Paper with improved stiffness and bulk and method for making same
First Claim
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1. A paper or paperboard having improved bulk and stiffness comprising:
- a three layered single-ply I-beam structure having a top layer, a central layer and a bottom layer, wherein the central layer is a cellulosic core layer, and the top and bottom layers are starch based, size-press applied coating layers formed from a starch coating solution having starch solids from 12 wt % to 18 wt % that cover an upper and lower surface of the central layer with minimal penetration into the central layer, anda bulking agent selected from the group consisting of diamide salt based bulking agent, monostearamide of aminoethylethanolamine, distearamide of aminoethylethanolamine and quaternized imidazoline interpenetrated within the central layer.
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Abstract
The invention provides a three layered reprographic paper having improved strength, stiffness and curl resistance properties, and a method for making same. The paper has a central core layer made largely of cellulose and bulked with a bulking agent such as a diamide salt. A starch-based metered size press coating is pressed on both sides of the core layer, wherein the starch has a high solid content. The coating forms a three layered paper having an I-beam arrangement with high strength outer layers surrounding a low density core.
296 Citations
37 Claims
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1. A paper or paperboard having improved bulk and stiffness comprising:
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a three layered single-ply I-beam structure having a top layer, a central layer and a bottom layer, wherein the central layer is a cellulosic core layer, and the top and bottom layers are starch based, size-press applied coating layers formed from a starch coating solution having starch solids from 12 wt % to 18 wt % that cover an upper and lower surface of the central layer with minimal penetration into the central layer, and a bulking agent selected from the group consisting of diamide salt based bulking agent, monostearamide of aminoethylethanolamine, distearamide of aminoethylethanolamine and quaternized imidazoline interpenetrated within the central layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A paper or paperboard having improved bulk and stiffness comprising:
a three layered single-ply I-beam structure having a top layer, a central layer and a bottom layer, wherein the central layer is a cellulosic core layer, and the top and bottom layers are starch based, size-press applied coating layers formed from a starch coating solution having starch solids from 12 wt % to 18 wt % that cover an upper and lower surface of the central layer, a starch coat weights of each of the top and bottom coating layers being between 2 and 10 g/m2, and a bulking agent selected from the group consisting of diamide salt based bulking agent, monostearamide of aminoethylethanolamine, distearamide of aminoethylethanolamine, and guaternized imidazoline interpenetrated within the cellulosic core layer. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. A method for making a paper or paperboard comprising the steps of:
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a) providing a furnish including cellulosic fibers and a bulking agent selected from the group consisting of diamide salt based bulking agent, monostearamide of aminoethylethanolamine, distearamide of aminoethylethanolamine, and quaternized imidazoline, b) forming a fibrous web from the papermaking furnish, c) drying the fibrous web to form a dried web, d) size-press treating the dried web with a high strength starch based size-press solution having starch solids from 12 wt % to 18 wt % to form top and bottom coating layers on a top and bottom side of the fibrous web, and e) drying the fibrous web after the size-press treatment to form a three layered single-ply having an I-beam structure. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification