US2398729A - Filament extrusion device - Google Patents

Description

April 1.6, 1946. R. J. TAYLOR E1 AL FILAMENT EXTRUS ION DEVICE I ll/ Al l Filed June 29, 1945 INVENTORS. 5597 J 7, 1 2 0/? WESLEY W555 ATTORNEY.

Patented Apr. 16, 1946 FILAMENT Ex'raUs'roN navrca Robert J. Taylor, Claymont, Del., and Wesley L. Webb, Glen Moore, Pa., assignors to American Viscose Corporation, Wilmington, DeL, a corporation of Delaware application June 29, 1943, Serial No. 492,702

8 Claims.

This invention relates to filament extrusion devices and is particularly concerned with a novel type of extrusion device adapted to spin a plurality of spinning materials to form filaments of different sizes, compositions or both therefrom simultaneously.

It is an object of this invention to provide an extrusion device comprising a plurality of filament forming orifices, certain of which are arranged to be supplied through a separate channel from that through which certain others of the orifices are fed. A further object is to provide a multiple chambered extrusion device, at least f two chambers or two groups of chambers thereof being associated with separate feeding channels and separate orifices or groups of orifices. A further object is toarrange the chambers of such an extrusion device to facilitate uniform distribution of the spinning materials to the orifices associated with either chamber or groups of chambers. A further object is to so arrange the chambers and orifices or separate groups of chambers and orifices that the different filaments are thoroughly intermingled in the filamentary bundle issuing from the spinneret associated therewith. Further objects and advantages will be apparent from the drawing and the description thereof.

In the drawing, illustrative of the invention,

Figure 1 is a mid-section of one embodiment of the extrusion device of the invention,

Figure 2 is a cross-section thereof on line IIII of Figure 1,

Figure 3 is a mid-section ofanother embodimen Figure 4 is a cross-section on-line IV-IV-of Figure 8,

Figure 5 is a cross-section on line V-V of Figure 3, and

Figure 6 is a cross-section Figure 3.

In Figures 1 and 2, the spinneret 2 is attached on line VI-VI oi to a supply head 3 for th spinning material or solution by a coupling 4. A gasket 5 is positioned between the flange of the spinneret 2 and the supply head I to assure a tight seal. Feed pipes 8 and I communicate with passages 8 and 9 re- 1 spectively; A transverse partition l divides the space back of the spinneret face into two completely separate regions each associated with a distinct group of orifices II and with but one of the feed passages 8 and 9. To assure that the partition ill is held in proper position; it maybe secured to or be formed integrally with a cylindrical sleeve l2 fitting within the side walls of the spinneret and of the recess l3 in the supply head 3. j a

The extrusion device of Figures 1 and 2 lends itself readily to operation under a variety of conditions for various purposes. For example, lines 6 and 1 may be connected to separate pumps which may be connected to a single spinning material supply line or to separate suppl lines. Where they are connected through separate pumps to a single supply of spinning material, the pumps may be operated independently of one another at diiferent speeds to yield filaments of different sizes.

Under such circumstances, the orifices associated with one of the passages 8 or 9 may, if desired, be of different size or more numerous or both of different size and more numerous, than those associated with the other to allow of further variation in the filaments obtained.

Where the lines 6 and l are connected with separate supplies of spinning materials, the filamensize or more numerous, or both of different size and more numerous, than those associated with the other passage. In this arrangement, the extrusion device lends itself to thefsimultaneous spinning of two or more difierent kinds of filaments which may be of the same or of different diameter. The several kinds of filaments may be present in any desired proportion since such spinning conditions as number of orifices, size of orifices and pump speed for each spinning material are independently controllable. Thus a bundle comprising a mixture of filaments formed from different viscoses, from different cupramor a cellulose ester, such as cellulose acetate, and

the resin or ester filaments in the resulting iully set yarn or bundle may be activated after fabricae tion by knitting, weaving, braiding, doubling and the like to produce ladderprooi' knitted structures and stable woven, braided, and corded structures. Again, solid filaments may be formed simultaneously with hollow filaments of the same or different constitution. For example, filaments which may be of fine diameter may be spun from .one solution of a copolymer of vinyl acetate and vinyl chloride and hollow filaments of larger diameter may be spun from a similar solution containing a gas generating agent and such a mixture may be used to produce light weight filamentous mat products such as are disclosed in the copendlng application for United States Letters Patent of Robert J. Taylor, Ser. No. 490,009 filed June 8, 1943. In general. the extrusion device finds ajwide field of usefulness in the production of yarns and fabrics of mixed textile fila- .ments of continuous or discontinuous nature.

of line's.(6 and l), passages (8 and 9), and the proper partitioning of the space back of the spinneret face.

