The history of blow molding
Also known as blow molding, a rapidly developing plastic processing method. The blow molding process began to be used to produce low density polyethylene vials during World War II. In the late 1950s, 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.
The hollow plastic products produced by the injection blowing process have the following advantages compared with the hollow plastic products produced by the extrusion process:
1 Plastic bottles are formed from raw materials to finished products at one time, with a high degree of automation, no need for manual secondary processing, labor saving, and hygienic, in line with the GMP requirements of pharmaceutical packaging, especially suitable for the production of medicine bottles.
2 The appearance of the product is beautiful, the size of the bottle mouth is accurate, and the weight of the plastic bottle is stable.
3 The plastic products are made by blow molding of injection molds at one time, and there is no waste at the bottle mouth and bottom of the bottle, and the bottle mouth is flat and has good sealing performance.
4 It is suitable for producing high-grade and exquisite plastic hollow products, such as cosmetic bottles, baby bottles, space cups, lamp balls, etc.
