Interview questions for Wet processing - (Part 3)
.jpg "Interview questions for Wet processing - (Part 3)") |
| Interview questions for Wet processing - (Part 3) |
51. What is ETP?
Ans : Effluent treatment plan.
52. What is substantively?
Ans: The rate of dye transfer from the dye solution to the
textile material, also the distribution of dye molecules in the
textile material.
53. What happened for deep shade?
Ans: Fastness properties of dye increased and decreased of
washing fastness.
54. What is affinity?
Ans: The attraction of dyes to the textile material.
55. What is color strike?
Ans: Intial exhaustion on the fibre in a dye bath.
56. What is exhaustion?
Ans: It is the process when adsorption, sorption and
desorption completed then total dye molecules enters into
fibre.
57. What is adsorption?
Ans: It is the process when dye molecules cime to the
surface of the fibre.
58. What is sorption?
Ans: It is the process when dye molecules enter into the
fibre.
59. What is desorption?
Ans: The proocess by which the dye molecules come out
from the inner side of the textile material in particular
condition (mil, time, temple).
60. What is fixation?
Ans: After washing which amount of dyes are contact with
the fibre.
61. Is the pigment water soluble?
Ans: Pigment is 100% water insoluble.
62. What is reactive dye?
Ans: Dye that reacts with the textile fiber to produce both a
hydroxyl and an oxygen linkage, the chlorine combining with
the hydroxyl to form a strong ether linkage; gives fast,
brilliant colors.
63. With which fibre reactive dye maninly react?
Ans: Cellulose fibre.
64. Why reactive dye is so called?
Ans: Reactive dye contain reactive group and this reactive
group makes covalent bonds with the fibres and becomes
part of the fibre, thats why it is so called.
Ans : Effluent treatment plan.
52. What is substantively?
Ans: The rate of dye transfer from the dye solution to the
textile material, also the distribution of dye molecules in the
textile material.
53. What happened for deep shade?
Ans: Fastness properties of dye increased and decreased of
washing fastness.
54. What is affinity?
Ans: The attraction of dyes to the textile material.
55. What is color strike?
Ans: Intial exhaustion on the fibre in a dye bath.
56. What is exhaustion?
Ans: It is the process when adsorption, sorption and
desorption completed then total dye molecules enters into
fibre.
57. What is adsorption?
Ans: It is the process when dye molecules cime to the
surface of the fibre.
58. What is sorption?
Ans: It is the process when dye molecules enter into the
fibre.
59. What is desorption?
Ans: The proocess by which the dye molecules come out
from the inner side of the textile material in particular
condition (mil, time, temple).
60. What is fixation?
Ans: After washing which amount of dyes are contact with
the fibre.
61. Is the pigment water soluble?
Ans: Pigment is 100% water insoluble.
62. What is reactive dye?
Ans: Dye that reacts with the textile fiber to produce both a
hydroxyl and an oxygen linkage, the chlorine combining with
the hydroxyl to form a strong ether linkage; gives fast,
brilliant colors.
63. With which fibre reactive dye maninly react?
Ans: Cellulose fibre.
64. Why reactive dye is so called?
Ans: Reactive dye contain reactive group and this reactive
group makes covalent bonds with the fibres and becomes
part of the fibre, thats why it is so called.
65. What is the general formula of reactive dye?
General formula of reactive dye
Where , R= Chromophore, C= Cellulose.
66. Why reactive dyes popular?
Ans: Good washing fastness, good light shade, lower cost,
easier method etc.
67. Which parameter reactive group do not contribute?
Ans: Color, which is determined by chromogen group.
68. What is the reaction between reactive and cellulose
fibre?
Ans:
Reaction between reactive and cellulose fiber
69. What is the relation between vinyl sulhone group and
halogen group?
Ans: The reactivity of vinyl sulhone group is less than
halogen group.
70. If no reactive group increase then what happened?
Ans: Binding also increase depending on dye structure.
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| Interview questions for Wet processing - (Part 3) |
71. Reactive dye absorp up to _?
Ans: Up to 90%
72. If the molecular weight of reactive group increases then
what happened?
Ans: Reactivity increases.
