SK18502000A3 - Method for producing a sealing plate - Google Patents

Abstract

Disclosed is a method for producing a sealing plate made that is made from a film-like substance and used to seal containers. According to the invention, at least one surface of the sealing plate (1) is provided with protuberances (5) made out of a UV light-curing material.

Description

Technical field

The present invention relates to a process for producing a sinker from a material foil for sealing containers.

BACKGROUND OF THE INVENTION

Are the crucibles, elements, of aluminum, known packaging, such as yoghurt with one-sided imprinted closure. closing sinkers, for example, which are provided with a thermal varnish for closing the yoghurt crucible on the future inner side.

In the production of one surface available in the thermal varnish layer of these sides in the form of sealing sinkers is on the aluminum foil, which is a roll, continuously applied surface printed aluminum and subsequently the opposite side is pre-printed and is the desired motif. The foil thus produced is subsequently the shape of the closure sinker by means of a cut-out process which is individually taken on a embossed pattern and is cut out. They form individual stacks, of which they are filled with crucibles using an exhaustor

By means of an embedded sinker, for example by welding with a thermal surface, it is ensured that the individual sinkers are reliably removed so that the formation of a lacquer is prevented.

only the bundles of two, three or more individual sinkers. .

However, the optical effect of the printing is adversely affected by the closure of the sinkers. In addition, there is stress on the material, which may be detrimental to the reliability of the product closure. The thickness of the individual sinkers increases as a result of the increased surface structure of the deposit, so that a stack with a specified number of sinkers requires more space compared to the unbonded foil material.

To avoid adversely affecting the optical effect of the printing on the lid, the European publication EP 79 81 08 A1 proposes a packaging lid which essentially consists of a stamped and unbroken foil. In this case, the foil is facing the wrapped goods and is provided with a thermal layer on the side of the wrapped goods, the unbroken foil being joined to the foil by means of an adhesive layer.

In this way, a print can be applied to the non-broken film on the side facing away from the goods without adversely affecting the production of such a lid, which is also expensive.

optical quality, but is expensive and

In order to overcome the above-mentioned disadvantages, closure sinkers are now known from a single, smooth, unbroken aluminum foil. In order to be easily detached, however, the sinkers are on the side facing the packaged goods and provided with a thermal varnish r r - 3

created by the method rotogravure spacers, too of thermal varnish. However, it has the disadvantage of having to production of platinum are two printing procedures required.

Because the thermal lacquer spacers can only be applied by gravure printing, while printing on the opposite side by printing from a height, preferably for example by flexographic printing. The production of spacers by flexographic printing with simultaneous inks does not yield any satisfactory spacing geometry.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is an object of the present invention to provide a process which makes it possible to produce easily manipulated sinkers and is both rational and thus cost-effective.

This object is achieved by a process for the production of a sinker from a material in the form of a container closure film, the principle being that at least one surface side of the sinker is formed by spacers of a UV curable material.

The spacers are preferably applied from above, for example by flexographic printing, wherein before applying the spacers, the surface of the closure sinker is provided with a thermal lacquer layer, the opposite surface is printed with the desired UV-curable color layer and spacers are applied.

The spacers are preferably applied to the foil material by a uniform grid system, where the spacers may be formed as circular islets.

The invention is based on a process for the production of a closure sinker for closing containers, in which a material foil, for example aluminum foil, plastic foil and the like, is used. The core of the idea of the invention is that spacers of UV curable material are deposited on at least one surface side of the sinker. The UV cured material has the advantage that there is no thinning due to the solvent, so that the thickness of the deposited layer substantially corresponds to the future dry film thickness. Thus, by applying a layer, the desired spacing height can be achieved without the need for (as in conventional colors) uneconomical or multiple application of the coarse layer.

In a preferred embodiment of the method, the spacers are printed from a height, for example by flexographic printing. In this way, both the printing and the spacers can be produced in one printing process, namely by flexographic printing. This is possible because, by UV radiation curable materials, elevations or spacers of suitable height can also be formed in the flexographic printing by a single application of the layer.

In order to achieve a particularly efficient and thus cost-effective embodiment of the method according to the invention, before the platinum side is applied, the printed thermal side is opposed to the lacquer, and the topcoated surface is applied to the tops.

In order to achieve a reliable separation of the individual sinkers, the ridges are applied to the material foil by a regular grid system. It is advantageous here that the ridges are designed as circular islets.

BRIEF DESCRIPTION OF THE DRAWINGS

Further details and advantages of the invention are set forth in the following description of an exemplary embodiment of the invention, which is shown in the drawing, where:

Fig. 1 shows a schematic partial cross-section of a sinker made by the process according to the invention, greatly enlarged, and

Fig. 2 is a top view of a closed sinker manufactured by the method according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 is a partially cross-sectional representation of a sinker made by the method of the invention. The locking sinker 7 consists

made of aluminum foil £, which is on one page provided layer 3 thermal varnish and on the opposite page shows different color

a layer 6 to cure the desired printing. Preferably, UV, curable, white, yellow, black, blue and dark blue colors are superimposed on each other to produce printing. Of course, any other color combinations are also possible.

At these UV radiation-curable ink layers 6, spacers are also applied from the UV-curable material in a further printing step, which is preferably flexographic printing. In a single printing step, the curable UV spacers 3 to colors would have to have a thickness so radiation µ.

use reaches the material

When, during the double thickness of the layers, so that the solvents achieved by such printing applications, the height h of the present coatings is applied after evaporation, the height h of the spacers.

In the course of time, the closure 1 of FIG. 1 by the following method steps:

a) full-area application of thermal lacquer layer 3 to aluminum foil material (instead of aluminum foil of any other material may be used in the same way),

b) application of UV-curable colored layers 6 to produce printing,

c) suppression of the color layers 6 by further UV radiation curable material to form spacers 5,

d) cutting out the sinker 1 in the desired shape.

In FIG. 2 shows the closure

The platinum of FIG. 1 v plan. closure platinum v in this form used to close yoghurt cup. On the opening the closed yoghurt crucible serving opening tongue 6th spacers 5 applied in a Grid on the print are because of transparency only partially.

The spacers 5 ensure that the closed sinkers are actually taken individually from the stack.

Claims (3)

PATENT CLAIMS Method for producing a sinker λ from a container closure film material, characterized in that at least one surface side of the sinker (1) is formed by spacers (5) from a UV curable material. Method according to claim 1, characterized in that the spacers (5) are applied from above, for example by flexographic printing. Method according to one of the preceding claims, characterized in that before the application of the spacers (5), the confirmation side of the closure sinker is provided with a thermal varnish layer (3), the opposite surface side is printed with the desired motif of UV-curable color layers (4). and that on the surface printed with the motif, spacers (5) are applied. Method according to one of the preceding claims, characterized in that the spacers (5) are applied to the film-like material by a uniform grid system. 5th process according to one of previous claims, v y z listen the because of spacers (5) are created than circular islets. 1/1