cloth desizing range tender Interview Questions and Answers

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Cloth Desizing Range Tender Interview Questions & Answers

  1. What is desizing?

    • Answer: Desizing is the process of removing sizing agents from fabrics before further processing like bleaching, dyeing, or printing. Sizing agents are applied to warp yarns before weaving to increase their strength and abrasion resistance.

  2. What are the common sizing agents used in textile industry?

    • Answer: Common sizing agents include starch (corn, wheat, potato), PVA (polyvinyl alcohol), CMC (carboxymethyl cellulose), and synthetic polymers.

  3. Explain different desizing methods.

    • Answer: Desizing methods include enzymatic desizing (using enzymes to break down starch), acid desizing (using acids like sulfuric acid to hydrolyze starch), oxidative desizing (using oxidizing agents), and scouring (using alkali to remove sizing and other impurities).

  4. What are the advantages and disadvantages of enzymatic desizing?

    • Answer: Advantages: Environmentally friendly, effective at low temperatures, less damage to fibers. Disadvantages: Enzyme activity can be affected by pH and temperature, can be expensive.

  5. What are the key parameters to consider when selecting a desizing range?

    • Answer: Key parameters include fabric type, sizing agent used, production capacity, desired desizing efficiency, environmental regulations, and budget.

  6. Describe the different types of desizing machines.

    • Answer: Common desizing machines include pad-batch systems, continuous desizing ranges (jet desizing, rope desizing), and open-width desizing ranges.

  7. What is the role of temperature and pH in enzymatic desizing?

    • Answer: Temperature and pH are crucial for optimal enzyme activity. Each enzyme has an optimal temperature and pH range for maximum efficiency. Outside this range, enzyme activity decreases significantly.

  8. How do you ensure complete desizing?

    • Answer: Complete desizing is ensured through proper selection of desizing agent and method, optimization of process parameters (temperature, time, concentration), and thorough monitoring and testing (e.g., iodine test for starch).

  9. What are the environmental concerns associated with desizing?

    • Answer: Environmental concerns include wastewater containing chemicals and enzymes, energy consumption, and disposal of spent chemicals.

  10. How can you minimize the environmental impact of desizing?

    • Answer: Minimize environmental impact through using environmentally friendly desizing agents (enzymes), optimizing process parameters to reduce chemical usage, implementing wastewater treatment, and adopting energy-efficient technologies.

  • What is your experience with troubleshooting desizing problems?

    • Answer: I have extensive experience troubleshooting desizing issues, including analyzing the root cause of incomplete desizing (e.g., insufficient enzyme concentration, incorrect pH, inadequate dwell time), addressing machine malfunctions, and optimizing process parameters to resolve the problem.

  • What safety precautions should be taken during desizing operations?

    • Answer: Safety precautions include wearing appropriate personal protective equipment (PPE) such as gloves, goggles, and lab coats, proper handling and storage of chemicals, ensuring adequate ventilation, and following established safety procedures.

  • How would you evaluate the performance of a desizing range?

    • Answer: I would evaluate the desizing range's performance by assessing desizing efficiency (residual sizing), production rate, chemical consumption, energy consumption, wastewater quality, and overall cost-effectiveness.

  • Describe your experience with different types of fabrics and their specific desizing requirements.

    • Answer: I've worked with a variety of fabrics, from cotton and linen to synthetics and blends, understanding that each requires tailored desizing parameters based on fiber type, yarn construction, and sizing agent used. I adjust the process accordingly to ensure optimal results without fiber damage.

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