Question

What is compact? How is it prepared?​

Answer 1

Answer:

testing machine. The applied pressures were 50-200 MPa for HCP and 200 MPa for HC, and each pressure was maintained for 10 min. Here, pressure is defined as the applied load divided by the cross-sectional area of the compact. After each compaction, the molds were cleaned with a nylon scrubber. An example of a prepared compact is shown in Fig. 2. Because of the mold size, the prepared compacts were cylinders with a diameter of 52 mm and a height of 60 mm. Because the height of the cylinders could be varied depending on the applied stress, the amount of powder was adjusted such that the compacts had the ...

Answer 2

Explanation:

The compact powders are prepared by mainly three methods

Wet method: The water is used for preparation wet mass. All basic ingredients are mixed with other ingredients like coloring agents and binding agents. The formulated pastes are pressed into moullds and slowly products are dried by air. This method is not widely used because product may cracks during preparation.

Dry method: in this method water should not used. The all basic ingredients are mixed with binders compressed with special presses with the help of pressure. This method is carriedout under controlled conditions.

Damp method: This method is most widely used method for preparation of compact preparation. This maily used for commercial purposes. The dasic powder, colour and perfumes are mixed in a proper manner. Then add liquid binder to the mixture. The liquid binder mainly aqueous mucilages or mucin rich emulsion. Then it is properly blended until desired plasticity of product obtained. The obtained product paseed through screen and then compressed by machine. Finally the obtained product is dried at elevated temperature.

The binders are play an important role in the preparation of compact powders.