Patented Apr. 12, 1949 214679214 UNITED STATES PATENT OFFICE 2,467,214 SPINNING COT Enrique L. Luaces, Dayton, Ohio, assi-gnor to T3ie D,t@,ton Rubber Con,@2ipny, i corporation of Ohl.o APPUcatio-.i October 7, 1944, Serial No. 557,586 3 Claims. (Cl. 260-41.5) 2 This invention relates to textile machinery. Ilore particularly, this inve7-ition r-,Iates to spinning cots aiad roll coverings made o@.F synthetic rubber col-,iposition characterized by their noil-- eyebroiving characteristics. @Vhile this invention wil-, be described in coii- 5 nection with the making of a spi-nning cot, it will readil.y b-- understood, by those skilled in the art, that this invention is as well adapted for forming other textile units such as tem73le rolls, loom take-up roll coverings, and the like. 10 A good spinni-ng roll or cot possesses good:ftber drafting characteristics, exhibits low static charge build-up, is resistant to attacks by oil and abkasive substances and has good aging and wear resistirl-g properties. A good cot or spinning 15 roll is further characterized by a suri'ace which inhibiis e@ebr6wing throughout the life of the cot and has substantially no tendency tov%rard lappin@-up. The important characteristic of non-eyebrow- 20 ing is eiihanced by a certai-n degree of physical roughnessonthesurfaceofthecot. Thisroughened @urface may be obtained by buffing the cot at the time of manufac ure, but such a surface will wear down and ultimately beco-me smooth. 25 it is then necessary to re-buff the cot in order to restore its original quality. The ideal cot presents a surface to the fibers being drafted which is rough to the required de- 30 gree throughout the life of the drafting unit. To this end, cots have been made which include a finely divided addition material -which is incorporated in the cots when they a@e compounded. Among the substances which have been used as 3j the addition material are salt, sand, ground hard rubber, buffings, shredded leather, cork, cellulosic material and the like. As the surface of cots compounded in this mayiner wear down in use, the particulate addition material is brought 40 to the surface and falls off, thiis leaving a finely pitted or porous surface which possesses the desired texture. While t.@ie texture of such cots is satisfactory, the use of salt or sand or similar materials has 45 produced unsatisfactory results in other respects. For example, salt will deliquesce in the humid atomsphere of the processing rooms with the result that the surface of the cot becomes moist and gummy. On the other hand, the particles of 50 sqnd incorporated in such cots are highly abrasive and cause damage to bearings and sliding surfaces as they fall thereon from the cot surface. Other addition products may likewise interfere w,,th proper o- _oeration of mechanical equipment. The present iiivention has for its primary purpose to produce a cot having a suitably pitted or roughened surface while avoiding the disadvantages of salt or salad or other similar additi-oli r@iaterials. l@ccording to this invention, a cot is provided which has a w-ore or less iiniformly porous structure throughout caused by the removal from the body of the cot addition material uniformly distributed in the un,;ulcaiiized cot material. H,,ivin!,T a body @vhich is porous throughout, the cot, therefore. presenl',s tl-iroughout its life a roughe,-n-ed surface to the textile fibers which it is drafting. The present invention will be more fully understood from the following description taken in connection with the attached drawing, in which: IIigure I is a diagranimatic view of a roll having a cover made according to this invention; Figure 2 is an eiilarged diagrammatic view of the roll having the addition material therin; Figure 3 is a view similar to Figure 2 but showing, diagrainmatically, the condition of the cot subsequent to the removal of the addition ir@aterial; and Figure 4 is a diagrammg@tic view showing one method of removing the addition material. Reftrring to the drawings more in detail, the ntir-rieral 10 indicates a spinning roller and the numeral 12 indicates the covering thereon. In Fq-gure 2 the cover 12 is shown as containing a plurality of particles 14 which are dispersed throughout the body of the said cover. The cov,-@r 12 may comprise a section IS at the inner portion therebf which serves as a tension section thereby addin.@ to the strfngth of the cot or covering. In Figure 3 the addition particles 14 have been removed and the cover 12 will be seen to contain a plurality of pores or pits I 8 which are of various size and extend for different distances into the body of the cover. It wil'i be iioted tb-e porosity caused by the said pores is substanti-ally continuous throughout the body of the cover. In Figure 4, the roll cover 12 is shown a@s

