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Fiberglass Production
Sep 21, 2017

The process of manufacturing fiberglass is called pultrusion.The manufacturing process for glass fibers suitable for reinforcement uses large furnaces to gradually melt the silica sand,limestone,kaolin clay,fluorspar,colemanite,dolomite and other minerals to liquid form.It is then extruded through bushings,which are bundles of very small orifices (typically 5–25 micrometres in diameter for E-Glass,9 micrometres for S-Glass).

These filaments are then sized (coated) with a chemical solution.The individual filaments are now bundled in large numbers to provide a roving.The diameter of the filaments, and the number of filaments in the roving, determine its weight,typically expressed in one of two measurement systems:

·yield,or yards per pound (the number of yards of fiber in one pound of material;thus a smaller number means a heavier roving).Examples of standard yields are 225yield, 450yield, 675yield.

·tex,or grams per km (how many grams 1 km of roving weighs, inverted from yield;thus a smaller number means a lighter roving).Examples of standard tex are 750tex,1100tex,2200tex.

These rovings are then either used directly in a composite application such as pultrusion,filament winding (pipe),gun roving (where an automated gun chops the glass into short lengths and drops it into a jet of resin,projected onto the surface of a mold),or in an intermediary step,to manufacture fabrics such as chopped strand mat (CSM) (made of randomly oriented small cut lengths of fiber all bonded together),woven fabrics,knit fabrics or uni-directional fabrics.



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