In recent years, plastic products, one of the three major printing materials, especially expanded polystyrene, have become a red pollution of people's evil. The disposal of these polystyrene foam packaging has caused serious pollution to the environment. The earth's atmospheric ozone layer; the destruction of geological structures caused by the inability to corrode. These foam plastic wastes have caused great damage to the global environment. This article will introduce you to the printing material network.
Entering the Eastern Jin Dynasty, the printing materials for papermaking were changed to marijuana, and the paper made from marijuana was durable and beautiful. This paper is very close to rice paper. Xuan paper has been a very good quality printing material. Liang Wudi once recited poems, "White as frost and snow, Founder if you play chess, announce and remember, Ning Tong fish net." It is probably about Xuan paper printing materials. Since the Wei, Jin, Southern and Northern Dynasties popularized the three religions in this period, Emperor Wu of Liang said in his "The Three Poetry of the Three Poems" that he "study the Zhou Kong in a small time", "the Zhongfu Guandao Book", "the release of the later years, the moonlight "Star", and finally reached "to the point of no reason." It shows how important it is.
The improvement of paper, ink, pen and printing materials has become more and more simple, which has increased the spread of words and articles, thus promoting the development of cultural undertakings. The corresponding novels have also made corresponding progress at this time. . Although Liang Shuxiao's "Seven Records" is a private bibliography, it has a great influence on later generations.
From the detection indicators, the new standard requires testing according to the actual conditions of use, and the selection of food simulant, test time and temperature, etc., so that the test can scientifically and reasonably reflect the safety of the product in actual use. Sex, this requires companies to master the raw materials and conditions of use of their products.
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