DKM PET Preform Machine: Precision Molding, Fast Cycle Times

Why Producers Are Turning to the DKM PET Preform Machine

Beverage and water packaging producers face a common challenge: equipment that cannot keep pace with high-cavity mold output while still delivering consistent, repeatable preform quality. DKM Machinery, operating alongside SINO MOULD, has built its PET preform equipment line specifically to answer this challenge — combining dedicated injection machines, high-cavity molds, and automated handling into a single, pre-commissioned production system.

As a technology-driven manufacturer integrating R&D and manufacturing of high-end injection molding equipment, DKM positions its PET preform solutions as part of a broader one-stop turnkey plastic injection molding production line, covering machines, precision molds, and robotics matched as original equipment.

The PET Series and DKM-PET III Machine Platforms

DKM offers two complementary machine platforms purpose-built for preform manufacturing. The PET Series Plastic Injection Molding Machine is a hydraulic toggle design ranging from 250 to 650 tons, engineered with a PET-dedicated barrel and injection design that supports consistent high-cavity preform production. These machines are matched to 48, 72, 96, and 144-cavity preform lines, with safety stock held for 350T, 450T, 550T, and 650T models to support immediate availability.

Building on this foundation, the DKM-PET III Preform-Dedicated Injection Molding Machine series — comprising the DKM-350, DKM-450, DKM-550, and DKM-650 PET III models — introduces a standard electric accumulator with synchronized plasticizing combined with post-mold cooling technology to shorten molding cycles. Nano far-infrared heating rings reduce production energy consumption, while an optimized machine frame structure delivers injection repeat accuracy of ≤0.5‰, a figure that directly supports stable multi-cavity preform consistency across large mold counts.

Each DKM-PET III model is paired to a specific cavity configuration: the DKM-550 PET III pairs with 144-cavity and 168-cavity preform molds, the DKM-650 PET III pairs with a 144-cavity production line, the DKM-450 PET III pairs with a 72-cavity line, and the DKM-350 PET III pairs with a 48-cavity line. Safety stock is maintained for all four tonnage classes, allowing for immediate delivery when production schedules are tight.

Demonstrated Cycle Performance Across Cavity Counts

Cycle time is often the deciding factor for preform producers evaluating new equipment, and DKM documents specific results across its cavity range. 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 produces an 11g product with a BPF 26/21 neck finish in an 11-second cycle. On the 72-cavity standard line paired with the PET 450 machine, cycle time reaches 12 seconds for a 12g, 28mm preform, while the 48-cavity standard line with the PET 350 machine achieves a 16-second cycle for the same 12g, 28mm preform specification. More recently, molding cycles for a 26g preform have been reduced to 12 seconds, supported by mold component tolerance control down to 0.005mm.

Complete Production Line Integration

Rather than supplying machines in isolation, DKM delivers the PET Preform Production Line as an integrated system combining the preform mold, the DKM-PET III injection molding machine, and a take-out robot. Three standard configurations illustrate this integration: 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.

Automation is tailored to preform weight. The Out-Mold Cooling & Pick Robot cools preforms under 16g directly on the robot gripper during part removal, while preforms over 16g are handled through the gripper cooling combined with multi-station cooling units — an approach designed to compress the overall molding cycle for larger preforms without compromising dimensional stability.

Standard 48/72/96-cavity production lines with standard 28/38mm neck finishes are delivered within 14 days from order confirmation to qualified shipment, while custom, non-standard applications are delivered in 5 to 7 weeks. Every line undergoes a pre-factory acceptance test under simulated production conditions before shipment, and DKM maintains strategic inventory of critical components to secure supply chain continuity.

Mold Precision from SINO MOULD

The mold side of the equation is supplied by SINO MOULD and its subsidiary SINO-PK, offering PET Bottle Preform Molds across a flexible cavity range from 8 to 168. Key components are manufactured in 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 precision capability to ±0.005mm. Standard neck finishes include PCO 1810 and PCO 1881 configurations along with 28mm necks for preform weights typically between 12g and 30g. Standard 48/72-cavity molds are delivered in 1 to 2 weeks, backed by a 3-year warranty with free spare parts during the warranty period. Custom non-standard preform molds — including special neck finishes, unique bottle designs, and mixed-cavity configurations — are completed in 5 to 7 weeks, drawing on over 20 years of multi-cavity preform mold manufacturing expertise and more than 200 sets of standard PET preform molds delivered worldwide.

Proven in the Field

Field results reinforce these specifications. 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 and payment settled in full for both projects. A 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, with customers placing repeat orders to expand capacity. Standard 48 and 72-cavity preform molds have also been delivered within two weeks of order confirmation, again followed by repeat orders from satisfied customers.

A Complete Answer for Preform Producers

By combining the PET Series and DKM-PET III machine platforms, SINO MOULD’s precision preform molds, and matched take-out and cooling robotics into pre-tested turnkey lines, DKM Machinery and SINO MOULD address the core pain points of PET preform production: long equipment lead times, inconsistent multi-cavity output, and slow cycle times. For producers evaluating a PET preform machine investment, the documented cycle data, cavity-matched configurations, and field-proven delivery timelines provide a concrete basis for comparison.