DE3914328C2 - With at least one co-extruded and non-oriented plastic film or plastic film web, cardboard blank provided on both sides, enclosed or coated - Google Patents

Description

The present invention relates to one with at least one coextruded and not oriented plastic film or plastic film sheet provided on both sides, enclosed or coated cardboard blank and / or plastic welded or welded onto it Foil bag, preferably for files, ring binders and other organizational and office objects may be means, wherein the plastic film or plastic film sheet is a polyolefin, preferably Polyethylene, and optionally with the cardboard blank over a hot melt layer or adhesive layer is connected, and a method for producing the same ben. The plastic film or the plastic film web consists of at least three layered composite film or composite film web of certain composition, the one has improved weldability.

DE 29 34 850 A1 is already a composite film consisting of at least one Carrier layer and a high-frequency weldable top layer made of a copolymer known from 70 to 90 mol% of ethylene units and 10 to 30 mol% of vinyl acetate units, a layer of polyolefin, polyester or polyamide being used as the carrier layer can be. Unfortunately, the layers used are peelable, so that a Dela Mining of the layers occurs easily. The side edges of the composite film can therefore also according to the corresponding embodiment in the patent application only by hot sealing are permanently welded. Only the bag opening is high frequency welds with the aim of obtaining a peelable closure of the bag opening. Derar Composite foils are suitable for peelable, sealed bag packs, they are each but not suitable to permanently hold the edges of the film together in a high-frequency process weld. Furthermore, there are disadvantages of these composite films when coating processing of cardboard blanks.  

From DE 33 24 830 A1 is already a Pap provided with a polyolefin coating pe, preferably for files, ring binders and other organizational and office supplies known that on at least one surface with two superimposed thin Layers of an olefin resin material is provided. The polyolefin coating consists of an at least two-layer polyolefin combination film, which at least at least one side of the cardboard is applied or one side of the cardboard is completely covered with at least one strip or frame-shaped overlap of the cardboard on the surrounding the other side. The polyolefin combination film consists of a hot melt adhesive film as a bottom film, consisting of an olefin homo-, copolymer or olefin homo- or copolymer mixture, the total (based on the total plastic mixture for the Hotmelt adhesive film) 33 to 5% by weight, preferably 30 to 7% by weight, of a polar mono mer or polar monomer mixture in the form of the solid or liquid monomers or contains copolymerized compound (s) with a melting point or melting range from 50 to 95 ° C, preferably 60 to 90 ° C, and a density greater than the density the top film and a melt index 190 / 2.16 less than 10 g / 10 min. It contains further hin a surface film consisting of an olefin homo-, olefin copolymer, a olefin copolymer having polar groups or an olefin homo- or olefin co polymer mixture which has a melting point or melting range of greater than 100 ° C., preferably greater than 105 ° C, has a melt index 190 / 2.16 less than 10 g / 10 min, a hardness of less than 65 Shore D, preferably less than 50 Shore D, and has a density of 0.89 to 0.93 g / cm³, preferably 0.90 to 0.926 g / cm³. The cardboard is directly with the hot melt adhesive film without the use of an adhesive layer or melt adhesive layer. This film is very good for folders, ring binders and other organizational and office supplies suitable, but among other things the Disadvantage that high-frequency separation seam welding of the polyolefin film is not possible Lich and is therefore a wrapping of the film to form a strip or frame overlap of the foils is required.

The aim and object of the present invention was to ver the aforementioned disadvantages avoid and an improved one, with a plastic film or plastic film sheet on both sides  provided, enclosed or coated cardboard blank. The Pap The plastic film surrounding the cut should be flawless, especially at its edges high frequency weldable, not peelable or difficult to peel or delaminate, good processing bar and well suited for cardboard wrappings or coatings, preferably for Ord ner, ring binders and other organizational and office supplies.

