DE102004059138A1 - Composite sheet for producing packaging tubes comprises layer of sealable material and coextruded second layer which has zones carrying printing with zones made from different material on either side - Google Patents

Abstract

The composite sheet for producing packaging tubes comprises a layer (12a) of sealable material and a coextruded second layer (14a). This has zones (18a) which carry printing (24a) and have zones (20a) made from a different material on either side. Independent claims are included for: (A) Tubes made from the composite sheet; and (B) a method for making semi-finished tubes from the sheet.

Description

The Invention relates to a container composite film, in particular tube composite foil with several to a layer stack flat interconnected layers, of which at least two layers a sealable Coextrusion composite form.

Composite films of this type are for example from the EP 0 939 037 A1 known. For the manufacture of tubes, blanks of such a composite foil are rolled into a tube which is sealed along the marginally overlapping margins of the blank. The closure head of the tube is then subsequently attached to a tubular tube blank. After filling the tube, the end of the tube blank facing away from the closure head is closed.

conventional Composite films for Tubes or the like are usually between 200 to 700 microns thick to one for To ensure the use of sufficient rigidity of the tube. The outer layers of the layer stack of the composite film usually consist of the same sealable Material to the edges of the foil blank to the tubular To permanently connect the tube blank. Between the outer sealing layers are at conventional Laminated films metal foils or other barrier layers arranged, the migration of substances of the tube contents to the outside or Prevent the penetration of substances into the tube contents.

In As a rule, tubes are printed with a decorative imprint. conventional the already finished composite foil is printed on its outside, mostly in the printing press (high pressure), in order at the comparatively thick composite films to compensate for unavoidable thickness tolerances to be able to. Should in this printing technique, however, high-quality, multi-colored decorations are printed, this requires expensive printing machines, which disproportionately increase the production costs.

From the EP 0 939 037 A1 It is also known to print the respective outer film of the composite film on its outer side or in reverse printing on its inner side and then to laminate it against further layers of the composite film. This outer film is possibly transparent, so that intermediate layers, such as a metallization layer or a hologram layer, are also visible from outside. In this way, the outer layer to be printed can be made thinner, so that due to the reduced thickness tolerances of the print can also be printed in many colors in a planographic printing process, such as in the offset printing process. Although the tube in such a planographic printing process can be multicolored and decorated with in most cases sufficient quality, but achievable with conventional composite films print quality is not always higher demands.

It Object of the invention is a composite film for the production of containers, in particular tubes which can be sufficiently printed even for high requirements and beyond that permanently to containers, especially tubes, can be processed.

The invention is based on a conventional container composite film, in particular tube composite film, as for example from the EP 0 939 037 A1 is known, with a plurality of layers stacked together to form a layer stack, of which at least two layers form a sealable coextrusion composite.

outgoing From such a composite film, the above object is achieved by the invention solved, that the coextrusion composite is a first layer of sealable material and a covering the first layer surface and comprising second layer co-extruded with the first layer, wherein the second layer in coextruded form at least one on his The first layer facing away from the surface provided with a decorative print first layer region and transverse to the extrusion direction on both sides second layer areas adjoining the first layer area from one, different from the material of the first layer area, sealable Material has.

With such a construction of the composite film, the material properties of the first layer and second layer regions consisting of sealable material and the first layer region bearing the imprint can be independently selected. Thus, the material of the first layer region can be selected independently of the decisive for the production of the container blank, in particular the tube sealing ability primarily from a printing technical point of view, especially the required in the printing process dimensionally stable properties such as the stiffness, the yield stress, the elongation at yield stress, the elongation at break, the tensile modulus of elasticity, the bending stiffness and the permeability and the light transmittance. In addition to the printing requirements but also films can be selected according to that they have additional functions such as barrier functions to gases and liquids be to sit. It has been found that materials chosen from the point of view of printing technology already have better barrier properties, for example for oxygen and / or aroma permeability, than the materials usually selected for the sealable layers.

There at the first selected from the pressure-technical point of view Layer region transverse to the extrusion direction on both sides of second layer regions one different from the material of the first layer region, sealable Connect material, the coextrusion composite has edge regions which are continuous made of sealable Material consist, ensuring a trouble-free seal and in the sealed (welded) condition the tube - ideally Push on Shock - a continuous, shapely and resilient Seam can be produced.

In in the event that it is due to the different physical and chemical properties of the imprint-bearing layer area on the one hand and the existing of a sealable material first layer and second layer regions to no fixed connection at the contact surfaces but only for a repression the different materials comes in the contact area can be provided that between the first layer and the second Layer one coextruded with the first layer and the second layer Adhesive layer for connecting the first and the second layer provided is that between the first and the second layer area one coextruded with the first and second layer regions Adhesive layer region for connecting the first and the second layer region is provided. Alternatively, however, it can also be provided that the first layer is made of a material which is attached to the material the first layer region and the material of the second layer region the second layer liable is, whereby at least the adhesive layer for connecting the first and the second layer can be omitted. But it would be possible Also, this material of the first layer also to the compound of first layer region and the second layer region to use.

