Javier Martinez
New member
First of all sorry about my english.
This catalog were printed with conventional inks. The cover is an uncoated board (Bristol) with BOPP thermal lamination film and over the lamination some spot UV gloss coating.
Apparently the client store the catalogs in closed corrugated boxes but exposed to high temperatures. 3 months later when the client oppen de boxes the catalogs have some yellow stains.
My first impression was that there were some uncured coating that turns to yellow with as time passes.
Then I exposed one catalog to direct sunlight for about 4 hours an the yellow stains dissapear….
I don´t know what happend? Maybe a component of the fountain solution turns yellow? The lamination film adhesive?
Why this stains dissappear when exposed to sunlight?
I really hope somebody can give me some clues?
Javier Martínez
EPI Training
Mexico City
This catalog were printed with conventional inks. The cover is an uncoated board (Bristol) with BOPP thermal lamination film and over the lamination some spot UV gloss coating.
Apparently the client store the catalogs in closed corrugated boxes but exposed to high temperatures. 3 months later when the client oppen de boxes the catalogs have some yellow stains.
My first impression was that there were some uncured coating that turns to yellow with as time passes.
Then I exposed one catalog to direct sunlight for about 4 hours an the yellow stains dissapear….
I don´t know what happend? Maybe a component of the fountain solution turns yellow? The lamination film adhesive?
Why this stains dissappear when exposed to sunlight?
I really hope somebody can give me some clues?
Javier Martínez
EPI Training
Mexico City