The production method and tool of blow molding processing
Extrusion blow molding is a method of making hollow thermoplastic parts. Well-known blow molding targets for hollow blow molding are bottles, buckets, cans, boxes, and all containers that package food, beverages, cosmetics, medicines, and daily necessities. Large blow molding containers are commonly used for the packaging of chemical products, lubricants and bulk materials. Other blow molded items include balls, blow molded wheels, bellows and toys. eva Foam products For car manufacturing operations, fuel tanks, car shock absorbers, seat backs, center brackets and armrests and headrest cover are blown. For machinery and furniture manufacturing, blow moulded parts are shells, door frames, frames, POTS or boxes with an open side.
The common blow-extruded plastic material is high-density polyethylene, the polymer used in most milk bottles. Other polyolefins are also often processed by blow molding. Depending on the use, styrene polymers, polyvinyl chloride, polyester, polyurethane, polycarbonate and other thermoplastics can also be used for blow molding.
Recently, engineering plastics have been widely accepted in the car industry. Data selection is based on mechanical strength, weather resistance, electrical function, optical function and other functions. Three quarters of blow molding products are made by extrusion blow molding. Extrusion is the process of forcing material through a hole or mold to make a product.
Extrusion blow molding process consists of 5 steps:
1. Plastic embryo (extrusion of hollow plastic tube);
2. Close the flap mold on the mold, clamp the mold and block the mold;
3. Blow to the cold wall of the mold cavity, adjust the opening and maintain a certain pressure during cooling;
4. Open the mold and remove the blown parts;
5. Trim the flash to get the product.
