A theoretical calculation is made to simulate the effect of drafting upon the sliver irregularity in two-zone drafting of three-over-three roller system. Two types of slivers, i.e., random sliver and optional sliver are considered. The effects of sliver count, staple fiber length, fineness of fiber, draft distribution between two drafting zones, maximal moving distance and distribution type of ...

During the 2003-2008 school years, a multi-drafting teaching method was tried and formalized in a rural college in Israel using the HighLearn MCL web-based environment. The aim of the current study was to determine the influence of procrastination and anxiety on students’ attitudes toward multi-drafting teaching methods. The research was based on three self-evident questionnaires: (1) Multi-dra...

A recent experiment has shown “inverted drafting” in flags: the drag force on one flag is increased by excitation from the wake of another. Here we use vortex sheet simulations to show that inverted drafting occurs when the flag wakes add coherently to form strong vortices. By contrast, normal drafting occurs for higher-frequency oscillations, when the vortex wake becomes more complex and mixed...