Installation and process for recycling wiping solution of one or more intaglio printing presses

Patent metadata

Field	Value
Publication number	US-10603896-B2
Application number	US-201715642264-A
Country	US
Kind code	B2
Filing date	Jul 5, 2017
Priority date	Mar 5, 2010
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

There is described an installation (01; 02) for recycling wiping solution of one or more intaglio printing presses (10) comprising a flocculation tank (12) for inducing flocculation of ink constituents contained in waste solution coming from the one or more intaglio printing presses (10), a processing tank (14) for pre-treating the waste solution for subsequent filtering, and a filtering unit (15), preferably a filter press unit, for filtering the waste solution coming from the processing tank (14) and producing recycled solution at an output of the filtering unit (15), which recycled solution is recycled to produce fresh wiping solution for use by the one or more intaglio printing presses (10). According to one embodiment, the installation (01) further comprises a centrifugation unit (13) for separating the waste solution coming from the flocculation tank (12) by centrifugation into precipitate and centrifuged supernatant, which centrifuged supernatant is fed to the processing tank (14). According to a second embodiment, the installation (02) further comprises a decantation unit (13a) for separating the waste solution coming from the flocculation tank (12) by decantation into precipitate and decanted supernatant, which decanted supernatant is fed to the processing tank (14), and a centrifugation unit (13b) for further separating the precipitate produced by the decantation unit (13a) by centrifugation into further precipitate and centrifuged supernatant, which centrifuged supernatant is fed to the processing tank (14). There are also described corresponding processes for recycling wiping solution.

First claim

The invention claimed is:

1. A process of recycling a wiping solution of one or more intaglio printing presses, comprising the following steps:
i. inducing a flocculation of ink constituents contained in a waste wiping solution coming from the one or more intaglio printing presses to produce a flocculated solution;
ii. separating the flocculated solution by centrifugation into a precipitate and a centrifuged supernatant;
iii. pre-treating the centrifuged supernatant to produce a pre-treated solution for subsequent filtering;
iv. filtering the pre-treated solution to produce a recycled solution; and
v. extracting a selected share from the recycled solution, treating the selected share, and introducing the treated selected share back into the recycled solution to form a recombined recycled solution,
wherein the recombined recycled solution is recycled to produce a fresh wiping solution for use by the one or more intaglio printing presses.

2. The process according to claim 1 , wherein the flocculation is induced at step i by adding a selected flocculating agent to the waste wiping solution, and wherein substantially all of the selected flocculating agent is removed with the precipitate that is separated out by centrifugation at step ii.

3. The process according to claim 1 , wherein the pre-treated solution is produced at step iii by adding a selected filter aid agent to the centrifuged supernatant.

4. The process according to claim 3 , wherein the selected filter aid agent is Perlite.

5. The process according to claim 1 , further comprising the step of collecting the waste wiping solution from the one or more intaglio printing presses in a collecting tank before the flocculation at step i.

6. The process according to claim 5 , further comprising the step of collecting an overflow of the waste wiping solution from the collecting tank in an overflow tank.

7. The process according to claim 6 , further comprising the step of treating the overflow of the waste wiping solution collected in the overflow tank.

8. The process according to claim 7 , wherein treatment of the overflow of the waste wiping solution collected in the overflow tank comprises:
collecting and treating the overflow of the waste wiping solution collected in the overflow tank in a waste wiping solution treatment tank; and
filtering the overflow of the waste wiping solution treated in the waste wiping solution treatment tank to produce a filtered solution.

9. The process according to claim 8 , wherein the filtering of the overflow of the waste wiping solution treated in the waste wiping solution treatment tank is carried out by way of a filter press unit.

10. The process according to claim 8 , further comprising the step of supplying the following processing agents into the waste wiping solution treatment tank:
a selected flocculating agent for inducing a flocculation of ink constituents contained in the overflow of the waste wiping solution, including organic residues;
a neutralising agent for neutralising the pH of the overflow of the waste wiping solution; and
a filter aid agent to aid the filtering of the overflow of the waste wiping solution.

