| 摘要 |
An extrusion die is used for producing a honeycomb structures. The extrusion die is composed of a guide ring and a die body part. Feeding holes and slit grooves are formed in the die body part. The guide ring has a pole part and a guide part. A slit groove formation area has a central slit groove formation surface area having a step shaped part and an outer peripheral slit groove formation area. An angle of the step-shaped part to an outer slit groove formation surface is within a range of 90°<=alpha<=95°, and a relationship A<=B<1.5 A is satisfied, where A is a gap between the outer peripheral slit groove formation surface to the guide part, and B is a gap between the outer peripheral side surface of the step shaped part and the front end of the guide part.
|
