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Water absorption in polymers directly impacts both product quality and production efficiency — when exposed to ambient humidity, hygroscopic resins including PA, PC, and PET — take in water that penetrates polymer chains. The water isn’t superficial — it infiltrates the polymer matrix, leading to serious complications during melting and extrusion.

During compounding, polymers are heated to high temperatures to enable melt flow and uniform blending with additives}. When water remains trapped in the resin — it rapidly vaporizes into steam under heat. This steam generation creates bubbles, voids, or entrapped gas pockets, manifesting as surface blemishes, poor shine, or inconsistent texture. They reduce the part’s surface finish, and critically, they diminish mechanical performance, lowering fracture toughness and durability.

Beyond physical defects, moisture can induce chemical degradation. In polyesters and تولید کننده کامپاند پلیمری polyamides, hydrolysis occurs, a degradation pathway that fragments long-chain molecules. The breakdown lowers the polymer’s molar mass, and diminishes the material’s ability to flow uniformly. The material loses ductility and toughness, compromising long-term structural reliability, potentially leading to field failures in high-performance parts.

Eliminating moisture before processing is a mandatory industry practice. Typical drying protocols range from 80 to 120 degrees Celsius, over several hours tailored to resin sensitivity and ambient moisture. State-of-the-art facilities use precision drying technologies, ensuring moisture levels fall below 0.02% by weight.

Moisture regain can occur rapidly if storage is inadequate. Therefore, strict handling and storage protocols are essential. Storage must involve inert gas purging, sealed bins, or climate-controlled bins. Additionally, operators must continuously monitor ambient humidity in the compounding area, A limited window—often under an hour—must be maintained between drying and processing.

It is a fundamental parameter that dictates product quality and process reliability. Neglecting moisture control leads to expensive scrap, rework, and downtime. Poor moisture control erodes trust and compromises market reputation. By implementing rigorous drying, sealed handling, and environmental monitoring, manufacturers can ensure consistent, high-quality output.