EP2991911A1 - Paper sack - Google Patents

Paper sack

Info

Publication number
EP2991911A1
EP2991911A1 EP14718510.2A EP14718510A EP2991911A1 EP 2991911 A1 EP2991911 A1 EP 2991911A1 EP 14718510 A EP14718510 A EP 14718510A EP 2991911 A1 EP2991911 A1 EP 2991911A1
Authority
EP
European Patent Office
Prior art keywords
bag
paper
layer
overlap
coated paper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14718510.2A
Other languages
German (de)
French (fr)
Other versions
EP2991911B1 (en
Inventor
Eduard Lisek
Gerhard Schulte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dy Pack Verpackungen Gustav Dyckerhoff GmbH
Original Assignee
Dy Pack Verpackungen Gustav Dyckerhoff GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dy Pack Verpackungen Gustav Dyckerhoff GmbH filed Critical Dy Pack Verpackungen Gustav Dyckerhoff GmbH
Publication of EP2991911A1 publication Critical patent/EP2991911A1/en
Application granted granted Critical
Publication of EP2991911B1 publication Critical patent/EP2991911B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/147—Valve bags, i.e. with valves for filling the filling port being provided in a side wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags

Definitions

  • the invention relates to a paper bag, preferably a valve paper bag, for bulk material such as cement, gypsum, granules, animal feed o. ⁇ ., With a bottom, preferably a cross or block bottom, and with a bottom opposite the top, in which optionally a valve tube is arranged to fill the paper bag.
  • a paper bag preferably a valve paper bag, for bulk material such as cement, gypsum, granules, animal feed o. ⁇ .
  • a bottom preferably a cross or block bottom, and with a bottom opposite the top, in which optionally a valve tube is arranged to fill the paper bag.
  • Such paper sacks are known, for example from EP 1 858 769 B1.
  • the usual sizes are 5 kg, 10 kg or 25 kg. They have one or more paper layers which are formed from paper or a paper composite and / or coated paper.
  • a valve tube is optionally provided, which is incorporated in the upper part and is plugged for filling on a filler neck.
  • Essential for a quick and economical filling is a rapid escape of the air during the filling process.
  • the bag should be as tight as possible after filling.
  • a barrier layer between an inner layer and an outer layer of paper be inserted.
  • Such sensitive products are, for example, fast-binding products in the field of building materials or food, in which a loss of flavor must be prevented.
  • the paper sacks according to the invention have a coated paper layer with a facing inside the bag coating, which is gas-tight, so forms a good seal against gas passage, in particular against the passage of air oxygen, CO2 or gaseous water. Furthermore, the coated paper layer has an overlap, wherein the overlapping edges preferably run parallel to the side edges of the paper bag, so that the overlap Pung extending in the manner of an overlap strip from the bottom to the top.
  • the overlap of the coated paper layer to the interior of the bag is sealingly bonded, ie in the region of the overlap, the inner layer facing the interior of the bag is glued to the layer of the coated paper layer facing the outside of the bag, and the bond is in the edge region of the overlap Sack interior out.
  • the bonding directly on the edge of the overlap is advantageous, but the bond must not be located directly on the edge of the overlap to the bag interior. Rather, it may be moved away from the edge of the overlap, because even in this case, the intended purpose according to the invention can still be achieved.
  • the layer of the coated paper layer facing the interior of the bag has perforations in the region of the overlap, which are covered by the overlapping position facing the exterior of the bag. Through these perforations air can escape during filling of the bag and escape to the outside of the overlap, since the obstructive for the air flow bonding is arranged to the bag interior.
  • the bonding to the interior of the bag thus has a steering effect for the air flow, as well as a stabilizing effect for the coated paper layer in the region of the overlap, thus serving to hold the material ends together in the region of the overlap. It can thereby be achieved that the air exiting through the perforations during filling exits completely outwards from the region of overlap.
  • the stability in the overlap area is improved and the tightness in the filled state. Furthermore, the leakage of filling material can be avoided by the overlap. By a suitable choice of the sizes of the perforation openings can be ensured that the respective contents are retained in the bag, while the air escapes through the perforations. When the bag is completely filled, the perforations in the region of the overlap are covered by the outer layer of the inner layer, so that the penetration of substances from the outside is avoided.
  • the inventive design a good ventilation during filling is achieved with a high product protection and prolonged product stability of the medium.
  • the gas-tight coating avoids the risk of air erstoff, CO2 or gaseous water in relevant quantities from the outside penetrate and damage or destroy the contents. These gases are primarily responsible for damage to sensitive products or for the lower storage stability of such products. Since the gas-tight coating forms the surface of the bag wall which is in contact with the filling material, there is no paper layer in contact with the filling material, from which residual moisture could diffuse into the filling material.
  • a wider overlap area allows a larger area of perforations in the overlap area and thus better venting when filling.
  • a disadvantage of a larger overlap area is the higher material costs for the inner layer.
  • the overlap of the inner layer is at least 3% of the bag circumference, more advantageously at least 10% of the bag circumference and even more advantageously at least 17% but at most 25% of the bag circumference
  • the gas-tight coating has a multilayer structure.
  • the coating preferably comprises a metallized film and / or a metal foil.
  • a particularly good gas tightness can be achieved.
  • Very suitable as a metallic material is aluminum.
  • the metallic gas barrier ensures particularly good aroma protection in the food industry.
  • the gas-tight coating also forms a barrier to liquids, so that a seal against the ingress of water is achieved.
