Inline Medical Tablet Thickness Inspection

Engineering Challenge

In solid dosage pharmaceutical manufacturing, tablet thickness variations indicate compression force instability and threaten content uniformity compliance. Relying on manual offline sampling leaves massive quality control blind spots during high speed production. Attempting to automate this with inline mechanical contact probes is ineffective; the physical tips bounce at high speeds and scratch friable tablets, causing cross contamination and mechanical jamming.

SinceVision Solution

Facilities integrate the SinceVision SD33-30 point laser displacement sensor directly above the rotary tablet press discharge chute. Utilizing non contact optical triangulation, the sensor captures absolute vertical height data. This setup provides 100 percent inline thickness measurement of passing tablets without physical contact, instantly identifying tooling wear or powder flow anomalies.

Hardware Specifications (SD33-30)

• Sampling Frequency: 3 kHz (capturing 3,000 measurements per second for extreme line speeds).

• Repeatability: 2 μm (detecting microscopic deviations in compression force).

• Reference Distance: 30 mm (keeping the sensor safely clear of passing product and powder dust).

• Measurement Range: ±4 mm (accommodating diverse dosage sizes).

• Linearity: ±0.1% F.S.

Operational Impact

• Zero Product Damage: Purely optical measurement eliminates the abrasion, chipping, and contamination caused by mechanical probes.

• Real-Time Deterministic Rejection: Transforms lagging offline sampling into continuous process control, preventing batch quarantines.

• Material Flexibility: Advanced exposure control algorithms automatically adapt to uncoated, film coated, and highly reflective enteric coated tablets without mechanical recalibration.