According to the invention, it was found that these goals and tasks have at least one a coextruded and non-oriented plastic film or plastic film sheet on both sides provided, enclosed or coated cardboard blank and / or attached to it or welded plastic film bag is sufficient, the plastic film or Plastic sheeting contains a polyolefin, preferably polyethylene, the cardboard blank surrounds and / or optionally with the cardboard blank over a melt adhesive layer or adhesive layer is connected. According to the invention, the plastic film or the plastic film web from an at least three-layer composite film or Ver Bundfolienbahn, of which the top film or top layer and the bottom film or bottom layer of polyethylene, preferably LDPE or LLDPE, and optionally Contains processing aids, additives, filler and / or pigments and the middle film or middle layer of ethylene-vinyl acetate copolymer, ethylene-vinyl acetate coals monoxide terpolymer, polyamide, chlorinated polyethylene, modified ethylene Propylene-diene polymer, ethylene-acrylic acid copolymer or terpolymer, ethylene Acrylic acid ester copolymer or terpolymer, maleic anhydride terpolymer and / or Cellulose acetobutyrate exists or one or more of these polymers in addition to processing processing aids, additives, fillers and / or pigments.

The plastic film web is the cardboard blank or the sheet-like cellulose Provide the edges of the film protruding with a high-frequency seam, the Dic ke of the bottom film or bottom layer (the layer facing the cardboard blank) 2 to 45% the thickness of the middle film or middle layer. The use of the invention coated or enclosed cardboard blank is preferably made for folders, Ring binders and other organizational and office supplies.  

According to a preferred embodiment, the middle film or middle layer consists of Ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide terpolymer Polyamide, chlorinated polyethylene, modified ethylene-propylene-diene polymer, Ethylene-acrylic acid co-polymer or terpolymer and / or ethylene-acrylic acid ester co-polymer or -Terpolymerisat and / or methacrylic acid co- or -Terpolymerisat or ethylene- Methacrylic acid ester copolymer or terpolymer, maleic anhydride copolymer or terpolyme risat and / or cellulose acetobutyrate or contains one or more of these polymers or it also contains processing aids, additives, fillers and / or pig ment. The cardboard blank is polygonal, preferably square, rectangular or square. The plastic sheet is on the cardboard cut up to a maximum of 8 mm projecting film edges, preferably up to a maximum of 4 mm projecting Foil edges, provided with a high-frequency weld, the thickness of the Unterfo lie or underlayer (layer facing the cardboard blank) 2 to 45%, the thickness the middle film or middle layer.

According to a further preferred embodiment, the at least three-layer Composite film, which encloses the cardboard blank, an upper film or top layer, the thickness of which is less than 65%, preferably 2 to 45%, of the thickness of the middle layer wearing. This top layer or top film is made of low density polyethylene (LLDPE or LDPE) or contains this in addition to processing aids, additives, fillers and / or pigments. The at least three-layer plastic film web is after one Embodiment directly or via a melt adhesive layer or adhesive layer with the pap cut or surround it without an adhesive or adhesive connection.

According to a preferred embodiment, the rectangular cardboard blank or the rectangular cardboard by at least two groove-shaped and / or groove-shaped ridges or folds or folds as fold lines or in at least three rectangles shaped cardboard cutting fields for file spine, front and back cover divided and over the entire surface of two identical or different, at least three-layer Ver  bundle foil webs, their bottom layer or bottom foil directly to the cardboard cut or facing over a melt adhesive layer or adhesive layer, wherein the Plastic sheeting over the cardboard blank up to 0.1 to 8 mm, preferably 0.5 to 4 mm, protruding film edges with a high-frequency weld, preferably High-frequency weld seam produced in the separation welding process.

According to a preferred embodiment, at least three are next to each other in a distance of 0.2 to 15 mm, preferably 0.5 to 8 mm, arranged in a rectangular shape cardboard blanks, consisting of a rectangular folder spine cardboard cut and a rectangular front and back cover cardboard blank over the entire surface of two identical or different, at least three-layer composite film webs, the lower layer or lower film of which directly or cut the cardboard blanks is surrounded by a melt adhesive layer or adhesive layer, the art Fabric film web over the outer edges of the cardboard blank 0.1 to 8 mm, preferably 0.5 up to 4 mm, projecting plastic film edges with high-frequency separation welding has seam.

