US2372983A - Spinning bucket - Google Patents

Description

PY 3, 1945* H. M. RICHARDSON 2,372,983

sPINNNc BUCKET Filed March 29, 1944 Figi. Figi COTTO/V F/LL GLASS F/BER WA/PP Fig RESIN 5 Inventor: Heni^yM.Richardson,

b )v xmfm y @Attorney Patented Apr. 3, 1945 SPINNING BUCKET 'Henry M. Richardson, Pittseld, Mass., assig'nor to General Electric C New York ompany, a corporationof Application March 29, 1944, serial No. 528,653

3 Claims.

The invention relates to spinning buckets for use in the manufacture of artificial silk or rayon.

An object of the present invention is to provide a new and improved spinning bucket.

Another object of the invention is to provide a new and improved molded spinning bucket comprising a resinous binder and a filler so arranged that the bucket is capable of withstanding very high rotational speeds whereby the output thereof may be greatly increased.

A further object of the invention is to provide a new and improved spinning bucket which is Well balanced, inexpensive to manufacture, and which during use is capable of withstanding the excessive strains and stresses due t centrifugal force.

A specific object of the invention is to provide a. new and improved molded spinning bucket comlowing description of the invention taken in connection with the accompanying drawing in which:

high tensile strengths. However, the use of such fabrics in which both the warp and fill are of glass bers have not proven satisfactory in the molding of spinning buckets.' During molding, the high pressures involved in the moldingprocesls appear to become concentrated Where the warp and ller yarns cross. As a result, the glass yarns are crushed and the individual fibers ruptured at the numerouspoints o'f crossover. Consequently, it has not been possible heretofore to produce a molded bucket possessing the full tensile strength of glass fibers. Buckets made from such fabrics have not stood up under severe and constantusage.

The present invention is based on my discovery. that a combination glass liber-cotton yarn fabric comprising for example, a glass fiber warp' I and a cotton 11113, asis shown in Figs. 1 and 2,

Fig. l is a plan view of the filler employed in impart strength to the resin, various fillers `or reinforcing materials have been mixed with the resin prior to the molding of the bucket or have been introduced just prior to or during the molding operations. For example, it has been proposed to increase thestrength of the buckets by winding metal wire around the exterior of the bucket or embedding wire in the molded walls of the bucket. The use of such reinforcing materials increases the number of operations necessary for the manufacture of the bucket with the resultant increase in the cost of the flnished article. Various fillers have also been added to the resinous makes an excellent filler in the manufacture of spinning buckets when a plurality of sheets as illustrated by numerals 5 and 6, of this ller are inforcing agent in the direction perpendicular to spinning Abucket in which unbroken circumferentially extending strands of glass fiber yarn impart to the molded product the'high tensile strengths of such yarns. Preferably the yarn is composed ofglass fibers of small diameter,

such as iibers having a diameter of about 0.0002

inch and possessing a tensile strength of approximately 300,000 lbs. per square inch.

Test samples of laminated materials formed from a phenolic resin binder and a fabric filler binder in an effort to find a combination of filler and resin binder having the necessary strength. It has been known for some time that glass fibers of small diameters possess extraordinarily in which the glass yarn formed the Warp and the cotton yarn the ll were found'to possess exf tremely high tensile strengths. For example, test samples have been found'to have tensile strengths of from 46,000 to 66,000 lbs. per square inch in the direction. of the glass yarn.' n addition flexural strengths of from 50,000 to '79,000 lbs. per square inch were obtained. When buckets made from these materials are rotated at high speeds the continuous lengths of glass i'lbers extending circumferentially through the walls of the bucket resist the high stresses due to the centrifugal force to which the buckets are subjected. Furthermore, since the filler itself is of uniform density, molded buckets of uniform density can easily be made. Thus, the product is not only strong but also well-balanced.

Any of the well-known molding methods previously used in molding spinning buckets may be employed in the practice of the present invention with the combination glass fiber-cotton ller comprising the principal filler, at least in the walls of the bucket. The wall portions may be made for example by impregnating sheets of the filler of proper size with a heat-hardenable phenolic or other suitable resin. The sheet is then wound in the form of. a tube which is approximately'thes'ame diameter as the 'walls of the finished bucket but`is usually slightly longe! allowing lthe material to be folded under to form at leastI part of the bottom section of the bucket. Itis thereafter molded into the general shape of the finished bucket. In some cases it may be found necessary to mold the bucket in two opertions, the rst a preforming operation and the second a nal molding operation at desired pressures and temperatures. When' the glass fibercotton flller is used principally in the walls or in the walls and part of the bottom section of the and other acid-resistant resinous binders such as urea-aldehyde, urea-melamine-aldehyde, melbucket, the remaining molded portions lof the bucket 'l may comprise a resinous binder, preferably the same as that used with the glass flbervamine-aldehyde, etc. resin binders may be substituted therefor. In place of the cotton ll in the fabric filler, threads of other-organic mav terals, such as linen, may be used.

What I claim as new and desire to secure Letters Patent of the United States is: l

l` A spinning bucket comprising an acid-resistant resinous binder in combination with a fabric lle comprising glass yarn running circumferentially through thev walls of said bucket in the direction of the principal stress and organic yarn runningin a. direction perpendicular to the principal stress, the said layers being impregnated with said binder.

2. A spinning bucket adapted to withstand high stress in a circumferential direction comprising a plurality of layers of a fabric, said fabric comprising glass yarn generally extending in a ciri cumferential direction and organic yarn generally disposed transversely of said glass yarn, the said layers being impregnated with an acid-resistant binder and united by heat and pressure.

3. A spinning bucket adapted to withstand high stress in a circumferential direction comprising a plurality of layers of a fabric, said fabric comprising glassI yarn extending inI a circumferential diiection through the walls of said bucket and an organic fibrous filler disposed transversely of said glass yarn, the said layers being impregnated with an acid-resistant phenolic binder and united by heat and pressure.

' HENRY M. RICHARDSON.

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