US2624070A

US2624070A - Spinning or extrusion apparatus

Info

Publication number: US2624070A
Application number: US229821A
Authority: US
Inventors: Henry J Mcdermott
Original assignee: American Viscose Corp
Current assignee: Akzo Nobel UK PLC
Priority date: 1951-06-04
Filing date: 1951-06-04
Publication date: 1953-01-06
Anticipated expiration: 1970-01-06

Description

Jan. 6, 1953 H. J. M DERMOTT 2,624,070

SPINNING OR EXTRUSION APPKRATUS Filed June 4, 1951 INVENTOR.

HENRYJ MCDERMOTT A TTORNIY,

Patented Jan. 6, 1953 2,624,070 SPINNING OR EXTRUSION APPARATUS Henry J. McDermott, Collingdale, Pa., assignor to American Viscose Corporation, Wilmington, Del., a corporation of Delaware Application June 4, 1951, Serial No. 229,821

Claims. (Cl. 18-8) a liquid bath wherein the streams are converted into filaments, films, etc.

It is an object of the present invention to provide an adjustable mounting for a spinneret or extrusion plate whereby the spinneret or platemay be adjusted upwardly or downwardly within a container for a liquid spinning bath to providea wide range of immersion depths for such plate or spinneret. It is also an object to provide a spinneret mounting which may be moved to facilitate swinging of the spinneret to a position laterally of the container whereby liquid may be discharged from the spinneret into a drain disposed exteriorly of the container. Still another object is to provide means for adjusting the position, and controlling the movement, of structure disposed generally within a spinning bath container for supporting the spinneret and supplying a filmor filament-forming material thereto. ther object is to insulate a feed tube for an extrusion plate or spinneret (and the material passing thereto) from the transfer of heat to or from a liquid bath maintained at a substantially different temperature than the material passing through the tube. Other objects, features and advantages will be apparent from the following description of the invention and the drawing relating thereto in which Fig. 1 is an elevation partly in section of one embodiment of the invention;

Fig. 2 is an elevation partially in section of the apparatus of Fig. 1 with the movable portions thereof shown in another position;

Fig. 3 is a plan view of a swivel joint illustrated in Fig. 1; and

Fig. 4 is a fragmentary elevation partly in sectionof another embodiment.

In accordance with the present invention, ap-

paratus for extruding or spinning filamentarymaterial or other continuous products of small cross-section is provided in which an extrusion plate or spinneret is supported within a container for a coagulating liquid in which the plate or spinneret may be submerged.- The apparatus comprises a vertically adjustable structure disposed generally within the container for supporting the spinneret and for feeding film-forming material thereto. The supporting and feeding structure comprises a rigid feed member surrounded by a collapsible boot or sleeve of resilient A furmaterial with an upper portion thereof in sealed relationship with the member and a lower portion thereof in sealed relationship with the bottom of the container. The feed member extends through the bottom of the container and therebeyond a distance depending on the desired range of vertical adjustment. Optionally, the structure includes a swingable conduit for mounting the plate or spinneret to permit the swinging thereof to a position' outside the container during periods of dofiing.

In Figs. 1 to 3, a container 6 is provided having an overflow port I or other drainage means for maintaining a predetermined level of liquid within the container. A vertical tube 9 extends slidably through an aperture l 0 in the bottom of the container. The tube is vertically traversable and the position thereof with respect to the bottom of the container may be fixed by suitable means such as a set screw l I. The tube 9 terminates in a cap or head 12 having bifurcate portions l4, l5 as shown more clearly in Fig. 3. The head I2 is provided with a passageway l1 extending into the bifurcate portion l5 into intersecting relationship with an inwardly extending passageway 18. A screw l9 extends through the portion I' l substantially in alignment with the axis of passageway l8. An assembly comprising a fitting 2|, a coupling 22, a tube 23, an extrusion device such as the spinneret 24, and a coupling 25 for attaching the spinneret to the tube 23, is swingably supported on the head l2 with the fitting 2| held in clamped relationship between the bifurcate portions of the head. Portion I5 is recessed to receive a tubular boss 21 of the fitting 21. The fitting 2| is recessed at 28 to receive the end portion of the screw l9.

