US2935837A - Spinning pot - Google Patents

Description

fin edst tcs Patent 4 SPINNIN GPOT s Bernardus Genrdesfllreda, Netherlands, assignor to American Enka Corporation, Enka, N.C., a corporation of Delaware Application february 11, 1957, Serial No. 632554 I '1 e (Ct-5H0 Thisinvention relates in generalto' a spinning pot used in the manufacture of synthetic yarn and more particularly to an improved buffer ring and its attachment to the top rim of said spinning pot.

In one method of manufacturing synthetic yarn, such as viscose rayon, after extrusion into a spin bath and after suitable aftertreating, the yarn is fed into what is known in the art as a spinning pot. This spinning pot comprises a cylindrical housing rotatably mounted on a vertical axis and having an opening at the upper end into which the yarn is fed. By the action ofcentrifugal force the yarn is urged against the inner vertical wall surface of the pot and collected in cake form. The spinning pot is manufactured from metal, such as aluminum, and, in order to prevent corrosion, usually is coated with a lacquer over the, exposed surfaces thereof.

Upon completion of cake formation, rotation of the pot is discontinued and the cake is removed therefrom. In order to dislodge the cake from within, the pot must be inverted, with the open end extending downwardly,

and struck forcibly against a solid object, such as a table top or portions of the spinning machine framework. Repeated striking of the spinning pot against a solid object results not only in rupture of the aforesaid lacquer surface coating but also results frequently in chipping and other damage to the top rim at the open end of the metallic pot.

In order to obviate this rim damage, it has been pro posed to form a buffer ring from a laminated material composed of an artificial resin and a fabric and to attach this ring to the top rim of the spinning pot, with a portion of the ring overlapping the top rim and extending inwardly of the pot. The very nature of this type buffer ring is undesirable from an economical standpoint since the ring must be accurately machined to precise dimensions comparable to and compatible with those of the spinning pot. Furthermore, the resiliency of this type buffer ring is relatively low resulting in early and certain damage thereto and frequent replacement. Moreover, this ring affords much less protection to the pot during cake removal than that afforded by one which is more resilient, resulting in occasional pot damage even when the same is provided with a buffer ring.

It has now beenfound that the buffer rings remain undamaged over a longer period of use and that consequently the useful life of the spinning pots, that is, the period before replacement of the buffer ring and/or application of a new lacquer coating thereto is necessary, is increased if the buffer ring consists of a flat elastic ring which is attached to the top rim of conventional spinning pots.

It is therefore an object of the present invention to pro-- vide a spinning pot with a buffer ring not having the disadvantage of known expedients.

It is another object of this invention to provide a spinning pot with a butler ring which is more elastic than known rings and less susceptible to damage during the practice of conventional cake removing processes.

7 2,935,837 Patented May lO, 1960 Still another object of this invention is to provide a buffer ring which affords better protection of the spinning pot against damage during the removal of a cake therefrom. i

In accordance with the present invention an elastic ring, preferably fiat, is glued or otherwise attached to the top rim or upper surface of the spinning pot. For purposes of this discussion, it is intended that the term elastic include natural rubber, synthetic rubber or any other material having substantially the same resiliency as rubber, especially a sponge-like coating applied to an artificial base such as polyvinyl chloride, polyamides, polyesters or polyurethanes.

- Other objects and advantages will become apparent from the'following detailed description taken in conjunction with the drawing, which illustrates an elevational view, in section, of an embodiment of the present invention as applied to a conventional spinning pot.

In the single figure, an aluminum spinning pot of the usual configuration is represented by reference numeral 10. In order to prevent corrosion of the aluminum by the acid carried along with the yarn to be wound, the spinning pot 10 is provided over its entire exposed surface with a lacquer coating 11. On the top rim 12 of the spinning pot there is adhesively attached a buffer ring 13 of elastic or resilient material. As can be seen from the drawing, the inner surface 14 of the ring is flat in order to conform to the outer surface of top rim 12 and the outer surface 15 is flat in order todistribute the impact or striking force to which the pot is exerted during cake removal.

The outer diameter of buffer ring 13 preferably is less than the outer diameter of the pot 10. This protects the ring from damage during handling or cake removal in the spinning room. Moreover, the inner diameter of the ring is greater than the maximum diameter of the yarn collecting inner surface 16 of pot 10 in order that presence of the ring 13 on the pot will not hinder removal of the cake therefrom.

In applying a rubber ring in accordance with the teachings of the present invention, the adhesion of the ring to the top rim of the lacquered spinning pot may be improved considerably if the rubber of the ring, or at least the surface thereof, is cyclized or roughened before the ring is glued onto the top rim.,

This cyclization may be carried out by treating the rubber ring at room temperature with a solution containing sulphuric acid for approximately one minute, after which the ring is washed with water and dried.

The adhesion of the rubber ring to the top rim of a spinning pot may be improved still further by roughening the surface of the top rim to which the ring is attached. Also, in order to ensure a more permanent attachment, it may be advisable to provide adidtional glue to the boundary seam between the top rim and the ring after the initial application of glue has somewhat hardened.

Various kinds of commercially available glue or adhesive means may be used to attach the buffer ring to the top rim of the spinning pot. It has been found that a very satisfactory adhesion is obtained by the use of a glue having an epoxy resin base, such as commercially available Resiweld or Smooth-on, it being understood that the ring securing means must withstand striking forces 'exerted on the ring during cake removal as well as cen- 3 the lacquer coating if near the top rim of spinning pct 10 is obtained if the thickness of the buffer ring" amounts to at least 2 mm. It is pointed out, however, that rings having a difierent thickness may be used with satisfactory results.

As a specific exam le", applicant attached a butter ring formed from natural rubber, which had been treated with a solution containing 80% sulphuric acid, washed' and dried, to the top rim of a spinning pot by the use of a glue having an epoxy resin base. This ring protected the lacquer surface on and adjacent to the top rim of the spinning pot against rupture usually caused by repeat ed blows inherent in the cake removing process and al'sn remained securely attached to pot 10 during the spinning process.

What is claimed is: I

Apparatus forcollecting synthetic yarn in cake form comprising a cylindrical spinning" pot having a vertical ates 5,837

axis of rotation and a top rim provided with a flat outer to the flat outer surizace of said top rim.

References Cited in the file of this patent UNITED STATES PATENTS 1,629,142 Bonell May 17, 1927 2,575,446 Gollong t Nov. 20, 1951 FOREIGN PATENTS

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