Spinning yarn Weak twist means that the twist is lower than the normal value. After the spun yarn is broken, the strength of the yarn is insufficient and the splicing is difficult. The short pieces of yarn are in a state of small twist, commonly known as weak twist.
1. Several situations of weak twist 1. Oneness: Thick details caused by uneven drafting, during twisting During the process, the twist is concentrated in the details, and the twist in the thick places is small and the strength is low, or the details are too long, resulting in fragmented twist coefficients and low strength. The long details caused by roving result in insufficient twisting and low strength during the yarn forming process.
2. Entire single ingot:Single spindle failure, the whole yarn is thicker than normal yarn, this type of yarn may be accompanied by friction on the steel ring.
3. Entire unit:Produced by process errors.
From the actual production process, the biggest impact is one weak twist and The whole ingot is weakly twisted. If a weak twist in one place cannot be connected to the end, it will be a big concern for the lathe. The entire ingot is weakly twisted and will not rub the steel ring due to the forming, so it is not easy to be found and removed. This is the key task to control weak twist. Weak twist in the entire machine is not easy to occur and is easy to detect, and generally does not cause negative effects.
2.Dangers of weakly twisted yarn 1 strong drop;
2 produces a yellow-white file. The contrast is more obvious after color absorption;
3 repeated yarn breaks increase;
4Easy Produce grinding steel ring yarn;
5 Increased end breaks on knitting and weaving machines;
6 Weak twist is prone to hairiness;
7 Weak twist is prone to cotton balls (neps);
8 Use weakly twisted yarn as warp yarn. Due to the large amount of color absorption, warp length will occur. The sexual color meridian appears.
3.Uneven spindle speed is an important reason for uneven twist in yarn. Spindles Uneven speed is mainly caused by the difference in slippery rate between rollers, spindle conditions and spindle belt reels. The main factors affecting the slippery rate are the spindle belt tension, the quality of the inner and outer layers of the spindle belt, the taper of the spindle tip and the spindle disk. The difference in diameter and the lubrication conditions of the spindle.
4.The relationship between spindle belt length and spindle belt tension on spindle speed Effect: If the belt tension is large, the slippage rate between the spindle belt and the roller plate is small, and the slippery rate between the spindle plate and the spindle belt is also small, the spindle speed is high, so the twist of the yarn is large. On the contrary, the yarn twist is small.
The effect of the length of the spindle tape on the tension of the spindle tape：The longer the spindle tape is, the smaller the tension of the spindle tape will be. If it is short, the spindle belt tension will be high. If the spindle belt lengths of the spinning frame and the twisting machine on the same machine are inconsistent, it will cause a large difference in the tension of the spindle belts on the same machine, resulting in uneven spindle speeds on the same machine, which will affect the uneven twist of the yarn. The spindle tape has poor lap, twisted and damaged burrs, excessive fly flakes adhere to the spindle tape, oil stains on the spindle, etc., causing the spindle and the spindle tape reel to rotate inflexibly, beating, etc., all of which will affect the twist unevenness of the yarn. produce a certain degree of impact.
5.Poor contact between the spindle and the bobbin, the inner hole at the top of the bobbin is worn or not round, Too light weight, bent spindle rod and unstable spindle operation will cause the bobbin to skip or ‘invisible bobbin’ during operation, causing the yarn twist unevenness to rise.
6.Due to a weak sense of work responsibility and lax management of the workshop laboratory, the wrong number of twist conversion teeth is used , resulting in a large number of strong and weak twisted yarns, that is, wrongly twisted yarns.
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6.Due to a weak sense of work responsibility and lax management of the workshop laboratory, the wrong number of twist conversion teeth is used , resulting in a large number of strong and weak twisted yarns, that is, wrongly twisted yarns.
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