US3540080A

US3540080A - Device for the spinning of multicomponent synthetic fibers

Info

Publication number: US3540080A
Application number: US669663A
Authority: US
Inventors: Gunter Goossens
Original assignee: Inventa AG fuer Forschung und Patentverwertung
Current assignee: Inventa AG fuer Forschung und Patentverwertung
Priority date: 1966-09-21
Filing date: 1967-09-21
Publication date: 1970-11-17
Anticipated expiration: 1987-11-17
Also published as: CH486570A; AT318790B; NL6712909A; GB1194406A; NL141248B; DE1660410A1; FR1551952A

Description

DEVICE FOR THE SPINNING OF MULTICOMPONENT SYNTHETIC FIBERS Filed Sept. 21, 1967 S N E S S 0 O G G 5 Sheets-Sheet 1 S N A NS 0 l v 2 W I R "u N U G 4 5 3 vvu A 0 /An/ lk V lelwfm 6v. W, 1979 G. GOOSSENS 3,540,080

DEVICE FOR THE SPINNING OF MULTICOMPONENT SYNTHETIC FIBERS Filed Sept. 21, 1967 5 Sheets-Sheet a FIG. l6

INVENTOR. GUNTER GOOSSENS Nbv. 17, 197 ooss s 3,540,080

DEVICE FOR THE SPINNING OF MULTICOMPONENT SYNTHETIC FIBERS Filed Sept. 21. 1967 5 Sheets-Sheet 5 INVENTOR.

GUNTER GOOSSENS G. GOOSSENS Nov. 17, 1970 DEVICE FOR THE SPINNING 0F MULTICOMPONENT SYNTHETIC FIBERS 5 Sheets-Sheet 4* Filed Sept. 21, 1967 a w P I /L w @WA 7 7%/ I I A X N v v A \u 3 L 2 a N G n n F A 5 INVENTOR. GUNTER GOOSSENS G. GOOSSENS Nov. 17, 197% DEVICE FOR THE SPINNING OF MULTICOMPONENT SYNTHETIC FIBERS Filed Sept. 21-. 1967 5 Sheets-Sheet 5 a: m M F FIGBO INVENTOR GUNTER GOQSSENS States US. Cl. 188 3 Claims ABSTRACT OF THE DISCLOSURE A composite fibril is formed from at least two dopes. The dopes are composed of different polymers. The device is comprised of at least one guide plate, a nozzle plate and a guide pin. The guide plate has a first bore therethrough. The nozzle plate has a second here therethrough which opens into a nozzle aperture. The guide plate is disposed above the nozzle plate and forms therebetween at least one passage for at least one of the dopes. The first and second bores open into at least one of these passages. The guide pin is removably disposed wtihin the first and second bores and has a longitudinal third bore which communicates with the second bore. The guide pin has an exterior diameter which is less than the diameter of the second bore, tus forming another passage for at least another one of the dopes or for a fluid. The aperture is positioned adjacent to a common opening of the passages.

The invention relates to a device for the manufacture of synthetic fibers which consist of a single, several or a great number of individual fibrils, whereby the monoor multifilaments contain fibrils in unmixed disposition, made from spinning dopes which may differ in their characteristics. Such materials are known as multicomponent or mixed filaments.

The device according to the invention consists of a housing which may be a single unit or consist of several parts, also filters and spinning nozzles, and has a plurality of channels through which the several dopes are conducted separately to a filter and thence to the nozzle assigned thereto. Parts containing these dope channels can readily be exchanged and the nozzle ends can be shaped so that the cross section of the synthetic fibers produced can be formed at will. Therefore, the fibers produced may consist of composite fibrils of which each one may contain several or all of the different spun dopes in any desired and reproducible disposition; of which each one may contain only one kind of spun dope; or whereby fibers are produced consisting of a mixture of the differently constructed fibrils. The cross sections of these fibrils may be solid, hollow, round or out of round in many different shapes, as will be shown.

Synthetic fibers made of two or more structurally or materially different raw materials throughout their length are known. The purpose is to impart definite properties for subsequent treatment or to the end products when such properties cannot be attained with fibers made from a single raw material.

