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Патент USA US2112597

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Patented Mar. 29, 1938
Ernest Lee Griggs, Jr., Waynesboro, Va... assignor
to E. I. du/Pont de Nemours & Company, Wil
mington/Del” a corporation of Delaware
No Drawing. Application July 21, 1937,
. Serial No. 154,835
'3 Claims. (01117-21)
pirn package is secured. When the operators,
by visual gauging, judge the pirn packages to be
This invention relates to a process of making
shipping packages of arti?cial yarn having char
acteristically a low knot count, and particularly
relates to a process of making shipping packages
' of the desired weight, the spindle position is
. of arti?cial yarn having characteristically a low
knot count and a uniform yardage. In the fol
lowing speci?cation and claims, the term “knot"
or its equivalent, unless otherwise stated, is meant
to include only those knots arising from package
,10 transference of the yarn during various textile
stopped and the pirn packageis do?ed and re
placed with an empty pirn. Twistingof the yarn
remaining on the supply package on to the/‘empty
pirn is immediately started and the process is re
peated; a sufficient number of additional spin- .
ning packages being tied in to yield the requi
site size of ‘pirn package. For convenience, this '10
system is described as staggered supply and stag
Generally speaking, the preparation of a cellu
lose acetate yarn shipping Pa ckage is achieved
in three textile operations consisting of spinning,
15 twisting, and coning.
In the spinning step, generally a ?lamentous
yarn is dry spun in a spinning cell and wound on
gered do?ing.
In the throwing step, the twisted yarn from the
pirn package is transferred by a winding opera
tion on to a. lightweight core, such as a paper'15
cone or metallic spool.
Proceeding in the above-described fashion, one
obtains surprisingly frequently in the shipping,
_a bobbin immediately afterv issuance from the package produced by the three operations more
cell. In attempting to obtain a spinning package knots andmorevarlations in yardage than would N) 0
of a given size, the thread is wound on the col
naturally be expected. The presence of knots in
lecting means for a given perio d of time, sched
the yarn is a distinct disadvantage in that the
uled according to the particular yarn,
knots interfere with the needles and frequently
spinning speed chosen. At the end of this sched
cause stoppage and expensive delays in weaving,
uled period, the operators pro ceed along the spin- ' knitting, and like textile operations. The varia
25 ning cells and windup positions composing the tion in yarn yardage is a source of trouble in that
‘ spinning machine, and each position is do?ed by the yarn packages exhaust unevenly and before
substitution of an empty bobbin for the com
the completion of the textile operation.
pleted spinning package. In making spinning
_ One object of the present invention, therefore,
‘1 packages in this fashion, I have now observed,
is to furnish shipping packages containing a 30
30 particularly at high spinning speeds of 300 yards minimum of knots.
or more per minute, that the yardage in spin
ning packages containing the same denier yarn
varies considerably from packa ge to package even
though spun on the same or
different spinning
Another object of the invention is, to furnish
for a given yarn denier shipping packages con
taining substantially the same yarn yardage.
Another object of the invention is to wind con- 35
iation arises in large - sistently at the spinning machine yarn packages
35 machines. This yardage var
part, from such factors and sources as the do?ing ‘containing substantially the same yardage of I
skill of the individual operators, ‘the spinning ' a given denier sized or unsized yarn.
speeds of the individual spinning machines, slight
Another object of the invention is to employ
departures from the scheduled doi?ng time, etc.
40 This dif?culty of yardage variation in spinning
packages of the same denier yarn has never been
satisfactorily overcome until my present inven
In the twisting step, generally the yarn from
45 spinning packages containing from it» to 1%
pounds of cellulose acetate yarn is given the de
sired degree of twist on a downtwister, and is
wound on a pirn or like carrier to form a pirn
_ 50
package containing approximately 11/2 pounds of
Generally, the operators patrol
twisted yarn.
back and forth along the length vof several down
twister machines composed of a plurality of spin
dlepositions and, as the yarn from a supply spin
w ning package
runs out, new supply spinning -
‘55 packages are tied in until the desired size of
on downtwister machines-supply spinning pack- 40
ages containing 2 or .more pounds of yarn.