The thickness of the middle film or middle layer is 30 to 500 μm, preferably 40 to 350 µm.

According to a further preferred embodiment, the thickness of the bottom film is or Underlayer and / or the top film or top layer 10 to 225 microns, preferably 15 to 100 µm.

The invention further relates to a method for producing on both sides with at least a cardboard enclosed or coated plastic film cut, preferably for folders, ring binders and other organizational and office use may be means, wherein the plastic film or plastic film sheet is a polyolefin, preferably Contains polyethylene and optionally with the cardboard blank directly or via a Melt adhesive layer or is connected with an adhesive. According to the invention  At least three layers are used as the plastic film or plastic film web term composite film or composite film web is used, in which the upper film or upper layer and the bottom film or bottom layer made of polyethylene, preferably LDPE or LLDPE, exist and optionally processing aids, additives, fillers and / or Contains pigments and the middle film or middle layer made of ethylene vinyl acetate Copolymer, ethylene-vinyl acetate-carbon monoxide terpolymer, polyamide, chlorinated Polyethylene, modified ethylene-propylene-diene polymer, ethylene-acrylic acid co- or terpolymer, ethylene-acrylic acid ester co- or terpolymer and / or meth acrylic acid copolymer or terpolymer or ethylene methacrylic acid ester copolymer or terpoly merisat, maleic anhydride terpolymer and / or cellulose acetobutyrate exists or one or more of these polymers in addition to processing aids, additives, fillers and / or pigments, the thickness of the bottom film or bottom layer 2 to 45% the thickness of the middle film or middle layer is that one of these plastic films, Plastic film webs or corresponding plastic film web cuts of the same or different composition separately to the front and back surface of the cardboard cut fed, applied to the front and back surfaces of the cardboard blank and the plastic films, plastic film webs or plastic film web cuts on the to maximum of 8 mm outside the cardboard blank or the flat substrate edges are welded to each other in the high-frequency separation welding process.

The high-frequency separating seam welding on the protruding from the cardboard cuts Outer walls are made so that welded material-thinned spots or lines arise over which the film waste grating with the plastic article initially still in Ver bond is 3 to 25%, preferably 4 to 20%, of the total thickness of the area plastic films, webs and / or blanks lying opposite one another.

The lower layers or lower foils of the composite film webs are according to the invention According to the process either face the cardboard blanks directly or stand with an adhesive or adhesive layer in connection with these. The top films or upper layer are preferably the outer layers. According to another preferred embodiment  form contain the top foils or top layers, pigments, color pigments and / or filler fabrics or have a print layer on their outer surface, preferably colored print layer and / or an additional surface protective layer.

According to a preferred embodiment of the method according to the invention, min at least three-layer composite film, a composite film or a composite film blank used, which has an upper film or top layer, the thickness of which is less than 65%, preferably 2 to 45%, of the thickness of the middle layer or middle film and the or which consists of low density polyethylene (LLDPE or LDPE) or this in addition Processing aids, additives, fillers and / or pigments and / or these as Main component and polar group-containing polymers containing polar Groups from 0.1 to 9.9% by weight (based on 100 parts by weight of the upper and / or lower film)) contains and the middle film or middle layer of ethylene vinyl acetate Copolymer, ethylene-vinyl acetate-carbon monoxide terpolymer, polyamide, chlorinated Polyethylene, modified ethylene-propylene-diene polymer, ethylene-acrylic acid co- or -Terpolymerisat, ethylene-acrylic acid ester co- or -Terpolymerisat and / or Methacrylic acid co or terpolymer or ethylene methacrylic acid ester co or ter polymer, maleic anhydride terpolymer and / or cellulose acetate butyrate or contains one or more of these polymers or in addition to processing aids, Contains additives, fillers and / or pigments. The composite film webs or Ver Bundle film sheet blanks become the front and back surfaces of the cardboard blanks fed, which are polygonal, preferably square, rectangular or square, applied to the front and back surfaces of the cardboard blanks. Below are the plastic film sheets or plastic film sheet blanks to the Pap cut to a maximum of 8 mm, preferably up to a maximum of 4 mm vertical film edges with a high-frequency weld, preferably on the protruding outer edges using the high-frequency welding process welded.  

