A Detailed Discussion of Blend Times and Lubricating Times
Source : Yenchen Technical Process Consultant, Dr. Fred Rowley
A Detailed Discussion of Blend Times:
Goal One: Perfect Content Uniformity
Materials go from an unmixed state to a state of relative homogeneous consistency. Achieving a homogeneous blend is accomplished through a combination of time and mechanical energy. Given enough time, components will pass from an unblended state to a relatively homogenous blend and back to an unblended state. Blend studies determine the optimum endpoint. All blends have a unique pathway to their optimum state of uniformity.Goal Two: Perfect (Not Precise) Lubricant Distribution
- Insufficient blending of the lubricant is confirmed with tablets having (sometimes) picking and sticking and ejection problems with some portions of the blend while having (sometimes) tablet lamination combined with soft tablets with other portions of the same blend.
- Excessive blending of the lubricant is confirmed with tablets having lamination/soft tablets throughout the entire batch. Tablets in many cases cannot achieve even minimum specification hardness. Lamination may occur in both the upper and lower regions of the tablet. Disintegration may or may not be affected and dissolution may be bad even when the disintegration is good.
If you have any technical questions, please contact with Grace Chiang Email:grace.chiang@yenchen.com.tw
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