A bag made of a flexible packing material

The present invention relates to film-forming compositions coated bag of flexible Packaging material with a rupture zone.

It is known foods in bags as tubular bag, fill the bag and to close by sealing. The removal of the bag contents, for example, carried out by tearing of the tubular bag. Depending on the type of packaging material the tearing operation difficult. In particular, flexible packaging materials of extensible or resistant plastics can only be bad break open and the contents remove. Therefore Anreisshilfe is often stamped on a seal. In order to succeeds at best to open the bag, the contents of which can, however, often not see clean or it must further torn about Anreisshilfe, the bag are what is very often designed troublesome for the consumer. It is already been proposed, for example, tubular bag with a tear strip to provided. This tear strip can be pulled off over the circumference of the bag, which divides the packaging material and thus the bag is opened. However, this is a very complicated process, as the tear strip in the Schichtaubau must be installed packaging material.

From US-patent specification 5,316,209 is known a printed packaging film for packaging use of angular materials. The packaging film is a overlapping seam around the object struck and printing controls the liability the overlapping seam of the packaging film. By tearing aid in the form a cut in the overlapping seam and by the controlled adhesion to a light Opening the package can be achieved.

The US Patent 1,578, 066 describes a package for butter, in which the product to be packaged Good enveloped by a provided with perforations as predetermined breaking points cardboard is. To the carton an unperforated wax paper is beaten.

Object of the present invention is to provide a bag available, the one at any Point and advantageously in a border region that contains attachable and tearing aid the bag can be easily opened, whereby the contents of the bag is released in such a way is that the contents can be taken out without opening further manipulations.

According to the invention this is achieved in that the tear zone is a weakened in Form a dissection, perforation or notch in the packaging material is and covered the area of ​​the weakening at least one film-forming composition is and after the packaging process, a content is protected by the bag and Removal of the contents of the bag, a drawing or bending movement the over-coated film-forming Mass breaks up and releases the contents of the severing of the bag or overcoated film-forming mass breaks and tears open the perforation or notch and the bag releases the content.

As bag according to the present invention are, for example, flat bags, sachets, understand travel bag or plastic bags. Preferred sachets and Tubular bag. As a flexible packaging material, including packaging materials, packaging materials, packaging films, etc. mentioned, can be used in essentially all known flexible packaging materials will. The packaging materials are to be machinable, ie for use be suitable for packaging machines. The packaging materials include those Optionally laminated paper with barrier layers and / or with plastics or Cellophane or packaging materials containing aluminum foils, as with sealing layers and occasionally other plastic layers provided aluminum foils or packaging materials of plastic foils or plastic films, one or both sides with Paper or metal foils are coated or packaging materials from plastics, a barrier layer such as a plastic barrier layer ceramic barrier layer or a metallic barrier layer.

As plastics, for example, polyolefins such as polyethylene or polypropylene, Polyamides, polyvinyl chloride or polyester, etc., available in single film or as a composite film or using various plastics in the composite as a multilayer Film composites are used. can barrier layers between at least two layers such as Ethylvinylalkoholsperrschichten, or ceramic, respectively. glassy or be arranged metallic barrier layers. The plastic films or film composites may have a thickness of for example 10 to 100 .mu.m, preferably 30 to 50 .mu.m.

The packaging material can have one or both sides, preferably on the prepared when it Bag inwardly facing side with a sealing layer such as a his seal lacquer or a sealing film of eg polyolefins such as polyethylene coated. For example for impermeable heat-sealed bag is a sealing layer containing 6 to 7 g / m² Sealing wax sufficient.

The packaging material is advantageously applied as a continuous or rolls.

On packaging material is in the range of provided for the bag tear zone a Weakening attached. The weakening of the packaging material can be mechanically, for example, by cutting blades, chemically, for example by solvent, thermally, for example, by laser beams in the form of severance, perforation, notching etc. be made. Preferably, the severing is. The weakening can straight or be bent and the weakening may be configured such that they attach themselves Bag which is made of the flexible packaging material around the entire circumference or parts of the circumference of each bag covers.

The area of ​​weakness on the inventive bag is film-forming with a Ground covers. By region of the weakening not only the weakening itself Segregate also the adjacent parts of the packaging material, for example, the range between 2 and 20 mm, preferably 5 and 10 mm, adjacent to the weakening understood.

The inventive bag can only in the region of the weakening of the film-forming be coated mass, such a bag but advantageously is complete with the film-forming Ground coated. The film-forming composition is in particular the printing of Bag represents.

Advantageously embodiment, the film-forming composition is in the region of the weakening dikker than in the remaining region of the bag. In the film-forming composition may be a Layer, or a plurality, for example two, three, four, five, six, etc. layers, act of film-forming compositions. covers the film-forming composition and closes the vorgänig Inappropriate weakening and gives the packaging material in the area of Weakening again a tensile strength.