Farther can be provided that a third, at least on their from Extruded composite side facing away from sealable material existing layer by means of a laminating layer facing away from the first layer area the second layer and / or facing away from the second layer area the first layer is connected. Here, the third layer be formed as a single-layer film. But the third layer can also take over other functions and formed as a multilayer, coextruded or laminated layer composite which, for example, a metallization layer and / or Hologram layer and / or a migration of substances into the container or from the container interior out preventing barrier layer comprises. Alternatively or also additionally can also be provided that on the formation of the container inside certain layer a barrier layer to reduce the permeability of the composite film for oxygen or / and Aromastoffe applied, in particular in a plasma process or An electron beam method is applied.

Farther It can be provided that a plurality of first layer regions transverse to Extrusion direction are provided side by side and that between A second layer region is provided in each case for the first layer regions is what makes it possible is to produce a composite film from which at the same time a Variety of tube blanks can be made and in the case of it in a subsequent printing is possible over its entire area width to print, which is necessary with many motives. Furthermore allows this embodiment an exact positioning of the first layer areas, which is a very allows accurate printing, which in a separate supply of individual Printing foils not possible would. Around the print results in addition can be further provided that the second layer at least one markable coextruded marking area which, for example, as a reference mark for positioning the composite foil during printing or cutting is used.

Farther For example, the first layer region of the second layer may be a single layer be printed with a decorative print, the imprint is not only on the later Container outside, but also in the counter pressure possibly also on the inside can be, as far as all between the decorative imprint and at least one of the outer surfaces of the Laminate in the stack of layers layers of transparent, the view of the print enabling Material exists. To increase the variation of the decoration, can but also the third layer at least on one of their two surfaces may be provided with a decoration imprint and / or may be the first layer Be provided on its side facing away from the second layer surface with a decoration imprint.

The first layer region, which covers the decorative print, preferably consists of a material with a higher melting temperature than the sealing temperature of the sealable layers or / and the sealable layer regions or / and has a lower elongation at break than the sealable layers or / and sealable layer regions or / and has a larger one Tensile elastic modulus as the sealable layers and / or sealable layer regions. Such a trained first layer area warps less in a printing press than the sealable material used for example for the first layer and can therefore be printed exactly.

When Material for the first layer region is for example polyethylene, Polypropylene, copolymers or copolymers and graft polymers or block polymers of the above-mentioned substances, polyester or modified blends of thermoplastic polyester or other polymers as well as polyamide.

Under one with itself or / and the material of the other sealable layer sealable layer is here and below not just a layer from thermally fusible and thus weldable material understood but, in general, materials that are made by solving a solvent or by applying an adhesive mechanically strong together can be connected.

When sealable Materials are, for example, polyethylene, metallocenes catalyzing polyethylene, ionomer resin, polypropylene or also Mischpolymere or Copolimerisate, graft polymers or block polymers or so-called polymer blends of the above-mentioned substances.

The Thickness of each layer can easily meet the purpose selected accordingly become. For example, for example, for training the container inside certain sealable third layer have a thickness between 100 and 500 microns, so this layer in First, the stiffness of the tube wall determined. Furthermore For example, the sealable first can be used to form the outside of the container Layer have a thickness between 20 and 250 microns, which has the advantage that this layer can also be printed if necessary. The first Line for a printing provided second layer may have a thickness between 20 and 400 μm have, wherein the layer thickness used in particular according to the used Directed printing process. About that In addition, the coextruded adhesive layer or the coextruded Adhesive layer area have a thickness between 20 and 100 μm, so that the thickness of this layer hardly affects the total thickness of the film composite.

Furthermore The present invention relates to a container, in particular a tube with one of a foil blank of a composite film according to the invention existing wall, wherein the two second layer areas in the seam area of container are arranged.

For the production a container blank, specifically a tube blank, becomes a first layer of sealable material simultaneously with a first layer covering the second layer with several side by side provided transversely to the extrusion direction first layer regions and transverse to the extrusion direction on both sides at each of the first layer areas subsequent second layer areas from one different from the material of the first layer area, sealable Material coextruded. After that, at least the first layer area be printed with a decorative print, the pressure can be done in normal or counter pressure. This can be a foil blank be made, which has a first layer area and both sides second layer areas adjoining the first layer area wherein the foil blank for the container blank approximately along the Center of every second layer area is done. Finally, it will the foil blank tubular curled up, leaving the edges the two second layer areas are assigned to one another or opposite each other after which the associated edges of the foil blank overlap or butt-end-sealed to each other.

In in the event that that for the first layer areas did not use material for the first one Layer and the second layer regions used sealable material compatible, can coextrusion at the same time Layer and the second layer an adhesive layer for connection the first and second layers can coextrude simultaneously with the coextrusion of the first layer region and of the second layer region, an adhesive layer region for connection of the first and second layer regions are coextruded.

Around an exact alignment of the coextruded composite film during a Printing process or a subsequent foil blank to allow may be at least simultaneous with the coextrusion of the second layer a marker region serving as a label is coextruded.

