A device for coating a fiber includes a fiber receiving arrangement and a coating arrangement which includes an application unit which wets the fiber with a coating agent, and a curing unit arranged downstream of the application unit which optically cures the coating agent. The curing unit includes a lamp which emits at least one light beam which is aimed directly or indirectly at a surface of the fiber. A main radiation direction of the lamp includes a beam angle between the main radiation direction and a longitudinal direction of the fiber of less than 40°. The fiber receiving arrangement and the application unit are movable relative to each other in the longitudinal direction of the fiber via a translational motion arrangement so that a wetting process is implemented substantially along an entire length of the fiber.

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.

A glass fiber according to the present invention is suitable for preventing filament breakage and suitable for being stably produced for a long term, and has a β-OH value of 0.02 mm.sup.−1 or more and less than 0.55 mm.sup.−1. The preferred content of SO.sub.3 is more than 0 ppm and 70 ppm or less on a mass basis. The glass fiber is preferably substantially free of As and Sb. SO.sub.3 can be supplied to a glass raw material as, for example, a sulfuric acid salt of an alkali metal or an alkaline-earth metal.

An electronic-grade glass fiber composition includes the following components with corresponding amounts by weight percentages: 54.2-60% SiO.sub.2, 11-17.5% Al.sub.2O.sub.3, 0.7-4.5% B.sub.2O.sub.3, 18-23.8% CaO, 1-5.5% MgO, less than or equal to 24.8% CaO+MgO, less than 1% Na.sub.2O+K.sub.2O+Li.sub.2O, 0.05-0.8% TiO.sub.2, 0.05-0.7% Fe.sub.2O.sub.3, and 0.01-1.2% F.sub.2. The weight percentage ratio C1=SiO.sub.2/(RO+R.sub.2O) is greater than or equal to 2.20, and the total weight percentage of the above components is greater than or equal to 98.5%.

Described herein are coated optical fibers including an optical fiber portion, wherein the optical fiber portion includes a glass core and cladding section that is configured to possesses certain mode-field diameters and effective areas, and a coating portion including a primary and secondary coating, wherein the primary coating is the cured product of a composition that possesses specified liquid glass transition temperatures, such as below 82 C., and/or a viscosity ratios, such as between 25 C. and 85 C., of less than 13.9. Also described are radiation curable coating compositions possessing reduced thermal sensitivity, methods of coating such radiation curable coating compositions to form coated optical fibers, and optical fiber cables comprising the coated optical fibers and/or radiation curable coating compositions elsewhere described.

A formaldehyde-free binder composition for mineral fibers which comprises at least one phenol containing compound and at least one protein.

An aqueous binder composition for mineral fibers which comprises at least one polyelectrolytic hydrocolloid.

An optical fiber draw system and method of coating an optical fiber. The system includes a furnace for heating an optical fiber preform, a draw assembly for drawing the optical fiber at a draw speed greater than 50 meters per second, a first coating applicator for applying a first coating onto the fiber, and a first curing assembly comprising a first plurality of light sources comprising light-emitting diodes for partially curing the first coating. The optical fiber draw system also includes a second coating applicator for applying a second coating onto the fiber on top of the first coating, and a second curing system comprising a second plurality of light sources for curing the second coating, wherein the first coating is further cured in the range of 15-50 percent after leaving the first curing assembly.

This invention relates to a method for manufacturing a mineral wool board, comprising the following steps in the given order: providing mineral wool fibers having a fiber length of 50 to 800 m; gluing the fibers with a liquid binder comprising phenolic resin, whereby the ratio of binder (based on the solids content of the resin of the binder) to mineral wool fibers is 5 to 30% by weight, and pressing the glued fibers using heat and pressure.

A composition for producing a glass fiber, including the following components with corresponding percentage amounts by weight: SiO.sub.2: 57.4-60.9%; Al.sub.2O.sub.3: greater than 17% and less than or equal to 19.8%; MgO: greater than 9% and less than or equal to 12.8%; CaO: 6.4-11.8%; SrO: 0-1.6%; Na.sub.2O+K.sub.2O: 0.1-1.1%; Fe.sub.2O.sub.3: 0.05-1%; TiO.sub.2: lower than 0.8%; and SiO.sub.2+Al.sub.2O.sub.3: lower than or equal to 79.4%. The total weight percentage of the above components in the composition is greater than 99%. The weight percentage ratio of Al.sub.2O.sub.3+MgO to SiO.sub.2 is between 0.43 and 0.56, and the weight percentage ratio of CaO+MgO to SiO.sub.2+Al.sub.2O.sub.3 is greater than 0.205. The composition can significantly increase the glass modulus, effectively reduce the glass crystallization rate, secure a desirable temperature range (T) for fiber formation and enhance the refinement of molten glass, thus making it particularly suitable for high performance glass fiber production with refractory-lined furnaces.