According to a preferred embodiment of the method according to the invention, the rectangular cardboard blanks, consisting of a rectangular file spine cardboard blank, a rectangular front and a back cover cardboard cut, side by side at a distance of 0.2 to 15 mm, preferably 0.5 to 8 mm, arranged and over the entire surface of two identical or different, at least three layered composite film sheets surround on their front and back surfaces, the bottom layer or bottom film directly surround the cardboard blanks or their bottom layer or bottom film with the cardboard blanks directly or via a melt adhesive layer or adhesive layer are sealed or glued, the plastic film webs over the outer edges of the cardboard blank protrude and at a distance from the outside edge of the cardboard blank of 0.1 to 8 mm, preferably 0.5 to 4 mm, with each other high frequency seams are welded.

In each case at least three next to each other at a distance of 0.2 to 15 mm, preferably 0.5 to 8 mm, arranged rectangular cardboard blanks, consisting of a right corner-shaped folder spine cardboard cut and one rectangular front and back cover cardboard blank, are thus the whole of two identical or surrounded by different, at least three-layer composite film webs, their sub layer or bottom film immediately surrounds the cardboard blanks or their bottom layer or bottom film with the cardboard blanks directly or via a melt adhesive layer or adhesive layer is sealed or glued, at the same time, preferably subsequently, the plastic film overhanging the outer edges of the cardboard blank NEN or plastic film sheets at a distance from the edge of the cardboard cut tes from 0.1 to 8 mm, preferably 0.5 to 4 mm, high frequency welded seam and the between the spaced rectangular cardboard blanks Fo Railroad parts, foil web fields or foil web lines by at least one high frequency welded or high-frequency decorative seam including cardboard blanks.

According to a further preferred embodiment, composite film webs or Ver bundle film sheet blanks used, the middle film thickness or middle layer thickness 30 to  500 microns, preferably 40 to 350 microns, while the thickness of the bottom film or Un top layer and / or top film or top layer 10 to 225 microns, preferably 15 to 100 µm. The plastic composite film webs or plastic film cuts are as already stated, on the front and back surfaces of three side by side in a spaced cardboard blanks consisting of front sides Cover, folder back and back cover applied and at a distance from the Cardboard blank outer edge welded in the high-frequency separating weld process so that the seams welded, thinned material or lines over the foil grid are still connected to the cardboard cuts enclosed by film webs, the thinned places, lines and the like according to a preferred Aus form less than 15%, preferably less than 10%, of the total have thickness of the (two) plastic film webs or plastic film blanks. The the High-frequency welded protruding foil grids are subsequently cut off where at the same time, before or after that arranged between the cardboard blanks Film web parts, film web fields or film web lines using the high-frequency welding process are welded together.

According to a preferred embodiment of the method according to the invention Plastic composite film webs or plastic film blanks of the films mentioned together seating and produced on the front and back surface of three side by side cardboard blanks arranged at a distance from each other, consisting of front egg lid, file spine and back cover, applied. The plastic sheeting or the plastic film sheet blanks are subsequently separated from the pap outer edges (protruding) of 0.1 to 8 mm, preferably 0.5 to 4 mm, with provided and welded a high-frequency separating weld so that the separating seam welding, material-thinned spots or lines over the foil grid with the of the Cardboard blank wrapped in film webs are still connected, with the mate rial thinned places, lines and the like a thickness less than 25%, preferably less than 15%, and particularly preferably less than 10%, of the total thickness of the Have (both) plastic films or plastic film sheet blanks. Between  The two film webs or film web blanks were cut together with cardboard welded. The foil grids protruding from the high-frequency weld seam, Fo Leftovers and the like are subsequently separated.