Furthermore can be provided that after printing the first layer area a third, at least on their side facing away from the extrusion composite made of sealable Material existing layer by means of a laminating against the surface facing away from the first layer of the second layer and / or the surface of the first layer facing away from the second layer is laminated becomes.

In order to allow additional decoration may further be provided that the third sealable layer before or after the lamination printed on at least one of its two surfaces with a decorative print. If desired, an additional decoration can also take place in that the first sealable layer is printed with a decoration imprint.

Prefers becomes the third sealable Layer "in line" in a decorative print printing press laminated against the first or second layer. It is understood, however, that the lamination process also independent of the printing press in a later Work step performed can be.

The preferred, for the above explained Manufacturing processes used sealing techniques, with which the mutually associated edges of the Foil blank, for example, be butt-sealed with each other, include heat sealing, induction welding or high-frequency welding. But there are also other sealing techniques applicable, the targeted Melting possibly only the surfaces of the interconnected film edges allow.

in the The invention will be explained in more detail with reference to a drawing. It represent:

1 a not to scale partial cross section through a suitable for the production of a container blank, in particular a tube blank composite film according to a first embodiment;

2 a not to scale partial cross section through a suitable for the production of a container blank, in particular a tube blank composite film according to another embodiment;

3 a not to scale partial cross section through a suitable for the production of a container blank, in particular a tube blank composite film according to another embodiment;

4 a not to scale top view of a flat die used for the coextrusion; and

5 a schematic not to scale partial cross-section through the seam region of a tubular tube blank.

1 shows a not to scale cut through a composite film 10 for tubes in the form of a coextruded layer stack according to a first embodiment. The composite foil comprises a first layer 12 from sealable, here thermally weldable material and a first layer 12 flat overlapping and with the first layer 12 coextruded second layer 14 , To connect the first layer 12 and the second layer 14 serves an adhesive layer 16 , which coincide with the first layer 12 and the second layer 14 is coextruded. As can be seen, the second layer comprises 14 a plurality of transverse to the extrusion direction (which is orthogonal to the page plane) side by side provided first layer areas 18 and on both sides of each of the first layer areas 18 subsequent second layer areas 20 from one of the material of the first layer region 18 different, sealable material.

The first layer area 18 serves as a print carrier and is on his of the first layer 12 opposite surface with a at 24 hinted decoration print provided. In addition to the already mentioned adhesive layer 16 which is the first layer 12 and the second layer 14 connects is between the first layer area 18 and the second layer area 20 one with the first layer area 18 and the second layer area 20 coextruded adhesive layer area 22 for connecting the first layer region 18 and the second layer region 20 intended. As can further be seen, the first layer region lies 18 and the second layer area 20 plan next to each other and be through the first layer 12 strengthened or supported what allows it, the second layer 14 form almost any thin, in order to be printed exactly in the planographic printing, but without having to pay attention to the handling or strength of the second layer area. In addition, the first and second layer areas arranged side by side permit one another 18 and 20 to be printed over their entire area width, as in 26 indicated where the decoration print 24 of the first layer area 18 in the second layer area 20 extends into it.

The first shift 12 ie the in 1 The uppermost layer is designed primarily according to aspects of weldability and optimum seam strength. At the same time, however, the film must also have transparent or highly transparent properties, which is necessary if the printing as in 24 indicated on the inside of the entire composite, for example in the case of "reverse gravure printing." The first layer 12 but can also be present in a colored form, for example in particular nacre optics, etc. To improve the whiteness of the first and the second layer 12 and 14 These layers can be provided with additional additives such as TiO ₂ , giving the film a more brilliant white appearance. In this case, however, it is necessary that the first layer area 18 and the decorative print attached to it 24 lies on the outside of the entire composite.

Even if, as in 1 represented, the decorative imprint on the inside of the entire composite and all between the decorative print 24 and at least one of the outer surfaces 28 the composite film in the stack of layers layers of transparent, the view of the imprint-enabling material may consist of the first layer 12 on her from the second layer 14 opposite surface 28 with another, at 30 be indicated decorative imprint provided, which, however, may be omitted if necessary. In order to enable a more exact positioning of the individual layer areas, for example during the printing process or a film blank, has the composite film 10 additionally in the second layer 14 a co-extruded marking area serving as a marker 32 on.

For the production of the composite film, the first layer 12 made of sealable material simultaneously with the first layer 12 flat overlapping second layer 14 with several transverse to the extrusion direction side by side provided first layer regions 18 and transverse to the direction of extrusion on both sides of each of the first layer areas 18 subsequent second layer areas 20 from one of the material of the first layer region 18 different, sealable material coextruded. Following this, at least the first layer area 18 with the decoration imprint 24 printed, where appropriate, the first layer 20 with a decoration imprint 30 can be printed.