A large number of processes and devices for the manufacture of such multicomponent filaments have been disclosed since approximately 1930. However, the construction of the known mixed filament devices permits solely the manufacture of one single fiber type or at best that of a very few types, with regard to the composition of the individual spinning dopes. With few exceptions, the number of spinning dopes is limited to two.

atent ice US. Pat. 2,932,079 describes filaments which are very involved and may consist of up to five different starting materials. The device for this production has been disclosed in German published applications 1,047,984 and 1,152,219. These devices do not solve the problem which is the basis of the instant invention and, hence, are not comparable. Similar considerations are valid for a device described in British Pat. 1,019,052.

Moreover, the majority of the known devices do not enable a manufacture of multifilaments having a large number of individual fibrils as used in the manufacture of staple fibers. Another disadvantage of the known machines is their inferior operational safety, simplicity and sturdiness as compared to the instant invention which has these properties in the same manner as is common for single material fibers.

Spinning devices had been unknown to date which can be converted to a large number of multicomponent fibers. This is feasible with the instant device and is a salient feature thereof. It is desirable to have spinning machines which can be converted rapidly, simply and without substantial loss of dope, because the manifold potential applications of multiple component fibers require a corresponding plurality of the special fiber types and furthermore because economical limitations exist regarding the execution of fiber production programs, particularly since the commercial exploitation of specialized fiber types is limited.

The device according to the invention constitutes a component part of a spinning machine which can readily be replaced so that within a few minutes a change to a multicomponent fiber can be accomplished. The new fiber, of course, may differ at will from the one previously manufactured. The part removed from the machine can be used again and is not damaged. The device according to the invention produces multicomponent fibers consisting of composite fibrils each of which contain several spun dopes in unmixed but inseparable state, side by side.

As stated, it is feasible to manufacture multicomponent fibers consisting of a mixture of single-component fibrils, of a mixture of the different dopes or of mixtures of singleand multicomponent fibrils, and also of mixtures of differently shaped multicomponent fibrils.

This universal applicability of the device according to the invention is novel and a salient feature thereof. Moreover, the construction of the device assures safe operation, simplicity and sturdiness such as heretofore has been attained only with spinning matchines for singlematerial fibers. The machine is suited for the manufacture of multifilaments having a very large number of fibrils.

Composite or multicomponent fibrils are those fibrils whose cross sections are split up into zones of any desired shape, whereby each such zone contains only one of the several spun dopes. At the borders between the different zones, curved at will or rectilinear, the different spun dopes either are solidly interconnected in the manner of a weld; or they lie side by side unconnectedly, e.g., in the case of core-jacket fibrils in which the jacket can be displaced relative to the core; or in fibrils whose cross sections are divided into sector-like zones which later can be separated throughout the length of the fibrils or only at given locations.

As mentioned, such multicomponent fibrils can be manufactured with the device according to the invention in any desired shape. By using nozzles having a large number of apertures, the different dopes can be spun into multifilaments which are composed of like composite fibrils or of differently shaped composite fibrils. The latter are known as mixed filaments. Also, mixed filaments can be produced which consist of different single material fibrils or of mixtures of like or different composite fibrils.

Owing to these almost unlimited potential combinations of different dopes and diflerent characteristics in synthetic fibers having any desired cross section of the fibrils and any desired disposition of each zone containing the spun dope in the cross sections, the spinning machine can be employed for the manufacture of substantially all known multicomponent fiber types while even offering the opportunity of developing new types. As is evident from the literature, the development of new types heretofore had to be combined with the development of new spinning machines. This inhibits such development and increases the expenses.

Another salient feature of the invention resides in the use of nozzle plates having round or profiled nozzle apertures which have coarse bores at their entry side. Guide means can be inserted into these coarse bores, e.g., guide pins which may be partly or entirely hollow. They protrude into the coarse bores, have a shape which divides the bores into several, separated channels through which the dopes flow into the nozzle apertures, and are disposed in such a manner that just before each nozzle aperture the dopes are combined in such a manner that the cross section of the dopes flowing through the aperture forms zones of the desired shape. Each of these zones contains one of the dopes.