  • the perforations are formed on the inside or in the inner layer of the overlap by needling and / or one or more slits.
  • the perforations are formed as microperforations, which can be produced for example by electrical or chemical means and are known from cigarette paper.
  • additional adhesions are additionally present in a central region and / or in the edge region of the overlap to the exterior of the bag. These bonds further stabilize the overlap area. These bonds are permeable to the exterior of the bag formed, advantageously by interrupted lines of glue along the edge of the overlap to the bag exterior.
  • the paper bag has a plurality of overlaps according to the invention, particularly preferably an overlap according to the invention on the front side of the bag and a further overlap according to the invention on the back of the bag.
  • the ventilation of the bag can be improved during filling and distributed to both sides.
  • the paper bag according to the invention has, outside the coated paper layer, further paper layers or layers of other materials suitable for bag production. These layers must also be designed so that they allow the air to escape to the outside during filling.
  • Suitable materials for bag making are preferably paper, coated paper, film and / or coated film.
  • FIG. 1 shows a schematic plan view of a valve bag according to the invention with bottom and top
  • FIG. 2a shows a schematic cross section through the bag according to the invention according to FIG. 1, along the line A-A from FIG. 1
  • FIG. 2b the inner coated paper layers 20 of the bag according to FIG.
  • FIG. 3 shows a tube section from the coated paper layer 20 of a bag according to the invention
  • Fig. 4 a tube portion of the coated paper layer 20 of a
  • Valve bag according to a first embodiment of the invention
  • Fig. 5 a hose portion of the coated paper layer 20 of a
  • Valve bag according to a second embodiment of the invention.
  • FIG. 1 shows a paper bag 10 according to the invention with a cross bottom 12 and an upper part 14, the bottom 12 and the upper part 14 being folded onto the front side 16 of the paper bag 10. Not recognizable is the back of the bag, which is below the front 16.
  • a valve tube 15 is inserted in the upper part 14.
  • This paper bag is made of an inner coated paper layer 20 and an outer layer 18 of paper or a paper composite.
  • the overlap 19 of the outer layer is kept narrow and glued, so that the outer layer between the bottom 12 and upper part 14 forms a tube section.
  • the overlap 22 of the inner layer of coated paper 20 is wider and glued to the gluing 24 to the bag interior.
  • the coated paper ply 20 also forms a tube section between the bottom 12 and top 14 where the overlap 22 extends as a strip from the bottom 12 to the top 14.
  • FIG. 2b shows the inner coated paper layer 20 with an enlarged section of the overlap 22.
  • the layer 34 of the coated paper layer 20 facing the interior of the bag overlaps with the layer The outer layer 36 of the coated paper layer 20.
  • the overlap 22 is glued sealingly by means of the adhesive bond 24.
  • FIG. 2c shows the layer structure of the inner coated paper layer 20.
  • the coated paper layer 20 On its outer side, the coated paper layer 20 has a carrier layer 41 made of paper. Inwardly, the next layer is followed by a metallization 42, which is preferably formed from aluminum.
  • the metallization 42 is protected by a plastic coating which consists in its core 43 of PET (polyethylene terephthalate) or comparable plastics.
  • the core 43 is provided on both sides with a surface layer or surface treatment 44. Between the metallization 42 and surface treatment 44 is a lacquer layer 45.
  • a corona pretreatment 46 On the outer surface treatment 44 is a corona pretreatment 46, which then forms the innermost layer towards the interior of the bag.
  • the plastic coating applied to the metallic gas barrier protects the metal layer against damage during the manufacture of the bag.
  • FIG. 3 shows a schematic top view of the tube section of the coated paper layer 20.
  • the overlap 22 of the paper layer 20 is limited to the interior of the bag by the inside edge 26 and to the outside of the bag by the outside edge 28.
  • FIG. 4 shows the configuration of the overlapping region 22 of the paper layer 20 according to a first exemplary embodiment of the invention.
  • the overlapping region is glued sealingly to the interior of the bag with a continuous glue line 24.
  • the outer edge 28 of the overlap is loose, that is not glued.
  • the layer 34 of the paper layer 20 facing the interior of the bag is perforated.
  • the perforation 38 which is shown in Figure 4 with a cross, runs in the same way as the overlap as a strip from the bottom 12 to the top 14.
  • the width B2 of the perforation strip is about half the width B1 of the overlap strip 20.
  • the turned to the outside of the bag Layer 36 of the paper layer 20 has no perforations in the overlap area. As a result, the perforations 38 are covered.
  • the overlap along the outer edge 28 is glued to a broken glue line 32. As a result, the overlap on the outer edge 28 is stabilized.
  • the paper bag can be well vented during filling, and by the gas-tight coating on the inside of the bag and the overlap of the vent perforations in the filled bag high product protection and prolonged product stability of the filling is achieved.
  • the manufacture of the bag is simplified compared to the prior art EP 1 858 769 B1, since no separate barrier layer has to be inserted between two paper layers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)

Abstract

The invention relates to a paper sack (10) for bulk material, such as cement, granulate, animal feed or similar, having a bottom (12), preferably a cross bottom or block bottom, and having a top part (14) which lies opposite the bottom and in which optionally a valve hose (15) for filling the paper sack is arranged, wherein the paper sack comprises a coated paper layer (20) having a gas-tight coating that faces towards the inside of the sack, wherein the coating forms the surface of the inner wall of the paper sack in contact with the filling material, and wherein the coated paper layer has an overlap (22) that is adhesively secured effecting a seal towards the inside of the sack, and wherein in the region of the overlap the layer of the coated paper layer facing towards the inside of the sack has perforations (38) that are covered by the layer of the coated paper layer facing towards the outside of the sack.

