In Blow Mould, material is melted then formed to create a hollow part. There are various types of blow molding: extrusion blow molding; injection blow molding; and stretch blow molding. Blow molded products can be broadly classified into packaging (such as soda bottles) or industrial (like fuel tanks).
Injection blow moulding is used in the production of large quantities of hollow plastic objects. The process starts with the injection moulding of a polymer onto a core pin which is then rotated to a blow moulding station to be inflated and cooled. Typically used to make small medical and single serving bottles, injection blow moulding is the least-used of all blow moulding processes.
The preform mould opens and the core rod is rotated and clamped into the hollow, chilled blow mould. The core rod opens and allows compressed air into the preform, which inflates it to the finished article shape.
After a cooling period the blow mould www.pet-mould.com opens and the core rod is rotated to the ejection position. The finished article is stripped off the core rod and leak-tested prior to packing. The preform and blow mould can have many cavities, typically three to sixteen depending on the article size and the required output. There are three sets of core rods, which allow concurrent preform injection, blow moulding and ejection.