According to a further preferred embodiment, contains at least one layer or Film at least one inorganic or organic filler or a filler mixture in amounts by weight from 0 to 50% by weight (advantageously 0.3 to 50% by weight), preferably 1 to 40 wt .-%) based on 100 parts by weight of the contained in the respective film layer ten polymers, or based on the film layer itself. As inorganic fillers calcium carbonate, talc, silicon dioxide, clays, magnesium oxide and the like used in finely divided form. The inorganic fillers or Füllstoffgemi are in an average particle size below 10 microns, preferably with an average Particle size below 1 micron used.

Preferred inorganic-chemical fillers or filler mixtures are starch and Cellulose, especially cellulose fibers, used. The individual plastic layers ent optionally also hold processing aids, modifiers, pigments, Dyes and / or flame retardants.

According to a further preferred embodiment, at least one layer or Fo lienschicht a blowing agent or blowing agent mixture in weight amounts of 0.1 to 6.5 % By weight, preferably 0.3 to 5.5% by weight, based on the respective layer or Polymer content or polymer and filler content of the respective layer supplied. The Blowing agent is preferred before processing or thermoforming the plastic Mix added to the plastic film or plastic sheet, so that at the respective Layer or film, preferably achieved a certain degree of foaming in coextrusion and a decrease in density of 1 to 30%, preferably 5 to 25%, is achieved.

According to a further preferred embodiment, the top layer or top film and / or the lower layer or lower film or the entire composite film is structured or  embossed. This additional process gives the composite films an attractive appearance web, furthermore a reduction in the contact area in the roll or in the stack and thus less blocking.

According to a further embodiment, at least one film layer is peroxidized cal or EHS crosslinking agents in weight amounts of 0.05 to 4 wt .-%, preferably as 0.1 to 3 wt .-%, used. These agents increase the heat level Strength without significantly influencing the hardness of the film layer.

According to a further preferred embodiment, the plastic film or Plastic film web made of an at least three-layer composite film or films web, of which the upper film or upper layer and the lower film or lower layer of Po polyethylene, preferably LDPE or LLDPE, or this is in addition to processing aids, Contains additives, fillers and / or pigments and / or as the main component in 90.5 wt .-% to 99.5 wt .-% and polar group-containing polymers with a Ge holds on the polar group-containing polymers from 0.5 to 9.5 wt .-% (based on 100 parts by weight of the top and / or bottom film) contains.

Examples

In accordance with the method according to the invention, plastic composite film webs were or plastic film blanks of the film compositions mentioned in the examples manufactured and on the front and back surface of three side by side in one Cardboard blanks spaced 3.5 mm apart, consisting of front side cover, folder spine and back cover, applied. The plastic film web or the plastic sheet blanks were spaced from the cardboard blank Provide the outer edge (protruding) of 2 mm with a high-frequency separating weld and welded that the seam-welded, thinned places or lines over the foil grid with the cardboard blank enclosed by the foil sheets are connected, the thinned places, lines and the like one Thickness less than 15%, preferably less than 10%, of the total thickness of the (two) Have plastic films. Between the cardboard blanks were the two film bah welded to one (using high-frequency welding). The the high frequency separator Foil grids protruding from the weld seam were subsequently cut off.

example 1

It became a 280 µm thick, three-layer coextruded, non-oriented Laminated film produced and used, consisting of a 200 µm thick Middle layer made of polyamide and a 30 µm thick polyethylene layer (LDPE) as a cover layer on both sides (i.e. top and bottom layers). The top and the lower layer thus had the same composition.

Two of the three-layer film webs or film web blanks were after applying the same on or under the cardboard blanks other high frequency welded. Flawless high-frequency Achieve separating welds with industrially acceptable cycle times.  

Example 2

A three-layer film consisting of a 260 µm thick ethylene Vinyl acetate copolymer layer (with a vinyl acetate content of 28 Wt .-%) and with two outer layers of polyethylene (LDPE) with one Layer thicknesses of 40 µm each were coextruded. The composites thus obtained were according to the above description after addition to Pap cut and the like high-frequency welded together. It ent there were inseparable welds), especially between the inner layers (sub-layers) of polyethylene (LDPE), and let it flawless high-frequency separating weld seams are achieved.

