PRESENSITIZED OFFSET PLATES of Italian company SAVERIO RIEF s.a.s
PRIMA
Electrochemically grained plate of anode - oxidized base and of
high quality reproduction, designed for printing medium and high
stocks of printing matter in sheet - fed and roll - fed printing
machines. Durability of the plate - around 150,000 prints, after
burning - around 600,000 prints. It is resistant to alcohol in dampening
solution.
Characterised by a hard anodic layer, has medium electrograining
and a photosensitive coating assuring perfect imaging of halftone
dots and a very good reproduction properties. The plate is biresinous,
which facilitates a wider range of exposures. Photosensitive blue
- green emulsion indicates a very bright change of colours of exposed
fields, assuring a sharp picture and a good contrast with unexposed
fields before developing / processing.
Unit package:
100 units
50 units
40 units
- plates of 0.15 and 0.20 mm thick.
- plates of 0.30 mm thick.
- plates of 0.30 mm thick, from format 770x1030 mm
Notice: It is possible to order plates of any format of the following thickness:
0.15 mm, 0.20 mm, 0.30 mm, and 0.40 mm.
Technical information on the process of development:
It is recommended to protect the plate from white light and to utilize it in a room with safe light. Plate must be halogen lamp exposed of the emission spectrum between 370 and 420 mm. To determine exposure time a halftone quoin should be used on UGRA OFFSET Testkeil 1982 test strip. With a 5,000 W lamp and distance of 100 cm from windowpane the exposure time is about 60 - 70 seconds. A perfect reproduction of 10 microstrips with a high 2% resolution will be obtained if the following values appear on the halftone quoin:
Grade 1 - 3
Grade 4 - 7
Grade 8 - 13
- perfectly clear
- gradual increase of surface density
- surface should be homogeneously uniform.
The plate may be developed manually or automatically. Average developer's temperature
should be 20 - 22 centigrade, conductivity 75 mS/cm. Time of manual
development is about 1 min. while in automatic processing it is around
30 s. Developer loses its efficiency in lower temperatures, in higher
it becomes more aggressive and may damage printing surfaces. To safeguard
the exposed and developed plate it must be gummed with an even, thin
layer of gumming agent.
PRESENSITIZED OFFSET PLATES of Spanish company LITHOPLATE S.A.
OPTIMA
Plate of special construction of 99.5% aluminium alloy AA 1050
H18. It undergoes electrochemical graining and anodic oxidation,
designed for printing medium and high printing stocks in sheet and
roll - fed printing machines of high quality reproduction. Resistance
of the plate is around 150,000 printouts, after burning 600,000
printouts.
Plate requires minimum dampening; it is resistant to alcohol in
dampening solution and does not undergo oxidizing while short standstills.
Photosensitive layer of very high sensitiveness, after being exposed,
characterized by a good contrast between light blue exposed field
and blue - violet unexposed field. After developing, excellent imaging
of halftone dots and high colour contrast in printing are achieved.
Unit package:
100 units
50 units
40 units
30 units
- plates of 0.15 and 0.20 mm thick.
- plates of 0.30 mm thick.
- plates of 0.30 mm thick, from format 770x1030 mm
- plates of 0.40 mm thick.
Notice: It is possible to order plates of any format in the following thickness:
0.15 mm, 0.20 mm, 0.30 mm, and 0.40 mm.
Technical information on the process of development:
Plate must be protected from white light; all works should be performed
by yellow light. Establishing exposure time should be started with
the value most often used, and then using UGRA OFFSET Testkeil 1982
test strip exposure time should be selected in such a way that the
following values appear on halftone quoin after development:
Grade 1 - 3
Grade 4 - 7
Grade 8 - 13
- perfectly clean
- gradual increases in surface density
- the surface should be homogeneously uniform.
To eliminate film corners, dissipative film may be applied but it is
not recommended for the proportion of dissipative light to exceed
50% of total light. Plate can be developed manually or automatically,
by means of any positive plate developer. Average developing temperature
should be between 20 - 24 centigrade, conductivity 35-70 mS/cm. Time
of manual development equals 1 minute while in automatic processes
around 30 seconds. Manual development requires high - quality developer
of moderately strong properties. Overexposure should be avoided as
it may weaken unexposed emulsion. After developing, the image must
retain the colour and lustre of new, not used plate. To protect exposed
and developed plate it must be gummed with even, thin layer of gumming
agent.
PRESENSITIZED OFFSET PLATES of Italian company PLURI METAL s.r.l.
MATRIX
Electrochemically grained and anodised positive plate, designed
for printing medium and high printing stocks in sheet and roll -
fed printing machines. Durability of the plate - around 150,000
copies. After burning it increases to around 500,000 printouts.
It is performed in temperature of 220 centigrade for about 5 min.
Matt layer of the plate facilitates fast and accurate obtaining
of vacuum before development, due to which the film perfectly adheres
to the whole surface. Photosensitive blue - green emulsion after
development shows a clear, blue image. After development the plate
perfectly images halftone dots, which assures a high printing quality.
It is resistant to isopropyllic alcohol in dampening solution.
Plates must be stored in dry room and protected against rapid changes
of temperature and humidity. Life of originally packed plates is
around 18 months.
Unit package:
100 units
50 units
40 units
30 units
- plates of 0.15 and 0.20 mm thick.
- plates of 0.30 mm thick.
- plates of 0.30 mm thick, from format 770x1030 mm
- plates of 0.40 mm thick.
Notice: It is possible to order plates of any format in the following thickness:
0.15 mm, 0.20 mm, 0.30 mm, and 0.40 mm.
Technical information on the process of development:
Works in photo preparatory room must be carried out by safe yellow
light. The plate is exposed to halogen lamp of emission spectrum
between 370 and 420. Correct exposure time must be chosen this way
that the microstrip field of UGRA OFFSET testkeil 1982 test strip
perfectly images resolution of 10 µm, and the following values
appear on halftone quoin:
Grade 1 - 3
Grade 4 - 7
Grade 8 - 13
- perfectly clean
- gradual increase in surface density
- the surface should be homogeneously uniform.
Film corners are eliminated by using dissipative film. The plate can be developed
manually or automatically, using any positive plate developer. Average
developer's temperature should be between 20 - 24 centigrade. In lower
temperatures developer loses its efficiency, in higher it becomes
more aggressive and may destroy printing surfaces. Time of manual
development is around 1 minute while in automatic processes it is
around 30 seconds. After development the image should retain colour
and lustre of a new not used plate. To protect exposed and developed
plate, it may be gummed with an even layer of gumming agent.