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Practice Exam 3_TOP-1

Practice Exam 3_TOP-1 - 1 Which one(s dye cotton 2 Which...

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PCC 301 Name __________________________ Dyeing & Finishing Technology Practice Exam III I. Terms and Definitions Define each of the following terms using words or an example. 1. Squeegee - 2. Reduction-clear - 3. Retarder - 4. Cold pad batch - II. Short discussion 1. If you need to dye Polyester with the aid of a carrier, how would you decide which carrier to use?
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2 2. Discuss the process involved in the application of the following dye. Include in your answer: a) the fiber type, b) the dyebath auxiliaries required, c) the structure of the dyed fiber, and d) the pH required. 3. Explain why the following 2 dyes were invented.
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3 III. Dye classification Consider the following 5 dye structures when answering the questions below.
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Unformatted text preview: 1. Which one(s) dye cotton? 2. Which one(s) dye wool? 3. Which one(s) dye acetate? 4. Which one(s) require alkali in the dye application step? 5. Which one(s) have good lightfastness? 4 IV. Calculations 1. A 50:50 blend of polyester/cotton fabric (40 kg) is to be dyed with 0.5% (owf) disperse dye, using a 20:1 liquor ratio. What volume of a 10g/L stock solution of disperse dye is needed? 2. A total volume of 20ml of 1% acetic acid was used in producing a 1% (owg) shade of Acid Orange 7 on 20g of wool yarn. What was the concentration of acetic acid in the dyebath, if the liquor ratio was 30:1?...
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