Example 3

There was a coextruded, non-oriented plastic film consisting of a middle layer made of ethylene-vinyl acetate copolymer (with 28% by weight Vinyl acetate content), the two outer layers (upper and lower layer) in a layer thickness of 40 µm made of filler-containing polyethylene contained. The filler of the outer layers (top and bottom layers) was 10 % By weight. They contained finely divided fillers (chalk) in the form of a Batches were added during manufacture. The foils were then ß, as described above, high frequency welded. The film showed one dry grip. The inside could be welded well achieve the LDPE layers (sub-layers) with one another as well as good ones Make high-frequency separating welds.  

Drawing description

In the accompanying drawing is a preferred embodiment of the invention coated or surrounded by the plastic film cardboard blank schematically shown.

The three cardboard blanks ( 1 ), consisting of the front cover, file spine (smaller area) and back cover, are surrounded by the three-layer composite film. The middle layer or middle film ( 3 ) has the greatest layer thickness. Above or below the middle layer or middle film, the top layer ( 8 ) or top film is shown schematically, which has a smaller layer thickness than the middle layer or middle film (cannot be seen from the schematic drawing) and which at the same time preferably represents the outer layer. According to one embodiment, the top layer is also provided with a print and / or lacquer layer and can also be embossed or structured. The sub-film or sub-layer ( 2 ) directly surrounds the cardboard blank (as well as the top and bottom surface of the cardboard blank) or, according to one embodiment, is glued or sealed to the cardboard blank. At the protruding outer edges, the composite films are provided with a separating weld seam ( 4 ), which represents a high-frequency separating weld seam. Between the cardboard blanks, the plastic composite films are welded or connected to one another at their lower layers or lower films by a sealing seam ( 5 ) or decorative seam, which is produced by the high-frequency welding process.

In the schematic section arranged next to the schematic representation, it is shown that the separating weld seam ( 6 ), produced in the high-frequency welding process, can also be arranged on or near the underside of the film or the underside of the cardboard cutout and need not be in the middle of the film. Likewise, the sealing seam ( 7 ) can be arranged in the plane of the bottom film.

In Fig. 2, a seam-welded folder with cardboard insert and welded bag is shown schematically. The cardboard insert is surrounded by the three-layer film, consisting of top layer or top film, middle layer or middle film and bottom layer or bottom film, the bottom layers or bottom films facing the cardboard insert directly or via an intermediate layer or adhesive layer or being connected to it. On one side of the three-layer film, a pocket is welded onto the top layer or top film, which preferably has three layers and is preferably welded or welded to the top film of the three-layer films surrounding the cardboard blank with the bottom layer or bottom film.

Claims (12)

