US2598752A - Spinning bucket liner - Google Patents

Description

June 3, 1952 P. E. BOLGER SPINNING BUCKET LINER PAUL E. BOLGE/P BY Filed March 16, 1950 INVEN TOR.

A T ORNE Y.

Patented June 3, 1952 SPINNING BUCKET LINER Paul Edward Bolger, Lewistown, Pa., assignor to American Viscose Corporation, Wilmington,

Del., a corporation of Delaware Application March 16, 1950, Serial No. 149,952

2 Claims. 1

This invention relates to spinning buckets and particularly to replaceable liners therefor.

The inner surface of spinning buckets, particularly-those used in the collecting of viscose yarn, are subject'to the, gradual accretion of deposits of solid material comprising solid or dissolved reaction products or other materials car'- ried into the bucketsas a result of the freshly spun yarn carrying liquid from a spinning bath intothe buckets. Because of the slight taper of the inner surface of a bucket to a larger diameter toward the rim section, material extraneous to the yarn. ultimately drains or is carried toward the rim section by centrifugalforce. To facili tate expulsion of the unwanted liquid and fineparticle solid material carried thereby, the spinning buckets are normally provided with ducts extending from the bucket interior along or through the rim section. Consequently, the flow of'the .material toward a discharge outlet, in the vicinity of the bucket rim is greatest along the upper portion ofthe nearly cylindrical cakeforming surface. It is along this section of the inner surface of the bucket, particularly adjacent the cover, that greatest deposition of solid material occurs. The deposits are of suflicient cohesiveness and firmness as to be abrasive to the cakesurface, particularly to surfaces of the cakes comprisingwindings of yarn laid directly onto the surface of the deposits, during removal of the cake from the bucket.

It has been noted that as the deposition increases, the amount of damage to the outer surface .of the cake increases. The damage is typifled by abraded yarn and broken filaments and is most prevalent on the cylindrical surface of the cake near its juncture with the end of the cake which is formed against the cover of the bucket. Damage of this nature does not occur to any extent right after the bucket has been cleaned but becomes increasingly noticeable during about three weeks of continuous spinning succeeding. a cleaning period. After this period, the percentage of cakes damaged in this manner appears to reach a maximum which is maintained until the next cleaning period. Removal and washing of the boxes will then reduce the percentage of damaged cakes. One approach to this problem has been to increase the frequency of the box washing but this entails a reduction in the operating time of equipment and an increase in the considerable labor cost involved in removing the boxes from their nests, transfering them to a cleaning station, and removing the objectionable deposits. Thus the value of the yarn saved by more frequent cleaning may be readily absorbed by the increased cleaning cost.

It is an object of the invention to provide in a spinning bucket, a cylindrical cake-forming surfaceto which solid material does not readily adhere or collect thereupon. Another object is to provide a replaceable liner to reduce the need for washing the box. Still another object is to eliminate the damage to yarn cakes caused by abrasion to the outer surfaces thereof while removing them from the buckets. Other objects, features and advantages will be apparent from the following description of the invention and the drawing relating thereto in which H Y Fig. 1 is a section view taken along its axis of a bucket'provided with a liner according to the invention;

Fig. 2 is a pictorial view of folded for storage; and V Fig. 3 is a pictorial view of the liner of Figs. 1 and 2 ready to be placed in a bucket.

According to the present invention, the inner cylindrical surface of a spinning bucket is covered with a disposable permeable liner of sufficientporosity to permit movement therethrough of liquid and particles of colloidal size, said liner comprising a material such as paper having sufficient-wet strength to permit removal thereof from the bucket in opposition to any adhesive relationship resulting from deposition of col-loidal material between the liner and the bucket.

