Foam formation is common in pulping, stock preparation, and paper machine circulation systems. Excessive foam reduces drainage efficiency, affects sheet formation, and leads to operational instability. Defoaming agents help eliminate foam quickly and prevent its reformation during continuous production.
In pulping systems, air entrainment caused by mechanical agitation and chemical additives often leads to persistent foam. Efficient defoamers reduce foam volume and improve fiber dispersion. This enhances washing efficiency and reduces chemical consumption.
In paper machines, foam in white water systems may affect vacuum dewatering and cause sheet defects. Defoamers improve drainage and reduce pinholes, improving paper quality. Low-silicone or non-silicone defoamers are often preferred to minimize surface contamination.
Process stability is critical in high-speed paper production. Long-lasting defoaming performance ensures continuous operation without frequent dosage adjustments. Proper additive selection also minimizes impact on retention systems.
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