US2940122A - Melt spinning apparatus with pivotally mounted blowbox - Google Patents

Description

June 14, 1960 B. COLLAT 2,940,122

MELT SPINNING APPARATUS WITH PIVOTALLY MOUNTED BLOWBOX Filed Nov. 13, 1955 4 Sheets-Sheet 1 FIG. 1.

INVENTOR LEWIS BYCK COLLAT BY axymiw ATTORNEY June 14, 1960 L. B. COLLAT 2,940,122

MELT SPINNING APPARATUS WITH PIVOTALLY MOUNTED BLOWBOX Filed Nov. 13. 1953 4 Sheets-Sheet 2 FIGZ I VIIIIIIIIIIIIIIIIIIIIII J v 1 r m gr \I INVENTOR aLEWIS BYCK COLLAT BY Q xfimmm ATTORNEY L. B. COLLAT June 14, 1960 MELT SPINNING APPARATUS WITHrPIVOTALLY MOUNTED BLOWBOX Filed Nov. 13. 1953 4 Sheets-Sheet 3 FIG. 5.

INVENTOR LEWIS BYCK COLLAT ,wwdvaiw ATTORNEY L. B. COLLA T June 14, 1960 MELT SPINNING APPARATUS WITH PIVOTALLY MOUNTED BLOWBOX 4 Sheets-Sheet 4 Filed Nov. 13. 1953 INVENTOR LEWIS BYCK COLLAT M F. kwm

ATTORNEY United States Patent MELT SPINNING APPARATUS WITH PIVOTALLY MOUNTED BLOWBOX Lewis Byek Collat, Wilmington, Del., assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Nov. 13, 1953, Ser. No. 391,836

1 Claim. (Cl. 18-8) This invention relates to the spinning of filaments. More particularly, it relates to multi-end spinning and to means for keeping filaments that are running in a group in their group positions, thereby preventing filaments running in one group from straying over and into filaments running in another group.

Usually in the spinning of filaments from synthetic materials such as cellulose esters, vinyl polymers, polyamides and polyesters, a plurality of filaments coming from a single spinneret are wound as a single yarn end. For more economic production, it is desirable to spin more than one end of yarn from each spinneret. Therefore, spinnerets have been designed that contain a number of sections, each section having a-plurality of orifices. The filaments formed from one of these sections are kept running together in a group and that group is formed into a bundle. Each bundle coming from its respective section is wound into a separate yarn package. It is possible to have each of the yarn packages formed on individually driven spindles or formed through the driving of a single spindle.

Because of their close proximity and because of minor disturbances in the cell, filaments from one group tend to stray to another group. Prevention of this straying has,

been a serious problem in multi-end spinning procedures. Further, in a transfer of filaments-from a plurality of yarn bundles, off-standard yarn results when straying has occurred. Uniform denier and uniform filament count are desired. Since the multi-end spinning operation is conducted at a high rate of speed, the straying can produce substantial quantities of the off-standard yarn.

Accordingly, it is an object of this invention to provide means'for preventing the straying. A further object is the passing of a group of filaments through a spinneret cell a continuous manner and Winding up the group of filaments without variation in filament count or denier. A still further object is the handling of several groups of filaments in such. a manner that the identity of each group is maintained throughout the spinning and winding operations.

The objectives of this invention are accomplished by the provision of a system of bafiies in a cell or chimney assembly. The 'bafiles constitute an integral part of the filament hardening chimney or cell. String-up of the filamentsrunning from the spinneret head to a collecting means is accomplished while the cell or chimney is in an open position. After the stringing-up, the assembly is closed and the desired partition is accomplished. During this spinning operation a plurality of yarn bundles is kept running in a continuous manner without change in'the identity of any of the yarn bundles.

In the figures:

Figure 1, an elevation in perspective, shows one form of the apparatus of this invention, the apparatus being in an open position;

Figure 2 is a sectional side elevation with one of the Patented June 14, 1960 ICC chimney wings removed, showing the contour of the bafies.

Figure 3 is an elevation showing the compartments;

Figure 4, a plan view, shows one form of a support for the unit of the apparatus containing the battles; and

Figure 5, also a plan view, shows another form of support for this bathe-containing section.

