Closure for plastic packaging containers

Abstract

The present invention relates to a closure for plastic packaging containers that exhibits innovative features that can simplify the manufacturing process and the filling with liquid and viscous products, but the main effect of which is to prevent the package walls from collapsing following a change in vapour pressure inside the container, regardless of the filling temperature.

1 . A lid for a plastic pack comprising a sheet with a plurality of ridges and grooves in a corrugated format that surround at least part of the surface of the sheet. 
     
     
         2 . The lid for a plastic pack according to  claim 1 , wherein the ridges and grooves in the corrugated format are endowed with curved ends. 
     
     
         3 . The lid for a plastic pack according to  claim 1 , wherein the number and height of the ridges and grooves varies, depending on type of product and its fabrication and filling processes, being larger when stronger vacuums are formed due to the product filling temperature as well as product oxidation reactions during the useful life thereof. 
     
     
         4 . The lid for a plastic pack according to  claim 1 , wherein the sheet comprises a layer of aluminum covered by a layer of polyethylene, polypropylene or thermo-sealing varnish. 
     
     
         5 . Plastic packaging comprising the lid according to  claim 1 . 
     
     
         6 . The lid for a plastic pack according to  claim 2 , wherein the sheet comprises a layer of aluminum covered by a layer of polyethylene, polypropylene or thermo-sealing varnish. 
     
     
         7 . The lid for a plastic pack according to  claim 3 , wherein the sheet comprises a layer of aluminum covered by a layer of polyethylene, polypropylene or thermo-sealing varnish. 
     
     
         8 . Plastic packaging comprising the lid according to  claim 2 . 
     
     
         9 . Plastic packaging comprising the lid according to  claim 3 .