One area where hollow blow molding products are growing rapidly is industrial components, especially automotive components. Such as automobile fuel tanks, bellows, collars, windshield washer tanks, dashboards, air ducts of various shapes, and various complex hollow parts around generators. The combination of co-extrusion and three-dimensional (3D) blow molding is the main way to make such products. 1. Automotive Fuel Tanks Since the production of automotive plastic fuel tanks in 1973, automotive plastic fuel tanks are currently the largest production of blow-molded automotive parts. By 2000, plastic fuel tanks have accounted for 90% of the market share. The rapid development is because the hollow blown fuel tank can have complex geometries to make full use of the installation space, which is well adapted to the space requirements of automotive design, and is lighter in weight, low in manufacturing cost, high in economic efficiency, non-corrosive, and resistant to Strong deformation ability. Until the end of the 20th century, the fuel tank was mainly hollow blown from high-molecular-weight polyethylene single-layer extrusion. However, with the increase in environmental protection requirements, the use of multilayer barrier hollow blow-molded fuel tanks with higher barrier properties has become the development of automotive fuel tanks. trend. Due to the continuous change of automotive design and the requirements for the shape of the fuel tank, the design and production of automotive fuel tanks is a constant challenge for hollow blow molding processes and even plastic processing manufacturers. Kind of promotion. 2. Other Plastic Injection Molded Automotive Parts: using improved materials and processing technology, hollow blow molding technology can be used for a variety of new products. For example, door covers, instrument panels, seats, etc. for transmission oil filter, engine covers and large hollow blown automotive parts. In addition, many complex-shaped pipes on cars are increasingly produced using three-dimensional blow molding processes. The pipes that have been developed so far include 6 layers of co-extrusion blow-molded filler pipes, various air pipes and cooling medium pipes. Windshield washer tanks and ducts are also produced by blow molding.