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US 6,309,731 B1Granted
Wiping sheet
AssigneeUni-Charm Corporation
InventorsNaohito Takeuchi, Hiroki Gohda, Takayoshi Konishi, Kazuya Okada
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AssigneeUni-Charm Corporation
InventorsNaohito Takeuchi, Hiroki Gohda, Takayoshi Konishi, Kazuya Okada
Estimating the term…
After laminating together the first sheets crepe-processed at a high crepe ratio and the second sheet crepe-processed at a crepe ratio lower than that of the first sheet or not crepe-processed, the sheets are bonded together at bonding parts at a given pitch in rows. When the resulting bonded sheets are impregnated with a liquid, expansions are generated between the rows of bonding parts due to the difference in ratios of the elongation of the two sheets. The expansions take on the shape of large wrinkle according to the pitch of the bonding parts. At the production process of the sheet, the sheet is crepe-processed containing water at a preset ratio, whereby small wrinkles as residual crepe wrinkles are formed on the sheet surface. The large wrinkles and the small wrinkles can enhance the wiping effect.
A wiping sheet comprising at least one first sheet and a second sheet, the first sheet containing an absorbent fiber and being crepe-processed at a water content of 10% by weight or more to 25% by weight or less to have crepe wrinkles extending in one direction so that the first sheet elongates due to crepe restoration in a direction perpendicular to the direction along which the crepe wrinkles extend when impregnated with a liquid, the second sheet being crepe-processed at a crepe ratio lower than that of the first sheet or never crepe-processed so that the second sheet elongates less than the first sheet when impregnated with a liquid, the first and second sheets being overlaid together and partially bonded together at a plurality of bonding parts, wherein the bonding parts are arranged to form a plurality of rows extending parallel to each other in a direction intersecting the direction along which the crepe wrinkles of the first sheet extend and arranged at intervals, in each of which the bonding pats are individually formed in a short line extending obliquely to the direction along which the crepe wrinkles of the first sheet extend and are aligned at a given pitch in such a manner that any crepe wrinkles of the first sheet extending across the rows are interrupted by the bonding parts, and at least the first sheet is impregnated with a liquid so that large wrinkles are generated on the first sheet due to crepe restoration, the large wrinkles being formed by alternating mountainous zones and valley zones in each region between adjacent rows of the bonding parts, corresponding to the pitch between the bonding parts, whereby small wrinkles as residual crepe wrinkles are formed on the large wrinkles of the first sheet.
Dependencies are inferred from the claim text.