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Polyethylene terephalate (PET) bottles and jars are created through the manufacturing process called Stretch Blow Molding (SBM). PET plastic is a packaging material that is widely recognized for its safety, product quality and environmental friendliness.
The Process
There are two SBM manufacturing techniques: the Single Stage Process and a Two-Stage Process. Both processes are divided into three similar and distinct steps. In the Single Stage Process, preforms are created and blown into bottles by a single machine in one continuous procedure. This process is a good choice when an application calls for special shapes like wide mouth bottles and jars. In the Two-Stage Process, the operation is split between two machines that operate independently. This division of manufacturing allows for more efficient management of throughput and is well suited to larger production runs.
One Or Two - Which Is The Right One?
While Single Stage and Two-Stage SBM have many similarities and share many of the same characteristics, there are differences. The specific circumstances and requirements of your product will help determine which of the two processes is the best choice. The best manufacturing process can also be determined by comparing and contrasting several key factors:
Speed:
Cycle times for the Single Stage Process can take as long as 43 seconds. In the Two-Stage Process this time may be reduced by as much as 22%.
Color:
While standard SBM preforms are clear, both Single Stage and Two-Stage Process preforms may be customized to match just about any color.
Quantity:
The Single Stage process requires a minimum order of 10,000, while the minimum order quantity for the Two-Stage Process is 50,000.
Recycling:
The PCR potential for containers produced by the Single Stage Process ranges from 25% to 100%. The Two-Stage Process offers a maximum PCR potential of 30%.
Neck Bead:
Bottles formed by the Single Stage Process can be produced without a neck bead. In the Two-Stage Process, a neck bead is required to carry and align the bottles into the RHB machine.
Extensive Comparison Of Single Stage And Two-Stage SBM
| SINGLE - STAGE ISBM |
2 - STAGE RHB |
|
| Process |
3 Stages Within One Machine | 3 Stages Across Two Machines |
| Speed |
Cycle Times Range From ~ 12 Seconds To 43 Seconds | 2-Stage Times Range From ~14 Seconds To 34 Seconds |
| Colors |
Great Ability To Color Match | |
| Minimums |
10,000 Pieces Minimum | 50,000 Pieces Minimum |
| Tooling Cost (with existing preforms) |
$2,500 for unit cavity: $15,000 For Full Production Tool | $7,000 for unit cavity: $15,000 For Full Production Tool |
| PCR Potential |
25% And 100% PCR | 30% PCR |
| Orientation Potential |
Threads On Necks Are Always Oriented | Necks Cannot Be Oriented Unless There Is A Notch Put Into The Preform Transfer Bead |
| Scuff Mark Concern |
Not A Worry | Potential Scuff Marks From Handling Preforms Into RHB Machine |
| Neck Bead |
No Concern, Bottles Can Be Produced With No 'Neck Bead" | A Neck Bead Is Required To Carry The Bottles Into The RHB Machine |
Interested In Learning More About PET Plastic Bottles And Jars?
If there are specific questions about PET plastic bottles and jars manufacturing process, contact O.Berk today.
Browse O.Berk's PET plastic bottles catalog here.