Paper substrates containing high surface sizing and low internal sizing and having high dimensional stability
This invention relates to a paper substrate containing high surface sizing and low internal sizing and having high dimensional stability, as well as methods of making and using the composition.
1. A paper substrate, comprising
a plurality of cellulose fibers; and
a sizing agent; wherein
the paper substrate has a basis weight of at least 10 lbs/3000 square feet; and wherein the paper substrate has a hygroexpansivity of from 0.6 to 1.5%, a CD Internal Scott Bond of not more than 350 ft-lbs×10 −3 /in 2 and/or an MD Internal Scott Bond of not more than 350 ft-lbs×10 −3 /in 2 .
2. The paper substrate according to claim 1 ,
wherein the paper substrate has a hygroexpansivity of from 0.6 to 1.25%.
3. The paper substrate according to claim 1 , comprising
from 0.25 to 10 gsm of the sizing agent.
4. The paper substrate according to claim 1 ,
wherein the paper substrate has an Internal Bond/sizing agent ratio that is less than 100 J/m 2 /gsm and a hygroexpansivity of from 0.6 to 1.25%.
5. The substrate according to claim 4 , wherein an Internal Bond/sizing agent ratio is less than or equal to 80 J/m 2 /gsm.
6. The substrate according to claim 4 , wherein an Internal Bond/sizing agent ratio is less than or equal to 60 J/m 2 /gsm.
7. The substrate according to claim 4 , wherein an Internal Bond/sizing agent ratio is less than or equal to 40 J/m 2 /gsm.
8. The paper substrate according to claim 1 ,
wherein the CD Internal Scott Bond is not more than 250 ft-lbs×10 −3 /in 2 and/or the MD Internal Scott Bond of not more than 250 ft-lbs×10 −3 /in 2 .
9. The substrate according to claim 1 , wherein the paper substrate has an Internal Bond/sizing agent ratio that is less than 100 J/m 2 /gsm and a hygroexpansivity of from 0.6 to 1.25%.
10. The substrate according to claim 1 , wherein the paper substrate has an Internal Bond/sizing agent ratio that is less than 60 J/m 2 /gsm and a hygroexpansivity of from 0.6 to 1.25%.
11. The substrate according to claim 1 , wherein said plurality of cellulose fibers comprises recycled fibers.
12. The substrate according to claim 1 , wherein said sizing agent is at least one member of the group consisting of starch, polyvinylamine, alginate, carboxymethyl cellulose, and polyvinyl alcohol.
13. The substrate according to claim 1 , wherein said sizing agent is starch and said starch is selected from the group consisting of oxidized starch, cationic starch, ethylated starch, and hydroethoxylated starch.
14. The substrate according to claim 1 , where said sizing agent is starch, polyvinyl alcohol or mixtures thereof.
15. The substrate according to claim 14 , further comprising a filler.
16. The substrate according to claim 15 , wherein said filler is at least one member selected from the group consisting of calcium carbonate, precipitated calcium carbonate, clay, calcium sulfate hemihydrate, and calcium sulfate dehydrate.
17. The substrate according to claim 15 , wherein said filler is calcium carbonate.
18. The substrate according to claim 17 , wherein said calcium carbonate is precipitated calcium carbonate.
19. The substrate according to claim 15 , wherein said substrate has a caliper of at least 3 mils.
20. The substrate according to claim 15 , wherein said substrate has an opacity of from 85 to 105% as measured by TAPPI t-425.
21. The substrate according to claim 20 , wherein said substrate has an ISO brightness of at least 90 ISO brightness points.
22. The substrate according to claim 21 , wherein said substrate has a CIE Whiteness of at least 130 CIE whiteness points.
23. The substrate according to claim 22 , wherein said substrate has a CD Gurley Stiffness of from 100 to 450 mgf as measured by TAPPI t-543.
24. The substrate according to claim 23 , wherein said substrate has a MD Gurley Stiffness of from 40 to 250 mgf as measure by TAPPI t-543.
25. The substrate according to claim 1 , further comprising a filler wherein said filler is at least one member selected from the group consisting of calcium carbonate, precipitated calcium carbonate, clay, calcium sulfate hemihydrate, and calcium sulfate dehydrate.
26. The substrate according to claim 1 , further comprising a filler wherein said filler is calcium carbonate.
27. The substrate according to claim 1 , further comprising a filler wherein said filler is precipitated calcium carbonate.
28. The substrate according to claim 1 , wherein said substrate has a caliper of at least 3 mils.
29. The substrate according to claim 1 , wherein said substrate has an opacity of from 85 to 105% as measured by TAPPI t-425.
30. The substrate according to claim 1 , wherein said substrate has an ISO brightness of at least 90 ISO brightness points.
31. The substrate according to claim 1 , wherein said substrate has a CIE Whiteness of at least 130 CIE whiteness points.
32. The substrate according to claim 1 , wherein said substrate has a CD Gurley Stiffness of from 100 to 450 mgf as measured by TAPPI t-543.
33. The substrate according to claim 1 , wherein said substrate has a MD Gurley Stiffness of from 40 to 250 mgf as measure by TAPPI t-543.
34. A method of making the paper substrate according to claim 1 , comprising
contacting a solution containing from 0.5 to 10 gsm of sizing agent with a plurality of cellulosic fibers, wherein the solution has a solids content that is at least 12 wt % solids sizing agent and has a viscosity that is from 100 to 500 centipoise using a Brookfield Viscometer, number 2 spindle, at 100 rpm and 150° F.
35. The method according to claim 34 , wherein the solution has a viscosity of from 150 to 300 centipoise.
36. The process according to claim 35 , wherein the solution contains a sizing agent solids content that is at least 15 wt %.
37. The process according to claim 34 , wherein the solution contains a sizing agent solids content that is at least 15 wt %.
38. The method according to claim 34 , wherein said contacting occurs at a size press.