US2385856A - Large rectangular spinneret - Google Patents

Description

Oct; 2, 1945. HAYEs I I 2,385,856

' LARGE RECTANGULAR SPINNERET Fil ed Oct. so, 1943 s Sheets-Sheet 1 Pall/Jaye; INVENTOR.

ATTORNEY I 3 Sheet s-Shee t 2 Oct. 2, 1945. P. J. HAYES LARGE RECTANGULAR SPINNERET v Filed Oct. 30, 1945 e S NVENTOR.

Arrow/[y 9 fizjgiyb p n/.111 V a 1 l 9a Oct. 2, 1945. PL J. HAYE LARGE RECTANGULAR SPINNERET Filed Oct. 30, 1943 I s Sheets-Sheet 3 [Hg INVENTOR.

A-T'TORNEY 'terfere with the how of enema on. 2, 1945 'zsssssc ir sv STAES PATENT, oFFiCI-I LARGE RECTANG Paul J. Hayes, Kenmore, N.

Nemours &

du Pont tie DeL, a corporation of D Application Uctoher 30, 1943, Serial N f 508,331 3. Claims. (01. 1s'-a) I This invention relates to the production of artificial filaments, andmore particularly it relates toa new 'and improved rectangular sninneret capable of extruding an her of filaments of uniform size and physical characteristics.

In the conventionally useci'apparatus for the spinning of artificial filaments, a metering pump is connected between a source 01 supply of a filament-fonning composition, and a. spinneret. The metering pump forces the filament-forming cornposltion through the sphineret at Such conventionally used circular spinnerets cannot be successfully desired to withstand the pressure without excessive flexing, orii'ices of a therein. If

forcing mea the latter Rectangular-shaped spinnerets have been disclosed heretofore but their use has favor in view of the great clificulty in eflectively sealing the several parts of the spinner-ct and in passing the illement-fonnlng-compcsition to the several orifices under the some pressure. The

approach chamber and seal exceedingly large nuin- Company, elaware SPINNERET 2., assignor to E; I. Wilmington,

rectangular spinnerets have been due to inability to provide the same with a suitable adaptor, or the perforated face plate thereto As a result of sharp changes in. direction of flow of the filament-forming composition through such previously known rectansular sninnerets, the composition failed to reach all of the orifices under the same oressure. vAs a, result, the filaments extruded through orifices varied so greatlyin denier as to he of little oommeroial value. I

It is therefore an object of this invention to provide an improved. rectangular spinneret havnot met with p difliculties encountered with previously known 121g 10,000 or more orifice and comp means for passing the filament-forming colticn to all of said orifices at substantially the same pressure.

Qther objects of the invention will appear hereinefter. The objects of this invention are accomplished, in general, by constructing a sninneret with a. rectangular face plate and an approach chamber having the shape of a pyramid, the base oi which is positioned near, and open to saicl face plate and one side of which is open to an inletport. It has been iound that a rectangular spinneret constructed in this manner will function to pass the filament-for composition to the face plate with a uniform pressure at all points thereof.

The details of the invention will be more clearly apparent by reference to the following detaileddescription when taken in connection accompanying illustrations, in which:

Fig. l is s. top plan View, with parts broken awey, of e. sninneret constructeriin accordance with the invention.

Fig. 2 is s sectional view taken along the line 22 of Fig. 1. r

Figs. 3, 4, 5, 6, l and 8 are sectional views taken along the lines M, M, 5-5,, B8, 5-1, and 88 respectively oi Fig. 2. I

Figs. 9, 9a and so are top plan, side eievationai and end elevational views r for keying the spinneret can to the adaptor.

IQ is a (liagrstic side elevational view, with parts shown in section, of a spinneret nositioned within asettlng bath. 1

Referring to the drawings, I! designates, generally a spinneret cap ll, ring reference. numeral a spinneret comprising adaptor 98,-

more orifices, side walls 21, and attachment flanges .29. The atwith' the respectively, of a key I clamped in contact tachment flanges 29 are clamped against the peripheral edge 3! of the adaptor 19, with the interpositioningtherebetween' of a rubber gasket 7 '33, one or more layers of a filter a perforatedfilter support 31.

