The working life of stainless steel filter, as well as its high quality and high performance, will depend on its manufacturing process including filter material selection, pleating, welding, gluing, and dust-free assembly.
First, we choose appropriate filter material with the main structure determined. And then we simulate its structure through digital media. The next step is to perfectly present the design through accurate manufacturing and processing with the help of experienced teams and advanced instruments.
Professional material is a precondition for a quality stainless steel filter. Coupled with high quality manufacturing processes, good quality control, and strict operation procedures, we ensure each step is in fastidious detail to make the product of high quality.
First the medium of stainless steel filter core is pleated to achieve a larger filtering area within a small surface. And it can be used as compact units such as filter element and filter.
Modern pleating machines can be used to process gasket made of multi-layer media which is composed of different metal fiber webs and/or wire mesh, and the height of the stainless steel filter element can be up to 1500 mm. Therefore, there will be stable components, which can operate stably for a long time under a high mechanical load.
The pleated stainless steel layer or smooth filter medium in the cylindrical filtration system will be connected through welding. The same operation will be done in the connection at the outlet or inlet interface of the filter medium. To achieve this, there are many welding methods. These methods will be chosen correspondingly according to the materials, thickness, and the appearing shape of the weld.
The welds in the filter element must be 100% sealed and must also be fine enough not to be coated. Because they can’t block too much filtering area, and fluid barrier shouldn’t appear in the shell. The finer and smoother the welds are, the higher their corrosion resistance will be.
The most common welding method is plasma welding and gas tungsten arc welding (GTAW or TIG). Metal inert gas welding (MIG) and metal active gas welding (MAG) are also used in rare cases.
High-alloy steel and all nonferrous metal can be welded using GTAW or TIG. Titanium welding is also included.
A high quality weld is available through resistance welding technology such as spot welding and roller welding. It can be reproduced without the surface of the materials affected.
Through using low current intensity, plasma welding is a welding method especially suitable for metal film and wire welding. For those very fine filter media which need to be welded, plasma welding will be a good choice.
Apart from welding technology, another approach to connect metal or other materials is to use reactive adhesives or epoxy. If we use the right adhesive with a bonding position professionally treated (cleaned, degreased), the joint will be completely sealed. It can suffer high mechanical and chemical load and can be used under a high temperature of 150 ℃. Because many products are used in the areas with high hygiene conditions such as in the pharmaceutical and food processing industries, the adhesive chosen must be authorized to prevent pollution caused by unavoidable contact.
To manufacture and assemble a high-quality stainless steel filter element or system, a dust-free environment must be required.