Dyeing & Printing-II question paper (WPE 441), 2018, from BUTEX affiliated colleges' Level-4 Term-I finals. Topics include dye aggregation, azoic dyeing steps, sulphur dye application, polyester-cotton blend dyeing, and grey scale fastness assessment.
Level-4 Term-I, Final Exám-2018
Subject: Dyeing & Printing-II (Code: WPE 441)
Time: 3.0 Hrs. Full Marks: 105
(Use separate answer script for Part: A and Part: B)
(All parts of a question must be answered consecutively)
Part: A
(Answer any three questions)
1. (a) Mention the different way of measurement of dye aggrigation.
(b) Write down the reasons of dye aggrigation in dye bath.
(c) Briefly describe the forces responsible for dye absorption.
(d) Mention the functional group of cotton, silk, wool, acrylic and viscose rayon fibre.
[4+5+6+2.5=17.5]
2. (a) What is diffusion number? What are the properties of a good carrier in dyeing of disperse dye?
(b) Give five commercial names of disperse dyes with manufacturer name.
(c) What are the methods available for dyeing polyester with disperse dyes? Describe the commercially most suitable one?
(d) State the different faults in dyeing.
[4+2.5+8+3=17.5]
3. (a) Why azoic color is called pigment and ice color?