When doing the heat transfer printing, Transfer lines appear as faint lines in the fabric that correspond to where the edges of the transfer sheet were located during pressing. They are caused by the shirt fibers melting along the edges of the transfer sheet. If you are an embroiderer, transfer lines look kind of like hoop marks, except they are permanent.
Your first option for preventing transfer lines on apparel is to experiment with your heat press settings. Consider reducing the temperature to 390˚F and reducing the pressure to a very light setting. You also may cut back the pressing time from 60 seconds to about 45 seconds. Changes should be made gradually, as too much variance from the standard settings could affect image quality.
Another simple option is to tear away the excess heat transfer paper that is not coated with sublimation dye. This will soften the paper’s edges and greatly reduce the potential occurrence of transfer lines.
Many sublimators use a process that incorporates a sheet of high-temperature foam during production to prevent lines from forming. One important thing to remember with apparel is that different garments may need different settings. Regardless of which approach you use, document your settings for future reference.
These are some of the most common issues encountered by sublimators, and each of them is relatively easy to resolve. If you are still having trouble, contact your equipment supplier. Don’t let production challenges slow you down or intimidate you. Most issues can be resolved.
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