Production process of burnt out fabric

(1) Selection of raw materials
① Selection of wrapping fiber: raw cotton and rayon are Weisu fiber, which are ideal raw materials for spinning core spun yarn. The selected raw cotton length should not be too long, the strength should not be too high, but the neps and impurities should be less. In dyeing and finishing process, it is unnecessary to remove impurities with strong alkali, so as to avoid affecting the luster and strength of polyester filament. In this way, the quality of core spun yarn will not be affected, the production cost can be reduced, and the proportion of cotton wrapped can be adjusted easily. It is better to choose man-made cotton as the outer covering fiber, with low fiber strength, easier adjustment of wrapped fiber ratio, less neps and impurities, and better dyeing performance.
② For the selection of core spun yarn, polyester filament is the best choice for core spun yarn. For example, nylon yarn has good wear resistance but poor stiffness. The size of polyester filament and the number of monofilament, as well as whether the filament is bright or not, should be selected according to the thickness and use of burnt out fabric. For weaving thin burnt out fabrics, such as clothing, handkerchief, sofa cover, etc., the thinner filament below 45 denier is generally selected; the thicker burnt out fabric, such as tablecloth, curtain, bedspread, etc., can be woven with thicker filament of more than 68 denier. The number of monofilaments in the filament depends on the thickness of the monofilament. For the filament of the same size, the more the number of monofilament is, the thinner the monofilament is, and the product is soft and smooth; the less the number of monofilament, the product has good rigidity and stiffness, and the style of the product has its own characteristics. Therefore, it can be selected according to the use of the product; as for the bright and dull filament, the bright filament product has good luster, but it is easy to cause aurora After twisting, the luster of the product is dark but soft. In field production. Semi smooth filament is usually used as filament for burnt out fabric.
(2) The core spun yarn used for spinning burnt out fabric is spun on ordinary spinning frame. Taking the polyester cotton core spun yarn which is widely used at present as an example, it uses polyester filament as the core yarn and is covered with compound cotton fiber. During spinning, a filament introduction device is installed on the ordinary spinning frame to introduce polyester filament into the front roller and mix with cotton sliver for twisting. Polyester filament becomes the twisting axis, while cotton fiber revolves around polyester filament to form core spun yarn.
(3) Appearance quality requirements of core spun yarn
The appearance quality of core spun yarn used for weaving burnt out fabric should be strictly prevented from the following defects:
① Double core yarn: refers to the double core yarn made by feeding two polyester filaments. It is mainly caused by the floating head of the filament near the spinning spindle, resulting in the feeding of two long filaments, which are not found in the joint of the shift lathe workers, or are not pulled clean even though they are found. This kind of situation is more likely to happen when there is no tension device for filament.
② Peeling yarn: mainly refers to the cotton fiber covering rate is too small. The reason is that the opening of the cotton collector is too small, the drafting parts fail, the spindle is seriously skewed, the bead is worn too much and it is not replaced in time.
③ Bead yarn: refers to the process of spinning, due to the filament channel is not smooth, such as guide hook, cotton collector groove, the filament is pulled and beaten, or the filament comes out of the cotton collector, due to the excessive tension of the filament, intermittent beating and other reasons.
④ Poor coating: refers to the core spun yarn with partial length. Polyester filament is wrapped in the outer layer of core spun yarn, but not cotton fiber. It is mainly caused by the broken ends of the empty roving or polyamide fiber and the continuous coiling of the filament during the spinning process, but the defective wrapped yarn is not pulled clean when the car stopper joins.
⑤ Core broken yarn: it refers to that there is no filament in the core spun yarn, only cotton fiber is mixed in. Although this kind of situation rarely occurs, once it occurs, it will cause great harm. In particular, when this kind of yarn is used as warp yarn, the cotton fiber will be completely rotten after printing and dyeing, which will cause a large number of warp missing and degraded fabrics.
⑥ Uneven packing: the causes of uneven packing are mainly caused by uneven tension during filament feeding and uneven roving evenness. A tension plate is installed on the filament feeding device to unify the filament tension and improve the roving evenness.

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