| 摘要 |
A process for making a stiffened and rigid paper includes preparing a pulp slurry consisting essentially of water, a cellulosic pulp, a crosslinker, and a starch, and optionally a binder; draining the liquid from the pulp slurry to form a web; and drying the web. Alternatively, a process for making a stiffened and rigid paper includes the step of adding at least one crosslinker at one or more locations, such as at the wet-end, dry-end, or at both ends of the papermaking process. Suitable crosslinkers include a glyoxal-containing crosslinker, a gluteraldehyde, a polyfunctional aziridine, a zirconium-containing crosslinker, a titanium-containing crosslinker, and an epichlorohydrin, and mixtures thereof. When a binder is employed, it can be added either in the dry or wet form. Provided is a neutral or alkaline process to produce a paper product having the improved mechanical properties of a laminated product in the Z-direction, without a lamination step. |
| 主权项 |
1. A process for making rigid paper, the process comprising:
preparing an aqueous slurry comprising cellulosic pulp and starch; draining the slurry to form a web; adding a crosslinker selected from the group consisting of glyoxal-containing crosslinkers, gluteraldehydes, and polyfunctional aziridines in an amount of about 0.3 to about 20 weight percent based on the weight of solids in the pulp slurry or web, wherein the crosslinker is added to the slurry, or to the web; and drying the web to produce a paper product, wherein the process does not include use of a hydrophilic polyacrylamide applied to the web; and wherein the paper product is a single ply paper having a basis weight in the range of about 65 lbs/3000 ft^2 to about 165 lbs/3000 ft^2, a folding endurance as measured by M.I.T. in the range of up to about 22.9, and a normalized Gurley stiffness in the range of about 369 to 4747. |
