Corrugated Cardboard carton Production Line Parts Brake Pads Set
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Brake Pads,Disc Brake Pads,Round Brake Pad,Performance Brake Pads LLY PACK(foshan) Co.,Ltd. , https://www.llypack.com
High Temperature / Wear Resistant
Choose the right drying technology (1)
Drying is an essential process for all plastics processors, as it plays a critical role in ensuring the quality of the final product. Choosing the right drying method can significantly reduce costs and energy consumption, making it vital to evaluate both the technology and its associated expenses carefully. The moisture content in materials directly affects their rheological properties during processing. As water content increases, shear viscosity decreases, which can alter melt flow characteristics and impact product quality. For instance, prolonged dwell time may lead to excessive moisture removal, causing increased viscosity, incomplete mold filling, and even material discoloration. Some property changes, like variations in mechanical strength or dielectric performance, are not visible to the naked eye and require specific testing to detect.
When selecting a drying process, understanding the material's hygroscopic nature is crucial. Materials are typically classified as either hygroscopic or non-hygroscopic. Hygroscopic materials absorb moisture from the environment, while non-hygroscopic ones do not. However, even non-hygroscopic materials can become hygroscopic if additives or fillers are present. This makes it important to analyze the material’s behavior before choosing a drying method.
The energy consumption involved in drying can vary depending on the complexity of the process and other factors, so the values provided should be considered as general guidelines rather than exact figures.
Convection drying is commonly used for non-hygroscopic materials. In this method, hot air is circulated through a drying hopper to remove surface moisture. Since the moisture is loosely bound, it can be easily removed by convection. The air is heated by a fan and then passed over the material, effectively reducing its moisture content.
For hygroscopic materials, the drying process generally involves three stages: initial surface evaporation, internal moisture removal with decreasing speed, and finally reaching equilibrium with the drying air. During the third stage, the temperature between the inside and outside of the material becomes uniform. Even when no more moisture is released, it doesn’t mean the material is completely dry—it has reached a balance with the surrounding environment.
The dew point temperature of the drying air is a key parameter in drying technology. It represents the temperature at which the air becomes saturated with moisture, leading to condensation. A lower dew point indicates drier air, which results in less residual moisture but also slower drying. Therefore, optimizing the dew point is essential for achieving efficient and effective drying.