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US 8,012,565 B2Granted
Lyocell nonwoven webs
AssigneeWeyerhaeuser NR Company
InventorMengkui Luo
Life of this patent
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Abstract
Absorbent structures with nonwoven meltblown lyocell fiber webs are described which have excellent liquid distribution properties. The absorbent structures comprise at least two nonwoven meltblown lyocell fiber webs with superabsorbent polymer intermediate the two webs. Methods for making the structures are also described. The structures are particularly useful for use in disposable hygienic products.
Claims18
An absorbent structure comprising:
- at least one first nonwoven meltblown lyocell fiber web;
- at least one second nonwoven meltblown lyocell fiber web;
- said first and second nonwoven meltblown lyocell fiber webs each having an upper surface, a lower surface, longitudinal edges and width edges;
- a superabsorbent polymer intermediate said lower surface of said first web and the upper surface of said second web;
- and
- wherein said absorbent structure has first thickness;
- and
- wherein said first and second web are conterminous,
- the longitudinal edges and the width edges have a second thickness less than the first thickness, and
- the perimeters of the lyocell webs are bonded together
- wherein the superabsorbent polymer is the only material between the first and second webs within the bonded perimeters.
8 more elements
A method for making an absorbent structure comprising the steps of:
- providing at least one first nonwoven meltblown lyocell fiber web;
- providing at least one second nonwoven meltblown lyocell fiber web;
- said first and second nonwoven meltblown lyocell fiber webs each having an upper surface, a lower surface, longitudinal edges and width edges;
- providing a superabsorbent polymer intermediate said lower surface of said first nonwoven meltblown lyocell fiber web and the upper surface of said second nonwoven meltblown lyocell fiber web;
- wherein said first and second nonwoven meltblown lyocell webs are conterminous;
- wherein said absorbent structure comprising said first and said second nonwoven meltblown lyocell webs together have a first thickness;
- wherein said longitudinal and said width edges are compressed to a second thickness less than said first thickness, and
- wherein the perimeters of the lyocell webs are bonded together
- wherein the superabsorbent polymer is the only material between the first and second webs within the bonded perimeters.
6 more elements
A method for making an absorbent structure comprising the steps of:
- providing at least one first never-dried nonwoven meltblown lyocell fiber web;
- providing at least one second never-dried nonwoven meltblown lyocell fiber web;
- said first and second never-dried nonwoven meltblown lyocell fiber webs each having an upper surface, a lower surface, longitudinal edges and width edges;
- providing a superabsorbent polymer intermediate said lower surface of said first never-dried fiber web and the upper surface of said second fiber web;
- and
- wherein said first and second never-dried nonwoven meltblown lyocell fiber webs are conterminous;
- wherein said absorbent structure comprising said first and second never-dried nonwoven meltblown lyocell fiber webs each have a first thickness;
- wherein said absorbent structure is compressed to a thickness less than said first thickness;
- and
- drying said never-dried nonwoven meltblown lyocell fiber webs
- wherein the superabsorbent polymer is the only material between the first and second webs within the edges.
8 more elements
Dependencies are inferred from the claim text.