A study of influence of the delivery rubber roller on yarn properties

Abstract

In this study, a mechanical model was introduced to analyze the hair wrapping via a contact surface in the yarn formation zone. Worsted and ramie/cotton rovings were then used to produce yarns on an experimental ring frame with and without a delivery rubber roller to validate the theoretical analysis. Yarn properties, including hairiness, unevenness, and tensile properties were tested and the results indicated that the delivery roller could stop fibers from escaping from the twisting process in the spinning triangle and wrap most of them onto the stem of the yarn. In particular for worsted spinning, yarn unevenness CV, as well as tensile properties, was improved significantly due to an improved arrangement of the worsted strand when using the front delivery rubber roller. However, yarn evenness and tensile properties deteriorated for ramie/cotton yarn spun with a delivery rubber roller. This was mainly because of the high modulus of the ramie/cotton blend strand, as upstream twists were blocked and a weak spinning zone was formed to incur an unexpected drawing.

Processing and characterization of phosphate glass fiber/polylactic acid commingled yarn composites for commercial production

“…Fiber damage was clearly observed on the surface of the commingled textiles, as shown in Figure 2. The breakages of reinforcing fibers were mainly caused by the applied twist on the yarn and the abrasion between yarns and weaving machine components during the production of both yarns and textiles 44,45 …”

An analogical method for evaluating ring performance based on quality and production parameters

“…To balance or minimize yarn residual torque in one step, Xu et al added optional fiber separation devices and a fake twist device to the traditional ring spinning frame [ 9 ]. The delivery roller could prevent fibers from escaping from the twisting process in the spinning triangle and wrap most of them onto the stem of the yarn, according to research by Xia et al who created yarn samples on an experimental ring frame with and without delivery rollers and examined yarn qualities [ 10 ]. Adding a fake twister mechanism to traditional ring-spinning machines has been the subject of numerous investigations [ 11 , 12 ].…”