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Патент USA US2136462

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Nov. 15, 1938.
’ >
2,136,462
R. PICARD ET'AL
METHOD OF MAKING TUBULAR ARTIFICIAL TEXTILE THREADS
Filed May 21, 1935 4
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Patented Nov. 15, 1938
2,136,462
UNITED STATES PATENT OFFICE
2,136,462
METHOD OF MAKING TUBULAR ARTIFICIAL
TEXTILE THREADS
René Picard, Lyon, and René Fays, Villeurbanne,
France, assignors to Societe Alsa in Basle, a
corporation of Switzerland
‘
Application May 21, 1935, Serial No. 22,517
In France May 211, 1934
8 Claims.
This invention relates to hollow or tubular ar
ti?cial textile threads and more particularly to a
process of producing the same.
United States Patent No. 1,394,270 describes
5 inter alia a process for the manufacture of arti
centimeters, and the path in air is at least 150
centimeters to ensure almost complete ?xation.
The bath travel contemplated by this invention
super?cially ?xes the thread and substantially
complete ?xation is secured during the air travel.
Furthermore, it has been found advantageous to
dispense with thread-guiding members in the
?cial textiles containing gas bubbles from cellu
losic or other solutions containing gases emulsi
?ed therein. This process for the manufacture
of porous textiles has been the subject of numer
ous improvements successively described in the
bath or any device which impedes the free travel
United States Patents Nos. 1,427,330, 1,464,048,
thread by stretching before the winding thereof
1,487,807, 1,544,631, 1,652,206and 1,831,030, and
such as, for example, stretching the thread at
same stage between the bath and delivery roll or
British Patent 255,527, and their principal result
has been the production of more or less swollen
tubular ?bers. In section, the said ?bers have
the appearance shown in Figure l of the accom
panying drawing, and in longitudinal elevation
20
(01. 18-54)
of the thread, leaving only those devices which
are intended to increase the tenacity‘ of the
beyond the latter.
Microscopic observation of arti?cial viscose silks 15
having tubular ?bers thus obtained with a short
path in the spinning bath shows that by this
they appear in the form of striated laminae (Fig—'
means a much more uniform width of the ?bers
ure 2.)
is also obtained.
In accordance with the principles of this in
vention, a viscose solution of the type ‘used in
the manufacture of hollow ?laments is spun into
an appropriate spinning bath. The extruded
thread is then given a bath travel which is in
It sometimes happens, however, that in the
longitudinal elevation there are to be seen pro
nounced transverse striations which, under mi
croscopic examination, appear in the form of
partitions dividing the tube into sections, hence
25 the name “partitioned” given to this defect (Fig
ure 3).
United States Patent No. 1,544,631 and British
Patent 255,527 have indicated certain conditions
for the preparation of the spinning solution and
30 the spinning bath, which enable this defect to
be eliminated to a very large extent. When in
spite of this it exists in part, the more accentu
ated the defect is, the more the thread is weak
ened.
35
The object of the present invention therefore
is the total elimination of this defect and the
production of arti?cial thread, the ?laments of
which are tubular.
One of the well-known procedures for increas
40 ing the tensile strength of arti?cial thread pro
duced from viscose consists in giving the thread
a long travel such as, for example, up to 2.50 me
ters in the spinning bath. When such a pro
cedure is applied to the spinning of an arti?cial
is en viscose silk having tubular ?bers, a partitioned
and considerably weakened thread is produced.
We have now found that in spinning viscose
under the conditions indicated in British speci
?cation No. 255,527 the tenacity of the thread is
increased, when the length of travel in the spin
ning bath is such as to be insu?icient to com
pletely ?x the thread, and thereafter conducting
the thread in air whereby it is substantially com
pletely ?xed. Speci?cally, the bath travel is
55 made as short as possible, that is, less than 25
su?icient to completely ?x the thread. Speci?
cally, the thread is given a bath travel whereby
the thread is super?cially ?xed. More specifi
cally, the thread is given a bath travel of not
exceeding and preferably less than 25 centime
rs. After withdrawal from the spinning bath,
the thread is given a travel in the air of not less
than 150 centimeters to ensure substantially com
plete ?xation before engaging the delivery roller.
The thread is then Wound up in any suitable man
ner as in a centrifugal spinning bucket.
'
It is to be noted that during the bath travel
it is of advantage if the thread does not engage
with any devices which impede the free travel
of the thread. If the thread is to be stretched,
this is preferably eiTected by suitable devices im 410
posing the desired tension on the thread between
the spinning bath and the delivery roll or beyond
the latter.
By way of an illustrative example given merely
to indicate the results which the process renders
it possible to obtain, a viscose containing 7.3%
of cellulose and 4% of caustic soda has been in
creased to the alkalinity of 7% by the addition of
sodium carbonate, and then ripened 73 hours at
13° C. The viscose was then spun in a bath,
containing per liter 145 grams of sulphuric acid,
228 grams of sodium sulphate and 2.5 grams of
zinc sulphate, in one case with a travel of .50
centimeters in the said bath, in the other case
with a travel of 22 centimetrs. In both cases 55
2
2,136,462
the thread on leaving the bath travels 16G cen
timeters in the air before arriving at the delivery
roller, which delivers it at the speed of 60 meters
into a centrifugal pot revolving at 5,000 revolu
tions per minute.
