Abstract: Disclosed herein is a glass composition including, based on a total weight of the glass composition, 49 wt % to 59 wt % of SiO2, 9.5 wt % to 14.5 wt % of Al2O3, 19 wt % to 35 wt % of B2O3, 2 wt % to 5 wt % of CaO, 0.25 wt % to 3 wt % of ZnO, 0 wt % to 1 wt % of MgO, 0 wt % to 1 wt % of TiO2, 0 wt % to 3 wt % of ZrO2, and 0.1 wt % to 3.5 wt % of MnO. Also disclosed herein are a glass fiber and a glass article which include the glass composition.

Abstract: Disclosed herein is a glass composition that includes, based on a total weight of the glass composition, 55 wt % to 64 wt % of SiO2, 15 wt % to 22 wt % of Al2O3, 0.1 wt % to 4 wt % of CaO, 2.1 wt % to 10 wt % of MgO, 0 wt % to 8 wt % of ZnO, greater than 0 wt % and less than 7 wt % of CuO, and greater than 13.1 wt % and less than 18 wt % of B2O3. Also disclosed herein are a glass fiber and a glass article including the glass composition.

Abstract: Disclosed herein is a glass composition that includes, based on the total weight of the composition, 52 wt % to 58 wt % of SiO2, 12 wt % to 16 wt % of Al2O3, 16 wt % to 26 wt % of B2O3, greater than 0 wt % and not greater than 2 wt % of MgO, 1 wt % to 6 wt % of CaO, greater than 1 wt % and lower than 5 wt % of TiO2, greater than 0 wt % and not greater than 0.6 wt % of Na2O, 0 wt % to 0.5 wt % of K2O, 0 wt % to 1 wt % of F2, 1 wt % to 5 wt % of ZnO, greater than 0 wt % and not greater than 1 wt % of Fe2O3; and 0.1 wt % to 0.6 wt % of SO3. Also disclosed herein is a glass fiber including the glass composition.

Abstract: Disclosed herein is a glass composition that includes, based on the total weight of the composition, 52 wt % to 58 wt % of SiO2, 12 wt % to 16 wt. of Al2O3, 16 wt % to 26 wt % of B2O3, greater than 0 wt % and not greater than 2 wt % of MgO, 1 wt % to 6 wt % of CaO, greater than 1 wt % and lower than 5 wt % of TiO2, greater than 0 wt % and not greater than 0.6 wt % of Na2O, 0 wt % to 0.5 wt % of K2O, 0 wt % to 1 wt % of F2, 1 wt % to 5 wt % of ZnO, greater than 0 wt % and not greater than 1 wt % of Fe2O3; and 0.1 wt % to 0.6 wt % of SO3. Also disclosed herein is a glass fiber including the glass composition.

Abstract: A twisting device having a pair of fiber cakes that are simultaneously hung on a transversely disposed creel, respectively unwind two fiber strands downwardly during the rotation process of the creel. Each of the two fiber strands passes through a strand-cut sensor and then enter a balloon control ring. Through the guide of an oil ring, each of the fiber strands is twisted and then wound around a bobbin driven by a spindle motor. The pair of balloon control rings and the pair of oil rings are simultaneously driven by a ring rail to move upward and downward on the bobbin.

Abstract: The present invention proposes a twisting device having enhanced productivity. A pair of fiber cakes are simultaneously hung on a transversely hung creel. The pair of fiber cakes respectively unloosen two fiber strands downwards during the rotation process of the creel. Each of the two fiber strands passes through a strand-cut sensor and then enters a balloon control ring. Through the guide of an oil ring, each of the fiber strands is twisted and then wound around a bobbin driven by a spindle motor. The pair of balloon control rings and the pair of oil rings are simultaneously driven by a ring rail to move upwards and downwards on the bobbin. Therefore, a pair of fiber strands and a pair of bobbins can use the same creel, thereby doubling the productivity per unit time per unit ground area.