Methods for substrate retention

Abstract

Disclosed herein are methods of substrate retention properties utilizing compression features. In one embodiment a method for producing compression features comprises: assembling a mat around a substrate to form a substrate/mat sub-assembly, disposing the mat/substrate sub-assembly within a shell to form a retention assembly, and forming a compression feature on an outer surface of the retention assembly.

1 . A method for producing an exhaust treatment device, comprising: 
 assembling a mat around a substrate to form a substrate/mat sub-assembly;    disposing the mat/substrate sub-assembly within a shell to form a retention assembly; and,    compressing a portion of the mat by forming a compression feature on an outer surface of the retention assembly.    
     
     
         2 . The method of  claim 1 , further comprising; 
 measuring a force exerted on the substrate by the compressed mat;    determining if the measured force is less than a desired force;    if the measured force is less than the desired force, forming subsequent compression feature(s) on the outer surface until the desired force is exerted on the substrate.    
     
     
         3 . The method of  claim 1 , further comprising; 
 measuring a process variable; and,    controlling the formation of the compression feature based on the measurement of the process variable.    
     
     
         4 . The method of  claim 3 , wherein the controlling of the formation further comprises controlling the depth of the compression feature.  
     
     
         5 . The method of  claim 3 , wherein the controlling of the formation further comprises controlling the number of the compression feature(s).  
     
     
         6 . The method of  claim 3 , wherein the controlling of the formation further comprises controlling the location of the compression features.  
     
     
         7 . The method of  claim 3 , wherein the controlling of the formation further comprises controlling the geometry of the compression features.  
     
     
         8 . A storage medium encoded with a machine readable computer program code, said code including instructions for causing a computer to implement a method for producing an exhaust treatment device, the method comprising: 
 assembling a mat around a substrate to form a substrate/mat sub-assembly;    disposing the mat/substrate sub-assembly within a shell to form a retention assembly;    compressing a portion of the mat by forming a compression feature on an outer surface of the retention assembly;    measuring a process variable; and,    controlling the formation of the compression feature based on the measurement of the process variable.