1. With at least one co-extruded and non-oriented plastic film or plastic film web provided on both sides, enclosed or coated cardboard cut and / or plastic film bag welded or welded onto this, preferably for folders, ring binders and other organizational and office supplies, where the plastic film or Plastic sheeting contains a polyolefin, preferably poly ethylene, and is optionally connected to the cardboard blank by means of a hotmelt adhesive layer or adhesive layer, characterized in that the plastic sheeting or plastic sheeting consists of an at least three-layer composite film or composite film web, of which the top film or top layer and the lower film or lower layer consists of polyethylene, preferably LDPE or LLDPE, and optionally contains processing aids, additives, filler and / or pigments and the middle film or middle layer consists of ethylene-vinyl acetate copol ymerisat, ethylene-vinyl acetate-carbon monoxide terpolymer, polyamide, chlorinated polyethylene, modified ethylene-propylene-diene polymer, ethylene-acrylic acid copolymer or terpolymer, ethylene-acrylic acid ester copolymer or terpolymer, maleic anhydride terpolymer and / or cellulose acetate exists contains one or more of these polymers in addition to processing aids additives, fillers and / or pigments and the plastic film web is provided with a high frequency separating weld seam at the edges of the film which protrude up to a maximum of 8 mm, the thickness of the lower film or lower layer (facing the cardboard cut Layer) is 2 to 45% of the thickness of the middle film or middle layer. 2. Cardboard blank enclosed by plastic film webs according to claim 1, there characterized in that the at least three-layer composite film is an upper film or top layer whose thickness is 2 to 45% of the thickness of the middle layer or Middle film is.   3. Cardboard blank enclosed by plastic sheeting according to claims 1 and 2, characterized in that the at least three-layer plastic film web directly or via a melt adhesive layer or adhesive layer with the cardboard blank in Connection is established or surrounds it without an adhesive or adhesive connection. 4. Cardboard blank enclosed by plastic film webs according to one or more of claims 1 to 3, characterized in that the rectangular cardboard cut or the rectangular cardboard by at least two groove-shaped and / or groove-shaped elevations and / or depressions or folds as fold lines or in at least three Rectangular cardboard cutting fields for file spine, front and back cover divided and surrounded over the entire area by two identical or different, at least three-layer composite film webs, the bottom or bottom film of which faces the cardboard blank directly or via a melt adhesive layer or adhesive layer, the plastic film webs covering the cardboard blank up to 0 , 1 to 8 mm, preferably
0.5 to 4 mm, have protruding film edges with a high-frequency separating weld. 5. Cardboard blank enclosed by plastic sheeting according to one or more of claims 1 to 4, characterized in that in each case at least three ne next to one another at a distance of 0.2 to 15 mm, preferably
0.5 to 8 mm, arranged, rectangular cardboard blanks consisting of a rectangular folder back cardboard blank and a rectangular front and back cover cardboard blank all over the entire area are surrounded by two identical or different, at least three-layer composite film webs, the underlayer or bottom film of which directly surround the cardboard blanks or whose bottom layer or bottom film are sealed or glued to the cardboard blanks directly or via a melt adhesive layer or adhesive layer, the plastic film web being preferably 0.1 to 8 mm across the outer edges of the cardboard blank
0.5 to 4 mm, protruding plastic film web edges with a high-frequency separating weld seam and at least one high-frequency weld seam or high-frequency decorative seam is arranged between the rectangular cardboard spacing, which connects the plastic film webs arranged on and under the cardboard cuts. 6. Cardboard blank enclosed by plastic film webs according to one or more of claims 1 to 5, characterized in that the thickness of the middle film or middle layer is 30 to 500 µm, preferably
40 to 350 microns. 7. Cardboard blank enclosed by plastic film webs according to one or more of claims 1 to 6, characterized in that the thickness of the lower film or lower layer is 10 to 225 µm, preferably
15 to 100 microns. 8. Process for the production of on both sides with at least one plastic film or Plastic sheet covered or coated cardboard blanks, preferably for folders, ring binders and other organizational and office supplies) where in the plastic film or plastic film a polyolefin, preferably poly contains ethylene and optionally with the cardboard blank on a melt stick layer or connected with an adhesive, characterized in that as Plastic film or plastic film sheet an at least three-layer composite film or composite film web is used, in which the top film or top layer and the lower film or lower layer made of polyethylene, preferably LDPE or LLDPE, exists and optionally processing aids, additives, fillers and / or Contains pigments and the. Middle film or middle layer made of ethylene vinyl acetate Copolymer, ethylene-vinyl acetate-carbon monoxide terpolymer, polyamide, chlo polyethylene, modified ethylene-propylene-diene polymer, ethylene Acrylic acid copolymer or terpolymer) ethylene acrylic acid ester copolymer or terpolyme risat, maleic anhydride terpolymer and / or cellulose acetobutyrate exists or one or more of these polymers in addition to processing, additives, fillers contains substances and / or pigments, the thickness of the bottom film or bottom layer 2 to 45% of the thickness of the middle film or middle layer is that one each Plastic films, plastic film sheets or corresponding plastic film sheets cuts of the same or different composition separately to the front and Back surface of the cardboard blank applied and the plastic films, plastic film sheets or plastic film sheet cuts on the, the cardboard cut or the flat substrate up to a maximum of 8 mm protruding outer edges in the High-frequency separation welding processes are welded together.   