Blow molded plastic aerosol container

Abstract

A plastic container for holding aerosol contents under pressure includes a one-piece integrally molded plastic body having a base, a sidewall and a neck finish. The sidewall and the base are of oval cross-section, and the base has a contour and cross-section for maintaining the oval cross-section under aerosol pressure within the container body. The neck finish has an open mouth surrounded by a circumferentially continuous external bead for securing a dispensing closure. The bead has an undersurface that is perpendicular to an axis of the neck finish, and the neck finish has a chamferred inside edge around the open mouth to facilitate insertion of a dispensing closure.

1 . A plastic container for holding aerosol contents under pressure, which includes: 
 a one-piece integrally molded plastic body having a base, a sidewall and a neck finish, said sidewall and said base being of oval cross-section, and said base having a contour and cross-section for maintaining said oval cross-section under pressure within said body,    said neck finish having an open mouth surrounded by a circumferentially continuous external bead for securing a dispensing closure,    said bead having a flat undersurface perpendicular to an axis of said neck finish,    said neck finish having a chamferred inside edge around said open mouth to facilitate attachment of a dispensing closure.    
   
   
       2 . The container set forth in  claim 1  wherein said neck finish includes a support flange spaced from said external bead.  
   
   
       3 . The container set forth in  claim 2  wherein said support flange has a peripheral edge with at least one locating element for orienting said oval cross-section.  
   
   
       4 . The container set forth in  claim 3  wherein said at least one locating element is positioned on a minor axis of said oval cross-section.  
   
   
       5 . The container set forth in  claim 4  wherein said at least one locating element includes a pair of locating elements on opposed sides of said neck finish along said minor axis.  
   
   
       6 . The closure set forth in  claim 4  wherein said at least one locating element is a notch or a lug.  
   
   
       7 . The container set forth in  claim 1  wherein said base is a champagne base having a central outwardly convex portion and a peripheral standing ring.  
   
   
       8 . The container set forth in  claim 7  wherein said standing ring has a thickness that is 2 to 2.5 times the thickness of said sidewall.  
   
   
       9 . The container set forth in  claim 1  wherein said body is of multilayer construction including at least one relatively thick layer of a first material, and at least one relatively thin layer of a second material having a higher glass transition temperature than said first material for retaining the oval cross-section of the container body.  
   
   
       10 . A method of making a plastic container that includes the step of blow molding a one-piece plastic body having a base, a sidewall and a neck finish, said sidewall and said base being of oval cross-section, and said base having a contour and cross-section for maintaining said oval cross-section under pressure within said body, 
 said neck finish having an open mouth surrounded by a circumferentially continuous external bead for securing a dispensing closure,    said bead having a flat undersurface perpendicular to an axis of said neck finish,    said neck finish having a chamferred inside edge around said open mouth to facilitate attachment of a dispensing closure.