Method of producing twisted, curly fibers
View Patent ↗A method of forming twisted, curly fibers from a wet wood pulp without the aid of a wet fluffing process or a chemical cross-linker. The method includes forming the wet wood pulp into fiber bundles and subsequently thermally drying the fiber bundles. The invention also includes curly fibers derived from the method of the invention.
1. A method of producing twisted, curly fibers, comprising:
providing a slurry of a hydrophilic material;
forming the slurry of the hydrophilic material into a plurality of fiber bundles;
thermally drying the fiber bundles at a temperature between about 120 and about 400 degrees Celsius for a duration of between about 0.1 and about 60 seconds; and
defiberizing the dried fiber bundles.
2. The method of claim 1 , wherein the hydrophilic material is selected from the group consisting of microcrystalline cellulose, microfibrillated cellulose, wood pulp fiber, and combinations thereof.
3. The method of claim 1 , further comprising dewatering the slurry to a consistency between about 10% and about 60%.
4. The method of claim 1 , further comprising dewatering the slurry to a consistency between about 25% and about 40%.
5. The method of claim 1 , comprising extruding the slurry of the hydrophilic material through a disperser to form the fiber bundles.
6. The method of claim 1 , wherein the fiber bundles are between about 200 and about 5000 micrometers mean area-weighted convoluted width.
7. The method of claim 1 , wherein the fiber bundles are between about 1000 and about 2000 micrometers mean area-weighted convoluted width.
8. The method of claim 1 , wherein the thermal drying comprises flash drying.
9. The method of claim 1 , wherein the dried fiber bundles are dry defiberized.
10. The method of claim 1 , wherein the hydrophilic material comprises never-been-dried wood pulp.
11. The method of claim 1 , wherein fibers of the hydrophilic material have a two-dimensional, flat fiber morphology and individual fibers provided by the defiberizing the dried fiber bundles have a three-dimensional twisted fiber morphology.
12. A method of producing twisted, curly fibers, comprising:
providing a slurry of a hydrophilic material;
forming the slurry of the hydrophilic material into a plurality of fiber bundles;
thermally drying the fiber bundles at a temperature between about 120 and about 400 degrees Celsius for a duration of between about 0.1 and about 60 seconds; and
repulping the dried fiber bundles in water to defiberize the dried fiber bundles.
13. The method of claim 12 , wherein the hydrophilic material is selected from the group consisting of microcrystalline cellulose, microfibrillated cellulose, wood pulp fiber, and combinations thereof.
14. The method of claim 12 , further comprising dewatering the slurry to a consistency between about 10% and about 60%.
15. The method of claim 12 , further comprising dewatering the slurry to a consistency between about 25% and about 40%.
16. The method of claim 12 , comprising extruding the slurry of the hydrophilic material through a disperser to form the fiber bundles.
17. The method of claim 12 , wherein the fiber bundles are between about 200 and about 5000 micrometers mean area-weighted convoluted width.
18. The method of claim 12 , wherein the fiber bundles are between about 1000 and about 2000 micrometers mean area-weighted convoluted width.
19. The method of claim 12 , wherein the thermal drying comprises flash drying.
20. The method of claim 12 , wherein the hydrophilic material comprises never-been-dried wood pulp.
21. The method of claim 12 , wherein fibers of the hydrophilic material have a two-dimensional, flat fiber morphology and individual fibers provided by the defiberizing the dried fiber bundles have a three-dimensional twisted fiber morphology.