Video: Making a Plastic Bottle: Injection Stretch Blow Moulding (ISBM)

A wide variety of bottles, jars, and other containers can be moulded using the versatile Injection Stretch Blow Moulding Process. Preforms can be immediately molded into final containers via the 1-Step method, or saved as stock for later use in the 2-Step method. We’ll break down the process using an integrated 2 Stage Injection Stretch Blow Moulding Machine. See how plastic goes from pellet to container in this quick video.

Injection Stretch Blow Moulding (ISBM)

Injection Stretch Blow Moulding (ISBM) happens in 2 Stages on a rotating platform, similar to IBM. In the case of ISBM, the process is oriented vertically.

Plastic is first extruded, meaning the pellets are fed into an extruder with a rotating screw, which, as it spins, created enough friction to melt the plastic pellets.

Stage 1:
The molten plastic is injected into a preform mould, which forms the final neck finish of the bottle.

Stage 2:
The preforms are transferred to the second station where they are captured by the cavity mould. A stretch rod is then introduced through the neck of the preform. The stretch rod stretches the still malleable plastic preform to the full length of the cavity mould.

Pressurized air is then introduced through the stretch rod, forming the resin to the shape of the final container.

Once the final formed containers are cooled, they are ejected from the rotation and conveyed to a final quality check, where pressurized air is blown into the sealed container to check for leaks.

Find out more about additional blow moulding processes today to include Extrusion Blow Moulding and Injection Blow Moulding.

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