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Today I want to share with you about What is drafting in textile.
What is drafting in textile-Draft:
What is drafting in textile? Drafts are expressed in different ways, but the conventional definition is the ratio of the speed of the feed roller to the speed of the delivery roller. Judging by the relative speed, the speed of the delivery roller is always higher than the speed of the feed roller. However, the draft of the drawing frame refers to the difference between the delivery of the drafting zone and the speed of the feed roller. That is to say, drafting is to reduce the weight of the single length of the produced sliver by pulling the feed slices regularly and consistently to make them longer and thinner.
What is drafting in textile-Drafting:
Drafting is the process by which the weight of a single length is reduced by pulling the slivers regularly and evenly to reduce the weight of the unit length to prepare the next delivery sliver, roving, or yarn. The amount of drafting is usually the same as the number of times the carded sliver is fed to the drawing machine. As a result, the weight of the single length of the fed sliver is almost equal to the weight of the single length of the delivered sliver. The drafting method is to reduce the weight of the unit length of the product. For drafting in the drawing frame usually a pair of rollers work. The speed of the delivery pair roller is higher than the speed of the feed pair roller resulting in drafting.
Doubling is the process of getting 1 sliver delivered after two or more slivers are processed together in a machine. Usually, 1 sliver is delivered by feeding 7 or 8 slivers together in a drawing machine. Doubling here = 6: 1 or 8: 1.
By drafting the slivers 7 or 8 times regularly and evenly, 1 sliver is obtained by making it longer and thinner. The drafting method increases the irregularity of the sliver, but the double length of the sliver is re-adjusted to adjust the weight of the single length regularly and consistently. The doubling method reduces the irregularity of the sliver.
There are three types of drafts,
1. Mechanical draft
2. Actual draft
3. Tention draft