Bag to Cage Fitment: A Technical Perspective

Bag to Cage Fitment: A Technical Perspective

Filter bags stand as key components within air pollution control systems, their correct selection, design, and fitment being paramount for seamless and prolonged operation. Various factors come into play when considering the fitment of filter bags, including their inherent elongation during handling and manufacturing, as well as their specific properties, which must be meticulously accounted for in the design phase.

During the design stage, different criteria are applied based on the filter media being utilized. Whether it be felt or woven products, membranes, or non-membrane materials, each demands distinct fitment guidelines and cage design specifications. Every detail, from the spacing between cage vertical wires and horizontal rings to the selection of appropriate cage materials and coatings, holds significance, particularly in defining the correct clearance between the filter cage and the filter bag (Bag-to-Cage Fitment).

Consider, for instance, the case of a glass with ePTFE membrane, where the objective is to minimize mechanical stress during operation and cleaning phases. Achieving this necessitates a precise synergy between cage design and filter bag construction, adhering strictly to engineering guidelines. Improper fitment, be it too loose or too tight, can result in various damages to filter bags, leading to premature failures such as holes along vertical cage wires and punctures, typically concentrated at the top and bottom of the bags.

High Precision Filtration (HPF), drawing from the OEM and Optimization experience of CTP Team and its OTP division, meticulously oversees all aspects mentioned above, consistently aiming for a fully technical approach that ensures each project operates at the cutting edge of filtration technology.

In conclusion, the fitment of filter bags onto cages transcends mere maintenance; it embodies a technical endeavor where precision and expertise are paramount.

Contact our team to ensure your filtration system receives the meticulous technical support it deserves!

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Images from HPF filter bags workshop in Italy : Fitment check and trial before of mass manufacturing of a 6” diameter, 10m long Fiberglass with PTFE impregnation and ePTFE membrane (PTFE felt top and bottom reinforcements) on a supporting mild steel with cataphoresis coating cage. Application : Cement Industry – Kiln Raw Mill process dedusting unit 2 fans system - > 500.000 Am3/h Gas Flow – 990 g/Nm3 inlet dust load


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