Blow molding is a method of manufacturing a hollow plastic part by inflating a heated plastic tube until it fills the mold and forms a desired shape. The feedstock in this process is a thermoplastic in the form of small particles or particles which first melts and forms a hollow tube called a parison.
Blow molded parts can be formed from a variety of thermoplastic materials as belows:
Low Density Polyethylene (LDPE)
High Density Polyethylene (HDPE)
Polyethylene Terephtalate (PET)
Polyvinyl Chloride (PVC)
Extrusion Blow Molding, The extruder uses a rotating screw to force the molten plastic through the die forming the parison of the blow needle. The parison is vertically squeezed between the two open mold halves so that they can be closed on the parison and the blower. The pressurized air flows through the blown tube to expand the parison. This is the most common type of blow molding used to make a large number of relatively simple parts.
Injection Molding - The molten plastic is injected into the core around the blank to form a hollow parison. When the parison mold is opened, the parison and the core are transferred to the blow mold and firmly clamped. The core then opens and allows the pressurized air to inflate the parison. This is the least common method because the productivity is low, but more complex parts can be formed with higher accuracy. Injection blow molding is generally preferred for small complex bottles, such as bottles for medical use.
Stretch blow molding - parison is formed in the same way as injection blow molding. However, once transferred to the blow mold, it is heated and pulled down by the core before being inflated. This stretch has a greater strength for the plastic. Stretch blow molding is often used to produce parts that must be subjected to some internal pressure or very durable, such as a vial.
Minimum Order Quantity: 1000 pieces.
Lead time: 25-40 working days.
1. High production rates,
2. Repeatable high tolerances,
3. Use a wide range of materials,
4. Low labor cost,
5. Minimal scrap losses,
6. Little need to finish parts after molding.
Payment terms: T/T, 50% deposit when placing order.
50% balance before shipment.
Shipment: FedEx / DHL/ UPS/ TNT Express is acceptable.
Or shipped by freight forwarder. (Cost-effective)