Weyerhaeuser Company Limited

National Institute for Strategic Technology Acquisition and Commercialization

National Institute for Strategic Technology Acquisition

National Institute for Strategic Technology Acquisistion and Commercialization

National Institute for Strategic Technology Acquisitions and Commercialization

Fred B Howard

Peter A Graef

Charles E Miller

Daniel T Bunker

Colin Elston

Shahrokh A Naieni

Jeffrey D Mathews

Clifford R Bolstad

Rolland F Sultze

Hugh West

Kay Rokman

Juhani Jansson

David G Marsh

Eino Laine

Terry M Grant

Jeffrey D Matthews

Melissa L Dopps

An unitary stratified composite composed of a first stratum and a second stratum integrally connected by a transition zone is disclosed. The first stratum serves as a liquid acquisition stratum that rapidly acquires and then transfers liquid to the second stratum. The second stratum serves to withdraw liquid from the first stratum and further severs as a temporary storage stratum. Methods for forming the unitary stratified composite are also disclosed.

Unitary stratified composite

Methods for forming an absorbent fibrous composite containing absorbent material dispersed in bands through the composite and along the composite's length are disclosed. The methods generally include depositing a fibrous slurry on a foraminous support to form a web and depositing or injecting absorbent material into the web across its width to provide a web having absorbent material in bands along the composite's length. Drying the web provides a fluted absorbent composite. In one embodiment, the method is a wetlaid method and in another embodiment, the method is a foam-forming method. Preferably, the methods are twin-wire forming methods.

Methods for forming a fluted composite

A unitary stratified composite composed of a first stratum and a second stratum integrally connected by a transition zone is disclosed. The first stratum serves as a liquid acquisition stratum that rapidly acquires and then transfers liquid to the second stratum. The second stratum serves to withdraw liquid from the first stratum and further serves as a temporary storage stratum. Methods for forming the unitary stratified composite are also disclosed.

An absorbent composite () having a fibrous matrix that includes absorbent material is disclosed. The fibrous matrix defines voids () and passages between the voids, which are distributed throughout the composite. Absorbent material () is located within some of the voids (). Absorbent material located in these voids is expandable into the void. In a preferred embodiment, the composite's fibrous matrix includes resilient and matrix fibers (). The composite optionally includes a wet strength agent.

Reticulated absorbent composite

A unitary absorbent composite having a plurality of strata is disclosed. In the composite, adjacent strata are separated by a transition zone integrally connecting the strata. Each stratum includes fibers and a binder, and the transition zone includes fibers from adjacent strata. Method for forming the unitary composite are also disclosed.

Unitary absorbent system

Wetlaid unitary stratified composite containing absorbent material

Wetlaid unitary stratified composite

An unitary stratified composite composed of a first stratum and a second stratum integrally connected by a transition zone is disclosed. The first stratum serves as a liquid acquisition stratum that rapidly acquires and then transfers liquid to the second stratum. The second stratum serves to withdraw liquid from the first stratum and further serves as a temporary storage stratum. Methods for forming the unitary stratified composite are also disclosed.

Absorbent article containing unitary stratified composite

Absorbent article containing a wetlaid unitary stratified composite

Absorbent article containing a foam-formed unitary stratified composite

A densified web of cellulose fibers has a high absorbent capacity and good wet strength. The web is produced by combining cellulose fibers with a bonding agent, activating the bonding agent, allowing it to contact the cellulose fibers, and thereafter deactivating the bonding agent. The web is thereafter compressed in a cooled state to form a densified web. The web exhibits an absorbent capacity superior to that of prior densified and bonded webs.

Densified cellulose fiber pads and method of making the same

A method is disclosed for the densification of crosslinked fibers having a crosslinking agent loading level of from about 2.5 molar to about 5 molar %. The crosslinked fibers are compressed from an initial density of from about 0.02 g/cc to about 0.04 g/cc to a second density of from about 0.20 g/cc to about 1.00 g/cc by either the simultaneous or sequential application of heat and pressure. The surface temperature of the press is typically between about 60.degree. C. to about 180.degree. C. The compression force for the air laid or wet laid webs is in the range of about 800 psi to about 115,000 psi. Densifying the crosslinked fiber in this manner produces a compressed web having enhanced absorbent capacities of from about 21 g/g to about 15 g/g.

A densified absorbent web of cross-linked high-bulk fiber

Method of densifying crosslinked fibers

Growing community of inventors

Olalla, WA, United States of America

Fred B Howard