Question 32 (Textile Engineering & Fibre Science)
Pressure field from the nip of drafting roller can be extended by
|(A)||Reducing roller pressure and increasing hardness of top roller|
|(B)||Reducing mass of fibre strands and reducing roller diameter|
|(C)||Increasing roller diameter and increasing roller pressure|
|(D)||Increasing width of fibre strand and increasing hardness of top roller|
Option C is correct
Frequently Asked Questions | FAQs
What is the drafting pressure of ring frame?
The drafting pressure in a ring frame, which is a type of spinning machine used to produce yarn, refers to the pressure exerted on the yarn during the drafting process. It is commonly expressed in units of grams per tex (g/tex) or grams per kilogram (g/kg). The drafting pressure is determined by various factors, including the type of fiber being processed, the desired yarn characteristics, and the specific settings of the ring frame.
The drafting process in a ring frame involves passing the fiber bundle through a series of rollers, known as drafting rollers, which progressively reduce the thickness and increase the length of the fiber bundle. The pressure exerted by these rollers determines the extent of fiber attenuation and yarn thickness control. The drafting pressure must strike a balance between achieving the desired yarn characteristics, such as fineness and strength, while avoiding excessive fiber breakage or other quality issues.
The specific drafting pressure used in a ring frame can vary depending on several factors, including the fiber type, fiber properties (such as length, fineness, and strength), the desired yarn count, and the spinning conditions. Typically, the drafting pressure for ring spinning can range from around 1 g/tex to 10 g/tex, but these values can vary depending on the specific requirements and equipment settings.
It is important to note that the drafting pressure is just one aspect of the overall drafting process in ring spinning. Other parameters, such as the draft ratio (the ratio of input fiber length to output yarn length) and the number of drafting stages, also play crucial roles in determining the yarn characteristics. Additionally, the drafting pressure may be adjusted during spinning to optimize yarn quality and performance based on specific fiber and process conditions.