Absorbent articles with reduced cross-directional wrinkles

Details Absorbent articles with reduced cross-directional wrinkles Absorbent articles with reduced cross-directional wrinkles

1996-11-27

1998-10-06

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428156, 4285375, 428913, 264119, 264167, 264282, 264284, 604379, 604380, 6043851, 162109, 156209, B32B 300, B29C 4900, D21H 1100

Patent

active

058174001

ABSTRACT:
Absorbent articles containing absorbent cores of fluff pulp frequently contain wrinkles in the absorbent core that run from side to side of the article, typically normal to the machine direction in the manufacturing process. Side-to-side wrinkles are deleterious in that they provide large flow channels for urine or other body fluids to escape to the edge of the article. Frequently, such wrinkles are present after manufacturing, before the article has been folded or worn. The cause of the wrinkles is believed to be due to natural instabilities during compression of the fluff pad shortly after it is formed. Means for reducing cross-directional wrinkles include the use of grooved, drilled, or patterned compression rolls to densify the fluff pulp while providing opportunities for reduced in-plane displacement during compression or, if in-plane displacement does occur, providing paths for cross-directional displacement as well as machine-direction displacement so that continuous CD wrinkles cannot form. The use of large diameter rolls with soft rubber covers can also be used.

REFERENCES:
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patent: 4892535 (1990-01-01), Bjornbery et al.
patent: 5167897 (1992-12-01), Weber et al.
patent: 5387385 (1995-02-01), Murji
patent: 5429686 (1995-07-01), Chiu et al.
DeCrosta, Edward F., "Experimentally Determined Equations for Water Removal in the Press Section: Suction Box De-watering," Tappi Journal, vol. 56, No. 11, Nov. 1973, pp.100-106.
Wrist, P. E., "The Present State of Our Knowledge of the Fundamentals of Wet Pressing," Pulp and Paper Magazine of Canada, vol. 65, No. 7, Jul. 1964, pp. T284-T296.
Yih, Chia-Shun and S. J. McNamara, "The Crushing of Wet Paper Sheets," Tappi Journal, vol. 46, No. 3, Mar. 1963, pp. 204-208.

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