IL25307A - Yarn winding process and product - Google Patents

Description

Patents Form No. 3 PATENTS AND DESIGNS ORDINANCE.

SPECIFICATION.

"XAHH WINDING PROCESS AND PRODUCT" «psian nrnom nn o w s^ nn* , MONSANTO <30I¾PANYj a corporation organized and^ xls iHg uHd^p tfee laws of th« State of Delaware^ United States. of America^ of 800 liorth. Lindbergh Boulevard St. Louis, Missouri> United States; of Amerlea" do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement : - This invention relates to a yarn winding process and product and, mora par icularly, relates to a decimal winding process for forming heavy and large packages of industrial yarn on small yarn holders and the package resulting therefrom. The term "heavy denier yarn" and "industrial yarn" as used herein applies to yarn having a count of approximately 8ij.O total denier and above. Nylon yarns of 8ij.O denier are used in tire cord production and are an example of industrial yarn.

Conventionally, large diameter packages of heavy denier yarn have not been packaged on small diameter yarn holders, i.e., bobbins, pirns, tubes, and cones. Early efforts made to wind large packages of heavy denier yarns o small yarn holders using short traverse strokes of approximately six (6) inches and employing known wind ratios were unsuccessful. Suggested wind ratios of bobbin revolution to traverse cycles per minute such as 3:1 and ij.:l were tried. The packages formed using the known wind ratios were unacceptable and below standard due to pronounced sloughing of the wraps. The problem was particularly difficult in winding so-called flat yarn or yarn having substantially no twist imparted therein. It has been discovered that heavy denier yarns, including flat yarns and yarns having low friction finishes applied thereon, can be successfully wound to form stable, acceptable yarn packages if a specific new and critical decimal winding ratio range is used.

For purposes of illustration, the process and package embodying the invention will be described as carried out on a cone winding machine. It will be understood that need not be a cone but can be straight tube. In cone winding, a constant ratio of bobbin or spindle revolution (rpm) to yarn traversal rate measured in cycles per minute (cpm) is maintained throughout the packaging operation. A selected ratio of spindle rpm to traversal cpm may be provided by a conventional gear-gainer mechanism. Success in winding an acceptable and stable yarn package of heavy denier yarn on relatively small diameter cones was achieved employing a critical decimal ratio of spindle rpm to traverse cpm. A phrase "traverse cycle" or a "yarn traversal" as used herein comprises one back and forth displacement of yarn on a bobbin or package circumference or circumferences.

The object of this invention is to form yarn packages of heavy industrial deniers, particularly those with little or no twist referred to as "flat" yarns, on small diameter yarn holders employing a cricitcal winding ratio.

According to the invention, stable packages of heavy denier yarn are formed on small diameter bobbins (less than two inches outer diameter for straight tubes and two inches mean outer diameter for cones) using a constant ratio of spindle or bobbin rpm to traverse cpm in the range of 3.3¾125:1 to 3 12500: 1.

A better understanding of the invention will be gained by reference to the following description and to the single Figure in the accompanying drawing.

The process and product embodying the invention are illustrated in the drawing in conjunction with a conin machine known as a coner 1. Only the essential features of the coner 1 are shown. Coner 1 includes a spindle 2 driven traverse guide 5 is positioned adjacent the bobbin. Traverse guide 5 is operatively connected to motor means 3 and adapted for reciprocation back and forth axially of the bobbin. The ratio of spindle rpm to traverse cpm is selectable through an interconnecting gear train 6. A pivoted pressure roller 7 surfacely engages the yarn package being formed, and an adjustable tension device 8 provides a desired tension .

Several examples of successful packaging of heavy denier yarns on small bobbins are given below.

EXAMPLE 1 According to this example, packages of eight (8 ) pound weight of heavy denier yarn were formed on cones of 3° 3' taper, of a length of 7-1/k inches, and of an outer diameter of 9-1/2 inches at the base. Coner 1 was equipped with a gear train to furnish a ratio of spindle or bobbin rpm to traverse cpm of 3. 35 125 to 1. Industrial heavy denier yarn of 8I4.O total denier and 11+0 filaments was unwound from a supply "cake" 9 and laced into the traverse guide 5 and about cone -Coner 1 was then operated. Stable, commercially acceptable yarn packages were produced. The yarn wraps on the packages tightly interlocked and did not slough. In forming packages, yarn winding tension was maintained at from l± -k5 gras at startup and was continually and smoothly decreased to a tension of I8-23 gms at the end of package formation. Roller 7 pressure at start-up was from 600-800 gms and was continually and smoothly decreased to 100-200 gms at the finish.

EXAMPLE II Acceptable, stable packages of eight (8 ) pound yarn packages of heavy denier yarn were formed employing the exception that the packages were wound with a ratio of spindle speed to traverse cycles of 3.1|.12500 : 1 and with only slight variation in winding tension and roller pressure.

EXAMPLE III Acceptable, stable packages of five (5) and ten (10 ) pound weight of heavy denier yarn were also formed employing the same coner referred to in Examples I and II and operating in the range of spindle speed to traverse cycle speed of 3.3 1+12 :1 and 3.1|12500 : 1.

The examples given above related to cone winding, however, the winding operation can be performed on small straight tubes and bobbins. The critical feature that provides a successful winding of yarn packages is the decimal winding ratio range provided. The tensions and forces of the pressure roll used are within known limits and are not critical.

It will be understood that variations and modifications of the invention are contemplated within the spirit thereof and the scope of the following claims.

Claims (1)

1. A winding process comprising winding heavy denier hereinbefore yarn packages on small cones having a mean outer diameter of 2 inches or less employing a ratio of bobbin to traverse speed in the range of A heavy denier hereinbefore yarn package on small bobbins having an Outer diameter of 2 inches or having a traversal of yarn spread over to package circum A yarn winding comprising formin heavy de ie as hereinbefore yar packages substantially as described in the herein Heavy denier hereinbefore de yarn packages whenever produced by the process claimed in eithe of claims 4 or insufficientOCRQuality