The film-forming composition, or in the use of several superimposed Layers of film-forming compositions of the total amount, may be advantageous in the field of Weakening in amounts of 2 to 8 g / m², Advantageously from 3 to 6 g / m² and advantageously 3.5 to 5 g / m² be applied. Outside the range of Schwächun gen, the film-forming Mass for example in quantities of 1 to 7 g / m², Advantageously from 1 to 5 g / m² and advantageously 1 to 4 g / m² be applied.

To produce a film-forming composition, for example, paint colors can of volatile Ingredients such as solvents, and non-volatile ingredients such as film formers, resins, Plasticizers, excipients, dyes, pigments, fillers etc. are used. Preference is given to printing inks as film-forming compositions containing dyes or pigments, Solvents, fillers, other additives and binder. are advantageous as binders Resins, varnishes, nitrocellulose, polyamides, vinyl resins, rosin resins, maleate resins, Shellac, etc. The paint colors provide particular printing inks and is able by means of a Printing press as printing on the pre-weakened flexible packaging material be printed. The printing is not only the film-forming composition, but same time the decorative, and occasionally also informative, printing for the bags. The printing on the packaging material outside on to a bag by or are on the inwardly facing side or on both sides, attached.

The film-forming composition also substances in a plastic form can be transferred as softened or melted and outside on the packaging material, on to a bag by or on the inwardly facing side or both sides, be applied as a film.

The film-forming composition can be applied by extrusion coating. to Extrusion coating suitable Example, polyolefins such as polyethylene or polypropylene, or polyvinyl chloride-containing materials.

With film-forming compositions are also coatings by means of hot melt compositions, and hot melt coating compositions called includes. These are, for example, at normal temperature solid, viscoelastic or viscoplastic materials, preferably based on Resins, waxes, thermoplastics and elastomers, possibly with the addition of fillers, antioxidants, Lubricants and the like., When heated after passing through a thermoplastic pass area in viscous or low-viscosity melt.

The film formation on the packaging material by means of the film-forming compositions may also done by chemically drying paints. The chemically dried paint include cross-linked macromolecules by chemical reaction and thereby in particular obtained by polymerisation.

The film-forming compositions may also films, especially low tensile strength or high Brittleness be. The thicknesses of the films may be, for example 5 to 20 microns. Preferred films could polyolefins, such as polyethylenes or polypropylenes, polyesters or polyamides contain. The films may be on the packaging material, the outside on to a bag by or on the inwardly facing side or both sides, are mounted, the adhesion of the film or films to the packaging material by laminating adhesive and / or adhesion promoters, optionally with the additional application of corona, flame, Plasma or ozone treatment, can take place. For example, the film, in particular have when applied to the bag at the inwardly facing side, heat-sealing properties. The film is then simultaneously a sealing layer. The film may also, as a arranged further film-forming composition to the printing ink on the packaging material be.

If on the outwardly and the inwardly facing side of the packaging material film-forming compositions are mounted, they may be identical or different.

The materials of the film-forming compositions are expediently physiologically harmless and approved for food packaging.

Further examples of arrangements of film-forming compositions on the packaging material sealing lacquers are, for example, from polyolefins such as polyethylenes, which is mounted on the ink will. The film-forming composition is preferably on the bag outwardly Page. The film-forming composition may also directed on the bag inside be side mounted. It may involve, for example to ink a counter pressure. In the ink of the counter-pressure, a further film-forming composition in the form be arranged a sealing lacquer. The packaging material may also on the bag outwardly directed side a layer of a film-forming composition, eg, a printing ink, and on the bag on the inboard side includes a sealing lacquer.

The present invention also relates to a method for producing a bag according to the present Invention. The process may advantageously be carried out such that at the flexible Packaging material is weakened and then mounted the weakening is covered by at least one film-forming composition.

The film-forming compositions can be exemplified the above coatings, printing inks, extrusion coatings, Hot melt compositions and so on are applied. Usually acts it. to liquid resp molten coating systems. The application of the film-forming compositions For example, by centrifugation, spin, flooding, casting, rolling, spraying, Brushing, printing, extruding, etc. made. In general, these at the flexible packaging materials to continuous material, which is why coating process as extruding, spraying, rolling, printing or molding particularly to offer.

In a particularly preferred method the flexible packaging material is in a provided printing with the weakening and then the printing with Overprint varnishes made as film-forming composition. In this method, the flexible Packaging material in a printing press, for example, in a letterpress, gravure, Post-print and out especially flexo-printing machine. Examples of printing machines are intent printing, multi-cylinder, single-cylinder, in-line, flexo and Vario presses or combinations thereof, such as flexographic and gravure printing presses. Suitably in the range of the printing cylinder, before the start of printing, or in multi-cylinder Equipment in the area of ​​the first printing cylinder is weakening by advantageous a cutting plant on the flexible packaging material attached. Subsequently, the flexible Packaging material provided with the correct pressure, wherein the weakening is overprinted and the overprint varnish seals the weakening. The pressure paint application is for example performed in such a way that in the area of ​​weakening, the overall thickness of the printing varnish is greater than in the remaining area of ​​the flexible packaging material. By means of the register control can the printing operations are carried out dimensionally accurate and, together with a clean print image can in particular the weakening and the area around the weakening be taken exactly by the overprint varnish.

