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Патент USA US3056180

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Oct. 2, 1962
L. P. DEIS
SPINNERET
Filed May 18, 1955
27
3,056363
, United States I atent O
1
3,056,163
_
_
SPINNERET
Lotus P. Deis, Westtown, Pa., assignor to American Vis
cose Corporation, Philadelphia, Pa., a corporation of
Delaware
Filed May 18, 1955, Ser. No. 509,349
10 Claims. (Cl. 18-8)
“
.3,05?,l53
Patented Get. 2, 1962
2
scale, taken through the face of the spinneret along the
line V—V of FIG. 2.
The spinneret of the present invention resembles a con
ventional spinneret in shape, with the addition of a ?uid
receiving chamber or trough extending around its ex
terior periphery. The exposed surfaces of the annular
wall and face of the spinneret, and walls of the ?uid re
ceiving chamber are coated with a thin layer of impervious
. The invention relates to a spinneret and more par
material, while the internal structure of the assembly is
tlcularly to a self-cleaning spinneret which is adapted to 10 porous as to permit the flow of ?uid therethrough. The
apply various ?nishing, colorant or additive solutions to
spinneret openings or capillaries are formed after the
?lament forming material as it is extruded through the
exposed surfaces have been coated, so that the major
spmneret capillaries or openings.
portion of the capillary walls are de?ned by the porous
In the spinning of ?lament forming solutions, especially
structure of the spinneret face. Fluid under pressure is
cellulose acetate, considerable dit?culty is often en 15 adapted to ?ow freely from the chamber through the
countered in starting the spinning solutions ?owing through
porous internal structure of the spinneret to the capillary
the spinneret capillaries to form a continuous and perfect
walls to ?ush the same of any foreign matter, or to be
strand. The capillaries, being of very small diameter,
applied to the ?lament forming material extruded there
are not readily and satisfactorily cleaned by known
through.
methods, and thus most any small fragment of foreign 20
As shown in the ‘drawings, the spinneret has a con
matter clinging to the walls of any one of the capillaries
ventional cup-shaped body including an annular or tubu
will cause the solutions extruded therethrough to flow as
llar wall 11 and a face 13 integrally formed by sintering
a viscous mass along the face of the spinneret, rather than
a powdered material, as for example stainless steel par
being extruded as a ‘continuous strand or ?lament. This
ticles, under high temperature and pressure in a suit
undesirable action on the part of the extruded solutions 25 ably shaped mold. Extending around the external periph
disrupts the continuity of the ?uid extruded through the
ery of the annular wall 11, adjacent to its inlet end, is a
other capillaries, necessitating the cleaning or replacement
circular ?uid receiving chamber or trough 15 having a
of the spinneret itself.
side wall 17 and a bottom wall 19, with the Wall 19 pro
Further, it is often desirable to have the extruded strand
vided with a ?uid inlet opening 21 de?ned by a collar
possess a certain ?nish, color, or other characteristic which 30 23. Any suitable means, as for example external threads,
is imparted to the ?lament forming solutions by the use of
may be provided on the collar 23 to facilitate attach
various additives or colorants. Normally these additives
ment of ?uid conduit means thereto. The walls 17
and colorants are incorporated into the mixer in which
and 19 are ‘also fabricated by sintering, under high tem
the ?lament forming solution is ?rst formed, or are inter
perature and pressure, a powder material of the same type
mixed with the solution after its formation and before its 35 as employed in the spinneret body, and may be formed
extrusion through the spinneret. However, these known
either integrally with the spinneret body or as a sepa
methods of imparting desirable properties to the ?lament
ary strand render it difficult to maintain control of the
rate unit, with the ?rst mentioned procedure being pref
erable. The sintering procedure employed provides the
quality of the particular characteristic imparted to the
spinneret body and chamber walls with a strong but
?lament and also lack ?exibility, as for example when ?la 40 porous structure, as shown at 25, through which ?uids,
mentary strands having treated sections of relatively short
under pressure, ‘are able to flow. The strength of these
length are desired. It is therefore an object of the in
vention to provide a generally new or improved and more
satisfactory spinneret.
members and the rate at which they conduct ?uids may
be readily controlled by the particle size of the powdered
material and sintering temperatures and pressures.
