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.

© 2007 Grafmaj