close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Jan. 7,
APPARATUS Eon
v. R.
couvzmme rraw TO TOP
Filed July 31. 194:5
42
40'
IE
Patented Jan. 7, 1947
2,413,969
UNITED STATES. PATENT OFFICE
2,413,969
APPARATUS FOR coma'rmd; I '
'row TO TOP
;
'
Vernal R. Hardy; Wilmington, L'DeL, assignor to
E. 1. _du Pont de Nemours 8; Company, Wil
mington, Del.,' a corporation of Delaware
Application July 31, 1943, Serial No. 496,848
5. Claims. (01. 19-1)
1
2
This invention relates to a process and appa
carried out. Other objects of the invention will
ratus for drawing and breaking a tow oi’ continu_
be apparent from the description that follows.
ous ?laments to form a top. More particularly.
The objects of this invention are, in general,
the invention relates to the conversion of a tow
accomplished by subj ecting the yarn to a stretch
of cold-drawable continuous ?laments, such as a 5 break system wherein the drawing rolls are of
tow of nylon ?laments, into a spinnable top with
such construction or are so positioned relative
out destroying the continuity of they tow and sli- _
to the retaining rolls as to simultaneously apply
ver and the substantial parallelism of the ?bers.
varying amounts of stretch to the continuous ?la
Herein, the expression “tow” is intended to
ments at di?erent positions transversely in the
cover a bundle of continuous ?laments in sub 10 tow between the retaining and drawing rolls prior
stantially parallel relationship. Also herein, the
expression "sliver” is intended to cover the struc
ture formed when the continuous ?laments of the
tow are severed into ?bers of predetermined
lengths. Also herein, the expression "top” is in
tended to cover the product resulting from draw
ing the sliver.
’
to breaking said ?laments.
‘
In order to more fully explain the invention.
reference will be made to the accompanying
drawing forming a part of this speci?cation and
15 wherein:
Figure 1 is a side elevation of a drawing frame
illustrating the arrangement of the retaining and
drawing rolls;
In the conversion of a continuous ?lament tow
to a spinnable top, the fibers formed must be dis
Figure 2 is a plan view of the retaining and
. tributed so that there is substantial overlapping 20 drawing rolls shown in Figure 1;
of ends if yarn of acceptable physical properties
is to be produced. Up to the present; no satis
factory arrangement has been advanced to e?ect
suitable overlapping or staggered relationship of
Figure 3 is a side elevation showing a modi?ed
arrangement of the retaining and drawing rolls;
Figure 4 is a plan view of the retaining and
drawing rolls shown in Figure 3;
'
?ber ends in a stretch-breaking system. Fur 25
Figure 5 is a side elevation showing a still fur
thermore, in the conversion of tow to top by the
ther modi?ed form of arrangement of the re~
breaking method, the ?bers produced may be
tainingand drawing rolls;
,.
varied in length and in physical characteristics
Figure 6 is a plan view of the retaining and
by varying the reach, i. e. the distance between
drawing rolls shown in Figure 5;
'
the bites of the retaining and drawing rolls, and 30
Figure 7 is a side elevation of still another mod
the relative peripheral speeds of the retaining and
i?ed arrangement of the retaining and drawing
drawing rolls. However, for any setting or ad
justment of the drafting frame now in existence,
there are certain limitations in range of ?ber
lengths and varying physical characteristics that 35
cannot be exceeded.
,
'
rolls;
-
'
Figure 8 is a plan view of the retaining and
drawing rolls shown in Figure 7;
Figure 9 is an enlarged plan view of one form of
?ber which is produced; and
Nylon‘ and other cold-drawable ?bers have
Figure 10 is an enlarged modi?ed form of ?ber.
varying a?lnity for dyestu?’s‘, depending upon the
Referring now to the drawing wherein like ref
vdegree to which the ?bers have been drawn. (See
erence numerals designate like parts, the refer
Lewis U. S. Patent No. 2,278,888.) For certain 40 ence numeral 2 designates a plurality of ends of
purposes this is considered desirable. In the
tow supplied from any suitable source (not
case of a spun yarn prepared from ?bers having
shown) and which pass through a converging
different dye characteristics, a pleasing variegat
guide 4 in their passage to the stretch-break sys
ed colored appearance or better color “depth” is
45 tem. The stretch-break system, as shown in Fig
obtained.
.
ures 1 and 2, comprises a drawing frame in which
An object of this invention is to provide an im
the retaining rolls comprise, in the form shown in
proved and novel method of converting continu-v
Figure 2, a driven roll 8 and a heavy or weighted
ous ?lament tow to top with better ?ber distri
?oating roll 8 cooperating therewith, and the
bution. A further object of this invention is to
provide a method of variously drawing cold-draw 50 drawing rolls comprise a driven roll I0 and a
heavy or weighted ?oating roll l2 cooperating
able ?lamentous material and breaking the same
to produce staple-length ?bers, each of which has
therewith. The rolls 6 and III are driven in the
non-uniform characteristics. Another object of
usual manner (not shown) so that the peripheral
this invention is to provide a novel arrangement
speed of the drawing rolls l0 and I 2 is higher
of drafting rolls to enable this new process to be 55 than the peripheral speed of the retaining rolls
2,413,969
6 and 8, whereby the desired stretching, breaking
rolls may be made irusto-conical. Such an ar
rangement is shown in Figures 7 and 8, wherein
the retaining rolls comprise a driven roll 58 and
and drafting may be obtained.