The guide means in the device according to the invention consist of guide plates disposed ahead of the nozzle plate and of guide pins sealed therein. These pins have internal bores throughout or in part, and channels may be provided by grooves or flattenings for the flow of the individual dopes. The nozzle plate, as is customary, contains the apertures. The guide pins protrude into the coarse bores which are the entries to the apertures. The exact functions and shapes of these guide pins will be explained below. These pins can be exchanged and used again.

A simple machine for the production of two-material core-jacket fibers has been disclosed in German Pat. 736,321 and contains two nozzle plates, one behind the other with given space therebetween. The apertures of the first plate form dope streams flowing through the space between the first and the second plate. The space admits the second dope. The streams formed by the first plate flow unguided through the space which is filled with the second dope, are jacketed by the latter, and leave the apertures of the second plate as core-jacket fibrils. A further development of this procedure is taught in U.S. Pat, 2,936,482. Asearly as 1882, US. Pat. 253,882 discloses a device for the extrusion of two materials in core-jacket form. The construction principally is the basis of a further main type of multicomponent spinning devices whose feature a it is to conduct the dope for the core through a tube or tube-like organs to a point shortly before the aperture of the spinning nozzle, and to wet the outside of the tube with the jacketing dope. The two dopes combine between the end of the tube and the aperture without mixing, so that the core-jacket shape is attained.

Several variations of this main type are constructions wherein the tube, seen from the rear, is set back behind the nozzle aperture, e.g., in US. 3,038,236, British Pat. 972,932, or Dutch Pat. 6,509,283; or wherein the end of the tube is in a plane with the nozzle aperture, as in German Pat. 953,425, German published applications 1,047,- 984, 1,152,219 (both previously named) and 1,180,881, US. 3,014,237, Swiss Pat. 386,614 and Japan, 52,189, published under No. 1,285, on Feb. 1, 1966. The latter, however, lends itself solely to the spinning of single material hollow fibrils, US. 2,360,680 discloses a device wherein the end of the tube is in a plane with the nozzle aperture or protrudes therefrom.

Canadian Pat. 628,660 teaches comparative experiments with a spinning machine which is exchangeable according to the three variants named above. However, I have been unable to find any advantages regarding the position of the tube, whether coinciding with, or protruding beyond the nozzle aperture, over that where the tube ends before the aperture, i.e., inside the nozzle. Hence, these constructions do not differ much from that in the named German Pat. 736,321.

The device according to the invention also uses tubelike organs, i.e., the previously named guide pins. These preferably end within the nozzle body and do not protrude into the aperture itself. An exception is the embodiment for spinning of multicomponent hollow fibrils. The guide pins, moreover, diifer substantially from the tubes named above. This difference resides in the particular shape of the pins with the aid of which the individual dope streams are conducted inside the coarse bores to flow through the nozzle apertures in such a manner that each stream assumes a portion of the cross section of the finished fibril, whereby the shape and size of this cross section is predetermined and reproducible.

A number of shapes of fibrils can be prepared with the apparatus of the present invention. For example, a twocomponent sector fibril (used for crimped thread); a twocomponent core-jacket fibril or a two-component corejacket fibril with triple-lapped cross section used, e.g., for combining the strength characteristics of the core material with the surface properties of the jacketing material or for the application in dull threads without incorporation of inorganic deadening agents, such as TiO a threecomponent sector fibril; a three component core-jacket fibril; a three-component core-jacket fibril having a sector core; a four component core-jacket fibril having a three-part sector core; a three-component core-jacket fibril with divided jacket; a four-component core-jacket fibril having a tripartitioned jacket; a two-component sector fibril having a curved border line between sectors, e.g., for crimped thread; a two-component core-jacket fibril having an eccentric core, e.g., for crimping effects; a threecomponent core-jacket fibril with dual core, e.g., for jacketed crimped threads; a four-component core-jacket fibril with triple core; an out-of-round two-component fibril for crimped thread; a two-component fibril having a jacket-like cross section; a two-component fibril having a flat cross section; a two-component fibril with triple-lapped cross section, e.g., for application in crimped threads; a two-component fibril with triple-lapped cross section, e.g., for crimped thread; a three-component core-jacket fibril having flat cross section and a divided core; a three-component core-jacket fibril with triple-lapped cross section and a divided core, for jacketed crimped threads; a twocomponent hollow fibril of the core-jacket type; a twocomponent sector-type hollow fibril; or a two-component hollow fibril having quadruple-lapped cross section.

