Plastic steel doors and windows were developed in the late 1950s by West Germany and began production in 1959. The original plastic-steel doors and windows were all single-cavity structure, which was relatively simple and rough. With the worldwide energy crisis in 1972, the plastic steel doors and windows with better energy-saving effect in the early 1970s were used extensively, which also promoted the improvement of profile production technology. The performance has been improved day by day, from the original single-cavity profile to three-cavity and four-cavity profiles, which also led to the development of plastic steel doors and windows in Europe and Asia. According to incomplete statistics, the use of plastic steel doors and windows in Germany has accounted for 52% of the door and window market, Austria is 48%, Switzerland, Britain, France, Italy and other developed countries also have more than 10-20%; American steel doors and windows in the late seventies Starting from the beginning, the annual growth rate of usage is over 15%. At present, Japan, South Korea, Taiwan, Singapore, and Thailand use plastic steel doors and windows. China's plastic steel doors and windows started late, and the quality of calcium-plastic doors and windows produced in the 1970s was not enough. The production of real plastic doors and windows began with the introduction of equipment in 1983. At that time, the technology was not very advanced. They all used single-cavity or two-cavity structural profiles. With the improvement of the industry in 91 years, a number of extrusion equipment and molds emerged in China. Manufacturers of profiles, assembly equipment, etc.; In 1996, with the birth of the newly introduced manufacturers of advanced equipment in the 1990s, the company has greatly promoted the development of the industry. Now there are more than 2,000 extrusion lines in the country. More than 400, more than 3,000 assembly plants, 99-year profile production capacity of 800,000 tons, annual assembly of doors and windows capacity of 60 million square meters, has now become one of the few fast-growing industries in China. Plastic steel doors and windows are being accepted by users with their excellent performance. Sound insulation is also a major advantage of plastic steel doors and windows. The average sound insulation effect of single-layer glass for plastic steel doors and windows is 24db, and the double-layer glass sound insulation effect is 30db. Plastic steel doors and windows have good sound insulation.
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