The document discusses the tablet coating process, which serves to mask taste, facilitate swallowing, and protect active pharmaceutical ingredients. It details three primary coating types: sugar, film, and enteric coatings, along with their methodologies and purposes. Coating techniques are explained, including the use of various equipment like pan coaters and fluidized bed systems to ensure even application and effective coating.

1. Prepared By: AJITH KUMAR R
B PHARM INDUSTRAL PHARMACY
VIVEKANANDA COLLEGE OF PHARMACY
TABLETCOATING

2.  A tablet coating is a process of
covering over a tablet which is used to
mask the taste, make it easier to
swallow, or protect the active
medication inside.
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3.  Protecting against light , air and moisture
 Protecting API (Active Pharmaceutical
Ingredient) against digestive fluids.
 Better identification of tablets.
 Avoid side effects.
 Provides a delayed release of medication.
PURPOSE OF COATING
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4. TYPES OF COATING
There are mainly 3 types of coating
• Sugar Coating
• Film Coating
• Enteric Coating
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5. 1. SUGAR COATING
• This involves application of sugar (sucrose)
based coating solution to the tablets.
• It is carried out in coating pans having
variable capacities and mounted at an angle
of 40º
• The coating is water soluble and dissolves
after swallowing
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6. •The sugar coating involves following
steps:
i. Sealing
ii. Sub coating
iii. Syruping
iv. Finishing
v. Polishing
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7. SEALING
 The tablet core must be sealed, dried and
free from any residual solvents.
It prevents moisture penetration into the
tablet core
Seal coating agents are Oleic acids, PEG-
4000, Alcohol, Methylene glycol.
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8. SUB COATING
 It is actual starting of coating process and
acts as the foundation for smoothening and
polishing.
Sub coating is applied to build up tablet size
and to form uniform edges.
It increase the tablet weight from 50-100%
Eg: Gum acacia, Corn syrup, Gelatine.
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9. SYRUPING
 It is done to cover the imperfections in the
tablet surface that is caused during sub
coating step.
 Eg: Colorant, Cane sugar powders, Calcium
carbonate, Corn starch.
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10. POLISHING
 The desired lustre to the tablet is obtained by
polishing.
 Tablets are polished in standard coating pans
by application of bees wax, paraffin wax or
warm solution of waxes in suitable volatile
solvents.
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11. 2. FILM COATING
 This technique is more used as compared to
sugar coating.
In this process there is deposition of a thin
film of polymer surrounding the tablet core.
 The film formed is very thin and it gives the
tablet a less weight and small size.
Eg: HPMC (Hydroxy Propyl Methyle
Cellulose), EC (Ethyle Cellulose), HPC
(Hydroxy Propyl Cellulose), etc.
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12. 3. ENTERIC COATING
Enteric coated tablets have delayed release
features.
They are designed to pass unchanged through
the stomach to the intestines where the tablets
disintegrates and allow drug dissolution and
absorption.
Eg: Omeprazole, Aspirin,etc
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13. MODE OF ACTION
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15. 1. Convention Pan Coater
They have circular metal pan mounted at 40º
 They are of 8-60 inch diameter.
 They are rotated on its horizontal axis by a
motor.
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16. PELLIGRINI COATING PAN
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17.  Heated air is supplied by inlet air supply.
Coating solutions are applied to tablets by
spraying the material on the rotating tablet
bed.
 It produces even distribution of coating
solutions or suspensions.
The inlet air are exhausted by means of ducts
through the front of the pan.
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18. IMMERSION TUBE COATING PAN
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19.  It consists of long tube with a spray nozzle at
its tip.
 Hot air as well as solution gets delivered
through this tube into the tablet bed.
Drying air flows upward and exhausted
through duct.
This is used for both sugar coating as well as
film coating tablets.
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20. 2. PERFORATED PAN SYSTEM
It is perforated or partially perforated drum.
 The coating solutions are applied to the
surface of the rotating bed of tablets through
spray nozzels which are present inside drum.
 Perforated pan coaters are efficient drying
systems with high coating capacity.
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21. ACCELA-COTA PAN
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22.  It consists of mixing blades.
Dry air is directed into the pan to the tablet
bed.
The spray gun sprays the coating solution
evenly.
Exhausted air moves out of the pan through
the suction shoe.
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23. DRIA COATER PAN
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24.  The dry air enters through hollow perforated
ribs located inside the periphery of the drums.
The spray evenly sprays the coating solution
as the coating pan rotates.
The drying air passes up through exhaust
which is present in the back of the pan.
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25. 3. FLUIDIZED BED SYSTEM
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26.  The movement of the tablets is upward
through the centre of the chamber.
Then they fall down towards the chamber
wall, re-enters the air stream at the bottom of
the chamber.
Coating solutions are applied from a spray
nozzle which is located either at the top or
bottom of the chamber.
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