128 Cavities PET Preform Mould

The core value of a precision preform mold lies in controlling the weight variation of each preform to within ±0.1 grams(15g preform). We employ a grouped cavity processing technique to ensure synchronous filling across all mold cavities, resulting in a highly uniform wall thickness distribution-both axially and circumferentially. For water preform production-where lightweighting is a priority-our molds enable a stretch ratio of up to 30% even at minimal wall thicknesses, effectively reducing the final bottle weight.

The cooling channels within our preform molds utilize spiral-wrap core pins; this design generates turbulent flow within the mold cavities, boosting the heat transfer coefficient by 35%. An independent cooling circuit for the neck ring instantly "freezes" the thread dimensions, preventing deformation during ejection. By optimizing the distance between the cooling channels and the mold cavities via Finite Element Analysis (FEA), we have compressed the cycle time to an industry-leading range of just 8 seconds, significantly increasing the daily output per mold.

The ejector plate and sliders of this preform mold are equipped with graphite-bronze bushings and a centralized lubrication system, effectively preventing grease contamination of the preforms. All moving components feature a Diamond-Like Carbon (DLC) coating, resulting in a friction coefficient of less than 0.1; this ensures smooth operation during high-speed mold opening and closing, extending maintenance intervals to over 5 million cycles. This exceptional durability translates directly into reduced downtime and lower costs for spare parts.

By simply swapping out the neck ring and core pin assemblies, this preform mold can be rapidly reconfigured to accommodate various international standard neck finishes-such as PCO 1881, 30/25, and 29/25. This means a single mold base can cover a diverse product portfolio-including purified water, carbonated soft drinks, and hot-fill juices-significantly enhancing production line flexibility and minimizing the need for additional capital investment.