Detailed source of stockings:
The development of silk stockings is a history of concentrating technology and human needs. Handwork to knitting-the first leap of stockings. The earliest socks were born in the fifteenth century, when socks were produced by hand. At the end of the sixteenth century. At that time, a priest in England invented a mechanical knitting machine, which completely changed the history of handmade socks. The birth of mechanical knitting machine has attracted great attention from the British royal family. Anyone who dares to take the knitting machine out of Britain without permission is sentenced to death. However, the harsh punishment did not stop the British colonists from secretly transporting knitting machines to the New World of America.
The history of silk stockings can be traced back to the early 20th century. Due to the popularity of ready-made clothes, the concept of fashion has been widely accepted by the public. Fashion is no longer the privilege of the upper class, and women from all walks of life have joined the pursuit of fashion. The style of women's wear has undergone a breakthrough change, full of the flavor of the times. Women have also changed their feminine appearance in the past, generously revealing strong calves. Therefore, stockings have become their indispensable accessories. But the fibers used to produce socks at that time were all taken from nature, such as cotton, wool and silk. These materials must be carefully cut and sewn before application, and because of lack of elasticity, the manufacturing consumption is extremely high, and the woven socks are also easy to collapse.
The development of nylon stockings is undoubtedly a milestone in the history of socks, but while women enjoy the revolution of socks brought by nylon, they find that the biggest defect of nylon stockings is its lack of flexibility. So yarn manufacturers began to try to find a solution. 1959, after nylon fiber, DuPont once again contributed a man-made fiber product with excellent elasticity to the world-Lycra. From 65438 to 0970, Lycra was officially used in the production of stockings and pantyhose.
In the late 1960s and early 1970s, the birth of miniskirts set off a clothing revolution. Without exception, all the girls wandering the streets are wearing short skirts that only reach the upper thighs. At this time, stockings once again show its important position. At the same time, the appearance of miniskirts also gave birth to another important invention-pantyhose. The combination of the original stockings and underwear avoids the danger of wearing short skirts. Once pantyhose was born, it quickly occupied 70% of the market share of stockings. Until now, pantyhose is definitely the main force in the stockings market.
Women's dresses in the 1980s showed extreme sexiness, luxury and charm, especially women's evening dresses with low breasts and high slits. Therefore, stockings have become an indispensable part of evening accessories. The girl in the photo, hands in the air, has a black evening dress fluttering in the wind, revealing elegant black stockings. In addition, due to the application of high-tech elastic fiber, the knitting technology of stockings has been improved, and complex jacquard and fine lace, vivid stripes and fishing net patterns, and even metal wires and dazzling fake diamonds can become the fashion themes of stockings; Pink, light yellow, dark green, a variety of colors are also dazzling.
Women have always loved open-toed sandals. It is an unwritten rule to wear sandals without stockings, so many women are willing to completely liberate their legs trapped all the year round and show off colorful nail polish on their toenails. But at the same time, many white-collar women have to admit that wearing stockings in a serious office environment is not only the need of etiquette, but also can improve the appearance of legs to some extent. Thus, toe-less stockings came into being. The biggest difference between it and traditional stockings is the open design at the top of the stockings, which allows women's toes to be exposed naturally. When wearing this kind of toe-less stockings, the socks will not slide and shift at will, nor will they pile up on their feet. The safety anti-slip ring and ring opening at the top of the stockings are surrounded by Lycra fiber, which not only ensures the comfort to the feet, but also allows the toes to move freely.
Dupont company introduction:
DuPont was founded in 1802, with operations in 70 countries and more than 79,000 employees.
Two hundred years ago, DuPont was mainly a company that produced gunpowder. One hundred years ago, our business focus shifted to global chemicals, materials and energy. Today, when DuPont entered the third century, DuPont provided a solution based on science, which can really improve people's lives. Just take a closer look at everything around your home, and you will find DuPont's mark.
Over the past two centuries, our ability to adapt to change and our unremitting exploration of science have made us one of the most innovative companies in the world. However, in the face of constant change, innovation and discovery, our core values remain unchanged, namely, commitment to safety, health and environment, honesty and noble moral standards, and fair and respectful treatment of others.
Employees: 79,000 people, about half of whom work outside the United States.
Global distribution: Our company operates in 70 countries around the world and has 135 production and processing facilities.
Scientific research institutions: There are more than 40 R&D and customer service laboratories in the United States, and more than 35 laboratories in 1 1 countries.
Fortune 500 companies
Large American chemical companies. 1802 was founded by French immigrant e.i. DuPont near Wilmington, Delaware, USA, focusing on manufacturing gunpowder. Since the 20th century, products and investments have diversified, and the business scope covers many industries such as military industry, agriculture, chemical industry, petroleum and coal. There are more than 200 subsidiaries and operating organizations in the United States and nearly 50 countries and regions around the world, producing 65,438+0,700 categories and more than 20,000 varieties of petrochemicals, daily chemicals, medicines, coatings, pesticides and various polymers. The total turnover of 1983 reached $35.378 billion, ranking first among the annual sales of chemical companies in the world.
Dupont has always attached importance to research and development, and has many patents and major inventions. 1804, the first batch of black powder was made and put into the market. 1857 invented the soda explosive for blasting. 1880, nitroglycerin and Denham were produced, and nitrocellulose smokeless explosive was produced soon. 1904 nitrocellulose is used as coating and leather polish. Production of celluloid (nitrocellulose plastic) 19 15. After 19 17, it began to produce large-scale chemical products such as pigments and coatings. Neoprene rubber was founded in 193 1 year. The first synthetic fiber-polyamide fiber was invented in 1937, and polytetrafluoroethylene (see fluororesin) was developed in 1945. Since 1980s, research and development have focused on polymer materials related to energy conservation, materials used in electronic industry and information industry, and life sciences. 1983 scientific research expenditure is 966 million us dollars.