Positive PS Plate

Techinal Specification of Offset Printing Plate

Plate Type : positive
Substrate  : aluminum
Gauge Available   : 1.5MM-3.0MM

Alloy aluminum alloy  : 1050H18

Handling  : against moisture ,against heat, shady
Light Source and Exposure : 140-200mj/m2

(1)2000W lamp with gallium lodide (80-100 seconds );

(2)3000w lamp with gallium lodide (40-60 seconds);

(3) 5000w lamp with gallium lodide 20-40 seconds .
Developer : develop solution or powder of positive ps plate can be used in developing

Dot reproduction ability  : 2-98%
Definition : 8-10 um
Density of plate substrate background color:less than or equal to 0.01

The mass per unite area of sensitive layer: 2.0-2.5 g/m2
The mass per unit area of oxide layer : 2.0-3.5 g/m2

Developing Temperature : 23degrees centigrade+/-2degrees centigrade

Developing Time :30-60seconds

Deletion: in order to eliminate the unnecessary image  and spot in the plate after washing with developer, a little plate modification prescription (for eliminating images) can be coated on the elimination place, keep it for one minute, then wash it with water and coat it with gum.

Shelf time: 18 month

Length of Run : 50,000impressions

Process : exposure, develop, plate modification, gumming, roast plate, printing