Spun Para Aramid or virgin Kevlar® (Continuous Filament) round or square section ropes are used as a spiral wrap on the quench rolls of horizontal tempering ranges. Our para aramid and Kevlar® ropes and are used to help convey and protect the hot glass during the rapid cool down process. During the thermal tempering process glass is heated to temperatures nearing the melting point. Soon thereafter the glass exits the furnace and is rapidly quenched with cool air to strengthen it. As the glass exits the furnace it is conveyed over a series of cold metal rollers. These quench rollers are spirally wrapped with our spun para aramid or Kevlar® ropes to prevent the still hot glass from picking up unacceptable thermal cracks.
Spun (sometimes reffered to as discontinuous filament) para aramid fibres tend to be slightly more economical and made from recycled fibre. Their temperature rating is therefore slightly downgraded from Virgin Para Aramid fibre made from Duponts Kevlar® or Teijins Twaron® fibre.
We also manufacture to order ropes woven from Teijins Technora® fibre which can withstand higher temperatures still.