encre transférée vient uniquement du bord des alvéoles. Nous pouvons expliquer cette forme des impressions par la forte viscosité de l'encre ,
encre relativement visqueuse est « tirée » par les zones les plus hautes de la forme imprimante, à savoir les ponts de trame. L'orientation et les mesures du dépôt d'encre en forme de « grillage », montrent que nous avons bien une reproduction des cellules du cylindre hélio. Nous allons mesurer l'épaisseur moyenne des dépôts d'encre sur les deux supports ,
9-25) présente un profil de hauteur d'une impression réalisée sur le papier 6 avec de l'encre Xink. Le profil suit un segment représenté en rouge sur la photographie de la figure ,
9-26) nous pouvons voir que le chemin d'analyse est approximativement parallèle à la base du motif Sur la figure (9-27) nous pouvons mesurer la distance entre les deux pics : soit environ 137 µm ,
Nous avons donc imprimé les encres modifiées par ajout d'éthanol. Il faut trouver un compromis entre la diminution de la viscosité et celle de la tension superficielle pour obtenir de bonnes caractéristiques pour nos encres. Une tension superficielle inférieure à 40 mN ,
Elle est respectivement de 46 mPa.s, 38 mPa.s et 31 mPa Nous sommes proches des valeurs limites de viscosité des encres employées en héliogravure. Nous avons donc imprimé la solution de Baytron P HS contenant 30% en masse d'éthanol sur du PET, pp.9-28 ,
l'orientation des canaux formés par le polymère (partie claire) est dans le sens marche ,
l'impression est de meilleure qualité. La microporosité du papier jet d'encre permet la formation d'une couche plus homogène ,
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