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The upper point was the minimal laser peak power to form micro-bubbles in the shells and was variable with the formulation. The lower point was the minimal laser peak power to form the black particles and was constant regardless of the dosage forms, for example film-coated tablets, soft gelatin capsules and hard gelatin capsules. In the relationship between laser peak power of a pulse and dE, there were two inflection points.

The formation of many black particles which were agglomerates of oxygen-defected TiO2 was associated with the printing. The capsules could be printed gray by the UV laser. The color strength of the printed capsule was determined by a spectrophotometer as total color difference (dE). The capsules were irradiated with pulsed UV laser at a wavelength of 355 nm. Hard gelatin capsule shells containing 3.5% TiO2 were used in this study.

The purpose of this study was to examine the application of ultraviolet (UV) laser irradiation to printing hard gelatin capsule shells containing titanium dioxide (TiO2) and to clarify how the color strength of the printing by the laser could be controlled by the power of the irradiated laser.

Hosokawa, Akihiro Kato, Yoshiteru Terada, Katsuhide Imprinting on empty hard gelatin capsule shells containing titanium dioxide by application of the UV laser printing technique.

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