Question 28 (Textile Engineering & Fibre Science)
Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]
Assertion : The spinning speed in melt spinning process are higher than that of wet spinning process.
Reason : The solidification of melt involves only heat transfer, whereas in wet spinning one way mass transfer is also involved.
|(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|
Frequently Asked Questions | FAQs
What is the principle of melt spinning?
Melt spinning is a process used to produce synthetic fibers, in which the polymer is melted and then extruded through a spinneret to form a continuous filament. The principle of melt spinning can be summarized as follows:
Polymer Melting: The polymer is first melted in an extruder, which is a machine that heats and melts the polymer pellets or chips to a controlled temperature.
Spinneret: The molten polymer is then forced through a spinneret, which is a plate with small holes or orifices. The shape and size of the orifices determine the shape and size of the resulting fibers.
Quenching: The filaments exiting the spinneret pass through a quenching zone where they are rapidly cooled by air or water. This solidifies the molten polymer and forms a continuous filament.
Take-up: The solidified filaments are then wound onto a spool or bobbin at a controlled speed. The take-up speed determines the linear density (denier) of the resulting fiber.
The melt spinning process can be used to produce a wide range of synthetic fibers, including polyester, nylon, and polypropylene. The properties of the resulting fiber can be controlled by adjusting the processing conditions, such as the temperature and rate of polymer melting, the spinneret design, and the quenching method. Melt spinning is a highly versatile and efficient method for producing synthetic fibers, and it is widely used in the textile and other industries.
What are the advantages of wet spinning?
Wet spinning is a process used to produce synthetic fibers, in which the polymer is dissolved in a solvent and then extruded through a spinneret into a coagulation bath. Wet spinning has several advantages compared to other spinning processes:
Production of High-Quality Fibers: Wet spinning produces high-quality fibers with excellent physical properties, such as strength, elasticity, and durability. The fibers produced by wet spinning are also less likely to have defects or irregularities, making them suitable for a wide range of textile applications.
Control of Fiber Properties: The properties of the resulting fibers can be easily controlled and modified by adjusting the composition of the spinning solution, the spinning conditions, and the coagulation bath. This allows for the production of fibers with specific characteristics, such as high tenacity, low elongation, or high modulus.
Production of Specialty Fibers: Wet spinning is suitable for the production of specialty fibers, such as aramid fibers, carbon fibers, and cellulose acetate fibers. These fibers have unique properties that make them useful in a wide range of applications, including aerospace, automotive, and medical industries.
Economical and Scalable: Wet spinning is a relatively economical and scalable process, as it does not require high temperatures or complex equipment. This makes it suitable for mass production of synthetic fibers for a wide range of textile applications.
Overall, wet spinning is a highly versatile and efficient method for producing synthetic fibers, and it offers several advantages compared to other spinning processes.