Graduate Thesis Or Dissertation
 

Comparison of strength, elongation and evenness of selected types of polyester sewing threads

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j9602359f

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  • The purposes of this study were: to compare the strength (single strand breaking load and loop breaking load), the elongation and the evenness of four types represented by 11 brands of polyester sewing threads available on the market in Corvallis, Oregon in January, 1976; to determine whether there were differences in the strength and elongation of black and white threads; and to find the correlations between: the single strand breaking load and the loop breaking load of a thread; the single strand breaking load and the elongation of a thread; and the breaking load and the evenness of a thread. The four types of thread were: corespun polyester/cotton 2 -ply, corespun polyester/cotton 3-ply, short staple spun polyester and tow spun polyester. Some differences were observed among different types and among various brands within the same type of thread in every property that was investigated. In comparing the single strand breaking loads, corespun 3-ply threads were significantly stronger than the corespun 2 -ply thread of the same brand; corespun 3 -ply threads exhibited no significant differences from tow spun threads; short staple spun threads were significantly weaker than corespun 3-ply and tow spun threads. Comparisons of loop breaking load indicated that tow spun threads still performed best, followed by short staple spun threads. Corespun 3-ply threads were weaker than both tow spun threads and short staple spun threads. The corespun 2-ply thread was the weakest of all. Corespun 3-ply threads had better extensibility than the corespun 2-ply thread and the short staple spun threads; short staple spun threads, in turn, were more extensible than tow spun threads. With a few exceptions, no significant differences in the breaking load and elongation of black and white thread occurred. The evenness of all 11 brands of thread was similar. Based on this study, the tow spun threads would be a good choice for fabrics with normal extensibility. Two of the three corespun 3-ply threads would be suitable for fabrics which stretch more. No significant correlations were found between: single strand breaking load and loop breaking load; single strand breaking load and evenness; and loop breaking load and evenness. Although a high positive correlation between single strand breaking load and elongation was not significant at the . 05 level, the relationship appears fruitful for further study because only the tow spun threads and one of the short staple spun threads had a much lower rate of elongation relative to the single strand breaking load.
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