Question 39 (Textile Technology & Fibre Science)
Determine the correctness or otherwise of the following Assertion [a] and Reason [r].
[a]: In crease resistant finishing process of cotton with DMDHEU, curing is not carried out in steam
[r]: Steam causes DMDHEU to self-polymerise rather than crosslink cotton
|(A)||Both [a] and [r] are true and [r] is the correct reason for [a]|
|(B)||Both [a] and [r] are true and [r] is not the correct reason for [a]|
|(C)||Both [a] and [r] are false|
|(D)||[a] is true but [r] is false|
Option D is correct
Frequently Asked Questions | FAQs
What is DMDHEU ?
DMDHEU (Dimethylol dihydroxyethylene urea) is a chemical used in the textile industry as a crosslinking agent in the production of resins and adhesives. It is used to improve the properties of the final product, such as strength, durability, and resistance to moisture, chemicals, and other environmental factors. DMDHEU is often used in the production of high-performance textiles, such as sportswear and outdoor clothing, as well as in the production of industrial adhesives and coatings. In textile production, DMDHEU is added to the fibers during the finishing process, where it reacts with other chemicals to form a network of crosslinked fibers that provide increased strength and stability to the final product. The use of DMDHEU in textile production is regulated by various environmental and safety organizations, and it is important to follow appropriate safety precautions when handling this chemical.
What is crease resistance ?
Crease resistance is a property of fabrics and materials that refers to their ability to resist the formation of creases or wrinkles, even after repeated folding or bending. This property is important in the textile industry, especially for garments and textiles that are worn frequently, as creases can affect the appearance and drapability of the material. There are various ways to improve the crease resistance of a fabric, including the use of special finishes and treatments, the selection of appropriate fibers and yarns, and the control of the weaving or knitting process. For example, certain fibers, such as polyester and nylon, have good crease resistance due to their low moisture absorbency, while natural fibers, such as cotton and linen, tend to have poorer crease resistance. Additionally, certain finishes, such as those that increase the fabric’s elasticity, can also improve its crease resistance. The level of crease resistance required for a particular application will depend on the intended use of the fabric and the specific requirements of the end-user.