US1871704A - Apparatus for the production of strong filaments of artificial silk by the stretch spinning process - Google Patents

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. H. KEMPE v 1,871,704 APPARATUS FOR THE PRODUCTION OF} STRQNG'FILAMENTS OF HE STRETCH SPINNING PROCESS ARTIFICIAL SILK BY T Filed July 29, 1927 INVENTOR, 2 Hubert- Kemp! far ATTORNEY,

Patented Aug. 16, 1932 UNITED PATENT TF- nunnn'r xnmrrgor BARME GERMANY, assraivon To AMERICAN :BEIV'IBER conno- RATION, or NEW YORK, 1v. 'Y.

nnmmn'rus roa "run rnonUcIiIon or srRoNe FILAMENTS or ARTIFICIAL 'sI ix BY rHEs'rRnrcH SPINNING rno'cnss 1 Application filed 3111y 29,"192'7, Serial No.

' I The present invention relates to i'mprovements in processes for the production of strong filaments of artificial silk by the stretch spinning process, and particularly by the cupro-ammonium stretch spinning process, as well as to apparatus "for carrying out the saidprocess. A

,In the production of staplefilaments it has been suggested to divide larger groups of filaments into smallergroups, but these latter were not'afterwards combined'so'as to form a single-thick filament. It "has'also been suggested to force-groups of filaments through numerous nozzles into a tube through which precipitating liquid flowed. For example, 64 nozzle plates were employed, some of which were disposed adjacent to each other and some were arranged over-each other around a tube and 14,000 filaments were produced si- 'multaneously' In this case, however, the

precipitating liquid flowed in turn to the various groups of nozzle-plates arranged over each other, so that owingto variations in the precipitating liquid during the spinning process, the lower filaments were coagulated to a diflerentextent fromthe'upper filaments. Moreover, the groupsof nozzles were. disposed so closely to each otherjth'at-the stickingtogether ofthe separatefilaments was inevitable; The known process therefore, did not produce strong filaments of artificial silk, but on the otherfhand produced a rope of filamentswhich consisted of separate, filaments entangled together. Presumably, this rope of filaments was to'serve as raw material for the production of staple filaments.

In' contrast to the previous processes, strong filaments of artificial silk are obtained by the present process, in which the separate filaments are prevented from sticking together and lie next to one another without being entangled as in the production of thinner filaments. In accordance with the invention, strong filaments of artificial silk are produced by forming ina spinning apparatus two or more groups of filaments which'are treated and kept separated from each other until the filaments have lost their tackiness, after" which the groups of filaments are united to,

treated -may be employed in the 2093231, and in Germany August. 5, 1926.?

form a single filament and latter coniducted out. of the spinning apparatus.

This process has the advantage that separate groups of filaments need not be made stronger than previously, so that a uniform -5 coagulation ofth'e separate filaments is en sured, whilst if too large a number ofindi vidual filaments were joined to form a single group of filaments, the filaments thus";pro,--"

*duced would not be uniform, I

The process in accordance with the .inven-f tion may be carried out in iva'riousw-kinds of apparatus so long asthe spinnerettes are arranged to produce separate groups of filamentswhich are kept separate from "each other while passing'through a funnel and are ultimately combined together before being delivered from the apparatus. .As many funnels as groups of filaments are being spinning apparatus and in which case the funnels lead to a common outlet tube. Also, instead of employing funnels disposed inside anouter: casing, this latter may itself have the shape o-f'a funnel and the ordinary funnels omitted: In this, formyof construction, the casings are provided with a common outlet. for the filaments. other shapes may also be employed where desirable. I Various forms :o-fapparatus, are illustrated diagrammatically by' way of example 'for carrying out the invention, I and in which {Figure 1 :showsan elevation of-a spinning.

apparatus embodying the invention. 1Figure2 is a plan view of the device Shown in Figure 1. I 3 Figures '3 and 4 are elevation and plan views, respectively, of a modified form of the improved .spinning apparatus, 7 Figures 5 and 6. are, similar views ofa further modified form of the improved spinning apparatusf l Referring to Figure 1, two spinnerettes a .and 0 through which the spinning solution may "be forced in the manner ordinarily used-in the production ofii 7 manufacturing artificialthread by-the cuproammonia stretch spinning process, are provided at, the top of the ca'singb.