T ese various parts are clamped together by fitting the flanged clamping ring 2! over the several parts as illustrated in Figs. 2 to 8, applying pressure thereto and sliding the fastening key 23 into the aligned grooves 35 and M, respectively in the clamping ring and adaptor.- (See Figs. 3 and d.) The fabric 35, and

perforated filter support 3'l may be provided with a flange 33 to reinforce the sidewalls 2"! of spinneret cap ll.

v".l'headaptor is has an inlet port 43 for the filamerit-forming composition in one end thereof, and the inside of th adaptor comprises anapproach'chambe'r 55 having the forimof a pyramid, the base of which is defined by the open edge iii of the adaptor, and one facecr side of which is entirely open to theinlet port 53-. The other three sides or faces ,of the pyramidal chamber 1 are defined by the triangular walls ti, &9 and El, and the apex of the pyramidal chamber is at In order that the requisite point 53 (see Fig. 1). number of orifices may be placed in the faceplate of the spinneret cap without flexing or bulging,

composition passing into the adaptor from the inlet port contacts a sloping bottom or hump 44 (see Fig. 2), which is adapted to deflect the spinning composition upwardly to insure adequate flow to the spinneret'openings directly above the inlet port. I s

large face area. It has been found that a spinneret constructed in accordance with the present invention may have a total face area of 5 or 6 or more square inches and may contain from 5,000 to. 30,000 or more orifices, and yet produce j filaments of uniform size and physical characteristics. By rea sonof the above described pyramidal shape of approach chamber and the-distributing hump, the filament-forming solution will pass to all of the many orifices with'substantially identical pressure and without formthe chamber having the sh ing cross-current eddies and voids within the.

spinneret. The spinneret of the present :invention may be used with any known spinning composition, for example, a spinning composition comprising viscose, cuprammonium cellulose,- cellulose acetate, a synthetic linear polyamide,'a

protein or the like.

Since it: is obvious that many changes and modifications can be made in the above described details without. departing from the nature and spirit of the invention, it is to be understood that the invention is not to be limited to the. i above described details except as set forthin the appended claims.

I claim: I

1. A spinneret of substantially rectangular outline comprising a substantially rectangular spinneret face plate containing orifices therein, a spinneret adaptor containing an approach a pe of a pyramid the base of which is open and oneside'ot which is con,- nectedto an inlet port, a hump being provided 'between' said inlet port and. said pyramid ior deflecting the incoming filament-forming composition. towards said spinneret orifice and means for connecting said spinneret face plate to said open base oisaid pyramidal chamber.

2; A spinneret ofsubstantially rectangular outline comprising at spinneret cap including a substantially rectangular spinneret face plate containing orifices therein, side walls integral with said face plate and attachment flanges pro:

The various parts of the spinneret may be quickly assembled as follows.- The spinneret cap H is placed within the rectangular opening of flanged clamping ring 2L The filter support 31 is then placed on the flanges 29 of the spinneret cap it and the filter cloth 35 is laid over the filter support 31. gasket 33 is then laid on the filter cloth. The adaptor I9 is then placed on the gasket 33, and sumcient force is exerted by mechanical or hydraulic means, forexample, by means of an as- ,sembly jig, between the clamping ring 2! and adaptor iii to thereby firmly compress the gasket 33 thus aligning grooves 39 and M. The key 23 is then slid into the aligned grooves. When the pressure is released, the compression ofthe yieldable gasket 33 is suflicient to hold the parts tightly with each other;

Referring to Fig. 10 of the drawings, the spin neret i5 is positioned in a setting bath contained in tank 50. The inlet port %3 of the spinneret I5 is fastened to a spinning composition conduit 52in any desired manner, such as by welding, soldering or a threaded fitting. The S-shaped conduit 52 may be provided with a suitable coupling 54 to permit ready removal of thespinneret from bath tank 56. I

By means of the present inventiomit is possible to spin a great number of filamentshaving a uniform size from a single spinneret having a jecting' outwardly from said side walls, a spinneret adaptor containing an approach chamber having the shape of a pyramid the'rectangular base of which is open and one triangular side of which is connected to an i let port, a hump being The rectangular yieldable outline comprising a provided between said inlet port and. said pyramid for deflecting and means for connecting said attachment flanges to said open rectangular opening of said pyramidal chamber.

3. A spinneret of substantially rectangular substantially rectangular spinneret face plate, side walls integral with said faceplate and attachment, flanges projecting outwardly from said side walls, a spinneret adaptor having a substantially rectangular open side, an inlet port in one end of said spinneret adaptor, means for fastensaid spinneret adaptor preach chamber in said adaptor between said I ing the attachment flanges to the open side of thereby forming an apinlet port and said spinneret face plate, the .approachchamber lower substantially triangular cross-section from the inlet port to the approximate center of the chamber broken by a distributing hump, and. having .a progressively shallower 'trapezoidal cross-section from theapproximate center of the chamber to the end thereof opposite said inlet port. I i

- PAULJQ HAYES.

the incoming filament-form ing composition towards said spinneret oriflces spinneret cap including a p having a progressively vshal-

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