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Fig.1: Thanks to optimized geometry, UDICELL™ tubular filters are well suited for filtering large volumes of liquid ferrous metals.

Tubular Foam Ceramic Filters

Feb. 4, 2014
Reduced risk of fracture Value-added design Universal housing

Due to casting buyers’ increasing quality demands, especially for large and heavy-section castings, effective — and above all safe — filtering processes during casting have become essential. Using traditional filters in a standard round or square plate shape, however, led to restrictions and safety risks that manifest themselves in the form of filter fractures. Through extensive research and development, ASK Chemicals succeeded in modifying the filter geometry – now including ceramic foam filters in a tubular design to prevent the above-mentioned restrictions and risks.

Fig. 2: The universal housing is recommended for both iron and steel casting.

Initial attempts in the product development, together with a German foundry, showed significant advantages over conventional plate-shaped filters. The risk of filter fractures was significantly reduced, while at the same time handling was simplified, and an increase in effective filter area was created. In addition, the end faces of the tubular filters are completely closed by using the same material, so that a breaking of the upper and lower edges and the risk of inclusions of the filter material in the mold cavity are effectively eliminated.

Simultaneously, because of its extremely compact design, the new filter is structurally strong. Tests have shown that the filter structure during a load of several tons of liquid metal had absolutely no distortion, deformation, or cracks.

The UDICELL tubular foam ceramic filters are perfectly suitable for secure filtering of large quantities of liquid metal and feature a distinctive, value-added design. The advantages of this design include more than three times the filter area compared to a conventional plate-shaped filter of the same size, a self-supporting geometry, a minimized risk of filter breakage, a compact structure, and a quick and easy installation.

In addition, a universal housing for this filter type has been developed that can be used both in iron and steel casting. The geometry of the tubular filter was exploited by designing a very small and compact housing. This concept includes the use of only one tubular filter per housing, reducing the complexity and number of components necessary for effective filtration while improving the safety and stability of the system.

Based on the superior design of the tube filter and housing, the risk of filter breakage is practically eliminated. With this complete system, the metalcaster has a safe, easy-to-use, and effective tool for filtering large amounts of liquid metal.

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