Another objectof the invention is 'to form on
downtwister machines pirn packages of knotless , '
twisted yarn.
Speci?cally, the object of the invention is to 45
form, during three manufacturing steps, a ship
ping'package of twisted cellulose acetate yarn .
containing not more‘than one knot.
More speci?cally,‘ theobject of the invention
is to‘furnish a process wherein the above objec- 50
tives are accomplished.
According to my invention, a shipping package
of cellulose‘acetate yarn'containing not more
than one knot is produced, in three manufactur-_
ing operations, bya process comprising contin- 55
uously spinning and winding a predetermined
yardage of at least substantially 25,000 yards of
ning package, and a predetermined yardage of
yarn is twistedon to the pirns in the same fashion
knotless yarn vupon a suitable spinning carrier, as in the case of the ?rst set of pirns. By operat
down-twisting the yarn from the said unit spin
ing in this fashion, the supply spinning packages
ning carrier to produce therefrom at least one‘ run out substantially evenly along the entire ma
pirn package containing a substantially prede _ chine while forming sets of unit pirn packages
termined yarn yardage and winding or throwing wherein the individual packages of the set con
the yarn from at least two of the said unit pirn tain substantially the same yardage. . Thus,
- packages upon a lightweight support to form the
said shipping package.
In the preferred embodiment of the invention,
' the spinning, twisting, and throwing operations
are conducted in the following manner:
In the spinning operation, a meter or other
yardage-measuring device is connected to the
face drive roll, on which rests the yarn-collecting
means of the spinning machine, or, in the case of
cap spinning, to the drive roll preceding the cap
spinner. In turn, this yardage meter is connected
20 to a clock counter graduated in such a fashion as
to designate when each position of the spinning
machine should be dofl'ed. The clock counter and
unit supply spinning packages having substantial
ly the same yardage. Likewise, for convenience,
the doi?ng of the entire downtwister niachine in
the above fashion is designated as "flat do?ing”
and the term “unit package” is used to denote the
package containing a, predetermined yardage of
twisted yarn. It will, of course, be obvious that
a knotless package is obtained by the use of a
?at supply and the ?at do?lng of a unit package.
In the coning operation, i. e., in the winding of
- meter device is so set that 25,000—900,000 yards of
continuous ?lamentous yarn are spun and
25 wound before the clock counter begins to move,
the exact yardage setting depending on the yarn
denier being spun. The yarn is collected, prefer
ably, ona sleeve bobbin. When the meter indi
cates that the predetermined requisite yarn yard
30 age hascollected'on the sleeve bobbin at the ?rst
the yarn into the ?nal, shipping package, the
twisted yarn from two or more of the previously
prepared unit pirn packages is transferred to a
paper cone or similar‘ lightweight core to form
the desired sized shipping package containing a
position of the spinning machine, the hand of the
clock counter moves to the No. 1 position on the
weight of yarn which is an even multiple of the
weight of yarn in the pirn package.
By operating in the above preferred manner,
the number of knots arising from package trans—
graduated scale, and the operator do?s the com
pleted spinning package and starts the continu
35 ously spun yarn winding on an empty bobbin
fer in the ?nal shipping package depends entirely 35
sleeve. Thereafter, at de?nite time intervals, the
on the number of unit pirn packages going into
the same. For example, in making a \3-pound
cone package from two 1% pound pirn packages
there will be only one knot in the ?nal package
from package transference during the three steps 40
of spinning, twisting, and throwing. That is to
say, the number of knots will be one less than the
number of unit pirn packages going into the
counter hand moves progressively to Nos. 2, 3, 4,
5,-6, 7, 8, etc. positions on the scale, and the
operator in sequence therewith doifs spinning po
40 sitions Nos. 2, 3, 4, 5, 6,- '7, 8, etc. and simul
taneously starts the formation of spinning pack
ages on empty bobbin sleeves. In like manner, the
. entire spinning machine is .doil’ed and the yarn
allowed to collect once more into spinning pack
shipping packages.
