Core Influence of Particle Shape And Particle Size And Process Optimization Scheme

01 Particle morphology: determines the compaction performance and structural strength of tablets. In the production of pharmaceutical tablets, there are significant differences in the fitting ability, elastic deformation characteristics, and stress stability of particles with different morphologies, which directly affect the structural strength, molding integrity, and batch yield of tablets. This is the fundamental point of process control.

✅ Irregular rough particles: The preferred powder structure for pharmaceutical tablet molding is this type of particle with clear edges and rough surfaces. Its core advantage is strong mechanical interlocking force between particles.

During the compression process, this type of particle can achieve all-round adhesion and mechanical interlocking, greatly improving the contact area and bonding stability of the powder. The formed tablet has a dense structure, compliant mechanical strength, strong wear resistance, and no loose or falling powder problems, fully meeting the quality standards of pharmaceutical products. Its comprehensive forming performance is excellent.

The only control weakness of this powder is weak fluidity, which can lead to uneven filling and fluctuations in tablet weight under high-speed compression conditions. In response to this issue, Muling Machinery's high-precision and high-speed tablet pressing die adopts micrometer level hole accuracy and smooth inner wall technology, which can effectively reduce particle filling resistance, optimize filling uniformity, compensate for the short board of powder flowability, and adapt to the production needs of high-speed continuous tablet pressing.

✅ Spherical smooth particles: suitable for high-speed pharmaceutical production, with structural strength shortcomings

Spherical smooth particles have excellent fluidity and high uniformity and consistency in filling the mold holes, which can effectively ensure compliance with tablet weight differences. They are suitable for high-speed automated continuous tablet production lines in the pharmaceutical industry and can greatly improve mass production efficiency.

But it has obvious performance shortcomings: the particle surface has no edges and corners, unable to form a mechanical interlocking structure, and the particles only rely on intermolecular forces to achieve bonding, resulting in low bonding strength.

The overall structure of the molded tablets is loose and the mechanical strength is low. During the transportation, packaging, and storage of finished products, quality problems such as powder loss and looseness are prone to occur, which poses a risk of compliance release and insufficient molding stability.

❌ Striped, needle shaped, and flake shaped particles: high-risk powder structure for pharmaceutical tablet pressing

In the pharmaceutical compliance production system, irregular particles such as strip-shaped, needle shaped, and flake shaped particles are the main causes of major quality defects such as tablet fragmentation, top cracking, and delamination, and belong to high-risk powders that are key controlled in the tablet pressing process.

This type of irregular particle has a large amount of elastic deformation, poor plastic forming ability, and is prone to deformation under pressure. After unloading the pressure, the rebound stress is significant, directly causing structural cracking and delamination of the tablet, resulting in unqualified finished products and batch scrap

During the pre granulation and screening process, irregular particles are prone to bridging, resulting in uneven filling of mold holes and disrupting batch quality consistency, which does not meet GMP control requirements. Pharmaceutical companies can optimize particle properties through pre granulation and screening processes, coupled with suitable high-precision stamping dies, to avoid potential hazards in high-speed tablet production in both directions.