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.
Claims46
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 at locations corresponding to said pressure bonded spots so that the liquid substance permeates the laminated layers in the immediate vicinity of said spots.
The method of claim 12 wherein two plastic backing layers are provided as outer layers on opposite sides of the laminated tissue layers.
An absorbent laminated sheet comprising:
- a plurality of individual absorbent tissue layers arranged as laminations in a stack;
- a first plastic backing layer along one side of the laminated tissue layers with thermoplastic compound applied between the plastic backing layer and the adjacent tissue layer;
- 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 including said compound 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 assembling a plurality of individual layers in a laminated sheet including means for assembling a first plastic layer along the underside of the laminated sheet;
- 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 compound in a liquid state to the upper side of the plastic layer in line with said spots prior to assembly thereof with the other layers in the laminated sheet in order to render said spots water repellent.
Dependencies are inferred from the claim text.