Injection stretch blow moulding ISBM

Injection stretch blow moulding (ISBM) is used for the production of high quality and high clarity containers. PET is the most widely used polymer for injection stretch blow moulding of botdes. During the last two years, there has been a growing interest from brand owners and retailers in the use of PLA for manufacture of stretch blow moulded botdes for short shelf-life products such as mineral water and milk. 

Fig. 20.4 The injection stretch blow moulding process (ISBM).

Biaxial orientation of PET containers by mechanical means - axially by a stretch rod, radially by high-pressine air- during injection stretch blow moulding process introduces strain-induced crystallinity. Strain-induced crystallisation has a direct influence on the level of crystallinity of the final product. Factors, which influence the crystallinity level and the morphology, include the ISBM mould temperature, blow pressure and time to stretch the preform. 

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