Figures 3 to 6 show a. modification in which the space immediately back of the spinneret face is divided by a, plurality of concentric partitions 20 (three being shown though any number may be used) into concentric annular chambers Ci, Ca, Ca about a central chamber C. These partitions 20 may extend from a transverse plate 2| secured in or integrally formed in a sleeve 22 fitting within the walls of the spinneret 2 and the recess It in the supply head 3. In the space back of the plate 2!, there is disposed a distributor member having a transverse plate 23 from which the concentric partitions 25 extend into contact with plate 2|. A transverse rib or partition 25 divides the space back of the plate 23 into two compartments or chambers. A locating pin 28 extends from a bore in one of the walls 27 extending back of. the plate 23 through a slot in sleeve 22 to a slot 28 in the supply head 3. This locator pin 26 is arranged so that the passages 8 and 9 are each associated with only one of the compartments on either side of the rib 25. Passages 29 connect that one of the compartments communicating with passage 9 with alternate regions or chambers including the central region or chamber between the concentric partitions while passages 30 connect the other compartment communicating with passage 8 to the other annular regions or chambers between partitions 24. Passages 3i connect corresponding regions and chambers in front of and in back of the plate 2|. The orifices 32 of the spinneret are arrangedin concentric circles so that one circle is associated with but one of the annular chambers C1, C2, and Cs and a central orifice isassociated with the central chamber C.

If desired, a plurality of circular rows of spinneret orifices may be associated with a given one of the'chambers C1, C2, and C3. The partitions 20 and 24 may be arranged to provide any number of annular regions or chambers for spinnerets having a greater numberof circles of orifices. Also the device may be arranged to spin filaments'from three, four or more spinning materials by changing the rib partition 25 into one of Y-shape, X-shape or other shape to divide the space back of plate 23 into three, four, or more compartments andproviding additional groups of passages similar to 29 and 30 associated with separate annular regions or chambers alternating with those associated with passages 29 and 80 in any desired sequence.

As in the device of Figures 1 and 2, that of Fgures 3 to 6 is adaptable to the production of filamentary bundles composed of mixtures of a plurality of types of filaments in any desired proportions and having any desired filament sizes. Both devices may spin mixtures of filaments of difierent kinds and of different sizes and the filament of one type may be of different sizes as well. The device of Figures 3 to 6 has the advantage of more uniformly and more thoroughly intermingling the filaments of .diiferent types and permits of close control over such intermingling and distribution. The device of Figures 3 to 6 lends itself to the accomplishment of all of the objectives mentioned above in connection with the device of Figures 1 and 2.

In the claims, the terms "alternate and alternating are intended to refer to the members of a repetitive series of two or more than two members.

It is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as defined by the appended claims.

We claim:

l. A filament extrusion device comprising a spinneret having a plurality of circular orifices, a space back of the spinneret face, partition means comprising at least one annular partition within the space dividing it into a plurality of chambers, each of such chambers communicating with a separate group of spinneret orifices, and a plurality of separate spinning material supply passages, each communicating with at least one chamber separate from the remainder of the chambers with which the remainder of the supply passages communicate.

2. A filament extrusion device comprising a I spinneret having a plurality of orifices, a space back of the spinneret face, at least one annular partition within the space dividing it into concentric chambers, each communicating with a separate group of spinneret orifices, and separate spinning material supply passages communicating with the respective chambers.

3. A filament extrusion device comprising a spinneret having a plurality of orifices, a space back of the spinneret face, a plurality of generally annular partitions dividing the space into a plurality of substantially concentric chambers each communicating with. a. separate group of spinneret orifices, and a plurality of separate spinning material supply passages each communicating with a separate group of chambers.

4. A filament extrusion device comprising a spinneret having a plurality of orifices, a space back of the spinneret face, a plurality of generally annular partitions dividing the space into a plurality of substantially concentric chambers,

each communicating with a separate group of spinneret orifices, and a plurality of separate spinning material. supply passages, each com municating witha separate group of chambers, the chambers with which one of the passages communicates alternating with the chambers with which-the other passage or passages communicate. v

5. A filament extrusion device comprising a spinneret having a plurality of concentric groups of orifices, a space back of the spinneret face, a plurality of generally annular partitions dividing the space into a plurality of'substantially concentric chambera'each communicating with a separate group or epinneret orifices, and a plurality of separate spinning material supply passages, each communicating with a separate group of chambers, the chambers with which one of the passages communicates alternating with the chambers with which the other passage or passages communicate.

, 6. A filament extrusion device comprising a spinneret having a plurality of orifices, a space back of the spinneret-face, partition means comprising at least one annular partition within the space dividing it into a plurality of chambers, distributor means back 01 the partition m'eans dividing the space immediately in back of the partition means into a plurality of regions each communicating with a separate corresponding chamber, the distributor means also dividing the more remote space back of the partition means into a plurality of compartments, passages in the distributor means, each compartment being connected by a separate group ofthe passages to a separate group of the regions, and a plurality of separate spinning material supply passages, each communicating with a separate compartment.

'7. A filament extrusion device comprising a spinneret having aplurality of concentric groups of orifices, a space back of the spinneret face, a plurality of generally annular partitions dividing the space into a plurality of substantially concentric chambers, distributor means back of the annular partitions dividing the space therebehind into a plurality of substantially concentric regions each communicating with a separate corresponding chamber, a rib on the distributor means dividing the more remote space back of the distributor means into at least two compartments, passages in the distributor means between one of the compartments and a group of the regions and other passage between at least one other compartment and a separate group of the regions, and at least two separate spinning material supply passages, each communicating with a separate compartment.

8. A filament extrusion device comprising a spinneret having a plurality of concentric groups of orifices, a space back of the spinneret face, a

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