Device for gluing rolls of web material and associated method

A device for gluing a tail edge of a roll of wound web material, comprising:

• a feed path for said roll;
• along said path a station for unwinding and positioning the tail edge of the roll;
• in said unwinding and positioning station, a first movable member and a second movable member making contact with said roll so as to unwind and position the tail edge thereof;
• a glue dispenser comprising a glue reservoir and a dispensing element which is movable along a dispensing path and which is immersed in glue and, moving upwards, dispenses glue for gluing of the tail edge;
• and support section bar on which the tail edge of the roll is rested, said dispensing path intercepting said section bar so as to apply the glue onto a surface of the tail edge which, by means of subsequent winding-up, comes into contact with a roll surface.

A method for gluing a tail edge of a roll of wound web material, comprising steps of:

• providing a feed path for said roll and feeding said roll along said path;
• providing along said feed path a station for unwinding and positioning the tail edge of said roll of web material;
• providing, in said unwinding and positioning station, at least one first movable member and one second movable member;
• said feed path passing through a nip between said first movable member and said second movable member;
• arranging said roll of web material in said unwinding and positioning station, in contact with said first movable member and with said second movable member;
• unwinding and positioning the tail edge of said web material by means of movement of said first movable member and said second movable member;
• while said roll is in said unwinding and positioning station, applying glue onto a surface of the unwound tail edge which subsequently comes into contact with the roll by means of a dispensing element which removes said glue from a glue reservoir and transfers the glue onto the web material of said roll;
• the tail edge being subsequently wound onto the roll and caused to adhere to the roll;
• feeding the roll, onto which the glue has been applied, along said feed path between said first movable member and said second movable member so as to move said roll across said nip away from the unwinding and positioning station.

A method for gluing a tail edge of a roll of wound web material, comprising steps of:

• providing a feed path for said roll and feeding said roll along said path;
• providing a station for unwinding and positioning the tail edge of said roll of web material;
• providing, in said unwinding and positioning station, at least one first movable member and one second movable member;
• said feed path passing through a nip between said first movable member and said second movable member;
• arranging said roll of web material in said unwinding and positioning station, in contact with said first movable member and said second movable member;
• unwinding and positioning the tail edge of said web material by means of movement of said first movable member and said second movable member;
• applying glue onto the web material by means of a dispensing element which removes said glue from a glue reservoir and transfers the glue into a predetermined zone of a roll surface;
• while the roll is in contact with said first movable member and said second movable member;
• feeding the roll, onto which the glue has been applied, along said feed path between said first movable member and said second movable member so as to move said roll away from the unwinding and positioning station across said nip;
• the tail edge being wound on the roll thus causing said tail edge to adhere to the roll.