Capsule leaks may be tiny, but they can cause major problems in softgel manufacturing. Keen to learn more about how the occurrence of leakers affects the production process, we interviewed 20 softgel manufacturers. Most of the interviewees worked in R&D, operations and quality in both health & nutrition and pharmaceutical companies. Here are the key findings:
Age-old problem
100 per cent of respondents said they had experienced leaking softgels at some point during the process (drying, production, storage, stability testing, transport and packaging). However, most leakers are detected during or after drying process, in rotating tumblers but also on trays. Furthermore, 85 per cent of softgel manufacturers had noticed a link between leaking softgels and their fill. According to the interviewees the occurrence of leakers is highly depending on the fill system. Lecithin, pastes and (herbal) powders are the most challenging fills. Interestingly, most softgel manufacturers accept leakers within certain parameters, imposing limits of between one and five per cent. This may demonstrate that a certain tolerance for leaker occurrence is necessary, as there has been no reliable solution to fully avoid leaking softgels.