James River Corporation of Virginia

Asten, Inc.

Fort James Corporation of Virginia

Frederick W Ahrens

Thomas N Kershaw

John Henry Dwiggins

Frank David Harper

Anthony O Awofeso

Gary L Worry

Dinesh M Bhat

Bruce W Janda

Walter P Wright

Thomas Gulya

Joseph R Pounder

James Loughran

James Benson

Controlling the velocity of a jet of foamed furnish leaving the slice of a pressurized headbox of a paper or a tissue making machine by measuring the density and pressure of a flow of foamed furnish provided by a pump to estimate an atmospheric pressure air content, measuring the pressure of the foamed furnish in the headbox, using the estimated atmospheric pressure air content and the measured pressure in the headbox to estimate the current velocity of said jet of foamed furnish, comparing the estimated current velocity with a target velocity and controlling the pump to move the estimated and target velocities closer to each other. An alternate embodiment controls jet velocity on the basis of comparing estimated and target headbox pressures.

Method of controlling headbox jet velocity for foamed furnishes

The present invention is an improved 7,3-broken twill, TAD fabric for use in the formation of a paper web. The present invention is also a process of using this fabric to produce a paper product having high bulk and absorbency. Finally, the present invention is the paper product produced in a TAD process using this fabric.

Papermaking fabric, process for producing high bulk products and the

A single or multi-ply tissue product includes at least one foam-formed ply incorporating at least about 100 ppm of forming-loop-incorporated surfactant, the ply includes from at least about 50% by weight to about 80% by weight of relatively short, high softness cellulosic fiber formed by chemical pulping of hardwood. The fibers have a weight average fiber length of between about 0.5 to about 2.2 mm, a coarseness of about 7 to about 14 mg of fiber per 100 m of fiber length (mg/100 m). The ply includes from at least about 20% by weight to about 50% by weight of relatively long strength-enhancing cellulosic fiber chosen from chemically pulped softwood fiber and chemi-thermo-mechanically pulped softwood fiber and mixtures thereof. The strength-enhancing cellulosic fiber have a weight average fiber length of about 2 to about 4 mm, a coarseness of about 14 to about 28 mg/100 m. Optionally, up to about 30% by weight of bulk-enhancing fibers having a three-dimensional anfractuous character may be provided. The ply is embossed to an emboss depth of at least about 0.020 inch, the percent loss in total dry breaking tensile strength upon embossing of the tissue being no more than about 80% of the percent loss in total dry breaking tensile strength upon embossing plies of a comparable conventional water formed tissue. The ply includes a basis weight of from about 4 to about 20 pound per 3,000 sq. ft. ream.

High softness embossed tissue

Novel multi-layer paper and tissue products are provided, which possess strength, softness and absorbency. The products comprise either at least two foam deposited paper layers, wherein the foams have different air contents therein, or foam and water deposited layers. The layers can be deposited at about identical feed pressures from a single headbox while still possessing differing tensile strength ratios. Novel processes for forming such products are also provided.

Multi-layer papers and tissues

A method and apparatus for separating surfactant depleted liquid from an at least partially stable foamed aqueous admixture of water, surfactant and air includes introducing the at least partially stable foamed admixture to a channel of preselected height, length, width and inclination at such a flow rate as the foamed admixture passes through the channel. A substantially translational motion of the foamed admixture is maintained through the bulk of the channel. As the foamed admixture translates through the channel, surfactant depleted liquid drains from the interstices thereof. The air content of the foamed admixture does not increase above the air content at which substantial overdrying begins to occur in the foamed admixture. Tranquil interface flow conditions are maintained in the flow of surfactant depleted liquid drained from the foamed admixture for so long as it is in contact with the admixture. Separation of the surfactant depleted liquid from the foamed admixture is carried out by the method and apparatus of the present invention.

Extraction method and apparatus

Growing community of inventors

Hortonville, WI, United States of America

Frederick W Ahrens