Operating at maximum rated cavity count for a given ZQ model and container format does not inherently reduce quality — Korea Ever-Power’s ZQ series machines are rated at the cavity counts in the reference table under standard Korean pharmaceutical production conditions, meaning these cavity counts are validated production configurations rather than theoretical limits. Quality risk occurs when cavity count exceeds the machine’s rated limit for a format — typically driven by a Korean customer requesting more cavities than the standard configuration to reduce mould investment. At above-rated cavity counts, three quality risk factors emerge: hot runner gate imbalance (more gates at the same manifold pressure produces greater flow variation across the outer versus inner gates of the runner tree); injection clamping margin reduction (less margin against flash at any gate if injection pressure peaks above the per-cavity average); and mould cooling inadequacy (more cavities in the same platen footprint means less cooling channel area per cavity, increasing cycle-to-cycle temperature variation and dimensional variation). Korea Ever-Power does not approve above-rated cavity counts on ZQ series machines — the rated cavity count is the engineering design point verified by Korea Ever-Power’s process engineers at production conditions. Requests for above-rated cavity count at a given format are addressed by recommending the next ZQ model.

Yes — this is one of IBM’s key commercial advantages for Korean contract packaging factories. The ZQ machine’s machine parameters (injection pressure, barrel temperatures, blow air pressure, cycle timing) are set independently for each mould set, stored as named production recipes in the ZQ control system, and recalled by the operator when a mould set is changed. A ZQ80 that runs a 20-cavity 10 ml pharmaceutical mould set for two shifts, then changes to a 6-cavity 500 ml shampoo mould set, then changes to a 10-cavity 100 ml cosmetic jar mould set — recalls three separate production recipes and operates at different cavity counts, cycle parameters and material temperatures for each format without reconfiguring any machine hardware. The only hardware change during format change is the three-component mould set (injection mould, blow mould, stripping tool) and, if the material changes, the barrel purge between materials. Korea Ever-Power’s ZQ control system stores up to 99 named production recipes, supporting the multi-format Korean contract packaging operations that represent the majority of Korean IBM commercial production environments.

Korea Ever-Power’s dual hydraulic system (standard on ZQ80, ZQ110 and ZQ135) uses two independent hydraulic circuits — one dedicated to the injection phase and one dedicated to the blow and stripping phases — that operate simultaneously rather than sequentially. This parallel operation has two direct effects on cavity count planning. First, it eliminates the pressure cross-contamination between injection and blow circuits that occurs in single-circuit competitor IBM machines: on single-circuit machines, the hydraulic system must fully complete the injection phase before transitioning to blow phase, and residual injection pressure fluctuation can affect the blow air pressure consistency between cavities. At high cavity counts (20–30), this cross-contamination on single-circuit machines produces inter-cavity weight standard deviation of 5–8% — above the ±4% CV% limit for Korean pharmaceutical IBM containers. Korea Ever-Power’s dual hydraulic system produces inter-cavity weight standard deviation of 2–4% at full rated cavity count — within pharmaceutical specification. Second, the dual hydraulic system delivers 20–30% energy saving versus single-circuit machines at equivalent rated cavity count — documented in Korean customer factory energy measurements — because the dual circuit operates each pump at its optimal efficiency point rather than requiring one pump to serve both the high-pressure injection phase and the lower-pressure blow phase alternately. This energy saving compounds with cavity count: at 30 cavities on the ZQ135, the 20–30% energy saving versus a single-circuit 30-cavity competitor machine saves approximately 15,000–25,000 kWh per Korean two-shift year at full utilisation, reducing Korean factory electricity cost by approximately KRW 2.5–4.0M per year per machine.

IBM mould cost scales with cavity count approximately linearly per cavity for the injection mould and blow mould components — doubling the cavity count roughly doubles the mould cost, though with some fixed cost amortisation for hot runner manifold design and mould base. The per-cavity mould cost for Korean pharmaceutical 10 ml HDPE IBM moulds (S136 stainless steel, pharmaceutical-grade finish) is approximately KRW 2.5–4.0M per cavity for the complete three-component mould set (injection mould + blow mould + stripping tool), meaning a 20-cavity ZQ80 pharmaceutical mould set costs approximately KRW 50–80M and a 30-cavity ZQ135 mould set costs approximately KRW 75–120M. The per-cavity mould cost decreases slightly at higher cavity counts because the hot runner manifold’s engineering cost is fixed regardless of gate count above 12 cavities — the 19th and 20th gate cost less to add than the 1st and 2nd gate on the same manifold. This means that maximising cavity count within a given ZQ model (using all available clamping force and platen area) produces the lowest capital cost per unit of annual capacity, because the additional mould cost per added cavity is less than the machine stepping cost at the ZQ model boundary. Korea Ever-Power provides itemised mould cost estimates at specific cavity counts for Korean customers evaluating the trade-off between higher-cavity same-model moulds and lower-cavity next-model machines.