Description

Papiersack  paper bags
Beschreibung description
Die Erfindung betrifft einen Papiersack, vorzugsweise einen Ventilpapiersack, für Schüttgut wie Zement, Gips, Granulat, Tierfutter o. Ä., mit einem Boden, vorzugsweise einem Kreuz- oder Blockboden, und mit einem dem Boden gegenüberliegenden Oberteil, in dem ggf. ein Ventilschlauch zum Befüllen des Papiersacks angeordnet ist. The invention relates to a paper bag, preferably a valve paper bag, for bulk material such as cement, gypsum, granules, animal feed o. Ä., With a bottom, preferably a cross or block bottom, and with a bottom opposite the top, in which optionally a valve tube is arranged to fill the paper bag.
Derartige Papiersäcke sind bekannt, beispielsweise aus der EP 1 858 769 B1. Im Handel verbreitet sind insbesondere die üblichen Größen 5 kg, 10 kg oder 25 kg. Sie weisen eine oder mehrere Papierlagen auf, die aus Papier oder einem Papierverbund und/oder beschichtetem Papier gebildet sind. Such paper sacks are known, for example from EP 1 858 769 B1. In particular, the usual sizes are 5 kg, 10 kg or 25 kg. They have one or more paper layers which are formed from paper or a paper composite and / or coated paper.
Zum Befüllen solcher Säcke ist ggf. ein Ventilschlauch vorgesehen, der in das Oberteil eingearbeitet ist und der zum Befüllen auf einen Füllstutzen aufgesteckt wird. Von wesentlicher Bedeutung für ein schnelles und wirtschaftliches Befüllen ist ein schnelles Entweichen der Luft während des Füllvorgangs. Andererseits soll der Sack nach dem Befüllen möglichst dicht sein. Um einen höheren Produktschutz bzw. eine längere Produktstabilität des Füllgutes zu erreichen, kann - wie in der EP 1 858 769 B1 beschrieben - eine Sperrschicht zwischen einer Innenlage und einer Außenlage aus Papier eingelegt sein. For filling such bags, a valve tube is optionally provided, which is incorporated in the upper part and is plugged for filling on a filler neck. Essential for a quick and economical filling is a rapid escape of the air during the filling process. On the other hand, the bag should be as tight as possible after filling. In order to achieve a higher product protection and a longer product stability of the contents, can - as in the EP 1 858 769 B1 - a barrier layer between an inner layer and an outer layer of paper be inserted.
Es hat sich herausgestellt, dass mit den vorbekannten Säcken bei empfindlichen Füllgütern ein hinreichender Produktschutz nicht gewährleistet werden kann. Derart empfindliche Füllgüter sind beispielsweise schnell bindende Produkte im Bereich der Baustoffe oder Lebensmittel, bei denen ein Aromaverlust verhindert werden muss. It has been found that sufficient protection of the product can not be guaranteed with the previously known sacks for sensitive products. Such sensitive products are, for example, fast-binding products in the field of building materials or food, in which a loss of flavor must be prevented.
Als nachteilig bei vorbekannten Säcken hat sich unter anderem erwiesen, dass die Sperrschicht dort nur lose überlappend eingelegt wurde, womit ein hinreichender Produktschutz nicht möglich war, bzw. die Produktstabilität des Füllgutes nicht ausreichend lang. Außerdem haben sich Sacklösungen als nachteilig herausgestellt, bei denen innerhalb der Sperrschicht eine weitere Papierlage angeordnet ist, weil die im Papier enthaltene Restfeuchte in das Füllgut hineindiffundieren kann und dieses dadurch schneller altern lässt bzw. zerstört. A disadvantage of prior art bags has been found, inter alia, that the barrier layer was inserted there only loosely overlapping, whereby a sufficient product protection was not possible, or the product stability of the filling material is not sufficiently long. In addition, bag solutions have been found to be disadvantageous in which a further paper layer is disposed within the barrier layer, because the residual moisture contained in the paper can diffuse into the medium and this can age faster or destroyed.
Es ist daher Aufgabe der vorliegenden Erfindung, einen verbesserten Papiersack vorzuschlagen, der insbesondere einen erhöhten Produktschutz und/oder eine verlängerte Produktstabilität des Füllgutes gewährleistet, und gleichzeitig eine wirtschaftliche Herstellung und schnelle Entlüftung beim Befüllen erlaubt. It is therefore an object of the present invention to provide an improved paper bag, which ensures in particular an increased product protection and / or prolonged product stability of the filling, while allowing economical production and rapid venting during filling.
Erfindungsgemäß wird die Aufgabe durch einen Papiersack mit den Merkmalen des Schutzanspruchs 1 gelöst. Bevorzugte Ausgestaltungen ergeben sich aus den Unteransprüchen. According to the invention the object is achieved by a paper bag having the features of patent claim 1. Preferred embodiments will be apparent from the dependent claims.
