304 Medium Grain Polyester Powder is a polyester based hot melt powder adhesives used to improve the adhesion of plastisol based heat transfers.
60 to 200 microns particle size
After printing the wet ink on transfer paper the powder adhesive can be applied by several methods:
- Sprinkle powder adhesive on wet ink using a salt type shaker.
- Fill a square container (box) with the powder adhesive, at least 1/4” to 1/2" deep, and pass the printed and wet transfer (print side up) through the container of powder adhesive. The powder adhesive will adhere to the wet ink.
- Use a special mechanical powder adhesive coater. When applying the powder adhesive by hand, remove excess powder adhesive from unprinted areas of the transfer sheet before running through the dryer by shaking or by slightly thumping/beating the transfer paper from the non-printed side of the transfer paper with fingers. Run the transfer paper with the powder adhesive applied to the wet ink through the dryer.
Time and temperature through the dryer may vary to some degree depending on the type of dryer used and the length of the heat tunnel. The powder adhesive will melt at 300°F to 325°F (149°C to 163°C). The powder adhesive should just be slightly melted (look like melted sugar) on the transfer paper if the adhesive has reached the prescribed temperature. Test dryer temperatures and wash test printed product before and during a production run. Always test for proper fusing.
When printing a multi-color transfer it is highly recommended that the last ink printed (color or clear) overlaps all the other colors that were previously printed so the powder adhesive can be applied one time to the last color applied. This method will give the best results in terms of adhesive coverage.
Finished transfers (ink and powder adhesive) should be applied at 325°F (163°C) for 5 to 15 seconds depending on the fabric and wash durability needed.