A collar 30 is provided upon the inner bottom surface of the container 6. Grooves 3i and 32 are provided on the head I2 and the collar 30, respectively, to facilitate the attachment of end portions of an accordion-like boot or sleeve 34 having annular beaded end portions which fit neatly around the head and the collar. The end portions of the boot may be secured by annular ture supported thereon from anydesired depth of spinneret such as from the position illustrated in Fig. 1 to the position illustrated in Fig. 2 wherein the tube 9 and assembly supported there on has been elevated to such an extent that the tube 23 and spinneret connected thereto may be pivoted to the position wherein the spinneret overhangs a receiver adapted to receive a liquid,

such as a waste trough or drain 38 or other means vention wherein the lower portion of the sleeve 34 is connected in sealed relationshi with the grooved periphery of a flanged collar 60. The fitting G is provided with a passageway 6| extending parallel to the central bore of the fitting through which the tube 9 extends in slidable relationship. A laterally extending passageway 62 communicates with the passageway SI and a suitable fitting 65 is provided in the terminus of the passageway 62 for attachment thereto of a tube 51 by a coupling 68. into the space enclosed by the sleeve 34 through a three-way valve 10 connected with tubes H and '12. In one position of the valve, a liquid or gas under pressure may be passed through tube II into the interior of the boot until a desired elevation of the tube -9 and spinneret is obtained. At another setting of the valve 10, the fluid contained in the sleeve 34 may be discharged into the return line I2 to storage means such as a reser- Fluid may-be introduced voir (not shown). If desired, the fluidv used may be air and the tube I2 adapted to discharge into the atmosphere. To obtain more positive control of the elevation and descent of the tube 9, a hydraulic fluid is preferably used. To secure the tube 9 at a desired position, means such as a set screw 14, may be screwed through the lower extension 64 of the fitting 60 into engagement with the tube 9.

When it is desired to pass thev film-forming material from a supply source at a difierent temperature than that maintained in the bath contained within the vessel 6, the boot prevents the transfer of heat between the liquid passing through the tube 9 and the liquid within the vessel. The region enclosed by the'sleeve is a particularly eflective barrier to heat transfer when the region enclosed thereby is filled with air or gas. To minimize heat transfer through the swinga'ble tube 23, a cover 11 of material having a. low heat transfer coeflicient may be placed around the tube 23 (Fig. 1). Such a cover is preferably liquid-impervious and resistant to chemical attack by materials contained within the bath. Some suitable materials are poly-- ethylene, polystyrene, a glass fabric wrapping coated with a'liquid-pervious material, fibrous materials formed from vinyl resins formed into a tube with the outer surface thereof rendered liquid-impervious by a coating on the outer surface thereof. As an alternative structure, the tube 23 may be provided with extra thick walls of any material having a low heat transfer coeflicient.

Apparatus for spinning or extruding continuous products in accordance with the present invention is highly economical of space since the structure for supporting a .spinneret may be housed substantially within a spinning bath chamber. The space outside of the spinning chamber consequently is not cluttered and permits freer movement of personnel and closer spacing of spinning units. As a further advantage, the spinneret or extrusion plate is easily and accurately adjusted in accordance with the desired depth of immersion and the arrangement herein described has the further advantage of permitting the passage of extrudable liquid through the duct system connected with the spinneret without substantial heat transfer between such liquid and the liquid of the spinning bath.

The present invention may be used for forming films, filaments, and the like by means of a liquidcoagulating bath from viscose, cuprammonium cellulose, cellulose esters, such as cellulose acetate, synthetic resins, such as nylon, vinyl polymers, such as polymers and copolymers of vinyl chloride, acrylonitrile, vinylidene chloride, vinyl acetate, vinyl pyridine, etc.

While preferred embodiments of the invention have been shown and described, it is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

1. Apparatus for converting a film-forming material into films, filaments, and the like comprising a container having an aperture in the bottom wall thereof, an extrusion plate, means for supplying a film-forming material to the extrusion plate comprising duct means extending through the aperture upwardly into the container and coupling means for connecting the extrusion plate in communication with the duct means, an axially collapsible and expansible sleeve of a flexible liquid-impervious material surrounding a portion of the duct means extending above the aperture, means for connecting the upper end of said sleeve with the duct means in sealed relationship, and means for connecting the lower end of the sleeve in sealed relationship with a surface of the container surrounding the aperture.

