Question 13 (Textile Engineering & Fibre Science)
Probability of warp breakage during weaving increases, when
|(A)||Warp extensibility is decreased|
|(B)||Warp unevenness is decreased|
|(C)||End density is decreased|
|(D)||Warp hairiness is decreased|
Frequently Asked Questions | FAQs
What are the process of weaving?
Weaving is a process of creating fabric by interlacing two sets of yarns at right angles to each other. The following are the basic steps involved in the weaving process:
Shedding: The first step is to create an opening or “shed” in the warp yarns. This is done by raising some of the warp threads with a harness or a shaft. The raised warp threads create an opening through which the weft yarns can be inserted.
Picking: The weft yarn is then inserted through the shed using a shuttle, rapier, air jet, or water jet, depending on the type of loom. The weft yarn is passed through the opening in the warp yarns, from one side of the fabric to the other.
Beating-up: The next step is to beat the weft yarn into place using a comb-like tool called a reed. The reed pushes the weft yarn firmly against the previous row of weft yarns, creating a tight, compact fabric.
Take-up: The fabric is then wound onto the cloth beam, which pulls the fabric forward as it is woven. The warp yarns are wound onto the warp beam at the same time, creating tension that helps to keep the fabric tight and stable.
Repeat: The process is repeated, with the harness or shaft raising different warp threads to create a new shed for the next row of weft yarns. This process is repeated until the desired length of fabric is woven.
Finishing: The final step is to finish the fabric, which may include processes such as washing, dyeing, printing, or adding texture.
The exact steps in the weaving process can vary depending on the type of loom, the type of yarns used, and the desired end product. However, the basic principles of shedding, picking, beating-up, and take-up are common to all weaving processes.
Warp breakage and warp extensibility are two important properties that are related to the strength and durability of woven fabrics. There is an inverse relationship between warp breakage and warp extensibility, meaning that fabrics with high warp extensibility are more prone to warp breakage and vice versa.
Warp breakage refers to the breaking of the warp yarns during weaving. This can be caused by a variety of factors such as tension, abrasion, or defects in the yarn. Fabrics with high warp breakage are weaker and less durable.
Warp extensibility, on the other hand, refers to the ability of the warp yarns to stretch or elongate under tension. Fabrics with high warp extensibility are more elastic and have greater dimensional stability.
The relationship between warp breakage and warp extensibility is related to the tension that the warp yarns are under during weaving. If the warp yarns are under too much tension, they are more likely to break. However, if the tension is too low, the fabric may become distorted or have other defects.
Therefore, it is important to balance the tension and extensibility of the warp yarns during weaving to prevent warp breakage and ensure a strong and durable fabric. Fabric designers and manufacturers must carefully consider the properties of the fibers, yarns, and weaving process to achieve the desired balance between warp breakage and warp extensibility.