Degreasing and parts washing tunnel

Industrial washing tunnels

Coniex supplies industrial washing tunnels for degreasing and cleaning of metal parts. The degreasing tunnels are very flexible machines that allow the incorporation of different surface treatments to adapt the parts cleaning process to the customer’s objectives. The design and manufacture of a tunnel washer will depend on factors such as part morphology, material or production volume.

Industrial washing and degreasing tunnels are used for continuous washing of medium and large parts. This technology is ideal for in-line production processes with parts loading from the front and unloading from the rear.

Once the parts have entered the degreasing tunnel, they are transported by a conveyor belt through the different cleaning phases and processes included inside the tunnel. The speed at which the parts are conveyed varies to suit the characteristics of each operation.

There are many configurations that can be made in a degreasing tunnel to suit the location and dripping times of the parts.

Main characteristics:

  • Degreasing and industrial cleaning of parts in single or multiple stages
  • Particularly suitable for long or medium productions
  • They can incorporate different processes such as pre-washing, washing/degreasing, rinsing, blowing and drying.
  • Different surface treatments such as phosphating, pickling and passivation can also be carried out.
  • Spray washing of the inside and outside of the parts
  • Adjustable and variable working speed to adapt to each process
  • Parts can be loaded and unloaded manually or automatically.
  • Multiple add-ons available

Washing equipment configuration

As mentioned above, the washing tunnels can incorporate as many phases as necessary to carry out an adequate treatment of the parts. The most common processes are degreasing, rinsing, passivation, blowing and drying. At the same time, one or more degreasing agents at different concentrations can be added when necessary, or rinsed with osmosis or deionized water, depending on the degree of cleanliness required for the parts.

A mesh filter is installed in each treatment tank to retain shavings and small particles that have been detached from the part, so as not to affect the washing of subsequent parts and to prevent clogging of the sprinklers during the spraying phase.

The temperature of all phases of the machine is regulated by a digital thermostat.

The transport and movement of the parts inside the tunnel can be continuous or step by step, depending on the geometrical shape of the parts to be treated or the required production. In the step-by-step movement, it is a suitable solution for washing parts with complicated morphologies, since by stopping the belt every few seconds to wash a specific part, it is possible to work directly on parts that are difficult to access, for example blind holes.

There are different equipment configurations depending on the technology used to transport the parts:

  • Washing tunnels with conveyor belt
  • Degreasing tunnels with overhead conveyors
  • Rotary drum cleaning tunnels
  • Tunnels with special requirements, such as more than one conveyor belt, specific trolleys, use of different degreasing agents, etc.


The way parts are positioned varies depending on the type of process. For a continuous washing tunnel, the workpiece is usually placed on a belt with different perforation levels, while for tunnels that operate step by step, workpiece holder systems are used.

The loading of the parts into the machine can be done manually by an operator. or automatically with conveyor belts, or even robots.

If the customer’s production requires the installation of a long tunnel, a U-shaped degreasing tunnel can be manufactured in which both the loading and unloading of parts is carried out at the same point. This tunnel format makes it possible to make better use of the available space.

At Coniex we supply a complete range of
screw and conveyor belt washers
and conveyor belt, which allows us to cover all the needs that arise in different types of industries. In addition to supplying standard parts washing equipment, we can also design and manufacture systems based on the needs and requirements of the customer and the part to be treated.

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