In the STRETCH BLOW MOLDING process, the plastic is first molded into a "preform" using the injection molding process. These preforms are produced with the necks of the bottles, including threads on one end. These preforms are packaged, and fed later (after cooling) into a reheat stretch blow molding machine. In the SBM process, the preforms are heated above their glass transition temperature, then blown using high pressure air into bottles using metal blow molds. Usually the preform is stretched with a core rod as part of the process. In the single-stage process both preform manufacture and bottle blowing are performed in the same machine. The stretching of some polymers, such as PET preforms manufacturers in india results in strain hardening of the resin, allowing the bottles to resist deforming under the pressures formed by carbonated beverages, which typically approach 60 psi.PET preforms manufacturers main applications are bottles, jars and other containers.Advantages of blow molding include: low tool and die cost; fast production rates; ability to mold complex part; produces recyclable parts.
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