What is the purpose of paper?

Paper can be used for cleaning, writing, packaging, decoration and as a carrier of printing, such as printing paper, carbon paper, toilet paper, facial paper and so on. Paper is a kind of thin sheet made of plant fiber, which can be folded at will for writing.

Paper is widely spread and used by people, and papermaking technology is further improved. Before the Jin Dynasty, papermaking was concentrated in Luoyang, Henan, and gradually spread to Vietnam, Shu, Shao, Yang, Anhui and Jiangxi, with increasing output and quality. Paper-making raw materials are also diversified, and there are many names of paper. Such as bamboo curtain paper, the paper has obvious lines, and its paper is tight, thin and even. Tunxi has rattan paper with rattan skin as raw material.

make paper

In order to prolong the life of paper, the Jin Dynasty invented a new paper dyeing technology, that is, the paper was impregnated with yellow tiller boiling juice, some of which were written first and then dyed, and some were dyed first and then written. Impregnated paper is called dyed yellow paper, which is natural yellow, so it is also called jute paper. Yellow paper has the function of killing insects and moth.

In the Jin Dynasty (4th century), paper finally replaced silk as the main writing material. Cai Lun has greatly promoted the production of hemp paper and leather paper. Although he is not the inventor of papermaking, his historical position as a technical innovator and organizer should be affirmed.

In the 8th century, paper was widely used in China. In the following centuries, China exported paper to all parts of Asia and kept the secret of papermaking strictly. In 75 1 year, there was a conflict between the Tang Dynasty and the Arab Empire, and the Arabs captured several China paper workers. Soon, the paper industry in Samarkand and Baghdad rose.

In this way, papermaking gradually spread all over the Arab world, where paper was widely used and then spread to North America and Europe through Arab countries.

According to historical records, more than 0/000 years after Cai Lun invented papermaking, the first paper mill was established in Europe. Although the modern paper industry has developed, its basic principle is still the same as that of Cai Lun. Seventy-eight of the ten raw materials for papermaking have been replaced by wood pulp, but the raw materials for making high-grade printing paper, cigarette paper, rice paper and typing wax paper are still nothing more than rags, bark, hemp heads and waste fishing nets used in Cai Lun.