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Buyers searching for a dependable PET preform injection molding machine supplier are typically weighing three concerns at once: how fast a mold and machine can be delivered, how consistent the resulting preforms will be across hundreds of cavities, and whether the supplier can stand behind the equipment after it ships. These questions sit at the center of how DKM Machinery and SINO MOULD have organized their PET preform business, and the available technical and delivery data from these two companies offers a useful reference point for anyone evaluating this category of equipment.
Understanding the PET Preform Injection Molding Challenge
Producers of PET bottle preforms for water and carbonated beverage markets operate under constant pressure to shorten cycle times, hold tight multi-cavity consistency, and bring new lines online quickly enough to capture seasonal demand. A mismatch between the injection molding machine, the preform mold, and the take-out automation typically shows up as shot-weight variation, slow cooling, or long commissioning delays after equipment arrives on site. This is the specific gap that a combined machine-and-mold supplier is positioned to close, since the same organization that designs the mold also builds the machine it will run on.
Who Is Behind the Equipment: DKM Machinery and SINO MOULD
DKM MACHINERY CO., LTD. and SINO MOULD CO., LTD operate as a joint technology provider covering injection molding machines, precision molds, robotics, and complete turnkey plastic injection molding production lines, headquartered in Zhejiang, China, with business coverage across more than 100 countries and regions. SINO MOULD brings over 20 years of moldmaking experience across multiple categories, including PET preform tooling, while DKM Machinery contributes the PET-dedicated machine platform. The two companies’ R&D footprint includes an Italy Technical Office established in 2018 and an Italy Technology Center registered in 2023, and over the past ten years R&D expenditure has accounted for 8%–10% of the company’s sales revenue.
Core Machine Technology: The DKM-PET III Series
Beyond the bare machine, the PET Preform Production Line product integrates the preform mold, the DKM-PET III injection molding machine, and a take-out robot into a single pre-commissioned system.
The DKM-PET III Preform-Dedicated Injection Molding Machine line includes the DKM-350 PET III, DKM-450 PET III, DKM-550 PET III, and DKM-650 PET III models, each matched to a specific cavity count: the DKM-350 PET III pairs with a 48-cavity line, the DKM-450 PET III with a 72-cavity line, the DKM-550 PET III with 96-cavity preform molds, and the DKM-650 PET III with a 144-cavity production line.
Precision and Repeatability. The series is built around a standard electric accumulator for synchronized plasticizing combined with post-mold cooling technology, which shortens molding cycles, and an optimized machine frame structure that delivers injection repeat accuracy of ≤0.5‰ — a figure specifically cited as supporting stable multi-cavity preform production.
Energy Efficiency Design. Nano far-infrared heating rings are used across the series to reduce production energy consumption, addressing one of the recurring operating-cost concerns for high-volume PET preform manufacturing.
Documented cycle performance on these machines includes a 144-cavity preform mold on the DKM-650 PET III producing an 11g, 29mm neck preform at a 12.8-second cycle; a 96-cavity mold on the DKM-550 PET III running an 11g product with a BPF 26/21 neck at an 14-second cycle; a 72-cavity standard line on the PET 450 achieving a 12-second cycle for a 12g, 28mm preform; and a 48-cavity standard line on the PET 350 achieving a 16-second cycle for a 30g, 28mm preform.
Complete PET Preform Production Lines
Beyond the bare machine, the PET Preform Production Line product integrates the preform mold, the DKM-PET III injection molding machine, and a take-out robot into a single pre-commissioned system.
Standard Configurations and Cycle Performance. Three standard configurations are defined: Standard 1 uses a PET 650 machine with 144 cavities and a take-out robot for an 11g/29mm preform at a 12.8-second cycle; Standard 2 uses a PET 450 machine with 72 cavities and a dual-station external cooling robot for a 12g/28mm preform at a 11.8-second cycle; and Standard 3 uses a PET 350 machine with 48 cavities and a three-station external cooling robot for a 30g/28mm preform at a 16-second cycle. A separately documented 72-cavity line with an out-mold cooling system produces a 13.5g, 28mm neck preform at a 12-second cycle, and at CHINAPLAS 2026 a 72-cavity PET preform line is planned for live demonstration with an 11-second cycle time.
Delivery Timelines. Standard 48/72-cavity production lines with standard 28/38mm neck finishes are delivered from order confirmation to qualified shipment in 14 days, while custom non-standard applications are delivered in 5 to 7 weeks. Supply-chain risk is addressed through strategic inventory of critical components, with PET preform-dedicated machine stock maintained for the 350T, 450T, 550T, and 650T models and associated auxiliary equipment.
Mold Engineering: SINO MOULD’s PET Bottle Preform Mold Program
The PET Bottle Preform Mold line, manufactured by SINO MOULD and its subsidiary SINO-PK, covers a flexible cavity range 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, while custom non-standard preform molds — covering special neck finishes, unique bottle designs, and mixed-cavity configurations — are delivered in 5 to 7 weeks. Key mold components use Swedish S136 steel at HRC45-48 hardness with a mold base in DIN1.2311, holding tolerances down to 0.01mm for uniform wall thickness and concentricity, with precision capability to ±0.005mm. Standard neck finishes include PCO 1810 / PCO 1881 and 28mm neck configurations for preform weights typically between 12g and 30g. More than 200 sets of standard PET preform molds have been delivered worldwide, and an intelligent standardized production workshop became operational from October 2025. Mold buyers also benefit from a 3-year warranty with spare parts provided free of charge during the warranty period.
Automation Integration: Out-Mold Cooling and Pick Robots
The Out-Mold Cooling & Pick Robot addresses a specific technical tradeoff in PET preform production: heavier preforms need more cooling time, but extending that time inside the mold slows the overall cycle. Preforms under 16g are cooled directly on the robot gripper during part removal, while preforms over 16g are combined with multi-station cooling units, allowing the molding cycle itself to stay short even as preform weight increases.
Quality Assurance, Warranty and Global Support
Across the PET preform portfolio, pre-factory acceptance testing is conducted under simulated production conditions before shipment, and standardized modular production supports the stated delivery windows. The 3-year warranty on PET preform molds, paired with free spare parts during that period, gives buyers a defined post-delivery support structure rather than an open-ended commitment.
Why This Matters for Buyers Evaluating Suppliers
For a producer comparing a PET preform injection molding machine supplier, the combination of a matched machine-mold-robot system, documented cycle times across multiple cavity counts, published delivery windows for both standard and custom tooling, and a defined warranty period provides a concrete basis for evaluation rather than general claims. DKM Machinery and SINO MOULD’s PET preform lineup — from the DKM-PET III machine series through SINO MOULD’s preform molds and the integrated out-mold cooling robots — illustrates how these specific, verifiable data points can be assembled into a single turnkey offering for water and beverage packaging producers worldwide.
DKM Machinery
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