无捻粗纱twistless roving
定义：无捻粗纱是玻璃钢基材的最基本形式，由多股平行的原丝拼合而成的粗纱（多股原丝无捻粗纱）或由一次拉制的多根单丝直接集束而成的粗纱(单股无捻粗纱).不同的无捻粗纱通过喷射、模压成型、缠绕等方式与聚酯或环氧树脂结合，形成高强度的玻璃刚制品。
Definition: Twistless roving is the fundamental mode of FGR. The twistless strand (Multi-fiber twistless roving) is pieced together from multiple parallel strand or from the multi-cluster strand which is put together directly by roving. The different kind of roving can be combined with polyester and epoxy through injection, molding, winding and so on, to form the FRP which has the high-strength.