Process history of blow molding machine
Enoch Ferngren and William Kopitke first verified the blow molding process. The principle of this process is derived from glass blowing. In 1938, Ferngren and Kopitke built a blow molding machine and sold it to the Hartford Empire Company. This is the beginning of the commercial blow molding process. In the 1840s, the variety and quantity of plastic products were very limited. Therefore, the blow molding process did not develop rapidly until very late. With the increase of product types and productivity, soon more and more plastic products are made by blow molding process. In the US soft drink industry, the number of plastic containers has grown from zero in 1977 to 10 billion in 1999. The blow molding process was used to produce low-density polyethylene vials during the Second World War. 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 the hollow container can reach thousands of liters, and some production has adopted computer control.
Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The resulting hollow containers are widely used as industrial packaging containers. According to the production method of the parison, blow molding can be divided into extrusion blow molding and injection blow molding, and the newly developed multi-layer blow molding and stretch blow molding. The extrusion process is to extrude the plasticized plastic into the extrusion blow die head through a screw, and then cooperate with the mold below and compressed gas to realize the product molding.
The extrusion blow molding process consists of 5 steps: 1. The plasticized raw materials are made into plastic preforms; 2. Part of the preforms are intercepted by closing the mold and cut off the pet preform mold; 3. The cavity is filled with gas to form The embryo is formed and cooled; 4. Open the mold and take out the formed container; 5. Trim the flash to obtain the finished product. 1. Preheating: Irradiate the preform (embryo) through the infrared high-temperature lamp to heat and soften the body of the preform (embryo). In order to maintain the shape of the bottle mouth, the mouth of the preform (embryo) does not need to be heated. , So it needs a certain cooling device to cool it down. 2. Blowing molding. At this stage, the preheated preform (embryo) is placed in the ready-made pet preform mold design, and the interior is inflated with high pressure to blow the preform (embryo) into the required bottle. Bottle blowing machines on the market are generally divided into automatic and semi-automatic. The automatic bottle blowing machine combines the two operations of bottle blowing through the operation of the manipulator, eliminating the need for the manual process of putting the preheated preform (embryo) into the blowing mold. Greatly speed up the production rate, of course, the price is also higher than the semi-automatic.
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