Paper is a general term for a flexible fiber interwoven network or sheet formed by dehydration of an aqueous suspension of fibers (usually mainly plant fibers, sometimes including synthetic fibers, minerals and chemicals) on a fine filter. Paper is usually Divided into six categories by use: printing paper and cardboard; writing, drawing and reproduction paper and cardboard; packaging paper and cardboard; living and decorative paper and cardboard; technical paper and cardboard; processing Paper base.
Paper is mainly used for printing, writing, packaging and hygiene, but it is also used for a wide range of other purposes.
Carbon black is used in the paper industry as a black pigment to produce black, gray or dark colored paper or cardboard.
Compared with other organic pigments or dyes, carbon black is relatively cheap, and has good light resistance and chemical resistance. Moreover, it has good coloring and shading properties, and can also make paper conductive. Therefore, paper colored with carbon black is often used in decoration materials, light-proof packaging materials (such as packaging paper for photosensitive films), various album papers, high-voltage cable paper and recording paper, etc.
The amount of carbon black in the paper industry is second only to plastics and inks. As a colorant or conductive agent, it can be used to make packaging paper for photosensitive materials, template paper for construction, conductive recording paper, etc. It is mainly used as fruit bag paper black dye.
In recent years, the use of bagging protection in the whole process of fruit growth has become a development trend. The use of bagging for fruit cultivation can prevent the pollution of fruits by pesticides, reduce the impact of ultraviolet rays, wind and sand and insect damage on fruits, and can endow The appearance of the fruit is fresh and beautiful, and the inner meat is tender and crisp, with sufficient water, which not only greatly improves the appearance and inner quality of the fruit, but also increases the yield, improves the grade and survival rate of the fruit. The main factor affecting the appearance and color of fruits is the irradiation of ultraviolet rays on fruits. Fruit bag paper must have good shading performance and strong ability to absorb ultraviolet rays. Due to the high light absorption of carbon black, it has ultraviolet shielding effect, which makes the fruit bright in color; at the same time, carbon black has excellent light-shielding and chemical stability, and it will not fade after long-term exposure to sunlight, and the surface of the paper is fine and smooth. Therefore, carbon black is used for the coloring of various outer paper, inner paper, calendered paper and other fruit bag papers. When producing fruit bag paper, a certain amount of carbon black is added while beating.
The quality of carbon black for papermaking has the following requirements: ① low impurity content; ② high blackness, uniform color; ③ good dispersion; ④ strong tinting power; ⑤ good weather resistance; ⑥ strong hiding power.