Wetlaid unitary stratified composite containing absorbent material
AssigneeWeyerhaeuser Company
InventorsPeter A. Graef, Colin Elston, Daniel T. Bunker, Fred B. Howard, Jeffrey D. Mathews, Shahrokh A. Naieni, Charles E. Miller
Life of this patent
Estimating the term…
Abstract
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.
Claims39
A wetlaid absorbent composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
A wetlaid absorbent composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising polyethylene terephthalate fibers and a bicomponent binding fiber;
- the second stratum comprising crosslinked cellulosic fibers, a wet strength agent, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising a wetlaid composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a wetlaid composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- and
- (c) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a wetlaid composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- and
- (d) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a wetlaid composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- (d) an intermediate stratum interposed between the wetlaid composite and the storage stratum;
- and
- (e) a liquid impervious backsheet.
An absorbent composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising polyethylene terephthalate fibers and a bicomponent binding fiber;
- the second stratum comprising crosslinked cellulosic fibers, a wet strength agent, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising a composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- and
- (c) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- and
- (d) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- (d) an intermediate stratum interposed between the composite and the storage stratum;
- and
- (e) a liquid impervious backsheet.
A foam-formed absorbent composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising a foam-formed composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a foam-formed composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- and
- (c) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a foam-formed composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- and
- (d) a liquid impervious backsheet.
An absorbent article comprising:
- (a) a liquid pervious topsheet;
- (b) a foam-formed composite comprising a first stratum, a second stratum, and a transition zone intermediate and coextensive with the first and second strata;
- the first stratum comprising synthetic fibers and a binder material;
- the second stratum comprising crosslinked cellulosic fibers, a binder material, and an absorbent material;
- and
- the transition zone comprising fibers from the first and second strata commingled substantially uniformly across the composite's width and along the composite's length;
- (c) a storage stratum comprising an absorbent fibrous material;
- (d) an intermediate stratum interposed between the composite and the storage stratum;
- and
- (e) a liquid impervious backsheet.
Dependencies are inferred from the claim text.