A. Strong controllability of preform wall thickness, optimizing product performance • The injection molding stage of the injection blow molding machine can accurately control the wall thickness distribution of the preform through mold flow design and injection molding parameters (such as injection speed and pressure). For example, increasing the thickness of the preform at stress concentration sites such as the bottle mouth and bottle shoulder can enhance the mechanical strength of the finished product (such as impact resistance and pressure resistance); while the bottle body can be appropriately thinned to save materials, achieving "wall thickness distribution on demand" and taking into account both cost and performance. • This precise control is particularly important for pharmaceutical packaging, which can avoid problems such as penetration and deformation during drug storage caused by uneven wall thickness.

B. Excellent sealing performance, meeting high cleanliness requirements • Since the bottle mouth is formed in one injection molding, the thread has high precision and no burrs, and the sealing performance with the bottle cap is much better than the step-by-step process (the step-by-step process may cause the bottle mouth to deform due to the transfer of the preform). • The equipment can be configured with a clean room-level production environment (such as dust-proof and anti-static design), and with automatic demoulding and aseptic conveying systems, it can meet the strict requirements of the food and pharmaceutical industries for packaging cleanliness (such as GMP certification standards).

C. High material utilization rate and reduced waste • Integrated molding reduces the loss of preforms during the transfer process (such as scrapping caused by bumps and pollution), and the material utilization rate is usually 5%-10% higher than the step-by-step process. • For precious materials (such as special modified plastics and biodegradable materials), this advantage can significantly reduce production costs, which is in line with environmental protection and sustainable development trends.

D. ​​Convenient operation and relatively low maintenance cost • Modern injection blow molding machines adopt a modular design, and core components such as injection molding units, blow molding units, and hydraulic systems are independently partitioned, which is convenient for daily maintenance and component replacement. • The operation interface is intuitive, and workers can master parameter setting and troubleshooting after simple training, reducing dependence on highly skilled operators; at the same time, the equipment failure rate is lower than that of two independent devices (reducing mechanical failures in the connection link), and the long-term maintenance cost is more advantageous.

E. Suitable for multi-cavity production, further improving production capacity • The injection blow molding machine can be designed as a multi-cavity mold (such as 4 cavities, 8 cavities, 16 cavities) to form multiple products at one time. Since the injection and blow molding conditions of each cavity are controlled synchronously, the product consistency is good, and the single batch output is doubled, which is particularly suitable for scenarios with ultra-high batch demand such as beverage bottles and small medicine bottles. • In contrast, the multi-cavity production of the step-by-step process is prone to product errors due to the synchronization difference between the two devices, and the mechanical linkage design of the injection blow molding machine effectively avoids this problem.

F. Low sensitivity to process parameters and stronger stability • In the step-by-step process, the cooling state and storage time of the preform will affect the subsequent blow molding effect (such as molding defects caused by uneven heating); while the time interval from injection molding to blow molding of the preform in the injection blow molding machine is extremely short (usually within a few seconds), the material state is stable, and it is less affected by the ambient temperature and humidity and storage conditions, the production process is more stable, and the defective rate is lower.