Filter Bag and Combo Bag glass cloth filter for aluminium fi

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During aluminum casting, it is common practice to use the filter bag made from the heat-resistant glass fiber fabric, in order to filter the molten aluminiuim that is being poured through a spout, and to distribute it all over the mold surface. The shapes and dimensions of the filter bag depend on the molding technology and the casting parameters.Presently, there are mainly two different types of bags used in the aluminium metallurgical industry.

The first type of glass cloth filter include bags of large sizes that are made of a fine mesh glass fiber fabric. These bags are often called "channel bags" . The channel bag in the form of a rectangular pan which is made of an open weave heat-resistant fabric, preferably an open weave fabric made of glass fibers, whose purpose is to let the molten metal flow down into the mold. The pan is provided with reinforcing bands or areas made of adense heat-resistant fabric. These reinforcing areas extend over the bottom and some portions of the sides of the pan and gives extra-strength and rigidity to thebottom of the pan. The bag can be attached under the pouring spot with a set of rods inserted into hems provided for this purpose on the lateral sides of the pan.

The second type of bags for aluminium filtration used in the industry include bags of much more complex structure, which are made of several parts of fiberglass fabrics sewn to each other. These bags called "combo bags" in the industry,are usually smaller in dimensions than the channel bags and mostly used with automatic casting control.