Die erfindungsgemäßen Papiersäcke weisen eine beschichtete Papierlage mit einer zum Sackinneren gewandten Beschichtung auf, welche gasdicht ist, also eine gute Abdichtung gegen Gasdurchtritt bildet, insbesondere gegen den Durchtritt von Luft- Sauerstoff, CO2 oder gasförmigem Wasser. Des Weiteren weist die beschichtete Papierlage eine Überlappung auf, wobei die überlappenden Ränder vorzugsweise parallel zu den Seitenrändern des Papiersacks verlaufen, so dass sich die Überlap- pung nach Art eines Überlappungsstreifens vom Boden zum Oberteil erstreckt. Bei den erfindungsgemäßen Papiersäcken ist die Überlappung der beschichtete Papierlage zum Sackinneren hin dichtend verklebt, d. h. im Bereich der Überlappung ist die zum Sackinneren gewandte Lage der Innenlage mit der zum Sackäußeren gewandten Lage der beschichteten Papierlage verklebt, und die Verklebung befindet sich im Randbereich der Überlappung zum Sackinneren hin. Zwar ist die Verklebung direkt am Rand der Überlappung vorteilhaft, allerdings muss sich die Verklebung nicht direkt an der Kante der Überlappung zum Sackinneren befinden. Vielmehr kann sie auch von der Kante der Überlappung abgerückt sein, denn auch in diesem Fall kann der erfindungsgemäß bezweckte Effekt noch erreicht werden. Weiter erfindungsgemäß weist die zum Sackinneren gewandte Lage der beschichteten Papierlage im Bereich der Überlappung Perforationen auf, die von der zum Sackäußeren gewandten Lage der Überlappung überdeckt werden. Durch diese Perforationen kann beim Befüllen des Sackes Luft austreten und zur Außenseite der Überlappung hin entweichen, da die für den Luftstrom hinderliche Verklebung zum Sackinneren hin angeordnet ist. Die Verklebung zum Sackinneren hat somit eine Lenkungswirkung für den Luftstrom, sowie eine Stabilisierungswirkung für die beschichtete Papierlage im Bereich der Überlappung, dient also dem Zusammenhalten der Materialenden im Bereich der Überlappung. Dadurch kann erreicht werden, dass die beim Befüllen durch die Perforationen austretende Luft aus dem Überlappungsbereich vollständig nach außen austritt. Des Weiteren wird die Stabilität im Überlappungsbereich verbessert und die Dichtigkeit im befüllten Zustand. Des Weiteren kann der Austritt von Füllgut durch die Überlappung vermieden werden. Durch geeignete Wahl der Größen der Perforations-Öffnungen kann sichergestellt werden, dass das jeweilige Füllgut im Sack zurückgehalten wird, während die Luft durch die Perforationen entweicht. Beim fertig befüllten Sack sind die Perforationen im Bereich der Überlappung durch die äußere Lage der Innenlage zugedeckt, so dass das Eindringen von Substanzen von außen vermieden wird. The paper sacks according to the invention have a coated paper layer with a facing inside the bag coating, which is gas-tight, so forms a good seal against gas passage, in particular against the passage of air oxygen, CO2 or gaseous water. Furthermore, the coated paper layer has an overlap, wherein the overlapping edges preferably run parallel to the side edges of the paper bag, so that the overlap Pung extending in the manner of an overlap strip from the bottom to the top. In the case of the paper sacks according to the invention, the overlap of the coated paper layer to the interior of the bag is sealingly bonded, ie in the region of the overlap, the inner layer facing the interior of the bag is glued to the layer of the coated paper layer facing the outside of the bag, and the bond is in the edge region of the overlap Sack interior out. Although the bonding directly on the edge of the overlap is advantageous, but the bond must not be located directly on the edge of the overlap to the bag interior. Rather, it may be moved away from the edge of the overlap, because even in this case, the intended purpose according to the invention can still be achieved. In accordance with the invention, the layer of the coated paper layer facing the interior of the bag has perforations in the region of the overlap, which are covered by the overlapping position facing the exterior of the bag. Through these perforations air can escape during filling of the bag and escape to the outside of the overlap, since the obstructive for the air flow bonding is arranged to the bag interior. The bonding to the interior of the bag thus has a steering effect for the air flow, as well as a stabilizing effect for the coated paper layer in the region of the overlap, thus serving to hold the material ends together in the region of the overlap. It can thereby be achieved that the air exiting through the perforations during filling exits completely outwards from the region of overlap. Furthermore, the stability in the overlap area is improved and the tightness in the filled state. Furthermore, the leakage of filling material can be avoided by the overlap. By a suitable choice of the sizes of the perforation openings can be ensured that the respective contents are retained in the bag, while the air escapes through the perforations. When the bag is completely filled, the perforations in the region of the overlap are covered by the outer layer of the inner layer, so that the penetration of substances from the outside is avoided.
