B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 13/08 (2006.01) B41C 1/10 (2006.01)
Patent
CA 2130631
Various processes for enhancing the contrast between image and non-image regions of a printed image are implemented by increasing the toner-accepting charge on the surface of a printing form having a ferroelectric layer and from which the image is printed. The increase in charge is achieved, in alternate forms of the inventive process, either by increasing the temperature of the printing form surface relative to the temperature at which the form has been polarized, or by mechanically loading the printing form carrying cylinder for transfer of the toner from the printing form, or by applying additional charge carriers to the entire surface of the printing form (30) so as to create an enhanced potential difference between positively-polarized regions and negatively-polarized regions and, thereby, increased contrast between image and non-image regions.
Procédés divers permettant d'améliorer le contraste entre les zones d'image et les zones de fond d'une image imprimée, en augmentant la charge réceptrice de toner sur la surface d'une forme ayant une couche ferroélectrique à partir de laquelle l'image est imprimée. L'accroissement de la charge est obtenu, dans d'autres versions, soit en augmentant la température de la surface de la forme par rapport à celle de la polarisation de la forme, soit en chargeant mécaniquement le cylindre porteur de forme pour le transfert du toner de la forme, soit en appliquant des porteurs de charge additionnels sur toute la surface de la forme (30) afin de créer une différence de potentiel entre des zones polarisées positivement et des zones polarisées négativement, de manière à accroître le contraste entre les zones d'image et les zones de fond.
Man Roland Druckmaschinen Ag
Ridout & Maybee Llp
LandOfFree
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