For the production of a tube blank, foil blanks are produced from the extruded and ready-printed composite foil, each of which has a first layer area 18 and on both sides of the first layer area 18 subsequent second layer areas 20 wherein the film blank for a container blank in the extrusion direction approximately along the center of each second layer region 20 runs as shown schematically in 1 A, wherein A schematically denotes the distance between the individual transverse to the extrusion direction to be performed cuts of a foil blank or the transverse use, which also corresponds approximately to the tube circumference. These film blanks are then rolled and sealed together along their opposite edges, using conventional methods, in an overlap seam or a flush butt weld (see also Figs 5 ). Since the seam region of the tube blank, in particular in the case of a seal shock on impact, due to the layer structure of the composite film is completely made of sealable material, a continuous and therefore safe and resilient weld can be produced. To the tube blank is finally attached at one end in the usual way provided with a closure tube head.

While that for the first shift 12 and the second layer area 20 sealable material used is chosen primarily in terms of weldability or optimum seam strength and, if necessary, sufficient transparency, is the material of the first layer region 18 selected from the standpoints of optimum printability and meets the required in the printing process dimensional stability properties such as stiffness, yield stress, elongation at yield stress, elongation at break, tensile modulus, bending stiffness and permeability and translucency. The thickness of the second layer 14 Therefore, to reduce thickness tolerances, it may be between 20 and 450 microns thick while the first layer 12 may have a thickness between 20 and 250 microns, which can be additionally printed in particular at a smaller thickness. In addition, the coextruded adhesive layer 16 or the coextruded adhesive layer region 22 have a thickness between 2 to 100 microns, so that the total thickness of the composite film is hardly affected.

In the 2 and 3 Further embodiments of the composite film according to the invention are shown, where components which correspond to components described above in terms of structure or function, there are provided with the same reference numerals and additionally each with the index "a" or "b". In the following, only the structural differences between the respective embodiments described above will be discussed.

The composite film according to the 2 differs from the composite film described above essentially only in that the composite film 10a in addition to the first layer 12a and the second layer 14a a third layer 34a which, at least on its side facing away from the extrusion composite side of sealable material. The third layer 34a is in 2 by means of a laminating layer 36a with the from the first layer 12a opposite surface of the second layer 14a but may additionally or alternatively be connected to that of the second layer 14a opposite surface of the first layer 12a be connected as through 38a (which of course also in the first embodiment according to 1 possible where this third layer is at 38 is indicated).

The third layer 34a can be designed as a monofilm. It can also be used as a composite multiple coextruded or laminated films or films and so take over more functional tasks. So can, as with 40a indicated, the layer composite comprise a metallization layer, hologram layer or a barrier layer, which prevents the migration of substance content of the tube to the outside or even of substances from outside to inside. Furthermore, as with 42a indicated on the particular for forming the container inside layer, in this case the third layer 34a , a barrier layer may be provided in vapor-deposited form, which may also have a barrier function to reduce the permeability of the composite foil to oxygen or flavoring agents. In addition, the third layer indicates 34a , as in 44a indicated on her second layer 14a facing surface on a decorative imprint, which, however, if desired, alternatively or additionally on that of the second layer 14a opposite surface of the third layer 34a can be provided.

For the production of the composite film of the first layer 12a and the second layer 14a coextruded composite and possibly the third layer 34a with the decoration imprint 24a respectively. 30a and 44a printed, with the layers 12a . 14a and 34a can initially be printed separately from each other before they by means of Kaschierschicht 36a be laminated against each other. It is understood that the third layer 34a if this is to be printed only on the outside, if necessary, also against the second layer first 14a or the first layer 12a is laminated and only then printed.

In the 3 illustrated composite film 10b is based essentially on the above-described composite film according to 1 , but with the difference that in this embodiment the first layer 12b is made of a material which is attached to the material of the first layer region 18b and the material of the second layer region 20b the second layer 14b is liable, so that in the embodiment of the 1 provided adhesive layer 16 for connecting the first layer 12 and the second layer 14 can be omitted. However, in this embodiment, the first layer areas are 18b and the second layer areas 20b furthermore via coextruded adhesive layer areas 22b connected with each other.

4 schematically shows a flat nozzle or slot die 50 from above, which for example for coextrusion of the composite film 10 according to the first embodiment 1 is used. For this purpose, the different materials are fed by transverse extrusion (transverse to the drawing direction or running direction), whereby exactly in the machine direction (orthogonal to the sheet plane) a first layer 12 made of sealable material as well as a first layer 12 flat overlapping second layer 14 with a first layer area 18 and transverse to the direction of extrusion on both sides of the first layer region 18 subsequent second layer areas 20 from a sealable material different from the material of the first layer region can be generated flat side by side.

