Use case: Injection molding machine for the production of automotive components

Adsorber on Hydraulic Unit

Injection molding machines can be roughly divided into two units: The injection unit, which prepares the raw material and injects it into the mold under pressure, and the clamping unit, which receives the mold and opens and closes it.

The hydraulics are an essential part of every plastic injection molding machine with toggle clamping units (partially hydraulic) or fully hydraulic clamping units. High energy efficiency, low mold costs, positive locking as well as the better adjustment possibilities of the clamping and locking forces with higher pressures speak for their use.

Rust in the hydraulic tank

Rust is caused by moisture entering the inside of the tank. If a tank is located at the outer end of an injection molding machine, the tank is exposed to significantly higher temperature fluctuations between standstill & operation but also due to external influences such as open gates. If the air in the tank cools down, the moisture contained in the air condenses and settles on the walls inside the tank.

Even if the oil test results do not indicate water in the tank, rust may have already formed. This is because water droplets form, but they stick to the tank walls and do not drip into the oil.

Use of an aeration dryer

An aeration dryer dries the air drawn in during the closing process of the injection molding machine, thus preventing moist air from entering the tank and condensing. In addition, the adsorber shows where the water is coming from by changing color. If the adsorber changes color from the bottom, the moist ambient air is dried when it is sucked in. If the adsorber changes color from above, the humid air inside the tank is dried. In this way, conclusions can be quickly drawn about the condition of the injection molding machine.

We recommend the VV-R series for use on hydraulic tanks of injection molding machines. The air flows through the adsorber and removes water from it. At the same time, the change in color of the silica gel from orange to green indicates the condition of the adsorber.

If the entire bed is discolored, the clamps on the aeration dryer can be opened and the contents replaced quickly and inexpensively.