Bottle neck structure and relative cap made of plastic material, particularly for water and beverages

Abstract

Bottle neck structure and relative cap made of plastic material, particularly for water and beverages, comprising a neck ( 1 ) screw ( 4 ) with concave arc-shaped helical element and volutes mutually adjacent to define narrow crests ( 5 ) and female screw ( 15 ) of the cap ( 2 ) with spiral of the arc-shaped convex thread accurately convexly complementary to the concavity ( 4 ) of the helical element of the neck.

1 ) Bottle neck structure and relative cap made of plastic material, particularly for water and beverages, characterised in that it comprises a neck ( 1 ) screw ( 4 ) with concave arc-shaped helical element and volutes mutually adjacent to define narrow crests ( 5 ) and female screw ( 15 ) of the cap ( 2 ) with spiral of the arc-shaped convex thread accurately convexly complementary to the concavity ( 4 ) of the helical element of the neck. 
     
     
         2 ) Bottle neck structure and relative cap according to claim one, characterised in that it comprises:
 an arc-shaped concavity ( 4 ) helically developing on the neck ( 1 ) to provide a screw ( 4 ) with arcature preferably not exceeding 120° (one hundred and twenty nonagesimal degrees);   a female screw ( 15 ) with the spiral of the arc-shaped convex thread accurately convexly complementary to the concavity ( 4 ) of the helical element of the neck ( 1 ).   
     
     
         3 ) Bottle neck structure and relative cap according to claim one, characterised in that the volutes of the arched helical concavity ( 4 ) or screw ( 4 ) on the neck ( 1 ) of the bottle ( 3 ) are mutually adjacent to define crests ( 5 ) as narrow as possible. 
     
     
         4 ) Bottle neck structure and relative cap according to claim two, characterised in that the arcature of the profile of the concavity ( 4 ) developing helically on the neck ( 1 ) to form a screw ( 4 ) and the arcature of the profile of the convex thread ( 15 ) developing as female screw ( 15 ) in the cap ( 2 ) are comprised between 90° (ninety nonagesimal degrees) and 120° (one hundred and twenty nonagesimal degrees). 
     
     
         5 ) Bottle neck structure and relative cap according to claim two, characterised in that the outer face ( 8 ) of the top annular edge ( 7 ) defining the opening ( 6 ) of the neck ( 1 ) of the bottle ( 3 ) is coplanar or preferably circumferentially sub-levelled with respect to the bottom of the helical arched concavity ( 4 ) or screw ( 4 ) provided on the neck ( 1 ) of the bottle ( 3 ). 
     
     
         6 ) Bottle neck structure and relative cap according to claim two, characterised in that the interior of the cap ( 2 ) near the top part ( 16 ) is divided by a pronounced interior annular partition element ( 18 ) with relief ( 19 ) on the relative outer face and by a smaller outer annular partition element ( 20 ) between which there is defined a circular interface ( 21 ) whose bottom ( 22 ) is shaped degrading from the outer annular partition element ( 20 ) towards the inner annular partition element ( 18 ). 
     
     
         7 ) Bottle neck structure and relative cap according to claim two, characterised in that an annular relief ( 9 ) with straight trapezoidal section with inclined side ( 10 ) free and facing upwards for abutment against a self-tear sealing strip ( 11 ) arranged underlying ( 12 ) at the lower part of the helical arched concavity ( 4 ) or neck ( 1 ) screw ( 4 ) is provided. 
     
     
         8 ) Bottle neck structure and relative cap according to the preceding claim, characterised in that said annular relief ( 9 ) is notched in low relief. 
     
     
         9 ) Bottle neck structure and relative cap according to claim two, characterised in that said neck ( 1 ) of said bottle ( 3 ) bears, at the lower part, a disc-shaped annular relief ( 13 ) for automatically handling the bottle ( 3 ) defined by adjacent lobes ( 14 ).