The Fact that it is due to the different physical and chemical properties of different material areas not to merge at the contact surfaces, but only to a repression the different materials in the contact area can, allowed, exactly demarcated and dimensionally stable Produce areas and layers technically. By the different ones Flow rates or the screw speeds of the extruder, the respective Width of each layer areas are set exactly. By the constant take-off speed remains the respective width also constant in running direction. The achievable tolerances of the individual layers is about ± 0.5 mm. By adapted use of the extruder and design of the flow channels it is thus possible several lying in the direction of transverse use with different Produce layer areas whose dimensionally accurate arrangement extremely important is. In the same way also for the connection of the individual layers or layer areas used adhesion promoter as well as a marking area in transversal Be incorporated direction. The molten extrudate gives way the Koextrusionsvorgang with a final film thickness from the slot die and is cooled on a so-called "chill-roll", subtracted and wrapped in subsequent stations or directly to tube blanks be further processed.

film blanks conventional Composite films can for the Production of a tubular Tube blanks in an overlap seam mutually associated edges the film blank are connected or welded. The overlap seam impaired but often the external appearance the tube. The appearance can be significantly improved when the edges facing each other a foil blank butt-joined together, in particular be welded together. Because of the comparatively However, the low thickness of a composite film is the mechanical strength Such a butt weld often insufficient, with the result that the tube can burst at the seam when pressed, in particular, if the composite film does not contain sealable layers.

As in 5 which shows a schematic partial cross section through the seam area ei from the composite foil 10a of the second embodiment (which is chosen only by way of example) produced tubular tube blank 52a However, it may be for the production of the tubular tube blank 52a used foil blank 54a whose length corresponds to the desired tube length and the width of the transverse A of the 2 corresponds to be made such that with 56a designated seam area of the tube blank 52a completely made of sealable material, namely the sealable material of the first layer 12a , the sealable material of the second layer areas 20a and the sealable material of the third layer 34a , which, despite the small thickness of the composite film 10a a firm and permanent seam 56a can be generated.

The sealable material used for the first layer 12 , the second layer area 20 and the third layer 34 may be high density polyethylene (HDPE), ie having a density greater than 0.944 g / cm ³ , medium density polyethylene (MDPE) having a density of 0.926 to 0.944 g / cm ³ , linear medium density polyethylene (LMDPE) having a density of 0.926 to 0.940 g / cm ³ , low density polyethylene (LDPE) having a density of 0.910 to 0.925 g / cm ^3, and linear low density polyethylene (LLDPE) having a density of 0.916 to 0.925 g / cm ³ . Also suitable are polyolefin types which are marketed, for example, under the names Lupolen, Hostalen or Lupolex by Basell.

To but are also metallocene catalyzing polyethylene on PE base, which sold for example under the brand Luflexen by the company Basell whose advantages are high transparency with good sealing properties are.

Of Furthermore, this layer can also consist of ionomer resin, which For example, sold under the brand Surlyn by the company. Du Pont. This material may be used alone or as a mixture with those described Polymers are used to increase the transparency, sealing properties of the films used.

Farther suitable are polypropylene amorphous, crystalline or highly crystalline Polypropylene or mixtures thereof and atactic, isotactic or syndiotactic polypropylene or mixtures thereof.

Suitable but are also mixed polymers or copolymers, graft polymers or block polymers or so-called polymer blends from the above Substances. Copolymers of propylene or ethylene, which are hereby Random copolymers, block copolymers, static copolymers or graft copolymers can act dependent on the melt viscosity, the melting temperature and the polyethylene / polypropylene ratio the Achieve high seal strength with polyethylene-based Favoring tube laminates. For example, under the brand Clyrell of the Company Basell sold or polypropylene homopolymers, for example such as that sold under the brand Metocene by the company Basell.

to Achieving special degrees of mattness or soft touch effects the sealable first Layer can special polyolefins such as those under the brand Adflex used by Basell company or other types of polymers become.

In the materials for forming the first layer region 18 it may be high density polyethylene (HDPE) with a density greater than 0.944 g / cm ³ , medium density PE (MDPE) with a density of 0.926-0.944 g / cm ³ , linear density medium density polyethylene (LMDPE) with a density from 0.926-0.940 g / cm ³ , low density PE (LDPE) having a density of 0.910-0.925 g / cm ³ , linear low density polyethylene (LLDPE) having a density of 0.916-0.925 g / cm ³ ). Polyolefin types, such as those marketed under the names Lupolen, Hostalen or Lupolex by Basell, are particularly well suited for use in this layer.

To Metallocenes are also called catalytic polyethlene on PE Base, such as those under the brand Luflexen by the company Basell whose advantages are a high transparency.

Suitable are also polypropylene amporphes, crystalline or highly crystalline Polypropylene or mixtures thereof. Atactic, isotactic or syndiotactic polypropylene or mixtures thereof. Polypropylene homopolymers show good mechanical properties such as stiffness, elongation at break or stretching at yield stress, for example, like that under the Trademarks Metallocenes or Adstif sold by Basell Metallocenes catalyzing polymer. Also to be mentioned are copolymers or Random copolymers such as those under the trademark Clyrell of Company Basell distributed.

Also suitable are mixed polymers or copolymers and graft polymers or block polymers of the abovementioned substances. The use of copolymers of propylene and ethylene, which may be random copolymers, block copolymers, static copolymers or graft copolymers, depending on the melt viscosity, the melting temperatures and the polyethylene / polypropylene ratio to achieve a high seal seam strength favor with polyethylene-based tube laminates.

