Патент USA US2112597код для вставки
2,112,597 Patented Mar. 29, 1938 UNITED STATES PATENT OFFICE 2,112,597 I rnoonss 0F MAKING PACKAGES OF ARTIFICIAL YARN Ernest Lee Griggs, Jr., Waynesboro, Va... assignor to E. I. du/Pont de Nemours & Company, Wil mington/Del” a corporation of Delaware No Drawing. Application July 21, 1937, ' . Serial No. 154,835 '3 Claims. (01117-21) pirn package is secured. When the operators, by visual gauging, judge the pirn packages to be This invention relates to a process of making shipping packages of arti?cial yarn having char acteristically a low knot count, and particularly relates to a process of making shipping packages ' of the desired weight, the spindle position is . of arti?cial yarn having characteristically a low knot count and a uniform yardage. In the fol lowing speci?cation and claims, the term “knot" or its equivalent, unless otherwise stated, is meant to include only those knots arising from package ,10 transference of the yarn during various textile stopped and the pirn packageis do?ed and re placed with an empty pirn. Twistingof the yarn remaining on the supply package on to the/‘empty pirn is immediately started and the process is re peated; a sufficient number of additional spin- . ning packages being tied in to yield the requi site size of ‘pirn package. For convenience, this '10 system is described as staggered supply and stag operations. Generally speaking, the preparation of a cellu lose acetate yarn shipping Pa ckage is achieved in three textile operations consisting of spinning, 15 twisting, and coning. In the spinning step, generally a ?lamentous yarn is dry spun in a spinning cell and wound on gered do?ing. ‘ ' In the throwing step, the twisted yarn from the pirn package is transferred by a winding opera tion on to a. lightweight core, such as a paper'15 cone or metallic spool. ' Proceeding in the above-described fashion, one obtains surprisingly frequently in the shipping, _a bobbin immediately afterv issuance from the package produced by the three operations more cell. In attempting to obtain a spinning package knots andmorevarlations in yardage than would N) 0 of a given size, the thread is wound on the col naturally be expected. The presence of knots in lecting means for a given perio d of time, sched the yarn is a distinct disadvantage in that the denier, and uled according to the particular yarn, knots interfere with the needles and frequently spinning speed chosen. At the end of this sched cause stoppage and expensive delays in weaving, uled period, the operators pro ceed along the spin- ' knitting, and like textile operations. The varia 5 25 ning cells and windup positions composing the tion in yarn yardage is a source of trouble in that ‘ spinning machine, and each position is do?ed by the yarn packages exhaust unevenly and before substitution of an empty bobbin for the com the completion of the textile operation. ' pleted spinning package. In making spinning _ One object of the present invention, therefore, ‘1 packages in this fashion, I have now observed, is to furnish shipping packages containing a 30 30 particularly at high spinning speeds of 300 yards minimum of knots. > or more per minute, that the yardage in spin ning packages containing the same denier yarn varies considerably from packa ge to package even though spun on the same or different spinning Another object of the invention is, to furnish for a given yarn denier shipping packages con taining substantially the same yarn yardage. Another object of the invention is to wind con- 35 iation arises in large - sistently at the spinning machine yarn packages 35 machines. This yardage var part, from such factors and sources as the do?ing ‘containing substantially the same yardage of I skill of the individual operators, ‘the spinning ' a given denier sized or unsized yarn. ’ speeds of the individual spinning machines, slight Another object of the invention is to employ departures from the scheduled doi?ng time, etc. 40 This dif?culty of yardage variation in spinning packages of the same denier yarn has never been satisfactorily overcome until my present inven tion. In the twisting step, generally the yarn from 45 spinning packages containing from it» to 1% pounds of cellulose acetate yarn is given the de sired degree of twist on a downtwister, and is wound on a pirn or like carrier to form a pirn _ 50 package containing approximately 11/2 pounds of Generally, the operators patrol twisted yarn. back and forth along the length vof several down twister machines composed of a plurality of spin dlepositions and, as the yarn from a supply spin w ning package runs out, new supply spinning - ‘55 packages are tied in until the desired size of on downtwister machines-supply spinning pack- 40 ages containing 2 or .more pounds of yarn. Another objectof the invention is 'to form on downtwister machines pirn packages of knotless , ' twisted yarn. ' r . Speci?cally, the object of the invention is to 45 form, during three manufacturing steps, a ship ping'package of twisted cellulose acetate yarn . containing not more‘than one knot. More speci?cally,‘ theobject of the invention is to‘furnish a process wherein the above objec- 50 tives are accomplished. ' I I , According to my invention, a shipping package of cellulose‘acetate yarn'containing not more than one knot is produced, in three manufactur-_ ing operations, bya process comprising contin- 55 2 2,112,597 uously spinning and winding a predetermined yardage of at least substantially 25,000 yards of ning package, and a predetermined yardage of yarn is twistedon to the pirns in the same fashion knotless yarn vupon a suitable spinning carrier, as in the case of the ?rst set of pirns. By operat down-twisting the yarn from the said unit spin ing in this fashion, the supply spinning packages ning carrier to produce therefrom at least one‘ run out substantially evenly along the entire ma pirn package