Question

According to the Bureau of Indian Standards (IS: 1397, 1990), Kraft paper of Grade 2 quality is made from

• A. 100% waste or recycled paper
• B. 100% unbleached sulfate pulp
• C. A mixture of agricultural crop residues and sulfate pulp
• D. A mixture of agricultural crop residues and waste paper

Hint:

Under BIS standards: - Grade 1 Kraft paper $\rightarrow$ 100% pure sulfate pulp. - Grade 2 Kraft paper $\rightarrow$ Blends of agricultural residues and sulfate pulp.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Kraft paper is a high-strength paper produced using the sulfate chemical pulping process.
The Bureau of Indian Standards (BIS) under IS: 1397 classifies Kraft paper into different grades based on the raw materials used and the resulting strength properties.

Step 2: Detailed Explanation:
According to BIS standards:
- Grade 1 Kraft paper must be manufactured from 100% virgin unbleached chemical sulfate (kraft) pulp to ensure maximum tensile strength and burst factor.
- Grade 2 Kraft paper is a utility grade designed to utilize alternative fiber sources.
It is manufactured from a mixture of agricultural crop residues (such as bagasse or straw) and virgin sulfate chemical pulp.
This blending allows for a cost-effective paper that still maintains the baseline strength and tearing resistance required for general packaging.
Therefore, according to IS: 1397, Grade 2 Kraft paper is made from a mixture of agricultural crop residues and sulfate pulp.

Step 3: Final Answer
The correct option is (C).