| 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 |
Sizing for this duty runs through the Linear Blow Molding, where the valve count is set out.
Zone by zone along the preform, with more heat at the body and less at the neck. The profile follows the preform geometry and the bottle design. It is set once and checked on a schedule, because lamp ageing shifts it slowly.
Valve count, utility schedule and footprint sit 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 Blow Molding Machines: In-House PET Bottle Production.
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.
High-pressure air, typically in the range set by the machine builder for the bottle size. The exact figure and the consumption belong in the utility schedule; it is the largest energy item on a PET line.
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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