When Jin Yunhe used grass fiber as rayon abroad, she found that ramie containing a lot of gum is a very good fiber material, but the problem of how to completely remove the gum from ramie has been hovering in her mind. 1936 After returning to China, Jin Yunhe visited the main ramie producing areas in Hunan, Hubei, Sichuan and other countries during his tenure as Commissioner of the Central Economic Committee of Nanjing National Government, and made a detailed investigation on the planting, production, varieties and properties of ramie, and then began an experimental study on chemical degumming of ramie. During Chongqing 1937, the degumming experiment of Jinyun River was carried out with coarse chemical equipment. After 8 years of hard research, the method of uniform degumming of ramie raw materials was finally found. Jin Yunhe summarized it as a new chemical degumming process of "acid first, then alkali, two boiling, one bleaching or two bleaching". After chemical degumming, ramie fiber is white, clean, loose and shiny, and its shape is like clear sky and white clouds, so Jinyun Crane named it "Yunsi".
Jin Yunhe wrote in Yun Chuan (a report in 1939): "The year after I returned to China, War of Resistance against Japanese Aggression broke out, and all agricultural products were hard to export, especially Hankou. There was no way out, and farmers complained. I am suitable to go to Hong Kong to cross the Han Dynasty at this time, and I am deeply impressed by this phenomenon. I think the demand for cotton textiles will definitely increase greatly during my stay in War of Resistance against Japanese Aggression. It is a big problem for the Anti-Japanese War if we can replace cotton with surplus hemp, enrich textile raw materials and help the countryside effectively at the same time. With this emotion and purpose, I am determined to engage in fiber production. " 1939, Jin Yunhe used her new chemical degumming process to process ramie in Chongqing Southwest Chemical Plant (hereinafter referred to as Southwest Chemical Plant) and made "Yunsi" brand ramie fiber. The appearance of "Yunsi" caused a great shock. At that time, it was approved by the Ministry of Economic Affairs of Chongqing National Government for five years. Southwest Chemical Plant once purchased a set of Indian small spinning machines with a capital of 6,543,800 yuan at that time to make cotton substitutes, such as silk scarves, silk fabrics, silk wadding, cushions and mattresses. , especially yunsi cotton wadding and wadding. During their stay in War of Resistance against Japanese Aggression, Jinyun River and Southwest Chemical Plant made certain contributions to solving the problems of people's food, clothing, housing and transportation. 1942 1 At the exhibition held by Qianchuan Factory, Yunsi fiber and its products were highly appreciated. Lin Sen, then chairman of Chongqing National Government, dubbed Yunsi Cotton Tire "Spring in the Snow". Mr. Huang Yanpei also has an inscription, praising "the clouds are rolling and the clouds are comfortable, the things are moist and silent, and the cold people meet them, and the snow meets the spring." Soon, the news spread abroad, and an American capitalist heard about it and wanted to get a patent for "chemical degumming". Jin Yunhe's attitude is the same as before, leaving "patents" to his own country.
The birth of ramie chemical degumming technology developed by Jin Yunhe ended the ancient manual retting system. Compared with manual degumming, chemical degumming has short time and high efficiency, which can not only ensure the quality of degummed ramie fiber, but also meet the needs of industrial production.