Tillie Doyle
A coating pan is a machine that coats the external surface of tablets with ingredients to mask unwanted odours and tastes, as well as improve their appearance. To achieve a good tablet coating, it is important to calculate the coating pan capacity. This is determined by the brim volume of the coating pan and the bulk density of the tablets. Brim volume refers to the total volume of water when the pan is filled to the brim at its current position. The formula for calculating the coating pan capacity is: Pan Capacity (in kg) = Brim Volume (in litres) x Bulk Density of Tablets (mg/ml). The minimum capacity of the coating pan is 60% of the maximum capacity calculated.
| Characteristics | Values |
|---|---|
| Factors determining coating pan capacity | Brim volume and bulk density of tablets |
| Brim volume | Total volume of water when the pan is fully filled at its current position |
| Calculation of coating pan capacity | Brim volume (in liters) x bulk density of tablets (mg/ml) |
| Minimum capacity | 60% of maximum capacity |
| Maximum capacity | 80-90% of total pan capacity |
| Minimum working capacity | 50-60% of total pan capacity |
| Coating pan capacity | Available in different ranges |
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What You'll Learn
Brim volume and bulk density
The capacity of a tablet coating machine pan is calculated by the brim volume of the coating pan and the bulk density of the tablets. Brim volume is the total volume of water when the pan is completely filled with water in its current position. It is different from the total volume of the pan. Brim volume is usually provided in the equipment manual.
The maximum capacity of the pan is calculated using the formula: Maximum Capacity of Coating Pan (Kg) = Brim Volume (ltrs) X Bulk Density of Tablets (mg/ml). The minimum capacity of the coating pan is 60% of the maximum capacity. The minimum capacity can be calculated as: Minimum Capacity of coating Pan (Kg) = Brim Volume (ltrs) X Bulk Density of Tablets (mg/ml) X 60/100.
The bulk density of tablets is a crucial factor in determining the capacity of a coating pan. The size and shape of the tablets influence the bulk density, with smaller tablets of the same formulation having a higher bulk density than larger tablets. Therefore, the maximum and minimum capacity of the coating machine depends on the size and shape of the tablets.
It is important to note that the quantity of tablets used for coating plays a significant role in achieving good coating results. An inadequate quantity of tablets in the pan may lead to coating problems. Thus, the working capacity of the coating machine should be determined by considering both the brim volume and the bulk density of the tablets to ensure a uniform coating.
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Minimum capacity
The minimum capacity of a coating pan is the lowest quantity of tablets that can be smoothly coated in a single batch. Typically, the minimum capacity of a coating pan is between 50% and 60% of its maximum capacity.
To calculate the minimum capacity of a coating pan, you need to first determine its maximum capacity. The maximum capacity of a coating pan is calculated by multiplying the brim volume of the pan (in litres) by the bulk density of the tablets (in mg/ml). The brim volume refers to the total volume of water that the pan can hold when filled to the brim or upper edges, and it is usually provided by the manufacturer in the equipment manual.
Once you have calculated the maximum capacity, you can determine the minimum capacity by multiplying the maximum capacity by 0.6 (or 60%). For example, if the maximum capacity of a coating pan is 420 kilograms, then the minimum capacity would be 0.6 x 420 kg = 252 kg.
It is important to note that the minimum capacity of a coating pan can affect the coating process. If the pan is not filled to at least the minimum capacity, it may result in coating problems and affect the quality of the tablets. Additionally, the size and shape of the tablets can impact the minimum capacity, as changes in tablet size and shape will result in differences in bulk density.
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Maximum capacity
The maximum capacity of a coating pan is calculated by multiplying its brim volume (in litres) by the bulk density of the tablets (in mg/ml). Brim volume refers to the total volume of water when the pan is filled to the brim or upper edges at its current position. This is different from the total volume of the pan. The brim volume can be found in the equipment manual or provided by the manufacturer.
