In spinning process; winding are the last steps. After winding yarn packages are used for making woven or knitted fabrics. Winding process can be defined as the transfer of spinning yarn from one package to another large package (cone, spool, pirn etc). On the other hand it can be defined as the transfer of yarn from ring bobbin, hanks etc into a convenient form of package containing considerable long length of yarn. A process of accumulating yarn on a package to facilitate the next process is called as winding.
Objectives of winding: Winding process has some objectives which are given as below:
- To transfer yarn from spinning bobbin package to a convenient yarn package.
- To improve the quality of yarn.
- To get suitable yarn package.
- To get a quality fabric.
- To get good warp yarn.
- To empty the spinner’s bobbin so that it can be used again.
- To remove dust and clean the yarn.
- To reduce labor cost.
- To store the yarn.
- To improve the efficiency of yarn for next process.
Requirements of winding: Winding process should be accurate for accelarate the next fabric manufacturing process. Winding process should fulfill the following requirements.
- Winding process should be easy.
- Characteristics of the yarn should not be changed.
- Winding faults should be minimize.
- Yarn package size and shape should be suitable.
- Winding process should be economical.
- Yarn package should be cheap in cost.
- Avoid excess looseness or tightness.
- Exact package hardness.
- In winding, yarn knots should be small in size and amount of knots should be minimum.
So, that’s all about winding process and objectives and requirements of winding.
In fabric manufacturing technology, three types of fabrics are produced they are woven, knitted and non-woven fabric. We know that; weaving is done for producing woven fabric. Before weaving various types of tasks are done. After spinning process; yarns are divided into two forms one is warp yarn another is weft yarn. Warp yarns are produced by roll winding and weft yarns are produced by cop winding.
Process flow chart of weaving technology: I like to divide this process into two parts one is weavers beam preparation another is weft yarn preparation. Weaving is done by the interlacement of these two types of yarn. Process flow chart of weaving technology is given below:
Spinning bobbin for winding
Roll winding for spool production
Warp yarn preparation
Cone winding or pre-winding
Drafting in or Drawing in
Weaving (Interlacement of warp and weft yarn)
Above weaving flow chart is mostly used for cotton and jute fabric. Although these techniques vary depending on the machine which is used for producing fabric but basic concept is same.
In woven fabric manufacturing technology two types of yarns are used they are warp and weft yarn. But in knit fabric manufacturing one set of yarns are used. The yarn which is placed in the longitudinal direction of a woven fabric is called warp yarn. Warp yarn is used for make a weaving beam. The yarn which is used for cross interlacement through the warp beam is called weft yarn. Warp yarn count is finer than the weft yarn count.
Warp yarn should have various qualities which ensure the quality of fabric. Number of warp yarn which is used for making a specific fabric that is fixed by the calculation of fabric construction. Following properties should have a warp yarn; they are as follows:
- Cross section of the warp yarn should be uniform.
- Warp yarn should be sufficiently and uniformly strong.
- Warp yarn should be less hairy.
- Warp yarn must be dust free and clean.
- Knots of a warp yarn should be minimum.
- Application of size materials on warp yarn should be standard and knots must be proper otherwise warp yarn face difficulties during passing into the eye.
- Arrangement of warp yarn in the weavers beam should be parallel.
- Warp yarn should be free from naps, slubs and loose fiber.
- Tension of warp yarn in the weavers beam should be uniform.
So, when we will select warp yarn we should remember the above properties of warp yarn. After making weavers beam, it becomes ready for fabric production. It is note that; woven fabrics may be colored or in grey form. Grey fabrics send for dyeing if needed.