Method for manufacturing a head assembly comprising a tube head and a barrier insert

A method for manufacturing a head assembly comprising a tube head and a metal barrier insert, comprising:

• providing a sheet of multi-layered material comprising
• an intermediate metal layer defining an upper surface and a lower surface,
• an upper layer made of plastic material covering said upper surface of the intermediate metal layer,
• a lower layer made of plastic material covering said lower surface of the intermediate metal layer, and
• at least one opening defining an inner edge,
• heating at least one of said upper and lower layers, so that said upper or lower layer melts and the plastic material flows and covers the inner edge of the intermediate metal layer,
• processing said sheet of multi-layered material in order to form an outer edge, thereby defining a barrier insert,
• heating at least one of said upper and lower layers, so that said upper or lower layer melts and the plastic material flows and covers the outer edge of the intermediate metal layer, and
• attaching said barrier insert to an inner side of a shoulder of a plastic tube head, the shoulder adapted to be linked to a tube skirt, the barrier insert being entirely covered by the inner side of the shoulder.

A method for manufacturing a head assembly comprising a tube head and a metal barrier insert, the method comprising:

• providing a barrier insert comprising:
• an intermediate metal layer being a disc having an inner opening, defining an upper surface, a lower surface, an inner edge and an outer edge,
• an upper layer made of plastic material covering said upper surface of the intermediate metal layer, and
• a lower layer made of plastic material covering said lower surface of the intermediate metal layer,
• heating at least one of said upper and lower layers, so that said upper or lower layer melts and the plastic material flows and covers at least the inner edge or the outer edge of the intermediate metal layer, and
• attaching said barrier insert to an inner side of a shoulder of a plastic tube head, the shoulder adapted to be linked to a tube skirt, the barrier insert having a protective film associated therewith and covering the edges of the barrier insert, wherein said protective film is a multi-layered film comprising outer layers of polyethylene and an inner layer of ethylene vinyl alcohol.

A method for manufacturing a head assembly comprising a tube head and a metal barrier insert, the method comprising:

• providing a barrier insert comprising:
• an intermediate metal layer being a disc having an inner opening, defining an upper surface, a lower surface, an inner edge and an outer edge,
• an upper layer made of plastic material covering said upper surface of the intermediate metal layer, and
• a lower layer made of plastic material covering said lower surface of the intermediate metal layer,
• heating at least one of said upper and lower layers, so that said upper or lower layer melts and the plastic material flows and covers at least the inner edge or the outer edge of the intermediate metal layer, and
• attaching said barrier insert to an inner side of a shoulder of a plastic tube head, the shoulder adapted to be linked to a tube skirt, the attaching further comprising applying a layer of protective varnish on the edges of the barrier insert after the heating step and prior to any assembly.