US2658254A - Rayon spinning machinery - Google Patents

Description

1953 J. H. GIVENS ET AL 2,653,254

RAYON SPINNING MACHINERY Filed Feb. 1, 1950 i m 1 I I I" I I II I I l I O --k G) Ll.

J l\ INVENTORS JOHN HARRISON GIVENS LESLIE ROSE ERIC JOHN WHYTE BY THEIR ATTORNEYS Patented Nov. 10, 1953 UNlTED PATENT OFFICE RAYON SPINNING MACHINERY Jdhii if. ferrets, Miiden, and, Leslie Rose and Eii'f J, Why 'e, q v ryyl j d a 'iit s, i i Courtiulds Limited," London, England, a} British Application February 1, 1950, Serial No. 141,712

Claixii fifierity, application Great Britain March 14, 1949 I .This invention relates to rayon spinning macli'i'nry. p I I the premise-eh of artificial threads by the b'oir spihiiifig pfiiss, a thread-farming stilu'ti'on such as viseese is eiitfud d through fa; jet into a coagulating me ium and the 'fil'aiiient's; so formed are withdrawn by means for godets and are then passed by means of a ream-eatin guideinto a rotating spinning; be)? in 'which a take ofthread is forme The geaets hitherto employed have usually'be'en corrugated so that the ridges and the ereeves between successive ridges have approximately the same'tv'idth; Withhigh spinnin speeds, that is to say speeds of the order of 90 metres per minute or "more, and using conventional godets, it is not always easy for the opera tive toset-up thethre'ad, that isto pass the thread from the go'det into the spinning box via the re; cip'rocating funnel dr oftlier guideused to lay the thread in the beat. The cohesion between the thread and the'convlefitional godet-athighspeeds is usually so great that in the short time interval available betweeri' ta ing the thread from the g'ode't and the 'initia Idfi'of'the pull of th box to start the spinning steeess the thread licks under the godetand th atteniptee settmg' u fails Theeb 'eet-of the-present 'inventionis ta pm; vide an improved design of godet or equivalent thread take-spam del itry device w'mehf'acili tates the setting upo'f the threadat high speeds.

We have found that by suitably reducing the width of the-thread-sdpporting surfaces and also by increasing the distance separating such sur faces; a gddet or equivalent device is obtained which permits easy setting up atspeeds of the order of 100 metresper minuteor higher, for example up to-12'5'ni"- tes' petmmute. r

Accordingly th'e'p siitinvehtionconsists of a rotatablethread' takeupanddelivery device cofnf prising at least twenty thread-supporting bar's arranged substantially uniformly around and equidistant-from the-centre of rotation of the device; the thread-supporting surface of each bar being not greater than 0.1 of an inch in width at'the point at whi'lrthe thread leaves the device and the pitch of the-bars; that is the distance between the centres of successive bars, being from 0.5 of an inch to 2 inches.

The take-up and-deliverydevice acddrdiii'g to the invention is preferably a godet but the device may be formed by a number of circumferential bars carried by a spider mounted on the driving shaft of the device.

The bars of the device are preferably of uniform width along their whole length but if de- 3 Claims. (Giza-71. 5)

, 2 g si e therm e w d r t a -1, df ah. nchgt h ke-u .en t. P d h the w h. s, #2:, 111 9 to qwt. 0- f n. i at h d schar e point. The number of bars at the take-up end may also be difierent from the number of bars at th dis herg'e end. v f I The' inven'tio'n also includes a pretes tel-the p o uctions: rayon thread in cake term" by ex tradi a threa -turning 'sblutieii thrdiigh a jet into a oagu aht and passing the r sulting filaments to such a thread take-11 5 andneh'very device and then we reta'tihg'spinmhg be at a speed of atleast 90 etres per' minute byniea'fis 6f areeiprocatmg funnel. y

e 'godet at equivalent takeilti aha delivery device according to' the izivehtien efie'ets sub: s'tanti'a'l' reduction in'the rcree necessary to ca se the wet thread to mate its serrate. Thdviee Inay therefdre a so pe used infthe spihniiigfir thick cakes of I ghtdehier marneht threads fer example of filament/60 denier threads, tli out the pr mature teakdewn whieh often "i curs when the ee t imga p 11 ;rrorh the r atirig .7 n wh l spinning 60 filament/60 denier threads and using a conventional godet the collecting period for thecake is usually of theorderof 1 5 to ,1 6 h0urs whereasusiing g'eiaets according to the iiivfhti'on, collecting times of s etrs'ermert may" be used.

The thread take-jun andd'elivery device at:

cording to the inventioiifiiay be used withhd vantage wit 'the' spih ihg'rhaehihes d e d in" the speetfiea iehs; or; eepehtiing app 10a ons SerialjNo'S'. 255,388gfi efclj ,NoYfember s; 1951, and 263,563,jfiled eee hjer 27,1951, now rateiitsndsz 253;,69'3'antrzgssasee, tespeet1ve1y. I j rhepres nt invention is illustrated by war 6: example in the accompanying diagrammatic drawingsintvhich A I f 1. Fi u e '1 IM "w, ;'b iin a i incorporating go'det according toLthein'veriti; 'F'i'gnre 2' isfa nd view of hf ged eejefmihe to' thefinvention ss -own in"Figure;1", and v 'F1 ure 3; isfa plamviewof, p'airticnly o'f thezodet sho nin'liigureZ,jona'largr scale.

