Assembly for closing a tube and tube comprising this assembly

Abstract

The invention relates to an assembly for closing a tube, said assembly comprising a tube head ( 3 ) that has a neck ( 10 ) and a closing cover ( 5 ) for closing said neck ( 10 ), the assembly further comprising a cap ( 30 ) which is provided with a piercing element ( 7 ) designed to perforate said closing cover ( 5 ), the neck ( 10 ) and cap ( 30 ) being configured such that the cap ( 30 ) is guided on the neck ( 10 ) into a closed position in which said piercing element ( 7 ) has perforated the closing cover, passing via an intermediate position in which the piercing element ( 7 ) has finished piercing said closing cover ( 5 ), and this also produces a material deformation which seals the closure, said assembly being configured such that the intermediate position is passed through prior to the material deformation which seals the closure.

1 . An assembly for closing a tube, said assembly comprising a tube head that has a neck and a lid closing said neck, said assembly further comprising a cap provided with a punch adapted to perforate said lid, said neck and said cap being configured to guide the cap over the neck to a closing position, in which said punch has perforated the lid, by passing through an intermediate position in which the punch has finished piercing said lid, as well as to cause a deformation of the material sealing the closure, said assembly being configured so that the passage through the intermediate position takes place prior to the deformation of the material sealing the closure. 
     
     
         2 . The assembly according to  claim 1  wherein the cap is screwed onto the neck during the passage through the intermediate position and up to the closing position. 
     
     
         3 . The assembly according to  claim 1  wherein said neck and said cap are configured to guide the cap from an initial position in which the cap is not engaged with the neck to a waiting position in which the punch is held away from the lid, and then from said waiting position to said closing position. 
     
     
         4 . The assembly according to  claim 3  wherein said cap and said neck are configured so that said intermediate position is located downstream of the waiting position along the direction of guiding the cap to the closing position. 
     
     
         5 . The assembly according  claim 3  comprising a thread portion and a threading for screwing the cap onto the neck, said assembly further comprising a stop configured to block the screwing of the cap in said waiting position, said assembly being configured so that said thread portion has passed said stop before the piercing of the lid begins. 
     
     
         6 . The assembly according to  claim 1  further comprising an non-return stop configured to prevent the cap from moving out of the closing position, said assembly being configured so that said stop is passed after passing into an intermediate position. 
     
     
         7 . The assembly according to  claim 1  wherein the punch comprises a plurality of teeth said intermediate position being the position occupied by the punch when all the teeth have pierced said lid. 
     
     
         8 . The assembly according to  claim 1  wherein said punch comprises a base having an outer cylindrical portion and said neck comprises an inner cylindrical portion, said inner and outer cylindrical portions being intended to be crushed against each other to achieve the sealing of said closure. 
     
     
         9 . The assembly according to  claim 8  wherein said cap comprises an top from which said base of the punch extends, said punch comprising an external chamfer extending said base and connected to a distal part of the punch. 
     
     
         10 . The assembly according to  claim 9  wherein said portion of the neck against which the base of the punch is intended to be crushed is located in the axial extension of a chamfer, located at an opening end of the neck. 
     
     
         11 . The assembly according to  claim 9  wherein said distal part of the punch has an outer diameter smaller than an inner diameter of the neck. 
     
     
         12 . A tube comprising a closure assembly comprising a tube head that has a neck and a lid closing said neck, said assembly further comprising a cap provided with a punch adapted to perforate said lid, said neck and said cap being configured to guide the cap over the neck to a closing position, in which said punch has perforated the lid, by passing through an intermediate position in which the punch has finished piercing said lid, as well as to cause a deformation of the material sealing the closure, said assembly being configured so that the passage through the intermediate position takes place prior to the deformation of the material sealing the closure.