When flakes of softwood are exposed to heat during the press cycle, and at temperatures as low as 90 [degrees]C, losses in lignin, holocellulose, and acetyls combined with a general degradation of the hemicellulose to various sugars results in a complex mixture of acids generally described as decarboxylated rosin acids (Hawley's Condensed Chemical Dictionary 2002, Kolin and Dannon 1998).
The complex mixture of rosin is already at the ignition temperature during the press cycle.
None, with the exception of rosin, should ignite and sustain combustion in the intermittent flame region.
"Gum rosin, and its derivatives, are a key raw material for publication gravure inks, so the current high pricing has a significant effect on our product cost," said Dr.
Other areas of concern include rosin resin and titanium dioxide.
For those of you wondering about the difference between a rosin
and a resin, that's actually a lesson I learned a few years ago from Sanju Arora at Cookson Electronics A paper we wrote on flux selection defined the relationship between the two material sets this way: "Rosins
are a subset of a larger chemical family of resins.
Keywords: Rosin; Resin acid; Pinaceae; Isopimaric acid; Dehydroabietic acid; 13 [alpha],-H-[delta].sup.8]-dihydroabietic acid; EBV-EA actication; Two-stage mouse skin carcinogenesis test
Rosin is a widely used natural product that may still have unknown potential.
Rosin is commercially produced by removing turpentine from the oleoresin of Pinus species.
Although rosin has been used to size paper for nearly 200 years, papermakers have used the trial-and-error approach in making most of their decisions about how to apply it for good results.
All of the sizes were cationic dispersed rosin sizes, a popular and versatile type of rosin size.
The ability to calculate sizing performance with mathematical expressions should help to take some of the empiricism out of rosin sizing.