Durch die erfindungsgemäße Ausgestaltung wird eine gute Entlüftung beim Befüllen bei gleichzeitig hohem Produktschutz und verlängerter Produktstabilität des Füllguts erreicht. Durch die gasdichte Beschichtung wird vermieden, dass Luftsau- erstoff, CO2 oder gasförmiges Wasser in relevanten Mengen von außen eindringen und das Füllgut schädigen bzw. zerstören können. Diese Gase sind nämlich in erster Linie für Schäden an empfindlichen Produkten bzw. für die geringere Lagerstabilität derartiger Füllgüter verantwortlich. Da die gasdichte Beschichtung die mit dem Füllgut in Kontakt stehende Oberfläche der Sackwand bildet, befindet sich keine Papierlage in Kontakt mit dem Füllgut, aus der Restfeuchte in das Füllgut hinein diffundieren könnte. The inventive design a good ventilation during filling is achieved with a high product protection and prolonged product stability of the medium. The gas-tight coating avoids the risk of air erstoff, CO2 or gaseous water in relevant quantities from the outside penetrate and damage or destroy the contents. These gases are primarily responsible for damage to sensitive products or for the lower storage stability of such products. Since the gas-tight coating forms the surface of the bag wall which is in contact with the filling material, there is no paper layer in contact with the filling material, from which residual moisture could diffuse into the filling material.
Ein breiter ausgestalteter Überlappungsbereich erlaubt eine größere Fläche von Perforationen im Überlappungsbereich und damit eine bessere Entlüftung bei Befüllen. Nachteilig bei einem größeren Überlappungsbereich ist der höhere Materialaufwand für die Innenlage. In diesem Zielkonflikt hat es sich als vorteilhaft erwiesen, wenn die Überlappung der Innenlage mindestens 3 % des Sackumfangs, weiter vorteilhaft mindestens 10 % des Sackumfangs und noch weiter vorteilhaft mindestens 17 % höchstens aber 25 % des Sackumfangs beträgt A wider overlap area allows a larger area of perforations in the overlap area and thus better venting when filling. A disadvantage of a larger overlap area is the higher material costs for the inner layer. In this conflict of objectives, it has proved to be advantageous if the overlap of the inner layer is at least 3% of the bag circumference, more advantageously at least 10% of the bag circumference and even more advantageously at least 17% but at most 25% of the bag circumference
In einer anderen bevorzugten Ausgestaltung ist die gasdichte Beschichtung mehrschichtig aufgebaut. Bevorzugt umfasst die Beschichtung eine metallisierte Folie und/oder eine Metallfolie. Durch derartige metallisierte Folien bzw. Metallfolien lässt sich eine besonders gute Gasdichtigkeit erreichen. Sehr geeignet als metallisches Material ist Aluminium. Die metallische Gasbarriere sorgt für einen besonders guten Aromaschutz im Lebensmittelbereich. In another preferred embodiment, the gas-tight coating has a multilayer structure. The coating preferably comprises a metallized film and / or a metal foil. By such metallized films or metal foils, a particularly good gas tightness can be achieved. Very suitable as a metallic material is aluminum. The metallic gas barrier ensures particularly good aroma protection in the food industry.
Vorteilhafterweise bildet die gasdichte Beschichtung auch eine Barriere für Flüssigkeiten, so daß auch eine Abdichtung gegen den Eintritt von Wasser erreicht wird. Advantageously, the gas-tight coating also forms a barrier to liquids, so that a seal against the ingress of water is achieved.
In einer anderen bevorzugten Ausgestaltung sind die Perforationen auf der Innenseite bzw. in der Innenlage der Überlappung durch Nadelung und/oder eine oder mehrere Schlitzungen gebildet. In einer anderen Variante sind die Perforationen als Mikroperforationen ausgebildet, die beispielsweise auf elektrischem oder chemischem Wege hergestellt werden können und von Zigarettenpapier bekannt sind. ln einer anderen bevorzugten Ausgestaltung sind zusätzlich in einem mittleren Bereich und/oder im Randbereich der Überlappung zum Sackäußeren zusätzlich Verklebungen vorhanden. Diese Verklebungen stabilisieren den Überlappungsbereich weiter. Diese Verklebungen sind durchlässig zum Sackäußeren ausgebildet, vorteilhafterweise durch unterbrochene Klebelinien entlang der Kante der Überlappung zum Sackäußeren. In another preferred embodiment, the perforations are formed on the inside or in the inner layer of the overlap by needling and / or one or more slits. In another variant, the perforations are formed as microperforations, which can be produced for example by electrical or chemical means and are known from cigarette paper. In another preferred embodiment, additional adhesions are additionally present in a central region and / or in the edge region of the overlap to the exterior of the bag. These bonds further stabilize the overlap area. These bonds are permeable to the exterior of the bag formed, advantageously by interrupted lines of glue along the edge of the overlap to the bag exterior.
In einer weiter bevorzugten Ausgestaltung weist der Papiersack mehrere erfindungsgemäße Überlappungen auf, besonders bevorzugt eine erfindungsgemäße Überlappung auf der Vorderseite des Sackes und eine weitere erfindungsgemäße Überlappung auf der Rückseite des Sackes. So kann die Entlüftung des Sackes beim Befüllen verbessert und auf beide Seiten verteilt werden. In a further preferred embodiment, the paper bag has a plurality of overlaps according to the invention, particularly preferably an overlap according to the invention on the front side of the bag and a further overlap according to the invention on the back of the bag. Thus, the ventilation of the bag can be improved during filling and distributed to both sides.