The invention now will be more fully described with reference to the accompanying drawings. However, it should be understood that these are given merely by way of illustration, and not of limitation, and that it is intended to cover all modifications and variations which do not constitute a departure from the spirit and the scope of the invention as hereinafter claimed.

Albeit the devices represented in the drawing show the dopes flowing downwardly, leaving the nozzle apertures at the bottom, this is deemed only a preferred manner, used especially in melt spinning. The devices according to the invention, however, are applicable to other spinning methods, so that the flow direction and the position of the devices can be varied at will to suit the purpose and the spinning machine.

In the drawings:

FIG. 1 is an elevation of a two-component spinning nozzle, approximately twice enlarged;

FIG. 2 is an elevation of one part as shown in FIG. 1, five times enlarged;

FIG. 3 is a section taken along lines A--A of FIG. 2;

FIG. 4 is a section taken along lines BB of FIG. 2;

FIG. 5 illustrates the shape of the nozzle aperture in FIGS. 24, enlarged 15-20 times;

FIG. 6 is an elevation of another embodiment of a spinning element;

FIGS. 7 and 8 are sections taken along lines AA and BB, respectively, of FIG. 6;

FIG. 9 shows the nozzle aperture of FIGS. 6-8, enlarged 15-20 times;

FIG. 10 is an elevation of a spinning element for twocomponent core-jacket fibrils with triple-lapped cross section;

FIGS. 11 and 12 are sections taken along lines A--A and BB, respectively, of FIG. 10;

FIG. 13 shows a nozzle aperture of FIGS. 10 12, enlarged 10-20 times;

FIG. 14 is an elevation of a spinning element for corejacket filaments having a two-component fibril with triplelapped cross sections;

FIGS. 15 and 16 are sections taken along lines AA and BB, respectively, of FIG. 14;

FIG. 17 shows the shape of a nozzle aperture of FIGS. 14-16;

FIG. 18 is an elevation of a spinning element, enlarged approximately 10 times;

FIG. 19 is a perspective view of a guide pin, enlarged approximately 2.5 times, for use in the production of two component core-jacket fibrils;

FIG. 20 is an elevation of a spinning element showing a guide pin according to FIG. 19;

FIGS. 21 and 22 are other embodiments of guide pins, in perspective;

FIG. 23 is an elevation of a spinning element for threecomponent filaments;

FIGS. 24 and 25 are sections taken along lines AA and B-B, respectively, of FIG. 23;

FIG. 26 is an elevation of another embodiment similar to FIG. 23;

FIGS. 27 and 28 are sections taken along lines AA and BB, respectively, of FIG. 26;

FIG. 29 is an elevation of a spinning element for twocomponent hollow fibers, enlarged approximately 7 times;

FIGS. 30-33 are sections taken along lines AA, BB, C'C and DD, respectively, of FIG. 29;

FIG. 34 shows a nozzle aperture of FIG. 29 for producing a three-component sector fibril.

Referring now to the drawings:

The device for spinning the fibrils of the present invention has as its salient feature guide means in the form of fully or partially drilled guide pins which protrude into the coarse bores mentioned above; which have the entry ends sealed in particular guide plates; and which are so inserted in each other, corresponding to the number of the spinning dopes used, that they can readily be disassembled for cleaning purposes. The amount of guide pins per nozzle aperture is reduced by 1 relative to the number of dopes, so that channels are formed for these dopes together with coacting flat areas, longitudinal or vertical grooves, vertical bores, as well as with fiat areas and longitudinal grooves formed with the coarse bores in the nozzle plate.

In FIG. 1, a two-component spinning nozzle is shown in elevation and approximately twice enlarged. This nozzle is suited for the production of two-component corejacket fibrils.

