Capsule Filling Machine Changeover: 5 Key Parts to Adjust

Capsule Filling Machine Changeover is a routine operation for pharmaceutical manufacturers of multiple capsule sizes. A well-designed changeover system can make this process significantly easier. Instead of spending excessive time on complicated disassembly and adjustment, operators can focus on a limited number of key components and complete the changeover efficiently.

This article explains five key parts involved in capsule size changeover, common challenges during traditional changeovers, and how our machine is designed to make the process faster and more precise.

1. Capsule Filling Machine Compatibility: One Machine for Multiple Capsule Sizes

In capsule production, different products may require different capsule sizes based on their formulation, powder density, and filling volume. For manufacturers handling diverse products, the ability to produce multiple capsule specifications on the same machine can provide greater production flexibility. This part is to explore general capsule sizes handled by capsule filling machine and its benefits for manufactures.

1.1 Compatible Capsule Sizes

Capsules are available in different standard sizes to accommodate different formulations, dosage requirements, and filling volumes. For hard capsules, common sizes range from 000# to 5#, with 000# being the largest and 5# being the smallest in the standard size range.

Different Capsule Sizes

A capsule filling machine with a wide size range can be configured to handle multiple capsule specifications, from 000# to 5#, by changing the corresponding parts and making necessary adjustments. Components that directly position, separate, fill, and discharge the capsules must be matched to the selected capsule size.

1.2 Benefits of Multi-Size Compatibility

The ability to produce multiple capsule sizes on one capsule filling machine provides manufacturers with greater production flexibility.

Produce multiple products on one machine.

Different pharmaceutical, nutraceutical, and healthcare products may require different capsule sizes depending on dosage, formulation, and product requirements. A multi-size capsule filler allows manufacturers, especially CDMO (contract development and manufacturing organization), to handle different products using one capsule filler.

Reduce equipment investment.

Capsule filling machine capable of handling multiple sizes can reduce the need for additional production equipment. It can also help manufacturers make better use of limited production-floor space.

Improve production flexibility.

Manufacturers producing multiple products or different batch sizes can switch between capsule specifications according to their production schedule.

However, compatibility with multiple capsule sizes is only one part of the equation. The efficiency of the changeover process is equally important. If changing capsule sizes requires complicated procedures and long downtime, some of the flexibility gained from compatibility of capsule filler may be lost.

2. A Glance at Capsule Filling Machine Changeover

Although one capsule filling machine can handle multiple capsule sizes, it cannot simply be switched by changing a setting on the control panel. The mechanical components involved need to be matched to the new capsule specification.

This part is to introduce five key parts to be replaced during capsule filler changeover, and explain where the main challenges of traditional changeover come from and why an easy-changeover design matters for production efficiency.

2.1 Five Key Parts to Adjust

When changing from one capsule size to another, capsule filler needs to be adjusted at five key parts: capsule feeding station, upper and lower molds, dosing disc and powder scraper, filling rods and capsule discharge station.

The capsule feeding station is responsible for guiding and handling empty capsules into upper and lower molds. Different capsules have different diameters and lengths. Capsule sowing comb, turning board, and retainer therefore need to match the dimensions of the selected product.

Capsule feeding station

The upper and lower molds are responsible for holding the capsule bodies and caps respectively during the separation, powder filling and locking processes. Since different capsule sizes have different external dimensions, the mold cavities must correspond to the capsule specification. Molds should be changed to make capsules properly positioned during operation.

Part of capsule filling machine molds

The dosing disc is one of the most important components affecting powder filling weight. During operation, powder is accumulated and compressed in the dosing disc to form the required powder plug before it is transferred into the capsule body. Because different capsules have different internal volumes, the dosing disc needs to be matched to the target specification. The powder scraper works together with the dosing system to control and maintain the powder layer on the dosing disc. Its position also needs to be correctly adjusted to ensure stable dosing.

Dosing disc

The filling rods compress the powder within the dosing disc and help form the powder plug that is subsequently transferred into the capsule body. Different capsule sizes require corresponding filling components to ensure that the powder plugs are properly formed and transferred. Therefore, the filling rods need to be changed during capsule filler changeover.

After filling and capsule locking, finished products are discharged from the capsule filling machine. The discharge mechanism needs to accommodate the dimensions of the finished capsule. Its position therefore needs to be adjusted according to the capsule size to ensure smooth discharge.

Discharge station

2.2 Common Problems with Traditional Capsule Filling Machine Changeover

Although changing capsule sizes is a standard operation, poorly designed changeover procedures of capsule filling machine can create considerable inconvenience for operators. Here are some common problems with traditional capsule filling machine changeover.

Long changeover time

Multiple format parts need to be removed, replaced, and adjusted. If every step requires complicated disassembly, the machine may remain idle for an extended period. Long downtime could significantly affect production capacity and stability.

Difficult alignment

After replacing components, their positions need to be accurately aligned. If alignment is time-consuming or relies heavily on operator experience, the changeover process becomes less efficient. What’s more, misalignment can cause inaccurate filling weight and even machine shutdown.

Repeated adjustment

Even after installing the correct format parts, operators may need to fine-tune their positions. Without convenient adjustment mechanisms, this can make the changeover process of capsule filling machine unnecessarily complicated.

These issues are particularly noticeable for manufacturers producing multiple products or frequently switching between capsule specifications.

2.3 Why Faster Changeover Matters

For manufacturers with frequent product changes, changeover time is directly related to production efficiency.