In anderen bevorzugten Ausgestaltungen weist der erfindungsgemäße Papiersack außerhalb der beschichteten Papierlage weitere Papierlagen oder Lagen aus anderen zur Sackherstellung geeigneten Materialien auf. Auch diese Lagen müssen derart ausgebildet sein, dass sie die Luft beim Befüllen nach außen entweichen lassen. Als zur Sackherstellung geeignete Materialien kommen vorzugsweise Papier, beschichtetes Papier, Folie und/oder beschichtete Folie in Betracht. In other preferred embodiments, the paper bag according to the invention has, outside the coated paper layer, further paper layers or layers of other materials suitable for bag production. These layers must also be designed so that they allow the air to escape to the outside during filling. Suitable materials for bag making are preferably paper, coated paper, film and / or coated film.
Ausführungsbeispiele der Erfindung werden anhand der nachstehenden Figuren näher erläutert. Dabei zeigen: Embodiments of the invention will be explained in more detail with reference to the following figures. Showing:
Fig. 1 : eine schematische Draufsicht auf einen erfindungsgemäßen Ventilsack mit Boden und Oberteil, 1 shows a schematic plan view of a valve bag according to the invention with bottom and top,
Fig. 2a: einen schematischen Querschnitt durch den erfindungsgemäßen Sack gemäß Fig. 1 , entlang der Linie A - A aus Fig. 1 2a shows a schematic cross section through the bag according to the invention according to FIG. 1, along the line A-A from FIG. 1
Fig. 2b: die innenliegende beschichtete Papierlagen 20 des Sackes gemäß Fig. FIG. 2b: the inner coated paper layers 20 of the bag according to FIG.
1 , mit einem vergrößerten Ausschnitt der Überlappung 22 mit der Verklebung 24, Fig. 2c: die innenliegende beschichtete Papierlage 20 mit einem vergrößerten Ausschnitt des Schichtaufbaus, 1, with an enlarged section of the overlap 22 with the bond 24, 2c: the inner coated paper layer 20 with an enlarged section of the layer structure,
Fig. 3: einen Schlauchabschnitt aus der beschichteten Papierlage 20 eines erfindungsgemäßen Sackes, 3 shows a tube section from the coated paper layer 20 of a bag according to the invention,
Fig. 4: einen Schlauchabschnitt aus der beschichteten Papierlage 20 eines Fig. 4: a tube portion of the coated paper layer 20 of a
Ventilsackes nach einem ersten Ausführungsbeispiel der Erfindung, und  Valve bag according to a first embodiment of the invention, and
Fig. 5: einen Schlauchabschnitt aus der beschichteten Papierlage 20 eines Fig. 5: a hose portion of the coated paper layer 20 of a
Ventilsackes nach einem zweiten Ausführungsbeispiel der Erfindung.  Valve bag according to a second embodiment of the invention.
Figur 1 zeigt einen erfindungsgemäßen Papiersack 10 mit einem Kreuzboden 12 und einem Oberteil 14, wobei der Boden 12 und das Oberteil 14 auf die Vorderseite 16 des Papiersacks 10 gefaltet sind. Nicht erkennbar ist dabei die Rückseite des Sackes, die unter der Vorderseite 16 liegt. Im Oberteil 14 ist ein Ventilschlauch 15 eingesetzt. FIG. 1 shows a paper bag 10 according to the invention with a cross bottom 12 and an upper part 14, the bottom 12 and the upper part 14 being folded onto the front side 16 of the paper bag 10. Not recognizable is the back of the bag, which is below the front 16. In the upper part 14, a valve tube 15 is inserted.
Hergestellt ist dieser Papiersack, wie insbesondere der Querschnitt gemäß Fig. 2a zeigt, aus einer innenliegenden beschichteten Papierlage 20 und einer Außenlage 18 aus Papier oder einem Papierverbund. Die Überlappung 19 der Außenlage ist schmal gehalten und verklebt, so dass die Außenlage zwischen Boden 12 und Oberteil 14 einen Schlauchabschnitt bildet. Die Überlappung 22 der innenliegenden beschichteten Papierlage 20 ist breiter ausgebildet und mit der Verklebung 24 zum Sackinneren hin verklebt. Die beschichtete Papierlage 20 bildet zwischen Boden 12 und Oberteil 14 ebenfalls einen Schlauchabschnitt, bei dem sich die Überlappung 22 als Streifen vom Boden 12 zum Oberteil 14 erstreckt. This paper bag, as shown in particular by the cross section according to FIG. 2 a, is made of an inner coated paper layer 20 and an outer layer 18 of paper or a paper composite. The overlap 19 of the outer layer is kept narrow and glued, so that the outer layer between the bottom 12 and upper part 14 forms a tube section. The overlap 22 of the inner layer of coated paper 20 is wider and glued to the gluing 24 to the bag interior. The coated paper ply 20 also forms a tube section between the bottom 12 and top 14 where the overlap 22 extends as a strip from the bottom 12 to the top 14.
Figur 2b zeigt die innenliegende beschichtete Papierlage 20 mit einem vergrößerten Ausschnitt der Überlappung 22. Im Bereich der Überlappung 22 überlappt die zum Sackinneren gewandte Lage 34 der beschichteten Papierlage 20 mit der nach außen gewandten Lage 36 der beschichteten Papierlage 20. An ihrem zum Sackinneren gewandten Rand ist die Überlappung 22 mittels der Verklebung 24 dichtend verklebt. FIG. 2b shows the inner coated paper layer 20 with an enlarged section of the overlap 22. In the region of the overlap 22, the layer 34 of the coated paper layer 20 facing the interior of the bag overlaps with the layer The outer layer 36 of the coated paper layer 20. At its edge facing the interior of the bag, the overlap 22 is glued sealingly by means of the adhesive bond 24.
