Degumming in Paper Manufacturing

Degumming is a process used in paper manufacturing to remove impurities such as gums, resins, and waxes from raw materials like wood pulp or recycled paper. The process helps to improve the quality of the paper and prevent the buildup of impurities in the papermaking equipment.

Methods of Degumming

There are several methods of degumming used in paper manufacturing, including:

1. Acid Degumming: In this method, the raw material is treated with an acid such as sulphuric acid or nitric acid to dissolve the impurities. However, this method can be harsh on the fibers and may lead to the degradation of the pulp.

2. Alkali Degumming: In this method, the raw material is treated with an alkaline solution such as caustic soda to break down the impurities. This method is gentler on the fibers and is often used in the production of high-quality paper.

3. Enzymatic Degumming: This method uses enzymes to break down the impurities in the raw material. It is a more environmentally friendly method but can be slower and more expensive than other methods.

4. Bleaching Powder Degumming: In this method, the raw material is treated with bleaching powder (calcium hypochlorite) to remove the impurities. This method is often used in the production of recycled paper.

Answer

The correct answer for the question is option B, i.e., Bleaching Powder. Bleaching powder is used in the degumming process to remove impurities from the raw material in the production of recycled paper. It is a cost-effective method that helps to improve the quality of the paper while also preventing the buildup of impurities in the papermaking equipment.