Versatile Eye Drop Filling Machine: How a Custom Monoblock Handles 5ml Vials and 100ml Reagent Bottles?

1.Why Do Suppliers Say You Cannot Mix Small Vials and Large Bottles?

Do bottle jams ruin your production run? Most standard machines fail when bottle sizes change too much. This causes downtime, lost money, and endless frustration for your operators.

Most suppliers avoid mixing extreme bottle sizes because it requires frequent mold changes and high operator skill. Linear machines often jam when handling both tiny 5ml vials with inner plugs and large 100ml bottles with only outer caps.

Pharmaceutical bottle size comparison

When you talk to most equipment suppliers, they will tell you to buy two separate machines. I hear this all the time. The reason is simple. A 5ml eye drop bottle is tiny. It needs an inner plug and an outer cap.A 100ml diagnostic reagent bottle is much larger. It only needs an outer cap.

5ml eye drop bottle with inner plug and outer cap

100ml bottle with only outer cap

If you put both on a standard linear filling line, the machine will likely jam. The bottle sizes and cap sizes are completely different. The filling volume gap is also huge. Standard machines are just not built for this kind of extreme change.

They require your operators to have very high skills. Your team would need to change molds all the time. This takes hours of hard work. Other suppliers want to take the easy way out. They tell you to spend more money on more machines.

But I know this is not always the best choice for a business. We like to look deeper into the problem. We know that forcing different bottles into a basic machine causes trouble. But with the right custom design, we can avoid these jams completely.

2.How Does One Cleanroom Fit Multiple Filling Demands?

Is your cleanroom too small for multiple production lines? Expanding your factory costs too much money and time. You need a way to do more in a small space.

A client from Egypt faced limited cleanroom space for a new product line. Buying two separate eye drop filling machines meant high initial investment and double the labor costs. A single, versatile machine was the only way to fit their budget and space limits.

Cleanroom pharmaceutical packaging machine

An Egyptian client sent me a message on WhatsApp recently. He needed a filling line for a new project. His smallest product was a 5ml eye drop. His largest product was a 100ml diagnostic reagent.

There were two other bottle sizes in between. He told me his biggest problem. His cleanroom space was very limited. This was a brand new product line for his company.

If he bought two separate eye drop filling machines, the initial equipment investment would be huge.Later, the labor costs to run two lines would also be too high.

He needed to run all four bottle sizes on one single machine. He had spoken to many other suppliers before me. They all warned him that combining these products would cause frequent bottle jams.They strongly suggested he buy two machines.

His worry was very real and correct. However, I told him we had experience with this exact situation.

I sent him videos of similar projects we did in the past. I promised him our technical team would provide a custom plan. By understanding his space and budget limits, we knew we had to design something special. We could not just give him a standard eye drop filling machine.

3.What Makes the Rotary Monoblock Machine the Best Solution?

Are linear filling lines causing you trouble with different caps? Dropped caps and slow speeds kill your daily output. You need a smarter, more stable way to pack.

We used a rotary filling, plugging, and capping monoblock machine instead of a linear one. For eye drops, a robot arm places the inner plug. For larger bottles, a touch screen command lifts the plugging station so bottles pass directly to capping.

Rotary monoblock filling capping machine

After we held a video meeting with the client, I explained exactly how we would solve his problem. We quoted him a rotary monoblock machine. This is an all-in-one filling, plugging, and capping unit.

We did not use a linear separated machine. Rotary machines are much better for handling different bottles smoothly without jamming. The most clever part of our design is the inner plug station.

Inner plug station

When the machine runs the 5ml eye drops, a mechanical arm picks up and places the inner plug normally. But what happens when you switch to the 100ml reagent bottle that has no inner plug?

You simply press one button on the touch screen. The entire plugging mechanism automatically pauses and lifts up. The large bottles just pass right under it. They go straight into the final capping stage.

Extra cap vibrator bowl

It is that simple. You do not need tools to remove the plugging station. Because the cap sizes were also very different, we added an extra cap vibrator bowl. This custom design means the operator does very little physical work. The machine's brain does the heavy lifting.

4.How Do We Ensure High Speed and Precision for Different Volumes?

Is your machine too slow when filling large bottles? Poor filling accuracy wastes your expensive liquid product. You need a system that is fast and exact every time.

We used a 4-head servo piston pump to ensure high speed and precision. The machine fills four bottles at once, easily reaching 60 bottles per minute for 100ml. For volumes under 30ml, we provided extra filling needles to keep the accuracy perfect.

head servo piston pump

The client had a strict speed rule. The machine had to reach 50 to 60 bottles per minute, even at the maximum 100ml volume. A standard single-head filler would be far too slow for this.

To meet this need, we installed a 4-head servo piston pump. This means four nozzles dispense liquid at the same exact time. This easily hits the 60 bottles per minute target for the big 100ml bottles.

Pumps controlled by servo motors

Servo motors control the pumps. This gives very high accuracy. You will not waste your expensive liquid products. However, filling 5ml and filling 100ml require different tools to stay accurate. A big nozzle will splash liquid out of a tiny 5ml bottle.

Extra filling needles

To fix this, we gave the client extra filling needles for any volume under 30ml. The operator just swaps the needles when changing bottle sizes.

This setup guarantees that every bottle gets the exact right amount of liquid. The client was very happy to see that one machine could handle all his needs perfectly.

Conclusion

A custom rotary monoblock machine easily runs both 5ml vials and 100ml bottles. It saves space, lowers costs, and gives you fast, precise filling for all your products. Struggling with diverse bottle sizes and limited cleanroom space? Don't let standard equipment hold back your production. Click here to consult AIPAK’s engineering team for a Free Eye Drop Filling Machine Compatibility Audit and a customized 3D layout today!