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What tonnage injection molding machine is suitable for 500ml mineral water bottle preforms?
- Especificacions
For mass production of standard 500ml mineral water bottle preforms, injection molding machines with a tonnage of 270 tons to 300 tons are the most suitable and industry-standard configuration, a choice determined by comprehensive factors including preform projection area, mold cavity quantity, clamping force demand, and production efficiency requirements. The single preform of a 500ml mineral water bottle has a fixed projection area and mold opening stroke, and the 270T–300T machine perfectly balances clamping force, mold installation space, and production cost for this product. In actual industrial production, this tonnage model is mainly matched with 16-cavity, 24-cavity, and 32-cavity preform molds, covering small-batch trial production, medium-scale stable production, and large-scale mass production demands respectively. A 16-cavity mold is suitable 
for new factories with small order volumes and flexible production demands, while 24-cavity and 32-cavity configurations are the mainstream choices for formal mass production, achieving ideal cycle time and output.
for new factories with small order volumes and flexible production demands, while 24-cavity and 32-cavity configurations are the mainstream choices for formal mass production, achieving ideal cycle time and output. The core advantage of the 270T–300T machine is its sufficient and stable clamping force. PET preform high-speed injection will generate strong mold opening pressure; insufficient clamping force will cause mold flash, burrs on preform mouths, uneven wall thickness, and mold deformation after long-term operation. This tonnage equipment adopts a reinforced four-column clamping structure, which can maintain high mold closing accuracy under long-term high-frequency operation and effectively avoid defective products caused by mold displacement. In addition to matching cavity quantity, the 270T–300T servo high-speed machine is optimized for 500ml preform molding parameters, with fast injection response and accurate pressure and speed segmentation control, which can complete thin-wall preform filling in an instant and ensure consistent weight and transparency of each preform. For factories pursuing higher output, upgrading to a 32-cavity mold with a 300T machine can increase daily output by nearly 30% without sacrificing product quality.
It is worth noting that choosing a machine with excessive tonnage will cause unnecessary energy waste and increase equipment investment and floor space costs, while too small tonnage will lead to insufficient clamping force, frequent defects, and shortened mold service life. For special upgraded 500ml preforms such as thickened high-pressure resistant bottle blanks, appropriately increasing the machine tonnage to 320T is recommended to adapt to larger mold load. Overall, the 270T–300T high-speed servo PET preform injection molding machine is the most cost-effective, estable, and widely recognized standard configuration for 500ml mineral water preform production in the industry.
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