The core dope is introduced from the top and first enters through 6 into the bores 8 of guide pins 5 which are fastened in guide plate 2. The jacketing dope is introduced radially from the side and enters through bores 7 in space 3 between nozzle plate 1 and guide plate 2. It then flows through the annular channels 10, formed by the coarse bores and the guide pins 5, protruding therein, into the spaces above nozzle apertures 4. There it is combined with the core dope coming from the interior of pins 5 through bores 9.

Because of the laminar flow, due to the high viscosities of the dopes, and because of the small cross sections of the channels, no intermixing of the dopes occurs.

In FIG. 2, a 5 times enlarged elevation of the device of FIG. 25 is shown.

A similar embodiment is shown in FIGS. 6 to 9. The embodiment relates to that shown in FIG. 20, discussed below. The reference numerals are the same as for FIGS. 25, and shows, in addition, a channel 11, connected to bore 8 by a cut. Both

channels

10 and 11 have a segment-line cross section.

A similar embodiment is shown in FIGS. 10-13.

Another similar embodiment is illustrated in FIGS. 14-17.

The element shown in FIG. 18, has bore 8 in guide pin 5. The latter is sealed in guide plate 2 and protrudes into the coarse bore of nozzle plate 1 in such a manner that a channel 10 of annular diameter is formed through which the jacket dope 12 flows and combines with core dope 13 at nozzle aperture 4 without mixing so that the annular core-jacket disposition is maintained after spinning of the fibril.

A guide pin is shown in perspective in FIG. 19, suited for use in spinning nozzles as described and for the manufacture of two-component core-jacket fibrils. The reference numeral 4' is the outlet bore.

According to the invention, any desired disposition of the dope flow can be attained by corresponding shaping of the guide pins. FIG. 20 illustrates the function of a guide pin in a spinning element in which it is installed. The introduction of the dopes is the same as in FIG. 18. However, the guide pin 5 here has no through bore, but a blind end bore 8. The dope flowing through this bore leaves through a cut 10a on the side and enters channel 14a by way of channel 14. The second dope flows from the hollow space 12 through channel 11 into 11a. 11a and 14a combine in the form of a V, shown as 1'5, and connect with aperture 14. The two dopes leave the nozzle therethrough.

Channels

11, 11a, 14 and 14a have segment-shaped cross sections formed by correspondingly cutting the guide pin 5. The cross section of the latter is chosen so that it exactly fits the coarse bore of nozzle plate 1, so that the

channels

11 and 14 are entirely separate from each other.

A guide pin which can be used in the same manner, but for the manufacture of fibers whose fibrils have twocomponent sector fibrils in cross section is shown in FIG. 21. 7a and 7b are cuts which form the segmentshaped channels together with the wall of the coarse bore. 10a is a cut to the side opening of the entry bore in the interior of the pin. are inclined surfaces to form the V, 15.

Another guide pin is shown in FIG. 22, for the manufacture of a two-component core-jacket fibril having an eccentric core. The outlet bore for the core dope is shown as 4'. 7c is a cut which, together with the wall of the coarse bore, forms a segment-shaped channel with the aid of which the eccentric fibril jacket is created.

A spinning element for the production of three-com- \ponent fibers having in cross section a three-component core-jacket fibril, a three-component core-jacket fibril having flat cross section and a divided core or a three-component core-jacket fibril with triple-lapped cross section and a divided core fibril cross sections is given in FIG. 23, enlarged about 5 times.

The three-component spinning nozzle consists of the guide plates 2 and 2a, nozzle plate 1, and guide

pins

5 and 5a. The latter are inserted one into the other and commonly protrude into the coarse bores of nozzle plate 1. The core dopes enter at 13 and longitudinal bore 13a in pin 5 and flow through

channels

10, 11 and 14a, respectively, to aperture 4. The jacket dope enters at 12, rflows through channel 16 having annular diameter, and also reaches nozzle aperture 4.

