We are preparing different types of rubber composites for sealant applications. We are using different volume of mixers and for curing we are using Calendaring machine.
when you achieve a stable curve of shear vs. time, we can assume the mixing is complete
For indicative confirmation of uncured mixture, you could utilize Py-FTIR. For inorganic fillers, also XRF can be helpful.
There are many methods but common are: green strength, tackiness or filler dispersion test by optical methods(ASTM D7723 or D2663) etc... Other routine tests like MDR or RPA can also used, but you need control charts to correlate.
Thank you all for the valuable answers. I am fully aware of the testings such as green strength, tackiness.
I am working in a industry where there are more than 15 different batches and grades produce on daily. So I need to develop a method to analyse each batch before it going for calendaring (curing). the above mentioned tests are not easy to implement for each batch.
It is important to to develop a method for this otherwise if any form of mistakes lead to greater production loss. I proposed to purchase Rubber Process Analyzer (RPA). but it is still not under consideration from the purchase department.
It is really appreciate if any better suggestions for this issue.
Disper Grader is very nice for confirming about proper mixing.I request refer my publication by Rubber Chemistry & Technology
Dispergrader model disper GRADER+, Tech Pro, USA, as per ISO 11345 method B. This technique is based on interferometric microscopy (IFM) and utilizes the interference fringes between in-phase light beams reflected from the rubber sample and a smooth reference surface to measure the three-dimensional surface topography.
Thank you so much Dr. Sasidharan Krishnan for your valuable suggestions.
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