EP0286772A2 - Showcase - Google Patents

Abstract

The folder, which is produced from a rigid insert, particularly of cardboard, and has a plastic coating, is characterised in that the plastic is polypropylene and/or polyethylene and is directly applied to the moving paper support (Fig 2) through a wide-aperture nozzle (Fig 1), continuously and in the liquid state (pigmented or unpigmented). The paper support coated with the polypropylene and/or polyethylene plastic is applied to the outside of the insert (Fig 3) and can terminate with open edges on the insert (Fig 4) or be drawn over the edges onto the inside of the insert (Fig 5). Conventionally, the inside is also coated with a paper/PP (or PE) combination. The product is further characterised in that the plastic coating consists of a printed or unprinted sheet of paper which is coated with liquid polypropylene or polyethylene with a variable weight per unit area (for example, 20-60 g per square metre). <IMAGE>

Description

I. Preliminary remark

The Austrian patent No. 338740 is characterized by the following patent claim (in extracts): folder, in particular sample, advertising or offer folder, which is made of a stiff insert made of cover material, especially cardboard, and a plastic cover in the form of a laminated onto a printed sheet Has film, which is drawn onto the outside of the insert and pulled over its edges on all sides to the inside of the insert, characterized in that the plastic cover consists of a printed sheet laminated with a thin polypropylene film and that the cover is a common embossing of polypropylene film and printed sheet, wherein optionally also on the inside of the insert a laminated with a polypropylene film, co-embossed with this and possibly printed sheet is drawn, which covers the edges of the sheet drawn on the outside.

II. Patent application: I. The invention:

The invention relates to a folder, in particular sample, advertising or promotional folder, which is made of a rigid insert, in particular cardboard, and has a plastic coating consisting of polypropylene (PP) or polyethylene (PE), which is printed or unprinted Paper web was applied liquid (plastic) via a slot die. This combination of paper / PP (alternatively PE) is drawn onto the outside of the insert and, if necessary, guided over its edges on all sides to the inside of the insert. Such a paper / PP (alternatively PE) combination is usually also applied to the inside.

2. The state of the art:

• a) It is known for the portfolio to cover a stiff insert on both sides with a polyvinyl chloride film (PVC film) and to weld it at the edges. Such plastic folders are hard-wearing, but have a less appealing appearance. There are only limited options available for embossing or printing the surface. If, on the other hand, such plastic folders are to be provided on the outside with sharply drawn, vivid and bright images, this can only be achieved economically by inserting them into the outside of the plastic folders welded bags made of transparent plastic film and pushes the desired prints into these bags. However, the appearance of such folders is not very dignified, the pockets can easily be damaged. In addition, polyvinyl chloride is considered to be less environmentally friendly, since on the one hand it does not rot, but on the other hand it also releases hydrochloric acid when burned, which is clearly to be regarded as harmful to the environment.
• b) Folders are also known, on the rigid insert of which a sheet is drawn, which consists of a print with a laminated smooth acetate film. Such folders can be provided with colorful prints, but the smooth acetate film leads to annoying reflections and is not very hard-wearing. It is damaged in places after only a short use and thereby loses its originally pleasing appearance.
• c) Finally, folders are known (see Austrian patent certificate No. 338740) in which a polypropylene film is laminated onto a printed sheet. Folders of this type are hard-wearing and environmentally friendly, but very expensive, since the PP film has to be produced in itself and can only be applied to the paper web in a further operation using adhesive.

