What is Vacuum dryer for plastics?

A vacuum dryer for plastic is an advanced drying technology used in plastic processing, particularly for high-performance hygroscopic materials. Unlike traditional drying methods, this system significantly reduces atmospheric pressure inside the drying chamber, allowing for the removal of internal moisture from polymers at lower temperatures and in less time. It is highly effective for the efficient dehumidification of technical polymers such as PET, PA, PBT, PC, or TPU.

The operating principle is based on the fact that reducing pressure lowers the boiling point of water, making it easier to evaporate even at moderate temperatures. This enables rapid drying without risking thermal degradation of the polymer. Additionally, the oxygen-free environment minimizes material oxidation—especially important for sensitive plastics.

One of the main advantages of the vacuum dryer for plastic is the reduction of drying times compared to other systems like desiccant or hot air dryers. While conventional processes may take 4 to 6 hours, vacuum drying can be completed in under an hour, depending on the material and initial moisture level. This makes it ideal for high-throughput environments, frequent material changes, or operations that require fast turnaround.

The system typically consists of a sealed chamber where the material is placed, a controlled heat source (via conduction or convection), a vacuum pump, and a pressure and temperature monitoring system. Advanced models also feature rotating hoppers that ensure uniform thermal distribution and constant exposure to heat flow.

In terms of energy use, while a vacuum dryer for plastic does require energy to create and maintain a vacuum, the shortened cycle time compensates for this, making it an energy-efficient option overall. Additionally, lower drying temperatures reduce the risk of yellowing, oxidation, or loss of polymer properties—especially useful in technical, medical, or food-grade applications.

In processes involving highly hygroscopic materials or requiring ultra-low moisture levels, vacuum drying proves to be a superior alternative. It’s also recommended for optimizing productivity without compromising quality.

At companies like Plásticos Lezo, which work with a wide range of technical materials and customized projects, the vacuum dryer for plastic is used strategically to ensure the efficient dehumidification of technical polymers. This ensures stable injection or extrusion conditions, reduces waste, and improves process consistency.

Moreover, its use enhances traceability and quality control by allowing precise documentation of drying parameters per batch—critical in sectors like automotive, medical, or electronics where regulatory standards are strict.

In summary, the vacuum dryer for plastic is an advanced solution for the reduction of drying times in hygroscopic plastics. Its ability to preserve material properties, speed up operations, and offer tight process control makes it a key tool in modern polymer processing.