Features and benefits of vacuum drying
Vacuum drying efficiently removes moisture from resin by lowering the pressure inside the drying tank. Because the boiling point of water is lowered in a vacuum environment, moisture can be evaporated at relatively low temperatures, making it suitable for drying resins that are sensitive to heat.
This low-temperature drying characteristic prevents thermal degradation of the resin and significantly reduces the risk of impairing the transparency and appearance quality required for Optical. In particular, the benefits of vacuum drying are significant for fine optical components, where even slight heat damage can affect product performance.
In addition, the evaporation rate of water increases in a vacuum, which shortens drying time. This leads to more efficient molding operations and reduced energy consumption, contributing to improved productivity. Furthermore, there is less air convection inside the vacuum hopper, which makes it easier for the entire resin to dry evenly.
Features
1. Vacuum drying prevents yellowing!
Drying environments such as high temperature drying or long drying times for pellets accelerate the thermal degradation of resin raw materials, which is one of the causes of discoloration, and cause yellowing. The vacuum heat transfer method utilizes a vacuum space where the boiling point of water is lowered, making it possible to evaporate water at a low temperature. Therefore, the DPD3.1 makes it possible to dry resin in a short time without raising the temperature as much as possible.
2. Short drying time reduces heat deterioration!
The hopper internal transfer fins are installed on the outer periphery and center and the temperature is controlled separately. This allows efficient heating and drying in a short time.
3. Improved transport control operability!
For many raw materials, the batch amount for secondary transport must be adjusted. In conventional machines, this was done by adjusting the valve. Therefore, in the DPD3.1, we have improved the batch amount by setting the touch panel, improving operability during material transport.
4. Equipped with air shock function, it solves problems such as bridges and blocks!
Some plastic raw materials are prone to bridging and blocking. The DPD3.1 comes standard with an air shock function for the initial drying stage, which solves these problems.
5. Energy savings are achieved through drying by reduced pressure and improved insulation specifications!
Energy saving through "reduced pressure drying"
Resin is heated by heat transfer rather than by hot air, and dried by reduced pressure. As a result, energy consumption is roughly half that of conventional dehumidifying dryers.
Energy conservation through "improved insulation specifications"
Compared to previous models, we have improved energy efficiency by improving insulation in every detail and preventing heat loss.
6. Contributes to reducing maintenance time and frequency!
Reduced maintenance time
The use of a lift and large discharge gate allows for quick removal and replacement of materials. In addition, the use of extruded materials gives the material a smooth surface with almost no resin adhesion, making cleaning easy.
Reduced maintenance frequency
This dramatically reduces the amount of film-like deposits on the mold surface, which can be a problem when molding gaseous materials, and significantly cuts down on the frequency of mold maintenance.
Flow Diagram
