Sizing of paperboard
Substrates for paperboard packing with improved internal sizing including the use of a combination of a dispersed rosin size (DRS) with an alkenylsuccinic anhydride size for reducing edgewicking with less use of the sizing agents.
1. A method of making a paperboard web, comprising:
providing a paperboard web;
applying to the paperboard web an internal sizing agent comprising a combination of a first dosage of dispersed rosin size (DRS) and a second dosage of alkenylsuccinic anhydride (ASA);
wherein the first dosage ranges from about 2 to about 8 lbs of DRS per ton of paperboard on a dry basis, the second dosage ranges from about 2 to about 5 lbs of ASA per ton of paperboard on a dry basis, and wherein the second dosage is less than the first dosage.
2. The method of claim 1 , wherein the first dosage ranges from about 6 to 8 lbs of DRS per ton of paperboard web, on a dry basis.
3. Paperboard produced by the method of claim 1 .
4. A paperboard comprising:
dispersed rosin sizing (DRS) in a first amount from 2 to 8 lb/ton of paperboard on a dry basis; and
alkenylsuccinic anhydride (ASA) in a second amount of from 2 to 5 lb/ton of paperboard on a dry basis.
5. Paperboard as in claim 4 , wherein the first amount is DRS from 6 to 8 lb/ton of paperboard on a dry basis.
6. Paperboard as in claim 4 , wherein the 1-hour Lactic Acid Edgewick test has a value of less than about 2.
7. Paperboard as in claim 6 , wherein the 1-hour Lactic Acid Edgewick test has a value of less than about 1.
8. Paperboard as in claim 4 , wherein the 24-hour Lactic Acid Edgewick test has a value of less than about 6.
9. Paperboard as in claim 8 , wherein the 24-hour Lactic Acid Edgewick test has a value of less than about 5.
10. Paperboard as in claim 4 , wherein the Peroxide Edgewick test has a value of less than about 6.
11. Paperboard as in claim 10 , wherein the Peroxide Edgewick test has a value of less than about 2.
12. Paperboard as in claim 4 , wherein the 1-hour Lactic Acid Edgewick test has a value of less than about 1, the 24-hour Lactic Acid Edgewick test has a value of less than about 5, and the Peroxide Edgewick test has a value of less than about 2.
13. A paperboard comprising:
dispersed rosin sizing (DRS) in a first amount from 2 to 8 lb/ton of paperboard on a dry basis;
alkenylsuccinic anhydride (ASA) in a second amount of from 2 to 5 lb/ton of paperboard on a dry basis;
wherein the Hercules Size Test (HST) value of said paperboard is at least as high as the HST of paperboard containing a third amount of DRS at least 12 lb/ton of paperboard on a dry basis, and substantially no ASA.
14. Paperboard as in claim 13 , wherein the first amount is DRS from 6 to 8 lb/ton of paperboard on a dry basis.
15. Paperboard as in claim 13 , wherein the second amount is ASA from 3 to 4 lb/ton of paperboard on a dry basis and the third dosage is DRS from 13 to 14 lb/ton of paperboard on a dry basis.
16. Paperboard as in claim 13 , wherein the 1-hour Lactic Acid Edgewick test has a value of less than about 1.
17. Paperboard as in claim 13 , wherein the 24-hour Lactic Acid Edgewick test has a value of less than about 5.
18. Paperboard as in claim 13 , wherein the Peroxide Edgewick test has a value of less than about 2.