US1493545A - Process and means for manufacturing artificial silk by the stretching spinning method - Google Patents

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may 13 1924. 31,493,545

, M. HOLKEN, JR PROCESS AND MEANS FOR MANUFACTURING ARTIFICIAL SILK BY THE STRETCHING SPINNING METHOD Filed Jan. 25, 1923 Fig.1

ii atent May 13, 111924.

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MARTIN HoLKEN, an, or BARMEN, GERMANY.

PROCESS AND MEANS FOR MANUFACTURING ARTIFICIAL SILK BY THE STRETCHING- SPINNING METHOD.

Application filed January 25, 1823. Serial No. 614,824.

To all whom it may concern: I

Be it known that I, MARTIN H6LKEN, J r1, a citizen of Germany, residing at Barmen, Germany, have invented certain new and useful Improvements in Processes and Means for Manufacturing Artificial Silk by the Stretching Spinning Method, of which the following is a specification.

This invention has reference to the socalled stretching spinning method for producing artificial silk from cellulose solutions, and in particular copper-oxid-ammonia solutions in which means are provided for first passing the comparatively thick threads discharged from the spinning outlet, sprinkler or rose head first through a liquid flowing in the direction of delivery of the threads, and serving for the washing.

out of the solvent, the so-called precipitating liquor, the threads being stretched, that is to say distended to the desired degree of fineness upon their passage through this precipitating liquor, and during the-possibly directly succeeding passage through the-air,

and being then only solidified by treatment with a hardening liquid. With a view of producing as uniform an article as possible by the working of the spinning devices of which a greater number is ordinarily employed to work side by side of each other,

both the feeding with cellulose solution as well as the feeding with precipitating liquor is effected for each solution by means of a single container in common for a larger number of spinning devices. In spite of the regulation of the pressure of the precipitating liquid with apparent precision the desired result is not obtained, but on the contrary the threads furnished by the different spinning devices fed in common with the precipitating liquid, prove to be still lacking in uniformity. It turns out, in particular, that the solvent, thus for example copperoxide ammonia, in some of the spinning devices is but incompletely precipitated, while in other spinning, devices the precipitating. liquid is acting far too strongly so as to attack the threads. This result, according to my experiments seems to be due to the fact that in the same period of times a relatively larger amount of precipitating liquid is fed through one of the spinning devices, and a relatively smaller amount of the precipitating liquid through the other device on account of the difference in the resistances the precipitating liquid through the severalspinning means.

It is the object of this invention to overcome this difficulty, and in view thereof, provision is made to not only supply a plurality of spinning devices intended for the manufacture of uniform goods with precipitating liquid from a common container, but I also provide for distributing the precipitating liquid to each spinning device in exactly adjusted quantities agreeing for all the different spinning means. This object may be accomplished by providing a special pump of exactly adjustable, and controllable delivering capacity for feeding the precipitating liquid to each spinning means from a common container, the delivery capacity of all the pumps being adjusted in exact agreement, which may be effected for instance, by operating the pumps which may be constructed as rotary gear or cog-wheel pumps with an equal number'of revolution.

By means of this new method of procedure it becomes possible to so regulate the action of the precipitating liquor upon the threads that in all spinning means which are fed in common with precipitating liquid, a bundle of threads is obtained from which the solvent has been completely precipitated, and which on the other hand, has not undergone any injurious influence by the action of the precipitating liquid so that all the spinning means produce threads of exactly the I plurality of spinning dev-ices arranged side by side of each other, partly in front view and partly in vertical axial section, with the corresponding containers for the precipitat' ing liquid in vertical longitudinal section.

Figure 2 is a longitudinal section through one of the pumps.

In the drawing 1, 2, 3 indicate a plurality of adjacently arranged spinning devices, each provided with a spinning rose head or sprinkler a with admission pipe I) for the cellulose solution. The spinning sprinklers a, a are each arranged at the upperends of glass cylinders 0 each containing a downwardly narrowing glass funnel d which serves for the purpose of allowing the threads delivered from the sprinkler ato be downwardly guided together with the precipitating liquid.

Such precipitating liquor is admitted at the bottom of the cylinder 0 through a pipe 7; it ascends in the cylinder, and enters the funnel d by overflowing its upper edge, the liquid then flowing downwards with increasing velocity, and in its movement carries the bundle of threads along with it, from which the solvent is precipitated at the same time. The threads issuing from the spinning heads a, a are known to be comparatively thick, and upon their travel through the precipitating liquid, and, whenever required, during the directly succeeding passage through the air the threads are distended by mechanical stretching down to the desired degree of fineness; they are then solidified by the treat ment with a hardening liquid, and in conclusion they are coiled after, or even during the treatment with the precipitating liquid. The stretching of the threads is mostly eli'ected by the pull of the winding-up device, and may be assisted by the inertia of the precipitating liquid flowing in the direction of the delivery of the threads. The means for the treatment of the threads with hardening liquid are not shown in the drawing as they do not form a necessary part of the invention, and may be of any well known kind.