3. Advantages of the invention, differences to existing solutions, in particular to patent no. 338740:

• a) Die feste Verbindung zwischen dem Zelluloseträger und dem Kunststoffmaterial ergibt sich ohne Hilfs­mittel wie z.B. Klebstoff. Dadurch, daß der Kunst­stoff (PP, PE) aus einem Extruder über eine Breit­schlitzdüse kontinuierlich direkt auf den laufenden Papierträger extrudiert wird, kann - im Vergleich zu Patent Nr. 338740 - ein Arbeitsvorgang, nämlich das Kaschieren der Kunststoff-Folie auf den Zellulose­träger eingespart werden. Es wird in der Folge der bereits mit dem Kunststoff fest verbundene Zellu­loseträger auf das Material der Mappe (Pappe) aufkaschiert.
• b) Das Auftragen des flüssigen Kunststoffes auf das Papier erfolgt mit hoher Laufgeschwindigkeit (etwa 200 m/Min.) bei (stufenlos verstellbaren) unter­schiedlichen Beschichtungsstärken. Dem flüssigen Rohstoffgranulat kann bereits Farbe zugefügt werden. Die Verarbeitung des beschichteten Papiers zu den erwähnten Produkten geht schneller vor sich, es entfallen insbesondere Schweiß- und Abkühlzeiten (wie etwa bei PVC-Beschichtungen).
• c) Auf der fertig bearbeiteten Oberfläche können im Impulswärmeverfahren Fenster, Taschen oder Ecken aufgebracht werden, was bei PVC-Materialien nur mit hohem Zeitaufwand (Schweißzeiten) möglich ist und somit das HF-Schweißverfahren bei einer fertigen Decke mit Karton oder Pappe nicht wirtschaftlich eingesetzt werden kann.
• d) Derzeit werden für Kunststoffordner zumeist wenig umweltfreundliche PVC-Folien eingesetzt, die zwischen S 6,-- bis S 8,-- pro qm kosten. Die vorliegende Erfindung ermöglicht es, eine Voll­flächenversiegelung eines Ordners oder Ringbuchs Mappe, Box, Hefter, etc.) um einen Materialeinsatz von bloß öS 3,-- bis 4,-- herzustellen. Das bedeutet eine Materialersparnis für das Produkt in der Größenordnung von 50 %.
• e) Der direkt (in flüssigem Zustand, also nicht in Form einer Folie aufkaschierte) auf den Papierträger aufgebrachte Kunststoff-PP/PE hat weiters den Vorteil der Umweltverträglichkeit: Insbesondere bei der Verbrennung werden keine giftigen Gase, wie etwa Salzsäure bei der Verbrennung von PVC frei. Dazu kommt, daß das Produkt in extremen Temperaturbe­reichen nicht sensibel reagiert, wodurch sowohl Kältebrüche an Schweiß- und Rückennähten, als auch Falten- und Blasenbildungen der Kunststoffoberfläche vermieden werden können.

The present invention fulfills the requirement to produce an environmentally friendly portfolio in readily variable order sizes of polyethylene or polypropylene, which makes the durability variable and at the same time results in a considerable advantage in terms of pricing (reduction by approx. 50%) compared to patent no. 338740 . In detail:

• a) The firm connection between the cellulose carrier and the plastic material results without aids such as adhesive. The fact that the plastic (PP, PE) is continuously extruded from an extruder via a slot die directly onto the running paper backing can save one work step compared to patent no.338740, namely the lamination of the plastic film onto the cellulose backing . As a result, the cellulose carrier that is already firmly connected to the plastic is laminated onto the material of the folder (cardboard).
• b) The liquid plastic is applied to the paper at a high running speed (about 200 m / min.) with (infinitely adjustable) different coating thicknesses. Color can already be added to the liquid raw material granulate. The processing of the coated paper to the products mentioned is faster, especially welding and cooling times (as with PVC coatings) are eliminated.
• c) Windows, pockets or corners can be applied to the finished surface using the pulsed heat process, which is only possible with PVC materials with a high expenditure of time (welding times) and thus the HF welding process cannot be used economically with a finished blanket with cardboard or cardboard can.
• d) Currently, PVC sheets are used for plastic folders, mostly not environmentally friendly, which cost between S 6, - to S 8, - per square meter. The present invention makes it possible to produce a full-surface sealing of a folder or ring binder (folder, box, stapler, etc.) in order to use a material of merely 3 to 4 euros. This means a material saving of around 50% for the product.
• e) The plastic PP / PE ( directly in the liquid state, i.e. not laminated in the form of a film) applied to the paper backing has the additional advantage of environmental compatibility: Especially when burning, there are no toxic gases, such as hydrochloric acid when burning PVC free. In addition, the product does not react sensitively in extreme temperature ranges, as a result of which cold breaks on welds and back seams, as well as wrinkling and blistering of the plastic surface can be avoided.

Claims (1)

Portfolio, in particular sample, advertising or offer folder for office, advertising and school needs, which is made of a rigid insert, in particular cardboard and has a plastic coating, characterized in that the plastic polypropylene / or polyethylene from an extruder via a Wide slot nozzle (Fig. 1) is continuously applied in a liquid state (colored or uncolored) directly to the running paper carrier (Fig. 2). The paper carrier coated with the plastic polypropylene and / or polyethylene is drawn onto the outside of the insert (Fig. 3), it can end on the insert with open edges (Fig. 4) or can be pulled over the edges to the inside of the insert (Fig. 5). Usually the inside is also provided with a paper / PP (alternatively PE) combination. The product is further characterized in that the plastic cover consists of a printed or unprinted sheet of paper which is coated with liquid polypropylene or polyethylene which is variable in basis weight (e.g. 20 - 60 g per square meter).

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