| What are the key technical difficulties of the traditional Chinese medicine pill-making machine? |
|
| 2026-5-29 publish |
The technical difficulties of the traditional Chinese medicine pill-making machine essentially stem from the "fourfold contradiction of extremely unstable materials, strong coupling of processes, high speed and high precision, and strict GMP requirements". Domestic equipment still has significant bottlenecks in the four aspects of rheological control, precision molds, online detection, and intelligent collaboration. The following will elaborate on the core difficulties (as agreed upon by the industry in 2026).
1. The rheological properties of the soft material are unstable (the most fundamental and difficult to control)
Chinese herbal soft dosage forms (paste pills / honey pills / concentrated pills) are non-Newtonian, time-dependent, and viscoelastic materials. The formulations, moisture content, temperature, and batch variations are extremely large, which directly leads to:
Severe fluctuations in extrusion pressure
The medicinal materials vary in terms of oil content / sugar content / starch content. Therefore, the soft materials exhibit significant differences in "softness, stickiness, elasticity and brittleness".
The moisture content fluctuates by ±1%, the extrusion pressure can fluctuate by ±0.2–0.5 MPa, and the thickness of the pills varies unpredictably, with the pill weight suddenly shifting by (±8%–15%).
Extremely sensitive to temperature
Pharmaceutical processing / Friction generates heat during the extrusion process. The soft material will become softer, adhere to the mold, and collapse into strips when the temperature rises by **5–10℃**.
Large honey pills (with honey content of ≥ 30%) will easily melt and deform when the temperature exceeds 45℃; while at low temperatures, they will become hard and break apart.
Poor batch consistency
The differences in the origin, collection period and processing of Chinese medicinal materials lead to variations in the rheological properties of the same formulation soft material in each batch.
Traditional open-loop control can only "adjust parameters based on experience" and is unable to adapt automatically. The pass rate is often lower than 85%.
Technical bottleneck: Lack of real-time rheological online detection + adaptive feedforward control; The accuracy and stability of domestic sensors are insufficient, and they rely on imports (domesticization rate < 35%).
II. Bottleneck in the precision and stability of extrusion into strips (determining the core weight of the pills)
The diameter tolerance of the pill strip directly affects the pill weight (volume ∝ diameter²). The industry standard requires **±0.1mm**, but the actual difficulties are prominent:
The dual problems of mold wear and mold sticking
The soft material contains fibers and powders. Under high-speed extrusion (50–200 kg/h), the inner hole of the mold wears out rapidly. After 3 to 6 months, the diameter deviation exceeds 0.2 mm.
The honey pills / sugar-concentrated pills are prone to sticking to the mold, resulting in intermittent strips and rough surfaces, and even blocking the mold.
The closed-loop control of extrusion pressure is difficult to stabilize.
The screw rotation speed, back pressure, die head temperature, and soft material viscosity are strongly coupled. Adjusting any single variable is prone to causing oscillations.
When the production capacity is high (>150kg/h), the abnormal difference in pellet weight rises sharply from ±3% to ±8% - 12%, which is seriously beyond the standard.
The porosity of the mold is uneven.
The flow rates of each hole in the 12-24 hole mold head are uneven. The middle part has a faster flow rate while the edges have a slower flow rate. The lengths and thicknesses of the drug strips are also inconsistent.
Precise flow channel design and pressure equalization chamber are required. However, the processing accuracy of domestic products (±0.02mm) and the surface finish (Ra ≤ 0.4μm) are insufficient.
Technical bottleneck: The super-hard, wear-resistant, anti-sticking molds (titanium alloy ceramic composite / nano-coated) rely on imported formulations and sintering processes (constant temperature at 1450℃ ± 5℃ for 48 hours), and the domestic lifespan is only 60% of the imported ones.
III. Contradiction between the roundness of high-speed cutting and rolling and the damage rate
The process of cutting and rolling into a ball is completed in a single step: "Cutting → Rolling → Shaping". The higher the speed, the poorer the roundness and the higher the rate of damage.
It is difficult to precisely match the gap between the rubbing rollers with the rotational speed.
Diameter: Φ3 - 8mm. The clearance should be controlled within ±0.05mm; Speed difference: 10 - 30rpm. Minor deviations can result in oval shapes, flattened pills, or burrs.
