What is blow molding and vacuum molding
Release time:
2024-05-28
1、 Blow molding:
Blow molding is a method of processing plastic products by using compressed air to cause hollow plastic billets in a high elastic or plastic state to undergo expansion deformation, and then cooling and shaping them. According to the type of blow molded products, this processing method can be divided into hollow blow molding and thin film blow molding.
1. Hollow blow molding:
When forming hollow blow molding, it is necessary to place the high elastic or plastic state of the hollow plastic blank in the closed blow molding mold cavity, and then introduce compressed air into it to force its surface area to expand (blow expand) and adhere to the surface wall of the mold cavity. Finally, after cooling and shaping, hollow plastic products with a certain shape and size can be obtained. Suitable for various bottle and cylindrical plastic containers.
2. Film blow molding:
Thin film blow molding is the process of using an extruder to shape molten plastic into thin-walled tube billets. Compressed air is blown from the center of the machine head into the tube billets, forcing them to undergo expansion deformation at high temperatures and transform into tubular thin films (bubble tubes). The bubble tubes move under traction and are compressed and overlapped between the rollers. Then, they pass through the traction roller and guide roller to reach the coiling roller, which is then rolled up into thin film products, suitable for various packaging bags.
2、 Vacuum forming:
Vacuum forming, also known as vacuum forming, belongs to the range of sheet metal forming. It is a processing method that uses a vacuum pump to extract clean air from the enclosed cavity formed by the plastic sheet and the mold surface, and then assists atmospheric pressure to cause plastic expansion deformation of the sheet (increasing surface area and reducing thickness), and then transforms it into plastic products by adhering to the mold surface. Vacuum forming is mainly used for packaging products, as well as some components in daily utensils, instrument casings, toys, and household appliances.
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