A Study on the Temperature Dependency of the Frictional Property at Withdrawing a Fine Metal Wire from a Acrillic Fiber Bundle

Abstract

In recent years, with development of the draft-theory, it was known that the withdrawal friction was one of very important factors for analyzing draft-force. Therefore, many investigators inquired into the dependency of the withdrawal friction on pressure and material. However, it was scarecely done for the temperature dependency on the withdrawal friction.Accordingly in this study, the withdrawal frictional force at withdrawing a fine metal wire from a acrillic fiber bundle was measured at temperature from 20°C to 120°C, and we obtained the following conclusions ;(1) The volume ratio (real volume of fibers/apparent volume of fiber bundle) of acrillic fiber bundles exponentially increased with increase of pressure, and increased with the rise of temperature up to 80°C, then rapidly swinged upward at temperature from 80°C to 100°C and scarecely changed beyond 100°C.(2) On the conditions of measurement in this study, the property of the withdrawal friction for acrillic fiber bundles is expressed by the following formula;fp =log (Kta) (P/√ξ) βwhere P is pressure (g/cm2), fp is withdrawal frictional force at pressure P (g/cm), β is constant, ξ is volume ratio, t is temperature (°C) and K, α are constants determined by the measured temperature range.