7 Another object is to provide a spinneret having capil
The top of the chamber 15 is formed by an annular
laries which may be ?ushed clean without removal of 45 plate 27 fastened, in a ?uid-tight manner, to the walls 11
the spinneret from its operating position.
and 17 of the spinneret assembly. The plate 27 need not
Still ‘another object is the provision of a spinneret hav
be of porous construction and is preferably formed of a
ing a porous internal structure through which ?ushing,
material, for example stainless steel, not readily attacked
‘colorant, and additive ?uids may be forced to and through
by the solutions normally employed. All of the exposed
50
the capillary walls.
surfaces of the spinneret assembly are then coated or
A further object is the provision of a spinneret having
plated with a thin layer 29 of impervious material, as
an integral ?uid supply chamber from which various ?ush
for example stainless steel, while the inlet opening 21 is
ing, colorant, or additive solutions may be forced through
temporarily sealed with a suitable stopper, after which
the porous interior structure of the spinneret to the spin
the openings or apertures or capillaries 31 are formed in
55 the spinneret face ‘13. By punching the capillaries 31
neret capillaries.
A still further object is the provision of the spinneret
after the assembly has been coated, it will be evident that
which is simple in construction and use and may be
the major portion of the capillary walls are de?ned by
fabricated of readily available and economical materials.
the internal porous structure of the face 13. From the
These and other objects and advantages of the invention
structure described thus far, it is seen that ?uid forced
60
will be apparent from the following description and ac
into the chamber 15, after its temporary seal is removed,
companying drawing in which:
is adapted to ?ow along the porous internal structure of
FIG. 1 is a top view of the spinneret of the present
the annular wall 11 and face 13 of the capillaries 31, as
shown by the arrows 33 and 35 in FIGS. 4- and 5, and is
invention;
con?ned to its path by the impervious exposed surfaces
FIG. 2 is a central vertical section taken on the line
65 29 on either side of the porous internal structure.
11-11 of FIG. 1;
FIG. 3 is a fragmentary horizontal section, on an en
With regard to the walls 17 and 19 of the chamber 15',
larged scale, taken through the wall of the spinneret along
it will be noted that their internal surfaces remain un
the line III—III of FIG. 2;
coated and therefore ?uid from the chamber can pass
FIG. 4 is a section similar to FIG. 3 taken along the
through these walls to the wall 11 of the spinneret, in
line IV—IV of FIG. 2; and
addition to the direct passage to the wall 11 as shown in
FIG. 5 is a fragmentary vertical section, on an enlarged
FIG. 4. The walls 17 and 19 of the chamber are prefer
3,056,163
3
ably sintered simultaneously with the wall and face of
the spinneret since forming these elements as a unit sepa
rate from the spinneret body requires extreme care to
prevent blocking of the porous structure of the wall 11 at
the point of connection of the Walls 11 and 19.
In use, the ?uid is forced by any suitable manner, not
shown, through the inlet opening 21 into the chamber 15.
4
ing a tubular wall, a face extending across one end of
said wall, said Wall and face having impermeable inner
and outer surfaces, walls de?ning at least one aperture
extending through said face, ?uid passage means extend
ing between said inner and outer surfaces and communi
cating with said aperture and means carried by said tubu
lar wall for delivering ?uid to the aperture through said
Su?icient pressure is employed to force the ?uid as above
described to the capillary Walls so as to ?ush the same of
?uid passage means.
various characteristics are Wanted.
which are sintered into a compact mass.
