Forest Sciences Commons^™

Differences In Picking Properties Between Casein And Soya Proteins, Shinya Takekawa

Paper Engineering Senior Theses

In this paper, the various picking properties are discussed at first, then in the experiment the fundamental differences between soya protein and casein in picking strength were studied.

Since it is considered that the penetration of the adhesives in a coating mixture into the base paper is important in picking, the picking strength of casein and soya protein were evaluated in functions of the beating level, sizing level and the amount of the adhesives. Whole experimental data were treated with the statistical method.

The results indicate that with the Wax test, the soya protein and casein have almost equal picking …

Cold Caustic Soda Pulping Of Eucalyptus Saligna, Tachipully A. Bhaskaran

Paper Engineering Senior Theses

A survey has been prepared covering the literature on the cold caustic soda pulping of Eucalyptus saligna. The survey was broadened to include pulping of all species of Eucalyptus by this particular process.

Experimental pulping of Eucalyptus saligna by the cold caustic soda process under a variety of conditions as well as pulping of aspen wood under one condition led to the following conclusions:

(a) Eucalyptus saligna is suitable for the manufacture of cold caustic soda pulp.

(b) alkali concentration of 30 grams per liter on full size chips of Eucalyptus saligna produces the best strength properties and fairly good …

A Quantitative Study Of The Effect Of Cutting & Fibrillation On Certain Paper Properties, Edwin C. Abbott

Paper Engineering Senior Theses

Introduction

From the time of the invention of paper about the year 105 by Ts'ai Lun, the process of beating the pulp as a preliminary to forming a sheet of paper has been recognized as of prime importance.

Early papermakers did not concern themselves greatly with theories; it was enough to know the process necessary to produce the various combinations of long and short, slow and free stocks according to the paper being made. When chemists began to enter the mills, however, their attention was naturally drawn to this important aspect of beating, and to the relationship between cellulose and …

Use Of Dialdehyde Starch In Coating Color Formulation, Craig F. Panse

Paper Engineering Senior Theses

A literature survey was conducted to determine what work, if any, had been done on dialdehyde starch as a coating adhesive. As a result of the survey, it was decided that experimental work would be started with the hope of overcoming some of the difficulties which confronted previous investigators and investigating further the use of dialdehyde starch as an adhesive.

After experimental preparation and evaluation of the coated and aftertreated sheets, the following conclusions were formed:

1. The addition of ten percent borax buffered or bisulphite buffered dialdehyde starch to conventional oxidized starch increases the surface strength of the coating …

A Study Of The Relationship Between Compressibility And Printing Smoothness, Richard R. Teugh

Paper Engineering Senior Theses

This investigation seems to indicate that printing smoothness, although dependent upon both smoothness of the sheet and compressibility, is much more dependent upon the smoothness of the paper being printed. For the samples tested printing pressure required seems to be a function of the smoothness and the deformation pressure with the smoothness apparently most important.

Cold Caustic Soda Pulp From Aspen Wood Some Facts On The Material Dissolved By The Process, Ralph D. Herrick

Paper Engineering Senior Theses

The available literature on the cold caustic soda pulping process, the composition of aspen wood, the composition of spent liquor from other pulping processes, paper chromatographic methods suitable for the analysis of wood and pulp hydrolyzates, and the material removed from aspen wood by the cold caustic soda pulping process have been surveyed.

Aspen wood hydrolyzates were analyzed using n-butanol: pyridine: water solvent system by paper chromatographic methods. Cold caustic soda pulp was prepared using a two hour soaking period at 25°^c temperature, and a 24 gram per liter caustic soda solution with a wood to liquor ratio …

The Potential Production Of Furfural From Sulfite Spent Liquors, Dale Keiser

Paper Engineering Senior Theses

Summary

Furfural was obtained in significant amounts by the action of mineral acid on pentose sugars. Pentose sugars are present in Sulfite Spent Liquors because of the hydrolysis which takes place during the pulping. The dehydrating action of the acid on the pentoses takes place during the pulping. The dehydrating action of the acid on the pentoses takes place at about 100 degrees Centrigrade. The furfural was distilled from the raw acidified spent liquor and can be purified further by fractional distillation. Hardwood Sulfite Spent Liquors gave the highest yields. This is because hardwoods contain more five carbon sugars. A …

The Bleaching Of Groundwood, Dale C. Hedquist

Paper Engineering Senior Theses

Present industrial methods for the bleaching of groundwood are discussed. The conditions and chemicals used for hypochlorite, sodium and zinc hydrosulphite, bisulphite and sodium and hydrogen peroxide bleaching are reviewed. Consistencies, retention time, pH and temperature for maximum brightness are discussed for each process. Chemical reactions for the removal of color are given for several of the processes.

Distribution Of Latex In Impregnated Paper, Donald Ward Nay

Paper Engineering Senior Theses

Introduction

Impregnation of paper products first began in the early 1920's. It became an important aspect of the industry during World War II when several factors came together to provide the basis for its growth. First of all, the development of synthetic materials provided many new agents with new properties in which to impregnate with. New equipment available at this same time made application and control of the process much easier. To put the drive in the new area, there simultaneously occurred a realization of many new products that impregnated papers could provide. The most important of those during World …

The Effect Of Starch On Clay Dispersions, John L. Moore

Paper Engineering Senior Theses

Cationic starches and anionic (oxidized) starches are compared in this thesis with respect to their effect upon dispersion. The methods used for determining dispersion quality were relative sediment volume (RSV) and the Hercules Hi-Shear Viscometer. These methods are compared as to-their applicability for use as practical. tools in determining color dispersion quality. Limitations of RSV are discussed with regard to clay-starch mixtures. Comparisons are made using both types of starch on predispersed and undispersed clays. Hercules rheograms are compared for samples using both starches and clays at 40 percent solids. The rheograms indicate no difference between the cationic and anionic …

A Study Of The Character Of Spent Liquor From The Neutral [Sic] Sulfite Semichemical Process Of Pulping, Bob Legault

Paper Engineering Senior Theses

Introduction

The utilization of spent liquors has been a major item in the research and development field of the pulp an paper industry. In recent years, this problem is being given more serious emphasis due to the tightening of antipollution laws by government agencies. This situation, together with the individual mill's desire to find programs for sound and effective recovery of values are major recipients of engineering and research man hours and dollars. This all points towards a better future for the industry and the community. A closer study than just analysis and physical constants determination is undoubtedly needed in …