Sep 24, 2025
Tablet Defects in Tablet Manufacturing: How to Solve
A wide array of tablet defects can arise during tablet manufacturing and tablet coating, compromising pill quality and drug efficacy. Common issues such as capping, cracking, chipping, and sticking/picking present challenges for tablet manufacturers. For better eliminating defects in tablets, we explore root causes of these frequent tableting deffects and provide practical solutions to handle and prevent defective tablets, ensuring a robust tablet manufacturing process. 1 Tablet Defects Related to Tablet Appearance and Integrity This category of tablet defect directly affects the appearance of drug tablets, patient medication experience, and image of pharmaceutical manufacturers. Root causes of these tablet defects are often related to granule properties (moisture content, cohesive strength, granule flowability), equipment parameters (pill press pressure, tablet pressing speed, tablet presser tooling condition), and environmental conditions (humidity, temperature). In actual tablet manufacturing, it is necessary to follow the process of "troubleshooting tablet granules → adjusting pill presses → controlling tablet pressing environment" to handle specific defects of tablets and let quality of medication tablets meet tablet production standards. In the following paragraphs, we will indicate 5 main tablet defects in tablet manufacturing. Defect Type Appearance Characteristics Occurrence Location Common Causes Cracking Fine linear cracks (no material loss) Surface or internal Insufficient binder, overly dry granules Capping Top/bottom annular layer separation Upper/lower punch contact surface High granule elasticity, excessive main compression force Chipping Edge chipping / burrs (small fragments broken off) Tablet edges Worn die bores, poor granule flowability Sticking Rough, sticky surface with powder adhering to punches Entire surface High moisture content, low punch smoothness Picking Surface defects/holes corresponding to punch engravings Punch engraving, recess area Punch recess, excessive fine powder Flaking Flaky surface layer peeling Random surface areas Uneven binder distribution, insufficient pre-compression 1.1 Cracking Tablet cracking refers to the appearance of irregular fine cracks inside or on the surface of a tablet. These cracks may run through entire cracked pills or be localized. These defective tablets typically show no obvious signs of material breaking off and often require close observation or light pressure to be detected. ●Appearance Characteristics of Cracking ○Linear fissures are visible on the surface or in the cross-section, with a color consistent with the tablet body. ○Cracks may be distributed along the tablet diameter, edge, or center, and these defective tablets are prone to breaking under compression force. &n...
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