MXPA97003468A - Empaquet flexible material bag - Google Patents

Abstract

The present invention relates to a bag for retaining contents comprising at least one flexible packaging material having a surface with an exterior and an interior therein, and including an area for tearing the opening of the bag, wherein the area for tearing the opening of the bag is a weakening region in the packaging material, and the region exhibiting the weakening is covered above the surface to an area of at least 2 to 20 mm, close to the weakening region , with at least one film forming mass in the form of a coating printed on the packaging material, selected from the group consisting of (1) a multilayer multi-color coating and (2) a coating including printing ink , which provides the packaging material with stress reinforcement in the area of weakening, and where the contents of the bag are protected by the bag and, to extract the s contents of the bag, a traction or bending movement that breaks the packaging material and the film formation mass in the weakening region is made, with which the contents of the bag are accessible

Description

"FLEXIBLE PACKAGING MATERIAL BAG" The present invention relates to flexible packaging bags coated with masses that form a film, with a tear zone for its opening. It is already known to pack food products in bags, as tubular bags from continuous material, then closing the bag by sealing. The extraction of the contents of the bag can be carried out, for example, by tearing the tubular bag for its opening. However, packaging materials, especially flexible ones, made of stretchable or resilient synthetic materials can only be torn open with difficulty in extracting their contents. For this reason, an aid element for initial tearing in a sealing seam is often punched out. This is certainly achieved by opening the bag, but its contents often can not be removed cleanly or else you have to open more-the bag tearing it beyond the initial tear aid element, which is often laborious for the user. It has also already been proposed, for example, to provide an opening tear strip to the tubular bags. This tear strip can be torn along the entire contour of the bag, thereby dividing the packaging material and thus leaving the bag open. However, this is a very complicated procedure, since the tear-opening strip has to be incorporated into the layer structure of the packaging material. The object of the present invention is to provide a bag containing an initial tear aid element, which can be placed anywhere desired and advantageously in an edge area, so that the bag can be easily opened, allowing a free access to the content of the bag, so that the content can be sated without the need for other opening manipulations. This is achieved according to the present invention by making the initial tear zone a weakened area in the packaging material and the weakened zone to be covered with a mass forming a film, so that after the operation of packaging, the content of the bag is protected by the bag and then, to extract the contents of the bag is performed a tracció * n movement. or -folding that breaks the mass that forms the coating film, thus leaving the contents of the bag free. Bag is understood in the sense of the present invention, for example, flat bags, bags with rolled edges, hollow bags (three-dimensional) or tubular bags. Preferred are the sealed edge bags and the tubular bags.

As a flexible packaging material, also referred to as wrapping material, packaging means, packaging sheets, etc., essentially all known flexible packaging materials can be used. The packaging materials must be suitable for processing into machines, that is to say, suitable for use - in packaging machines. Among the packaging materials are paper materials, if necessary lined with waterproof layers and / or synthetic materials, or transparent cellulose materials or aluminum sheets containing packaging materials, such as aluminum sheets provided with sealing layers and in some cases with other layers of synthetic material, or with packaging materials made from sheets of non-thetic material or from sheets of synthetic material that are covered on one or both sides with paper or foil of metal, or packaging materials made from synthetic mate- rials, which contain an impermeable layer, such as a waterproof layer of synthetic material, a waterproof ceramic layer or a metal impermeable layer. As synthetic materials can be used, for example, polyolefins, such as polyethylene or polypropylene, polyamides, polyvinyl chloride or polyester, etc., both as a single sheet, as well as a combination or compound of several sheets or using synthetic materials joined together, such as multilayer composite sheets Between at least two layers can be placed layers of waterproofing, for example waterproofing layers of ethylvinyl alcohol or waterproof ceramic or glass or metal layers. The sheets of synthetic material or the composite sheets can have a thickness, for example between 10 and 100 jum, but preferably between -30 and 50 u. The packaging material can be coated on one or both sides, preferably on the inward facing side of a bag made therefrom, with a sealing layer, for example a sealing varnish or a sealing foil of, for example , polyolefins, such as polyethylene. For example, for waterproof bags sealed at temperature, a sealing layer containing 6 to 7 grams / m of sealing varnish is sufficient. The packaging material is advantageously used as a material in the form of an endless band or in rolls. A weakening point is made in the packaging material in the tear initiation zone provided for the bag. The weakening of the packaging material can be effected mechanically, for example by means of a cutting blade, chemically, for example by means of di solvents, thermally, for example by means of laser beams, in the form of a separating cut, perforation, notching, etc.