Figur 2c zeigt den Schichtaufbau der innenliegenden beschichteten Papierlage 20. An ihrer Außenseite weist die beschichtete Papierlage 20 eine Trägerschicht 41 aus Papier auf. Nach innen folgt als nächste Schicht eine Metallisierung 42, die vorzugsweise aus Aluminium gebildet ist. Die Metallisierung 42 wird durch eine Kunststoffbeschichtung geschützt, die in ihrem Kern 43 aus PET (Polyethylen- terephthalat) oder vergleichbaren Kunststoffen besteht. Der Kern 43 ist beidseitig mit einer Oberflächenschicht bzw. Oberflächenbehandlung 44 versehen. Zwischen Metallisierung 42 und Oberflächenbehandlung 44 befindet sich eine Lackschicht 45. Auf der äußeren Oberflächenbehandlung 44 ist eine Korona-Vorbehandlung 46, die dann die innerste Schicht zum Sackinnern hin bildet. Die auf der metallischen Gasbarriere aufgebrachte Kunststoffbeschichtung schützt die Metallschicht bei der Sackherstellung vor Beschädigungen. FIG. 2c shows the layer structure of the inner coated paper layer 20. On its outer side, the coated paper layer 20 has a carrier layer 41 made of paper. Inwardly, the next layer is followed by a metallization 42, which is preferably formed from aluminum. The metallization 42 is protected by a plastic coating which consists in its core 43 of PET (polyethylene terephthalate) or comparable plastics. The core 43 is provided on both sides with a surface layer or surface treatment 44. Between the metallization 42 and surface treatment 44 is a lacquer layer 45. On the outer surface treatment 44 is a corona pretreatment 46, which then forms the innermost layer towards the interior of the bag. The plastic coating applied to the metallic gas barrier protects the metal layer against damage during the manufacture of the bag.
Figur 3 zeigt eine schematische Draufsicht auf den Schlauchabschnitt der beschichteten Papierlage 20. Die Überlappung 22 der Papierlage 20 wird zum Sackinneren hin begrenzt durch die Innenkante 26 und zum Sackäußeren durch die Außenkante 28. FIG. 3 shows a schematic top view of the tube section of the coated paper layer 20. The overlap 22 of the paper layer 20 is limited to the interior of the bag by the inside edge 26 and to the outside of the bag by the outside edge 28.
Figur 4 zeigt die Ausgestaltung des Überlappungsbereichs 22 der Papierlage 20 nach einem ersten Ausführungsbeispiel der Erfindung. Neben der Innenkante 26 der Überlappung ist der Überlappungsbereich mit einer durchgehenden Klebelinie 24 zum Sackinneren hin dichtend verklebt. Zum Sackäußeren hin ist die Außenkante 28 der Überlappung lose, d. h. nicht verklebt. Im Bereich der Überlappung 22 ist die zum Sackinneren gewandte Lage 34 der Papierlage 20 perforiert. Die Perforation 38, die in Figur 4 mit Kreuzchen dargestellt ist, verläuft in gleicher Weise wie die Überlappung als Streifen vom Boden 12 zum Oberteil 14. Vorteilhafterweise beträgt die Breite B2 des Perforationsstreifens etwa die Hälfte der Breite B1 des Überlappungsstreifens 20. Die zum Sackäußeren gewandte Lage 36 der Papierlage 20 weist im Überlappungsbereich keine Perforationen auf. Dadurch werden die Perforationen 38 überdeckt. FIG. 4 shows the configuration of the overlapping region 22 of the paper layer 20 according to a first exemplary embodiment of the invention. In addition to the inner edge 26 of the overlap, the overlapping region is glued sealingly to the interior of the bag with a continuous glue line 24. To the outside of the bag, the outer edge 28 of the overlap is loose, that is not glued. In the area of the overlap 22, the layer 34 of the paper layer 20 facing the interior of the bag is perforated. The perforation 38, which is shown in Figure 4 with a cross, runs in the same way as the overlap as a strip from the bottom 12 to the top 14. Advantageously, the width B2 of the perforation strip is about half the width B1 of the overlap strip 20. The turned to the outside of the bag Layer 36 of the paper layer 20 has no perforations in the overlap area. As a result, the perforations 38 are covered.
In dem Ausführungsbeispiel nach Figur 5 ist die Überlappung entlang der Außenkante 28 mit einer unterbrochenen Klebelinie 32 verklebt. Dadurch ist die Überlappung an der Außenkante 28 stabilisiert. In the embodiment according to FIG. 5, the overlap along the outer edge 28 is glued to a broken glue line 32. As a result, the overlap on the outer edge 28 is stabilized.
Mit der Erfindung wird eine Reihe von Vorteilen erreicht. Insbesondere kann der Papiersack beim Befüllen gut entlüftet werden, und durch die gasdichte Beschich- tung an der Innenseite des Sackes und die Überdeckung der Entlüftungsperforationen beim gefüllten Sack wird ein hoher Produktschutz sowie eine verlängerte Produktstabilität des Füllgutes erreicht. Zudem vereinfacht sich die Herstellung des Sackes gegenüber dem Stand der Technik EP 1 858 769 B1 , da keine separate Sperrschicht zwischen zwei Papierlagen eingelegt werden muss. With the invention, a number of advantages are achieved. In particular, the paper bag can be well vented during filling, and by the gas-tight coating on the inside of the bag and the overlap of the vent perforations in the filled bag high product protection and prolonged product stability of the filling is achieved. In addition, the manufacture of the bag is simplified compared to the prior art EP 1 858 769 B1, since no separate barrier layer has to be inserted between two paper layers.

