Abstract
Drafting process has been assumed to be a stationary process. The purpose of this paper is to clarify whether the drafting process is a stationary process. The short-term thickness irregularity of a sample yarn has been measured by an evenness tester and the auto correlative function R(τ) calculated.The exact form of the function R(τ) can be obtained by taking infinite length of yarn, but the sample length being finite, the value of R(τ) varies. To solve a problem-whether the variation of R(τ) observed in finite length of sample is dependent upon nonstationary characteristics of the mechanism to produce drafting irregularity or just upon error caused by statistical variations observed even if the process is stationary, the authors have compared the observed results with theoretical values, and also compared the results thus obtained with the irregularities obtained by spinning simulator. This simulator includes an analogical circuit of stationary drafting process. The conclusions are as follows:1. Short term thickness irregularity (the wave length of less than 10 times the mean fiber length) caused by drafting process is considered to be stationary. This means that the drafting process has stationary characteristics.2. This also implies that R(τ) can be calculated by long length of sample without taking no care of missing the true characteristics of drafting process.
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