The separating partner is preferred. The weakening can be in line subtraction or survation and can be configured in such a way that it extends around the whole contour or parts of the contour of the respectable bag, in the case of -bags made of flexible packaging material. The zone of weakening in the bag recommended in the invensidn is re-covered with a mass that forms a -speak. By "weakening zone" is meant not only the weakening point itself, but also the contiguous parts of the packaging material, for example from the zone-close to the weakening point, which comprises a space of between 2 and 20 mm, but preferably between 5 and 10 mm. The bag recommended in the invention can be -recovered with the mass that forms a film only in the area of the weakening point. However, a bag of this type advantageously is completely covered with the mass that forms the film. The film-forming mass in particular represents the impression of the bag. In an advantageous embodiment of the invention, the film forming mass is thicker in the area of weakening than in the remaining area of the bag. The film forming mass can be a sap or also a holiness of several layers, for example, two, three, soft, without co, six, etc. layers of film-forming masses. The film former raises the previously performed weakening zone and closes it, giving the packaging material again a resistance against traction in the area of weakening. The film-forming mass or the mass-total amount, in the case of the lamination of several sapes-superimposed on each other of film-forming masses, can be advantageously applied in the area of weakening in sanctities of between 2 and 8 g / m, but preferably between 3 and 6 g / m 2 and advantageously between 3.5 and 5 g / m2. Outside the area of weakening, the film-forming dough can be crushed, for example, in sanctities between 1 and 7 gr / m 2, but between 1 and 5 gr / m2 and 2 advantageously between 1 and 4 gr. / m. In order to produce a film-forming mass, for example, it is possible to use paints of volatile components, solvents, and non-volatile components, such as film former, resins, plasticizers, auxiliary agents, dyes, pigments, fillers, etc. Printing inks or film forming masses are preferred, which are solders or pigments, solvents, fillers, other additives and binders. Resins, clear varnishes, nitroselulose, polyamides, vinyl resins, solofonium resins, maleinate resins, gum lasa, etc. are advantageous binders. The solder varnish inks mainly represent printing inks and can be stamped by a printing machine, such as printing on the flexible packaging material previously weakened. The impression represents not only the film-forming mass, but at the same time also the decorative and, in this case, also informative printing for the bags. The printing on the packaging material can be applied on the side of a bag oriented to the outside or also inside or on both sides. As a film-forming mass, it is also possible to use materials processed in plastic form, for example, softened or molten, and can be folded in the form of a film on the packaging material on the side of a bag that is oriented outside or in which it remains inside or on both sides. The pellet forming mass can be crushed - by means of an extrusion coating. For the extrusion of a sheet by extrusion, they are adesuados, for example, materials that are polyolefins, such as polyethylene or polypropylene, or polyvinyl slurry. In the pellet-forming masses, the re-coverings in sapas are also absorbed by means of high-temperature melts., also referred to as overhang fusion masses. These masses are, for example, visso-elastic or visso-plastid materials, solid at normal temperature, preferably made from resins, seras, thermoplastides and elastomers, in their ssn-addition of fillers, antioxidants, lubricants and the like, which when they are released and after passing through a thermoplastic zone, they are converted into viscous or very fluid melts. The film form on the caulking material by means of film forming masses can also be carried out by means of chemical screening paint. The chemically screened paint media are reisolated sromolésulas, which are obtained by means of a chemically reusable and in particular by polymerization. The film-forming masses can also be sheets, in particular sheets are small resistances to breakage by transsidn or are a great fragility. The thicknesses of the sheets can be, for example, between 5 and 20 jams. The printed sheets may contain polyolefins, only polyethylene or polypropylene, polyesters or polyamides. The sheets can be pressed onto the packaging material on the side of a bag oriented to the outside or on the side oriented to or on both sides, it being possible to obtain the adhesion of the sheet or the sheets in the packaging material by glues of resubri ment and / or adhesive agents, in their saso by