As is shown in the embodiment illustrated in
Figures 1 and 2, the retaining rolls 8 and 8 are
mounted at right angles to the direction of travel
of the tow, while the drawing rolls HI and I! are
mounted in angular relation thereto so that the
distance between the bite of the two sets of rolls
on one end may be as much as several times the
difference between the bite of the two sets of
rolls at the converging end. In other words, the
reach between the retaining and drawing rolls
varies in length from end to end. In view of the
difference in the reach from one side of the web
of ?laments to the other, varying amounts of
stretch are applied and some of the ?laments will
be broken, with a relatively short part of the ?la
ments being undrawn while other ?laments will
have longer undrawn portions or partially un
a heavy, weighted or ?oating roll 52, and the
drawing rolls comprise a frusto-conical driven
roll 54 and a heavy, weighted or ?oating frusto
conical roll 58. The axis of rotation of the rolls
54 and 56 may be only slightly canted with respect
to the axis of rotation of the retaining rolls or
may even be parallel thereto. By this arrange
ment, not only is the reach different for the many
different ?laments constituting the tow, but the
peripheral speed of the ?ber-contact surface on
the drawing rolls is made variable (depending on
15 the taper of the roll) and thus greatly alters the
amount and distribution of the stretch to the
?laments. In this embodiment, it Will'be neces
sary to have the ?laments subjected to a mini_
mum draft su?iciently great to insure breakage.
drawn portions passed through the rolls before 20
In each of the preceding embodiments, by vary
they are actually broken. The sliver resulting
ing the relative speeds of rotation of the retaining
from the breaking operation is also drafted by the
and drawing rolls or by intermittently stopping
rolls to produce a top.
the retaining rolls, the non-uniformities of ?ber
From the drawing rolls l8 and I2, the top
lengths and denier may be further accentuated.
passes through a condenser or trumpet ll, either 25 If desired, the tow may be comprised of ?laments
of the stationary or rotary type, wherein the top
of varying denier or a number of tows, two or
is laterally compressed or condensed, particular
more of which have different deniers, and may
be fed into this drawing frame to produce a great
ly to remove the feather edge obtained in the pre
ceding drafting operation. The laterally com
variety of ?ber deniers in the sliver or top and
pressed top, after leaving the trumpet, passes be 30 in the spun yarn produced therefrom. When
tween a driven roll l6 and a pressure roll I8 con
the ?laments comprising the tow are of nylon or
stituting condensing or compacting rolls which
condense and compact the top passing there
through. The condensing rolls l8 and I8 also
other cold-drawable material, they may be en
tirely undrawn, partially drawn or fully drawn,
or the tow may be made up of any combination
serve to deliver the top to a suitable collection 35 of such ?laments. If desired, the continuous ?la
device.
ment bundles or tows may be subjected to a pre
Instead of having the retaining rolls at right
weakening treatment, such as by partial fusion,
angles to the direction of travel of the tow there
partial solution or by any other suitable means
between, such retaining rolls may be positioned
at intermittently spaced points prior to the draft
at an angle to the path of travel of the tow pass 40 ing and breaking steps of this invention.
When undrawn nylon or other cold-drawable
ing therebetween, and the drawing rolls may be
material comprises the ?laments of the tow to be
positioned at right angles or at an angle to the
direction of travel-of the tow. ,The latter ar
stretch-broken by means of this invention, the
staple-length ?bers produced are characterized
rangement is shown in Figures 3 and 4 wherein
the retaining rolls comprise a driven roll 38 and 45 in general by the shape depicted in Figure 9.
a heavy or weighted roll 32, said retaining rolls
Starting from the lead end of the ?ber, there is
being positioned in angular relationship relative
a section of minimum diameter which is fully
drawn, designated by the reference numeral 60.
to the tow passing therebetween. In this embodi
ment, as shown in Figures 3 and 4, the drawing
This section may be extremely short or fairly
rolls, which comprise a driven roll 34 and a heavy, 60 long, depending on whether the break occurred
weighted or ?oating roll 36, are also positioned in
near the back roll or at some other location be
angular relationship with respect to the path of
tween the two sets of rolls. Next, there will be
a tapered section, designated 62, which at one end
travel of the material passing therebetween. As
may be substantially entirely undrawn and of the
shown in Figures 3 and 4, the bite between the
retaining and drawing rolls gradually decreases 55 maximum diameter and, at the other end, sub
from position to position in the direction of the
stantially completely drawn and of minimum di
converging ends.
