| Types | Linear and rotary blow moulding |
| Input | PET preform, heated in an oven before blowing |
| Output | Bottle matched to the filler neck and format |
| Key control | Preform temperature profile, mould cooling, stretch ratio |
| Integration | Stand-alone, or inside a combiblock |
| Key decision | Blow in-house or buy bottles |
The preform temperature profile decides where the material goes. Too cold and the base is thin; too hot and the wall stretches unevenly. The mould cools the bottle into shape, and the stretch ratio set by the rod and the mould height fixes the wall distribution.
A mould change is a mechanical operation: mould halves, bottom insert, stretch rod height, oven recipe and gripper settings. On a linear machine it is a scheduled stop measured in tens of minutes; on a rotary machine it is longer because there are more cavities to set.
| Machine | Output pattern | Format changes |
|---|---|---|
| Linear | Lower output, more formats | Frequent, shorter changeover |
| Rotary | High output, fewer formats | Longer changeover, more cavities |
| Two-stage on site | Preform bought in | Mould per format still required |
| Combiblock integrated | Linked to filler | Changeover stops the whole block |
Valve count, utility schedule and footprint sit on the Linear Blow Molding page.
Neck finish decides the filler and capper change parts. Body shape decides the star wheels and guide rails. Wall thickness decides whether the bottle survives the filler and the conveyor. A lightweighting project that changes the base is a filling line project as much as a bottle project.
Rated output, change parts and services are listed on the Rotary Blow Molding page.
Cycle time and bottle appearance. Scale in the cooling channels reduces heat transfer, so the bottle stays soft and the cycle stretches. Water treatment for the mould circuit is part of the blowing installation, not an afterthought.
The same question is worked through from another angle in How Blow Molding Machines Improve PET Bottle Durability.
One preform per bottle. The preform weight is the bottle weight, so preform lightweighting is the main material saving, and it changes the blowing recipe and often the mould.
Yes, with a mould set per format and an oven recipe per preform. Changeover time, not capability, is the limit, and it is why plants with many formats often keep a separate small machine.
Indirectly. Wall thickness distribution and base quality decide the bottle's mechanical strength and its barrier performance. A bottle that passes the drop test can still lose carbonation if the wall is thin at the base.
It follows the bottle design and the shelf life requirement, and it is set with the preform supplier. Lighter preforms save material and reduce the process window, so the blowing recipe has to be re-validated.
Country:Kazakhstan
Product: PET Bottled Sparkling Water, Canned Soft Drink, Canned Tea
Capacity: 25000CPH (250ml)
Solution:Three Lines,7000BPH(1.5L), 15000CPH(330ml),15000CPH(450ml)
+86 13921964455
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