Security Device Integration in Wet-Stage Paper Manufacturing

The patent applies preliminary action by forming soft-edged through-holes in the fibrous web before introducing the security device during the wet stage. This pre-formed structure prevents fiber displacement when the security device is added, as the through-holes provide a predefined space that accommodates the security device without disrupting the fiber matrix. The through-holes are created using a patterned forming wire that removes fibers in specific patterns, establishing a framework that maintains sheet integrity while allowing security device integration.

The patent applies dimensionality change by transitioning from surface-level application to volumetric integration. By introducing security devices during the wet stage when the fibrous web is still forming, the security devices become embedded within the three-dimensional structure of the sheet material rather than being applied only to the surface. This allows thicker security devices to be incorporated without creating excessive caliper differential, as the security devices are distributed throughout the sheet thickness during the forming process.

The patent applies preliminary action by incorporating the security device into the fibrous web during the wet stage of paper manufacturing, before the sheet is fully formed and dried. This timing allows the security device to be integrated into the sheet structure when the fibers are still pliable and can accommodate the security device's thickness. By this stage, the sheet has sufficient structural integrity to handle thicker security devices without creating problematic caliper differential that would affect downstream processing such as winding, sheeting, stacking, and cutting.

The patent applies preliminary action by forming soft-edged through-holes before introducing the security device. This pre-formed structure creates designated spaces that guide fiber distribution around the security device. The through-holes ensure that fibers are not randomly displaced but rather redistributed in a controlled manner, maintaining adequate fiber concentration in sub-regions and hinge areas. The soft edges of the through-holes, created by the patterned forming wire, allow fibers to gradually transition around the opening rather than being abruptly displaced, preserving connective interaction while achieving proper integration.