| 摘要 |
PURPOSE:To save the material at the time of material change by scraping thereof being attached to the inside of the head and improve the surface condition through the first-in and first-out method by means of a material passage groove to the storage chamber provided on the inner surface of the head-body or the wall surface of the plunger. CONSTITUTION:Material fed from a material feed inlet 10 is guided to vertical grooves along both sides through a distribution passage 11 and reaches a storage chamber 9. As the material accumulates, a plunger rises in such a manner that it is piled one upon another in sequence. The vertical groove 8 comes exposed above a plate 2 but there is no material attached to the groove of the exposed portion by the groove closing block 12. When the material accumulates up to the given amount, an injection cylinder 19 is driven to extrude the material through a nozzle 15 to form a parison 16. At this point, first-in and first-out action is made to ensure a molding of high quality. The vertical groove provided for the material passage allows the edge 7c to scrape off the material thereby eliminating the retention of the material. The high speed passage of the material through the vertical groove 8 with a limited attaching area can also eliminates retention of the material, thereby reducing the material for extruding away the proceeding material at the material change. |