Suitable vessels of I laments" while Within we the casing b is provided a split funnel made up of two separate inlet sections and 0 with a common outlet d. The precipitating liquid is admitted through the tube e. The groups of filaments f and i are dlscharged separately from the spinnerettes a and a? and are kept separate as .they pass.

through thefunnels o and 0 up to the point at which the funnelsvmeet the com:

mon outlet tube d. In the latter the groups of filaments are united and are conducted in this condition out of the apparatus. ,A single spinnerette may be employed instead of using two separate-spinnerettes so long as the holes in the spinnerette are divided up into separatejgroups, the number of which latter corresponds to the number of groups of filaments tobe produced and may be varied as desired.

' In this construction the initial separation ofthe'separate groups of filaments f and p 1 f is fully-ensuredisince each group of fila- V ments' is conducted-through its own parjticular funnel. The .1 precipitating liquid 'may also .be'admitted throughanumber of wtubes a'nd these," latter may if desired 'be i provided atthe upper "edges of the tunnels,

provided the precipitating liquidis admitted without any" considerable amount of turbuf lencem 1. M f Figures sand-'4 illustrate three separate funnel-shaped casings 6 b and '6 The casings are provided with a common outlet tube cl. Thecasings b b b are provided with spinnercttes a (2 ,11 respectively. The precipitating liquid may be admitted to the apparatus in any suitable manner. Tubes 6 6 e may be employed if desired by means of whichprecipitating liquid may be admitted separately to the vessels'bl, b and 6 As illustrated in Figures?) and 6 an inlet-tube e may be disposed in knownmanner at -the junction of the tunnels and outlets. 9 3 9 9 3 maybe disposed at the top of the vessels b 72 b respectively. In this latter case the precipitating liquid flows first inthe opposite direction to the movement of the groups of filaments and in'the I same direction fromthe point at which the the apparatus de- I for the production :of 7

vice being mounted at the top of the precipitating apparatus, and a plurality of funnels disposed beneath said extrusion device to receive said groupsoffilaments, said funnels having a common outlet for vthe combined groups of filaments. a

2. .Anapparatus for the production of thread of artificial silk, comprising a casing,

a plurality of extrusion devices mounted at the top ofpsaid casing, and each provided I with a. number of apertures 'for' forming ,a

plurality of individual filiments arranged in separate groups, an inlet tubefor supplying precipitating liquidto said casing, and a plurality of funnels disposed within said casing to receive said. groups of filaments,

said. funnels having a common outlet for.

precipitating liquid and for the combined groupsv of filaments.

3. Anartificial silk stretch spinning apparatus for producing threads, comprising a precipitating apparatus, a plurality of spinnerettes arranged to provide a pluralityof individual filaments arranged in separate groups, alplurality of funnels, eachof which 'is disposed toz-receive one of said groups of filaments, said funnels being provided with a common outlet tube for precipitating liquid and for the united groups of filaments, and

, an inlet tube adapted to supply precipitating liquid to each of said funnels. I

" 4. An artificial'silk stretch spinning apparatus for the production of threads, comprising a precipitating apparatus, a plurality of spinnerettes having separate apertures adapted to form av plurality ofindividual filaments arrangedin separate groups, 7

a plurality of funnels each disposed to, receive one of said groups of filaments and providedwith a common outlet tube for precipitating liquid and for the united groups of filaments, an inlet tube for supplying precipitating liquid positioned at the junction of said tunnels and an outlet tube positioned at the top of said funnels for-overflow precipitating' liquid. i

In testimony whereof, I have signed my name to this specification this 15th day'of y7' 2 V r p HUBERT KEMPE.

provided with groups of separate apertures forforming a plurality of individual filaments arranged in groups, said extrusionde-'

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