containing a substantially prede _ chine while forming sets of unit pirn packages termined yarn yardage and winding or throwing wherein the individual packages of the set con the yarn from at least two of the said unit pirn tain substantially the same yardage. . Thus, - packages upon a lightweight support to form the 10 said shipping package. In the preferred embodiment of the invention, ' the spinning, twisting, and throwing operations are conducted in the following manner: In the spinning operation, a meter or other 15 yardage-measuring device is connected to the face drive roll, on which rests the yarn-collecting means of the spinning machine, or, in the case of cap spinning, to the drive roll preceding the cap spinner. In turn, this yardage meter is connected 20 to a clock counter graduated in such a fashion as to designate when each position of the spinning machine should be dofl'ed. The clock counter and unit supply spinning packages having substantial ly the same yardage. Likewise, for convenience, the doi?ng of the entire downtwister niachine in the above fashion is designated as "flat do?ing” and the term “unit package” is used to denote the package containing a, predetermined yardage of twisted yarn. It will, of course, be obvious that a knotless package is obtained by the use of a ?at supply and the ?at do?lng of a unit package. In the coning operation, i. e., in the winding of - meter device is so set that 25,000—900,000 yards of continuous ?lamentous yarn are spun and 25 wound before the clock counter begins to move, the exact yardage setting depending on the yarn denier being spun. The yarn is collected, prefer ably, ona sleeve bobbin. When the meter indi cates that the predetermined requisite yarn yard 30 age hascollected'on the sleeve bobbin at the ?rst the yarn into the ?nal, shipping package, the twisted yarn from two or more of the previously prepared unit pirn packages is transferred to a paper cone or similar‘ lightweight core to form the desired sized shipping package containing a position of the spinning machine, the hand of the clock counter moves to the No. 1 position on the weight of yarn which is an even multiple of the weight of yarn in the pirn package. By operating in the above preferred manner, the number of knots arising from package trans— graduated scale, and the operator do?s the com pleted spinning package and starts the continu 35 ously spun yarn winding on an empty bobbin fer in the ?nal shipping package depends entirely 35 sleeve. Thereafter, at de?nite time intervals, the on the number of unit pirn packages going into the same. For example, in making a \3-pound cone package from two 1% pound pirn packages there will be only one knot in the ?nal package from package transference during the three steps 40 of spinning, twisting, and throwing. That is to say, the number of knots will be one less than the number of unit pirn packages going into the counter hand moves progressively to Nos. 2, 3, 4, 5,-6, 7, 8, etc. positions on the scale, and the operator in sequence therewith doifs spinning po 40 sitions Nos. 2, 3, 4, 5, 6,- '7, 8, etc. and simul taneously starts the formation of spinning pack ages on empty bobbin sleeves. In like manner, the . entire spinning machine is .doil’ed and the yarn allowed to collect once more into spinning pack shipping packages. 45 ages until the meter again indicates that the ?rst ' While the above represents the preferred proc es of the invention, it will be obvious to those skilled in the art that various modi?cations may spinning position is to be dofl'ed. By operating in this fashion, there is formed a completed spin ning package containing 2, 3, or more pounds of knotless yarn and having a yardage variation of be made withoutdeparture from the principles taught by the invention. 50 as little as 1-2% based on the total yardage of the package. speci?cally, if one employs a 3-pound spinning package supply, one may form in this fashion two 1 V2 pound pirn packages of substantially the same yardage for the same given denier yarn. For con venience, the term “?at supply" is used to denote the above practice of equipping a plurality of spindle positions of a downtwister machine with The number of yards of yarn wound on the ' spinning package should at least be 22,000 yards and preferably should be 45,000 to 900,000 yards In the twisting operation, a 2, 3, or more pounds unit spinning package is twisted on a down twister machine to form two or more unit v,pirn or more, Naturally, the number of yards in a spinning package of given weight varies with the 55 packages containing knotless yarn, and each denier of the yarn being spun. In spinning a low 65 denier yarn, more yards are wound on the spin pim having substantially the same yardage for a given denier yarn. ning package than in spinning a heavy denier A yardage-measuring device, such as a‘meter, is yarn. Thus, in spinning a 30 denier yarn, prefer connected on the downtwister machine to the ably 223,000 to 893,000 yards of yarn are wound 60 drive roll feeding the yarn to the ring traveler and into a spinning package, whereas in spinning a 300 pim. when the predetermined requisite yardage v denier yarn 22,000 to 90,000 yards are wound into .is collected on the pirn as indicated on the meter, a spinning package. In all cases, however, pro the ?rst spindle position is shut down, the pim ‘ceeding according to the process of the inven package is withdrawn, and an empty pirn is sub 65 stituted. After shutting down the ?rst spindle position, at de?nite time intervals of approxi mately one minute successive spindle positions are shut down until approximately 25% of the spindle positions of the spinning machine arestopped, 70 when the entire machine is shut down. The pim packages on the remaining positions are then doifed and replaced with empty pirns. After resetting the meter yardage-measuring device, the downtwister machine is started, the 75 empty