Resin film laminated metal sheet for can and method for fabricating the same

Abstract

The present invention relates to a resin film laminated metal sheet for can, in which both faces of the metal sheet have resin film laminated layers, and a surface free energy γ s of a face of the resin film is 10 dyn/cm or more to less than 30 dyn/cm, the face becoming an inside of can after can-making and being contacted with stuffed food contents. As the resin film, applicable is a polypropylene film or a propylene ethylene based random copolymer film of polypropylene being a main component. Further, a resin film of polyester being a main component and containing a wax component of 0.1 to 2.0 % is used in a resin film to be an inside of can after can-making. The resin film laminated metal sheet for can according to the invention has excellent formability and adhesion while can-making and superior taking-out property of stuffed food contents.

1 . A film laminated metal sheet for a container, comprising: 
 a metal sheet;    a resin film A laminated on a surface A of the metal sheet, the surface A being an outer surface side of the container after formation of the container;    a resin film B laminated on a surface B of the metal sheet, the surface B being an inner surface side of the container after formation of the container;    the resin film A being a thermoplastic resin film containing polyester as a main component; and    the resin film B being a thermoplastic resin film containing polyester as a main component and containing a wax component in an amount of 0.10% to 2.0% by mass with respect to the resin of the resin film B.    
   
   
       2 . The film, laminated metal sheet according to  claim 1 , wherein the wax component of the resin film B is carnauba wax or ester stearate.  
   
   
       3 . The film laminated metal sheet according to  claim 1 , wherein the resin film A and/or the resin film B is a biaxially oriented polyester film having a relaxation time T1ρof a benzene ring carbon at a 1,4 coordinate in a structure analysis according to a high solid resolution NMR is 150 msec or longer.  
   
   
       4 . The film laminated metal sheet according to  claim 1 , wherein 90 mol % or more of polyester units constituting the resin film A and/or resin film B are ethylene terephthalate units.  
   
   
       5 . The film laminated metal sheet according to  claim 1 , wherein the resin film A and/or the resin film B are constituted of at least two layers, and the difference between intrinsic viscosities of a laminate layer contacting the metal sheet and a layer other than the laminate layer is in a range of 0.01 to 0.5.  
   
   
       6 . The film laminated metal sheet according to  claim 1 , wherein the resin film B is constituted of at least two layers, and the resin film B is formed such that only an uppermost layer to be in contact with the content substance contains 0.10 to 2.0% in a ratio by mass of the wax component with respect to the resin.