Container and method of fabrication thereof

Abstract

A method for fabricating a lid or a base of a container, the lid or base comprising a web and an outer boundary, the method comprising injecting a plastic material through at least a first number of first cavities having a first thickness and through at least a second number of second cavities having a second thickness, the first cavities leading to the outer boundary of the lid or base, the first thickness being larger than the second thickness; and selectively cooling the first cavities and the second cavities.

1 . A method for fabricating an end wall of a container, the end wall comprising a web and an outer boundary, the method comprising injecting a plastic material through at least a first number of first cavities having a first thickness and through at least a second number of second cavities having a second thickness, the first cavities leading to the outer boundary of the end wall, the first thickness being larger than the second thickness; and selectively cooling the first cavities and the second cavities. 
     
     
         2 . The method of  claim 1 , wherein the first cavities lead to corners of the end wall. 
     
     
         3 . The method of  claim 1 , comprising selecting the first and the second thickness depending on at least one of: the plastic material, the size of the web, and a thickness of lateral walls of the container. 
     
     
         4 . An end wall of a container, the end wall comprising first parts of a first thickness and second parts of a second thickness, said first thickness being larger than said second thickness, said first parts being connected to an outer circumferential boundary of the end wall. 
     
     
         5 . The end wall of  claim 4 , wherein said first parts are connected to corners of the end wall. 
     
     
         6 . The end wall of  claim 4 , comprising a web extending into the outer circumferential edge of the end wall. 
     
     
         7 . The end wall of  claim 4 , wherein said outer circumferential edge comprises a circumferential flange. 
     
     
         8 . The end wall of  claim 4 , comprising a web extending into the outer circumferential boundary of the end wall, said outer circumferential boundary comprising a skirt generally perpendicular to the web. 
     
     
         9 . The end wall of  claim 4 , wherein said second parts are positioned on a surface of the end wall generally configured to face the outside of the container. 
     
     
         10 . The end wall of  claim 4 , wherein said second parts are positioned on a surface of the end wall generally configured to face the inside of the container. 
     
     
         11 . The end wall of  claim 4 , wherein said second parts are positioned on at least one of: i) a surface of the end wall generally configured to face the inside of the container and ii) a surface of the end wall generally configured to face the outside of the container. 
     
     
         12 . The end wall of  claim 4 , wherein said end wall is a lid. 
     
     
         13 . A combination of a container and a lid therefor, the container comprising a lateral wall extending up from a bottom wall to an upper rim, wherein at least one of: i) said bottom wall and ii) said lid comprises first parts of a first thickness and second parts of a second thickness, said first thickness being larger than said second thickness, said first parts being connected to an outer circumferential boundary of the at least one of: i) said bottom wall and ii) said lid. 
     
     
         14 . The combination of  claim 13 , said container being one of a square or rectangle container, at least one of: i) said bottom wall and ii) said lid comprising corners, wherein said first parts are connected to said corners. 
     
     
         15 . The combination of  claim 13 , wherein said second parts make up to about 80% of a surface area of a web of at least one of: i) said bottom wall and ii) said lid. 
     
     
         16 . The combination of  claim 13 , wherein said second parts make up between about 20% and about 60% of a surface area of a web of at least one of: i) said bottom wall and ii) said lid. 
     
     
         17 . The combination of  claim 13 , wherein said at least one of: i) said bottom wall and ii) said lid comprises a first surface configured to face the inside of the container and a second opposite surface configured to face the outside of the container, wherein a pattern comprising said first part and said second parts is formed on at least one of said first and second surfaces. 
     
     
         18 . The combination of  claim 13 , wherein said at least one of: i) said bottom wall and ii) said lid comprises an outer circumferential edge, said outer circumferential edge web having the first thickness.