Photo Screen Emulsion

In the process of rotery screen engraving it is the emulsion that forms the link between the image & the screen & playing a vital role. Quality of the image, mechanical resistance to all printing paste, the runability & Photo efficiency are the outstanding features of Bluecoat 414 - PHOTO SCREEN EMULSION. For exposing the screen following procedure is to be followed.

Preparing & Applying

1.Preparation of Emulsion

Take 1 Kg of Bluecoat 414 Emulsion in a clean vessel & also take 50 ml. of sensitizer. Mix them together for sometime till the colour of Emulsion is changed to light uniform green. Viscosity of the Emulsion can be changed by adding DISTILLED WATER depending upon mesh of the screen & technique of coating - i.e. machine coating or hand coating. Filter this emulsion with bolting cloth & close the vessel for 1 hour in cool dark place so that all the air bubbles are disappeared.

2.Degreasing & Cleaning the Screen

A completely grease free screen is required in order to achieve good fixing of Emulsion to the screen. Even if the screen is being used for the first time it is required to be degreased with the degreaser, by giving good rinse & immersion in degreaser & subsequent cleaning with pressure of water. Allow it to dry in a dust free area.


3.Coating of Emulsion

Direct Emulsion Coating requires skill to produce uniform pinhole free coating. Bluecoat 414 Emulsion can be applied to a screen by using circular rubber squeegee. I