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US 4,362,495 AGranted
Extrusion device for forming a honeycomb structure
AssigneeNippon Soken, Inc.
InventorsJunichiro Naito, Shinichi Yamamoto, Zituo Suzuki, Mitsuru Asano
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Abstract
An extrusion device comprises a die provided with feed passageways and grid-shaped extrusion slots of which width is made larger in the outer peripheral portion compared with those of the central portion of the die. By the above extrusion device, a honeycomb structure having a thicker walled outer peripheral portion can be obtained without any distortion.
Claims9
An extrusion device for forming a honeycomb structure provided with a large number of axially extending open passages which are separated by thin wall, out of an extrudable material, comprising:
- a die provided with a large number of disconnected feed passageways which are formed on an extrudable material inlet side thereof in the axial direction thereof, and a large number of interconnected grid-shaped extrusion slots which are formed on an extrudable material outlet side thereof and communicated with said feed passageways;
- and
- a cylindrical die mask disposed on said outlet side and having a central aperture coaxial with said die,
- said mask being disposed to cover an outer ring of extrusion slots with said aperture leaving uncovered an inner circular area of extrusion slots,
- the uncovered extrusion slots in the outer peripheral portion of said inner circular area having a width larger than those of the central portion of said circular area,
- the arrangement being such that extrudable material fed to the covered outer ring of extrusion slots is caused to flow laterally to the said uncovered wider extrusion slots via the said interconnection thereof and axially outwardly through said wider slots to aid in providing a continuous homogenous honeycomb structure.
3 more elements
Dependencies are inferred from the claim text.