45 ages until the meter again indicates that the ?rst
While the above represents the preferred proc
es of the invention, it will be obvious to those
skilled in the art that various modi?cations may
spinning position is to be dofl'ed. By operating
in this fashion, there is formed a completed spin
ning package containing 2, 3, or more pounds of
knotless yarn and having a yardage variation of
be made withoutdeparture from the principles
taught by the invention.
50 as little as 1-2% based on the total yardage of
the package.
speci?cally, if one employs a 3-pound spinning
package supply, one may form in this fashion two
1 V2 pound pirn packages of substantially the same
yardage for the same given denier yarn. For con
venience, the term “?at supply" is used to denote
the above practice of equipping a plurality of
spindle positions of a downtwister machine with
The number of yards of yarn wound on the
spinning package should at least be 22,000 yards
and preferably should be 45,000 to 900,000 yards
In the twisting operation, a 2, 3, or more pounds
unit spinning package is twisted on a down
twister machine to form two or more unit v,pirn
or more,
Naturally, the number of yards in a
spinning package of given weight varies with the
55 packages containing knotless yarn, and each
denier of the yarn being spun. In spinning a low 65
denier yarn, more yards are wound on the spin
pim having substantially the same yardage for a
given denier yarn.
ning package than in spinning a heavy denier
A yardage-measuring device, such as a‘meter, is
yarn. Thus, in spinning a 30 denier yarn, prefer
connected on the downtwister machine to the ably 223,000 to 893,000 yards of yarn are wound
60 drive roll feeding the yarn to the ring traveler and into a spinning package, whereas in spinning a 300
pim. when the predetermined requisite yardage v denier yarn 22,000 to 90,000 yards are wound into
.is collected on the pirn as indicated on the meter,
a spinning package. In all cases, however, pro
the ?rst spindle position is shut down, the pim ‘ceeding according to the process of the inven
package is withdrawn, and an empty pirn is sub
65 stituted. After shutting down the ?rst spindle
position, at de?nite time intervals of approxi
mately one minute successive spindle positions are
shut down until approximately 25% of the spindle
positions of the spinning machine arestopped,
70 when the entire machine is shut down. The pim
packages on the remaining positions are then
doifed and replaced with empty pirns.
After resetting the meter yardage-measuring
device, the downtwister machine is started, the
75 empty pirns tied tov their individual supply spin
tion, spinning packages of a given denier yarn are '
consistently secured which are substantially equal
to the yarn yardage desired in‘ the completed spin
ning package.
In the twisting operation, it is preferred to
equip the entire downtwister machine with a "?at
supply" unit of supply spinning packages con 70
taining individually substantially the same yarn‘
Of course, different downtwister ma
chines are equipped with the above-mentioned
knotless supply spinning packages containing at
least 22,300 yards and preferably 45,000 to 76
Theputstanding advantage of the invention is
893,000 yards of yarn, provided supply spinning
packages of the same yardage are employed on that it gives in its preferred form a shipping
package containing at the most only one knot
each downtwister machine. At least two pirn during
three textile operations and having sub
packages of twisted yarn are made from each stantially
the same yardage for a given denier
supply spinning package, and in no case is more
than one supply spinning package used in making yarn. However, the invention also has the ad
of eliminating to a large extent burden
two pirn packages of twisted yarn. (Preferably, vantage
some bookkeeping as to the times at which nu
one supply spinning package is measured oil‘ in
the downtwisting operation to form two to four merous spinning and twisting machines should 10
doiled, since such is substantially automati
unit pirn packages of twisted knotless yarn. The be
cally taken care of by the process of the inven
pirn packages of twisted knotless yarn contain tion.
