How Extrusion Blow Molding Works: Watch the Six Steps
Watch how an extrusion blow molding machine works: six steps, animated drawings cut against real machines, in under three minutes.
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What you see in this video
- 0:00Introduction: the machine and the six-step cycleYellow clamp units with parisons hanging between them, jerry cans in production, then a six-panel drawing of the whole cycle.
- 0:21Step 1: Extrude the parisonThe extruder and die drawn in section with the die gap circled, then real parisons hanging between open mould halves.
- 0:42Step 2: Close the mouldThe drawn mould halves close and the pinch line is circled; on film, a steel mould closes on the machine.
- 1:01Step 3: Blow to shapeAir through the blow pin pushes the tube out to the cavity wall, then a real mould face at the blow pin.
- 1:21Step 4: CoolCooling-water channels and a cooling-time bar, then a large orange parison hanging beside a yellow clamp unit.
- 1:46Step 5: Open and ejectThe drawn mould opens over a conveyor as a take-out arm lifts the container; on film, an orange jerry can in the take-out arm.
- 1:59Step 6: Trim the flashFlash at the neck and base breaks away into a bin, real bottles with flash still on, then the trimmings carried back for regrind.
- 2:26Same six steps, bigger machinesA jerry can machine, a drum machine, then a two-station machine with yellow clamp units either side of the die head.
What the video shows, chapter by chapter
The film opens on a working machine: two yellow clamp units stand open, with soft, glowing parisons hanging between them, and a title card reads "Extrusion Blow Molding". Next come short clips of orange jerry cans leaving the mould, under the line "Bottles · Jerry cans · Drums · Tanks". A grid of six small drawings then lays out the whole cycle, and each panel lights up in turn as the narrator names it.
Step one is drawn in section: a screw extruder feeding the die head, the die gap circled in red, and the caption "Die gap sets the wall thickness". The drawing then shows the hollow tube coming down between two open mould halves, "Parison = hollow tube". The film cuts to the real thing: two pale parisons hanging between yellow clamp units, labelled "Parison" and "Hangs between the open mould halves".
Step two closes the drawn mould halves on the tube. The pinch line at the base is circled, then shown close up under "Pinch line = weld seam on the bottom". Between the drawings you see a polished steel mould closing on a machine with an orange frame, under "Water-cooled mould halves", and a close look at a steel mould face, "Sealed at the base".
Step three draws compressed air going in through the blow pin. Blue arrows press the tube outward until its outline matches the cavity: "Takes the exact shape of the mould". The real shot is a mould face at the blow pin, with white plastic around the neck.
Step four adds blue cooling-water channels to both mould walls and a "cooling time" bar that fills up, under "Cooling is the longest step" and "Thicker wall = longer cooling". It ends on a real machine: a large orange parison hangs beside a yellow clamp unit.
Step five opens the drawn mould over a roller conveyor while a take-out arm lifts the container: "Mould opens". On film, an orange jerry can is held in the take-out arm as it leaves the mould, under "Take-out arm / conveyor".
Step six shows the flash at the neck and at the base breaking away and dropping into a bin: "Flash at the neck and pinch-off". Real yellow bottles appear with the flash still attached. An arrow then carries the trimmings back to the extruder, "Reground and reused", and a circular arrow closes the loop: "The cycle repeats". The six-panel grid returns and lights up once more, panel by panel.
The last chapter drops the drawings and stays on real machines. A jerry can machine and a drum machine run the same cycle at a larger size, under "Jerry can machine", "Drum machine" and "Same six steps". Then a blue-framed machine with two yellow clamp units, one either side of the die head, runs under "Machines built by our sister factory" and "Moulds made in-house since 2007". The film closes on www.amanmachine.com and our WhatsApp number.
See full specifications on the extrusion blow molding machines and moulds page.
Related: read the six steps in full in our extrusion blow molding process, step by step guide.
Tell us about your container and the output you need, and we will size the machine and the mould. Attach a drawing or photos and get an exact quote within 24–48 hours. Prefer chat? Send it on WhatsApp: +1 773-386-2484.