Support of the roll
With the 60º hexagonal cell the dot is supported by all the cell walls. For the LongCell the dot is only partially supported. When the exact same screen count is used, it might be possible that 30-60% less cells are available to support the dots. This depends upon the Cell angle.
For the 60º hexagonal cell the shape is standardised. For the LongCell this is not the case, each supplier uses its own size for LongCells resulting in a 60º, 70º, or 75º angle.
Note: Different repro is needed! The usual ratio between the screens of Anilox & Cliché is 1:3. A risk of moiré occurs when LongCell is used.
Characteristics of the cell shapes
|60 degree hexagonal cell||LongCell with a length of 80 L/cm|
* If the cliché is 70 l/cm, or higher, moiré could occur. For a anilox screen of 200 l/cm with a 35 l/cm cliché no problems occur.