Multi-ply paper product and method of making the same

Details Multi-ply paper product and method of making the same Multi-ply paper product and method of making the same

1996-06-13

1997-07-01

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162127, 162128, 162147, 162189, 162199, 162301, 162DIG4, D21H 1114

Patent

active

056434138

ABSTRACT:
A method of producing a multi-ply paperboard product. A single aqueous recycled pulp stock which contains both heavy contaminants and lightweight contaminants is separated into three fractions, including a first fraction which contains the heavy contaminants, a second middle density fraction that contains the most desirable fibers, and a third low density fraction that contains the lightweight contaminants. The three fractions are discharged from a multi-channel head box onto a forming fabric, with the middle density fraction constituting the base ply in contact with the forming fabric, the low density fraction being the central ply and the high density fraction being the outer ply, thus forming a multiple-ply paperboard product.

REFERENCES:
patent: 3791917 (1974-02-01), Bolton
patent: 3833465 (1974-09-01), Campbell
patent: 4021295 (1977-05-01), Schmaeng
patent: 5011741 (1991-04-01), Hoffman
patent: 5055161 (1991-10-01), Hoffman

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