adminUnderstanding the Modern PET Preform Injection Molding Machine
A PET preform injection molding machine sits at the center of every water and beverage packaging operation, directly determining how fast preforms can be produced, how consistent multi-cavity output remains, and how competitive unit costs become. Producers evaluating this equipment typically weigh three factors: cycle speed, shot-weight repeatability across dozens or hundreds of cavities, and how quickly a complete line can be commissioned and brought online. DKM Machinery, working alongside its affiliated mold specialist SINO MOULD, has built its PET preform equipment line specifically around these three pressure points, combining dedicated injection machines, high-cavity molds, and take-out automation into a single, pre-tested production system.
The DKM-PET III Preform-Dedicated Injection Molding Machine
The core of this offering is the DKM-PET III Preform-Dedicated Injection Molding Machine, available as the DKM-350 PET III, DKM-450 PET III, DKM-550 PET III, and DKM-650 PET III. Each model is matched to a specific cavitation range: the DKM-350 PET III pairs with 48-cavity lines, the DKM-450 PET III with 72-cavity lines, the DKM-550 PET III with 144-cavity and 168-cavity preform molds, and the DKM-650 PET III with 144-cavity production lines.
Three design priorities define this series. First, efficiency: a standard electric accumulator enables synchronized plasticizing, combined with post-mold cooling technology, to shorten the overall molding cycle. Second, energy savings: nano far-infrared heating rings reduce the energy consumed during production. Third, stability: an optimized machine frame structure supports an injection repeat accuracy of ≤0.5‰, which is critical for maintaining uniform shot weight across high-cavity molds. DKM maintains safety stock for the 350T, 450T, 550T, and 650T models, allowing for immediate delivery rather than build-to-order lead times.
These specifications translate into measured cycle performance. A 144-cavity preform mold running on the DKM-650 PET III achieves a 12.8-second cycle time while producing an 11g, 29mm-neck preform. A 168-cavity mold on the DKM-550 PET III, producing an 11g preform with a BPF 26/21 neck, runs an 11-second cycle. On the 72-cavity line, the PET 450 configuration reaches a 12-second cycle for a 12g, 28mm preform, while the 48-cavity line with the PET 350 achieves a 16-second cycle for the same 12g, 28mm preform specification.
The Broader PET Series Machine Range
Alongside the PET III line, DKM also offers the PET Series Plastic Injection Molding Machine, a hydraulic toggle platform spanning 250 to 650 tons. This series is built around a PET-dedicated barrel and injection design intended to support consistent high-cavity preform output, and the machines are matched to 48, 72, 96, and 144-cavity preform lines. As with the PET III models, safety stock is held for the 350T, 450T, 550T, and 650T configurations, supporting faster equipment availability for water and carbonated beverage preform producers.
A Complete PET Preform Production Line
Rather than supplying the injection machine alone, DKM packages the equipment into a complete PET Preform Production Line that integrates the preform mold, the DKM-PET III injection molding machine, and an out-mold take-out robot. Three standard configurations illustrate this approach: Standard 1 pairs the PET 650 machine with 144 cavities and a take-out robot for an 11g/29mm preform at a 12.8-second cycle; Standard 2 pairs the PET 450 machine with 72 cavities and a dual-station external cooling robot for a 12g/28mm preform at a 12-second cycle; Standard 3 pairs the PET 350 machine with 48 cavities and a three-station external cooling robot for a 12g/28mm preform at a 16-second cycle.
Delivery speed is a defined differentiator. Standard 48/72-cavity production lines with standard 28/38mm neck finishes move from order confirmation to qualified shipment in 14 days, while custom, non-standard preform applications are delivered in 5 to 7 weeks. Every complete line undergoes a pre-factory acceptance test under simulated production conditions before shipment, and a secured supply chain with strategic inventory of critical components supports this compressed timeline.
Precision Molds: The PET Bottle Preform Mold
Behind every cycle-time figure is a mold engineered for multi-cavity consistency. SINO MOULD, together with its subsidiary SINO-PK, manufactures PET Bottle Preform Molds ranging from 8 to 168 cavities. Standard 48/72-cavity molds are delivered in 1 to 2 weeks, with a 48/72/96-cavity single-week delivery program also available. Key components are produced in Swedish S136 steel (HRC45-48), with the mold base in DIN1.2311, and tolerances are held to 0.01mm for uniform wall thickness and concentricity, with precision capability down to ±0.005mm. Standard neck finishes include PCO 1810, PCO 1881, and 28mm necks for preform weights typically between 12g and 30g. Custom cold-half molds can also be built from existing tooling to reduce customer investment, and fully custom non-standard molds — covering special neck finishes, unique bottle designs, or mixed-cavity configurations — are completed in 5 to 7 weeks. Every mold carries a 3-year warranty, with spare parts provided free of charge during that period.
Automation: Out-Mold Cooling & Pick Robot
Heavier preforms require additional cooling time without extending the mold cycle, and DKM addresses this with its Out-Mold Cooling & Pick Robot. Preforms under 16g are cooled directly on the robot gripper during part removal, while preforms over 16g are handled with the robot gripper combined with multi-station cooling units. Dual-station and three-station external cooling robots are matched specifically to the 72-cavity and 48-cavity line configurations described above, and a take-out robot is integrated into the 144-cavity configuration.
A One-Stop Approach to PET Preform Manufacturing
What distinguishes DKM Machinery and SINO MOULD in this category is the decision to deliver the injection machine, the preform mold, and the take-out automation as a single, jointly commissioned system rather than as separate purchases. This turnkey model is supported by over 200 sets of standard PET preform molds delivered worldwide, an intelligent standardized production workshop scheduled to become operational in October 2025, and over ten years of combined R&D expenditure representing 8% to 10% of sales revenue. Two 144-cavity PET preform production lines are currently running in normal production — one in Iraq and one in Iran — with customer acceptance test reports confirming satisfactory performance.
For water and beverage packaging producers evaluating a PET preform injection molding machine, the combination of defined cycle-time data, documented tolerance specifications, and a 14-day standard delivery window offers a measurable basis for comparison rather than general claims, positioning DKM Machinery and SINO MOULD as a technically documented option within the PET preform equipment category.
https://dkm.com/pet-preform-molding-machine/
DKM Machinery