additionally applying a treatment of sorone, flame, plasma or ozone. For example, the sheet may have sealing properties, especially in the case of the side facing the inside of the bag. In this case, the sheet is at the same time a sealing sapa. The sheet can also be placed as an additional film-forming mass on the packaging material, for the sake of printing it is varnish. In the event that peel-forming masses are applied on the side of the oriented packaging material outside and on the side oriented to the inside, these masses may be the same or different. The materials of the film forming masses are, particularly for the desired purpose, highly innovative and homologous materials for the packaging of food products. Other examples of compositions of formed masses of film on the packaging material are sealing lacquers, for example polyolefins, such as polyethylene, which are piled on the printing ink. The film forming dough is preferably drawn on the oriented side to the outside of the bag. The film forming mass may also be soldered on the side of the bag oriented therein. It can be treated in this case, for example, of the printing ink of a squeeze. A further film-forming mass in the form of a sealing varnish can be located on the printing ink of the shrinkage. The packaging material may also contain on the side of the bag facing outwards a layer of a film-forming dough, for example a printing varnish, and a sealing varnish on the side of the bag oriented therein. The present invention also refers to a prosedimiento for the manufacture of a bag according to the present invention. The profiling can be done advantageously so that in the flexible packaging material - a weakening point is made and at this point of weakening it is coated by means of at least one film forming mass. For example, paints, printing inks, extrusion sheets, high-temperature melts, etc. can be used as film-forming masses. before indexed. In general, these are liquid or melted paint systems. The aplissability of the film forming masses can be effected, for example, by sentri-leakage, Proyessidn, Flooding, pouring, laminating with slurry, spray by brush, by printing, surface extrusion, etc. As a general rule, in the case of flexible packaging materials, this is a continuous material in the form of an endless band, which is why they are especially suitable for resurfacing, such as the supersoft extrusion, the pulverization, the aplissa- rollers, printing or pouring. In an especially preferred process, the flexible packaging material is provided with weakening points in a printing mechanism and the printing is made as printing doughs as a film forming mass. In this process, the flexible packaging material is conveyed to a printing machine, for example a relief printing machine, a rotogravure printing machine, an offset printing machine and, in particular, a flexo printing machine. Examples of printing machines are the printing mesanismos of -plasa antepuesta, the printing machines of several cylinders, of a single cylinder, in-line, flexográfisas and variable plasa, or so binasiones of the same, for example printing machines flexographs and printing machines in gravure. For the desired purpose, in the area of the printing cylinder, before the start of printing or, in the case of several cylinder machines, in the area of the first printing cylinder, the weakening point is made advantageously by means of a so-called "mesanismo de sorte" in the flexible packaging material. The intended impression on the flexible packaging material is effected by the printing process, the weakening zone also being printed, so that the printing varnish saw the weakening zone. The printing lacquer coating is performed, for example, so that in the area of the weakening point the total thickness of the printing lacquer is greater than in the remaining area of the flexible packaging material. Thanks to the regulation of registers, printing operations can be carried out with all accuracy, obtaining, in addition to a clear printed image, especially an exact coating of the weakening point and the zone around the point of weakening by means of the printing varnish. The bags of flexible packaging material manufactured according to the present invention can be used for the packaging of food products are a mixture between powdery and solid. A preferred use is in the packaging of shosolate bars, food products that are starch, food products - which are fat, or prepared food products in the form of mixtures of shosolate are starch and / or food produtus that are fat, and all preparations of alimentary products, preferably in the form of sticks or pills. The packaging of Shosolate bars or the like is preferred, since in the opening tearing operation, in this case the Shosolate bar serves as a point of support for the opening tearing of the bag by bending.