The results were as follows:
_
10
Tenacity gms. per
Extension on breaking,
denier
percent
Path cm. (in
thread to travel for a distance of not over 25 cen
bath)
Dry thread Wet thread Drythread Wet thread
50 ______________ __
22 ______________ __
stretching the thread at some stage between the
bath and wind-up device, and ?nally winding up
the thread.
4. In a process of making arti?cial thread
formed of unitary ?bers, each of said ?bers being
substantially tubular throughout substantially the
entire length thereof, the steps which comprise
spinning a viscose solution capable of producing
hollow ?laments in a spinning bath, causing the
l. 5
1. 6
0. 65
0. 80
20
21
21
25
15
In the ?rst case 50% of the ?bers are partitioned.
In the second case, all the ?bers are provided with
a continuous central tube.
British Patent No. 255,527 has speci?ed the lim
20 its of concentration in which the spinning bath
should be maintained in order to produce threads
with tubular ?bers. The central part of the
ranges thus drawn represents the optimum con
dition. As one departs from the optimum condi
tion, partitioning appears and becomes more and
more frequent. This central part is considerably
broadened by spinning with a short path in the
bath according to the present invention, which
con?rms the importance it possesses for the man
V30 ufacture of an arti?cial viscose silk having tubu
10
timeters in the spinning bath, said thread being
caused to travel through said bath without en
gaging any device which impedes the movement
of said thread, then causing the thread to travel
in the air for a distance of at least 150 centime
ters, stretching the thread at some stage between
the bath and wind-up device, and ?nally winding
up the thread.
5. In a process of making arti?cial thread
formed of unitary ?bers, each of said ?bers be
20
ing substantially tubular throughout substantial
ly the entire length thereof, the steps which com
prise spinningaviscose solutioncapable of produc
ing hollow ?laments in a spinning bath, causing
the thread to travel for a distance of 22 centi
meters in the spinning bath, and then causing
the thread to travel in the air for a distance of
160 centimeters.
6. In a process of making arti?cial thread
formed of unitary ?bers, each of said ?bers be
ing substantially tubular throughout substantial
lar threads.
Since it is obvious that various changes and ly the entire length thereof, the steps which com
prise spinning a viscose solution capable of pro
modi?cations may be made in the above descrip
tion Without departing from the nature and spirit ducing hollow ?laments in a spinning bath, caus
35 thereof, this invention is not restricted thereto ing the thread to travel for a distance of 22 centi
meters in the spinning bath, said thread being
except as de?ned in the appended claims.
caused to travel through said bath without en~
We claim:
1. In a process of making arti?cial thread ‘gaging any device which impedes the movement
formed of unitary ?bers, each of said ?bers being of said thread, and then causing the thread to
substantially tubular throughout substantially travel in the air for a distance of 160 centimeters.
'7. In a process of making arti?cial thread
the entire length thereof, the steps which com
formed of unitary ?bers, each of said ?bers being
prise spinning a viscose solution capable of pro
substantially tubular throughout substantially
ducing hollow ?laments in a spinning bath, caus
the entire length thereof, the steps which com
ing the thread to travel for a distance of not over
prise spinning a viscose solution capable of pro- ~~ ;
25 centimeters in the spinning bath to incom
pletely ?x the thread, and then causing the thread ducing hollow thread in a spinning bath, causing
to travel in the air for a distance of at least 150 the ?bers to travel in said bath without engaging
centimeters to substantially completely fix the any device which impedes the movement of the
thread and for a distance sufficient to super?cial
thread.
2. In a process of making arti?cial thread. ly ?x the ?bers, said distance being not in excess 1,
formed of unitary ?bers, each of said ?bers. being of 25 centimeters, withdrawing the ?bers from
substantially tubular throughout substantially the bath, and causing the ?bers to travel in air
for a distance su?icient to permit substantially
the entire length thereof, the steps which com
complete ?xation thereof.
prise spinning a viscose solution capable of pro
8. In a process of making arti?cial thread,
in ducing hollow ?laments in a spinning bath, caus
ing the thread to travel for a distance of not over formed of unitary ?bers, each of said ?bers being
25 centimeters in the spinning bath, said thread substantially tubular throughout substantially
being caused to travel through said bath without the entire length thereof, the steps which com
engaging any device which impedes the movement prise spinning a viscose solution capable of pro
ducing hollow thread in a spinning bath contain
'60 of said thread, and then causing the thread to
ing 145 grams of sulphuric acid per liter of bath,
travel in the air for a distance of at least 150 cen
228 grams of sodium sulphate per liter of bath
timeters.
and 2.5 grams of zinc sulphate per liter of bath,
3. In a process of making arti?cial thread
formed of unitary ?bers, each of said ?bers being causing the ?bers to travel in said bath for a dis
substantially tubular throughout substantially the tance of 22 centimeters and Without engaging any
entire length thereof, the steps which comprise device which impedes the movement of the
spinning a viscose solution capable of producing thread, withdrawing the ?bers from the bath,
hollow filaments in a spinning bath, causing the causing the ?bers to travel in air for a distance of
160 centimeters, and delivering said thread at a
thread to travel for a distance of not over 25
centimeters in the spinning bath to incompletely speed of 60 meters per minute to a collection de 70
U
l
?x the thread, then causing the thread to travel
in the air for a distance of at least 150 centime
ters to substantially completely ?x the thread,
V108.
RENE’ PICARD.
RENE’ FAYS.
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