FIGS. 26-28 correspond to the embodiment just described, but produce fibers having in cross section a threecomponent core-jacket fibril with a divided jacket. The core dope flows to aperture 4 through channel 13a, the

7 jacket dopes through

channels

10, 11 and 14. Channel 10 has a side opening 10a cut out.

As shown in FIGS. 24-28, the device according to the invention has, as a salient feature, the guide pins tightly sealed at their inlet openings to guide plates. The latter are provided with bores coaxial with the coarse bores of the nozzle plate and spaced so that, between the guide plates or between nozzle plates and one guide plate, respectively, spaces are generated for the spinning dopes, except those introduced radially. Through these spaces, the dopes are conducted to the guide pins and the coarse bores, While a further dope (the exception named) is introduced axially to the guide plate which is farthest from the nozzle plate.

Another salient feature consists in the provision whereby the bores in the guide plates, coaxial with the coarse bores in the nozzle plate, can carry differently shaped guide pins in each bore or guide pins of different composition so that mixed fibers of differently composed fibrils can be manufactured.

British Pat. 1,035,908 discloses a spinning device which also can produce mixed fibers of differently shaped fibrils. However, in contrast to the instant invention, the manufacture is limited to mixed fibers of single material fibrils and those of single and double component fibrils, whereby the double component fibrils lmerely can have the shape in cross section of two component sector fibrils. Moreover, in the British patent, the different dopes are not transported separately to the nozzle apertures so that the danger of mixing is present.

FIGS. 2934 show a device for the production of twocomponent hollow fibers, FIG. 34 illustrating the nozzle shape for forming two-component hollow fibrils having quadruple-lapped cross section.

The element, in principle, is constructed like one for three-component fibers. The sole difference is in the nozzle aperture 4. The innermost guide pin has an extension 4a which reaches into the aperture. The spinning element shown is suited for the manufacture of fibers whose fibrils are two-component sector type hollow fibrils or two-component hollow fibrils having quadruple-lapped cross section according to the shape of the aperture. The dopes enter at 1'2 and 13 and separately are conducted through segment-shaped channels and 11 to the aperture 4, as described. A gas, e.g., air, is introduced at 6, or, in certain instances, a liquid which cannot be spun. The gas or liquid leaves through a fine bore 4b and forms the hollow core of the fiber spun through 4. Thus, a twocomponent hollow fibril is formed, or a two-component fibril filled with the non-spinnable liquid, which may or may not be removed. The salient feature of this embodiment is seen in the extension of the guide pin through the coarse bore to the actual aperture of the nozzle. The bore in the guide pin carries the gas or liquid. The extension of the guide pin is substantially flush with the lower end of the nozzle plate.

Spinning devices heretofore known which are provided with tubes or tube-like elements solely manufacture corejacket structures which have concentric or eccentric position of the core. One exception is described in the previously named German published applications 1,047,984 and 1,152,219. These devices, however, can be used only once, in contrast to the instant devices which are usable indefinitely. Also, the tubes extending into the nozzle apertures are divided into individual openings whose total cross section is larger than instantly required so that uniformity of the fibrils is jeopardized. The devices in the German disclosures are not capable of producing fibrils whose profiles are out of round and simultaneously of heterogeneous structure. With respect to the construction, there are considerable differences between these tube-like means and the instantly used guide pins. These are that in the latter, conventional nozzle plates can be employed, as known for the manufacture of single component fibrils so that, upon installation of the spinning machine, any

desired nozzle plates having round or any other cross sections of the apertures can be combined with any shape of guide pin. Moreover, the guide pins can furnish designs which cannot otherwise be produced and are unknown for, or by the use of, tubes. For instance, the side openings 10a in FIGS. 23 and 26 cannot be reproduced by tubes, nor can cross sections as shown in FIGS. 24-28.

