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Most of the time it's off-contact. Shops set it too high and don't use enough pressure, so ink builds up on the back of the screen and double-images. Wipe the back clean with Easiway 842, set off-contact to about a stack of one or two quarters, and check your squeegee blade and pressure.
Bleeding and fuzzy edges have a lot to do with off-contact. Most customers set their off-contact too high and don't use enough pressure. When the screen releases, they're still holding the mesh down close to the garment, and the ink double-images on the back of the screen. That ink outside the print area on the back of the screen is what causes the blurry image.
When that happens, wipe off the back of the screen with Easiway PlastiSolv 842. Get it nice and clean, make sure it's dry, then go back to printing.
The rule of thumb: set your off-contact about the height of a stack of one to two quarters above the garment. A U.S. quarter is about 1.75 mm thick, so that's roughly 1/16" to 1/8".
Usually off-contact set too high with not enough pressure. Ink double-images on the back of the screen and blurs the next print. A rounded squeegee blade and too much pressure can do it too.
About the height of a stack of one to two quarters above the garment, roughly 1/16" to 1/8".
Wipe it with Easiway PlastiSolv 842 until it is clean, let it dry, then keep printing.
They play a smaller part than off-contact, squeegee and pressure. Ink viscosity matters more.
Related: How to screen print · Screen printing squeegees · Mesh count chart · Easiway · Wilflex ink
