Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1993-07-26
1994-05-03
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
162175, 162180, 162183, 162184, 162185, D21H 2376
Patent
active
053084411
ABSTRACT:
Paper that is uniquely suitable for use in the aseptic packaging of foods, beverages, and the like is produced via a two step sizing process comprising an internal size step and a surface size step. The internal size includes approximately 1.0% anionic rosin and about 1.3 to 2.6% alum (based on the dry pulp weight) blended to a 4.0 to 4.5 pH controlled papermachine headbox stock furnish. Following web formation and drying, the surface size is applied with a composition including about 0.025 to 0.050% alkyl ketene dimer (based on the dry pulp weight) blended with a traditional starch formulation and sufficient sodium bicarbonate to both neutralize any unreacted alum present near the surface of the internally sized web and to produce a paper having a water extractable pH level of from about 4.0 to below 6.0. Secondary web drying follows the surface size application.
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"Trends in Second Generation AKD Sizing", by L. F. Watson, PIMA Nov. 1988, (vol. 70, No. 9) pp. 36-38.
Chin Peter
McDaniel J. R.
Reece, IV D. B.
Schmalz R. L.
Westvaco Corporation
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