Stretch break method and product

Abstract

A method for stretch breaking fibers to produce a staple yarn and operating a staple fiber spinning machine that enables the production of a plurality of products of lot size smaller than a large denier tow product. The process includes at least two break zones and a consolidation zone downstream from a second break zone to form a staple yarn. The filaments are broken in a second break zone downstream from the first break zone by increasing the speed of the fiber fed into the process.

Description

This application claims priority to provisional application Serial No. 60 / 139,096, entitled "Stripping Methods and Products," filed on June 14, 1999. technical field This invention relates generally to a fiber conversion and spinning process, and more particularly to a method of breaking continuous filament fibers into discontinuous filament fibers and consolidating the fibers into yarns. technical background The spinning of synthetic staple fibers has been produced by cutting the continuous filaments into staple fibers and then forming yarns in the same way as cotton or wool fibers. The simpler direct spinning process is also used, in which parallel continuous filaments are stretched and drawn to form a discrete strand between feed and delivery rolls in what is sometimes referred to as the stretch or takeoff zone , and then twisted to form spun yarns, such as disclosed in US 2,721,440 to New or US 2,784,458 to Preston. This early process was slow because it was limited b...

AI Technical Summary

Problems solved by technology

The problem with the product produced by Adams et al. is that 1.5-20% of the discontinuous filaments produced in a single breaking zone have a length of more than 76 cm and cause problems in further processing (mainly wrapping on rolls) ), especially when the selected process is not oriented vertically

This lack of control and the use of apron belts can limit the process rate to what it cites as 200 m / min, which is too slow for a commercial line of single low denier yarn

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