WILFLEX™ Epic Polywhite LC is the best-in-class low-bleed white with the highest opacity rating in the Wilflex white's portfolio. Printers easily achieve a full ink deposit and excellent coverage when using Polywhite LC. This ink gives excellent bleed protection at all cure conditions, especially at low cure temperatures.
- High opacity, superior coverage, brilliant white
- Superior bleed resistance at a wide temperature range
- Good stretch
- Stir inks before printing.
- Use consistent, high-tensioned screen mesh and sharp-edged squeegees for the best print results.
- Use a printing technique to assure a good ink deposit to maximize bleed resistance and film strength properties.
- Polywhite LC is a full-bodied ink. For manual or automatic printing, do a hard flood stroke to prefill the stencil and use medium squeegee pressures with a moderate to fast print stroke for the best print performance. This will improve fiber matte and ink opacity.
- Polywhite LC is a low-bleed ink. For challenging fabrics using sublimation dyes, a bleed-blocking underbase is required.
Adjust flash cure temperature and dwell time so the ink is just dry to the touch. Depending on the flash unit, a 2 -3 second flash is adequate.
Curing is a time and temperature process, a lower oven temperature setting with a slower belt speed while maintaining recommended ink cure temperature is always best to protect fabric, control dye migration, and reduce energy consumption.
Polywhite LC can be cured* between 270°F - 320°F (138°C - 160°C). Running at the higher end of the temperature range and/or longer dwell times in a conveyor may be required to achieve proper cure on jobs that contain cotton, high ink deposits, or heavy-weight garments.
*Cure is attained when the ENTIRE ink layer reaches 300°F, meaning that the ink is 300°F from the top to the bottom of the ink layer. If you are using a laser gun to read the surface temp, this WILL be misleading. Laser temp guns give you a reflective reading. When tested side-by-side with a donut probe, you will see temperature differences as great as 120°F-150°F early in the cure cycle (the donut probe accurately measures the contact temperature where the crosshairs reside). As you reach the end of the dryer, those temperatures will get closer together. As a direct result – you will need to read a surface temp as little as 60°F above what the stated cure temp is and as much as 100°F depending on how short the conveyor dryer tunnel is and how hot the settings are. This is due to a few variables.
VARIABLES THAT AFFECT CURE TIMES
The rate at that plastisol ink absorbs heat. Some colors, like black ink, will heat up faster than others as they absorb infrared heat waves more readily.
How hot the ink is when entering the tunnel of the conveyor dryer. Cooler inks will take longer to heat up, thus taking longer to reach full cure.
The thickness of the ink deposit. Thicker ink deposits take longer to cure than thinner ink deposits. A longer dwell time is needed to reach a full cure through the whole ink layer. Heat/IR waves take time to penetrate and heat up the ink.
The length of the tunnel of the conveyor. Curing ink is about temperature and time. It takes time for the entire ink layer to heat up and reach cure temp. Run a conveyor at a slower pace and at lower temperature to ensure the heat penetrates the bottom of the ink layer.
Poly-blended garments containing cotton will take longer to heat up compared to 100% polyester. Cotton naturally soaks up and holds onto water. When putting the shirt through the dryer, the dryer will release the water in the cotton fibers, slowing down how fast ink heats up.
The quality of the infrared panels. IR Panels are not created equal. Some panels are more efficient in creating heat within the ink layer than others. When changing the dryer to low cure temperatures, follow the recommendations and parameters laid out above and do wash testing to ensure the new dryer settings are reaching a full cure.
Store at temperatures around 65-90°F (18-32°C). Avoid direct sunlight. Use within one year of receipt.
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