Production Process of Fiberglass Cap Filters for Aluminum Casting Refractory Material

The cap-style is woven with special high-twist & high-strength alkali-free fiberglass yarn, coated with special resin and produced by carbonizing by special high temperature.

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.

It is widely used in automobile and motorcycle wheels, cylinder pistons, aluminum rods, aluminum materials, aluminum ingots, aluminum plates and precision casting of all types of aluminum alloy casting. 

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.

The maximum temperature resistance can reach 900 ℃.

Let's see how this fiberglass cap filter is produced in our factory!

The First step is to weave fiberglass cloth according to dimensions and mesh opening.

Fiberglass Fabric Filter Cloth is specially developed and used for filtration, turbulence reduction and flow distribution improvement of non-ferrous alloys especially the molten aluminum. 

Fiberglass Filter Cloth is weaved by alkali-free E-glass fiberglass yarn.

The Second is to cut into different pieces according to requested dimensions.

Different dimensions of fiberglass cap filters are customized for each clients, so, different small pieces are cut in advance to prepare to produce cap filters.

The Third is to produce filters by customized mould.

The Forth is to cut off the excess trimmings and scraps. To make the filters neat and orderly.

The Fifth is to coated with special phenolic resin to keep its stype and lines fixed. After this process, the white cap filters become yellow.

The Sixth is to be carbonized by high temperature for a period of time. 

This process is the most important step of all. Temperature degree and carbonized time are key points to decide the quality of cap filters.

The Seventh is to make package.

All cap filters can be packed just according to your own need.

With seven steps, fiberglass cap filters can be delivered to you by air or by sea.