mbt italia Quality Control of yarn _1451

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Quality Control of yarn

measured. Weshouldconsidersomethingonyarnqualitycontro1. Keywords: Yarn; evenness some yarn manufacturer that as long as they produce yarn for all the quality indicators are located in the \. But things are not so simple, we can and must be considered from a different point of view this issue. First, the production of this yarn is practically impossible. Maybe we can use specially selected materials, even at low speed and low 牵伸 multiples spinning, but we must take into account the other hand, this production is not only inefficient, expensive, and the production of yarn in this way line can have much business, social and economic value will be controversial, this is not the pursuit of today's high-tech era of products, our goal is to produce a reasonable price good enough product. We produce the yarns are some specific uses, so during the process design, based on the yarns for different purposes (such as weaving yarns, knitted yarn, sewing thread, yarn, cloth bleaching yarn, calico yarn, civil and industrial use, etc.), and according to raw materials and spinning equipment used in the actual situation, the measured re-consider the key quality indicators, rather than the blind pursuit of high standards for all indicators. Under normal production conditions, quality is not some kind of yarn in various indicators are the best. Shiji Shang, a certain kind of yarn is the best in strength, but may only have an average level of elongation; and Ling a uniform yarn evenness index may be less than 5% of the level boundaries, and Mian Results are in line with the 50% level, in any case these should be considered a good yarn. Important question is not sufficient to determine the average yarn is good or bad, play a major role in the uniformity of the yarn, that is, all the cop on the quality indicators in each phase should be close as possible . We can see from some test data to draw some conclusions. 30 samples for the cotton carded yarn,[link widoczny dla zalogowanych], from 1O very close to a measurement data can be drawn from an average cop (about 18.5%), from another group of samples matched by exactly the same average (about 18.5%), but in these samples,[link widoczny dla zalogowanych], some cop test data are particularly high. While some cop is particularly low (Figure 1). No doubt, the user needs is the main quality indicators within the control of a ~ yarn, this range may be located in \More user requirements,[link widoczny dla zalogowanych], but the uniformity of the yarn, requires that all of the cop as consistent as possible, the only way to effectively produce the user to minimize the level of defective products. 4 2000 textile spinning mill in Heilongjiang in the use of Uster yarn quality control, can not be satisfied at or better than the average of the indicators required by the indicators, and to attach great importance to those outside the scope of value. Yarn spinning plant proposed during the test tube, be sure to keep track spindle position, setting cycle plan, while the completion of the experimental data for periodic testing of the spindles, so that the exception for those reasons timely analysis of cop, take the necessary measures . Factory conditions of such plans can also be extended to the roving,[link widoczny dla zalogowanych], the coarse and fine spindles spindles correspond, even if only the number corresponding to the station is also necessary at the same time also pay attention to the following five main areas: (1) and the decapitation Yarn should be able to fly at high speed running on the device without causing breakage of high efficiency and functionality of the machine fly. (2) the appearance quality should be using this yarn to produce products with good appearance properties, that is, from product appearance, yarn quality is in line with requirements. (3) demand for each yarn quality index should have an acceptable average level, this level is not necessarily in line with the level of 25%, and may be on the line at a higher level. (4) Variation of uniformity cop should reach the minimum, and maintain long-term change. (5) determine the quality of the user,[link widoczny dla zalogowanych], the average level in the \line might be the best yarn, yarn, even if the average level of such \Prince Yu a bid out of the test statistics for all 10 batches yarn yarn cV% control value. On the average of the next two prince Yu was about 18.5%. The figure is even yarn approved, under the management plan there is a big variation. Received date :2000-03-26
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