Extrusion blow molding is a method of making hollow thermoplastic parts. Well-known blow molding objects are bottles, barrels, cans, boxes and all containers for packaging food, beverages, cosmetics, pharmaceuticals and daily necessities. Large blow-molded containers are commonly used for packaging of chemicals, lubricants and bulk materials.

Other blow molded products include balls, bellows and toys. For the automotive industry, fuel tanks, car shock absorbers, child car seats, center brackets, as well as armrest and headrest covers are blow molded. For machinery and furniture manufacturing, blow-molded parts are shells, door frames, racks, pots or boxes with an open face.

The more common raw material for blow molding and extrusion is high-density polyethylene (PE), and most milk is usually made of this polymer. Other polyolefins are also often processed by blow molding. Depending on the application, styrene polymers PS, polyvinyl chloride PVC, polyester, polyurethane, polycarbonate and other thermoplastics can also be used for blow molding. Engineering plastics have recently become widely accepted in the automotive industry. Material selection is based on mechanical strength, weather resistance, electrical properties, optical properties and other properties.

In the process of blow molding products, the control of the wall thickness of the parison is very important to improve product quality and reduce production costs. Therefore, early machines have used two-stage oil pressure to control the two positions of the mandrel shaft gap. , that is, there are only two effects of thick or thin. In order to meet the requirements of higher and higher precision and stability for blow-molded products, the modern embryo wall thickness control system has been equipped and used the servo hydraulic system and computer to form multi-stage control, thus greatly improving the product quality. quality. Kunshan blow molding processing

The product is accurately controlled during the blow molding process, so that the thickness of the embryo wall of the finished product can be consistent. Through the impact resistance experiment, it is found that the product with the same wall thickness not only uses less material, but also has a higher impact resistance strength. Therefore, adding a wall thickness control system to the blow molding machine can achieve higher productivity. Reduce material costs, increase output, shorten the cooling time of finished products, and improve overall production profits. Shanghai Blow Molding Processing

If the product is not controlled during the blow molding process, the thickness of the embryo wall after cooling will appear uneven, and these thinner positions are more likely to break during the impact resistance test. The reason is that during the cooling process, the different thickness of the embryo wall produces different stress, which reduces the quality of the product. If the gap of the mandrel can be changed with the position of the different parisons, so that it can produce products with a more uniform wall thickness, then the problem of easy rupture due to the different thickness of the embryo wall will be solved.

Kunshan Fulong Plastic Hardware Co., Ltd. has a large number of various blow molding products all year round. Welcome new and old customers to come to consult and purchase.