To provide a breaker plate for an extruder obtaining an extrudate having desired quality/transparency without causing a clogging or stagnation.
The molten plastic A plasticized and melted by the extruder 8 is filtered by a mesh-like screen 2 and allowed to flow in the respective orifice parts 1a, etc. and respective orifice parts 1b, etc. of the breaker plate 1. The respective orifice parts 1b, etc. of the outer peripheral part F of the breaker plate 1 have an orifice size larger than that of the respective orifice parts 1a, etc. of the central part E of the breaker plate 1 and the extrusion amount of the molten plastic A extruded from the respective orifice parts 1b, etc. becomes larger than that of the molten plastic A extruded from the respective orifice parts 1a, etc. The molten plastic A ready to stagnate in the vicinity of the outer peripheral part on the downstream side of the breaker plate 1 is forcibly or positively transferred toward a downstream passage 5b by the molten plastic A extruded from the respective orifice parts 1b, etc.
Motoaki Nagata
Hironori Nishihara