ameter and therebetween all degrees of drawing
In place of having one set of drawing rolls,
from undrawn to substantially drawn. This
two sets of drawing rolls may be utilized. In such
portion is thus formed because, when the lead
an embodiment, which is shown in Figures 5 and 60 end of the ?ber is broken, the portion that has
6, the retaining rolls, which comprise a driven
not yet passed through the nip of the back rolls
roll 40 and a weighted or heavy ?oating roll 42,
is undrawn and cannot be subjected to drawing
are positioned at right angles to the path of the
until the lead and of the ?lament reaches the nip
tow passing therebetween. As previously men
of the front roll. If the drawn portion of the lead
tioned, there are two sets of drawing rolls, each 65 end of the ?lament is very short, then the un
set containing a driven roll 44 and a heavy,
drawn section that follows will be caught by the
weighted or ?oating roll 36. The two sets of
drawing rolls are mounted so that the minimum
nip of the front roll before any substantial draw
ing can take place. A little further along, how
and maximum reach between the retaining roll
ever, more drawingtakes place until, at the time
and each of the drawing rolls are substantially 70 of breaking, all of the following ?lament which
the same. In order to direct the web of ?laments
exists between the bites of the two sets of rolls, and
into two substantially equal portions and divert it
designated 64, will be substantially'fully drawn
through the respective set of drawing rolls, there
and of minimum diameter. In fact, there will be
is provided a stationary member 48.
an in?nite number of shapes, and the relative
In place of using cylindrical rolls, the drawing
portions of these three sections constituting the
75
5
?ber will vary greatly, depending on the loca
tion or the lead end and the following end or the
?ber when the breahoccurs. The two ends or the
8
f
.
.rayon or other cellulosic or synthetic ?lamentous
structures,toobtainatoporrovingwithim
proved distribution or ?ber ends.
?ber will always be substantially completely
‘
Since it is obvious that many changes and
modi?cations can be made in the above-described
details without departing from the nature. and
spirit of the invention, it is to be understood that
the invention is not to be limited thereto except
drawn but may be extremely short as, for in
stance, 0.1 inch or less, or may be several inches
in length. It the lead end oi’ the ?ber is substan
tially completely drawn for somedistance due to
breakage near the front roll, there may be no
forth in the appended claims.
portion of the ?ber that will remain substantial 10 asIset
claim:
v
r
ly completely undrawn, and such a ?ber may .
1. An apparatus for converting tow to top by
have the shape such as is depicted in Figure 10.
the stretch-breaking method, which comprises
The ?ber, such as previously“ described, can be
retaining rolls and drawing rolls, said retaining
produced in accordance with this invention over
a very wide range or lengths and, together with 15 and drawing rolls being positioned relative to
each other to provide therebetween a reach vary
the in?nite variations in diameters possible, such
ing in length from end to end.
?bers are eminently suited for use in certain sys
2. An apparatus for converting tow to top
term of spinning, such as the worsted system.
by the stretch-breaking method, which comprises
Most important oi! all is the improved overlapping
‘retaining rolls and drawing rolls angularly dis
oi’ ends that apparently results from these ar 20
posed relative to each other to provide a reach
rangements or draft-breaking rolls, which en
therebetween varying in length from end to end.
3. An apparatus for converting tow to top by
ables subsequent spinning of yarns having excel
lent physical properties. By means or this inven
the stretch-breaking method, which comprises
tion, a tow is converted into a top without de
’ straying the continuity of the tow and silver and 25 retaining rolls and drawing rolls angularly dis
posed with respect to said retaining rolls to pro
theparallelism oi’ the ?bers, and a top is produced
vide a reach therebetween varying in length from
from which yarn can readily be spun and in which
end to end.
the individual ?bers have varying a?lnity for dye
4. An apparatus for converting tow to top by
stuil's so that many variegated colors and shades
the
stretch-breaking method, which comprises a
can be produced by dyeing the‘ yarn in a single 30
set oi’ retaining rolls and two sets of drawing
dye bath. Because there is excellent overlapping
rolls, each of said sets‘ot drawing rolls being po
of ?ber ends in the top, it is possible to draw the
sitioned relative to said retaining rolls to receive
top down to an acceptable yarn with fewer sub
a separate group 01’ ?bers and angularly disposed
sequent drawing, blending and twisting steps than
have previously been found necessary, with sub- .
stantial savings in spinning cost. Furthermore, I
‘?ner, stronger yarns can be made due to the ex
with respect to said retaining rolls to provide a
Leach therebetween varying in length from end
>
end.
5. An apparatus for converting tow to top by
cellent distribution and overlapping of ?ber ends.
the stretch-breaking method, which comprises re
While this invention hasbeen described more
taining rolls and drawing rolls, said drawing rollsv
speci?cally in terms or converting nylon tow and 40 being irusto-conical in shape
and positioned rela
the like to top, it is also applicable to'any type
tive to said retaining rolls to provide a, reach
of continuous ?lament tow, whether the ?laments
varying in length from end to end between said
‘constituting the same are cold-drawable or not, as
retaining rolls and said drawing rolls.
for instance, viscose rayon, cellulose acetate ~
,
VERNAL R. HARDY.
Документ
Категория
Без категории
Просмотров
0
Размер файла
488 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа