Evaluation of tablet punch configuration on mitigating capping by a quality by design approach.

Capping is a common problem in the manufacture of some types of tablets and unless resolved, the tableting process cannot proceed. Hence, all factors that can help to lessen the likelihood of capping without unnecessarily reduce turret speed and/or compaction force would be tenable. This study investigated the influence of tablet punch configuration on mitigation of tablet capping.

Tablet compression tooling - Impact of punch face edge modification.

The influence of punch face edge geometry modification on tablet compression and the properties of the resultant tablets produced on a rotary press were investigated. The results revealed that tablets produced from the punches with radius edge face geometry consistently displayed better physical quality; higher tensile strength and lower capping tendency. Modification of the angled edge of the bevel face to the curved edge of the radius face, enabled deeper punch penetration in the die cavity during the compression cycle, bringing about greater compact densification.

Influence of the Punch Head Design on the Physical Quality of Tablets Produced in a Rotary Press.

This study aims to investigate the influence of tablet punch head design on compaction and the resultant tablet mechanical properties. Tablets were prepared using flat-face punches with different head flat and head radius configurations, on a rotary tablet press with compression rolls of different diameters. The results showed that tablets produced using punches with head flats consistently displayed higher tensile strengths and lower capping tendencies.

Direct microneedle array fabrication off a photomask to deliver collagen through skin.

Purpose: To fabricate microneedle arrays directly off a photomask using a simple photolithographical approach and evaluate their potential for delivering collagen.

Methods: A simple photolithographical approach was developed by using photomask consisting of embedded micro-lenses that govern microneedle geometry in a mould free process. Microneedle length was controlled by use of simple glass scaffolds as well as addition of backing layer.