High-speed impact deformation
When the production capacity is ≥ 100 kg/h, the line speed of the pellets reaches 1.5 - 2.5 m/s. They collide with each other, bounce, are prone to deformation, fall off, and have an uneven surface.
The large pills (soft and sticky) are more prone to sticking together and deforming. The damage rate needs to be controlled at **<1%**, which is extremely difficult.
Inflexible material with poor adaptability
Water丸 (crispy) is fragile, honey丸 (sticky) is prone to sticking, and concentrated丸 (hard) is easy to be ground. A single搓roller material (silicone / polyurethane) is difficult to be fully compatible.
Technical bottleneck: The complex structure of the six-roll precision rolling, flexible diversion, and buffer shaping system. The servo synchronization control accuracy (±0.01mm) and response speed (≤10ms) are insufficient. Most domestic products are three-roll, while high-end six-roll systems rely on imported core components.
IV. Shortcomings in Online Detection and Intelligent Control (Difference in Accuracy and Stability)
The online detection accuracy of the pill weight and pill diameter is insufficient.
Mainstream photoelectric / visual inspection, domestic accuracy: **±0.5% – ±1%, imported can reach ±0.1% – ±0.3%**;
At high speeds (> 200 particles per minute), the rate of missed detections and false detections is high, and there are significant interferences from dust, reflection, and adhesion.
The AI adaptive control algorithm is not yet mature.
It is necessary to collect real-time data on moisture content, temperature, pressure, pellet diameter and weight, and dynamically adjust the screw rotation speed, cutter frequency and搓辊 gap.
Domestic products mostly use simple PID, which has lag and is prone to oscillation; while imported ones employ MPC model prediction + fuzzy adaptive + reinforcement learning, achieving closed-loop within 10ms, and the weight variation rate RSD is stable at ≤1.5%.
Data Traceability and GMP Compliance Challenges
Electronic batch records are required, and the operation logs must not be tampered with. There should be a hierarchical system of permissions, in accordance with 21 CFR Part 11 and EU GMP Annex 11.
The domestic software lacks comprehensive functions and has poor compatibility, resulting in a low success rate of integration with MES/ERP systems.
Technical bottlenecks: High-speed vision sensors, edge computing units, and intelligent algorithm models are all imported, with the domesticization rate being less than 40%; the R&D investment requires 80 million yuan +, and it also requires more than 5 years of process data accumulation.
V. Difficulties in the design of GMP clean, anti-sticking, and easy-to-clean structures
Fully sealed with no dead corners + anti-stick property
Contact material: 316L stainless steel + mirror finish (Ra ≤ 0.8μm), without grooves, no dead corners, easy to clean.
Molten pills / The soft material has strong adhesion. A food-grade anti-adhesion coating is required along with a small amount of alcohol misting. The coating has a short lifespan (3-6 months) and is prone to peeling off in domestic production.
CIP online cleaning + negative pressure dust removal
It should be **quickly disassembled within 10 minutes**, capable of being soaked for cleaning, and with a slight negative pressure (-5 to -10 Pa) for dust removal. This prevents dust from spilling out and avoids cross-contamination.
The domestic sealing components and quick-release structures have poor reliability and frequently experience powder leakage and water leakage.
Modular flexible reconfiguration
Multiple specifications (Φ3 - 15mm) and multiple dosage forms (water pills / honey pills / concentrated pills) can be switched quickly without tools in less than 5 minutes.
Most of the domestic products have a fixed structure. Changing the model requires disassembling the molds and adjusting the gaps, which takes 30 to 60 minutes and results in significant waste.
Please provide the text that needs to be translated accurately and fluently into
VI. Summary of Key Technical Challenges (Remember in One Sentence)
Material control difficulty: The rheological properties of the soft material are unstable, sensitive to temperature and humidity, and there are significant batch-to-batch variations.
The production process is unstable: the mold is worn and sticks to the material, with significant pressure fluctuations, making it difficult to meet the required accuracy for the pellet weight.
Difficult to achieve uniformity: At high speeds, there is a contradiction between the roundness and the damage rate, and the flexibility and adaptability are poor.
Control difficulties: Low online detection accuracy, weak AI algorithms, and insufficient adaptive capabilities;
Compliance is difficult to achieve: GMP's clean, anti-sticking, and easy-to-clean structural design and material lifespan shortcomings.
Please provide the text that needs to be translated accurately and without
|
|
|
0938-2721678 
甘公网安备 62050302000280号