2013 Annual Report
1a.Objectives (from AD-416):
To determine lint cleaner settings or design parameters that will.
1)improve the removal of seed coat fragments from the lint,.
2)possibly allow separation of small seeds that pass through the gin ribs from the primary waste stream,.
3)reduce short fiber content, and.
4)reduce nep content. Related to seed coat fragments, this project will also work to document the ability of a cottonseed shear tester to rank varieties in terms of their potential to form seed coat fragments.
1b.Approach (from AD-416):
Some recently released cultivars have a fragile seed coat that breaks easily during harvesting and gin processing, and contaminates the lint with fragments of seed coat material. Seed coat fragments cause major problems at the textile mill. Because the cultivars are relatively new, there is no current research on their interactions with harvesting and gin processing. Current research will attempt to remove seed coat fragments, and improve fiber quality attributes such as short fiber content and neps, with newly designed lint cleaner grid bars, a newly designed lint cleaner air-knife grid bar, or newly designed pneumatic fractionator in place of the saw-type lint cleaner. ARS brings to the collaboration scientists and research ginning facilities, while Cotton Incorporated brings scientists and fiber test facilities. Both organizations will gain a better understanding of interactions between seed coat fragments and gin processing. It is hoped that this research will provide domestic and international textile mills with a better quality fiber.
Five experimental grid bar designs were tested to evaluate their ability to remove seed coat fragments from ginned lint with newly designed lint cleaner grid bars. Two types of cotton were used, a common upland cultivar and a cultivar known to have a fragile seed coat that breaks easily and contaminates lint with seed coat fragments. Results showed noticeable differences in fiber properties between the cultivars. Fiber from the fragile cultivar was shorter, less uniform, and contained more short fibers, neps, and seed coat neps. However, there were very few differences in fiber properties, particularly seed coat fragments, among the grid bar designs. The results of this study were presented at the 2013 Beltwide Cotton Conferences. This RCA is a continuation of research from 2012 and was continued by project 6235-41000-008-49R. This research will be the basis for a future journal publication. This will serve as a final report.