HP Scitex LX850 HP Scitex LX850 & LX820 Printers: User's Guide - English - Page 68

Before creating a new preset

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Handle the substrate Creating a new preset has several purposes. ● You can assign a name of your own choice to a particular substrate. ● You can adjust the preset to suit the precise characteristics of your substrate. ● You can adjust the preset to your intended use of the substrate, which may range from highestquality printing to fast production output. NOTE: You can change only the presets that you have created yourself. The presets supplied by HP cannot be changed. Before creating a new preset, it is useful to understand a little about how the printer works. Here are some of the available settings. Table 3-1 Substrate preset settings Setting If too low If too high Number of passes The number of passes specifies how many times the printheads will print over the same area of substrate. The printer cannot deposit enough ink over a given area, so colors are muted. Because larger substrate advances are required and ink has to be placed faster on the substrate, the boundaries between passes are more visible and may be seen as horizontal lines across the image. However, printing speed is relatively high. Colors are vivid, print quality is high, and printhead health is well maintained. However, printing speed is relatively low. Curing temperature Curing is needed to coalesce the latex, creating a polymeric film which acts as a protective layer, while at the same time removing the remaining co-solvents from the print. Curing is vital to ensure the durability of the printed images. The print may emerge not fully dry, so that the ink smears when rubbed with a finger. The print may appear dry immediately after printing and then become wet to touch some seconds later. If the curing temperature is very low, the latex film is not created, in which durability is drastically reduced. The substrate may wrinkle on the platen, causing vertical banding or ink smears, with substrate jams in extreme cases. Fragile substrates may be damaged. Drying temperature The heat applied in the printing zone removes water and fixes the image to the substrate. Print quality defects such as bleeding and coalescence may occur. Boundaries between colors are not well defined. Single-color area fills are not uniform: ink is concentrated at the edges or in clusters within the area fill. Thermal marks may be seen on the substrate; they may appear as vertical bands in some colors. The substrate may wrinkle on the platen, causing vertical banding or ink smears, with substrate jams in extreme cases. Substrate tension Tension is applied at the input and the output side. It needs to be evenly distributed along the whole width of the substrate, thus substrate load is a critical operation. The substrate may be poorly wound onto the output roll, with sagging and skew, in which case it is likely to become increasingly wrinkled in the printing zone. Also, substrate advance could be irregular, resulting in horizontal bands. The substrate may be permanently deformed or damaged. TIP: Input tension should be higher than output tension. TIP: Output tension should be increased whenever vacuum pressure is increased. 64 Chapter 3 Handle the substrate ENWW

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Creating a new preset has several purposes.
●
You can assign a name of your own choice to a particular substrate.
●
You can adjust the preset to suit the precise characteristics of your substrate.
●
You can adjust the preset to your intended use of the substrate, which may range from highest-
quality printing to fast production output.
NOTE:
You can change only the presets that you have created yourself. The presets supplied by HP
cannot be changed.
Before creating a new preset, it is useful to understand a little about how the printer works. Here are
some of the available settings.
Table 3-1
Substrate preset settings
Setting
If too low
If too high
Number of passes
The number of passes specifies how
many times the printheads will print over
the same area of substrate.
The printer cannot deposit enough ink
over a given area, so colors are muted.
Because larger substrate advances are
required and ink has to be placed faster
on the substrate, the boundaries
between passes are more visible and
may be seen as horizontal lines across
the image. However, printing speed is
relatively high.
Colors are vivid, print quality is high,
and printhead health is well maintained.
However, printing speed is relatively
low.
Curing temperature
Curing is needed to coalesce the latex,
creating a polymeric film which acts as
a protective layer, while at the same
time removing the remaining co-solvents
from the print. Curing is vital to ensure
the durability of the printed images.
The print may emerge not fully dry, so
that the ink smears when rubbed with a
finger. The print may appear dry
immediately after printing and then
become wet to touch some seconds
later. If the curing temperature is very
low, the latex film is not created, in
which durability is drastically reduced.
The substrate may wrinkle on the platen,
causing vertical banding or ink smears,
with substrate jams in extreme cases.
Fragile substrates may be damaged.
Drying temperature
The heat applied in the printing zone
removes water and fixes the image to
the substrate.
Print quality defects such as bleeding
and coalescence may occur. Boundaries
between colors are not well defined.
Single-color area fills are not uniform:
ink is concentrated at the edges or in
clusters within the area fill.
Thermal marks may be seen on the
substrate; they may appear as vertical
bands in some colors. The substrate may
wrinkle on the platen, causing vertical
banding or ink smears, with substrate
jams in extreme cases.
Substrate tension
Tension is applied at the input and the
output side. It needs to be evenly
distributed along the whole width of the
substrate, thus substrate load is a critical
operation.
TIP:
Input tension should be higher
than output tension.
TIP:
Output tension should be
increased whenever vacuum pressure is
increased.
The substrate may be poorly wound onto
the output roll, with sagging and skew,
in which case it is likely to become
increasingly wrinkled in the printing
zone. Also, substrate advance could be
irregular, resulting in horizontal bands.
The substrate may be permanently
deformed or damaged.
64
Chapter 3
Handle the substrate
ENWW
Handle the substrate