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US 4,469,735 AGranted
Extensible multi-ply tissue paper product
AssigneeThe Procter & Gamble Company
InventorPaul D. Trokhan
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AssigneeThe Procter & Gamble Company
InventorPaul D. Trokhan
Estimating the term…
An extensible multi-ply tissue paper product having high tensile energy absorption (TEA); high liquid absorbency; and, preferably, high tensile strength efficiency. The product comprises plies which are preferably embossed and discontinuously adhered together. The product has high tensile energy absorption by virtue of having substantial extensibility in the machine direction which, preferably, results from its constituent plies having substantial MD extensibility induced by having undergone wet and/or dry foreshortening during their manufacture. The product has synergistically high liquid absorbency by virtue of at least two plies of the product having sufficiently different stress/strain properties that one ply will sufficiently constrain unadhered portions of the other ply from being elongated in the plane of the paper when wetted that such unadhered portions of the constrained ply will pucker in the Z-direction as its foreshortening-induced internal stresses are relieved. Preferably, the constraining ply is high bulk, wet-microcontracted tissue paper, and the other ply is dry-foreshortened tissue paper: e.g., dry-creped tissue paper. Also, the plies of preferred embodiments preferably have nominally equal MD extensibilities at rupture. Such preferred products have high tensile strength efficiency which is manifested by their having monomodal stress/strain characters. Embodiments of the invention such as two and three ply paper towels are especially useful for spill wipe-up applications.
An extensible multi-ply tissue paper product comprising a first ply and a second ply of tissue paper in associated relation with substantial juxtaposed portions thereof not adhered together, said plies comprising tissue papers having greater than ten percent extensibility in the primary direction of said product and having elongation at rupture values in said primary direction that are sufficiently close in value that said product has a monomodal stress/strain character in said primary direction, said first ply having a sufficiently higher stress/strain property than said second ply that unadhered portions of said second ply will pucker in the Z-direction of the product when the product is wetted.
An extensible multi-ply tissue paper product comprising a first ply and a second ply of tissue paper in associated relation with substantial juxtaposed portions thereof not adhered together, said plies comprising tissue papers having greater than ten percent extensibility in the machine direction of said product, said first ply having a sufficiently higher stress/strain property than said second ply that unadhered portions of said second ply will pucker in the Z-direction of the product when the product is wetted, said plies having stress/strain properties which are so related that the partial TEA contribution derived from said first ply is about two times as great or greater than the partial TEA contribution derived from said second ply when said product is elongated about ten percent in said machine direction, said second ply comprising tissue paper having a substantially non-linear stress/strain character which manifests a relatively low MD stress/strain modulus through the lowest one-third of its range of MD extensibility and a substantially greater MD stress/strain modulus through the highest one-third of its range of MD extensibility, said plies having MD elongation at rupture values which are so related that said product has a monomodal stress/strain character, and said plies comprise tissue papers which were each MD foreshortened from about fifteen to about thirty percent during their manufacture.
Dependencies are inferred from the claim text.