Fine powder and debris should be sieved before coating.
(1) The barrier layer refers to a layer of insulation that is isolated from the core of the core. Tablets containing acidic, water-soluble or moisture-absorbing ingredients must be coated with a barrier layer, the purpose of which is to form a water-impermeable barrier that separates the core from the coating layer and prevents coating.
The water in the syrup penetrates the core of the tablet, causing the tablet to swell and cause the tablet to rupture or discolor the icing. The isolation layer also has the functions of increasing core hardness, firmness, and adhesion. When the separator is coated, the core is rolled in a coating pan, and a rubber pad of a suitable temperature is added to uniformly adhere to the surface of the coating, and dried by blowing hot air. In order to prevent the tablets from sticking to each other or adhering to the coating pan, an appropriate amount of powder material (such as talcum powder) may be added until it is just stuck. The drying temperature is 40 to 50 ° C, and the layers of 3 to 5 may be repeated.
(2) Powder coating layer In order to rapidly increase the thickness of the coating layer to eliminate the original angular shape of the tablet, the outer layer of the separating layer is further coated with a powder coating layer, and the powder coating layer can be directly applied to the tablet which does not need the covering layer.
During operation, the tablet continues to roll in the coating pan, adding syrup (or a mixture of sucrose and gum arabic) to evenly wet the surface of the tablet, adding talcum powder and sucrose powder. Make the stick on the surface of the tablet, continue to roll and blow dry, repeat the above operation several times. Until the edge of the tablet disappears. Generally need to pack 15~18 layers.
(3) The operation of the sugar coating layer is basically the same as that of the coating layer, but the coating material only uses syrup. As the syrup slowly dries on the surface of the tablet, it forms a fine and smooth surface and a solid film, generally 10 to 15 layers.
(4) The colored sugar coating material is a colored syrup. The purpose is to make the piece of clothing have a certain color, improve the appearance, easy to identify or play a light-shielding effect (adding food coloring and titanium dioxide to the syrup), generally use color paddles in the last few sugar coatings, the color paste should be from shallow to deep And pay attention to the layer is dry. Generally, it takes about 8~15 layers.
(5) The final step of polishing is the purpose of coating the surface of the sugar-coated tablet to be bright and beautiful, and has a moisture-proof effect. In operation, the wax powder is added to the coated color of the tablet, and the surface of the sugar coating is glossy due to the friction between the tablet and the tablet and the wall of the pot. For example, adding 2% silicone oil (called a glossing agent) to Sichuan wax can make the surface more bright. The coated tablets are taken out and dried for 24 hours.
Of course, there are many kinds of sugar-coated machinery, including large sugar-coated machines, small sugar-coated machines, sugar-coated sugar-coated machines, closed coating machines, and so on.