The following is a detailed explanation of the technical principles and applications of the pilot dry granulation machine:

1、 Core working principle

The pilot dry granulation machine achieves direct conversion from solid powder to particles through mechanical compression, without the need for liquid adhesives throughout the process. The process is divided into three stages:

• Pre compression molding: The powder is uniformly conveyed by a spiral feeder to the gap between the double pressure rollers (roller diameter of φ 200-400mm), forming a 2-5mm dense thin sheet under high pressure of 10-50MPa;

• Controllable crushing: The serrated crushing knife decomposes the thin sheet into primary particles at a speed of 500-1500rpm;

• Particle size classification: The rotating sieve (adjustable between 20-80 mesh) accurately separates the target particle size, and the fine powder is recycled for reuse.

This process saves more than 30% energy compared to wet granulation and avoids the risk of degradation of thermosensitive components.

2、 Technical characteristics of the pilot model

Key innovations for process scale-up validation requirements (processing capacity of 5-50kg/h) include:

Dynamic pressure regulation: Servo motor controls the roller spacing (with an accuracy of ± 0.01mm) to compensate for material flow fluctuations in real-time;

Quick module replacement: The pressure roller and screen support material switching within 15 minutes, adapting to the development of multiple varieties;

Online quality monitoring: Near infrared probes synchronously detect particle moisture (± 0.5%) and bulk density (RSD<3%).

3、 Deep analysis of industrial applications

1. Pharmaceutical industry

• Solve the stability problem of easily hydrolyzed drugs (such as amoxicillin and clavulanic acid potassium), with particle dissolution meeting the USP<30 minute standard;

Shorten the production cycle of traditional Chinese medicine preparations by 50%, reducing energy consumption and solvent pollution.

2. Development of new materials

• Improve the tap density of lithium iron phosphate cathode material by 15% -20%;

Optimize the angle of repose of food additives (such as silica) particles to<35 ° to enhance fluidity.

3. Chemical production efficiency improvement

Improve the uniformity of powder mixing and reduce delamination losses during transportation;

Suitable for direct granulation of powders with a moisture content of ≤ 5%, simplifying the pretreatment process.

4、 Operation optimization and fault response

• Laminated failure: Due to insufficient plasticity of the material, adding 1% -3% microcrystalline cellulose can significantly improve it;

Excessive fine powder rate: Reduce the speed of the crushing blade to below 800rpm and control the roller pressure line speed to be less than 0.3m/s;

• Capacity fluctuations: Regularly check the wear clearance of the feeding screw (if it is greater than 0.5mm, it needs to be replaced).

5、 Technological Evolution Direction

Intelligent process modeling: AI algorithms predict the pressure particle size relationship curve and achieve parameter self optimization;

Continuous integration: coupling powder direct pressing equipment to form a closed-loop production line, reducing intermediate pollution;

Green material substitution: Developing bio based lubricants to replace magnesium stearate and reduce cleaning validation costs.