Multi-ply paper product and method of making the same
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United States of America Patent
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Jul 1, 1997
Issued Date -
N/A
app pub date -
Jun 13, 1996
filing date -
Oct 11, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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