Farther suitable is polyester (e.g., polyalkylene terephthalate, polyalkylene isophthalate or polyalkylene phthalate or analogous naphthalates with typically Alkylene groups having 2 to 20 carbon atoms or by at least an oxygen atom interrupted alkylene groups of 2 to 60 carbon atoms or copolymers of the underlying monomers with glycol or other polyhydric alcohols, which is particularly useful the Copolymer of terephthalic acid and ethylene glycol with another glycol or glycol-modified Polyester - so-called PETG, but also others typically referred to as A-PET, PETP or G-PET Types are).

Furthermore are suitable mixtures of thermoplastic polyester or other polymers, preferably polyester of ethylene glycol or terephthalic acid (= Polyethylene terephthalate, PET) and cycloolefin copolymer COC or metallocene - polymerized COC (MCOC). COC are generally homopolymers or copolymers which a highly transparent surface exhibit.

Furthermore suitable is polyamide. The polyamides include, for example, polyamide 6, a homopolymer of epsilon-caprolactam (polycaprolactam); Polyamide 11, polyamide 12, a homopolymer of omega-laurolactam (Polylaurolactam); Polyamide 6,6, a homopolycondensate of hexamethylenediamine and adipic acid (Polyhexamethylene adipamide); Polyamide 6,10, a homopolycondensate hexamethylenediamine and sebacic acid (polyhexamethylene sebacamide); Polyamide 6,12, a homopolycondensate of hexamethylenediamine and dodecanedioic acid (polyhexamethylenedodecanamide) or Polyamide 6-3-T, a homopolycondensate of trimethylhexamethylenediamine and terephthalic acid (polytrimethylhexamethylene terephthalamide), as well as mixtures thereof.

In the adhesive layer 16 or the adhesive layer area 22 it is an extrusion laminated layer which has the function of providing a permanent and strong bond between the first layer 12 and the second layer 14 or the first layer area 18 and the second layer area 20 to create. The use of such a layer is necessary if melting or fusing of the various polymers at the contact points is not possible. The compound of the layer is then brought about with the adhesion promoter. Suitable adhesion promoters are, for example, vinyl chloride copolymers, vinyl chloride-vinyl acetate copolymers, polymerisable polyesters, vinylpyridine polymers, vinylpyridine polymers in combination with epoxy resins, butadiene-acrylonitrile-methacrylic acid copolymers, phenolic resins, rubber derivatives, acrylic resins, acrylic resins with phenol or epoxy resins, or organosilicon compounds, such as organosilanes.

To also called EAA (ethylene acrylic acid) or modified polyolefins. Examples of modified polyolefins are acid-modified polyolefins and thus plastics, formed by graft modification of a polyolefin with ethylenically unsaturated carboxylic acids or their anhydrides. As base polymers of the polyolefins, e.g. Lower polyethylene Density, medium density polyethylene, high density polyethylene, linear low density polyethylene, homopolypropylene, ethylene-propylene Copolymers, polybutene-1, polypentene-1, butene-1-propylene, copolymers and butene-1-propylene-ethylene terpolymers.

Prefers are homopolypropylene and ethylene-propylene copolymers.

Examples for the ethylenically unsaturated carboxylic acids or their anhydrides are acrylic acid, methacrylic acid, maleic acid, fumaric acid, crotonic, itaconic, Oitraconsäure, 5-norbornene-2,3-dicarboxylic acid, maleic anhydride, Oitraconsäureanhydrid, 5-norbornene-2,3-dicarboxylic acid anhydride and tetrahydrophthalic anhydride.

maleic anhydride is preferred to call. Preferred is an acid group content in the acid modified Polyolefins from 0.01 to 20 parts by weight per 100 parts by weight of plastic, calculated as carboxyl groups (= CO).

The preferred modified polypropylene or polyethylene is an adduct from maleic anhydride and an ethylene-propylene copolymer. To call here is the extrudable primers marketed under the Admer brand by Mitsui.

Further suitable adhesion promoters are adhesives such as nitrile rubber-phenolic resins, epoxies, acrylonitrile-butadiene rubber, urethane-modified acrylics, polyester-co-polyamides, hot-melt polyesters, crosslinked with hotmelt polyester polyisocyanates, polyisobutylene modified Styrene-butadiene rubbers, urethanes, ethylene-acrylic acid copolymers and ethylene vinyl acetate copolymers.

Also to be mentioned are mixed polymers or polymer blends consisting of base polymers or also of modified polyolefins, which bring about an adapted melting temperature, melt viscosity, melting on to other types of polymers at the contact points, and thereby a permanent and firm connection even to incompatible Can produce plastics.

