Draw Frame Operation and Sliver Variation
The draw frame is a crucial machine in textile spinning that processes sliver to improve uniformity and parallelism of fibers. It works by drafting the sliver, reducing its thickness while increasing its length.
A key function of the draw frame is to reduce the inherent variability (mass variation) in the input sliver. This is typically achieved by feeding multiple slivers (ends) together.
Limiting Input Ends Due to Mass Variation
The number of sliver ends fed into the draw frame is limited primarily to manage the consistency of the output sliver. If the sliver being processed already has significant or increasing mass variation, feeding too many ends can lead to:
- Compounded variability in the output.
- Difficulty in achieving the desired level of uniformity.
- Potential processing issues downstream (e.g., in spinning).
Therefore, an increase in the mass variation of the sliver processed by the draw frame necessitates limiting the number of input ends to maintain control over the final sliver quality and prevent excessive non-uniformity.
Similar Questions
- The major constituent of cotton fibre is _________.
- The acrylic fibre is manufactured by wet spinning process rather than melt spinning process due to ________ of acrylic polymer.
- The Scanning Electron Microscopy (SEM) gives the ________ features of material.
- The glass transition temperature of polyethylene polymer is low in comparison with that of polypropylene fibre because of ________ molecular chain of polyethylene.
- The polyester (PET) fibre spun by high speed spinning technology shows high crystalline orientation but low birefringence due to ________.
- The main objective of drawing of synthetic fibre is to impart the molecular ________ along the fibre axis.
- On mercerization, the strength and moisture absorption capacity of cotton fibre increases. The reason for increase is ________.
- The glass marbles are subjected to melting process at the temperature of ________ before feeding to spinneret for its spinning.
- The primary purpose of ginning process is to ________.
- The chute feed system is beneficial over the formation of lap due to ________.
Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
