| 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.
Look for blow molding machines equipped with advanced features such as automatic bottle ejection systems, energy-efficient operations, and precision controls for mold temperature and pressure.
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.
| 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 |
Site requirements, air and water consumption sit with the Linear Blow Molding.
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.
The Rotary Blow Molding is the reference unit for this configuration.
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 Enhances PET Bottle Strength.
A linear machine moves preforms through heating and blowing in a straight path and suits lower outputs and frequent format changes. A rotary machine carries moulds on a wheel and suits high output with fewer changeovers.
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.
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.
Usually a cold base or an uneven stretch. The base is the last area to reach blowing temperature, and a short oven or a fast cycle leaves it under-stretched.
Country: Maldives
Product: PET Bottled Mineralized Water
Capacity: 24,000BPH (500ml); 2 Lines
Solution:Water Production Line
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)
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