| 摘要 |
PROBLEM TO BE SOLVED: To provide an efficient production method for a multicolor stick type material with a color tone different in an axial direction in which a boundary line between different core materials is clear and a color tone mixture portion is hardly formed in the core material.SOLUTION: The invention relates to a production method, in which each nozzle 4c and 4d discharging molten materials C and D of each color tone is inserted into a gathering shaft tube 3 from the upper part, the molten materials C and D of each color tone are discharged one by one from each of the nozzles 4c and 4d while the nozzles are pulled up to fill the shaft tube 3, and a boundary line between core materials 1 and 2 arranged in a line and having color tones different in an axial direction becomes clear by discharging the molten material D of another color tone before the shrink of the molten material C having a certain color tone which is previously filled starts; and the molten materials C and D are discharged while the nozzles 4c and 4d are pulled up, the molten materials C and D become difficult to splash by arranging the nozzles 4c and 4d close to the molten materials C and D, and further, a production time can be shortened as compared with conventional methods comprising waiting for the solidification to discharge, by discharging the molten material D of another color tone without waiting for the solidification of the molten material C of a certain color tone. |
