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Dry and wet laminating station
In order to combine the properties of different materials, several laminating processes can be used when upgrading web-like materials.
Laminating creates a permanent connection of two materials by pressing them with rollers (exception: transfer laminations, e.g. labels).
For technical reasons, there are differences in working width and the required pressing force. Laminating units are divided into two- and three-roller units to compensate for these differences.
- two-roller laminating unit for normal laminating tasks
- three-roller laminating unit with small rubber laminating roller for high line pressing
Depending on the space conditions and the process requirements, the laminating units can be installed vertically or horizontally.
Laminating processes are divided into wet and dry laminating methods. The difference lies in the moment of drying.
In both procedures, first the adhesive is applied by rollers. In wet laminating, the lamination process is done directly after coating and the compound is dried then. Another version is dry lamination. Here the adhesive is applied and dried before lamination.
Variants of these laminating processes are laminating with wax and with molten adhesives.
The processes are also influenced by
- the diameter of the laminating roller
- the temperature control of the laminating rollers (heated usually by water or thermal oil)
- the hardness of the rubber laminating roller
- the possibility to swivel the rubber laminating roller around the steel laminating roller
- a variable laminating pressure control
- the torque or web tension control of the rollers
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