Blow Molding Machine Selection Guide: Practical Strategies for Matching Capacity with Demand

When selecting equipment, it’s essential to comprehensively consider three core factors: product characteristics, production capacity requirements, and cost budget—avoiding the pitfalls of "over-engineering for small tasks" or "underpowered machines handling heavy loads."
Locate by product parameters
Dimensions and Materials: For producing large containers of 10L or more, it’s recommended to prioritize using a stock-tank extrusion blow-molding machine, with tank capacities up to 240 kg. Meanwhile, small, transparent pharmaceutical bottles are best suited for injection blow-molding machines, offering precision as high as ±0.02mm.
Performance requirements: Carbonated beverage bottles must withstand internal pressures exceeding 0.3 MPa; therefore, PET-specific blow molding machines equipped with high-precision wall-thickness control should be selected. For chemical containers requiring corrosion resistance, it is recommended to use PP/PE-specific screws and dies.

Capacity and Efficiency Alignment
A single-mold cavity injection blow molding machine can produce approximately 300–500 bottles per hour, while multi-cavity models (such as the 12-cavity version) can reach up to 6,000 bottles per hour. If daily production requirements exceed 100,000 bottles, it’s recommended to opt for a four-station injection blow molding machine, which helps reduce the cycle time by incorporating a pre-molding station. Additionally, it’s important to evaluate the equipment’s energy consumption—new servo-driven models are more than 30% more energy-efficient compared to traditional hydraulic machines.

Balancing Cost and Adaptability
When budgets are tight and product variety is high, an extrusion blow molding machine paired with multiple sets of molds is a viable option; however, for large-scale, standardized production, injection blow molding machines offer greater cost advantages. Additionally, plant conditions should be taken into account—extrusion blow molding machines typically stand 3 to 5 meters tall, while injection blow molding machines require dedicated space for mold head replacement and maintenance.