W&H stack printing press
|Machine||W&H stack printing press|
|CI or stack||Stack|
|Number of colors||6+1|
|Max. web width||1620 mm|
|Max. printing width||1600 mm|
|Min. – Max. printing repeat||450 - 1200 mm|
|Max. mechanical speed||300 m/min|
|Max. unwind reel diameter||1000 mm|
|Max. rewind reel diameter||1000 mm|
|Drying type||Thermic oil|
|Video camera||Working mirror system
Camera Eltromat which needs repair
|Number of aniloxes||14 (see list)|
|Number of printing cylinders||see list|
|Number of gears||see list|
|Including||5 UV lamps for drying who need repair|
W&H, Windmöller & Hölscher
The W&H Group produces extruders, printing presses en converting machines. For more than 140 years W&H has been manufacturing converters for flexible packaging. They have sold over 5000 machines in more than 140 countries. This German based company has its plant in Lengerich.
Flexo printing presses
The first printing press was introduced in 1440. Those presses were used for printing paper and books. There have been a lot of improvements, especially during the industrial revolution when the first industrial printing press was designed. In 1890 the first flexo printer was invented in Liverpool, England.
Flexography, or flexo, is named after the flexible relief plate that is used to print. Flexo printing presses can be used for plastic, film, cellophane and paper. Flexo machines are the most common machines in food packaging. In 1952 the official name for this type of printing was announced: Flexographic process or short, flexography.
Last decades there were also a lot of improvements, especially in the digital printing field and the amounts of colors that a press can use. There are several types of flexo printing presses: CI presses, stack presses and in-line printing presses. CI stands for Central Impression. Those flexo printing presses have an impression cylinder. Stack presses are used for multi color printing. It is called stack because each color station is stacked vertically. Stack presses have two to eight seperate color stations, sometimes they have two parallel stacks of printing units. The third type of printing presses, the in-line presses, have seperate, horizontal color stations from front to back.
- Printing press