1. What are the raw materials of modern papermaking?
A: the raw materials of modern papermaking include plant fibers (wood, bamboo, grass, etc.), mineral fibers (asbestos, glass fiber, etc.), other fibers (nylon, metal wire, etc.), and polymer materials obtained by pyrolysis of petroleum. At present, the paper used for writing, printing, and packaging is mainly made of plant fiber.
2. What are the types of plant fiber raw materials for papermaking?
A: at present, plant fiber raw materials used in the paper industry can be divided into two categories
Wood fiber material: plant fiber obtained directly from trees.
Fiber materials are divided into wood fiber materials and non bast fiber materials.
3. What is the composition and function of the common auxiliary materials of paper?
A: Accessories refer to various additives added to the paper to meet the different performance of the paper. The auxiliary material is composed of filler, rubber, pigment and other chemical additives.
Fillers can improve the smoothness and opacity of the paper; binders can make the paper have water resistance; pigments can increase the whiteness of the paper; dyes can color the paper; other chemical additives can change the properties of the paper to provide some special uses of the paper.
4. What is the function of rubber?
A: the paper produced with plant fiber can absorb water or other liquids because there are a lot of pores between the fiber itself and the fiber, and the cellulose and hemicellulose that constitute the fiber contain a lot of hydrophilic hydroxyl groups. In order to prevent the paper from being infiltrated by water or other liquids, it is necessary to add anti liquid colloidal substances or film-forming substances into the paper to give the paper anti-liquid permeability and diffusion performance. In the paper industry, the process of sizing is called sizing.