In general, hollow products with a volume greater than 30L are called large blow moldings. As the high molecular weight and high density polyethylene (HMWHDPE) resin brings new development to the blow molding industry with its ultra-high impact strength and melt strength, it has made it possible to produce large-scale plastic packaging barrels that meet the international requirements for transportation of dangerous goods. . In recent years, developed countries have begun to use large hollow plastic packaging containers in chemical, transportation, automotive and other industries.
The main products that have been developed on the market include various heat-resistant, corrosion-resistant, and high-strength large size (200L) hollow containers (barrels). The quality meets the requirements of IMDG (International Maritime Dangerous Goods) and is internationally recognized. All kinds of pad board with flame retardant, light weight, sanitary safety, and high strength have realized the use of plastic substitute wood, which can save a lot of wood, and its life can be greatly improved. In 1984, China began trial production of 200L plastic vats. In 1993, it designed and manufactured the first domestically produced large-scale blow molding machine and put it into operation.