The spinning devices of which a large number may be arranged side by side of each other, are all fed from a common liquid tank 9 mounted above the devices. The precipitating liquid is admitted to each spinning device by means of a gear or cog wheel pump it of any well known'const-ruction and connected at its suction side by means of a pipe 2' with the common containeror tank 9, and on its pressure side by the pipe f already re ferred to with the glass cylinder 0 of the corresponding spinning devices 1, 2, Flow interrupting members k, are inserted in the pipe 2', in order to be able to cut out one or the other spinning device, whenever required. V

The cog or gear wheel pumps h. h are all of the same size and they consequently exhibit exactly agreeing delivering capacities,

and independently of the pressure prevailing in their feeding conduits 2', The cog wheel pumps h are driven by a common shaft 722, to which they are coupled by the pairs of gear wheels 91, 0 possessing exactly the same ratio of transmission in all of the pumps, so as to driveall the pumps with exactly agreeing liquid distributed to the several spinning de vices may be adjusted and regulated in common for all spinning devices, and in exact agreement, so as to correspond to the composition of the cellulose solution or to the desired degree of precipitation of the liquid which object is attained by adjusting the number of revolutions of the driving shaft m to be effected for instance by a suitable train of gear wheel or of frictional wheels ofknown construction, not shown in the drawing. By working in this manner the uniformity of the threads of artificial silk is insured, inasmuch as all spinning devices, which are fed jointly with precipitating liquid are caused to produce threads of exactly identical properties, that is to say, such threads from which the solvent has been removed by the precipitating liquid, but which are not attacked by the precipitating liquid. Among other advantages it may be mentioned-as one of the important constructional advantages of the device according to this invention, that there is no necessity of the conduits 2', 71 leading from the common elevated container to the several spinning devices or to the corresponding pumps having equal length, and there is the further advantage that the pumps may be connected to a common feeding conduit, inasmuch as the feeding output of the pumps h, h is independent on the pressure of the admitted liquid.

In place of the 00,; wheel or gear wheel pumps herein shown other pumps may also be used, if desired, such as piston pumps or other distributing means the feeding efficiency of which is exactly adjustable and, on the other hand, is independent of the pressure of the admitted liquid, so as to insure thereby the admission of exactly determinable quantities of liquid at all times.

The invention obviously admits of various alterations and modifications in accordance withdifi'erent modes of application,

and to suit the convenience of the operator.

and it is to be understood that all such changes are within the spirit of my invention and within the scope of the claims hereunto appended.

- 1. In the process of stretchingly spinning artificial silk threads from cellulose solutions, particularly from copperoxide ammoniacellulose solutions feeding a plurality of spinning devices jointly with precipmeatea m itating liquid, and distributing the precpitatin liquid inexactly measured quantities agreemg for all individual spinning devices.

2. In the process of stretchingly spinning artificial silk threads from cellulose solutions feeding a plurality of spinning devices jointly with precipitating liquid, and apportioning the liquid to each of said spinning devices in exactly measured agreeing, adjustable quantities. Q

3. In the process of stretchin ly spinning artificial silk threads from ce lulose solu."

tions feeding a plurality of spinning devices jointly with precipitating liquid, and apportioning the liquid to each of said spinning devices in jointly and concurrently regulatable quantities.

4. In the process of stretchingly spinning artificial silk threads from cellulose solutions, feeding a plurality of spinning -devices from a common source with precipitating liquid, and apportioning the precipitating liquid to each spinning device by a separate pump of exactly regulatable delivering capacity, the said capacity of all the pumps being concurrently adjustable.

5. In the process of stretchingly spinning artificial silk threads from cellulose solu-.

tions, feeding a plurality of spinning de-- vices from a common source with precipitat: ing liquid, and apportioning the precipitat: ing liquid to each spinning-device by a separate pump of exactly determinable delivering capacity, the delivering capacities of all the pumps being jointly and concurrently adjustable. i

6. Inthe process of stretchingly spinning artificial silk threads from cellulose solutions, feeding a plurality of spinning devices from a common source with precipitating liquid, and apportioning the precipitating liquid to each spinning device by a separate pump, of exactly identical, regulatable delivering capacity, all the pumps being driven jointly and with equal numbers of revolutions.

7. In an apparatus for-the manufacture of artificial silk threads by the stretching and spinning method in combination a plurality of spinning devices, each comprising a spinning sprinkler, adapted for the furnishing of comparatively thick threads stretchingly extensible to the desired fineness, a funnel mounted below the sprinkler adapted for the guiding of the threads issuing from the sprinkler, and of a precipitating liquid, and a cylinder surrounding said funnel for the admission of the pre-- cipitating liquid to the upper end of the funnel, a common source of supply for feeding the spinning devices with precipitating liquid, a number of pumps corresponding to the number of spinning devices,

' adapted for and of exactly determinable,regulatable delivering capacity, thepumps being connect-- ed on the one hand the common source of liquid, and on the otlierhand with one of the spinning devices, and a common driving member for the pumps, adapted to operate the latter so as to feed concurring amounts of liquid to the spinning devices.

8. In an apparatus for the manufacture of artificial silk threads by the stretching and spinning method in combination a plurality of spinning devices, each comprising a spinning sprinkler, adapted for the furnishing of comparatively thick threads stretchingly extensible to the desired fineness, a funnel mounted below the sprinkler. adapted for the guiding of the threads issuwith the common source of precipitating liquid, and on the other hand with .one of said spinning devices, a joint driving memher for the pumps adapted to operate the same with concurring numbers of revolution.

9. In an apparatus for the manufacture of artificial silk threads by the stretching and spinning method in combination a plurality of splnning devices, each comprising a spinning sprinkler, adapted for the fur nishing of comparatively thick threads stretchingly, extensible to the desired fineness, a funnel mounted below the sprinkler guiding the threads issuin from said sprinkler, and of a precipitate liquid, and a cylinder surrounding said funnel for the admission of the precipitating liquid to the upper end of the funnel, a common source of supply for feedin the spinning device with precipitating hquid, a number of gear wheel pumps corresponding to the number of spinning devices, and of exactly agreeing, controllable delivering capacity, the gear pumps being connected on the one hand to the common source of precipitating liquid, and on the other hand with one of the spinning devices, a common driving shaft for the gear wheel pum s, and gear wheel trains of the same ratlo o transmission for the coupling of the gear wheel pumps with the common driving shaft.

In testimony whereof I 'aifix my signature.

MARTIN HOLKEN, IR.

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