For fast-growing consumer and cosmetics brands, manual manufacturing processes often work well early on. As volumes increase and quality tolerances tighten, however, the limitations of hand assembly become harder to ignore. At that point, automation is no longer about speed alone. It becomes essential for protecting product quality, improving consistency, and enabling sustainable scale.
This issue became real for one growing cosmetics manufacturer when their hand-filled, hand-sealed capsule process reached its practical ceiling. Production demand was increasing, operator variability was becoming a concern, and further growth would have required adding labor without improving repeatability. To move forward, the company needed an automated solution that could deliver higher throughput, tighter precision, and long-term reliability within an existing facility footprint.
The client produced small HDPE cosmetic capsules used in a consumer aerosolizing device. Each capsule required an exact fill of 0.8 mL of liquid with a tolerance of ±0.01 mL, followed by a reliable foil seal to prevent leaks or dry-out during use. Meeting those requirements consistently was critical to product performance.
Before automation, operators filled capsules by hand using syringes, transferred them to secondary fixtures, heat-sealed oversized foil sheets, and trimmed excess material downstream. Even with multiple operators, throughput peaked at approximately 1,300 capsules per hour, and quality was highly dependent on individual technique. As demand increased, the process became difficult to scale without introducing variability and inefficiency.
The automation goal was clear: increase throughput, reduce reliance on manual labor, and improve consistency across filling and sealing operations, all while working within tight space constraints.
Three core challenges shaped the system design. First was capsule handling. Small, lightweight capsules needed to be delivered at rate, correctly oriented, and precisely positioned for downstream operations. Bulk feeding and orienting parts at high speed while maintaining positional accuracy required careful mechanical design.
Second was dispensing accuracy. Dispensing too little liquid would cause the aerosolizing device to dry out, while overfilling would result in leaks. Achieving repeatable dispensing within a ±0.01 mL tolerance across multiple cosmetic formulations required a fluid handling system designed for precision and long-term consistency.
The third challenge was sealing. The existing process relied on sealing oversized foil and trimming excess material afterward. Replicating that approach in automation would add complexity and risk, making it necessary to rethink the sealing process entirely.
During the system definition phase, Re:Build DAPR evaluated linear, 4-up rotary, and 3-up rotary configurations. After assessing throughput requirements, floor space limitations, and precision needs, a 3-up rotary dial system was selected. This architecture provided the required output while maintaining a compact footprint and predictable indexing for high-precision operations.
Early testing helped de-risk the design. Foil sealing trials established temperature and pressure requirements, while proof-of-concept testing validated positive displacement pump accuracy across all customer-provided liquids. Some formulations required continuous mixing to remain homogeneous, which was validated during system definition before being incorporated into the final design.
The final system integrated custom mechanical design, precision fluid handling, automated sealing, and in-line inspection into a single platform. Capsules are bulk-loaded into a hopper and fed into a vibratory bowl feeder, where mechanical features, compressed air, and vibration orient the parts. A custom singulation system then separates and spaces capsules before placing three at a time into a rotary dial nest using stop gates, air assists, vacuum grippers, and separating fingers.
Capsules are filled using positive displacement pumps capable of dispensing 0.8 mL with ±0.01 mL accuracy. A custom recirculating loop with a secondary pump and tank mixer maintains homogeneity for liquids prone to separation, while extensive priming and purge studies ensure clean changeovers between products.
Sealing was redesigned to eliminate unnecessary steps. Instead of sealing oversized foil and trimming afterward, the system die-cuts foil prior to sealing. A gantry-actuated heated sealing press applies the foil using a compliant base that accommodates capsule height variation. Thermal analysis ultimately drove a material change to a Teflon-coated copper sealing head to improve heat transfer while preventing plastic adhesion.
After sealing, capsules are inspected using a Cognex In-Sight 7800 vision system that checks foil concentricity and detects bubbles indicating incomplete seals. Defective capsules are automatically rejected before exiting the system.
During commissioning, material behavior introduced challenges that required refinement. The selected sealing foil required a higher activation temperature than the capsule plastic could tolerate, leading to “squatting,” where capsules softened before the foil activated. This caused deformation, inspection inconsistencies, and plastic buildup on the sealing head.
Through targeted testing, thermal analysis, and sealing head material changes, the process was stabilized. These refinements restored inspection accuracy, eliminated plastic buildup, and ensured reliable long-term operation.
The completed system exceeded its original performance targets. Designed for 1,950 capsules per hour, it consistently achieved sustained production rates above 2,000 capsules per hour. Operator involvement was reduced from three or four operators down to a single operator responsible for monitoring and maintaining the system.
Early inspection thresholds were set conservatively to prioritize seal integrity. As production data accumulated, the team identified opportunities to fine-tune the vision system to better distinguish acceptable capsules and further optimize yield. More importantly, the project represented the client’s first experience with industrial automation, helping establish realistic expectations and internal confidence in automated manufacturing.
This project demonstrates that effective automation is not simply about increasing speed. It requires understanding materials, tolerances, and real-world process behavior. By combining early system definition, rigorous testing, and integrated system design, Re:Build DAPR delivered an automation solution that enabled a growing cosmetics manufacturer to move beyond the limits of manual production and into a scalable, repeatable manufacturing environment.
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