Which Capsule Filler Handles Oily Liquids and Suspensions Best?
Pharmaceutical manufacturers working with oily formulations, suspensions, and sticky or hygroscopic materials face a persistent equipment challenge: standard powder-based capsule fillers are simply not designed to handle liquid or semi-liquid actives without leakage, inconsistent dosing, or contamination risk. For companies searching for a dedicated solution, Guangdong Rich Packing Machinery Co., Ltd., operating under the brand Guangdong Rich Packing, offers a purpose-built answer through its NJY-330C Automatic Capsule Liquid Filling and Sealing Machine Production Line.
Industry Challenge: Filling Oily and Sticky Formulations
Encapsulating oily liquids or suspensions introduces problems that do not exist in dry powder filling. Manufacturers commonly encounter difficulty filling oily liquids or suspensions accurately, leakage during transport after sealing, and complex cleaning requirements when residues from sticky materials build up inside the equipment. These issues are especially critical for potent medicines, hygroscopic materials, and sustained-release products, where dosing precision and sealing integrity directly affect drug safety and shelf stability.
Guangdong Rich Packing addressed this technological gap directly. According to the company's development history, it independently developed China's first hard capsule liquid filling and sealing production line, the NJY-330C, positioning it as a dedicated response to a gap that had previously existed in the domestic capsule packaging equipment sector.
Introducing the NJY-330C: A Dedicated Liquid Filling and Sealing Line
The NJY-330C is described by the company as China's first independent hard capsule liquid filling and sealing solution, built specifically around the demands of oily and suspension-based formulations rather than dry powders.
Ceramic Pump Technology for Sticky Substances
At the core of the system is ceramic pump technology, which uses a drawing mechanism engineered to handle sticky substances and prevent dripping. This addresses one of the most common failure points in liquid encapsulation—material clinging to dosing components and causing inconsistent fill volumes or post-fill drips.
Precision Injection and Zero-Leakage Sealing
Dosing accuracy on the NJY-330C is driven by a Japanese Yaskawa servo motor, which the company states delivers a liquid injection error of less than 2%. This is paired with a zero leakage sealing design, intended to enhance safety for clinical application by ensuring that sealed capsules do not release liquid content during handling or transport. A dual-sealing system, protected by national-level patented technology, is compatible with both gelatin and vegetable capsules, giving manufacturers flexibility depending on the capsule shell material specified for a given formulation.
The line also includes capsule cap detection, a real-time inspection feature that skips the filling step if a capsule has not been properly opened—preventing wasted liquid and reducing the risk of malformed units reaching later production stages. Customizable sealing liquids are available, tailored to different capsule materials, which supports formulations that require specific compatibility between the sealing agent and the capsule shell.
Efficient Drying and Contamination-Free Design
Once capsules are filled and sealed, moisture and surface residue must be managed before packaging. The NJY-330C integrates a vertical air-drying system, which the company reports achieves 63% higher drying efficiency compared to standard approaches referenced in its own specifications. A matrix-style discharge mechanism is built in to prevent jams and blockages during output, supporting continuous line operation without frequent manual intervention.
Maintenance is addressed through a one-touch PLC cleaning function, which simplifies the discharge of residual oil and streamlines routine maintenance—an important consideration given how difficult sticky or oily residues can be to clear manually in conventional equipment.
Flexible Configuration for Various Capsule Materials
For manufacturers who need to combine liquid dosing with solid components, the NJY-330C offers an optional pellet filling feature, allowing for combined liquid and pellet dosing within a single production run. This flexibility broadens the line's applicability beyond pure liquid formulations to more complex combination products.
Proven Results in Real-World Applications
In deployment, the NJY-330C has been reported to provide ±1% accuracy and zero leakage specifically for poorly soluble drugs—a category of formulation that is often the most difficult to encapsulate consistently. This liquid encapsulation performance data reflects the equipment's suitability for pharmaceutical products where solubility challenges have historically limited manufacturing options.
Complementary Solutions Within the Rich Packing Portfolio
While the NJY-330C is the company's dedicated answer to oily liquid and suspension filling, Guangdong Rich Packing's broader product matrix illustrates how the company approaches capsule filling as a category rather than a single product. The CGNT-209 Semi-auto Capsule Filling Machine targets medium-scale powder production and research settings, using a dual-row feeding system and pneumatic locking mechanism to reduce powder leakage and manual labor. The NJP-1500D Fully Automatic Capsule Filling Machine is built for high-volume powder encapsulation across traditional Chinese medicine, Western medicine, and health supplement production, featuring a patented turntable design, a 100DS indexing box, and a German Zeiss optical dividing head for dosing accuracy within ±3%.
This range means that a manufacturer's choice of equipment should be guided by formulation type: powders are best served by the CGNT-209 or NJP-1500D, while oily liquids, suspensions, and sticky or hygroscopic materials point clearly to the NJY-330C.
Global Component Standards and Compliance
Across its product line, Guangdong Rich Packing incorporates components from established international technology partners, including Siemens (Germany) for PLC and HMI systems, Schneider Electric (France) for electrical components, Omron (Japan) for relays, Yaskawa (Japan) for servo motors, Zeiss (Germany) for optical dividing heads, Becker (Germany) for vacuum pumps, SEW (Germany) for drive motors, NSK/IKO (Japan) for bearings, and SAMICK (Korea) for linear bearings. This component sourcing strategy underpins the mechatronic and pneumatic integration described across the company's technical capabilities.
On the compliance side, the company's equipment is built to meet GMP (Good Manufacturing Practice) standards and the JB20025-2004 industry standard, both relevant benchmarks for pharmaceutical packaging machinery. The NJY-330C's online printing modules for production dates and batch codes further support GMP data integrity requirements during manufacturing.
Choosing the Right Equipment Partner
For manufacturers specifically asking which capsule filler is suited for oily liquids and suspensions, the technical specifications and case data associated with the NJY-330C from Guangdong Rich Packing point to a system engineered around the particular difficulties of liquid encapsulation: sticky material handling through ceramic pump technology, sub-2% injection error via Yaskawa servo control, zero-leakage sealing, and drying efficiency gains through its vertical air-drying system. Combined with its standing as China's first independently developed hard capsule liquid filling and sealing production line, the NJY-330C represents a targeted, purpose-built response to a well-documented gap in pharmaceutical packaging equipment for liquid and suspension-based formulations.
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