The establishment of “two-type†enterprises aims to speed up the transformation of development methods, with the goal of reducing resource consumption, reducing waste emissions, and increasing resource output efficiency. Through the establishment of pilot projects in key industries such as iron and steel, non-ferrous metals, chemicals, and building materials, setting a typical example , Sum up experience, guide the industrial sector and most companies to take the road of economic development, clean development, thereby accelerating the transformation of industrial development methods, promote industrial restructuring, and achieve the goal of establishing a resource-saving, environment-friendly society.
In the late 1900s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach thousands of liters, and some production has adopted computer control. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc., and the obtained hollow containers are widely used as industrial packaging containers. According to the method of making the parison, blow molding can be divided into extrusion blow molding and injection blow molding. The newly developed ones include multi-layer blow molding and stretch blow molding.
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