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Correct method of using defoamers

Date:2014年7月28日 11:38

Defoaming agent also known as anti-foaming agents, having a low surface tension and a high surface activity and can suppress or eliminate the bubbles in the liquid material. Defoamers are generally formulated as a multi-component complex through. The main properties of the antifoam composition may be enhanced by surfactant complex. An active substance is suitable for foaming, depending on the application conditions. Under acidic conditions, such as stearic acid is a defoamer; under alkaline conditions and is a foaming agent. Effective at low temperatures, and high temperatures will be invalid.

(1), the defoamer was added point: pulp mill defoamers generally added in the bleaching and washing stages, usually in the washer, thickener was added and the slurry pool. Paper section defoamers general increase in machine headbox, slurry tank, coating and size press.

(2) adding: general use by two antifoam defoamer higher than the content of a more cost-effective, add respectively distant site. For example, one defoamers before beater added another in the headbox join.

(3), defoamers precipitation problems: such as amides defoamers, will cause precipitation leaving seam sieve clogging caused due to poor dispersion point paper and other paper fish eye disease. Some defoamers also sizing enhancement effect of a certain interference.

TypeInfo: Industry News

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