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Journal articles
Magazine articles
Cationic emulsions of maleic anhydride derivatives of oleic and abietic acid for hydrophobic sizing of paper, TAPPI Journal 2020
ABSTRACT: Ordinary rosin sizing agents are mixtures of resin acids that include abietic acid and related compounds obtained from softwoods such as pine. Fatty acids, which are another byproduct of the kraft pulping of soft-wood species, also may have hydrophobic effects, but their use as sizing agents has seldom been considered. In the current study, abietic acid and oleic acid, in the absence of other components, were first modified by reaction with maleic acid anhydride. Then, the maleated derivatives (maleated oleic acid [MOA] and maleated abietic acid [MAA]), which were emulsified with cationic starch at the 1:1 and 3:2 ratio, respectively, were added to fiber furnish containing aluminum sulfate (papermaker’s alum). The prepared sheets were dried with a rotating drum on one side at 100°C at low pressure to cure the sizing agents. The chemical, optical strength, and absorption properties were measured. The presence of the sizing material was confirmed using time of flight secondary ion mass spectrometry (ToF-SIMS), and the retention of the sizing agent on fibers was supported by evidence of hydrocarbons on the paper surface. In addition to achieving sufficient water resistance features with MAA, a lesser hydrophobic character was obtained when using MOA. Compared to commercial applications, relatively large amounts of sizing agent were used to obtain a sufficient sizing degree. The MOA required 5% addition to achieve a similar sizing degree as MAA at the 2% level. The sizing treatments also resulted in substantial increases in tensile index value. Since cationic starch was used in the formulation of the sizing agents, the increase in tensile index may have been due to the influence of cationic starch. Contributions to paper strength from a combination of ionic complexation and mutual association of hydrophobic groups is also proposed. Depending on the amount of sizing agent, the yellowness increased, especially when sizing with MOA.
Journal articles
Magazine articles
Wet pressing and product quality: Review of previous pilot machine trials, TAPPI Journal July 2020
ABSTRACT: The purpose of wet pressing is to remove water by mechanical means to consolidate the web and minimize the energy expended in the dryer section. In this process, paper is compacted and densified to degrees that impact end-use performance. Average density is increased by pressing, which has implications for grades where stiffness is important. The z-direction density gradients can affect printing and converting. Lastly, pressing affects surface quality of paper and its response to printing. Broadly speaking, the final press nip dominates the paper surface roughness and the early press nips affect printing performance.
Magazine articles
Bay state paper company: a mill that reinvented itself, TAPPI JOURNAL, March 2000, Vol. 83(3)
Bay state paper company: a mill that reinvented itself, TAPPI JOURNAL, March 2000, Vol. 83(3)
Magazine articles
Global multi-pigment savvy from imerys, TAPPI JOURNAL, June 2000, Vol. 83(6)
Global multi-pigment savvy from imerys, TAPPI JOURNAL, June 2000, Vol. 83(6)
Magazine articles
Corrosion-resistant fiberglass-reinforced plastic composites for chlorine dioxide environments - third report, TAPPI JOURNAL, January 1996, Vol. 79(1)
Corrosion-resistant fiberglass-reinforced plastic composites for chlorine dioxide environments - third report, TAPPI JOURNAL, January 1996, Vol. 79(1)
Magazine articles
China paper technical program and exhibit came of age in 1995, TAPPI JOURNAL, March 1996, Vol. 79(3)
China paper technical program and exhibit came of age in 1995, TAPPI JOURNAL, March 1996, Vol. 79(3)
Magazine articles
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)
Magazine articles
Focus on japan, TAPPI JOURNAL, April 1995, Vol. 78(4)
Focus on japan, TAPPI JOURNAL, April 1995, Vol. 78(4)
Magazine articles
Suction roll pilot bearing failure due to inadequate lubrication, TAPPI JOURNAL, December 1994, Vol. 77(12), TAPPI JOURNAL, December 1994, Vol. 77(12)
Suction roll pilot bearing failure due to inadequate lubrication, TAPPI JOURNAL, December 1994, Vol. 77(12), TAPPI JOURNAL, December 1994, Vol. 77(12)
Magazine articles
The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)
The epa's process safety management program for preventing accidental chemical releases (40 cfr 68), TAPPI JOURNAL, April 1994, Vol. 77(4)