Claims (28)

Container composite film, in particular a tube composite film having a plurality of layers which are connected to one another in a layer stack ( 12 . 14 . 38 ; 12a . 14a . 34a . 38a ; 12b . 14b ), of which at least two layers ( 12 . 14 ; 12a . 14a ; 12b . 14b ) a sealable coextrusion composite ( 12 . 14 ; 12a . 14a ; 12b . 14b ), characterized in that the coextrusion composite ( 12 . 14 ; 12a . 14a ; 12b . 14b ) a first layer ( 12 ; 12a ; 12b ) of sealable material and a first layer ( 12 ; 12a ; 12b ) surface covering and with the first layer ( 12 ; 12a ; 12b ) coextruded second layer ( 14 ; 14a ; 14b ), wherein the second layer in coextruded form at least one on its first layer facing away from the surface with a decorative print ( 24 ; 24a ; 24b ) provided first layer area ( 18 ; 18a ; 18b ) and transverse to the direction of extrusion on both sides of the first layer region ( 18 ; 18a ; 18b ) subsequent second layer areas ( 20 ; 20a ; 20b ) from one of the material of the first layer region ( 18 ; 18a ; 18b ) has different, sealable material. Composite foil according to claim 1, characterized in that between the first layer ( 12 ; 12a ) and the second layer ( 14 ; 14a ) one with the first layer ( 12 ; 12a ) and the second layer ( 14 ; 14a ) coextruded adhesive layer ( 16 ; 16a ) for connecting the first layer ( 12 ; 12a ) and the second layer ( 14 ; 14a ) is provided. Composite foil according to claim 1, characterized in that the first layer ( 12b ) consists of a material which on the material of the first layer region ( 18b ) and the material of the second layer region ( 20b ) of the second layer ( 14b ) is liable. Composite film according to one of claims 1 to 3, characterized in that a third, at least on its of the extrusion composite ( 12 . 14 ; 12a . 14a ) side facing away from sealable material layer ( 38 ; 34a . 38a ) by means of a laminating layer ( 36 ; 36a ) with that of the first layer ( 12a ) facing away from the second layer ( 14a ) and / or the second layer ( 14 ; 14a ) facing away from the surface ( 28 ; 28a ) of the first layer ( 12 ; 12a ) connected is. Composite foil according to claim 4, characterized in that the third layer ( 34a ) is formed as a single-layer film or as a multilayer, coextruded or laminated layer composite. Composite foil according to claim 5, characterized in that the layer composite has a metallization layer ( 40a ) or / and hologram layer ( 40a ) and / or a barrier to migration of substances preventing barrier ( 40a ). Composite foil according to one of claims 1 to 6, characterized in that a plurality of first layer regions ( 18 ; 18a ; 18b ) are provided side by side transversely to the extrusion direction and that between the first layer regions ( 18 ; 18a ; 18b ) a second layer area ( 20 ; 20a ; 20b ) is provided. Composite film according to one of claims 1 to 7, characterized in that between the first layer region ( 18 ; 18a ; 18b ) and the second layer area ( 20 ; 20a ; 20b ) with the first layer area ( 18 ; 18a ; 18b ) and the second layer area ( 20 ; 20a ; 20b ) coextruded adhesive layer region ( 22 ; 22a ; 22b ) for connecting the first layer region ( 18 ; 18a ; 18b ) and the second layer area ( 20 ; 20a ; 20b ) is provided. Composite foil according to one of claims 1 to 8, characterized in that at least the second layer ( 14 ; 14a ) at least one markable coextruded marking region ( 32 ; 32a ). Composite film according to one of claims 1 to 9, characterized in that on the particular formation of the container inner side layer ( 34a ) a barrier layer ( 42a ) is applied to reduce the permeability of the composite film for oxygen and / or flavoring agents, in particular in a plasma process or an electron beam method is applied. Composite film according to one of claims 1 to 10, characterized in that all between the decorative print ( 24 ; 24a ; 24b ) and at least one of the outer surfaces ( 28 ; 28a ; 28b ) of the composite film ( 10 ; 10a ; 10b ) in the layer stack ( 12 . 14 38 ; 12a . 14a 34a . 38a ; 12b . 14b ) of transparent, the view of the imprint ( 24 ; 24a ; 24b ) permitting material. Composite film according to one of claims 1 to 11, characterized in that the decorative print ( 26 ; 26a ; 26b ) of the first layer region ( 18 ; 18a ; 18b ) into the second layer region ( 20 ; 20a ; 20b ) extends into it. Composite foil according to one of claims 4 to 6, characterized in that the third layer ( 34a ) at least on one of its two surfaces with a decorative print ( 44a ) and / or that the first layer ( 12 ; 12a ; 12b ) on her from the second layer ( 14 ; 14a ; 14b ) facing away from the surface ( 28 ; 28a ; 28b ) with a decoration ons print ( 30 ; 30a ; 30b ) is provided. Composite film according to one of claims 1 to 13, characterized in that the decorative print ( 24 ; 24a ; 24b ) carrying first layer area ( 18 ; 18a ; 18b ) of a material having a higher melting temperature than the sealing temperature of the sealable layers ( 12 . 38 ; 12a . 34a . 38a ; 12b ) and / or the sealable layer areas ( 20 . 20a ; 20b ) and / or lower tear-elongation capability than the sealable layers ( 12 . 38 ; 12a . 34a . 