The main part of this paper is devoted to roller drafting using means based on the investigations of Grishin and Foster. The generalization of Grishin's method is called the “drafting-field method” and the generalized work of Foster the “two-velocity model method”. In the steady state of fibre motion, it has been proved that Grishin's work gives the same results as Foster's when the distribution function ρ(x) is introduced. A value of ρ(x), determined semi-experimentally, gives a draft curve in good agreement with that found by calculation.
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Goto et al. (1957) studied this question.
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