The difference between wet bag and dry bag CIP (Cold Isostatic Pressing) lies in the method of containing and compressing the powder material.
In the wet bag process, the powder material is filled into a forming mold and sealed airtight outside the high-pressure vessel. The mold, along with the powder, is then submerged into a high-pressure liquid in a pressure vessel. Isostatic pressure is applied to the outer surfaces of the mold to compress the powder into a desired shape. After the pressing is complete, the entire bag is removed from the pressure chamber, and the part is obtained by cutting open the bag. This method is suitable for various kinds of small-quality production for complicated-shape or large-scale products and trial production research.
On the other hand, in the dry bag process, a flexible membrane is built into the pressure vessel and is used during all pressing cycles. The powder material is contained within the flex mold bag, which is placed inside the pressure vessel. The flex mold is not directly in contact with the pressure fluid, as the membrane isolates the pressure fluid from the mold. This process is cleaner because the flex mold does not become contaminated with wet powder. Additionally, less cleaning of the vessel is required. The dry bag process is suitable for automated mass production of powder products and features rapid cycles.
Both wet bag and dry bag CIP processes are used for cold isostatic pressing, which is a solid-state manufacturing technology for consolidating metal and ceramic powders. The wet bag CIP process is more manual and suitable for experimental research and small batch production, while the dry bag CIP process is more automated and allows for high-volume production of relatively simple shapes.
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