1. General & Process
Q1: What is the key difference between a single-stage and a two-stage machine?
A: The core difference lies in process integration. A single-stage machine completes the preform injection, conditioning, stretching, and blow molding in one continuous, in-line cycle. A two-stage machine involves two separate steps: first manufacturing and cooling preforms, then reheating and blow molding them in a separate machine.
Q2: What are the main advantages of the single-stage process?
A: Key advantages include:
Lower energy consumption (no need to reheat preforms).
Superior bottle clarity & mechanical properties due to controlled "hot preform" processing.
Reduced footprint & logistics (one machine vs. two).
Less preform handling, reducing contamination risk and surface defects.
Q3: Is it suitable for producing all types of PET containers?
A: It is excellent for a wide range, especially high-clarity bottles (water, beverages), hot-fill containers, and lightweight bottles. For very high-volume, standardized containers (e.g., simple water bottles), two-stage might offer higher speeds. We can assess your specific product for the best fit.
2. Technical & Performance
Q4: What is the typical output (bottles/hour) of your machine?
A: Output depends on the number of cavities and bottle weight/size. For example, a 8-cavity machine can produce approximately 2,000 – 3,000 bottles per hour for a 30ml pharma bottle. We provide detailed cycle time calculations based on your specific preform design.
Q5: How fast can you change over to a different bottle design?
A: Our machines are designed for efficient changeover. With quick-change mold systems and standardized neck handling, a full format change can typically be completed in 2 to 4 hours, minimizing downtime.
Q6: Can it process recycled PET (rPET)?
A: Yes. Our machines are compatible with rPET. We recommend a higher percentage of rPET in the inner layers (using co-injection options if needed) to maintain bottle appearance and performance. Proper drying and filtration are crucial.
Q7: What about material savings (lightweighting)?
A: The single-stage process offers excellent material distribution control, allowing for effective lightweighting – often 1-2 grams lighter than two-stage for the same bottle performance, providing significant material cost savings.
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