Recording paper that can be printed on the reverse
Recording paper includes a stock sizing and/or surface preparation, a front side for receiving recordings and a reverse side configured differently from the front. The reverse exhibits excellent printability coupled with improved drying of printing inks when using offset printing inks that contain functional pigments and in particular magnetizable particles, while preventing the printable ink and the functional pigments, in particular the magnetizable particles, from penetrating too deeply into the paper.
1. Recording paper with internal sizing and a reverse-side surface preparation, whose front side is intended for receiving recordings, and whose reverse side has a different structure from the front side and can be printed with a printing ink that contains functional pigments, wherein the reverse side of the recording paper has an additional surface preparation, which is applied by means of one of an aqueous solution that contains one of dimeric alkyltene, styrene-maleic anhydride copolymer, starch, polyvinyl alcohol, alginate, and carbomethyl cellulose (CDM), and a dispersion of a synthetic binder, and wherein the reverse side has a Cobb 60 value X such that 15 g/m 2 ≦X≦25 g/m 2 and a mean Bekk smoothness Y such that Y ≦200 s.
2. Recording paper in accordance with claim 1 wherein the reverse side has a Cobb 60 value X such that X≦23 g/m 2 .
3. Recording paper in accordance with claim 1 wherein the reverse side has a mean Bekk smoothness Y such that Y≧160 s.
4. Recording paper in accordance with claim 1 wherein the reverse side has a mean Bekk smoothness Y such that Y≧175 s.
5. Recording paper in accordance with claim 1 wherein the additional surface preparation is pigmented.
6. Recording paper in accordance with claim 1 wherein the front side of the recording paper has a heat-sensitive recording coating that contains dye precursors and acceptors that react with one another under the influence of heat.
7. Recording paper in accordance with claim 1 wherein the front side of the recording paper can be printed by the ink-jet printing process.
8. Recording paper in accordance with claim 1 wherein the front side of the recording paper has an ink-reception coating for the ink-jet printing process.
9. Recording paper in accordance with claim 1 wherein the reverse side of the recording paper is printed with a printing ink that contains functional pigments.
10. Recording paper in accordance with claim 9 wherein the reverse side of the recording paper is printed with a printing ink that contains up to 70 wt % of functional pigments.
11. Recording paper in accordance with claim 1 wherein the reverse side of the recording papers is printed with a printing ink whose functional pigments can be magnetized.
12. Recording paper in accordance with claim 1 wherein the reverse side of the recording paper is printed with a printing ink whose functional pigments comprise at least one of iron powder and iron oxide.
13. Recording paper in accordance with claim 1 wherein the printing ink can be crosslinked by UV radiation.
14. Recording papers in accordance with claim 1 further comprising at least one additional imprinted coating covering the printing ink and rendering it barely visible to the naked eye.