Dyeing and Printing-II paper (WPE 441) from 2016 Level-4 Term-I finals, BUTEX affiliated colleges, 105 marks. Questions examine pore and free volume diffusion models, adsorption isotherms, disperse dyeing of polyester, and carrier properties.
Level-4 Term-I, Final Exám-2016
Subject: Dyeing and 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) Differentiate between pore model and free volume model of diffusion in dyeing process.
(b) What are the roles of functional groups present in the following fibers in dye-fiber interaction? (i) Polyamide (ii) Cellulose (iii) Polyesters.
(c) What is adsorption isotherm? Discuss 'diffusion co-efficient' and Langmuir adsorption isotherm.
(d) State the reasons for aggregation of dyes in solution and how it can be solved.
[4+3+5+5.5=17.5]
2. (a) Define substantively, affinity, exhaustion and migration of dyes.
(b) What are the possible ways for anchoring of dyes with fibres?
(c) Briefly discuss about the causes of dye aggregation.
[6+3.5+8=17.5]