Date of Award

12-1969

Degree Name

Master of Arts

First Advisor

Dr. Raymond L. Janes

Second Advisor

Dr. Stephen I. Kukolich

Third Advisor

Mr. James E. Kline

Access Setting

Masters Thesis-Open Access

Abstract

Paper contains an uneven distribution of fiber fractions through its cross section. The objective of this study was to determine how the rate of formation affected the structure and properties of paper. The structure of paper was analyzed with reference to the cross-sectional distribution of fines and the fines to long fibers ratio in the paper.

The formation rate and distribution of fins were varied by applying a vacuum to the British sheetmold system. As the fines were a different color than the long fibers, their distribution was determined by analyzing the brightness values of layers split from the paper.

The fines used in this study had a substantial effect on paper properties when added to a relatively unbeaten chemical pulp. In general, these additions increased increased the breaking length, burst, density, and fold and decreased the tear and air permeability of paper. An increase in the rate of formation was found to decrease the tear and air permiability of paper. An increase in the rate of formation was found to decrease the ratio of fines to long fibers, although the over-all retention of fibers was increased. Also, the distribution of fines through the thickness of the paper became more disproportionate as the formation rate was increased. Through these two effects, an incense in the rate of formation was found to decrease many strength properties of paper.

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Chemistry Commons

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