Lamination anchoring method and product thereof
AssigneePaper-Pak Products, Inc.
InventorLionel M. Larsonneur
Life of this patent
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Abstract
An absorptive laminated sheet material having improved, moisture-resistant, pressure bonded spots for locking the lamination layers together. During fabrication of the laminated product, a thermoplastic low-viscosity wax-like substance, such as melted wax or paraffin, hot melt plastic or the like, is applied in minute amounts onto juncture lines of pressure bonded spots formed in the pads. The thermoplastic material penetrates the layers of the laminated product so that, on cooling, it forms a "wax rivet" at each bonded spot, thus providing added strength for the juncture lines and rendering the layers impervious to absorbed liquid at the points of application.
Claims39
The method of bonding the laminations of an absorptive sheet comprising the steps of:
- assembling a plurality of absorptive layers and at least one plastic outer layer in close proximity to each other as laminations of sheet material;
- bonding said layers together at selected spots by selectively applying pressure through the thickness of the sheet material against a backing member to develop a plurality of pressure bonded spots;
- and
- applying a wax-like substance at an elevated temperature in liquid form to said pressure bonded spots so that the liquid substance permeates the laminated layers in the immediate vicinity of said spots.
An absorbent laminated sheet comprising:
- a plurality of individual absorbent tissue layers arranged as laminations in a stack;
- at least one backing layer arrayed along one side of said stack;
- respective pluralities of pressure bonded spots arranged in juncture lines extending along said sheet, each bonded spot comprising said tissue layers and said backing layer being compressed tightly together in a localized region to form a compression bond;
- and
- means for structurally reinforcing the compression bond formed at an individual spot.
Apparatus for bonding together the individual layers of an absorbent laminated sheet to make the sheet resistant to delaminating when wet comprising:
- means for establishing a plurality of compression bonds throughout the individual layers at selected spots along the sheet;
- and
- means for selectively applying a thermoplastic resin in a liquid state to said spots to render said spots water repellent.
Dependencies are inferred from the claim text.