Paper making and fiber liberation – Processes and products – Including solid non-waterlaid preform
Patent
1981-06-03
1984-03-20
Chin, Peter
Paper making and fiber liberation
Processes and products
Including solid non-waterlaid preform
162105, 162108, 162140, D21D 300, D21H 510
Patent
active
044379358
ABSTRACT:
A security device is integrally combined with the fibres of the paper in a paper-making process. A carrier web of water-dispersible fibres carrying the security element is brought into contact with the paper stock during the paper-making process. The carrier web becomes rapidly dispersed upon contact with the wet stock leaving the security element firmly attached to the paper fibres in the stock. In one embodiment, the security element comprises a plastic diffraction grating structure. In a further embodiment, the carrier web comprises an open porous structure for enhancing intermixing with the paper stock.
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Dobrowolski et al., "Optical Interference Coatings for Inhibiting of Counterfeiting", Optica Acta vol. 20, No. 2, 12/73.
Chin Peter
Crane and Company
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