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Isostatic pressing

Isostatic pressing is the high-compression molding of powered materials, such as ceramics, powered metals, plastics, carbides und composites, into high-density isotropic forms that are free of cracks, strains an laminations.

The process employes a chamber filled with liquid which is applied under hydraulic pressure simultaneously and uniformly to all surfaces of the part beiing formed.

The powders to be compacteed are encapsulated in a shaped membrane, known as a bag tooling, which serves both as a mold for the part and as barrier against the hyrdaulik liquid.

Wet Bag Pressing

Wet bag

Wet bag pressing

  • The material is filled into a flexible tool, usally out of rubber.
  • The filled tool is sealed and prepared for pressing
  • The tool is cleaned, to keep dirt from contaminating the pressing medium
  • The tool is inserted into the pressing chamber which is filled with the pressing fluid. That is why it is called "wet" bag pressing.
  • The press cycle is as follows: The tolls is inserted into the vessel, pressure applied, pressure removed and then the tool removed.

Dry Bag Isostatic Pressing

Dry bag

Dry bag pressing

  • The material is filled into the tool
  • The pressure chamber is shown with a dry bag tool sealed in the chamber
  • The pressure vessel is sealed with a specially design seal called a master bag. This seal separates the pressing medium from the actual tool. The press tool remains dry.
  • The press cycle is as follows: The tool is inserted into the vessel, pressure applied, pressure removed and then the toll removed.

The difference between dry bag and wet bag tooling methods?

In the wet bag method, the filled toll is inserting into the, already with pressing fluid filled pressure vessel and pressed. Therefore the tool comes directly in contact with the fluid.

In the dry bag method, the pressure vessel is sealed with a specialy designed seal called a master bag. This seal is between the press toll and the pressing fluid. Therefore the press tool does not come in contact with the fluid.