Printing – Embossing or penetrating – Processes
Patent
1993-02-23
1994-08-23
Burr, Edgar S.
Printing
Embossing or penetrating
Processes
101 23, 156209, B31F 107
Patent
active
053397304
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a method for printing-embossing paper sheets of cellulose wadding (tissue paper) having two or more plies.
Cellulose wadding products comprising two or more plies are used, in particular, as sanitary paper or general-purpose towels.
The conventional printing procedure for two-ply cellulose wadding of the tip-to-tip type consists in printing the product on its outside by a printing system upstream or downstream of the embossing system.
The major drawback of such a procedure, illustratively found in U.S. Pat. No. 3,414,459, is that the printing ink is located on the product's outside and hence will be in contact with the outside when in use. Moreover, it is impossible to synchronize embossing and printing. Lastly, when printing before embossing, the former interacts with the latter and degraded definition is incurred.
Conventional printing-embossing of two-ply cellulose wadding products of the nested type consists in using the glue-sizing system of the embossing set and in dyeing the glue.
This technique is described for instance in U.S. Pat. No. 3,867,225 and results in products free from printing ink on its outsides, but still subject to many drawbacks, in particular, the dependency of the printing pattern on the embossing pattern (it cannot be easily changed therefore), the dependency of the printing denseness on gluing, and the high capital costs. Moreover, the ink must be miscible with the glue and hence the choice of inks is restricted.
Again, the range of fineness of conventional printing, such as screens or vignettes, is precluded.
The present invention precludes the above drawbacks and offers a printing-embossing method for cellulose wadding papers having two or more plies, and is characterized in that one ply is directly printed on the embossing roller using one or more printing systems mounted on the embossing systems, and in that this ply is associated with another embossed ply and is glue-sized in a manner known per se to form a sheet in such a manner that the printing pigments shall be located on the inner side of the sheet between the two or more plies.
The method of the invention applies as well to tip-to-tip embossing as to nested embossing.
The invention shall be presently described in relation to the attached and illustrative drawings.
FIG. 1 is a schematic view of equipment with which to carry out a method of the invention for nested printing-embossing of the tip-to-tip type.
FIG. 2 is a schematic view of equipment for carrying out the method of the invention of the nested printing-embossing type.
With respect to FIG. 1, a tissue ply 1 moves in the direction shown by the arrow and passes round a rubber compression roller 2 into the nip 3 formed between the rubber compression roller 2 and steel embossing roller 4. The tissue ply 1, embossed in the nip 3 and moving round the steel roller 4, is sized by gluing system 5 and moves toward nip 6.
A second tissue ply 7 moves in the direction of the arrow and passes over guide rollers 8 and 9 and then round the rubber compression roller 10 into the nip 11 between the rubber compression roller 10 and the steel embossing roller 12. The tissue ply 7 embossed in the nip 11 moves round the embossing roller 12 and is printed while on the embossing roller 12 in the printing systems 13 and 14. The embossed and printed tissue ply 7 moves toward the nip 6 where it is combined in tip-to-tip manner with the sized and embossed tissue ply 1 to form a sheet 15.
By means of the guide roller 16, the sheet 15 is moved to a subsequent and conventional conversion stage.
The print pigments of the sheet 15 are located on the inner side between the plies 1 and 7.
As regards FIG. 2, a tissue ply 101 moves in the direction shown by the arrow and passes round a rubber compression roller 102 into the nip 103 formed between the compression roller 102 and the steel embossing roller 104. The tissue ply 101, embossed in the nip 103 and passing round the embossing roller 104, is sized according to 405 at the gluing system 105. The gluing system 105
REFERENCES:
patent: 2746387 (1956-05-01), Neumann
patent: 3403621 (1968-10-01), Simson et al.
patent: 3414459 (1968-12-01), Wells
patent: 3867225 (1975-02-01), Nystrand
patent: 4135962 (1979-01-01), Sinclair et al.
Hungler Joel
Laurent Pierre
Ruppel Remy
Bennett Christopher A.
Burr Edgar S.
Kaysersberg
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