Abstract:

In order to explain the additional twist phenomenon of the compacted spinning and the contradiction with the classical non-open end twisting theory, the core structure of the open-end fibers and non-open-end fibers of the main body was proposed. The three-dimensional digital microscope was used to observe the structural differences between the compact spun yarn and the ring spun yarn after the untwisting, which indicated that the core structure of the fibers in the condensing area is reasonable. The fibers samples in the condensing area were observed using the microscope, and a phenomenon in which the non-open-end fibers were wrapped by the open- end fibers was found. Hereby, the semi-open end twisting model of the fibers in condensing zone was established, that is, the negative pressure acts on the non-open end fiber of the main body via the lattice apron, the negative pressure and the collecting groove in combination to apply the open end fibers twisting effect on the main fibers. The formation of the core structure of condensing fibers results in the additional twist, which provides a theoretical basis for the condensing mechanism..

Key words: compact spinning, semi-open end twisting, core structure, condensing mechanism