| 摘要 |
The initial ribbon (1) comprises several fibres within a sheath (3) of a conventional polymerisable resin with relatively high Young modulus. In forming a multiple ribbon, a good adherence between the initial sheathing and the overall sheathing (6) is obtained and a preferential fracture line (8) is created between the initial ribbons which in general contain 2, 4, 6 or 12 fibres. |
