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Drying Technology - Soft Capsule Manufacturing

Soft and Hard Capsules

The manufacturing of hard and soft gelatine capsules is an exacting operation that requires specific conditions to ensure the highest quality of the final product. Some of the many variables that must be dealt with include: gelatine concentration and viscosity; air temperature and humidity; lubrication of pins; stripping and cutting of capsules; inspection and sorting. When the ideal combination of all these factors is met, an acceptable, good quality capsule is produced.
Among these specific variables, manufacturers must deal with air, specifically in terms of temperature and humidity. Proper humidity control is essential during the manufacturing and drying of hard and soft capsules. Air goes directly onto the product and the quality and relative humidity of the air is extremely important.

It is essential to maintain the humidity as closely as possible to the required space conditions with very little variation, as variation in the humidity can cause a variety of problems. Under high humidity conditions, gelatine capsules do not dry properly; in an atmosphere that is too dry, they become hard and brittle. Ideal conditions are consistent humidity and temperature control.


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By Ing. Koen Egberts, International Sales Manager for Kathabar Systems Ing. Koen Egberts studied mechanical engineering at the High Technical School in Utrecht. After completing his degree he worked for several years at Asea Brown Boveri (ABB). He was responsible for the engineering and sales of the ABB Flдkt climate control systems.
Since 1998 he has held the position of International Sales Manager for Kathabar Systems Europe, a division of Imtech.

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Ing. Koen Egberts
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