73. Reactivity of vinyl sulhone group and halogen group
increases with which parameters?
Ans: PH and time.
কাটিং / Cutting কোয়ালিটি সুপারভাইজার এর কাজ কি
ফিনিশিং বিভাগ এর সকল নিয়ম কানুন । কি কি মেনে চলতে হবে
ফিনিশিং কোয়ালিটি সুপারভাইজার এর কাজ দায়িত্ব ও কর্তব্য
74. What is the chemical structure of cellulose molecule?
Ans:
Chemical structure of cellulose molecule
75. What is the reaction ratio between -CH2OH and –CHOH
(In case of monochloro triazinyl)?
Ans: 15:1
76. What is the reaction ratio between -CH2OH and –CHOH
(In case of Dichloro triazinyl)?
Ans: 3:1 to 7:1
77. How many types of Reactive dye on the basis of
Reactive group?
Ans: 2 types (1. Halogenated heterocycles, 2. Acivated vinyl
compounds.).
78. Which groups are in halogenated heterocycles?
Ans: 1. Triazine group (Procion, Cibacron, Pyrimidine etc), 2.
Quinoxaline (Levafix, Dichloro quinuxaline).
79. Give some examples of activated vinyl groups?
Ans: Vinyl sulphone (Remazol), vinyl sulphonamide
(Levafix), vinyl acrylamide
(Primazine).
80. How many types of reactive dye on the basis of
reactivity?
Ans: 1. High reactivity (Procion M), 2. Moderate reactivity
(Liva fix E), 3. Low reactivity (Premazine).
81. Reactive dye can be divided into _ group?
Ans: Hot brand and cold brand.
82. How many types of reactive dye on the basis
chemically?
Ans: 1. Chloro triazinyl, 2. Vinyl sulphone, 3. Heterocycle
halogen.
83. Fastness of Procion Scarlet MX-G?
Ans: Light: 4, washing: 4, hydro chlorite bleaching: 2.
84. What is hydrolysis of reactive dye?
Ans: The reaction of dye with water.
85. What are the stages of reactive dye?
Ans: 1.Exhaustion of dye, 2. Fixation, 3. Wash off.
86. Why an electrolyte is necessary when fibre is immersed
in dye liquor?
Ans: To assist the exhaustion of dye.
87. What is used as electrolyte in reactive dye?
Ans: NaCl.
88. What is fixation?
Ans: The reaction of reactive group of dye with terminal –
OH & -NH2 group of fibre and thus forming strong covalent
bond.
89. How fixation controlled?
Ans: By maintaining proper PH by adding alkali.
90. Why wash off applied & why it is necessary?
Ans: To remove extra and unfixed dyes from material
surface and is necessary for level dyeing and good wash
fastness.
91. What are the controlling parameters of reactive dye?
Ans: PH, temperature, dyeing time, liquor ratio,
concentration of electrolyte.
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92. What is the recipe for cold band reactive dye?
Ans: Dye→3%, salt→60gm/l, soda ash→15gm/l, M:L→1:10,
temp→60º C, time→1hr.
93. What is the recipe for hot band reactive dye?
Ans: Dye→4%, salt→80gm/l, soda ash→20gm/l, M:L→1:15,
temp→50-90º C, time→1-0.5hr
94. What are the dyeing methods?
Ans: 1. Discontinuous method {Jigger dyeing machine
(woven), Winch dyeing machine (knitted), Jet dyeing
machine (woven + knitted)}, 2. Semi continuous method
(Pad jig method, Pad steam method), 3. Continuous method
(Pad dry method, Pad steam method).
95. Why disperse dye is so called?
Ans: Because it is non soluble, non ionic dye and
molecularly dispersed, further dispersing agents are used
with the dye.
96. Fastness of disperse dye is?
Ans: Light fastness rating 4-5 and washing fastness is 3-4.
97. Why sublimation power of disperse dye is good?
Ans: Stable electron management.
98. Name some disperse dye.
Ans : Terasil, Foron, Palanil, Resonil, Samaron, Dispersal.
99. Why disperse dye is added to water with surface active
agent?
Ans: To form an aqueous dispersion.
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