Fig. 1 illustrates a bucket 5 having a thin porous liner 1 which covers the inner cylindrical surface of the bucket. The liner 1 may be placed in the dry condition in a dry bucket mounted on its driving spindle. The liners may be normally stored in quantity in a folded condition as suggested in Fig. 2 wherein aliner 1 is shown in the folded and flattened condition. A liner is formed into generally circular shape as shown in- Fig. 3 when it is to be placed in the bucket. As the bucket comes up to rotating speed, centrifugal force acting on the material of the liner urges and extends the liner against the cylindrical surface of the bucket.- Further conformity to the interior surface of the bucket is obtained from the wetting it receives when the acid is poured through funnel guide 8 and flushed through the bucket to lace a yarn 9 through the guide as it reciprocates substantially lengthwise of the cake I0 and the inner peripheral supporting surface provided within the bucket 5 by the liner 1. During the formation of the first cake within the liner, a small amount of solid material is deposited between the bucket and the liner which the liner of 1 apparently holds the liner to the bucket surface in mild adhesive relationship during the collection and removal of later-formed cakes. The adhesive relationship is probably further aided by the contact of wet fibers along the outer circumference of the insert with the cylindrical surface of the bucket although the invention is not to be restricted to any particular theory respecting the cohesive forces producing this adhesive relationship. The material of the liner provides sufficient wet strength that the liner may be reits surface and to a substantial extent in a direction parallel to its surface. g

Any permeable paper'or paper-like sheet material of the required porosityand having good wet strength can'be formed into the inserts of this invention. Such papers as have found use in the manufacture'of individual-portion tea bags are satisfactory. Papers made from natural fibers, such as wood, cotton, hemp, linen, albaca,

or from synthetic fibers such as regenerated cellulose fibers such as are obtainable from viscose or cuprammonium cellulose solutions, of lengths from about It; inch or" longer for high wet strengths may be successfully used. Any permeablepaper which has increased wet strength as a result of resin-impregnation during or subsequent to their formationinto a sheet is suitable' Examples of such papers are those which are formed from fibers either of paper making length or greater than normal paper'making length impregnated with synthetic resinous materials, such as urea formaldehyde, phenol formaldehyde, melamine-formaldehyde resins or the like. Other suitable liner-forming materials are those of paper-thin felts made from fibers either of paper or textile making lengths comprising a small proportion of synthetic resinous material in the form of potentially activatable fibers which may be activated to a tacky condition by heating or by temporary presence of a solvent in the surface layers thereof; liner forming materials may also consist entirely of such activatable fibers which are caused to adhere to each other as well as to the non-activatable fibers, if any, wherever they touch by activation to an adhesive state and subsequent deactivation.

It is found that'after continued service, the inner surfaces of such liners consistently present clean, smooth surfaces to the cakes and consequently do not cause the abrasion and other disturbance of the outer windings of the cakes that is evident on cakes that have been formed in unlined buckets which have been used sufficiently to substantially lose their initially clean cakeforming surfaces. It is believed that the ability of the porous liners to absorb and conduct liquids and solids in a direction normal as well as in a direction parallel to their surfaces is responsible for their clean smooth surfaces. These surfaces are normally as non-abrasive after six or eight weeks of service as during the first week. However, the liners may be easily replaced and are inexpensive compared to the cost of the labor and lost production resulting from removal and washing of the boxes. The period for replacing such liners may be fitted conveniently into an operation cycle wherein the spinning equipment is periodically drained and dismantled for cleaning and reconditioning. At such time, it is preferable to wash the interior of the boxes to provide a clean surface for receiving the new liners.

While preferred embodiments of the invention have been shown and described, it is to be understood that changes and variations may be made without departing from the spirit and scope of the invention as defined in the appended claims.

I claim:

l. A method of collecting a wound package of a strand comprising the steps of passing the strand into a rotating container along a path extending along its axis of rotation, then passing the strand toward the inner surface of the con-' tainer along a radial path, guiding the yarn to reciprocate the radial path within the container in an axial direction substantially the entireinterior length of the container, receiving liquid and fine particle material passed centrifuga-lly through the collected strand in a permeable liner disposed between the collected strand and the interior peripheral surface of. said container, conducting the' liquid and particulate material through and along the liner in a direction arallel to its interface with the container to adischarge region extending radially outwardly from the liner, and removing the package from the container Without removing the liner. I

2. A method of collecting a yarn cake in a spinning bucket having. a cylindrical yarn-collecting surface which is slightly tapered comprising the steps of passing a yarn into the bucket along its axis of rotation, then passing the yarn in a path toward said surface, guiding the yarn to reciprocate said path within the bucket in an axial direction substantially the entireinterior length of the bucket, receiving liquidand fine particle material passed centrifugally through the yarn in a porous liner disposed between the collected yarn and the interior surface of the bucket, discharging the liquid and particulate material in a radially outward direction from the end of the yarn-collecting surface having the greatest diameter, and removing the cake from the bucket without removing the liner.

PAUL EDWARD BOLGER.

REFERENCES CITED The following references are of record in the file of this patent:

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