3 mounted on a mandrel 20 which is preferably of non-magnetic material. The mandrel 20 is rotatably supported in a substantially C-shaped member 22 which is, preferably, formed of magnetic material. The member 22- cor@iprises a depending portion 24 extending toward the surface of the cover 12 and about which is wound a coil 26. Any suitable source of electrical energy may be selectively connected with the leads 28 of the coil 26 so as to energize the latter. The particulate addition material indicated at 14 in Figure 2 comprises particles or flakes of magnetic inaterial which has been thoroughly admixed with the rubber-like composit-lon of the cover prior to the vulcanizing of the latter. After the aforementioned mixing, the cover is molded and vulcanized and the cot or roll cover is placed on the mandrel 20 and electrical energy is supplied to the coil 26 from the leads 28. The mandrel 20 is then rotated at suitable speed so that the particulate material is pulled outwardly from the body of the cot or roll cover, leaving the latter in a finely Ditted or porous conditi.on. Following the manetic treatment of the cOt Or roll cover, the surface thereof may be ground or buffed or otherwise suitably machined to the proper working finish. The resiilt-ing cot surface is dry and smooth to touch but has minute pits or pores therein and, inasmuch as the addition material was dispersed throughout the body of the cot, wear and regrinding of the surface will not destroy the desirable texture thereof. While it will be apparent that this invention may be employed wil@-h advantage in connection with any type of vuleanizable cot rnaterial, I have found th,.it the best synthetic rubber-like material comprises butadiene copolymer of acrylic nitrile coiiipounded with fillers, vuleanizing agents and otlier ingredients. Such cots have excellent fiber drafting properties and exhibit substantially no tende@@-icy to collect fiber on the surface thereof. Neither do they exhibit a tendency to groove, or to collect static charges and are substaiitially unaffected by oils and greases. In addition, cots formed of butadiene acrylic nitrile copolymer possess substantially greater durability than the best leather cots. As a typical example of a spinning cot composition employiiig butadiene acrylic nitrile copolymer, I submit the following formwa: Example Parts by weight Butadiene-acrylic nitrile copolymer --- 80-125 Dibenzyl ether ---------------------- 10-25 Cumarone resin --------------------- 6-12 Zinc Oxide -------------------------- 4-8 Whiting ----------------------------- 40-70 SuIfur ------------------------------- 1-2 Benzothiazyl disulphide -------------- 0.9-1.5 It will be understood that the particular amount of butadiene acrylic acid copolymer given in the example above may be varied considerably in order to control the characteristics of the finished cot, but I prefer to use from 30 to 55% by weight of the composition. The hardness of the cots as rneasured on the Shore type "A" duro-meter is preferably within the range of 50 tG 95 and niay be controlled, as well as the toughness and resiliency of the finished article by suitable additions of carbon blackzinc oxide, clays and other materials well know@ 2,467,214 4 in the art of compounding natural and synthetic rubbers. While it will be apparent that this invention is not necessarly limited to any specific composition, in or@er to produce a cot having improved drafting characteristics, in order to realize the greatest advantages, it is necessary to use a copolymer of butadiene similar to the one given in the example. Copolymers of butadiene 10 and styrene, for example, may be used advantageously in the practice of my invention. It v,7ill be uiiderstood by those skilled in the art that ray im-oroved cot or roll covering having porous characteristics may be used in making a 15 great variety of fiber-working machine elements for use in the textile industry. For example, variolis types of rolls, covers, jackets, aprons and the like used in drafting, conveying, rubbing and fiber-working may be advantageously manufac)o tured using my ir.,iproved method. It will also be understood by those skilled in the art that the degree of vulcanization or curing riiay be so controlled as to produce any specific physica,l property d(@sired. Also, the amounts of 25 the different ingredients n-iay be varied or have equivalents substituted therefor in order to prodiice a product of any desired degree of hardness, elasticity and frictional characteristics. In each case the ingredients are preferably com30 pounded with a copolymer of butadiene and thoroughly mixed with the finely divided magnet ' i 'c addition materiai, molded to the desired shape or form, vulcanized, magnetically treated to remove the addition material and, when 35 recessary, the surface ground, buffed, abraded, or otherwise treated or pro,- essed to give it the desired surface characteristics. It will be apparent that the particles of magnetic material need not, necessarily, be complete40 ly rerrioved from the body of the unit in order to ,,,ccomplish the objects of this invention. For example, the body may be treaterl. rqagneticaily in order to displace the particles froin their original positions thereby breaking whatever bond 45 ex,sts between the Said particles and the rubberlike body. Then, as the cot wears down the loose particles will fall off the surface thereof leaving the same suitably porous. In addition, it will be understood that it is not 50 rny intention to be limited to the specific details herein set forth, but that I desire to comprehend such modifteations as may come within the spirit of thi(@ disclosure and the scope of the 55 appended claims.