Base paper is the starting material for manufacturing various types of paper and paper products. Its production process usually includes the following main steps:
1. Raw material selection:
- The raw paper preparation materials are usually cellulose sources, such as wood, bamboo, waste paper, linen, cotton, straw paper, etc. Different types of raw materials can produce different types of base paper, suitable for different applications.
- Raw materials are fed into pulping equipment to separate their cellulose. There are two main methods of pulping:
- Chemical pulping: In chemical pulping, the raw material is usually soaked in alkaline chemicals (such as sodium hydroxide and calcium hydroxide) to break down the wood fiber structure of the raw material, thereby separating out the cellulose.
- Mechanical pulping: In mechanical pulping, the raw material is separated from the cellulose by mechanical methods such as grinding, cutting and tearing without the use of chemicals. This method is suitable for cellulose sources such as waste paper.
- After pulping, cellulose usually undergoes a refining process to improve the quality of the cellulose and the dispersion of the fibers. This can be achieved with high-speed mixing or refining equipment.
4. Formation of base paper:
- After pulping and refining, the cellulose is fed to the base paper machine. In the base paper machine, the cellulose is suspended in water, and then the cellulose is formed into pulp through the process of screening and drainage, and the preliminary form of the base paper is formed on the mesh belt.
5. Drying of base paper:
- The formed base paper is conveyed to the drying section, where it is usually dried using large drying drums or drying belts. Hot air passes through the base paper, evaporating the water and making the base paper dry.
- After drying, the raw paper is rolled into rolls for future processing and sales. These rolls usually come in different widths and roll diameters to meet different customer needs.
7. Cutting and processing (optional):
- Raw paper can be cut into desired sizes and shapes to manufacture various types of paper and paper products. This may include further processing steps such as cutting, mounting, coating or printing.
8. Packaging and Shipping:
- Finally, the raw paper is packed and ready for shipment to a paper manufacturing plant or paper product manufacturing plant for further processing and manufacturing.
It is important to note that the base paper production process may vary depending on raw materials, equipment and paper type. Quality control and environmental measures are also very important factors in pulp and base paper production.