International Paper Company

Roy S Swenson

Michael E Ring

Charles J Davis

Ralph E Brandon

Donald M MacDonald

Donald M Macdonald

Jasper H Field

F Keith Hall

Madhu P Godsay

Joseph N Kent

Both the wet strength and the folding endurance of bleached kraft paper product are improved by subjecting the paper to steps of densification and high temperature treatment during its production.

Bleached kraft paperboard by densification and heat treatment

Both the wet strength and the folding endurance of SCMP and sulfite paperboard are improved by subjecting the board to steps of densification and high temperature treatment during its production.

Densification and heat treatment of paperboard produced from SCMP and

Both the wet strength and the folding endurance of kraft linerboard are improved by subjecting the board to steps of densification and high temperature treatment during its production.

Kraft linerboard by densification and heat treatment

An improved process for forming a non-woven fabric by wet-laying, on paper making equipment, staple length, synthetic fibers having a length to diameter ratio of about 400 to 3000, and an improved, non-woven fabric produced by the process. The process involves forming a stable, viscous, uniform, air-fiber-water dispersion by: adding the fibers to a high-shear agitated mixture of water and a dispersant to separate the fibers and to completely and uniformly distribute the individual fibers throughout the resulting, high-shear agitated, air, water and fiber mixture; and then, slowly adding a thixotropic thickener to the high-shear agitated mixture to form the viscous, air-fiber-water dispersion, having a nascent viscosity of about 10 to 125 cps., when measured at a shear rate of 30.5 sec..sup.-1, and in which the individual fibers are restrained from becoming entangled and from forming knits, bundles, and strings.

Wet-laid, non-woven fabrics

Viscous dispersion for forming wet-laid, non-woven fabrics

A method of producing textile-like non-woven essentially binderless webs from fiber furnishes at least about 70% of which comprise man made non-fibrillatable low denier fibers having no large area flat surfaces and which are at least about 1/4 inch in length with a length to diameter ratio of between about 400:1 and 700:1. The method includes a wet laying system in which sufficient wetting agent is added to the water used in dispersing the fibers to wet the fibers completely and reduce the surface tension of the water to between about 30-35 dynes. It also includes agitating the dispersion vigorously to create tumbling water surface conditions in which up to, but less than about 4% by volumeof air is entrained in the water in the form of tiny air bubbles to create a water/air emulsion in which the fibers are dispersed without generating any substantial amount of surface foam. A viscosity modifier in the form of a natural or synthetic gum is also added to stabilize the emulsion and help prevent the dispersed fibers from reflocculating.

Growing community of inventors

Central Valley, NY, United States of America

Roy S Swenson