Polypropylene pp spunbond fabrics are produced by depositing extruded, spun filaments onto a collecting belt in a uniform random mannerfollowed by bonding the fibers. The fibers are separated during the web laying process by air jets or electrostatic charges. Thecollecting surface is usually perforated to prevent the air stream from deflecting and carrying the fibers in an uncontrolledmanner. Bonding imparts strength and integrity to the web by applying heated rolls or hot needles to partially melt the polymerand fuse the fibers together. Since molecular orientation increases the melting point, fibers that are not highly drawn can beused as thermal binding fibers. Polyethylene or random ethylene-propylene copolymers are used as low melting bonding sites.Hydrophob filter  spunbond products are employed in carpet backing, geotextiles, and disposable medicalhygiene products. Since the fabricproduction is combined with fiber production, the process is generally more economical than when using staple fiber to make 100% polypropylene  nonwoven fabrics.