| 摘要 |
PURPOSE:To provide a method of producing a slot with a groove which has high dimensional precision and no possibility of any changes with time and which can be secured throughout the entire length of the slot. CONSTITUTION:In a first step, tension members 4 are fed to a specified position of an extruder 7 through a guide 6, and high-density polyethylene in a molten state is extruded onto the outer periphery of the tension members through profile dies to coat them into a specified shape. Thereafter, the tension members are introduced immediately into a cooling tank 8, in which sizing and cooling are applied to the tension members by using sizing dies having a specified shape. In a second step, the tension members are allowed to pass through a heat treatment furnace 9 of a hot-air generator, which has 160 deg.C at a preset temperature, 100 deg.C at an inlet temperature and 110 deg.C at an outlet temperature, and immediately thereafter, groove sizing is performed by a sizing device 10 with the aid of a rectangular column-like sizing key conforming to a groove size. On the other hand, A Teflon bar having a diameter of 15 mm is allowed to abut against the outer periphery of a connected part to adjust the shape of the tension members, which are then hauled off at a haul-off speed of 5m/min by a haul-off gear 12 having a dancer roll 11 provided in each of the fore and rear positions of side gear and are further wound up by a winder 13. |
