1. The initial stage (before 1980): The product structure is simple and the function is single. The embedded stoves Before the 1980s, the development of China's gas industry was still relatively backward. The popularity of urban gas was very low, only 100%. A dozen or so, almost no people in the vast rural areas use gas. At that time, the gas stove was in its infancy (before 1980), and its product structure was simple and its function was single. Previously, each of the gas appliances had the simplest gas stove, and the product structure was simple. Most of the cooktop materials are cast iron, surface plating or spraying, and there is no electric ignition device, and the process is also in a relatively primitive state. 2. Development stage (1980-1990): greatly improved durability and reliability After 1980, with the deepening of reform and opening up, the market economy has risen. Various foreign gas appliances have entered China, and the number of gas appliance manufacturers has soared from nearly 10 to nearly 100. It has also evolved from a single gas company to a state-owned, collective, private and other business types. Foreign famous gas appliance manufacturers have also begun to find partners in China, thus making the quality and appearance of gas appliances. There have also been fundamental changes, and the variety and function of the products are constantly changing. During this time, panels, combustion systems, and ignitions have also been improved. The panel material is cold plate sprayed, the burner has a cast iron burner, surface plating or zinc spray treatment, and the ignition device adopts piezoelectric electronic ignition to improve the ignition rate, and the durability and reliability of the gas stove are improved. 3. Breakthrough stage (1990-2006): The variety is increased and the styles are complete. After the 1990s, China and the world economy entered a stage of rapid development. China's gas and gas appliance business has entered a period of rapid growth. The introduction of foreign advanced burning appliance development and manufacturing technology has brought about a breakthrough change in China's burning appliance business. Household gas cookers have increased varieties, novel styles, enhanced safety measures, and improved materials, functions and performance. Improvements in production quality and reliability, process level, automation and intelligence, advancement of performance indicators, energy conservation and environmental protection, and safe use have also been made. The material of the cooker basically eliminated the cast iron. Stainless steel panels, surface-coated non-stick oil coating materials, tempered glass panels, etc. occupy an important position in the cooker, and ceramic panels in recent years are also unique. Residential Sectional Garage Door
A typical version of an overhead garage door used in the past would have been built as a one-piece panel.The panel was mounted on each side with unequal parallelogram style hinge lifting mechanism. Newer versions of overhead garage doors are now generally built from several panels hinged together that roll along a system of tracks guided by rollers. The door is balanced by either a torsion spring system or a pair of extension springs.A remote controlled motorized mechanism for opening garage doors adds convenience, safety, and security
• Aluminum garage doors are low-cost, light, rust-proof, and feature low-maintenance. They are prone to denting because aluminum is not strong and they are energy-inefficient since aluminum is a highly conductivematerial.
• Fiberglass and vinyl garage doors are composite units, combining a steel core behind a fiberglass or vinyl skin. They have also polyurethane insulated base sections, or other type of foam insulation. These premium doors can match steel garage doors, and be a realistic imitation of wood (namely fiberglass units), but they may be more expensive than steel units.
• Steel doors have become common and are available in a variety of sizes and styles, provide strength and security, are cost-competitive, and may have optional insulating value. Extra strength is available with two or three layers of galvanized steel with a low gauge number (23-24 gauge steel panels).
• Wood garage doors offer aesthetic appeal, but they are high-maintenance and may be expensive. Low-priced wood garage doors may warp and break easily.
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