Abstract:

Objective In order to improve the accuracy of the blending ratio of various fibers in multi-fiber combed yarns, a mathematical model of the feeding ratio of fiber rolls in combing machines was established and validated experimentally. The "yarn cross-section fiber counting method" is proposed to determine the actual ratio of various fibers in blended yarns for improving the detection efficiency. This study provides an accurate and effective method for the determination of various fiber blending ratios in fiber rolls and the detection of various fiber blending ratios in blended yarns during multi-fiber blending and combing.

Method Tests were conducted for each type of single-component fiber rolls to determine the amount of fiber loss during combing. Based on the balance relationship among the fiber layer feed-in amount, fiber loss amount, and fiber web output amount during the combing process, a mathematical model was established for determining the feed ratio of combed fiber rolls. Using polyester, cotton, and viscose fibers at a designed blend ratio of 40∶30∶30, the fibers were blended and then combed before being spun into yarn. This study designed the spinning process flow, fiber blending methods, multi-fiber combing techniques, as well as the corresponding process parameters. Multi-fiber combed yarns were spun, and cross-sectional slices of the yarn were prepared. The actual blend ratio of the blended yarn was determined using the yarn cross-section fiber counting method.

Results The multifiber combed fiber roll casting ratio model was applied to determine the actual blending ratio using the statistical method of the number of fiber in the yarn cross-section. The actual measurement results showed that the contents of polyester, cotton, and viscose in the blended yarn were 39.21%, 31.48%, and 29.31%, respectively. The difference rates from the designed blend ratio were 1.98%, 4.93%, and 2.30%, respectively, which fell within the control range specified by national standards. The conventional physical method took 220 min to detect the actual blend ratio. By adopting the manual cross-section fiber counting method, the total testing time was approximately 150 min, a 46.7% increase in efficiency compared to the conventional physical testing method.

Conclusion Multi-fiber combed fiber roll feeding ratio of the mathematical model was proved to be useful in production practice and the ″yarn cross-section fiber counting method″ was shown operatable in determining the actual blend ratio of various fibers for multi-fiber blended yarns with convenience, fast speed and accuracy.

Key words: blended combed roll, blending ratio, feeding ratio mathematical modeling, combed yarn quality, measurement method for yarn blend ratio