| 摘要 |
PURPOSE:To obtain a plastic extruding material with a smooth surface and without any cooling stripes by lowering the surface tension of cooling water through mixing interfacial active agent to cooling water for cooling extrusion member extruded from a extruder. CONSTITUTION:A covered electric cable (an extruding material) 2 formed by extrusion in an arrow direction from the die 1 of an extruder is cooled by pouring the cooling water 4 from a cooling water spouting device 3. The cooling water 4 is mixed with interfacial active agent. The interfacial active agent is specially preferable to liquid detergent in view of its dissolution. The mixing ratio is excellent in approximate 20PPM-1,000PPM. When it is below 20PPM, the effect is low, and above 1,000PPM, bad effects such as foam generation or the like may occur. The side of the die 1 on an upper surface of the covered electric cable 2 poured with cooling water 4 can be uniformly cooled minute by minute without forming any rising portion of cooling water, so that a plastic extrusion member with a smooth surface and without any cooling stripes can be produced. |