6. A spinneret for forming arti?cial ?laments includ
any foreign matter. After ?ushing, other ?uids may be 10 ing a tubular wall, a face extending across one end of
said wall, walls de?ning an aperture extending through
forced into the chamber 15 and caused to ?ow along the
said face, con?ned ?uid passage means extending along
wall 11 and the face 13 to the capillaries, and impart to
said tubular wall and face and communicating with said
the ?lament forming solutions extruded therethrough, any
aperture and means carried by said tubular wall for deliv
desirable ?nish or color. It is seen that the additive ?uid
ering ?uid to the aperture through said con?ned ?uid
can be changed when desired without in any way stop
passage means.
ping or altering the extrusion of the ?lament forming
7. A spinneret as de?ned in claim 1 wherein the porous
material through the spinneret capillaries, and thus the
?uid permeable structure is ‘formed of metal powders
spinneret provides excellent ?exibility when ?laments of
It is seen from the above description that the objects
of the invention are well ful?lled by the structure de
scribed. The description is intended to be illustrative
only and it is to be understood that changes and varia
tions may be made without departing from the spirit and
scope of the invention as de?ned by the appended claims.
I claim:
1. A spinneret for forming arti?cial ?laments includ
ing a tubular wall, a face extending across one end of
said wall, said wall and face having impermeable inner
and outer surfaces, a porous ?uid permeable structure >
extending between said inner and outer surfaces, Walls de
?ning at least one aperture extending through said face
and communicating with said porous ?uid permeable
structure and means connected to said tubular wall for
delivering ?uid to the aperture through said porous struc
ture.
2. A spinneret for forming arti?cial ?laments includ
8. A spinneret as de?ned in claim 2 wherein the
porous ?uid permeable structure is formed of metal
powders which are sintered into a compact mass.
9. A spinneret as de?ned in claim 6 wherein the con
?ned ?uid passage means is formed of metal powders
sintered into a compact mass.
10. A disk-like member for use in forming ?lament
strand materials, ‘said member having impermeable inner
and outer surfaces, a porous ?uid permeable structure
extending between said inner and outer surfaces, said
porous ?uid permeable structure being formed of metal
powders which are sintered into a compact mass, walls
de?ning apertures extending through said member and
communicating with said porous ?uid permeable struc
ture, and means for delivering ?uids to the apertures
through said porous structure.
References Cited in the ?le of this patent
UNITED STATES PATENTS
ing a tubular wall, a face extending across one end of
said Wall, said wall and face having impermeable inner
and outer surfaces, a porous ?uid permeable structure 40
extending between said inner and outer surfaces, walls
de?ning at least one aperture extending through said face,
and a ?uid supply trough carried by said tubular wall,
said Walls de?ning said aperture and said ?uid supply
trough communicating with said porous ?uid permeable 45
structure and thereby providing a continuous ?uid path
from the trough to said aperture through said porous
?uid permeable surface.
3. A construction as de?ned in claim 2 wherein said
trough extends circumferentially about the exterior 50
periphery of said tubular wall.
1,604,216
1,654,936
2,233,987
2,324,397
2,377,810
2,450,457
2,588,584
2,597,553
2,677,148
2,687,944
2,702,230
2,703,433
Brainin _____________ .._ Oct. 26,
Jones ________________ __ Jan. 3,
Orsini ______________ _._ Mar. 4,
Hull ________________ .__ July 13,
Robbins ____________ __ June 5,
Te Grotenhuis ________ __ Oct. 5,
Small ______________ _._ Mar. 11,
1,003,082
637,212
France _____________ __ Nov. 14, 1951
Germany ___________ __ Oct. 24, 1936
4. A construction as de?ned in claim 2 wherein said
trough is an enclosed chamber having a ?uid inlet through
which ?uid may be supplied under pressure.
5. A spinneret for forming an arti?cial ?lament includ 55
Weber ______________ __ May 20,
Webb _______________ _.. May 4,
Johnson _____________ __ Aug. 31,
Olmer, ______________ _._ Feb. 15,
Holzmann ___________ .._ Mar. 8,
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