Effect of Moisture Content on Strength Characteristics of Non-Uniform Sewing Threads

Abstract

677.494.022.6: 687.03 and R. A. MakarovaWe consider the effect of moisture content on strength characteristics of composite sewing threads which are used for fabrication of technical textile articles. The proposed structure of the non-uniform sewing threads and the study results showed the effect of moisture on the strength of the threads. We established that even after prolonged exposure to water and temperature, the strength of the threads is sufficient for use of the finished articles.In the Spinning Department of A. N. Kosygin Moscow State Textile University, a technology has been developed for obtaining composite sewing threads which can be used for fabrication of articles used under life-threatening conditions: in such areas as metallurgy, fire fighting, oil production, in extreme situations, and under military conditions. The sewing thread identification codes are: 120 KShN KR-KA (composite sewing thread consisting of rusar multifilament yarn 29.4 tex and arselon multifilament yarn 29.4 tex) and 120 KShN KR-PrA (composite sewing thread consisting of rusar multifilament yarn 29.4 tex and arselon yarn 29.0 tex). Various technological requirements are imposed on the sewing threads (Table 1) depending on the intended purpose of the textile articles [1,2].During use of the textile articles, the sewing threads are exposed to both mechanical effects and the effects of weather (atmospheric effects). Mechanical effects on the thread include friction on surfaces of different hardnesses, transverse and longitudinal loads, etc. The effects of weather include weathering effects, the effect of ambient temperature, and also the effect of humidity (water and aqueous media). The latter occurs not only during use of the articles but also while they are stored.We should point out that the arselon fiber used to manufacture the sewing threads has high hygroscopicity (Fig. 1). We know that the functionality and reliability in use of articles of clothing depends on the level of hygroscopicity, and so the question of the interaction between moisture and filaments or fiber materials is extremely important.Based on the above considerations, we conducted studies of the effect of moisture on the strength properties of composite sewing threads with identification codes 120 KShN KR-KA and 120 KShN KR-PrA compared with rusar sewing thread. The tests on the sewing threads were conducted with brief (a) and prolonged (b) exposure to moisture. a) A thread of length 1 m was unwound from the packages and immersed in distilled water for a time ranging from 2 minutes to 10 minutes. Then the thread was aged on the filter paper for 15 seconds, after which the physical and mechanical tests were conducted on it. Each test was conducted for 30 seconds max, starting from the time the thread was removed from the water. The thread was put in a clamp under a tension half that used when testing it under standard conditions [3].The unit breaking load for the threads (P y , cN/tex) was calculated according to the following formula:where P aw is the actual ...

Effects of alkali solution on the durability of sewing thread made of modified polyphenylene sulfide and polytetrafluoroethylene

“…Therefore, the alkali resistance of sewing thread had an important impact on the service life of high-temperature dust removal bags. 25 There have been many studies that have focused on the effects of internal factors, [26][27][28][29] such as twist, twist direction, 27 linear density and rheological characteristics, on the performance of sewing threads, 29 and the influence of external factors, [30][31][32][33][34][35] such as sewing speed, temperature, humidity, acid and alkali solution, on its service performance. Tang et al 25 studied the influence of alkali solution on the mechanical properties of Nomex, polytetrafluoroethylene (PTFE) and E-glass fiber sewing threads to simulate the impact of corrosive gas and dust in high-temperature flue gas on sewing thread strength.…”

“…Tang et al 25 studied the influence of alkali solution on the mechanical properties of Nomex, polytetrafluoroethylene (PTFE) and E-glass fiber sewing threads to simulate the impact of corrosive gas and dust in high-temperature flue gas on sewing thread strength. Rodionov et al 34 studied the influence of moisture and temperature on properties of the composite sewing thread with identification codes 120 KShN KR-KA and 120 KShN KR-PrA. It was concluded that the composite sewing threads were strong enough to meet the needs of the finished product even if it was exposed to water or high temperature for a long time.…”

“…There have been many studies that have focused on the effects of internal factors, 26–29 such as twist, twist direction, 27 linear density and rheological characteristics, on the performance of sewing threads, 29 and the influence of external factors, 30–35 such as sewing speed, temperature, humidity, acid and alkali solution, on its service performance. Tang et al.…”

“…Rodionov et al. 34 studied the influence of moisture and temperature on properties of the composite sewing thread with identification codes 120 KShN KR-KA and 120 KShN KR-PrA. It was concluded that the composite sewing threads were strong enough to meet the needs of the finished product even if it was exposed to water or high temperature for a long time.…”