Thesis Details


Thesis Title: Trouble shooting in textile processing by use of the uniformity analyzer
Thesis Author: George Z. Dunn, Jr.
Abstract: There are many mechanical faults in cotton processing which may cause periodic variations in the resulting yarn, roving, or sliver. Each of these defects cause a particular pattern of thick and thin placed in the resulting materials. An eccentric part (roll or gear) on a drawing, roving, or spinning frame results in a wavy pattern of thick and thin placed in the material. The pattern formed in the material by a flat spot in the top roll is dependent upon the position (front, 2nd, 3rd, or back) on the particular frame. A flat spot in the back roll position has bery little effect on the resulting material. The third roll position (four roll frame) results in a thin place directly followed by a thick spot. The flat spot in the second roll position has little effect, but a defective front roll causes periodic thick places in the material. In some cases, especially in roving, periodic variations are obscured by other excessive nonperiodic variations making it difficult to detect the periodic irregularities. This trouble was overcome by constructing a grating periodograph which separated the periodic variations from the excessive nonperiodic variations. The grating periodograph is also valuable for separating two conflicting periodic variations of different wave length.