Saati Textil PV Photopolymer Emulsion
Saati Textil PV is a red photopolymer emulsion designed for textile printers using plastisol inks. It can also be used with water-based ink systems, however post exposing your screen is required.
It is 42% solids and presensitized so that pre-mixing sensitizer is not required. PV is a fast exposing emulsion so care should be taken during handling to avoid exposure to daylight, quartz/halogen lamps, cool white fluorescent lamps, or discharge lamps.
Red in color, this photopolymer emulsion offers 42% sensitized solids and 6000 CPS sensitized viscosity. Excellent for all type of plastisol applications. Saati PV emulsion should last 12 months. Saati PV will work well with mesh counts of 74 or higher.
Exposure Time Reference:
When using a 3KW Metal Halide Exposure lamp on mesh counts from 80 to 300 as a guide, set your exposure time between 160-200 seconds. On mesh counts of 300 to 350 allow 50 to 60 seconds exposure, and for mesh counts of 350 or more allow 30 to 45 seconds for exposure. Remember, these exposure settings should only be used as a guide since exposure time will vary depending on equipment used, lamp life, type of emulsion, and applied coatings.
It is not recommended to finish the last coating on the print side of the screen. Finish the last coating on the squeegee side. If the coating ends on the print side, the E.O.M. thickness will decrease and go thinner on the print side. This will cause premature stencil breakdown and poor ink deposit.Shelf Life - Approximate shelf life for this emulsion is 24 month (2 years) when stored at room temperature. It should not be stored at temperatures above 80f (27c) or below 37f (0c). For best results it should only be stored in its original container.
Emulsion Exposure Differences
Proper screen exposure must take many factors into account – the emulsion type, coating thickness, exposure unit, etc. As a general guideline for the different emulsion types (diazo, dual cure, and photopolymer) use these times as a reference.
Photopolymer – These are typically the fastest exposing emulsions, with many exposing correctly from 30-50 seconds. The shortest times can be seen when using a newer LED-type exposure unit.
Dual Cure – If you have established a good exposure time with photopolymer emulsions, you can typically add 90 seconds (1.5 minutes) to that time for most dual cure emulsions.
Diazo - If you have established a good exposure time with photopolymer emulsions, you can typically add 210 seconds (3.5 minutes) to that time for most diazo emulsions.These times will depend heavily on your exposure unit and should only be considered as a starting point.