The calculation for maximum capacity is as follows:
For example, a 48” coating machine pan with a brim volume of 160 litres and a bulk density of 620 mg/ml would have the following maximum capacity:
It is important to note that the maximum capacity of a coating pan is not always utilised. This is because, after weight gain, tablets may fall out when the door is opened. Therefore, the maximum working capacity is generally considered to be 80-90% of the total pan capacity.
The size and shape of the tablets can also affect the coating machine's maximum capacity. Larger tablets have a lower bulk density than smaller tablets of the same composition, which results in a lower maximum capacity.
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Tablet quantity
The tablet quantity or coating pan capacity is an important consideration when using a coating pan to mask unwanted odours, taste or improve the appearance of manufactured products. The capacity of the coating pan is calculated by multiplying the brim volume of the coating pan by the bulk density of the tablets. Brim volume refers to the total volume of water that can be added to the coating pan when it is fully filled at its current position. This is different from the total volume of the pan. The brim volume is provided in the equipment manual.
The formula for calculating the coating pan capacity is:
Pan Capacity (in kg) = Brim Volume (in litres) x Bulk Density of Tablets (in mg/ml)
For example, a coating pan with a brimful volume of 600 litres and a tablet bulk density of 0.7g/ml would have a capacity of:
600 litres x 0.7g/ml = 420 kg
The maximum working capacity of a coating pan is generally 80-90% of the total pan capacity. This is because if the pan is filled to 100% capacity, the tablets will fall out when the door is opened after weight gain. The minimum working capacity of a coating pan is usually 50-60% of the total capacity. If the pan is filled to less than 50% capacity, the tablets will not be properly coated and the rotation of the tablets will be affected, impacting the quality of the coating.
The size and shape of the tablets also affect the coating pan's capacity. Large-size tablets have a lower bulk density than small tablets of the same composition, so the maximum and minimum capacities of the coating pan will be different for tablets of varying sizes and shapes.
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Coating quality
To ensure the quality of coated tablets, several factors need to be considered during the coating process. Firstly, attaining a uniform colour distribution is essential. This means ensuring that the colour is evenly distributed across the tablets, creating a consistent appearance.
Another critical aspect is achieving a smooth coating surface before the polishing stage. If the coating is not smooth enough, it may result in a marbled appearance after polishing due to wax collection in small surface depressions. Therefore, it is crucial to focus on creating a smooth surface during the coating process itself.
The tablet coating process often involves dealing with sticky formulations, especially as they start to dry. This stickiness can cause tablets to adhere to each other, compromising the quality of the coating. To mitigate this issue, it is important to manage the drying stage effectively and ensure that the tablets are thoroughly dried before proceeding to the polishing step.
Moisture content is another critical factor influencing coating quality. Excessive moisture can lead to issues like "blooming," where the polish appears foggy, or "sweating," where moisture beads form on the tablet surface. To prevent these problems, it is essential to maintain appropriate moisture levels during the coating process, ensuring the tablets are adequately dried before polishing.
Additionally, the speed of the coating pan and the spray rate are important variables that impact coating uniformity. Adjusting the pan speed and spray rate can help achieve a more consistent coating across the tablets. The number of spray guns used can also affect coating weight uniformity, with a higher number of spray guns contributing to reduced weight gain variation.
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Frequently asked questions
A coating pan is a machine that coats the external surface of oral dosage forms with coating ingredients. Coating pans are available in different ranges, and their selection depends upon the coating pan capacity required.
The capacity of a coating pan is calculated by multiplying the brimful volume by the tablet bulk density. Brimful volume is the volume of the water that can be added to the coating pan up to its brim or upper edges. The brimful volume is different from the total volume of the pan and is usually provided in the equipment manual.
The maximum capacity of a coating pan is calculated by multiplying the brim volume by the bulk density of the tablets. The maximum capacity is usually between 80% and 90% of the total pan capacity.
The minimum capacity of a coating pan is usually between 50% and 60% of the maximum capacity. If the capacity falls below 50%, it may affect the tablet quality.
