Case Study: 56 ml IML Yogurt Cup Mold

92,000 pieces per day: how one mold helped the customer earn far more in a single year

H T Mould | Senior Sales Engineer

1. Project Background: Customers Never Need "Just a Mold"

In early 2023, a well-known dairy packaging supplier in North China approached us. The customer's original production line used a 1-out-4-cavity ordinary hot runner mold to produce 56ml yogurt cups, with a daily output of about 35,000 pieces. The injection molding cycle was about 13 seconds, and manual labeling was required for the second time. As orders from yogurt brands double, customers face two pain points:

• Capacity bottleneck: three shifts are required during the peak season, supply is still frequently interrupted, and high-priced spot goods are forced to be purchased from outside;
• The cost of a single piece remains high: electricity bills, labor, space, and equipment occupancy costs are all rising, and profit margins have been compressed to less than 8%.

The customer clearly stated a requirement: to more than double the daily production capacity without increasing the number of injection molding machines, and at the same time reduce the overall cost per thousand cups.

This was a typical thin-wall, in-mold labeling, high-output application. We recommended H T Mould's proven 56 ml thin-wall IML mold with 8 cavities, a 3-million-shot design target, and a cycle-time goal of under 8 seconds.

2. Technical Solution: Not Just More Cavities, but a Better System

1. Cycle time: 7.5 seconds, faster than target

After actual debugging, the stable mass production cycle is 7.5 seconds (the mold flow analysis provided by the customer also verified the feasibility). Let’s calculate the theoretical daily production capacity:

• 8 cavities, 7.5-second cycle time
• Theoretical modules per hour = 3600 ÷ 7.5 = 480 modules
• Production per hour = 480 × 8 = 3840 pieces
• Theoretical output 24 hours a day = 3840 × 24 = 92,160 pieces

Actual customer feedback: The output is stable at more than 92,000 pieces per day, and the overall equipment efficiency (OEE) is close to 96%.

Core advantages:

• Special hot runner system for thin-walled PP: fast filling, small pressure loss, and excellent fluidity at a melt temperature of 310°C;
• Efficient cooling waterway design: mold size 520×900×395mm, cooling water temperature 18-22℃, pressure 0.5-0.6MPa, temperature difference between cup body and cup bottom controlled within ±3℃, no deformation during demoulding;
• In-mold labeling and mold opening are synchronized: the robot's label picking, label placing, and product taking actions overlap with the mold opening and closing actions, without additional cycle time.

2. Mold life: not only 3 million shots, but at least 5 million in practice

We promise that the main structure will not be overhauled within 3 million molds, but in fact, at the customer site, according to the maintenance rhythm of cleaning the exhaust slot every 100,000 molds and checking the hot nozzle/spring/air ejector/wear block every 1 million molds, the first set of molds has reached 5.6 million molds and is still in stable production.

What does this mean for customers?
The price of one set of molds lasts nearly the life of two sets. The amortized cost of molds is directly cut in half.

3. Yield rate: above 99%, not a slogan, but a daily report

The production report sent by the customer every week shows:

• The average yield rate for three consecutive months is 99.2% ~ 99.5%
• The main defects are occasional labeling deviation or gate drawing (accounting for less than 0.5%)
• The scrap rate caused by molds has been lower than 0.3% for a long time

The high yield directly reduces the material and processing costs of each qualified product.

3. Cost Analysis: Why Customers Say the Mold "Pays for Another Mold in a Year"

We compare the customer's original 1-out-of-4 molds (cycle time: 13 seconds) with H T Mould's 1-out-of-8 molds (cycle time: 7.5 seconds), based on the calculation of 92,000 qualified products per day and 300 days of annual production.

1. Mold amortization cost (conservatively calculated based on a life of 3 million molds)

Calculated based on the actual life of 5 million molds: amortization per thousand molds is only $0.66, saving $9,694.21 a year in mold amortization alone.

2. Injection molding machine and energy cost

The old mold would require 2.63 units of 400T press capacity, while the H T Mould mold requires only one machine.
That saves about $305.58 in electricity per day, or roughly $91,154.49 per year.

3. Labor costs

The old setup required 9 people, while the new setup needs only 3.
That means 6 fewer positions and annual labor savings of about $78,132.42.

4. Labeling costs

In-mold labeling saves $0.0004 per piece compared to secondary labeling. Annual savings of about $11,980.3.

4. Comprehensive benefits: How much more money did the customer make after one year?

A set of molds costing USD 180,000 helped the customer save a net USD 1.32 million in the first year!

5. Daily Maintenance: Straightforward, but Important

• Daily: Lubricant filling (guide rail, ejection plate, slider), completed in 5 minutes;
• Every 100,000 molds (about 10-12 days): Clean the exhaust slot to prevent trapped air from burning, which takes about 30 minutes;
• Every 1 million molds (about 3 to 4 months): Comprehensively inspect the hot nozzle, spring, gas ejector pin, and wear-resistant block, replace them according to wear and tear, and shut down the machine for half a day;
• Every 3 million molds: It is recommended to replace the spring and some gas ejector seals, which costs about 2,000 to $434.07.

Customer feedback: An ordinary mold fitter can do the job, no outsourcing is required.

6. Why H T Mould? Three Core Strengths

• Hot-runner balancing: 8 cavities fill in the same 7.5-second cycle with weight deviation of no more than 0.5%;
• Cooling efficiency optimization: Mold flow analysis + actual measuring point temperature, cup roundness ≤ 0.1mm, stable stacking;
• In-mold labeling positioning accuracy: The label position deviation is ≤0.3mm, and the defective rate is extremely low.

We do not rely on gimmicks. We focus on the fundamentals: every cooling channel, every ejector component, and every temperature setting is engineered carefully.

7. A Practical Message for Prospective Customers

If you are producing 56ml yogurt cups, jelly cups, and pudding cups, and currently you are still producing 4 out of 1 or 6 out of 1 with a cycle of more than 10 seconds, you still have at least 30% to 50% of your production capacity locked in the old mold.

Upgrading to an H T Mould 8-cavity thin-wall IML mold typically requires an investment of USD 180,000 to 220,000. In many cases, that investment can be recovered within 3 to 6 months through savings in electricity, labor, and processing cost.

We can even provide trial mold verification services: you send the raw materials and labels, we run a 400T machine in the H T Mould factory for a day and give you a call on the spot - 7.5 second cycle, 99% yield, 92,000 pieces per day, the data speaks for itself.

Conclusion

Packaging has long been a business of fine margins. Saving just $0.0007 per cup can mean well over $100,000 in annual profit. This 56 ml yogurt cup mold is not a showpiece; it is a production tool refined through repeated real-world use, with one goal: to help customers make more good parts with fewer machines, fewer people, and less time.

92,000 pieces per day, a cycle of 7.5 seconds, starting with 3 million cycles.

If you want to know more cases or obtain a mold replacement investment return analysis for your existing production line, please contact the H T Mould Sales Team.

Let every mold generate profit.

Attachment: The data in this article comes from the statistics of actual customer cases of H T Mould. Due to differences in on-site working conditions, the specific results are subject to actual mold trials.