In Figure l the spinneret head 1 contains a plurality of sections 2 each of which has a plurality of orifices. From these sections a plurality of filaments is formed and each section gives rise to a filament bundle 3. These fila-g ment bundles 3 are passed downwardly through the spinbeams 11 as shown in Figure '2.

prevent the setting up of eddy currents.

ning cell or chimney assembly 4, shown in closed position in Figure 3, to a winding up device (not shown). The assembly is made up of two sections, plenum chamber 5 and baflle unit 38. For convenience, the invention is described in respect to a cross-flow chimney such as that as by baflles 10 and out into the atmosphere or into a colleche supported by tion chamber. The plenum chamber can The bafiies 10, in perspective, can be seen in Figure 1. These bafiles are located in between the two chimney wings 12 which enclose the area of operation and which Steady state operation is obtained through the use of these wings and The number of bafiles 10 that will be used will depend upon the number of filament bundles that are being spun. Each of the four sections 13 that is formed usually has no more space than exists between the sections in the spinneret containing the groups of orifices. That is, the distance from battle to bafile is about the same as the distance between the center lines of the groups of orifices which go to make up the separate filament bundles or be- 3 tween the center lines of adjacent filament bundles. The baifies do not operate on these center lines but are displaced into the spaces between these groups. The bafiles are spaced apart in increments to fit into the spacings between the filament bundles. Preferably, the spacings of the bafiles will equal the spacings of the filament bundles.

The baflles it) may have outward protuberances 14 at the top portion and may have indentations 15 at the bottom portion as required. A bafile where the outward protuberance at the top is simply the projection formed by a slant line inclined at about 3 to the vertical has operated successfully.

As shown in Figure 2, the path of a filament in its downward travel through the chimney cell corresponds" approximately to the path designated by dotted line 16. The medium that is being blown into the plenum chamber 5 and through the screen 7 tends to blow the fila-' ments away from the screen. The bowing efiect prior to complete string-up is greater at the bottom of the device. Further, as shown in Figure 1, each of the separate filament bundles 3 are converged and may be passed over the finish roller 17 where the installation includes one.

This roller is usually driven in the direction of the travelling filaments and the finish is applied to the. The fila PQS tion.

r .r 5 re turther. a y iron; the screen 7 atthe bottom than at top where the outward protuberances are. Since bundles into the proper guide throat.

stringing up is usually accomplished before the chimney assemblyis closed, the filaments are bowed out some- ,what as shown by path 16 except that they are also bowed out considerably in the lower :part of the'cell as V well. With the contour of the bafiies 1,0 as shown, the

unit containingihe batfies can be swung into position without touching the filaments in the upper zone and with very little contactin the lower zone. bafileprotuberances at the top enter the spaces between the filament bundles just below the extruding means and thus ensure the proper partitioning of the filament. bundles as the battle unit is Pushed inand seated-g Al though the bowing effect and unsteadincss inthe-fil f fint undles caus y t e string-up may have pr duced some interminglingbf fil men s from adjace t bundles in. the ower zone, a t e baffies are pushed in e e filaments are forc d into their p oper c mp rtments y a sort of rolling contact'withthe hafile edges. The inward cut 15 at' the bottom are adjusted to conformto the contour. V of the finish roller 17. "Ibis roller may be recessed or placed further away from unit38, but it is usually desirablejo have it approximately vertically below the center line of the spinneret The converged filament" bundles leaving the chimney assembly are passed to the wind-up devi es r r, V

As shown in the drawings, particularly in Figures 4 and :5, the unit 38 containing the battles is pivotally mounted so that the unit maybe swung into orout When the units and Y38 are in the closed The minor 4 tion is to converge the filament bundles and to pass the A similar set of convergence guides 35 and 36 can be located .at the lower- .most part of the assembly to insure that the bundles running of the filaments through-the chimney assembly and without any interchange of filaments among the plurality of'bundles. This is'a distinct advantage, because in doifing and starting operations, in the absence of the bafiies of this invention, considerable disturbance occurs in the filament bundle lines in the chimney. Previously position, the surfaces 18 are in close contacting position.

