Methods and apparatus for producing fibers from igneous rock, including basalt include heating igneous rock by electrical conductive coils to achieve an homogenous melt and forming homogenous fibers from the melt.

Methods and apparatus for producing fibers from igneous rock, including basalt include heating igneous rock by electrical conductive coils to achieve an homogenous melt and forming homogenous fibers from the melt.

A highly temperature-resistant glass fiber and a preparation method therefor. The glass fiber comprises 62-66 wt % of SiO.sub.2, 14-19 wt % of Al.sub.2O.sub.3, 15-20 wt % of CaO, 0-2 wt % of MgO, 0-3 wt % of Fe.sub.2O.sub.3, and 0-1.2 wt % of TiO.sub.2, the total content of Na.sub.2O and K.sub.2O is 0.1-0.8 wt %. By precisely controlling the mixture of the components, the glass fiber has good resistance to high temperature and formability, and significantly increases the high-temperature softening point. The glass fiber has a forming temperature of not exceeding 1380° C., an upper limit temperature of devitrification of lower than 1280° C., and a high temperature softening temperature of 950° C. or above.

Methods and apparatus for producing fibers from igneous rock, including basalt include heating igneous rock by electrical conductive coils to achieve an homogenous melt and forming homogenous fibers from the melt.

Methods and apparatus for producing fibers from igneous rock, including basalt include heating igneous rock by electrical conductive coils to achieve an homogenous melt and forming homogenous fibers from the melt.

There is provided a system and method for manufacturing continuous strand fiberglass of progressive density with varying skins. Glass media is melted into molten glass within a temperature controlled melter, the molten glass exits the melter through orifices of a bushing plate, which is oriented 6 degrees relative to the axis of a rotating drum. A rotating drum receives the molten glass exiting the bushing plate, and resin and water are applied. The fiberglass media is fed through rollers before it enters a curing oven.

A highly temperature-resistant glass fiber and a preparation method therefor. The glass fiber comprises 62-66 wt % of SiO.sub.2, 14-19 wt % of Al.sub.2O.sub.3, 15-20 wt % of CaO, 0-2 wt % of MgO, 0-3 wt % of Fe.sub.2O.sub.3, and 0-1.2 wt % of TiO.sub.2, the total content of Na.sub.2O and K.sub.2O is 0.1-0.8 wt %. By precisely controlling the mixture of the components, the glass fiber has good resistance to high temperature and formability, and significantly increases the high-temperature softening point. The glass fiber has a forming temperature of not exceeding 1380 C., an upper limit temperature of devitrification of lower than 1280 C., and a high temperature softening temperature of 950 C. or above.

The present invention is directed to a vertical volcanic rock melting furnace having a reduced spatial footprint relative to prior art furnaces. The melting furnace includes a top melting section, which raises the temperature of a charge above the liquidus temperature, a middle cooling section configured to reduce the temperature of the melt, and a bottom conditioning section configured to maintain the melt above a crystallization temperature before the melt is distributed to one or more bushing plates to extrude into fibers. The top melting section and the bottom conditioning sections are surrounding by induction coils for inductively raising the temperature of the melt.

A bushing system may include a bushing that is configured to receive a molten material. The bushing may include a plate defining a first plurality of apertures through which the molten material flows. The plate may include a longitudinal axis, as well as a first side wall and a second side wall disposed on a side of the plate opposite the first side wall. The first side wall and the second side wall may extend at an upward angle from the plate. The plate may also include a plurality of ribs extending along at least a portion of the plate. The bushing system may also include a tip plate coupleable with the bushing. The tip plate may be configured to receive the molten material from the bushing and may define a second plurality of apertures through which the molten material flows to form fibers.

A system and a method of manufacturing continuous glass filament fiberglass media comprises melting glass within a temperature controlled melter. Molten glass exits through a bushing plate with orifices of varying row configurations and orientations. The resulting fiberglass filaments are received on a rotating drum and sprayed with resin and aqueous solution. The resulting fiberglass mat is placed onto a let-off table then sprayed with aqueous solution before further processing.