The process of the invention also o?ers
from 22,300 to M1000 yards of continuous yarn, the advantage of automatically pacing the oper
according to the particular denier being spun. ators in dof?ng various positions at the spinning
In ?at do?ing on a downtwisting machine, cer
15 tain minor deviations may be made without los
ing the advantages of the invention. Thus, in
starting the twisting operation, the yarn ends
of the supply packages may all be tied to the
empty pirns and all the spindle positions of the
20 downtwister started simultaneously; From an
operating standpoint, however, this is less ad
vantageous and, since the speed of the twisting
machine is relatively slow and there is relatively
little time lag between the starting of the ?rst
25 ‘spindle position and the end spindle position by
the operator, the error in yarn yardage is rela
tively small.
machine. The process also eliminates any var
iation in‘ yardage arising from miscellaneous
factors such as di?erence in drive'roll speeds,
etc. In the twisting operation, the simultaneous
completion and removal of supply spinning pack
ages on an entire downtwister machine is of great 20
assistance to the operator. Moreover, in using
the ?at do?ng'system on ‘the downtwisters, all
the spindle positions are down at one time and
free of yarn so that the machine may be thor
oughly cleaned, if desired, without contaminat
ing and lowering the quality of the yarn. In
addition, it is possible to spin large packages on
It is important in the downtwisting operation . the spinning machine, and to twist into pirn
that a flat supply and ?at do?ing system be used packages which contain an even fraction, e. g.,
1/2, $41, 1/3, etc.‘of the yardage contained in the .
in order that unit packages are obtained and in spun package, thus permitting the use of pirns
order that the beginning of a supply spinning v
small to enable accurate control of
package coincides with the beginning of the su?iciently
twisting, elimination of mechanical di?iculties,
formation of the pirn package and‘the end of the low initial expense and low maintenance costs.
supply package coincides with (the end of the
Any modi?cation of the invention which con
formation of the same or a different pirn pack
to the spirit thereof, is intended to be
age. The result is a unit pirn package contain- ,
ing at least 22,300 yards of knotless twisted yarn. included within the scope of the claims.
I claim:
.. ..
In the throwing step,'it is preferred that the
1. In a process for the production of improved,
shipping package be made from .two unit-pirn arti?cial yarn wound packages, the steps which 40
packages 01 knotless twisted yarn.v The ?nal comprise spinning from a liquid thread-forming
package, accordingly, will contain preferably at medium, a number 01.’ spun'packages of thread
least 45,000 to 893,000 yards or more of twisted containing substantially the same denier and
'yarn containing only one knot.
_yardage, twisting said packages into twisted
While ‘the above invention is described‘ for
packages which contain substantially 45
convenience in terms of cellulose acetate yarn; "thread
equal yardage but which is a fraction of the
it will be obvious that the process may "advan
yardage of said spun packages, then winding said ~
tageously be applied in the manufacture of ship
thread packages into a number of ?nal
ping packages of any continuously dry spun yarn twisted
thread packages of substantially equal yardage,
comprised of an organic derivative of cellulose. the yardage in said ?nal packages being substan 50
Thus, instead of cellulose acetate, the yarn may tially an even multiple of the yardage in said
be comprised of organic esters of cellulose such
thread packages.
as cellulose acetopropionate, cellulose acetobue twisted
2. The process as de?ned‘in claim 1, charac
tyrate, cellulose acetostearate, or cellulose pro
terized in that the yarn is cellulose ester yarn.
.pionate, or of cellulose ethers such as ethyl or
3. The process as de?ned in claim 1, charac 55
1 benzyl cellulose. ' It may also be applied to arti
terized in that the yarn is cellulose acetate yarn.
?cial _yarn made from viscose or from cupram
monium cellulose, particularly when made by
the bobbin process, or to other types of arti?cial
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