Lesson
TYPE OF BLOW MOULDING
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a. Extrusion Blow Moulding (EBM)
- Most common method.
- Parison (tube of hot plastic) is extruded and then inflated.
- Used for bottles, containers, automotive parts.
b. Injection Blow Moulding (IBM)
- Preform is made via injection moulding, then transferred to blow moulding station.
- Offers better control of wall thickness.
- Common for pharmaceutical and cosmetic bottles.
c. Injection Stretch Blow Moulding (ISBM)
- Preform is stretched axially and radially before blowing.
- High strength and clarity.
- Used for PET bottles, especially for carbonated drinks.
d. Stretch Blow Moulding
- Involves stretching the preform during the blow stage.
- Can be one-step or two-step.
- Used for lightweight and high-clarity containers.
e. Co-extrusion Blow Moulding
- Multi-layered parisons are extruded.
- Allows for barrier layers, different material properties.
Used for food packaging, fuel tanks.
TYPE OF BLOW MOULDING
There are three main types of blow moulding:
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Extrusion Blow Moulding (EBM) – Most commonly used; ideal for containers and bottles.
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Injection Blow Moulding (IBM) – Used for small, precise containers like medical bottles.
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Injection Stretch Blow Moulding (ISBM) – Used for high-clarity bottles like soda or water bottles (PET).