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What Is Blow Moulding?
Nov 04,2022
Blow Moulding is a manufacturing process that involves using air to blow heated materials. This process has its roots in Syrian glass workers, who used air to blow glass into a long tube. The blob of white-hot liquid glass was spun around, and the worker blew into a mouthpiece on the other end of the tube. The process was refined in Europe as demand for bottles increased. Egypt's blow moulding process dates back to 1700 BC, when it was first used in royal thumbs. Further developments were made during the 20th century, as the soft drink industry went from zero plastic containers to ten billion pieces in 1999.
The shape of a blow mould is determined by its cavity and the amount of material to be moulded. The size of the cavity will determine the final shape of the molded plastic. The process involves two distinct phases: the preform and the mould. The former process produces a preform that is softer than the latter, while the latter produces a solid product that does not break.
Blow moulds are typically two-piece structures, but may have more than one. Each half contains a cavity and a slot for remaining material. Blow moulds must have an adequate ventilation system after they close, as poor ventilation can lead to poor preform fit and shape defects. In addition, poor venting can result in markings and pits on the final product.
