In logo printing, screen printing is a key step in making screen printing plates. Its purpose
is to accurately transfer the designed logo pattern to the printing material. The following
are the specific functions and processes of screen printing:
Function
Forming a pattern template: The process of screen printing is to create a pattern template
on the screen that matches the logo design exactly. By processing the screen, the mesh
holes in the pattern part can allow ink to pass through, while the mesh holes in the
non-pattern part are blocked, so that the pattern can be accurately reproduced during
printing.
Control ink transfer: The size and shape of the mesh holes on the screen determine the
amount and accuracy of ink transfer. A suitable screen can ensure that the ink passes
through the mesh holes evenly and is printed on the substrate with appropriate thickness
and clarity, thus presenting a clear and full logo pattern.
Process
Prepare the screen: Select a suitable screen. The mesh count and material of the screen
are usually determined according to the printing requirements and the characteristics of
the substrate. Common screen materials include nylon, polyester and stainless steel.
Then stretch the screen tightly on the screen frame to ensure uniform screen tension.
Coating photosensitive glue: evenly coat a layer of photosensitive glue on the screen.
Photosensitive glue is a light-sensitive material that will react chemically after exposure to
form a colloid with a certain hardness and water resistance.
Exposure: Place the designed logo pattern negative (usually film) on the screen coated
with photosensitive glue, and then expose it through a UV light source. During the
exposure process, the light transmitted through the transparent part of the negative will
cause the photosensitive glue to undergo photopolymerization, while the photosensitive
glue corresponding to the black (light-shielding) part of the negative will not react.
Development: After the exposure is completed, rinse the screen with clean water. The
photosensitive glue in the unexposed part will be dissolved and washed away, forming a
hollow part on the screen that is consistent with the logo pattern. These hollow parts are
the channels through which the ink will pass.
Drying and curing: Dry the developed screen to completely cure the photosensitive glue,
improve the wear resistance and water resistance of the screen, so that it can withstand
the pressure of the ink and the scraping of the scraper during the printing process, and
ensure the stability and clarity of the pattern.
After the above steps of opening the screen, you will get a screen that can be used for
logo printing. When printing, pour the ink on the screen, and through the extrusion of the
scraper, the ink is transferred to the substrate through the pattern on the screen, thus
completing the printing of the logo