The stencil, mesh and ink choices are vital to the success of high
density screen printing on textiles.
Films which vary from 100 to 1000 microns thick are desirable for this
application. A direct-indirect method is recommended to adhere the film to
the screen. Place the film on the screen, emulsion side up. Apply two
coats of emulsion to the squeegee side to adhere the film. Dry. Expose.
Wash out under low pressure.
Get recommendations from ink manufacturers on the proper mesh count to
use with their ink and your stencil configuration. Common mesh counts are
80s, 80ss, 70s, 86 and 110. Using S thread allows the ink to flow better
and release from the stencil throughout the press run. Overly thick
threads can block ink flow.
Ink must be suited to the task. If the image is large, improperly
chosen ink may dish from the edge of the image to the center. Consider a
multi-level image printed in several layers which are flash cured prior to
the next layer. The inks must flow properly through the mesh and stencil
thickness. Consult the ink manufacturer for recommendations.
Author: Bob Wellen
Source: SGIA Journal, Q2 2000, p. 39-42