Eco filter and what's behind them
 

The ecological oil filter cartridge with many patents

 

During its entire service life, an oil filter has the job of removing unwanted substances and particles from the oil circulation. After its mission has been accomplished successfully it is
the filter that is removed and disposed of. Ideally in one piece, without extensive waste separation.

 

The up-to-date and environmentally friendly solution is therefore the Eco oil filter module. This consists of two parts

 

  • firstly the filter housing (made from aluminium or plastic), which remains with the vehicle during its entire lifetime and can take on auxiliary functions such as carrier for other units.

 

  • And secondly, there is the filter cartridge. This is made from paper and environment-friendly plastic that can be incinerated. The element is exchanged during regular service and incinerated in the waste incinerator with heat gain. What remains is a small pile of ash. For one of such systems,

 

MAHLE has been awarded the first prize from the BDI (Confederation of German Industry)
in 1996.

 

However, this is only one of the many good ideas in a MAHLE oil filter. No matter which filter type, most of the time it may contain several patented solution that makes a filter easier to fit, more effective and also more eco-friendly.For instance, take the OX 171/2D type, which is used in Citroën, Ford and Peugeot models. Peter Riedmayer, the product manager of Filter Aftermarket, is showing us at first the fleece disk. The perforation may appear somewhat small, but when it is put with its counterpart, the clever design becomes obvious. The piece of fleece is not only the end plate, but also a chambered seal. This means, that the fleece fits during assembly of the filter between stand pipe (housing) and internal support frame (filter). The result is optimum seal tightness. And there is another good idea: the design is eco-friendly thanks to ultrasound welding of the fleece to the filter paper—no glue or solvents
are used. Peter Riedmayer is now swiftly using the scalpel and is cutting through the filter element to show us the fine grooves in the black plastic carrier. This grooved internal support frame guides and fixes the pleated filter star and prevents any touching of the pleat ends. This ensures the unhindered flow of the oil.

 

Now the filter expert is turning the sample to show us the back opening of the plastic disk. Also here, a clever method is used for sealing: the plastic that is specially formed in this area acts as reliable sealing lip when fitted. “And how is the filter paper connected to the black plastic disk?“ Again, no solvent containing glue is used. Instead, the filter is plasticized in this area, i.e. the surface of the plastic disk is heated up, employing a patented process. The filter star is pressed into this soft plastic bed and fixed during hardening to form a safe bond.

 

Finally there remains the question about the conspicuous black plastic pin, which has
a sealing ring attached to it. What is its purpose? Well, this is the famous, patented draining device that will be appreciated by anyone who has ever changed an oil filter cartridge. This pin is pulled when the housing lid is opened and unblocks a draining hole that allows the housing to drain. Peter Riedmayer takes this opportunity to point out the shape and position of the pin, which moves during fitting of the filter on a defined path to find its place securely
in the intended hole.—Simply impressive.