At the same time, the classification of paper is also varied. According to the use, it can be divided into printing paper, wrapping paper, industrial paper, office paper, household paper and special paper.
White newspaper is characterized by softness, porosity, certain mechanical strength and good absorbability, which can make the ink permeate and fix in a short time and won't get dirty when folded. It is used to print newspapers, periodicals and general books on high-speed rotating machines.
Hemp cardboard is a kind of cardboard used for strong cartons, which is widely used for shipping books, department stores, radios, televisions, machine parts, food and so on.
Coated paper is an advanced printing paper which is made by coating a layer of white paint made of calcium carbonate or white clay and adhesive on the base paper, drying and calendering.
Letterpress paper is a kind of paper suitable for letterpress printing of books, stationery and magazines.
Dowling paper is used in books and periodicals by offset presses. Suitable for printing monochrome or multicolor book covers, characters, inserts, pictorial, maps, posters, color trademarks and various packaging products.
Extended data:
The development of paper has also experienced a tortuous process. /kloc-after the invention of papermaking in 0/05, papermaking spread from Henan to other economically and culturally developed areas. Cai Lun sealed the Dragon Pavilion in Yangxian County, Shaanxi Province, and papermaking spread to Hanzhong area, and gradually spread to Sichuan. According to the folklore of Cai Lun's hometown Leiyang, Hunan, Cai Lun also taught papermaking to his hometown before his death.
At the end of the Eastern Han Dynasty, Shandong's papermaking was also relatively developed, and it was an expert in papermaking in Donglai County (now Yexian County) of Zuo Bo. After the popularization of papermaking in China in the second century, paper became a strong competitor of silk books and bamboo slips. In the third and fourth centuries, paper has basically replaced silk and bamboo slips as the only writing material in China, which has effectively promoted the spread and development of science and culture in China.
During the Wei, Jin, Southern and Northern Dynasties from the third to the sixth century, China's papermaking was constantly innovated. In terms of raw materials, in addition to the original hemp and paper, it is also expanded to use mulberry bark and rattan bark to make paper. In terms of equipment, the paper-making technology of the Western Han Dynasty was inherited, and more movable curtain bed paper molds appeared. A movable bamboo curtain is placed on the frame, which can repeatedly fish out thousands of wet papers and improve work efficiency.
In processing and manufacturing technology, alkali liquor cooking and beating were strengthened, and the quality of paper was improved, and processed paper such as colored paper, coated paper and filler paper appeared.
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