Case Study: 4-Cavity Refrigerated Sealed Container Mold

How we helped the customer reach nearly 10,000 pieces per day while reducing unit cost by about 30%

1. Customer Pain Points: Low Output, High Unit Cost, and Frequent Mold Repair

Last year I met a food-packaging customer supplying fresh-food e-commerce channels and supermarket chains. Their biggest complaints were straightforward:

• Capacity: the existing 2-cavity mold ran at about a 45-second cycle and produced only around 3,800 pieces per day, far below growing order demand.
• Unit cost: too few cavities and too long a cycle made electricity, labor, and equipment occupancy expensive on a per-piece basis.
• Mold reliability: major maintenance was needed every 200,000-300,000 cycles, vent grooves clogged often, and hot-runner leakage affected delivery schedules.

The customer said very clearly: "We don't want the cheapest mold. We want a mold that really makes money."

So I recommended one of H T Mould's mature thin-wall PP food-packaging solutions: a 4-cavity refrigerated sealed container mold running on a 400T press with a 35-second cycle.

2. Solution Core: A Mold Built for Mass Production

This is not cavity stacking only—it is optimized from mold flow and field tuning to be a production asset.

1. Process data (actual production)

2. Why this package works

• 4 balanced cavities—fill balance from analysis, minimal pressure loss, no “one full, one short.”
• 35 s cycle—aggressive for thin-wall PP sealed boxes; typical tools need 42–45 s. We gained time via cooling and ejection design.
• 400T—fits many mid-size shops without new large presses.

3. Thin-wall PP–specific design

• Gating: hot runner + valve gate—less cold runner scrap, ~8% material saved per shot.
• Venting: denser vent lands; clean every ~100k shots without chronic blockage.
• Cooling: conformal circuits—stable mold temperature; warpage within ~0.15 mm.

3. Field data: ~9,874 pcs/day, yield over 99%

Three months of customer production logs:

• Daily output: ~9,874 pcs/24 h (3600 s / 35 s × 4 cavities × 24 h)
• Yield: over 99%; steady defect rate under 0.8%

Customer quote: “This mold almost runs night shift unattended—we only need one patrol. Very easy.”

4. Where costs drop

We model full life-cycle cost—not just mold price.

• Power: ~320 kWh saved per 10k pcs—$37.04 per 10k at typical tariff
• Labor: six headcount-equivalents saved—$5,208.83/month
• Maintenance: ~$5,787.59 saved per million shots
• Material: ~18 kg/day resin saved—$625.06/month

5. Profit example

6. 3M shots is the floor; 5–6M is typical

We warrant 3 million shots of normal use. This customer is past 4.1M and still stable.

At 5M shots amortized, mold cost per part is only $0.0032.

7. Customer voice

8. Who fits this mold?

If two or more apply, this tool is a strong match:

• Daily need 8,000–12,000 pcs
• Current cycle over 42 s
• Want one 400T to replace two slower lines
• High yield requirement (e-commerce / retail returns are costly)
• You value mold life and serviceability

Closing

As sales at H T Mould, I don’t push the most expensive tool—I push the highest earnings per machine-hour.

Faster cycle × more cavities × fewer breakdowns = lower piece cost = higher margin

Contact us for complimentary mold-flow review and ROI modeling.

H T Mould—production solutions that pay back, not just steel.