Method and plant for applying a heat-shrinkable lable to containers
A container labelling method consisting of predisposing means for supporting at least one container in an erect position; from below, mounting onto the body of said at least one container a heat-shrinkable label in the form of an annular band; and causing the label to adhere to said container. The method is implemented by a plant comprising a device for supporting and transporting at least one container which acts from above on the container suspended in an erect position; means for mounting a heat-shrinkable annular band onto the container from below; and means for causing said label to adhere to said container by heat-shrinkage.
1. A labelling plant for containers having a rim or collar, comprising:
a support device for directly supporting at least two containers held by means that attach to the collar on each of said containers, and for transporting at least one of the containers which is suspended in an erect position;
means for slidably moving said at least two containers along said support device;
means for mounting at the same time a heat-shrinkable annular band onto each of said at least two containers acting from below the containers;
means for causing said annular bands to adhere to said containers by heat-shrinkage;
wherein said means for mounting a heat-shrinkable annular band onto each of said containers comprise at least one vertically movable support plate to transport the annular bands which are disposed vertically; and
the means for causing each of the annular bands to adhere by heat shrinkage is supported on said support plate.
2. A plant as claimed in claim 1 , wherein said means for causing the heat-shrinkable annular band bands to adhere by heat-shrinkage comprises a system for delivering a hot fluid.
3. A plant as claimed in claim 2 , wherein said hot fluid is steam.
4. A plant as claimed in claim 1 , wherein said means for causing the heat-shrinkable annular band bands to adhere to the container/containers comprise a plurality of hot fluid dispensing nozzles supported on the vertically movable support plate.
5. A plant as claimed in claim 1 , wherein said vertically movable support plate comprises a unit for maintaining the heat-shrinkable annular band vertical.
6. A plant as claimed in claim 5 , wherein said unit for maintaining the heat-shrinkable annular band vertical comprises vertical rods branching from a fixed plate connected to the vertically movable support plate by virtue of at least one cylinder-piston unit.
7. A plant as claimed in claim 6 , wherein said vertical rods are disposed on the perimeter of an imaginary circumference to maintain the heat-shrinkable annular band widened while it is mounted onto the container.
8. A plant as claimed in claim 6 wherein said vertical rods are inserted through corresponding matching holes present in the vertically movable support plate and pass beyond said plate to externally receive the heat-shrinkable annular band.
9. A plant as claimed in claim 1 , wherein said at least one vertically movable support plate is configured to vertically transport said heat-shrinkable annular band onto said at least one container.