Selective heat-transfer imaging system and method of using...

B - Operations – Transporting – 41 – M

Patent

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B41M 5/025 (2006.01) B41M 5/035 (2006.01) B41M 5/50 (2006.01) B44C 1/17 (2006.01) C09D 11/00 (2006.01) B41M 5/52 (2006.01)

Patent

CA 2694221

A heat-transfer imaging system (10) and a method of using the same. The heat- transfer imaging system (10) includes a heat-transfer sheet (11) and an activating ink (12). The heat-transfer sheet (11) and the activating ink (12) are specially formulated so that only the areas of the heat- transfer sheet onto which the ink has been printed become adhesive under heat-transfer conditions. This effect may be achieved by designing the sheet to include an ink-receptive coating (25) whose melting temperature is higher than that typically encountered during normal heat-transfer conditions and by formulating the activating ink (12) to include a plasticizer that, when printed onto the ink-receptive coating (25), lowers the melting temperature of the ink-receptive coating sufficiently so that the modified melting temperature falls within the temperature range encountered during heat-transfer.

L'invention concerne un système de formation d'image par transfert de chaleur (10) et son procédé d'utilisation. Le système de formation d'image par transfert de chaleur (10) comprend une feuille de transfert de chaleur (11) et une encre d'activation (12). La feuille de transfert de chaleur (11) et l'encre d'activation (12) sont spécialement formulées de telle sorte que seules les zones de la feuille de transfert de chaleur sur lesquelles l'encre a été imprimée deviennent adhésives dans des conditions de transfert de chaleur. On obtient cet effet en concevant la feuille de façon qu'elle comprenne un revêtement de réception d'encre (25) dont la température de fusion est supérieure à celle habituellement rencontrée pendant des conditions de transfert de chaleur normales, et en formulant l'encre d'activation (12) de façon qu'elle contienne un plastifiant qui, lorsque l'encre est imprimée sur le revêtement de réception d'encre (25), abaisse suffisamment la température de fusion du revêtement de réception d'encre pour que la température de fusion modifiée tombe à l'intérieur de la plage de température atteinte pendant le transfert de chaleur.

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