Claims

Patentansprüche claims
1. Papiersack (10) für Schüttgut wie Zement, Gips, Granulat, Tierfutter o. Ä., mit einem Boden (12), vorzugsweise einem Kreuz- oder Blockboden, und mit einem dem Boden gegenüberliegenden Oberteil (14), in dem ggf. ein Ventilschlauch (15) zum Befüllen des Papiersacks angeordnet ist, dadurch gekennzeichnet, daß der Papiersack eine beschichte Papierlage (20) aufweist, mit einer zum Sackinneren gewandten gasdichten Beschichtung (42, 43, 44, 45, 46), wobei die Beschichtung die mit dem Füllgut in Kontakt stehende Oberfläche der Innenwand des Papiersackes bildet, und wobei die beschichtete Papierlage (20) eine Überlappung (22) aufweist, die zum Sackinneren hin dichtend verklebt ist, und wobei im Bereich der Überlappung die zum Sackinneren gewandte Lage (34) der beschichteten Papierlage (20) Perforationen (38) aufweist, die von der zum Sackäußeren gewandten Lage (36) der beschichteten Papierlage überdeckt werden. 1. paper bag (10) for bulk material such as cement, gypsum, granules, animal feed or the like, with a bottom (12), preferably a cross or block bottom, and with a bottom opposite the top (14), in which a valve tube (15) is arranged for filling the paper sack, characterized in that the paper sack has a coated paper layer (20), with a gas-tight coating (42, 43, 44, 45, 46) facing the interior of the sack, wherein the coating with the coated material layer (20) has an overlap (22), which is glued to the bag interior sealingly, and wherein in the region of the overlap facing the interior of the bag (34) coated paper layer (20) has perforations (38) which are covered by the facing to the outside of the sheet layer (36) of the coated paper layer.
2. Papiersack nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Überlappung der beschichteten Papierlage mindestens 3 % des Sa- ckumfangs, vorzugsweise mindestens 10 % des Sackumfangs und weiter vorzugsweise mindestens 17 % bis maximal 25 % des Sackumfangs beträgt. 2. Paper sack according to the preceding claim, characterized in that the overlap of the coated paper layer is at least 3% of the bag size, preferably at least 10% of the bag size and more preferably at least 17% to at most 25% of the bag size.
3. Papiersack nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die nach innen gewandte Beschichtung (42, 43, 44, 45, 46) der beschichteten Papierlage (20) mehrschichtig aufgebaut ist. 3. Paper bag according to one of the preceding claims, characterized in that the inwardly facing coating (42, 43, 44, 45, 46) of the coated paper layer (20) is constructed in multiple layers.
4. Papiersack nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die nach innen gewandte Beschichtung der beschichteten Papierlage eine metallisierte Folie und/oder eine Metallfolie umfasst. 4. Paper bag according to one of the preceding claims, characterized in that the inwardly facing coating of the coated paper layer comprises a metallized film and / or a metal foil.
5. Papiersack nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Perforation (38) in der Innenlage (34) der Überlappung (22) der beschichteten Papierlage durch eine Nadelung und/oder eine oder mehrere Schlitzungen gebildet ist. 5. Paper bag according to one of the preceding claims, characterized in that the perforation (38) in the inner layer (34) of the overlap (22) of the coated paper layer is formed by a needling and / or one or more slits.
6. Papiersack nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass die Überlappung in einem mittleren Bereich und/oder im Bereich ihres Randes zum Sackäußeren zusätzliche Verklebungen (32) aufweist, wobei die zusätzlichen Verklebungen durchlässig zum Sackäußeren ausgebildet sind, vorzugsweise als unterbrochene Klebelinien (32). 6. Paper bag according to one of the preceding claims, characterized in that the overlap in a central region and / or in the region of its edge to the outer side of additional adhesions (32), wherein the additional bonds are permeable to the exterior of the bag, preferably as interrupted adhesive lines ( 32).
7. Papiersack nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die beschichtete Papierlage weitere Überlappungen aufweist, die gemäß einem der vorhergehenden Ansprüche ausgebildet sind, vorzugsweise derart, dass eine Überlappung auf der Vorderseite des Sackes und eine weitere auf der Rückseite ausgebildet ist. 7. Paper bag according to one of the preceding claims, characterized in that the coated paper layer has further overlaps, which are formed according to one of the preceding claims, preferably such that an overlap on the front side of the bag and another is formed on the back.
8. Papiersack nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass als Umhüllung der beschichteten Papierlage (20) eine oder mehrere weitere Materiallagen vorhanden sind, die beim Befüllen des Papiersackes Luft nach außen entweichen lassen, und die aus zur Sackherstellung geeigneten Materialien gebildet sind, vorzugsweise aus Papier, beschichtetem Papier, Folie und/oder beschichteter Folie. 8. paper bag according to one of the preceding claims, characterized in that as a coating of the coated paper layer (20) one or more further material layers are present, which allow air to escape during filling of the paper bag to the outside, and are formed from materials suitable for bag making, preferably of paper, coated paper, foil and / or coated foil.
EP14718510.2A 2013-04-30 2014-04-10 Bag made of paper Active EP2991911B1 (en)

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DE202013004058.0U DE202013004058U1 (en) 2013-04-30 2013-04-30 paper bags
PCT/EP2014/000966 WO2014177248A1 (en) 2013-04-30 2014-04-10 Paper sack

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EP2991911B1 EP2991911B1 (en) 2017-02-01

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JP (1) JP6454688B2 (en)
CN (1) CN105228913B (en)
DE (1) DE202013004058U1 (en)
HK (1) HK1220957A1 (en)
MX (1) MX2015015080A (en)
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DE102016220428A1 (en) 2016-09-27 2018-03-29 Windmöller & Hölscher Kg Valve bag and method and system for producing a valve sack

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JP6454688B2 (en) 2019-01-16
JP2016520487A (en) 2016-07-14
EP2991911B1 (en) 2017-02-01
CN105228913B (en) 2017-05-10
US10071834B2 (en) 2018-09-11
MX2015015080A (en) 2016-02-25
WO2014177248A1 (en) 2014-11-06
US20160083144A1 (en) 2016-03-24
DE202013004058U1 (en) 2014-08-01
CN105228913A (en) 2016-01-06

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