DKM PET Preform Machine: 14-Day Lines With 12-Second Cycles

Global demand for bottled water and beverages has pushed PET preform producers to rethink how they select injection molding equipment. Cycle time, cavity consistency, and delivery speed are no longer secondary considerations—they directly determine whether a production line can meet market windows and unit cost targets. Within this context, the DKM PET preform machine, developed by DKM Machinery and paired with molds from SINO MOULD, offers a documented case study in how dedicated engineering addresses these pressures.

Why PET Preform Producers Need a Dedicated Machine

High-cavity PET preform production creates a specific set of engineering demands: short molding cycles, low energy consumption per shot, and injection repeat accuracy tight enough to keep 48, 72, 96, or even 144 cavities producing uniform parts. General-purpose injection molding machines are not built around these constraints, which is why DKM positions its DKM-PET III Preform-Dedicated Injection Molding Machine specifically for this application rather than as an adapted general machine.

Inside the DKM-PET III Preform-Dedicated Injection Molding Machine

The DKM-PET III line includes four models—DKM-350 PET III, DKM-450 PET III, DKM-550 PET III, and DKM-650 PET III—each matched to a defined cavity 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. This model-to-cavity pairing structure means buyers can select equipment based on their target output rather than retrofitting a general machine to fit mold requirements.

Technical Specifications and Repeatability

Three engineering features define the DKM-PET III’s differentiated value. First, a standard electric accumulator combined with synchronized plasticizing and post-mold cooling technology shortens the overall molding cycle. Second, nano far-infrared heating rings reduce production energy consumption. Third, an optimized machine frame structure delivers injection repeat accuracy of ≤0.5‰, which supports stable multi-cavity preform production—a critical factor when a single shot must fill well over a hundred cavities with uniform weight and dimensions.

These specifications translate into measurable results. A 144-cavity preform mold running on a 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, with an 11g product weight and BPF 26/21 neck, completes an 11-second cycle. On the smaller end of the range, a 72-cavity standard line built around the PET 450 machine achieves a 12-second cycle for a 12g, 28mm preform, while a 48-cavity standard line with the PET 350 machine completes a 16-second cycle for the same 12g, 28mm preform specification.

For producers requiring immediate equipment access, DKM maintains safety stock for the 350T, 450T, 550T, and 650T PET III models, supporting rapid deployment for standard applications.

From Machine to Turnkey Line: The PET Preform Production Line

Beyond the standalone machine, DKM offers a complete PET Preform Production Line that integrates the preform mold, the DKM-PET III injection molding machine, and a take-out robot into a single pre-commissioned system. This turnkey approach addresses a common pain point for beverage packaging producers: long equipment lead times that delay market entry.

Three standard configurations illustrate this integration. Standard 1 uses a PET 650 machine with 144 cavities and a take-out robot to produce an 11g/29mm preform on 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 on a 12-second cycle. Standard 3 uses a PET 350 machine with 48 cavities and a three-station external cooling robot for a 12g/28mm preform on a 16-second cycle.

Standard 48/72-cavity production lines with standard 28/38mm neck finishes are delivered from order confirmation to qualified shipment in 14 days. Custom, non-standard applications are delivered in 5 to 7 weeks. Each line undergoes a pre-factory acceptance test under simulated production conditions before shipment, and DKM maintains strategic inventory of critical components to secure the supply chain for these delivery timelines.

Mold Precision: PET Bottle Preform Mold by SINO MOULD

A PET preform machine performs only as well as the mold it runs. SINO MOULD, DKM’s sister company, manufactures PET Bottle Preform Molds ranging from 8 to 168 cavities, with additional production capacity through its subsidiary SINO-PK. Standard 48/72-cavity molds are delivered in 1 to 2 weeks, with a 48/72/96-cavity single-week delivery program available for qualifying configurations.

On the technical side, key mold components use Swedish S136 steel (HRC45-48) with a mold base in DIN1.2311, achieving tolerances down to 0.01mm for uniform wall thickness and concentricity, with ±0.005mm precision capability for the tightest applications. Standard neck finishes include PCO 1810 and PCO 1881, along with 28mm necks for preform weights typically between 12g and 30g. Custom cold-half molds built from existing mold bases are also available to reduce customer tooling investment, while fully custom non-standard preform molds—covering special neck finishes, unique bottle designs, and mixed-cavity layouts—are delivered in 5 to 7 weeks.

SINO MOULD brings over 20 years of multi-cavity preform mold manufacturing experience to this work, with more than 200 sets of standard PET preform molds delivered worldwide. All mold production is backed by a 3-year warranty with free spare parts during the warranty period, and an intelligent standardized production workshop became operational in October 2025 to support continued output.

Automation: Out-Mold Cooling & Pick Robot

Heavier preforms present a specific automation challenge: cooling them fast enough without extending the mold’s own cycle time, while avoiding deformation during handling. DKM addresses this with a weight-based cooling strategy. Preforms under 16g are cooled directly on the robot gripper during part removal, while preforms over 16g are handled through robot gripper cooling combined with multi-station cooling units. Dual-station and three-station external cooling robots are matched to the 72-cavity and 48-cavity line configurations respectively, while a take-out robot is integrated into the 144-cavity configuration.

Proven Track Record and Global Delivery

Documented customer cases reinforce these specifications in field conditions. Two 144-cavity PET preform production lines are currently operating in Iraq and Iran, both running under normal production, with customer acceptance test reports confirming satisfactory performance and payment settled in full for both projects. A separate 72-cavity PET preform production line with an out-mold cooling system has produced a 13.5g, 28mm neck preform at a 12-second cycle for a customer requiring fast delivery. Standard 48 and 72-cavity preform mold orders have also been completed from order to shipment within 2 weeks for producers requiring rapid turnaround.

Engineering Foundation Behind the Performance

These outcomes are not isolated achievements. DKM Machinery and SINO MOULD operate as a technology-driven manufacturer headquartered in Zhejiang, China, with business coverage across more than 100 countries and regions. Over the past ten years, R&D expenditure has accounted for 8%–10% of the company’s sales revenue, supporting a European technology platform that includes an Italy Technical Office established in 2018 and an Italy Technology Center established in 2023. This sustained investment underpins the cycle-time and repeatability figures documented across the DKM-PET III range.

For PET preform producers evaluating equipment, the relevant questions are cavity-specific cycle time, injection repeat accuracy, mold delivery speed, and whether the machine, mold, and automation are commissioned as a working system before shipment. On each of these points, the DKM-PET III Preform-Dedicated Injection Molding Machine, supported by SINO MOULD tooling, provides documented, model-specific data rather than general claims—information that producers can weigh directly against their own production targets.