| 摘要 |
PROBLEM TO BE SOLVED: To provide an extrusion die head which is mounted at the apex of an extruder and extrudes a molten resin material in a solid state, and further, can effectively avoid such a trouble that the molten resin material to be extruded from an opening of the extrusion die head, tends to curve in an indefinite direction, without being forced to undergo complicated remedial steps. SOLUTION: This extrusion die head comprises a die head body 20 with an opening 30 through which the resin material is extruded and a core 10 to be fitted to the interior of the die head body 20. In addition, at least, a single strip of helical groove (11a and 11b), is nicked along the surface of the core 10. Besides, the helical groove (11a and 11b) becomes gradually shallow toward the apex side of the core 10, and an air space is formed between the inner peripheral surface of the die head body 20 and the core 10 in such a way that an interval between the inner peripheral surface of the die head body 20 and the core 10 gradually widens toward the opening 30. COPYRIGHT: (C)2008,JPO&INPIT
|
