How to Solve High-Viscosity Challenges in Curcumin Liquid Capsule Filling: A Case Study from Canada

1.How Do We Keep Curcumin Liquid from Solidifying During Capsule Filling?

Curcumin turns solid at room temperature. Your pipes will block, and the capsule liquid filling machine will stop running. I fix this with a complete heating system and a very strong pump.

We keep curcumin liquid flowing by using a stainless steel holding tank with a heating function. We wrap all liquid pipes with insulation and heaters. We also use a stainless steel plunger pump instead of a normal peristaltic pump to handle the thick liquid.

Heated tank and plunger pump for viscous liquid

During the initial engineering consultation for the Canadian project, fluid mobility under ambient production environments was identified as a critical risk factor.

Customer's curcumin liquid and capsule samples

Curcumin extract exhibits highly non-Newtonian, thixotropic behavior, transitioning into a semi-solid crystalline state when chemical temperature drops below specific thresholds. To mitigate this viscosity barrier, our team deployed automated thermal profiling data to demonstrate advanced fluid containment handling.

Breaking Down the Viscosity Problem

To understand why normal machines fail, we must look at the pump. Normal machines use peristaltic pumps. These pumps squeeze a soft plastic tube to move liquid. They are too weak for thick curcumin.

The tube will break or the liquid will not move. We use a stainless steel plunger pump instead. This pump acts like a strong metal syringe. It pushes the thick liquid with high pressure. It will not break.

Temperature Control System

Temperature is the most important factor for curcumin. If the liquid gets cold anywhere in the machine, it will block the pipes. We built a complete automatic temperature control system. This system manages the heat from the start to the end.

By using this design, the liquid stays warm all the time. It flows easily into the capsules without stopping. This keeps the production fast and safe.

2.How Can We Prove the Machine Works for 18,000 Capsules Per Hour?

Buyers worry if a machine can really meet their speed needs. Guessing is too risky and costs money. I prove it by running a real test with their exact liquid formula.

To prove the machine works at 18,000 capsules per hour, we do a real test. We bought raw curcumin material in China. We mixed the liquid using the client's exact ratio. Then, we ran the filling machine with size 00 capsules to show the real results.

Testing curcumin liquid capsule filling

The client liked our heating design very much. They asked me for a price. They wanted to use size 00 capsules. They needed a high speed of 18,000 capsules every hour.

Even after I gave them the price, they still felt nervous.They worried the temperature control might fail during such a high-speed filling process. They did not want to lose money on a bad machine.

The Real Material Test

Thick liquid exactly like customers

To verify machine operational stability prior to factory acceptance testing (FAT), a rigorous material simulation was executed within our domestic testing center.

Utilizing raw curcumin substrates formulated precisely to the client’s proprietary blending ratios, we engineered a high-viscosity testing medium that perfectly mirrored the thermal and mechanical characteristics of the target production stream.

Checking the Results

Sample after machine trial run

We put this test liquid into our heated tank. We turned on the heaters. We started the machine at full speed. The plunger pump pushed the hot liquid into the size 00 capsules perfectly. The speed reached 18,000 capsules per hour. We recorded a long video of the whole process.

I sent the video to the client. I also sent the finished capsule samples to Canada. Seeing the real machine run with their actual product took away all their fears. They knew the machine would work in their factory.

3.Why Is Our Double Roller Sealing Better for Curcumin Capsules?

Leaking capsules ruin your product and make a big mess. Bad sealing machines cause this problem. I use a double rubber roller system to seal capsules perfectly every single time.

Our double rubber roller system with convex and concave grooves applies glue evenly. This creates a much better seal than single roller machines. We also use a servo motor to move the glue box and an automatic glue storage tank to feed the liquid.

Double roller capsule sealing machine

Following successful volumetric liquid dosing validation, the engineering focus shifted to primary container closure integrity (CCIT). High-viscosity active components can cause capillary leakage if the capsule joint seal is compromised, leading to batch contamination and compromised shelf-life. Our automated sealing architecture addresses this via a distinct mechanical paradigm detailed below.

The Double Roller Advantage

Most other companies use a single rubber roller to apply glue to the capsule. This single roller does not spread the glue evenly. We use two rubber rollers.

Double roller vs single roller

These rollers have special convex and concave grooves. They wrap the glue around the capsule joint perfectly. This makes the seal very strong and even.

Smart Glue Control and Cooling

We also changed how the machine moves and how it feeds glue. Other machines use cheap air cylinders to move the glue box up and down. This is not smooth.

AIPAK’s glue control design

We use a precise servo motor. Other machines require you to add glue by hand. This is messy and slow. We put an auto-feed glue storage tank inside the machine. It pumps glue automatically.

AIPAK’s vertical cooling system vs others horizontal cooler

Finally, we use a vertical natural air cooling system. Other companies use a horizontal air conditioner cooler. Our vertical design saves factory space and cools the capsules better. These designs completely solved all the client's worries.

Conclusion

We solved the client's curcumin filling problem by using heated tanks, plunger pumps, and a double roller sealing system. These simple designs make thick liquid capsule filling easy and safe.