2. Apparatus for converting, a film-forming material into films, filaments, and the like comprising a. container having an aperture through the bottom thereof, an extrusion plate, means for supplying a film-forming material to the extrusion plate comprising a straight tube extending vertically through the aperture into the container and means for connecting the extrusion plate in communication with the passageway of the tube, an axially collapsible and expansible sleeve of a flexible liquid-impervious material surrounding a portion of the tube extending above the aperture, means for connecting the upper portion of said sleeve with the tube in sealed relationship, and means for connecting the lower portion of the sleeve in sealed relationship with a surface of the container surrounding the I aperture.

3. Apparatus for converting a film-forrmng material into films, filaments, and the like com prising a container having an aperture through the bottom wall thereof; an extrusion plate; means for supplying the film-forming material to the extrusion plate comprising a straight tube extending through the aperture upwardly within the container, a duct member pivotably connected with the upper end of the tube, said tube being traversable to an elevated position; means for coupling the extrusion plate to a portion of the duct member in communication with its passageway, said portion being remotely spaced from the end of the member connected with the tube; an axially collapsible and expansible sleeve of a liquid-impervious material surrounding a portion of the tube extending above the aperture; means the bottom thereof, a spinneret, a straight tube extending through the aperture into the container, a second tube, a swivel joint for connecting the first-named tube and the second tube with the passageways thereof in communication, means for connecting the spinneret to the end of the second tube remote from said joint, said first tube being traversable to an elevated position wherein the second tube is swingable with respect thereto to carry the spinneret to a position which is laterally offset from the container, an axially collapsible and expansible sleeve of flexible liquidimpervious material surrounding a portion of the first-named tube extending above the aperture, means for connecting the upper end of said sleeve, with the upper end of said surrounded portion of the first-named tube in sealed relationship, means for connecting the lower end of the sleeve in sealed relationship with a surface of the container surrounding the aperture.

5. Apparatus as defined in claim 4 comprising a receiver mounted exteriorly of the container and disposed below the position occupied by the spinneret laterally of the container, said receiver adapted to receive and hold a liquid material.

6. Apparatus for converting a film-forming material into films, filaments, and the like comprising a container having an aperture through the bottom wall thereof, an extrusion plate, means for supplying the film-forming material to the extrusion plate comprising a straight tube extending through the aperture upwardly within the container and means for connecting the extrusion plate in communication with the passageway of the tube, an axially collapsible and expansible sleeve of a flexible liquid-impervious material surrounding a portion of the tube exset screw means associated with the guide means for engaging the peripheral surface of the tube.

8. Apparatus as defined in claim 6 comprising means for adjustably moving the tube in the guide means.

9. Apparatus for converting a film-forming material intofilms. filaments, and the like comprising a container having an aperture in the bottom thereof, an extrusion plate, means for supplying the film-forming material to the extrusion plate comprising a straight tube extending through the aperture up wardly within the container, an axially collapsible and expansible sleeve of a flexible liquid-impervious material surrounding a portion of the tube extending above the aperture, means 'for connecting the upper end of said sleeve withthe tube in sealed relationship, a fitting fastened in the aperture in fluid-tight relationship and having a bore therethrough complementary to the exterior surface of the tube, means for connecting the lower end of the sleeve in sealed relationship with a surface of the fitting extending inwardly of the container and surrounding the bore thereof, a passageway through said fitting terminating in the region enclosed by the sleeve, means comprising a conduit connected with the passageway for supplying a liquid to the interior of the sleeve, and valve means connected with the conduit for controlling the supply and the discharge of liquid to and from the sleeve.

10. Apparatus for converting a film-forminga portion of the tube extending above the aperture, means for connecting the upper end of said sleeve with the tube in sealed relationship, means for connecting the lower end of the sleeve in sealed relationship with a surface of the container surrounding the aperture, means for forcing a fluid into the region enclosed by the sleeve and surrounding the tube. means for conducting fluid from said region, and means for selectively controlling the fluid introducing means and the fluid discharging means.

HENRY J. McDERMO'I'I.

No references cited.