Blow molding is a highly developed molding technology, it is best suited for basically hollow parts (such as plastic bottles) with uniform wall thicknesses, where the outside shape is a major consideration. The blow molding are widely used in bottles, containers, liquid soap, shampoo, motor oil tank, drums, tubs, and storage tanks.

Extrusion Blow Molding:
An extruder uses a rotating screw to force the molten plastic through a die head that forms the parison around a blow pin. The parison is extruded vertically between the two open mold halves, so they can close on the parison and blow pin. Pressurized air flows through the blow pin to inflate the parison. This is the most common type of blow molding and is used to manufacture large quantities of relatively simple parts.

Injection Blow Molding:
It is part molding. With injection blow molding, the hot plastic material is first injected into a cavity where it encircles the blow stem, which is used to create the neck and establish the gram weight. The injected material is then carried to the next station on the machine, where it is blown up into the finished container as in the extrusion blow molding process above. Injection molding is generally suitable for smaller containers and absolutely no handleware.

Stretch Blow Molding:
The parison is formed in the same way as injection molding. However, once transferred to the blow mold, it is heated and stretched downward by the core before being inflated. This stretching provides greater strength to the plastic. Stretch blow molding is typically used to create parts that must withstand some internal pressure or be very durable, such as soda bottles.

Materials:
1. Low Density Polyethylene (LDPE)
2. High Density Polyethylene (HDPE)
3. Polyethylene Terephthalate (PET)
4. Polypropylene (PP)
5. Polyvinyl Chloride (PVC)

Shanghai Sourcing can work with you to design, manufacture and produce your own, unique container shape, but we also carry a wide variety of stock molds which you can see in our stock mold product catalogue. The catalogue contains sprayers, powder containers, cylinders, ovals, squares, and more.