Through a covered tunnel fill the furnace with basalt stones measuring approximately 50 to 100 mm in diameter.
Maintain the furnace temperature between 1300 oC and 1450 oC
In here the basalt stones are plasticized , melted and liquefied.
Maintaining a precise pressure , pass the liquefied yellow-red basaltic melt through a heated feeder tube and into the bushing. As the melt is forced through the bushing nozzles ,razor-thin , hair-fine basalt fibers are formed.
In order to ensure a uniform manufacturing process , the continuous fibers are coated with a size., which facilitates the textiles process and serves as a bonding agent between the fiber and the matrix. The size is specially developed for this process and will be adapted for specific applications.
Finally , the finished basalt fibers are drawn over a winder and wound onto a so-called spinning cake .
As a raw material for further processing for use in a variety of applications, the rovings are the most diverse nuances.