| 摘要 |
A fishing line (6, 13, 14) is of thermoplastic material or at least has a coating of such material. Initially it is of constant cross section. A taper is applied by heating a length to soften the plastics, and then moving that length away from the heat one end first while maintaining the length under tension. The tension stretches the line and reduces its thickness before it hardens. The first portion to escape the heat sets quickest and reduces in thickness least, while the last portion, being subject to tension the longest, is stretched and thinned the most. The heat source may be a bath (1, 7) of heated liquid (2, 9) in which the line is initially immersed. |