9. The method according to claim 8, characterized in that as at least three layers a composite film or a composite film blank is used, which has a top film or top layer, the thickness of 2 to 45% of The thickness of the middle layer or middle film is lower and that of polyethylene Density (LLDPE or LDPE) exists and, if necessary, processing aids contains substitutes, fillers and / or pigments and their middle film or agents layer of ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide Terpolymer, polyamide, chlorinated polyethylene, modified ethylene-propylene Diene polymer, ethylene-acrylic acid co- or terpolymer, ethylene-acrylic acid ester copolymer or terpolymer, maleic anhydride terpolymer and / or Cellulose acetobutyrate consists or contains one or more of these polymers or in addition to processing aids, additives, fillers and / or pigments contains that the composite film webs or composite film web cuts to the Front and back surfaces of the cardboard blanks fed, the polygonal, preferred as square, rectangular or square, on the front and back surfaces Chen the cardboard blanks applied flat and the plastic sheeting on the the cardboard cut up to a maximum of 4 mm protruding film edges with a High-frequency separation weld seam provided in the high-frequency separation weld process are welded together. 10. The method according to claims 8 and 9, characterized in that the rectangular cardboard blanks consisting of a rectangular folder cardboard cut and each a rectangular front and a back cover cardboard cut, side by side at a distance of 0.2 to 15 mm, preferably
0.5 to 8 mm, arranged and completely surrounded by two identical or different, at least three-layer composite film webs on their front and back surfaces, the lower layer or lower film of which directly surrounds the cardboard blanks or whose lower layer or lower film with the cardboard cuts directly or via a melt adhesive layer or Adhesive layer is sealed or glued, the plastic film webs protruding beyond the outer edges of the cardboard blank and at a distance from the outer edge of the cardboard blank of 0.1 to 8 mm, preferably
0.5 to 4 mm, are welded to each other with high-frequency separating seams. 11. The method according to one or more of claims 8 to 10, characterized in that in each case at least three side by side at a distance of 0.2 to 15 mm, preferably
0.5 to 8 mm, arranged rectangular cardboard blanks, consisting of a rectangular file folder cardboard blank and each a rectangular front and back cover cardboard blank, are surrounded over the entire area by two identical or different, at least three-layer composite film webs, the bottom layer or bottom film of which directly surrounds the cardboard blanks or whose underlayer or underlayer is sealed or glued to the cardboard blanks directly or via a melt adhesive layer or adhesive layer, that the plastic film webs or plastic film web cuts projecting beyond the outer edges of the cardboard blank are at a distance from the edge of the cardboard blank of 0.1 to 8 mm, preferably
0.5 to 4 mm, high-frequency seams are welded and the film web parts, film web panels or film web lines lying between the spaced rectangular cardboard cuts are connected by at least one high-frequency weld seam or high-frequency decorative seam, including the cardboard blanks. 12. The method according to one or more of claims 8 to 11, characterized in that a composite film web or a composite film web blank is used, the middle film thickness or middle layer thickness 30 to 500 microns, preferably
40 to 350 µm, while the thickness of the bottom sheet or bottom layer and / or top sheet or top layer is 10 to 225 µm, preferably
15 to 100 microns, is that the plastic composite film sheets or plastic film blanks on the front and back surface of three next to each other at a distance from each other arranged cardboard blanks, consisting of front cover, folder back and back cover, applied and at a distance from the cardboard cut outer edges in high frequency -Trennschweißnahtverfahren welded who the that the seam-welded, thinned areas or lines are still connected via the film grid with the cardboard cuts enclosed by film webs, the thinned areas, lines and the like having a thickness less than 15%, preferably less than 10% Have total thickness of the (two) plastic film webs or plastic film blanks and the film grating projecting beyond the high-frequency weld seam is subsequently cut off, the cut between the cardboards being made simultaneously, before or after arranged film web parts, film web fields or film web lines are welded together using the high frequency welding process.