Fiberglass cap-style filter is cut and thermal formed by fiberglass filter cloth that weaved by special high-twist & high-strength alkali-free fiberglass yarn, coated with special resin and produced by special post-treatment. The maximum temperature resistance can reach 900 ℃.

Fiberglass cap-style filter production process

Hot press molding   &   Sides scrap

Cap type fiberglass filter mesh is usually a network structure, which is a non-metallic liquid metal purification device with the required mesh opening. Its porosity is higher, the slag collection surface area is larger, and it can reduce the the Reynolds number of the mesh metal surface flowing through the cast filter, then it can make the filler be more stable and reduce the production of secondary oxidation slag in the mold.

The usage of cap type fiberglass filter mesh can effectively remove liquid metal and non-metallic inclusions, improve the structure and mechanical properties of castings, improve the high quality standards of precision castings production and reduce the rate of casting defects. It can also reduce tool wear during machining and significantly improve efficiency. In addition, it can reduce porosity in the casting, reduce surface defects and reduce casting and filling lines, significantly increasing the process yield, which is much better than high silicon screen casting filters and cast filter products with straight holes.

For some castings that require high surface quality and good densification, in order to prevent inclusions and improve the internal quality of the castings, it is very necessary to install a cap type fiberglass filter mesh in the gate system. Especially in the field of small and medium-sized castings such as automobiles, high-speed railways, machine tools and hydraulic parts, the purification effect of the cap filter mesh has been widely recognized by most foundry workers.

Purification mechanism of cap type fiberglass filter mesh:

1. Since the cap fiberglass filter mesh is placed at the bottom of the gate of the sprue cup, runner or sand mold, the molten metal injected from the sprue cup into the cavity can stay momentarily while passing through the position. The slag can be the main small-density inclusions floating and separating from the molten metal. These inclusions also produce deep adsorption when they pass through regular or irregular grids. This phenomenon can continue to purify molten metal before the pouring cup is filled.

2. The role of surface filtration: Surface filtration is a common metal liquid purification function of all casting filters. When the molten metal passes through the casting filter, unfloated or floating inclusions with a relatively large surface area, such as molten slag, are captured by the surface of the casting filter. In addition, the captured inclusions will form a finer filter eye with the cast filter continue trapping subsequent inclusions, thus enhancing the filtration effect. However, at the same time of this surface filtration, with the decrease of the pouring temperature and the increase of the viscosity of the molten metal, as well as the extension of the pouring time, the cap filter mesh will be blocked to varying degrees, thus make filtering effect be worse.

So, the cap filter mesh should be replaced with a new one according to actual casting scenario to keep its best filtering effect.

We, Hebei CangChen, have more than 18 years production experience for such cap filters. Our cap filters has been exported to many countries for the applications of foundries. And our cap filters has been certified by SDS. There are strict quality inspections in our factory, all dimensions and mesh opening can be customized just according to your samples and drawings.

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