Sealing system for containers

Abstract

A sealing system is for containers, in particular of the type that envisages sealing with an aluminum cap. Forming equipment of a cap or seal of weldable sealing material is for the application on the mouth of a container. The equipment includes at least one forming device ( 52 ) of the seal or cap, the at least one forming device ( 52 ) is arranged along the periphery of a forming roll ( 31 ) tangent to and moved in sync with a positioning roll carrying at least one disc or sheet of the sealing material for forming the seal or cap.

1 . A forming equipment of a cap or seal of weldable sealing material for the application on the a mouth of a container, said equipment comprising at least one forming device of said seal or cap; wherein said at least one forming device is arranged along a periphery of a forming roll tangent to and moved in sync with a positioning roll carrying at least one disc or sheet of said sealing material for forming said seal or cap. 
     
     
         2 . The equipment according to  claim 1 , wherein the positioning roll is connected to a vacuum adapted to retain the disc or sheet of sealing material on an outer surface of the positioning roll. 
     
     
         3 . The equipment according to  claim 1 , wherein the positioning roll comprises along an outer surface thereof a plurality of mould elements of said seal or cap, each mould element comprising a mould profile which reproduces in negative a shape of the seal or cap, and wherein the mould profile comprises a central hole in which a duct is fitted which leads into a central portion of the positioning roll, and the central portion is connected to a vacuum, and wherein around an outer hole of the duct, a ring of ferromagnetic material is positioned. 
     
     
         4 . The equipment according to  claim 1 , wherein the forming roll comprises a plurality of forming devices along the periphery of the forming roll, each forming device being mounted in a swinging manner to a first end of a rod, wherein the rod is fitted in a seat formed inside the forming roll, so that said first end protrudes outwards while a second end opposite the first end is facing a cavity and pushes against a calibrated spring. 
     
     
         5 . The equipment according to  claim 4 , wherein the rod has a recessed portion with a lower shoulder and an upper shoulder, the lower shoulder and the upper shoulder forming a stroke limiter of the rod by interaction with a corresponding internally protruding section of the seat, said internally protruding section having an extension in length smaller than an extension of said recessed portion. 
     
     
         6 . The equipment according to  claim 4 , wherein, at the first end of the rod, a pin is transversely fitted which supports in a swinging manner the forming device and wherein the forming device includes a body having a support end, facing outwards, and a coupling end with the rod, a punch being removably fixed to the support end of the body. 
     
     
         7 . The equipment according to  claim 6 , wherein the punch is made of non-ferromagnetic material and includes a hollow body which internally accommodates a magnet, the magnet being arranged in a central position and preferably having a cylindrical shape and an axis perpendicular to the bases of the cylinder aligned with a radius of the forming roll. 
     
     
         8 . The equipment according to  claim 6 , wherein the coupling end of the body of the forming device has a widened V shape with two ends and has, at the two ends of the V shape, two fixed pins, the body centrally having a slot arranged horizontally, in which the pin of the rod is fitted, and wherein a spring is arranged between each of the fixed pins, and the pin of the rod. 
     
     
         9 . The equipment according to  claim 4 , wherein the first end of the rod ends with a convex profile when viewed in the a direction perpendicular to a plane of the forming roll. 
     
     
         10 . A filling and sealing equipment of containers comprising the forming equipment according to  claim 1 .