Any single measurement where the measurement of a specific component of the process is desired or a specific direct element such as caliper is needed. This can be either a single sensor or multiple sensors: The special sensors can be combined with other sensors to give a total picture of the manufacturing process:
- urea application to a base sheet (urea as a binder to a nonwoven sheet
- moisture content of a sheet
- Using beta sensor and near IR sensor ( basis weight, moisture content, bone dry fiber, binder)
- Laser caliper for roughness or with dual sided total thickness
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