In our previous articles, we mentioned some automated coffee capsule filling and sealing equipment, which makes coffee capsule production efficient and stable. However, even so, we still encounter various problems, large and small, in actual production. Today, let's look at common production problems and their corresponding solutions to make the production process smoother.
1. Inconsistent Filling Weight
Inconsistent weight is one of the most common problems, usually manifesting as underfilling or overfilling of capsules. There are many possible causes for this problem, such as uneven coffee powder density, incorrect auger settings, poor grinder grinding, clumping of coffee powder in the hopper, or wear and tear on the filling components.
So how do we deal with this? Several aspects need to be monitored regularly.
- 01. Regularly calibrate the filling system.
- 02. Use a consistent grind size.
- 03. Ensure consistent moisture and density of coffee beans.
- 04. Regularly clean the screw conveyor and hopper to prevent coffee powder from clumping.
- 05. Use a checkweigher to verify filling accuracy.
2. Poor Sealing Quality
Sealing problems are common and critical. Poor sealing can lead to product spoilage and customer complaints. Common causes of poor sealing include incorrect bee temperature, inappropriate sealing pressure, damaged sealing heads, inferior caps, and mismatched capsule sizes.
When these problems occur, we can address them as follows:
- 01. Have engineers optimize temperature, pressure, and sealing time to find the most suitable solution.
- 02. Regularly inspect sealing tools.
- 03. Purchase high-quality capsules and caps of the correct size whenever possible.
- 04. Regularly inspect and replace worn sealing components.
3. Coffee Powder on the Sealing Surface
Coffee powder leakage is also a common problem. The most direct consequence is that it affects the sealing effect, leading to a series of subsequent problems. Why does this happen? The most common cause is overfilling, but it could also be due to static electricity or powder splattering during the filling process.
To address this issue, please note the following:
- 01. Adjust the filling nozzle position to optimize the filling height.
- 02. Strengthen dust removal before sealing to keep the sealing area clean.
4. Capsule Feeding Problems
This is also a common problem, often manifesting as double feeding, missing capsules, inverted capsules, or capsules stuck in the tracks. This is most likely caused by substandard capsule quality, incorrect guide adjustment, damaged feeding components, or dust accumulation.
To avoid this, perform the following checks regularly:
- 01. Check capsule dimensions before production.
- 02. Clean feeding tracks regularly.
- 03. Adjust the guide according to the specific capsule format.
- 04. Regularly check and replace feeding components promptly.
5. Oxygen Levels Are Too High
This is usually caused by leaking seals, insufficient nitrogen rinsing, low nitrogen purity, or a slowdown in production speed after grinding. To address these issues, the following points should be noted:
- 01. Regularly check sealing performance
- 02. Regularly check nitrogen purity and flow rate
- 03. Regularly test residual oxygen content
- 04. Minimize the time interval between grinding and filling.
This issue has been mentioned in our previous articles. Complex modules being replaced or inadequate operator skills can significantly increase downtime.
Therefore, to avoid this problem, it is crucial to:
- 01. Use standardized modular tools whenever possible.
- 02. Organize replacement parts systematically, ideally labeling each part for easy reference.
- 03. Minimize frequent changes.
- 04. Conduct regular operator training or have experienced personnel perform the changes.
7. Coffee Dust Around the Machine
This is not merely a cleaning issue; it can severely impact machine filling accuracy, sensor performance, and other aspects. Therefore, the following arrangements are essential:
- 01. Install effective dust removal devices in suitable locations.
- 02. Clean sensors regularly.
- 03. Perform routine cleaning after production.
- 04. Regularly inspect moving parts for dust accumulation.
8. Inconsistent Capsule Appearance
Often, produced capsules exhibit unsatisfactory conditions, such as scratches, dented flanges, uneven sealing, or misaligned caps. There are many possible causes, including capsule defects or worn tools. To ensure customers receive perfect capsules, pay attention to the following:
- 01. Minimize unnecessary capsule contact.
- 02. Regularly replace worn guide rails.
- 03. Adjust the transmission mechanism as needed.
- 04. Check capsule quality before filling.
Final Thoughts:
It's not difficult to see that most problems are not caused by a single factor, but many can be prevented. Therefore, regular inspection and maintenance can prevent many subsequent problems.
EXPAK specializes in the coffee capsule filling and sealing industry. From precise filling to reliable sealing, and flexible multi-channel machines, we are committed to enabling our clients to achieve stable and efficient production, maintaining long-term productivity. Contact us if you have any questions!
Publication Date: 8/13/2026
Category: Product Events