Referring "to igure, l

rscosef is r extruded Referring to Figures 2 and 3, the godet 6 is provided with a conventional flange 9 and has thirty-six circumferential bars l separated by thirty-six grooves H. In one specific form of godet, the width of each bar l0 at its tip is 0.05 inch, the height of each bar is approximately /8 inch and the overall diameter of the godet is 6% inches; the pitch of the bars in this specific godet is 0.59 inch and the width of the grooves H is 0.54 inch. The godet is conveniently about 3 inches long.

The application of this specific form of godet to high speed spinning of viscose and to the spinning of light denier filament threads is illustrated in the following examples. Percentages are by weight.

Example 1 Viscose, containing 7.5 per cent of cellulose and 6.0 per cent of caustic soda, and aged to a salt point of 5.5, was extruded through a jet having 18 holes each of 3 thousandths of an inch diameter into a coagulant bath at 60 centigrade to form a '75 denier thread. The coagulant bath contained per cent of sulphuric acid, 19 per cent of sodium sulphate and 1 per cent of zinc sulphate. After passing through the bath for about 10 inches, the thread was withdrawn from the bath at a speed of 80 metres per minute by means of a godet of conventional design. The thread was lapped round the conventional godet two and a half times and was then passed at a speed of 100 metres per minute to the godet described above having 36 teeth & of an inch wide, the thread being lapped round this godet also two and a half times. The thread was then collected by means of a reciprocating glass funnel in a box of 6% inches diameter and rotating at 7.000 revolutions per minute. When spinning under these conditions, it was found that with the godet according to the invention a skilled operative experienced no difficulty in setting up the thread. whereas when the godet according to the invention was replaced by a conventional godet, the same operative experienced considerable difllculty in setting up and on an average only succeeded in settin up once in every four attempts.

Example 2 Viscose containing 7.5 per cent of cellulose, 6.0 per cent of caustic soda and aged to a salt point of 5.5, was extruded through a, jet having 60 holes, each having a diameter of 2 /2 thousandths of an inch, into a coagulating bath at 60 centigrade containing 9 per cent of sulphuric acid, 20 per cent of sodium sulphate and 1 per cent of zinc sulphate. After passing through the bath for a distance of 4 inches, the thread was withdrawn at a speed of 50 metres per minute by means of a conventional godet and passed at a speed of 62 metres per minute to a second godet as described above having a diameter of 6% inches and provided with 36 teeth each & of an inch wide. The thread, of 60 denier, was passed from the second godet by means of a reciprocating funnel 9 inches long having four internal constrictions each 0.12 inch in diameter, and an orifice of 0.10 inch in diameter to a rotating centrifugal box 6 inches in diameter and rotating at 7.000 revolutions per minute. Under these conditions. spinning breakdown occurred after 19 V hours. The cake so produced was suiliciently thick in its walls to stand up to the pressure of a standard cake-washing machine.

A similar experiment in which the godet according to the invention was replaced by one of conventional design broke down by reason of insuilicient pull at the godet after 15% hours. The cake walls were not sufllciently thick to ensure perfect pressure washing and a cake of inferior quality was obtained.

The marked advantage in using the godet according to the invention may be judged by the following results obtained on a machine having 10 spinning ends similar to those described in Example 2, the machine being run continuously for one month. 1

Percentage failures in the cake washing process With the conventional second godet 15 With the novel second godet 0.5

During this run, spinning times of 18 hours were used with the novel godet, without any premature breakdown occurring, while, with the conventional godet, only 45 per cent of the cakes achieved the normal 16 hours spinning time. With the other 55 per cent, spinning broke down at times varying from 14-16 hours.

The godet used in the above examples may be replaced by a godet having an overall diameter of 7 inches and having 40 bars on its circumference, each bar being 0.05 inch in width and the pitch of the bars being 0.55 inch.

What we claim is:

1. A godet for high speed spinning into s. rotating spinning box having thirty-six to forty thread-supporting bars arranged substantially uniformly around and equidistant from the centre of rotation of the godet, the width of the thread-supporting surface of each bar being 0.05 of an inch and the pitch of the bars being from about 0.55 to about 0.59 inch, whereby licking under of the yarn during settin up is avoided.

2. A godet for high speed spinning into a rotating spinning box having forty thread-supporting bars arranged substantially uniformly around and equidistant from the centre of rotation of the godet. the width of the thread-supporting surface of each bar being 0.05 of an inch and the pitch of the bars being .055 inch, whereby licking under of the yarn during setting up is avoided.

3. A godet for high speed spinning into a rotating spinning box, having thirty-six threadsupporting bars arranged substantially uniformly around and equidistant from the centre of rotation of the godet, the width of the thread-supporting surface of each bar being 0.05 of an inch and the pitch of the bars being about 0.59 inch. whereby licking under of the yarn during setting up is avoided.

J. H. GIVENS. LESLIE ROSE. ERIC J. WHYTE.

References Cited in the flle of this patent UNITED STATES PATENTS Number Name Date 2,259,202 Cooper Oct. 14, 1941

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