US2008037A - Spinning bucket - Google Patents

Description

Julyfls, 1935I c@ J. QUANTIN 2,008,037

SPINNING BUCKET Filed June 10, 1951 ,les

x l I Inverdfor Patented July 16,- 1935 SPINNING BUCKET Charles-Jules Quantin, Paris, France, assignor to Du Pont Rayon Company, New York, N. Y., a corporation of Delaware v ApplicationJune 10, 1931, Serial No. 543,252 In France September 20, 1930 9 Claims.

- This invention relates tol the manufacture of artificial threads. More particularly the invention relates to the manufacture of artificial threads from viscose; cuprammonium cellulose V' 5 or the like wherein the thread is collected in revolving buckets.

In the bucket-spinningmethod of manufacturing artificial thread the thread is collected in buckets which revolve at high speeds. These buckets are often moldedA from materials such as synthetic resin, which resists the action -of the liquids with which the thread has been treated. Such molded buckets, however, lack the strength tov stand high rotational speeds. Buckets are also made of metals or of metal alloys. `'I'hese buckets stand the high speeds of rotation but are corroded by the chemical action of the liquids carried by the thread. Attempts have been made to reinforce the molded buckets with metalsor to line the metal buckets with an acid-resistant material but 4these attempts have not been accompanied with satisfactory results.v f

' Where 'the molded bucket has been reinforced with metallic hoopsfor the line, or whereA it has been reinforced by inserting metal bands or other reinforcements in the cast material, it has not been possible to secure either dynamic balance or suiciently good adherence between metal and molded portion to prevent the separation of the molded material from the metal, and the subsequent cracking or breaking oil of portions of the molded material.

4Where an acid-resistant lining is provided foran improved bucket for the manufacture of artiiicial thread. Another object is to manufacture artificial thread at higher bucket speeds. Other objects of the invention will be in part apparent and in part set forth in the specification.

The objects of this invention are accomplished by molding or otherwise forming the body of the bucket from a material resistant to chemical action, and by sheathing the portions of the bucket subject to bursting stresses in a. material, capable of great resistance to disintegration by centrifugal forces, `which holds the molded portions of the bucket under compression.

In the drawing, Figure 1 is a cross-sectional view of a bucket made .according to my invention; Figure 2 is a second form of `bucket embodying my invention; Figure 3 discloses yet .another form of bucket embodying my invention.

In Figure 1, I indicates the molded, chemically inert portion, of a bucket made in `accordance `with my invention; 2 indicates a metallic sheathing which is applied to portion I of the bucket under tension so as Vto surround and reinforce the surfaces of the bucket which are subject to bursting stresses; II indicates the portion of the 15 bucket designed in any customary manner to be attached to the rotating mechanism of the manufacturing machine as by means of opening I6; I3 is an annular ledge circumscribing the upper portion of the bucket; 3 is a bucket cover resting -r upon the ledge I3; I4 is an undercut annulus with which annular spring ring '4 engages to keep the cover 3 in position; 4I is one end of the spring 4 turned up to provide the operator of the machine with a means of compressing the spring to withdraw it from its lockingrelation with annulus I4; I2 are small holes through the -wall of the bucket through which the thread liquids escape.

In Figure 2 is shown a form of bucket similar to that of Figure 1 except thatthe bucket has no cover and that the shape of the walls is somewhat diiierent.

In Figure 3 is shown a` modified form of bucket in which I indicates the molded section of the bucket; I I and I8 indicate the means for attach- 'ing the bucket to the rotating mechanism of the order to permit easy withdrawal of the bucket walls are preferably somewhat farther apart at the top than at the bottom to provide for easy withdrawal of the bucket cake.

It is my discovery that, if higher bucket speeds are to be attained, buckets must be reinforced with a. material which is capable of withstanding the bursting stresses of the resistant molded material and which must be held in such intimate contact with the molded material that no shifting or independent strains are set up in that material. In order to secure this eiIect it is necessary to reinforce the outside of the bucket throughout with a shell of suitable material such as aluminum alloys or steel. An aluminum alloy suitable for my purpose, although it will be understood that other aluminum reinforcements can also be used, contains about 1.25% magnesium and about 1% silica. If a steel skirt is used, it may be advantageously of austenitic structure containing a slight proportion of molybdenum and copper. l

'I'he skirt or reinforcement should be applied ln a manner to keep the molded interior of the bucket always under compression. This is advantageously accomplished by winding with wire under tension. Where a steel skirt is used, a skirt should be formed` having the same shape as the molded bucket but of diameter insufficiently great in the cold to go over the bucket. This skirt may then be heated until it expands sulciently to go over the bucket after which it is put in place over the bucket and allowed to shrink, holding the bucket with the force of contraction.

The term shell, as used in this specification, means a shell which substantially completely covers the outer wall of the liner;

An advantage of this invention is the ability to manufacture artificial thread at higher bucket speeds than are normally used at the present time, buckets of this construction being capable of sustaining a speed of 10,000 revolutions per minute. Another advantage is in the protection against chipping which is offered the outer surface oi' the molded bucket. Another advantage is in the formation of buckets having both great strength and high resistance to the chemical action of the fluids used in the preparation of articial thread. `Other advantages of the invention will be apparent.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that I do not limit myself to the specic embodiments thereof except as defined in the appended claims.

I claim:

1.V In a spinning bucket resinous means resistant to chemical action for holding thread and means for reinforcing and compressing the first said means so that spinning speeds higher than normal may be attained.

2. In a spinning bucket a thread holder held in a state of compression by a surrounding metallic sheath.

3. In a spinning bucket a synthetic resin thread holder held in a state of vcompression by a surrounding metallic sheath.

4. In a spinning bucket a synthetic resin thread holder held in a state of compression by a surrounding ferrous sheath.

5. In a spinning bucket a synthetic resin thread holder held in a state of compression by a surrounding aluminous sheath.

6. In a spinning bucket a thread holder of synthetic resin resistant to the action of treating liquids, surrounded and held under compression by a wound-wire reinforcement.

7. A centrifugal bucket comprising a metallic shell holding in compression a chemically inert liner.

' 8. A centrifugal bucket comprising a shell highly resistant to the bursting stresses -set up by rapid rotation holding in compression a chemically inert liner.

9. A centrifugal bucket comprising a strong sheath having high resistance to expansion at high speeds of rotation, holding in compression a liner resistant to the action of uids used in the manufacture of regenerated cellulose.

CHARLES-JULES QUANTIN.

Images