вход по аккаунту


код для вставки
Oct.‘ 22, 1946. ‘ ‘
‘H. c. R. FOLMER
Filed’ Jan. 19._ 1944
_ .
Q/ \
1 >
Patented Qct. 22, 1946
2,409,747 *
Herman C. It. Folmer, Swarthmore, Pa., assignor
to American Viscose Corporation, Wilmington,
Del., a corporation of Delaware
- Application January 19, 1944, Serial No. 518,803
2 Claims.
(Cl. 34-12)
This invention relates to an improved method
of drying staple ?bers.
overheating some ?bers as compared with others,
is avoided.
the usual after-treating processes, have been
dried in tunnel dryers. Such drying methods are
During the drying, the ?bers are afforded op
portunity to freely shrink and twist, thus assur
ing a permanent, natural crimp therein, which
not entirely satisfactory.
improves their cohesiveness. Yarns fabricated
Heretofore, stable ?bers, after being treated by
from such uniformly dried ?bers possess uni
form non-varying residual shrinkage capacities
of moisture from the atmosphere under ordinary
and strengths throughout their lengths. It is
conditions of exposure thereto. The amount of
moisture so absorbed varies, depending upon the 10 possible, according to the invention, to effectively
and uniformly control the residual moisture con- '
particular type of ?ber, being, in the case of
tent. of the ?bers so‘that after drying they retain
?bers consisting of regeneratedcellulose, for ex
moisture in an amount substantially equal to the
ample, equal to about 7%. It is usual for the
amount of moisture which such ?bers normally
manufacturer to supply the textile trade with
?bers which retain a residual moisture content 15 absorb under conditions of ordinary exposure to,
the atmosphere.
equal, or substantially equal, to the amount of
Since, in the preferred embodiment of the in
moisture which the ?bers would normally absorb
vention, the wet staple ?bers, which are prefera
from the air, so that the ?bers will not undergo
bly fed into the apparatus continuously, at a con
further change due to moisture absorption.
Mly invention has as its ‘primary object the 20' stant rate of speed,‘ are loosened or opened, and
thus separated prior to becoming suspended in
provision of an economical method of drying
the hot aeriform current, the hot air readily and
staple ?bers which permits of the use of high
quickly permeates the ?bers and rapidly “?ashes
temperatures by means of which all of the staple
off” the moisture from the surface thereof.
?bers being treated are rapidly and uniformly
dried, and which permits of more precise control 25 ' The accompanying drawing represents a sim
pli?ed elevation illustrating in more or less dia
of the moisture content of the ?nal products.
grammatic form suitable apparatus for carrying
My invention contemplates subjecting the
' out the process of the invention.
moisture laden staple ?bers to the action of a
While the apparatus shown is preferred for
hot aeriform current in a closed circulating sys
tem, whereby the moisture contained in the fi 30 carrying out my improved drying process, the
bers is quickly evaporated, separating the dried - process is not to be considered as limited thereto.
Referring to the drawing, the system shown
staple from the moisture abstracted therefrom,
therein includes a heater or furnace l which may
and withdrawing the dehydrated staple from the
be coal, oil, or gas-?red, and to which is'con
nected a boiler 2 containing a heat transfer ma
In accordance ‘with the invention, the wet
It is known that fibers absorb a certain amount
. staple, which preferably undergoes a preliminary
terial, such as steam or a eutectic mixture of
opening or loosening operation, is suspended in
a constantly agitated heated aeriform current for
diphenyl and diphenyl oxide for example. An
expansion tank 3 is provided to take care of ex
pansion of the heat transfer material vduring
from. The staple ?bers are in contact with the 40 heating thereof. The heat transfer material is
circulated by means of circulating pump 4
air current for such a short time, usually not
through conduit 5 teen air heater 6 provided
longer than 5 seconds or so, that it is possible to
with an air ?lter ‘I, and in which the heat transfer
utilize air heated to very high temperatures, that
is temperatures above 200° F., say, of the order of 45 material gives up its heat to cold air being in
troduced through inlet 8,‘ after whcih it is recir
about 200 to 600° F., without impairment of the
culated‘to boiler 2 through conduit 9.
appearance or properties of the staple, thus
There are provided two vertically disposed con
greatly facilitating the ‘drying process and ma
duits ill and H and, disposed therebetween, a fan
terially reducing the time required therefor. Due
It having an inlet port It communicating with
to the fact that the air current is maintained in 50 the lower end of conduit I0 and an outlet port l5
a state of ‘more or less constant agitation, all of
communicating with the lower end of conduit l I,
the fibers suspended therein, and all parts of such
the upper end of which is connected to a cyclone
fibers, are in constant contact with the hot air,
separator It. It will be evident that the action
- a brief period, and then quickly separated there
so that all of the ?bers are dried at a substan-r
of fan l2 will draw a current of hot air down
tially constant and equal rate, and the danger of 55 wardly from the air heater 6 through vertically
disposed conduit l0, and force the same upwardly
through conduit l l into the cyclone separator l6.
Mounted in the top of the cyclone separator I6
drying unit, but several such units may be com
bined to provide a multi-unit drying system, in
which all of the air heaters of the individual units
is a ?ue or stack‘ IT for permitting the moist air
to ‘escape to the atmosphere, thus preventing the
are supplied by a heat transfer material circulated
thereto from a single boiler connected to a single
apparatus from becoming too humid and impair
centrally located furnace.
