Dip Coatings

Dip coating is the type of coating in which the material is dipped in the coating material and then rinse and dried. There are many different tools used to dry the coating. Dip coating is the traditional method and hold only the liquid coating of the materials. Usually the metal pieces are first dip in the coating material and then suddenly baked in order to dry the coatings.

Dip Coating Process

The dip coating is carried out in three stages

1. Immersion: the immersion process involves the material to dip in the coating at constant but rapid speed. This rapid speed will avoid forming judders on the material and thus gives a more fine and smooth texture. The material is dipped and pulled back that causes the solvent evaporation and thus form a smooth layering. Through solvent evaporation, a polymeric membrane is formed on the metals that are more useful. The material is dipped more in order to gain a thick layer.
2. Dwell Time: this process involves the dipping of material for several times in the coating without producing any motion. This is usually required to form a thick and smooth layer.
3. Withdrawal: after a constant dipping, the material is then withdrawn at a rapid speed in order to avoid the formation of judder. Faster the rate of withdrawal, thicker will be the coat formed on the material.

Plastic materials are usually used for dip coating. Plastic dip coating requires a faster rate of dipping as there is more threat of forming the judder on the plastic. The plastic coating needs different process among them the thermoplastic is the most useful. This provides a long-term coating and helps in preventing corrision. Similalry the thermoplastic coating is chemical resistant and provides attractive decorative finishing. Plastics coating is little thicker than the standard paints. The most attractive advantage of plastic dip coating is that it is impermeable to water. Thermplastic dip coating is considered to be the best as these provide long term protection of the material on which it is applied. Thermoplastic coating requires two types of diping either fluidised bed dip coating or electrostatic process. Let summeraize their advantages and disadvantages

Fluidized Bed Dips Coating

1. It provides 100% of efficiency in coating.
2. It is a faster process of coating.
3. It provides thick coating and protection to the material thus increases the life of material.
4. Provides resistance against water and chemicals.
5. It provides maximum attraction to the material.

Electrostatic Dip Coating

1. It provides thin coating to the material.
2. It is less expensive than other types of dipping coat.
3. It provides less resistance to the environmental condition.

Plastisol liquid dip coating involves the use of plastisol. The plastisol provides a thick coating to the material. It prohibits the thermal and electric insulation of the material. Plastisol also provides the decorative coating to the material. The plastisol coating is usually held on the metal material as it provides the safety and prohibits the electric shock if occurs any problem. The properties that the plastisol have are the tensile strength, elongation, chemical and weather resistance, heat and light stability. Dip coating for wire mesh provides safety to the electric wires.

Dip coatings provides various advantages to the material. First the material used for dip coating holds various properties in it that it-self provides great protection to the material. The powder dip costing is very useful and increases the life of a material. Simply the material is heated in the oven and dipped in a powder coating. This provides a thick layer and great protection to the material from environmental protection. Liquid dip coating is more in use rather than powder dip coating but actually the powder dip coating is more useful.