Sanitary article including ink used to increase the hydrophobicity of an area of the article
Sanitary articles such as sanitary napkins including several layers, wherein an ink is applied on at least one of the layers. The ink application area is situated at least partially above the core and extends outwardly across at least a portion of the periphery of the core, but does not entirely cover the core. The ink is visible in the finished article. The ink provides improved resistance to re-wet of the topsheet and side leakage of the core.
1. An absorbent sanitary article made of several layers, said layers including:
a liquid pervious topsheet;
a backsheet at least partially peripherally joined to said topsheet;
an absorbent core disposed between said topsheet and said backsheet, said absorbent core having a periphery; and
ink disposed on at least one ink application area of a body-facing surface of one of the layers of the article such that the hydrophobicity of the ink application area is increased, wherein the ink application area is partially above the core and extends outwardly across at least a portion of the periphery of the core, but wherein the ink application area does not entirely cover the core, and
wherein the ink application area is at least partially visible in the finished article.
2. An article according to claim 1 wherein the core has two longitudinal side-edges and wherein the ink application area extends substantially along the whole length of said longitudinal side edges.
3. An article according to claim 2 , wherein the width of the ink application area ranges between about 0.4 cm and about 3 cm.
4. An article according to claim 1 , wherein the core has two transversal side edges and wherein the ink application area extends substantially along the whole length of the transversal side edges.
5. An article according to claim 1 , wherein the article includes a secondary topsheet disposed between the absorbent core and the topsheet, and wherein the ink application area is at least partially disposed on the secondary topsheet.
6. An article according to claim 1 , wherein the ink is solvent-based.
7. An article according to claim 1 , wherein the ink application area is hydrophobic such that a drop of water deposited on the ink will form an angle α of at least 60°.
8. An article according to claim 1 , wherein the article has a longitudinal center line and wherein the length of said article along the longitudinal center line is between about 10 cm and about 25 cm.
9. An article according to claim 1 , wherein the article has two longitudinal side edges, and wherein the ink application area extends to said longitudinal side edges.
10. An article according to claim 1 , wherein the article is embossed.
11. An article to claim 1 , wherein the ink is applied generally homogeneously over the ink application area.
12. An article according to claim 1 wherein the ink is applied heterogeneously over the ink application area.
13. An article according to claim 12 wherein the article has a longitudinal centerline and wherein the gradient of hydrophobicity on the ink application area generally decreases towards the longitudinal center line of the article.
14. An article according to claim 12 wherein the article is embossed and the embossment generally covers the ink application area.