My improved method of drying results in staple
The wet staple ?ber in the form of a con
?bers of superior quality and improved tensile
tinuous blanket or mat is continuously fed
strengths. The process also has the advantage
through squeeze rollers l 8, which remove some of 10 that it may be carried out by means of apparatus
the excess moisture therefrom. The mass of
which may be operated for inde?nite periods of
ing the drying e?iciency thereof.
time, the wet staple being continuously supplied
thereto, and uniformly dried staple being con
tinuously withdrawn therefrom. Due to the rapid
?bers is then carried by conveyor band iii to a
blanket disintegrator 20, which breaks up the mat,
after which the loosened ?bers drop onto the con
veyor band 2| and are picked up therefrom by 15 circulation of the aeriform current in which the
the pins on an endless belt 22, which is shown as a
?bers are suspended there is no tendency for the
conventional Bramwell feeder, which opens and
?bers to adhere to the walls of the apparatus, and
loosens the wet staple. The opened ?bers are
frequent servicing thereof to relieve clogging is
removed from thefeeder by the brushing action
unnecessary. The apparatus which may be em
of wheel 23 which is provided with rubber strips 20 ployed requires a relatively small capital outlay
24, and drop to conveyor band 25, which trans
and does not require an excessive amount of floor
ports them through rotary seal 26 into conduit I0.
The ?bers are caught up by and become sus
Staple ?bers of any arti?cial or natural origin
pended in the hot air current drawn downwardly
may be dried according to my improved process,
through conduit In by fan l2. The current of hot 25 such as staple obtained by cutting continuous ?la
air carrying the ?bers in suspension therein is
ments consisting of regenerated cellulose from
forced upwardly by the action of fan [2 through
viscose or cuprammonium cellulose; cellulose de
conduit II and enters the cyclone separator IS
rivatives such as cellulose esters, particularly cel
on a tangent with the circumference thereof, and
lulose acetate; mixed cellulose esters; cellulose
is thereby made to take a‘ circuitous‘ path in the 30 ethers, as for example, ethyl cellulose; glass;
separator, the ?bers being thrown outwardly
mineral wool ?laments; resinous materials such
against the body walls of the separator, through
as acrylate resins; polyvinyl resins such as poly
centrifugal force, from which they drop by
vinyl chloride, copolymers of vinyl chloride and
gravity through vertically disposed conduit 21
vinyl " acetate, after-chlorinated polyvinyl chlo-.
onto conveyor band 28. The ?bers may be sul?
ride, and after-chlorinated copolymers of vinyl
ciently opened at this point and if so, they may
chloride and vinyl acetate; nylon; proteinaceous
be directed to a baling press bin and thence to a
baling press, or they may be subjected to an-ad- '
materials such as casein; natural silk, etc.
I claim:
ditional opening operation in which case they are
1. Method of handling moisture-laden arti
carried by conveyor band 28 through rotary seal 40 ?cial ?bers which comprises subjecting the ?bers
29 to an opener 30 in which they are again sub
in the form of a web to a disintegrating opera
jected to loosening or opening which, in this in;
,tion to loosen the ?bers, opening the loosened
stance, is e?ected while the staples are in the dry
state. .A fan- 3| is provided which, through suc
tion, draws the ?bers from the dry opener up
wardly through conduit 32 into separator 33, in
which the ?bers are separated from the carrier
air. From separator 33, the ?bers are discharged
into a baling press bin 34, and then to a baling
press 36. A ?lter bag 36 is provided to receive
any ?bers which adhere to separator 33 and which
are withdrawn therefrom by the action of fan 3|.
In the cyclone separator Hi, the ?bers are sep
arated from the drying air containing the mois
ture abstracted therefrom. A damper 31 is piv
otally mounted in fine or stack IT. The damper
31 is so adjusted that only-a predetermined por
tion of the moist air escapes through ?ue I‘! to
the atmosphere, the remainder thereof being re
turned through conduit 38 to air heater 6, where
it mingles and becomes admixed with cold air in
troduced to the heater through inlet 3. By
proper adjustment of the amount of moisture
laden air returned to air heater 6, and control of
the amount of cold air introduced through inlet
3, it is possible to constantly control the tem
perature of the air being circulated through the
system, which insures a uniform temperature and
?bers, continuously projecting the opened ?bers
thus a uniform rate of drying of the ?bers.
into a current of hot air, throwing the ?bers sus
45 pended in the air current upwardly along an un
impeded substantially vertical path to dry the
?bers while permitting uniform free shrinkage
thereof, continuously separating the dried ?bers
from the air after they have been in contact
50 therewith for a period of time not longer than
about ?ve seconds. and collecting all of the sepa
rated ?bers to prevent commingling thereof with
moisture-laden ?bers.
2. Method of ‘handling moisture-laden artié‘
55 ?cial staple ?bers which comprises subjecting the
?bers in the form of a web to a disintegrating
operation. to loosen the ?bers, opening the loos
ened ?bers, continuously projecting the opened
?bers into a current of hot air, throwing the ?bers
e0 suspended in the air current upwardly along an
unimpeded substantially vertical pathto dry the
?bers while permitting uniform free shrinkage
thereof, continuously separating'all of the dried
?bers from the air after they have been in con
65 tact therewith for a period of time not longer than
The apparatus illustrated comprises a single 70
about ?ve seconds, collecting all of the separated
?bers to prevent commingling thereof with mois
ture-laden ?bers, and subjecting the separated
?bers to further opening.
Без категории
Размер файла
354 Кб
Пожаловаться на содержимое документа