Huacai brand CTCP plate
High-quality AL plate for special purpose, Multi-layer ultra
fine-grain, even coating.It has advantages of high speed, excellent
dot reproduction, wide latitude of development and exposure, quick
inking. It is available for printing on newspaper printing and
superior color printing.
Recommended exposure unit: 20~30
Suitable printing speed: over 75,000 iph
Substrate: 1050H18 aluminum, electrochemically grained and anodized
Gauge: 0.15&0.25&0.30 mm
Safe Light: Yellow lamp
Light source: lodine-gallium lamp is used as the exposure light
source. Exposure time is depended on light source, the recommended
exposure in the table is only a given range.We suggest that you
should replace the light tube when the exposure time is 20% longer
than normal exposure time.
Light source: 3KW lodine-Gallium lamp, distance 1m
Film: To ensure the high exposure quality, it is suggested that the
density of the film should be >3.5oC when exposing the plate with the film.
Exposure time: Put the 21 step-gray scale (0.15 step difference) or
UGRA PCW82 control strip at the bottom of the film and the edge of
the plate, select the correct exposure and developing according to
the recommended condition. The optimum exposure of positive plate
can be obtained when the third step of gray scale is clear after
exposure and development, and the optimum exposure of negative
plate can be obtained when the ninth step of gray scale is clear
after exposure and development, or when the 15-20um line appears on
the control strip.
Preparation of developing solution: Hua Rui PD developer
Developing temperature: 23oC+2oC, if temperature is too high, it will influence dot reproduction
and press life, if the temperature is too low, it cant develop
Developing time: Less than one minute.
To remove unnecessary image or stains after developing, apply a
brush with a little erasing solution to the image area, let remover
stay less than 4 seconds, then rinse thoroughly with water. If
remover stays there for a longer time or rinse is not thorough, the
plate will be contaminated.
Gum the plate surface evenly to form a protection layer after
developing and rinsing. The concentration and the volume follow the
manufacturers recommendation. Higher concentration or excessive
volume of gum solution will influence the printing quality.
Baking solution: high-grade baking solution is a necessary option..
Baking time: 5~10 minutes. Baking temperature:220~240oC.
Baking conditions are strictly recommended above, shorter baking
time or lower baking temperature can not reach the baking results.
Longer time or higher temperature will influence the printing
quality. Baking result can not be evaluated only by the color
changed on the PS plate.
Storage and unpacking
Coating layer can be changed chemically by light and heat, so the
storage conditions are recommended as follows:
Temperature at 10~30oC and humidity <; 65%
Unpack it under yellow light. It is suggested that the plate-making
room avoid natural light.All light should be yellow light except
for exposure light.
Plates should be handled carefully to prevent from collision, heavy
pressing and knock. The height of stacked plates should be less
than 1.5 meters.
18 months for positive plates