A shorter and more convenient changeover process can:

• Reduce machine downtime
• Increase equipment utilization
• Simplify operator work
• Make multi-product manufacturing more practical

Therefore, when evaluating a capsule filling machine, manufacturers should consider not only product compatibility, but also how easily the machine can change between them.

3. How Do We Achieve Easy Changeover

Our capsule filling machine features modular design, making the key changeover parts quick and easy to replace. The operations are straightforward, reducing both changeover time and operational complexity. This allows manufacturers, especially CDMO, to switch between different products more efficiently, minimizing downtime and enabling faster production changeovers.

3.1 Capsule Feeding Station

To switch capsule feeding station during changeover of our capsule filling machine, first you only need loosen the fixing screws and orderly remove the capsule sowing comb, capsule retainer and turning board. Then install the corresponding capsule retainer, turning board and capsule sowing comb for the new capsule size in sequence.

After installation, the key issue is not simply whether the components are securely fixed, but whether they are accurately aligned with each other and the molds. Therefore testing rods are provided for right positioning between capsule retainer and upper and lower molds below it. This reduces reliance on visual judgment and makes the positioning process more repeatable and operator-friendly.

3.2 Upper and Lower Mold

The upper and lower molds are another critical group of components that must be changed when switching products. During capsule filler changeover, remove the existing upper and lower molds and install the mold set corresponding to the new capsule size.

Firstly install lower molds with screws, and then upper molds. In the whole process, alignment is of the ultimate importance. If the molds are not correctly aligned, the capsule may not be positioned properly during operation, which can affect capsule feeding and locking, and increase the risk of filling inaccuracy as well as mechanical interference.

Our machine provides high precision testing rods to assist mold alignment. During installation, two testing rods are placed each side of upper and lower molds. Then, rotate the rods while adjusting the position of the upper mold. The operator can judge the alignment by checking the tightness and resistance when turning the testing rods. If the upper mold is not correctly positioned, the rods may be difficult to turn or experience excessive resistance.

Continue fine-tuning the upper mold position until the calibration rods can move up and down smoothly without being stuck or excessively tight. Once the alignment is confirmed, tighten the fixing screws to secure the upper mold in the correct position.

This calibration method provides a clear physical reference for mold alignment, making the adjustment more accurate and easier for operators to perform. This turns what could otherwise be a time-consuming trial-and-error adjustment into a more controlled positioning process.

Install upper and lower molds with testing rods

3.3 Dosing Disc and Powder Scraper

During changeover of capsule filling machine, dosing disc and powder scraper of filling station should be replaced, which involves calibration adjustment after replacement.

To simplify this process and reduce material leakage, filling station of our capsule filler is equipped with a multi-dimensional adjustment mechanism, allowing the dosing disc to be adjusted in multiple directions. Also, with feeler gauge, the gap between dosing disc and copper plate can be precisely adjusted.

The powder scraper is also changed or adjusted accordingly to ensure that the powder is properly distributed and leveled across the dosing area.

What’s more, since the dosing disc directly influences the powder filling volume, different production requirements may call for different dosing configurations. Therefore, we provide dosing discs in not only different sizes, but also different thicknesses.

This gives customers greater flexibility when configuring the machine for different capsules and powder filling requirements, rather than limiting the changeover to capsule-size matching alone.

3.4 Filling Rod

Filling rod replacement is another important step in capsule size changeover. In traditional capsule filling machines, filling rods are often removed and replaced one by one. When a complete set of filling rods needs to be changed, this process can be time-consuming. In addition, the height of each filling rod needs to be adjusted accurately, making it difficult to achieve consistent positioning and increasing the operator’s workload.

To make this process faster and easier, our machine uses pull-out slot filling rod holder. Instead of replacing the filling rods individually, the holder can securely clamp a complete set of filling rods, allowing the entire set to be removed and replaced as one unit. This significantly simplifies the changeover process and reduces the time required for filling rod replacement.

The filling station is also equipped with clear calibrations, providing a direct reference for height adjustment of filling rods.

By combining the set-based filling rod replacement design with clear height graduations, our machine makes both replacement and height adjustment faster, easier, and more precise, helping maintain consistent filling weight during production.

Pull-out slot filling rod holder

3.5 Capsule Discharge Station

The final part to replace is the capsule discharge station. After filling and capsule closing, the finished capsules need to be transferred out of the machine smoothly. Since different capsule specifications have different dimensions, the discharge mechanism needs to be positioned accordingly.

Simply adjusting the corresponding screws to switch discharge mechanism for the new capsule specification is enough. Also, it is important to check whether the discharge port in alignment with the capsule ejection pin.

4. Conclusion

For manufacturers producing capsules in multiple specifications, especially contract manufacturers, a capsule filling machine with multi-size compatibility is highly important. Being able to handle different capsule sizes on a single machine gives manufacturers greater flexibility to meet diverse production requirements and customer orders.

However, compatibility is only the starting point. For capsule fillers that frequently switch between capsule sizes, the time required for changeover and the difficulty of operation can have an even greater impact on production. A complicated changeover means longer machine downtime, while repeated and time-consuming adjustments can reduce overall production efficiency and affect production sustainability.

With these customer pain points in mind, Rich Packing designed capsule filling machine with a modular and changeover-oriented structure to make replacement and adjustment of five major changeover parts faster, simpler, and more precise.

Our machine helps customers shorten changeover time, reduce operational difficulty, and get back to production faster. This provides a practical foundation for stable and continuous production, especially for manufacturers handling multiple capsule specifications.

Quick changeover of Rich Packing’s capsule filling machine

5. FAQs