Theoretical and experimental study of color-alternation fancy yarns produced by a double-channel compact spinning machine

Abstract

The aim of this work is to explore a new method for producing color-alternation fancy yarn on a modified compact spinning machine. Color-alternation fancy yarn is a new kind of fancy yarn with varying color effects along the yarn axis. The modified compact spinning machine produces double-channel compact spinning, which has two coaxial back rollers in a drafting unit. In this spinning process, two different colored rovings are alternately fed into each back roller to produce alternant color effects along the yarn axis. The mean length of the connecting piece between of two different solid color pieces of this yarn is the key research subject. Mathematical equations have been derived to describe the relationship between the mean length of the connecting pieces, the mean length of the wedged broken end of roving, the mean overfeeding length of the roving and the total draft ratio. The effect of the total draft ratio and overfeeding length on yarn properties, such as tenacity, elongation and yarn evenness, was studied. The results indicate that a relatively small total draft ratio is beneficial to shorten the mean length of the connecting pieces, enhance the tensile property and improve yarn evenness.

Manufacturing a ring spun slub yarn using multi-channel drafting technique

“…By changing the drafting ratios of three rovings, it can manipulate the linear density and blending ratio of yarns. 2,3 The drive system comprises five servo motors designed as a nested structure, as shown in Figure 1 Servo motor 2 drives the apron roller, and servo motor 3 drives the middle roller. Servo motors [4][5][6] drive the three feeding rollers.…”

“…However, the blending ratio and linear density of the yarn are conventionally fixed in both methods, making them less useful for fabricating color blended spun yarns. Recently, progress has been achieved in rotor spinning and ring spinning by incorporating computer numerically controlled (CNC) systems into spinning machines, [1][2][3] thereby increasing the flexibility of yarn production. However, extensive experimental and analytical studies on CNC ring spinning machines, especially regarding the relationship between the manufacturing parameters and the yarn properties, have not been carried out yet.…”

Manufacturing Color-Blended Slub Yarn: Computer Numerically Controlled Ring-Spinning Frame and Kubelka-Munk Double Constant Theory

“…The computer numerically controlled (CNC) ring-spinning frame system implements the digital control technique into the ring-spinning frame, which controls the feeding speeds and yarn line density in real time. [1][2][3] The CNC ring-spinning frame can manufacture color-blended yarn based on three primary colors. The color blending effect of the yarn is given by the spiral arrangements of different colored fiber strands along the yarn axis.…”

A novel method of analyzing spinning tensions for yarn breakage detection in ring frame

“…17,18 For both types, a detector monitors the movement of the traveler, which provides the real-time dynamics of yarn tensions after processing the electronic signals with an A/D converter. However, it fails to detect the yarn breakage for the spun yarn that is formed through multi-channel drafting, [19][20][21] which consists of at least two rovings. The breakage of one roving cannot be picked up by the sensor.…”