I claim as my invention:

1. A spinning device for producing a compound filament from at least a first dope, a second dope and a third dope, said dopes being comprised of different polymers, and further being incapable of mixing, which device comprises at least a first guide plate having a first bore therethrough, a nozzle plate having a second bore therethrough which opens into a nozzle aperture, said first guide plate being disposed above said nozzle plate and forming therebetween at least a first passage for one of said dopes, said first and said second bores opening into said first passage, at least a first guide pin removably fitted within said first and said second bores, said first guide pin having a third bore which communicates with said second bore, said first guide pin having an exterior diameter which is less than the diameter of said second bore, thereby forming between said first guide pin and the wall of said second bore a second passage which communicates with said first passage, said third bore serving as a third passage for another of said dopes, said aperture being positioned adjacent to a common openings of said passages whereby when streams of said dopes are conducted into said spinning device they flow through the nozzle aperture in such a manner that each stream assumes a predetermined portion of the cross section of the compound filament produced, said device further including a second guide plate having a fourth bore therethrough, said second guide plate being disposed between said first guide plate and said nozzle plate and forming said first passage for said first dope between the second guide plate and the first guide plate and a fourth passage for said second dope between the second guide plate and the nozzle plate for a second guide pin having a fifth bore, said second guide pin being removably fitted within said fourth bore and said second bore, said first guide pin being removably fitted within said first bore and said fifth bore, said first guide pin having an outside diameter less than the diameter of said fifth bore thereby forming a fifth passage between said first guide pin and the wall of said fifth bore, said fifth passage communicating with said first passage, said second guide pin having an outside diameter less than the diameter of said second bore thereby forming said second passage, said second passage communicating with said fourth passage and said third bore serving as a sixth passage for said third dope.

2. A spinning device for producing a compound filament from a first dope, a second dope and a fluid, said dopes and fluid being incapable of mixing, which device comprises at least a first guide plate having a first bore therethrough, a nozzle plate having a second bore therethrough which opens into a nozzle aperture, said first guide plate being disposed above said nozzle plate and forming therebetween at least a first passage for one of said dopes, said first and said second bore opening into said first passage, at least a first guide pin removably fitted within said first and said second bores, said first guide pin having a third bore which communicates with said second bore, said first guide pin having an exterior diameter which is less than the diameter of said second bore thereby forming between said first guide pin and the wall of said second bore a second passage which communicates with said first passage, said third bore serving as a third passage for said fluid, said aperture being positioned adjacent to a common opening of said passages whereby when a stream of said first dope, a stream of said second dope, and a stream of said fiuid are conducted into said spinning device the streams flow through the nozzle aperture in such a manner that each stream assumes a predetermined portion of the cross section of the compound filament produced, said device further including a second guide plate having a fourth bore therethrough, said second guide plate being disposed between said first guide plate and said nozzle plate and forming said first passage for said first dope between the second guide plate and the first guide plate and a fourth passage for said second dope between the second guide plate and the nozzle plate, and a second guide pin having a fifth bore, said second guide pin being removably fitted within said fourth bore and said second bore, said first guide pin being removably fitted within said first bore and said fifth bore, said first guide pin having an outside diameter less than the diameter of said fifth bore thereby forming a fifth passage between said first guide pin and the wall of said fifth bore, said fifth passage communicating with said first passage, said second guide pin having an outside diameter less than the diameter of said second bore thereby forming said second passage, said second passage communicating with said fourth passage, and said third bore serving as a sixth passage for said fluid.

3. A spinning device as described in claim 1, wherein said first guide pin has an exit port which communicates with the third bore, said common opening being a chamber having an end remote from said exit port, said passages opening into said chamber, said aperture being at said end.

References Cited UNITED STATES PATENTS 2,589,870 3/1952 Sale et al. 18-85 2,834,046 5/1958 Hesselink 1885 XR 3,075,242 1/1963 Grafried 18-85 3,081,490 3/1963 Heynen et al. 1885 3,121,254 2/1964 Heynen et al 18-85 3,197,812 8/1965 Dietzach et a1. 1885 3,353,211 11/1967 Heijnis 1885 3,397,427 8/1968 Burls et al 1885 3,407,437 10/ 1968 Lenk 1885 FOREIGN PATENTS 1,365,873 3/ 1964 France. 1,102,339 3/1961 Germany.

355,247 8/ 1961 Switzerland.

J. SPENCE OVERHOLSER, Primary Examiner M. O. SUTTON, Assistant Examiner