pirns tied tov their individual supply spin tion, spinning packages of a given denier yarn are ' consistently secured which are substantially equal to the yarn yardage desired in‘ the completed spin ning package. _ I In the twisting operation, it is preferred to equip the entire downtwister machine with a "?at - supply" unit of supply spinning packages con 70 taining individually substantially the same yarn‘ yardage. Of course, different downtwister ma chines are equipped with the above-mentioned knotless supply spinning packages containing at least 22,300 yards and preferably 45,000 to 76 2,112,597 - 3 Theputstanding advantage of the invention is 893,000 yards of yarn, provided supply spinning packages of the same yardage are employed on that it gives in its preferred form a shipping package containing at the most only one knot each downtwister machine. At least two pirn during three textile operations and having sub packages of twisted yarn are made from each stantially the same yardage for a given denier supply spinning package, and in no case is more than one supply spinning package used in making yarn. However, the invention also has the ad of eliminating to a large extent burden two pirn packages of twisted yarn. (Preferably, vantage some bookkeeping as to the times at which nu one supply spinning package is measured oil‘ in the downtwisting operation to form two to four merous spinning and twisting machines should 10 doiled, since such is substantially automati unit pirn packages of twisted knotless yarn. The be 10 cally taken care of by the process of the inven pirn packages of twisted knotless yarn contain tion. The process of the invention also o?ers from 22,300 to M1000 yards of continuous yarn, the advantage of automatically pacing the oper according to the particular denier being spun. ators in dof?ng various positions at the spinning In ?at do?ing on a downtwisting machine, cer 15 tain minor deviations may be made without los ing the advantages of the invention. Thus, in starting the twisting operation, the yarn ends of the supply packages may all be tied to the empty pirns and all the spindle positions of the 20 downtwister started simultaneously; From an operating standpoint, however, this is less ad vantageous and, since the speed of the twisting machine is relatively slow and there is relatively little time lag between the starting of the ?rst 25 ‘spindle position and the end spindle position by the operator, the error in yarn yardage is rela tively small. _ machine. The process also eliminates any var iation in‘ yardage arising from miscellaneous factors such as di?erence in drive'roll speeds, etc. In the twisting operation, the simultaneous completion and removal of supply spinning pack ages on an entire downtwister machine is of great 20 assistance to the operator. Moreover, in using the ?at do?ng'system on ‘the downtwisters, all the spindle positions are down at one time and free of yarn so that the machine may be thor oughly cleaned, if desired, without contaminat ing and lowering the quality of the yarn. In addition, it is possible to spin large packages on . It is important in the downtwisting operation . the spinning machine, and to twist into pirn that a flat supply and ?at do?ing system be used packages which contain an even fraction, e. g., 1/2, $41, 1/3, etc.‘of the yardage contained in the . in order that unit packages are obtained and in spun package, thus permitting the use of pirns order that the beginning of a supply spinning v small to enable accurate control of package coincides with the beginning of the su?iciently twisting, elimination of mechanical di?iculties, formation of the pirn package and‘the end of the low initial expense and low maintenance costs. supply package coincides with (the end of the Any modi?cation of the invention which con formation of the same or a different pirn pack forms to the spirit thereof, is intended to be age. The result is a unit pirn package contain- , ing at least 22,300 yards of knotless twisted yarn. included within the scope of the claims. I claim: .. .. In the throwing step,'it is preferred that the 1. In a process for the production of improved, shipping package be made from .two unit-pirn arti?cial yarn wound packages, the steps which 40 packages 01 knotless twisted yarn.v The ?nal comprise spinning from a liquid thread-forming package, accordingly, will contain preferably at medium, a number 01.’ spun'packages of thread least 45,000 to 893,000 yards or more of twisted containing substantially the same denier and 'yarn containing only one knot. _yardage, twisting said packages into twisted While ‘the above invention is described‘ for packages which contain substantially 45 convenience in terms of cellulose acetate yarn; "thread equal yardage but which is a fraction of the it will be obvious that the process may "advan yardage of said spun packages, then winding said ~ tageously be applied in the manufacture of ship thread packages into a number of ?nal ping packages of any continuously dry spun yarn twisted thread packages of substantially equal yardage, comprised of an organic derivative of cellulose. the yardage in said ?nal packages being substan 50 Thus, instead of cellulose acetate, the yarn may tially an even multiple of the yardage in said be comprised of organic esters of cellulose such thread packages. ' as cellulose acetopropionate, cellulose acetobue twisted 2. The process as de?ned‘in claim 1, charac tyrate, cellulose acetostearate, or cellulose pro terized in that the yarn is cellulose ester yarn. .pionate, or of cellulose ethers such as ethyl or 3. The process as de?ned in claim 1, charac 55 1 benzyl cellulose. ' It may also be applied to arti terized in that the yarn is cellulose acetate yarn. ?cial _yarn made from viscose or from cupram \ \ monium cellulose, particularly when made by the bobbin process, or to other types of arti?cial gm 7 . ERNEST LEE GRIGGS, JR.