| 摘要 |
PURPOSE: To obtain a tubular die capable of heating and cooling a temperature- control sectors with a simple method by sectioning either one of an inner ring or an outer ring into a plurality of temperature-control sectors, and placing electrical heating cartridges in bores or recesses. CONSTITUTION: An annular die gap 3 is formed between a central core 1 and an outer ring 2 of a tubular die. The outer ring 2 is provided with bores 4 which are placed leaving a space along its periphery, and the bores 4 is arranged to receive heating cartridges 5 to be inclined. After the heating cartridges 5 are inserted, the upper edges of the cartridges 5 are sealed by plugs 6 which are welded at predetermined positions. Electrical lead wires 7 are connected the bores 4 through the radial bores. Where the temperature-control segments are heated, electrical power is supplied to the heating cartridges, and where cooling effects are required, the electrical power is not supplied to the heating cartridges, whereby the temperature-control segments are reduced down to a mass temperature of molten resin flowing from the tubular die. |
