the said vspray being
discontinued during a part of the operation of the 5
centrifuge.
‘
1
‘
ERICH KNECII-ITEL.
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