Which of the following is main process in paper industry:
Correct answer: C. Digestion
- A. Screening
- B. Bleaching
- C. Digestion
- D. Stock preparation
Explanation
Digestion is the main process in the paper industry where wood chips or other raw materials are cooked in a chemical solution, typically consisting of sodium hydroxide and sodium sulfide (in the Kraft process), to break down the lignin and separate fibers for papermaking.
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Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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