US1654936A - Method of making spinnerets - Google Patents

Description

Jan. 3, l

H. J. JONES METHOD OF MAKING SPINNERETS Filed March 25, 1926 lNVENTOR;

* r ATTORNEYS.

Patented Jan. 3, 1928.

UNITED STATES 1,654,936 PATENT OFFICE.

HARRY J. JONES, 0F IRVINGTON, NEW JERSEY, ASSIGNOR TO BAKER & COMPANY,

INC., A CORPORATION OF NEW JERSEY.

METHOD or MAKING srI'NNEBErs.

Application filed March 28, 1926. Serial No. 96,821.

In spinnerets such as are emplo ed for the manufacture of rayon or artificia silk from cellulose in solution and the like it is desired to have a large number of minute orifices through which the solution may be extruded to form the strands of the thread,

and there are many difiiculties in drilling ofholes which can be practically produced in a spinneret; to provide a method of making a spinneret with orifices which have been drawn, and to obtain other advantages and results as may be brought out by the following description.

eferring to the accompanying drawings, in which the same reference numerals designate corresponding and like parts throughout the several views,

Figure 1 is an enlarged central longitudinal section of a spinneret body drilled for carrying out my invention;

Figure 2 is an enlarged similar section of a portion of the extruding end of the spinneret body with pieces of cored wire inserted in the drilled apertures shown in Figure 1;

Figure 3 shows said pieces of wire expanded in their apertures and with their ends made flush with the surfaces of the spinneret body;

Figure 4 is an enlarged view of a complete spinneret made in accordance with my invention, the core of the wire fillings shown in Figure 3 having been removed, and

Figure 5 is a plan of the same.

Referring to the specific embodiment of the invention shown in said drawings, 1 indicates a spinneret body of any suitable and well-known form and construction, although for convenience I have shown it a single piece of sheet metal drawn into cap shape. Preferabl for carrying out my invention, the extru 'ng end 2 of said body 1 is of sheet metal and apertures 3 are drilled or punched therein. Longitudinal pieces 4 of wire having a core 5 and envelope 6 are then inserted in said apertures 3, the wire preferably being of such size that said pieces frictionally fit 'in said apertures. The core 6 of said wire is wit of a material or materials which will be dissolved by a suitable reagent and is of a size which will form an extruding orifice of the desired minuteness when it is so dissolved, the envelope and the extruding end of the splnneret being of a material which will not be attacked by such a reagent.

After the pieces 4 are mserted in the apertures 3 they are expanded therein so as to engage the walls of said apertures imperviously and firmly enough to-resist displacement, said expansion being produced for example by pressure upon their outward ends by any suitable mechanism such as a hammer or press. After such expansion, the ends of the-pieces of wire are if necessary further made smooth and flush with the opposite sides of the extruding end late 2 of the spinneret by abrading or p0 ishing in any suitable and well-known manner. Preferably as a last step, in order to avoid any mutilation of the orifices by operations after they are opened, the cores 5 are dissolved out, leaving orifices 7 and the spinneret is complete as shown in Figures 4 and 5.

By my improved method, the extruding orifices of a spinneret may be as fine as are possible to obtain by drawing and thus much finer than it is mechanically feasible to drill. For example, if it was desired to make orifices two thousandths of an inch in diameter, I would produce'a compound wire with a core of that diameter and an envelope of about ten times that diameter and insert pieces of it about eleven thousandths in length in apertures drilled in a plate of about ten and one-half thousandths in thickness. The compound wire might have a copper or a silver core in a platinum or gold envelope, the end plate 2 of thespinneret being also of platinum or gold, in which case nitric acid would be employed as a reagent, or the core might be of iron in which case hydrochloric acid would be employed. Obviously various combinations of materials could be employed so long as the core could be dissolved out affecting the rest of the spinneret, and various sizes and proportions of parts could be em loyed as desired for various purposes. A so while I have described expanding pieces of compound wire in the apertures of the extruding plate, it will be obvious that they could be secured in any suitable and well-known manner and their end surfaces then made flush with the extruding plate or not as desired. The spinneret itself may be of any desired form or construction, so long as it has an extruding plate with a plurality of extruding orifices, and many other changes could be made in carrying out my improvements without departing from the spirit and scope of the 111- vention, so that I wish to be understood as not limiting myself except as required by the following claims when construed in the light of the rior art.

Having thus described the invention, what I claim is:

1. The method of making extruding orifices for a spinneret which consists in forming apertures, mounting in each of said apertures a piece of wire having a core, and dissolving out the cores of'said pieces of Wire. 7

2. The method of making extruding orifices for a spinneret which consists in forming apertures, expanding in each of said apertures a piece of wire having a core, and

dissolving out the cores of said pieces of wire.

3. The method of making extruding orifices for a spinneret which consists in forming apertures, expanding in each of said apertures a piece of wire having a core by pl'essu re'on its ends, and dissolving out the coresof said pieces of wire.

4. The method of making extruding orifices for a spinneret which consists in forming apertures, expanding in each of said apertures a piece of wire having a core by pressure on its ends, making said ends flush with the apertured' surface, and dissolving out the cores of said pieces of wire.

5. The method of making extruding orifices for a spinneret which consists in forming apertures, expanding in each of said apertures a piece of wire having a core by pressure on its ends, finishing the surfaces of said ends and dissolving out the cores of said pieces of wire.

HARRY J. JONES.

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