Oberlin pressure filters of all your filtration requirements.

Filtration Solutions

Filtration is a key part to many processes be it grinding, food processing, zinc phosphating or the chemical industry. Whenever there is a situation with solids in suspension in a fluid, a potential is there to reduce performance in the process.

Filtration

• This is where the dirt size created by the process is established so that the required level of filtration can be returned to the process to give good results.
• The following factors can affect the filtration process when it comes to grinding:

1. Wheel grit size and how it fractures giving a final size.
2. Ratio between metal removal rate and abrasive used.
3. Type of dressing the machine uses for wheel conditioning.

Particle size and chip shape that has to be filtered out.

• Type of fluid to be filtered, water based or oil based.
• Flow rate of fluid to be filtered determines the area of filter required.
• The filter process could be by disposable media, cleanable belt or even filter aid being added to the process.

• Various features of the process require different delivery.

1. Pumps come in different sizes in terms of delivery and pressure.
2. In a given process the following pumps may be required:
   •  300 litre/min at 10 bar
   •  150 litre/min at 4 bar
   •  50 litre/min at 1 bar
   •  80 Litre /min at 70 bar
3. Often more than one machine may need to be connected to a system this may result in one system requiring 20 plus pumps due to the process.

• If the process needs to be kept at a constant temperature then refrigeration can play a major part and the following factors need to be accounted for:
  1. Machine spindle power will add heat to the fluid.
  2. Cutting process will added heat to the fluid.
  3. Pumps delivering fluid will add heat.
  4. Part stability due to different temperatures needs to be taken into account and the system may need to work on fixed or ambient tracking.
  5. How well the fluid will react to chilling or heating.

• Fluids come in two basic forms water based or oil based in the metal cutting process. For other processes such as Zinc Phosphating the fluid is of a different base.
  1. For water based fluids we may have a turnover ratio of 5 to 7 times per hour for oil this could go up to 10 times per hour.
  2. The process can not only add particles to be filtered out but air entrainment.
  3. The filter will need to take into account these problems.

• This part of the process is all to often over looked for example:
  1. Water quality varies across the country so this should be taken into account. Hard water when mixed with a cutting fluid can make soap which will coat a filter and therefore impede the filtration process.
  2. Pumping fluid can change the fluid character including adding air.

• Various factors have to be taken into account with the tank shape and size.
  1. Turnover rate of fluid
  2. Tank shape. e.g. deep tank helps remove air entrainment.
  3. How much room there is on the shop floor.
  4. Can the pumps be placed in an acceptable position to pump the fluid?
  5. Pumps, are they accessible for maintenance?
  6. Will the dirty fluid be pumped to the filter or will it be gravity fed?