Does anyone have any experience printing photoluminescent content inks on vinyl ?
The finished product would be exposed to sunlight in an exterior environment.
How to make photoluminescent printing ink ?
These are the guidelines to making photoluminescent printing ink. Your application may require some adjustments to the technical material below. Mix the photoluminescent pigment into clear vehicles. Any other pigment in the medium will obscure the luminosity. Such photoluminescent printing ink is suitable for many surfaces such as paper, textile, wood, plastic, metal, ceramic, etc.
1. Viscosity of ink should be about 3000-5000 micro-poises. During printing, viscosity should be adjusted by using a diluting agent based on printing speed.
2. Apply a white background coat under the luminous material layer to improve afterglow. Having the glow on top of any other color will diminish the glow strength.
3. 100 um film thickness is required to achieve the best results. If you want the maximum luminous effect use 130-150 um thickness. Sometimes more than one pass will be necessary to obtain the level of glow required, the second or more pass should wait until the last layer has dried.
4. If screen printing clothes try to use white fabric, any other color will decrease the glow. If using a non-white fabric, place a white layer below the luminous layer for the best glowing effect.
5. We have many variations of photoluminescent pigment. Use the chart to determine the pigment particle size to suit your needs. As a general rule of thumb, the larger the opening in the mesh the more glow you will have and it is suggested to use 80-100 mesh. We also carry small particles sizes for more detailed printing.
6. Due to the nature of the photoluminescent pigment, an anti-settling agent may be required. photoluminescent pigment is heavier than most vehicles and settling does occur. Therefore use a viscous vehicle or an anti-settling agent, but always stir before printing.
7. One kilogram of dry photoluminescent pigment can cover an area roughly 3.3 square meters or 12 square feet with a 150 um thick film. One gram covers approximately 25 square centimeters.
8. Use transparent inks with pH levels around 7.
9. Generally speaking 20%-50% by weight is the best ratio for mixing photoluminescent pigment to a vehicle. The percentage depends on how much glow is desired, how many passes you want to make, the screen mesh size, etc. Determine the thickness, size, and resolution of the printing area. If the base is a color other than white you may need to add more pigments to achieve desired results.
10. Do not grind the photoluminescent pigment. If there is deposit, use containers with ceramic or glass inner and stir it with high speed.
11. Do not use heavy metal as additives.
12. Due to the nature of the photolumienscent pigment, it can deposit after long time storage. Just stir it while using, the deposit will not effect the luminosity.
Did you enjoy this article? Click here to subscribe to the magazine.
Copyright © 2013 ST Media Group International. All Rights Reserved.