Technical Report
 

Bark chemicals from Shasta red fir as stiffening agents for corrugating medium

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  • In these tests, phenolic constituents from bark of Shasta red fir were found ineffective as stiffening agents for corrugating medium. Other means of application, however, may be effective. Gum from inner bark of Shasta red fir was not so effective as a beater additive as was locust bean gum, but it was effective as a coating agent. Most effective beater additives are mannogalactans; Shasta red fir gum is mainly an arabogalactan. Conclusions were that: - Phenolic constituents of bark from Shasta red fir were ineffective as beater additives. - As an additive, gum from the bark was not so effective in increasing Concora values as was locust bean gum. - The gum was effective in increasing Concora values when applied as a coating agent.
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