The method and the unit for protection of bare ends of multilayer laminated foil with at least one metal layer are applied to the production of packages of laminated foil, especially tubes, bottles, boxes, and more. PRIOR ART

There is a traditional method and unit [US3388017] for protection of bare ends of multilayer laminated foil with at least one metal layer.

With the traditional method for protection of bare ends of multilayer laminate foil with at least one metal layer, a powerful laser beam is directed against the selected middle layer whose bare end should not interact with the products to be packed in this foil, the laser vaporizes the layer to a specified depth. The partially evaporated layer can be made of paper, aluminum and other material. The resulting channel is filled with additional safety material or by bending and compression of the adjacent outer layers.

The known unit for protection of bare ends of multilayer laminate foil with at least one metal layer comprises of a laser evaporator, a sealing nozzle and/or sealing clamps.

Disadvantages of the known unit for protection of bare ends of multilayer laminate foil with at least one metal layer are that:

· The use of a laser complicates the unit and requires additional fire protection;

• during evaporation the processed layer and its adjacent layers are partially burned and the resulting volatile toxic wastes remain in the work area; • using elements of foil contaminated with this toxic waste may contact the product being packed into it, which is unacceptable;

• for the same reasons additional protective clothing and masks for the staff are required;

· the traditional method for protection of bare ends of multilayer laminate foil with at least one metal layer can handle only linear parts, which limits the application of the resulting parts.

OBJECT AND SUMMARY OF THE INVENTION

The object of the invention is to create a simplified method for protection of bare ends of multilayer laminate foil with at least one metal layer, with extended use, safe for staff, with high quality protection for the manufactured end and the ability to handle ends with different topologies.

This object is achieved by creating a method for protection of bare ends of the multilayer laminate foil with at least one metal layer, where the blank of multilayer laminated foil with at least one metal layer is placed on a work surface. Then pressure and heat are simultaneously applied to the blank until the non-metal layers of the blank are molten and, as a result of the applied pressure, partially slip until the end of the metal layer is covered by the molten layers and the molten layers merge. Then the heating stops and the molten area is cooled under pressure, until the merged layers harden. Then the pressure is terminated and the blank is removed from the work surface.

It is possible that in the method for protection of bare ends of multilayer laminate foil with at least one metal layer, the heating can be carried out by a high frequency electromagnetic field.

It is possible that in the method for protection of bare ends of multilayer laminate foil with at least one metal layer, the flow of molten material to be restrained by an additional molding element.

A unit for protection of bare ends of multilayer laminate foil with at least one metal layer is created, which has a work surface for placing a blank of laminated foil with at least one metal layer that has to be protected. Furthermore, the unit has a clamping element with an embedded heating element located above the work surface.

It is possible that in the unit for protection of bare ends of multilayer laminate foil with at least one metal layer the heating element has a built-in induction coil.

It is possible that in the unit for protection of bare ends of the multilayer laminate foil with at least one metal layer there is a molding element.

Advantages of the unit are that it can work with different topologies of the protected ends, no burning occurs and thus no release of hazardous compounds into the area of the protected ends and the unit does not use dangerous appliances such as lasers. DESCRIPTION OF THE FIGURES

In detail the invention is explained by an example implementation of the unit shown on the attached figures, in which:

- Figure 1 is a longitudinal section of the unit in the starting position and the beginning of the heating;

- Figure 2 is a longitudinal section of the unit in the position of compression and molding;

- Figure 3 is a longitudinal section of the unit in the final position;

- Figure 4 is a longitudinal section of the unit in the position of compression and molding in case an additional molding element is used.

EXAMPLE IMPLEMENTATION AND OPERATION OF THE INVENTION

In more detail the invention is explained with an example implementation of the unit for protection of bare ends of multilayer laminate foil with at least one metal layer, shown in the figures.

Method for protection of bare ends of multilayer laminate foil with at least one metal layer 3, where the blank 2 of multilayer laminate foil has at least one metal layer 3, this blank 2 is placed on the work surface 1. Then on the blank 2 simultaneously are applied compression and heating with compressing element 4, while non-metal layers 5 of the blank 2 melt and due to applied pressure slip over the end of the blank 2 and the end of the metal layer 3 is covered by molten non-metal layers 5 and non-metal layers 5 merge into one another. Then the heating is terminated and the blank 2 is cooled under pressure, until the merged non-metal layers 5 harden. Then the pressure is terminated and the blank 2 is removed from the work surface 1. Molten material may be restricted by a molding element 7.

It is possible the compressing element 4 to has an embedded induction coil 6, to which a high frequency current can be supplied (the current source is not shown in the figures) and the induced electromagnetic field will heat the metal layer 3 of the blank 2 and thus to melt the non-metal layers 5.

In both cases, the non-metal layers 5 of the blank 2 melt and as a consequence of the applied pressure partially slip. The metal layer 3 does not melt and does not significantly change its position. Thus, the cut of the metal layer 3 remains covered by the molten material of the non-metal layers 5. Follows termination of the heating and cooling under pressure, during which the molten non-metal layers 5 harden.

The resulting blank 2 from multilayer laminated foil with at least one metal layer 3 is removed from the unit, or can remain in place and move to the next position for subsequent operations (not shown in the figures) such as, for example, molding.