In the case that the bag is made of tubular material, the bags have at their ends a transverse support seal, or in case the bags are made from a non-pliable material, the bags have a longitudinal seam seal and a transverse support seal on one of its ends. The sealing of the supports can be done by means of cold sealing, sealing on the projection or by gluing. In the case of packaging, for example shosholate bars, the weakening point is ensuled advantageously located at one of the two ends of the bag, it is de-sir at approx. 10-30 mm from the end of the bag that is closed with a transverse seal seam. They are specially -preferred tubular bags are a long-term holding seal and transverse support seals at their ends.

If the bag is torn along the weakening point - for its opening, the tearing continues at most around the entire contour of the bag, but the sealing of the longitudinal stock prevents it from tearing. In the longitudinal groove and in the sealing of the longitudinal support, the folded end of the bag is loosened. Then the bag can be easily handled and it can be supplied directly from the package, leaving the bag-piece folded and bending over the longitudinal support, joined to the rest of the bag, so that it is not formed. ma any piece of bag that has to be collected individually or that falls to the ground. Figures 1 to 6 explain in more detail by way of example the present invention. Figure 1 shows schematically the shape of -production of a tubular bag of sontinuous material. Figure 2 shows schematically a view on a tubular bag. Figures 3, 4 and 5 show another tubular bag, seen from the front and rear sides, as well as in the open torn state. Figure 6 shows a section through the packaging material in the area of a weakening point. According to FIG. 1, the packaging material 10, which is already provided with weakening points and for example a coating coating on the weakening points in the form of printing in various colors, is extracted, unwinding, from a feeding roll. and confirmed until the packer operation. The flesha 11 indicates the pressure of the product to be packaged and, together with the introduction of the packaging product, the sealing of the longitudinal support 12 and the sealing the transverse support 13, thus forming the resilient packaging unit 14. A stock device 15 sortates the material, separating it into individual tubular bags 16, are the transverse seams 17 and the longitudinal seam 19. In figure 2 there is reproduced the tubular bag -16. The longitudinal seam 19 is on the back side, while the tubular bag 16 is closed at both ends with transverse supports 17. By means of a line of intermittent points and strokes, the weakening point 18 is indicated. It lies in the area at one end of the tubular bag 16 and is re-coated, for example, they are a printing varnish. Figures 3 and 4 show another tubular bag 16 - are the transverse supports 17 at both ends and are the longitudinal support 19, In figure 4 is drawn by dotted lines and intermittent strokes the debug point 18, which is It is located below the printed drawing made by means of the printing varnish. If a traction force is drawn onto the package, for example by grasping the package by the transverse supports 17 and pulling them to the sides, the packet is separated at the length of the weakening point 18, and pulling it and by For example, by folding the package at the same time, the material of the sheet is scratched, as a rule along a tear line., which is drawn in figure 3 by means of a dotted line. The tear line 20 - ends in the longitudinal support 19, since there has been formed an assumption or thickening of the matrial by means of folding and sealing. In this way, the tubular bag 16 remains open along its contour, ex-psept in the area of the longitudinal support 19, and it can then be easily extracted from its support, for example by hitting the hasia-out from one end. Both parts of the tubular bag 16 are joined together by means of the longitudinal support 19 and can then be disposed of separately. Figure 5 shows the tubular bag 16 are the transverse seams 17 and are the longitudinal support 19 in torn and open form. The part 27, folded to one side, of the bag is attached to the rest of the tubular bag 16 by means of the packaging material of the longitudinal support 17. The opening tear has been made along the weakening point 18 and has it is continued by the tear line 20 up to the longitudinal support 19. The support 26, for example a shosolate bar, of the tubular bag 16 can be either easily extracted or simply torn from the package. Figure 6 shows a session through the packaging material 10 in the area of the weakening point 18. The weakening point 18 has been made, for example, in a sheet of synthetic material 21 and the weakening point 18 represents a Sorte of separation through the sheet of synthetic material. On the sheet of synthetic material 21, on the side of the bag oriented towards the outside, there is a multi-layered printing, as a rule in several colors, with the printing varnishes 23, 24 and 25. When making the configuration of the In printed form, an additional layer of a printing varnish 24 has been applied in the area of the weakening point 18, -the total thickness of the printing lacquer is increased by the rest of the packaging material. 10 and the zone of weakness is safely covered, being serrated, thus providing the packaging material 10 again with a resistance against the transference. According to the documents, the packaging material 10 can be folded on its side of the bag oriented towards a sealing cup 22, in particular a sealing varnish. The sealing barrel 22 preferably serves for the subsequent sealing of the supports, but it can also reinforce the appearance of the printing varnish 23, 24 and 25. The bags of the present invention, which are re-covered are films of film forming masses, are Preferably tubular bags made from sontinuous material.

Claims (13)

1. Resurfaced bag are film forming masses, manufactured from flexible packaging material, they are an opening tear zone, sarasterized because the tear opening area is a weakening point in the packaging material and the weakening point zone It is re-covered are at least one forming mass -of a film, and after the packaging operation, the are have been protected by the bag, and for the extras of the bag's contents a transference or bending movement is carried out, which breaks the film forming dough that resumes the bag and leaves the bag free.

2. Bag according to claim 1, characterized in that the film forming mass or the film forming masses are thicker in the area of the weakening point than in the remaining area of the bag.

3. Bag according to claim 1, characterized in that the film forming mass or the film-forming masses are crushed in the area of the weakening point in sanctities of between 2 and 8 gr / m, but conveniently between 3 and 6 g / m 2 and advantageously between 3.5 and 5 g / m2.

4. Bag according to claim 1, characterized in that the weakening point is a perforation or a separation gap and because the weakening point extends throughout the whole or a parsial area of the bag outline.

5. Bag according to claim 1, sarasterized because the weakening point is realized by the contents of the bag in an area of the edge.

6. Bag according to claim 1, characterized in that the packaging material contains at least one film-forming dough in the form of an imprint by means of varnish inks, preferably oriented in the bag to the outer side.

7. Bag according to claim 1, characterized in that the packaging material contains at least one sealing bag, preferably a sealing bag facing the inner side of the bag.

8. Bag according to claim 1, characterized in that the bag has at its ends transverse support seals or because the bag has a longitudinal seam seal and at its ends are sealed transverse seams.

9. Bag according to claim 1, sarasterized because the bag is a tubular bag manufactured from material sontinuo.

10. Probeing to manufacture a bag according to claim 1, which is sarasterized because a weakening point is made in the flexible packaging material and this weakening point is resurfaced by means of at least one film-forming mass.

11. Procurement according to Claim 10, which is sarasterized because in the flexible packaging material the weakening point is made in a printing machine and the weakening point is re-coated in the printing machine by means of printing, by means of at least - a sap of printing varnish.

12. Utilization of the bag made according to claim 1, for the packaging of foodstuffs in powdery to solid consistency.

13. Utilization of the bag according to claim 12 for the packaging of Shosolate bars, food products that are starch, food products that are fat or mixtures of shosolate are foodstuffs that are starch and / or fat.