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Many factors such as composition, size and form, angle, pressure, and
speed of the blade (squeegee) determine the quality of the impression made
by the squeegee. At one time most blades were made from rubber which,
however, is prone to wear and edge nicks and has a tendency to warp and
distort. While blades continue to be made from rubbers such as neoprene,
most are now made from polyurethane which can produce as many as 25,000
impressions without significant degradation of the image.
If the item was printed on a manual or automatic screen press the
printed product will be placed on a conveyor belt which carries the item
into the drying oven or through the UV curing system. Rotary screen
presses feed the material through the drying or curing system
automatically. Air drying of certain inks, though rare in the industry, is
still sometimes utilized.
The rate of screen printing production was once dictated by the drying
rate of the screen print inks. Do to improvements and innovations the
production rate has greatly increased. Some specific innovations which
affected the production rate and has also increased screen press
popularity include:
- Development of automatic presses versus hand operated presses which
have comparatively slow production times
- Improved drying systems which significantly improves production rate
- Development and improvement of U.V. curable ink technologies
- Development of the rotary screen press which allows continuous
operation of the press. This is one of the more recent technology
developments
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