This bag of flexible packaging material can for packaging food be used in powder to solid consistency. A preferred use is in the packaging of bars of chocolate, starchy foods, fatty foods, or food preparation in the form of mixtures of Chocolate with starch and / or fatty foods, all food preparation advantageously in the form of bars.

The packaging of chocolate bars and the like is. Preferable because the tearing in this case, the chocolate bars as abutment for buckling breaking the bag serves.

If the bags are made from tube material, the bags each terminal a cross-sealing seam on, or if the bags are produced from sheet material, , the bag on a longitudinal seam sealing and terminal per a cross-seam sealing. The Sealing the seams can be carried out by cold sealing, heat sealing or by gluing.

In the packaging of, for example, chocolate bars is the weakening advantageously in one of the two end regions of the bag, ie about 10-30 mm from the end of the bag, which is terminated with a transverse sealing seam. Particularly preferred tubular bags are with a longitudinal seam sealing and terminal transverse seam seals. If the bag along the torn weakness, then sets the plan proceeds of up to the full extent bag around, however, the longitudinal seam sealing prevents further tearing. At the Longitudinal seam and the longitudinal seam sealing is the bent end of the bag hanging. The content of the bag can now be easily pushed out or out of the box be consumed with the articulated bag piece on the longitudinal seam with the rest of bag remains connected and not to be disposed of separately or falling to the ground pieces bag forms.

Figures 1-6 exemplify present invention.

1 shows schematically the production of a tubular bag.

Figure 2 shows a schematic view of a tubular bag.

Figures 3, 4 and 5 show a further hose bag from the front and back, and the wide-open state.

Figure 6 shows a section through the packaging material in the area of ​​weakening.

According to Figure 1, the packaging material 10, which is already with the weakening and example overprinted on the weaknesses in the form of a multi-color print is provided, unwound from a supply roll and fed to the packaging operation. The arrow 11 indicates the Füllguteinschub and the Füllguteinschub is continuously the longitudinal seam sealing 12 and the cross-seam sealing 13 made, in each case a packing unit 14 is produced. A cutter 15 divides the material into bags 16 with the transverse seams the longitudinal seam 17 and 19th

In Figure 2, the tubular bag 16 is ready. The longitudinal seam 19 is located on the back side and both ends of the tubular bag 16 is closed by transverse seams 17th by broken is the attenuation indicated 18, which in the region of one end of the tubular bag 16 is and is covered with, for example, an overprint varnish.

Figures 3 and 4 show a further hose bag 16 with the transverse seams 17 on both Ends and the longitudinal seam 19 is the weakening 18, which is under the 4 shows by printing ink is pressure pattern produced, dash-dot lines. Will the Pack, for example by gripping the pack at the transverse seams 17 and by pulling claimed to train, so the package is separated along the weakening 18 and by pulling and twisting, for example, simultaneous pulls the sheet material further, usually along a tear line 20, which is dot lines in FIG. 3 The tear line 20 terminates at the longitudinal seam 19, as there respectively a material accumulation. material thickening created by the refolding and sealing. Thus, the tubular bag 16, 19 is open along its circumference except for the area of ​​the longitudinal seam and the contents can be easily removed, for example by removing poking from the end. The two Parts of the tubular pouch 16 holding the longitudinal seam 19 together and can then be disposed of.

5 shows the tubular pouch 16 with the transverse seams 17 and the longitudinal seam 19 in torn Form. The bag part 27 is bent over the packaging material of the longitudinal seam 19 connected to the rest of the tubular bag sixteenth The tearing carried along Weakening 18 and continued over the tear line 20 to the longitudinal seam 19. The content 26, for example, a chocolate bar, the tubular bag 16 can now easily be removed or directly be consumed from the pack out.

6 shows a section through the packaging material 10 in the region of the weakening 18. The weakening 18 is for example made of a plastic film 21 and the weakening 18 represents a cut through the plastic film. On the Plastic film 21 is provided on the bag on the outwardly facing side of a multilayer in which Usually multicolored, printed with the printing lacquers 23, 24 and 25 attached. In the design of of the printed image was in the region of weakening 18, an additional layer of a Printing lacquer 24 is applied, whereby the total thickness of the overprint varnish layer opposite the rest of the packaging material increases 10 and the weakening safely covered, closed and the packaging material 10 has a tensile strength is given again. occasionally, , the packaging material 10 on the bag at the inwardly facing side of the Sealing layer 22, in particular a sealing wax, be appropriate. The seal coating 22 serves primarily but for subsequent sealing of the seams, can the print varnish 23, 24, 25 in its support action.