r The support shown in gu e -4,is aslide' bar 9 t mnt d on the beam 9. COQPQrating with the slide bar 19 are r members 20 each appropriately mounted on a chimney.

ins 2- 1 a correspondi g pos t onbn'un t 5 thr ugh beaml9, are mounted polished rods 21 which cooperate ith hin s 23.- ,et'th .ui o rwiuts. a p r f sli e efiected by this invention is complete and correct. *Upon ar re r-conne ted Jto one of the himn y wings 12,

"through brackets 22 and members 20.' Pins; 39 'connecb' ingthese members and brackets pc'rtni jpivoting- At'theends ofthe slide bars 19 are stops 24. The unit is pulled straight out until the members"20 contact the-stops 24,

a At this point the chimney assembly 38 clears the rods '21 andmay be. swung intothe open position as shown by the dottedlines 25 in Figure 4. The arcthrough which the un t maybe swu g is 90 or mo a e uiredu Anothcrtype o support is sh wn in i u 1 In this modification, the polished rod l fi ismounted on the beam 9. Onthis rod is a slide bushing 27 to which'is attached bracket 28 fixed at its other extremity to a chimney wing 12. bracket pivots about point 29 on the bushing.

. Mounted on "the bracket'is roller 30 which holds the wing parallel while the wing is being opened. The,slid

ing'bu'shingcan be movedforward or backwards, andin the forward movement the unit containing roller 39 moves to .a position against stop 40 which position is.

shownby dotted lines 31. in this position, roller 36 has cleared the end of the bar 26 and the wing can be swung into an open position without any appreciable play. This oftherolle'r' 30 on rod 26. 7 V a s As shown in Figures 1 and *2 there can'be mounted between the battles toward the lower end of the chimney.

unit 38 guide pins 33 and fingers 34w These guide pins and fingers are usually in the form of a V and their tunemodification permits the disposal of the two left hand sliding bars 21.. Mountedon the bushing 27 is' an adjustable stop 3 2.which can be used to adjust the pressure such disturbance ledto considerable straying of filaments. This operation eliminates the disturbance, and high standard yarn is produced at a high rate of speed.

The apparatus of this invention has been shown in.

use with a single spinneret: producing a multiplicity of filamentbundles. It may also be used in apparatus .comprising a pluralityof closely spaced spinnerets producing a plurality of yarn bundles using a single large hardening cell. In either case the bafiles are readily removed .dur-

1 ing suchnecessary operations as installation of spinnerets,

wiping, threading-up and maintenance. The self-partiti'oni g eflect insures a proper division'of the'filaments into th desired plurality of bundles. In connection with a single spinneret, this automatic-partitioning is most important and desirable because of the close spacings and because the filaments are traveling over: long .dis-" tances in close proximity through a'zone thronghwhich a gaseous medium is movingrapidly. Separation of' filament bundles hand is eliminated and the separation separation there is ,Iio possibility Qf straying while :the

unit is in closed positiong a departure from the above description which con forms to the present inventionis intended to be included within the scopeof the claim. V I claim: r

. A spinning apparatus for lthe'spinning'of filament bundles comprising a spinneren'a spinningf cell adjacent thereto and through which the filaments from the spin-j ne ret'pass, aplenumchamber for directing vapor across the path of thefilaments inthe. said cell, and a unit pivotally mounted to the plenum chamber for horizontal movement, said unit containing a bafiie'positioned substantially parallel to the. filaments and extending sub- 'stantially'the full length ofthe said cell, dividing the cell into chambers,

, References :Cited inthe file of this patent UNITED STATES PATENTS 1,427,014 Pazsiczky Aug. 22, 1922 1,942,540 Dreyfus et al. .Jan. 9, 1934 1,959,443 Payne et al May 22, 1934 1,992,609 Dreyfus Feb. 26, 1935 2,017,113 Whitehead Oct. 15, 1935 2,273,105 Heckert Feb.-l7,'l942 2,303,338 Dreyfus et'al. 'Dec; l, 1942 OTHER REFERENCES Sen'No. 362,260, Egger et 1. (A.P.C.), published A r.

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