Extrusion Blow Molding (EBM)
An extruder drops a parison (hot, hollow tube of plastic) between two mold halves. One end of the gap is sealed while the other end is left open. Air is injected through the open end, forcing the malleable plastic against the mold walls. Upon cooling, the plastic retains the contour of the mold. This process can produce very large containers but is not suitable for all materials.
Injection Blow Molding (IBM)
This two-step process begins with injection molding a preform, which is then heated, placed in a blow mold and inflated. Compared to EBM, this process allows for more careful control over part walls and results in better transparency and surface quality.
Injection Stretch Blow Molding (ISBM)
This method incorporates an additional step where the injection–molded preform is heated, then mechanically stretched before inflation. This contributes to the part’s strength and wall uniformity.