Calculation of Coating Solution
Coating solution is about two things
- Solvent: purified water or alcohol
- Solid content: Coating formulations
When we say the concentration of the coating solution is 10%, what does it mean?
- 10% solid content
- 90% Solvent
How do I know how to calculate the amount of solution based on the amount of tablets?
For example, you have a 1000 mg tablet and you want to add 50 mg to reached the weight of the tablet to 1050 mg.
This means that you will need 50 mg for each tablet. If you have, for example,you have 100,000 tablets (100 kilograms), then the 100,000 tablets are multiplied by 50 mg, which is the weight gain. Then we will need 5 kilograms of coating formulations, and of course we will calculate the loss during spraying and we will increase the solution, which is Normally, in most cases, we increase from 20 to 25% of this if the size of the batch is suitable inside the drum..
What is the loss of solution and what I can do when adding any excess?
1: The size of the batch in the drum will be how many of the drum’s capacity.
2: The length of the hoses through which the solution is transferred to the guns, because if a large machine naturally has long hoses, the hoses, their length, and their diameter.
3: The type of solution, is it aqueous or non-aqueous, because the natural thing in any non-aqueous solution is that its rate of evaporation and fragility is higher.
4: the Setting process that occurs for the spray line and the guns that occur before the coating.
5: The temperature at which we will work, because if the temperature is high, the amount of solution will be lost during spraying.
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