38a ; 12b ) or / and sealable layer regions ( 20 . 20a ; 20b ) and / or greater tensile modulus of elasticity than the sealable layers ( 12 . 38 ; 12a . 34a . 38a ; 12b ) or / and sealable layer regions ( 20 . 20a ; 20b ) Has. Composite foil according to one of claims 1 to 14, characterized in that the third layer ( 38 ; 34a . 38a ) has a thickness of between 100 and 500 μm. Composite film according to one of claims 1 to 15, characterized in that the first layer ( 12 ; 12a ; 12b ) has a thickness of between 20 and 250 μm. Composite foil according to one of Claims 1 to 16, characterized in that the second layer ( 14 ; 14a ; 14b ) has a thickness between 20 to 450 microns. Composite foil according to one of claims 2 to 17, characterized in that the coextruded adhesive layer ( 18 ; 18a ; 18b ) or the coextruded adhesive layer region ( 22 ; 22a ; 22b ) has a thickness between 2 to 100 microns. Container, in particular tube, with one of a foil blank ( 54a ) of a composite film ( 10a ) according to any one of claims 1 to 18, wherein the two second layer regions ( 20a ) in the seam area ( 56a ) of the container ( 52a ) are arranged. Method for producing a container blank, in particular a tube blank made of a composite film, according to one of claims 1 to 18, characterized in that a first layer ( 12 ; 12a ; 12b ) of sealable material simultaneously with a first layer ( 12 ; 12a ; 12b ) covering the second layer ( 14 ; 14a ; 14b ) with a plurality of first layer regions (side by side) provided next to the extrusion direction ( 18 ; 18a ; 18b ) and transversely to the extrusion direction on both sides of each of the first layer regions ( 18 ; 18a ; 18b ) subsequent second layer regions ( 20 ; 20a ; 20b ) from one of the material of the first layer region ( 18 ; 18a ; 18b ) various sealable material is coextruded; that at least the first layer area ( 18 ; 18a ; 18b ) with a decorative print ( 24 ; 24a ; 24b ) is printed; that a foil blank ( 54a ), which has a first layer region ( 18a ) and on both sides of the first layer area ( 18a ) subsequent second layer areas ( 20a ), wherein the production of a foil blank ( 54a ) for the container blank ( 52a ) such that the section is approximately along the middle of each second layer region (FIG. 20a ) runs; that the foil blank ( 54a ) is rolled up in a tubular manner so that the edges of the two second layer regions ( 20a ) are associated with each other; and that the mutually associated edges of the film blank ( 54a ) are sealed overlapping or butting together. Method for producing a container blank, in particular a tube blank, according to claim 12, characterized in that, simultaneously with the coextrusion of the first layer ( 12 ; 12a ; 12b ) and the second layer ( 14 ; 14a ; 14b ) an adhesive layer ( 16 ; 16a ) for connecting the first layer ( 12 ; 12a ; 12b ) and the second layer ( 14 ; 14a ; 14b ) is coextruded. Method for producing a container blank, in particular a tube blank, according to claim 20 or 21, characterized in that, simultaneously with the coextrusion of the first layer region ( 18 ; 18a ; 18b ) and the second layer area ( 20 ; 20a ; 20b ) an adhesive layer region ( 22 ; 22a ; 22b ) for connecting the first layer region ( 18 ; 18a ; 18b ) and the second layer area ( 20 ; 20a ; 20b ) is coextruded. Method for producing a container blank, in particular a tube blank, according to one of claims 20 to 22, characterized in that simultaneously with the coextrusion of the second layer ( 14 ; 14a ; 14b ) at least one marker region ( 32 ; 32a ; 32b ) is coextruded. Method for producing a container blank, in particular a tube blank, according to one of claims 20 or 23, characterized in that the first sealable layer ( 12 ; 12a ; 12b ) with a decorative print ( 30 ; 30a ; 30b ) is printed. Method for producing a container blank, in particular a tube blank, according to one of claims 20 to 24, characterized in that after the printing of the first layer region ( 18 ; 18a ) a third, at least on its side facing away from the extrusion composite from siegelfä existing layer ( 38 ; 34a . 38a ) by means of a laminating layer ( 36 ; 36a ) against those of the first layer ( 12a ) facing away from the second layer ( 14a ) and / or the second layer ( 14 ; 14a ) facing away from the first layer ( 12 ; 12a ) is laminated. Method for producing a container blank, in particular a tube blank, according to claim 25, characterized in that third sealable layer ( 34a ) before or after the lamination at least on one of its two surfaces with a decorative print ( 44a ) is printed. Method for producing a container blank, in particular a tube blank, according to claims 24 to 26, characterized in that the third sealable layer ( 38 ; 34a . 38a ) in-line in a decoration print ( 24 ; 24a . 44a ) printing press against the first layer ( 12 ; 12a ) or second layer ( 14 ; 14a ) is laminated. Method for producing a container blank, in particular a tube blank, according to one of claims 20 to 27, characterized in that the mutually associated edges of the foil blank ( 54a ) are butt-sealed by sealing techniques such as heat sealing, induction welding or high frequency welding.