The development of the sleeping bag
Early humans all used animal fur to make warm clothing and sleep MATS, including the Eskimos living near the North Pole, and people still use it. Explorers and mountaineers began testing different sleeping bag systems in the early 19th century. Early sleeping bags were filled with camel hair with excellent thermal insulation. Later, hollow rubber air cushions were invented and used for expeditions to the poles of the Earth in the 1720s. The first Alps sleeping bag prototype was tested by Francis Fox Tuckett in 1861, and the envelope design was perfected in the mid-1760s, with a hollow rubber coating near the ground as thermal insulation.
Down was widely used to fill mattresses at the beginning of the 19th century because of its good thermal insulation properties. In the Victorian era of Britain, women even filled the inner layer of skirts with down to keep warm, but the treatment and use of down technology began to develop in the mid-19th century. An earlier documented down sleeping bag was used by ALFRED MUMMERY's expedition in England in 1892, developed from a sleeping bag prototype by the Alpine Mountaineering Club, and manufactured by a British furniture company, but this was not the production of a true commercial sleeping bag. In 1890, the Norwegian company ajungilak began commercial production of sleeping bags, which during this period were filled with kapok. Until the 19th century, sleeping bags were specialty products, but due to the growing demand for outdoor goods market, more companies began to design and produce sleeping bags. Based on the rise of Himalayan exploration activities and mountaineering, the design and production of sleeping bags began to develop and improve in the 19th century, when the birth of the mummy sleeping bag that can tightly wrap the body, British mountaineers also successfully climbed Mount Everest with this sleeping bag. After the industrial revolution due to the development of manufacturing and chemical industry, synthetic fibers began to be mass produced, because of the excellent thermal properties of synthetic fibers also began to be widely used in the production of sleeping bags.
In the 19th century, hiking and camping became popular in Europe, and the demand for outdoor equipment began to rise. The sleeping bag has become a commercial product, and the production business began to mark the sleeping bag to facilitate customers to choose according to their own needs when purchasing, the temperature scale of the first mark is very simple, only summer, three seasons and winter use three kinds of distinction, such a distinction is rough, can only be choosed according to the approximate use temperature. Later, some brands of sleeping bags began to give two temperature scales: comfort temperature and limit temperature.
Over the years, sleeping bag temperature scales have evolved into a number of different standards, each with supporters and opponents, and the test methods for these standards have been developed by scientists in the UK, France, Germany, Norway, the United States and Switzerland. Although each brand of sleeping bag has a recommended comfort temperature based on its own testing, this standard is similar across most high-quality sleeping bag brands. Sellers and buyers of sleeping bags understand that the comfort temperature labeled on a sleeping bag is only based on the results of an ideal test, and the comfort temperature is often several degrees higher in actual use.
