Tube shoulder and method for its manufacture

Abstract

A multilayer tube shoulder and method for manufacture wherein a first material component is injected into a cavity ( 22 ) and then removed from the cavity on a support ( 12 ) while in a partly-plastic state. Thereafter, following insertion of the first material component into a second cavity ( 23 ), a second material component is injected around the first material component, and thereby leads to a positive connection between the first and second material components.

What is claimed is:  
     
         1 . A mold ( 10 ) for manufacturing a multi-layer tube shoulder, wherein said mold defines a first cavity and a second cavity, and said multi-layer tube shoulder is formed by the steps of: 
 injecting a first material component into a first cavity ( 22 );    using a support ( 12 ) to remove said first material component from said first cavity in a partially plastic state;    inserting said partially plastic first material component into a second cavity ( 23 ), said second cavity having, after receipt of said first material component, a free space extending such that at least one face ( 4 , 5 ) of said first material component is exposed;    injecting a second material component into said second cavity and onto said first material component, said at least one face being engaged by said second material component and serving as a mechanical stop for the first material component with respect to the second material component, so that there is a positive connection between the first and second material;    wherein said mold comprises a base body ( 11 ) and a core ( 12 . 1 ,  12 . 2 ), wherein at least one of the base body ( 11 ) and the core ( 12 . 1 ,  12 . 2 ) are closed with a media selected from the group consisting of gaseous and liquid media.    
     
     
         2 . A tube shoulder, said tube shoulder being made according to the following steps: 
 said multi-layer tube shoulder is formed by the steps of: 
 injecting a first material component into a first cavity ( 22 );  
 using a support ( 12 ) to remove said first material component from said first cavity in a partially plastic state;  
 inserting said partially plastic first material component into a second cavity ( 23 ), said second cavity having, after receipt of said first material component, a free space extending such that at least one face ( 4 , 5 ) of said first material component is exposed;  
   injecting a second material component into said second cavity and onto said first material component, said at least one face being engaged by said second material component and serving as a mechanical stop for the first material component with respect to the second material component, so that there is a positive connection between the first and second material;    and wherein said at least one face ( 4 ,  5 ) of a barrier layer ( 3 ) serves as a mechanical stop for an outer layer ( 2 ) and thereby provides a positive connection between the barrier layer ( 3 ) and the outer layer ( 2 ).    
     
     
         3 . The tube shoulder according to  claim 2 , wherein said at least one face ( 4 ,  5 ) is annular.  
     
     
         4 . The tube shoulder according to  claim 4 , wherein an outlet port ( 6 ) has a non-circular cross-section so as to impress a pattern on the filled material passing through said outlet port, said pattern corresponding to the non-circular cross-section of said outlet port.  
     
     
         5 . The tube shoulder according to  claim 4 , wherein the barrier layer ( 3 ) is a first color and the outer layer is a second color, said first color being different than said second color.