11. The process according to claim 10 , wherein the selected flocculating agent is calcium chloride (CaCl 2 ).

12. The process according to claim 10 , wherein the neutralising agent is sulphuric acid (H 2 SO 4 ).

13. The process according to claim 10 , wherein the filter aid agent is Perlite.

14. The process according to claim 8 , further comprising the step of subjecting the filtered solution to evaporation so as to recover distilled water which is either recycled to produce the fresh wiping solution or drained.

15. The process according to claim 1 , wherein treatment of the selected share of the recycled solution comprises:
collecting and treating the selected share of the recycled solution in a waste wiping solution treatment tank; and
filtering the selected share of the recycled solution treated in the waste wiping solution treatment tank to produce a filtered solution.

16. The process according to claim 15 , wherein the filtering of the selected share of the recycled solution treated in the waste wiping solution treatment tank is carried out by way of a filter press unit.

17. The process according to claim 15 , further comprising the step of supplying the following processing agents into the waste wiping solution treatment tank:
a selected flocculating agent for inducing a flocculation of ink constituents contained in the selected share of the recycled solution, including organic residues;
a neutralising agent for neutralising the pH of the selected share of the recycled solution; and
a filter aid agent to aid filtering of the selected share of the recycled solution.

18. The process according to claim 17 , wherein the selected flocculating agent is calcium chloride (CaCl 2 ).

19. The process according to claim 17 , wherein the neutralising agent is sulphuric acid (H 2 SO 4 ).

20. The process according to claim 17 , wherein the filter aid agent is Perlite.

21. The process according to claim 15 , further comprising the step of subjecting the filtered solution to evaporation so as to recover distilled water which is either recycled to produce the fresh wiping solution or drained.

22. The process according to claim 1 , further comprising the step of adding fresh constituents to the recombined recycled solution to produce the fresh wiping solution.

23. The process according to claim 22 , wherein the fresh constituents include soft water, caustic soda (NaOH) and sulfonated castor oil (S.C.O.).

24. The process according to claim 1 , wherein the centrifugation is carried out at step ii by way of a centrifugation unit, and wherein the process further comprises the step of using part of the recycled solution for the purpose of carrying out a cleaning operation of the centrifugation unit.

25. The process according to claim 1 , wherein the filtering of the pre-treated solution at step iv is carried out by way of a filter press unit.

26. A process of recycling a wiping solution of one or more intaglio printing presses, comprising the following steps:
i. inducing a flocculation of ink constituents contained in a waste wiping solution coming from the one or more intaglio printing presses to produce a flocculated solution;
ii. separating the flocculated solution by decantation into a precipitate and a decanted supernatant;
iii. further separating the precipitate of the decantation by centrifugation into a further precipitate and a centrifuged supernatant;
iv. pre-treating the decanted supernatant and the centrifuged supernatant to produce a pre-treated solution for subsequent filtering; and
v. filtering the pre-treated solution to produce a recycled solution
vi. extracting a selected share from the recycled solution, treating the selected share, and introducing the treated selected share back into the recycled solution to form a recombined recycled solution,
wherein the recombined recycled solution is recycled to produce a fresh wiping solution for use by the one or more intaglio printing presses.

27. The process according to claim 26 , wherein the flocculation is induced at step i by adding a selected flocculating agent to the waste wiping solution, and wherein substantially all of the selected flocculating agent is removed with the precipitate that is separ

Assignees

• Kba Notasys Sa

Inventors

• Martini Giacomo
• Nery Veronique

Classifications

• C02F2103/34

  from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 · CPC title

• C02F9/00

  Multistage treatment of water, waste water or sewage · CPC title

• C02F1/52

  by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)} · CPC title

• C02F1/385

  by centrifuging suspensions (centrifuges B04B) · CPC title

• B41F35/00 Primary

  Cleaning arrangements or devices {(in manifolding apparatus or the like B41L41/00)} · CPC title