Method for forming a uniform skin on a cellular substrate

Details Method for forming a uniform skin on a cellular substrate Method for forming a uniform skin on a cellular substrate

1990-11-30

1993-06-15

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264173, 26417714, B29C 4706

Patent

active

052195090

ABSTRACT:
A method and apparatus for forming a skin on an extruded honeycomb structure, wherein detrimental distortion of the peripheral cells is eliminated to thus provide a virtually distortion free honeycomb structure with an integral skin. Batch material is supplied for forming the central cellular structure, and a metered flow of skin-forming batch material is transitioned from a predominantly transverse flow to a predominantly longitudinal flow so as to minimize the distortion of web portions of the peripheral cells. In addition, the skin-forming batch material is subjected to a first or primary flow path reduction in the form of flow depth and then, as it is knitting with peripheral web portions of the central cellular structure, it is subjected to a second or secondary flow path reduction in the form of reduced cross-sectional area, so as to effect a complete knitting thereof while still within the extrusion die. A unitary cellular structure with an integral skin is then discharged from the die with improved structural and strength characteristics.

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