Pulp and Paper | Solution of questions set | Grade 12 | Chemistry
01. a. Differentiate between paper and pulp.
b. What is the main source of pulp?
c. What are the uses of papers?
a. The main component required to create paper is pulp. A sheet used for writing or
printing is called paper. While pulp is a soft, watery, and formless substance, paper is
typically created from cellulose fibers from wood chips, which are dry or waterproof
containers.
b. Wood fibre is the main source of pulp which is made from breaking down the fibrous part of plants.
c. Paper has many uses including printing, packaging, decorating, writing, cleaning, filter paper, wallpaper, book endpaper, conservation paper, laminated worktops, toilet tissue. currency and security paper and a number of industrial and construction processes
2. a. Why do pulp milis smeli so bad?
b. What does pulp and paper mean?
c. What are the qualities of paper?
a. During the manufacture of paper in paper mills, gases like ammonia, sulphur dioxide,
hydrogen sulphide etc are emitted. Due to these gases, smell of paper and pulp mill has bad
b. Pulp: it is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibers from wood, fiber crops, waste paper.
Paper: Paper means a thin material made of fiber pulp.
c. Following are the factors that determines the quality of paper
i. Weight
ii. Colour
iii. Surface
iv. Dimension of sheet
3. a. Draw the flow sheet diagram for the manufacture of paper.
b. How can you check the quality of paper?
a. The flow sheet diagram for manufacture of paper is given as:
b. Quality of paper is checked by
- Tearing: Good quality of papers are teared in straight direction.
- Writing: Smooth writing determines the quality of paper
- Drawing line: Clearly drawing also determines the quality of paper.
4. a. Describe the steps for the manufacture of paper in the paper industry.
b. What are the main challenges for establishing paper factory in Nepal?
c. What are the markets of paper in Nepal?
a. Following are the steps for manufacturing paper in the industry
- Pulping process will be done to separate and clean the fibers
- Refining process will be followed after pulping processes.
- Dilution process to form a thin fiber mixture.
- Formation of fibers on a thin screened.
- Pressurization to enhance the materials density.
b. There are many challenges for establishing paper factory in Nepal, some of them are given as:
- Nepal has been known as one of the poorest countries in the world. Low income, illiteracy, dependency on agriculture, lack of proper knowledge, lack of employment opportunities can be listed as the main causes of poverty.
- The trade imbalance of Nepal has been a major issue in the economic development of the nation.
- One of the main reasons why Nepal is behind in terms of development is the political condition of the nation.
c. There are big market of paper in Nepal. Most of paper are exported from other countries like India, China, Bangladesh etc. Mainly, paper is used in making newspapers, books, cards, cartons, bags etc.