EP2004505B1 - Packaging for bulk materials, especially bag made of plastic film - Google Patents

Packaging for bulk materials, especially bag made of plastic film Download PDF

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Publication number
EP2004505B1
EP2004505B1 EP07722141A EP07722141A EP2004505B1 EP 2004505 B1 EP2004505 B1 EP 2004505B1 EP 07722141 A EP07722141 A EP 07722141A EP 07722141 A EP07722141 A EP 07722141A EP 2004505 B1 EP2004505 B1 EP 2004505B1
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EP
European Patent Office
Prior art keywords
packaging
air
layer
wall
multilayer
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Not-in-force
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EP07722141A
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German (de)
French (fr)
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EP2004505A1 (en
Inventor
Michael Kreymborg
Ulla Heckmann
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Nordfolien GmbH
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Nordfolien GmbH
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Publication of EP2004505A1 publication Critical patent/EP2004505A1/en
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    • 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 package for bulk materials, in particular sack made of plastic film, with a bulk material enveloping the packaging wall, which has at least one multilayer wall portion of at least one inner layer and at least one outer layer, wherein the multilayer wall region extends in a packaging longitudinal direction and Each layer has at least one air-permeable surface piece, wherein between the inner layer and the outer layer at least one guide member for the air-permeable surface pieces passing air flow is arranged, wherein the guide member for deflecting the air flow from at least a portion of an air-impermeable liner is formed, which is a separate , Between the layers of the multilayer wall region in the package longitudinal direction extending, at least on one side flow around film strips.
  • Known packages are bags or sacks made of a film, in particular plastic film, which are used for wrapping a variety of bulk or filling goods, such as cement, fertilizers or similar products that are produced for example in the building materials industry or the chemical industry.
  • a valve strip for a one-way vent is provided, which covers the openings in the inner layer like a valve.
  • the openings of the outer layer are formed laterally along the longitudinal edges of the valve strip.
  • the US-A-5,996,800 shows a packaging bag made of a plastic film, the packaging bag having in its packaging wall an opening which is of a folded, two-ply and with the outside of the Packaging bag cohesively connected piece of material is covered.
  • the upper layer of the folded piece of material is circumferentially connected to the outside of the packaging bag and has an opening which is arranged approximately congruent to the opening in the packaging wall. Through the lower layer of the folded piece of material, which is located between the upper layer and the packaging wall, the openings are covered.
  • valve for packaging
  • the valve comprises a wall of cardboard, in which at least one breakthrough is introduced.
  • an air-impermeable membrane is arranged, which is held by a glued on the inside of the valve wall thin film in a predetermined position.
  • the thin film further comprises an opening covered by the membrane is formed, through which flows at an overpressure in the interior of the package in areas between the thin film and the wall of cardboard air.
  • About the unglued strip to the uncovered openings in the cardboard wall then passes through the air through this outward.
  • the DE 81 33 295 U1 describes a packaging container made of a plastic film, which comprises a multilayer wall region, wherein openings are provided for venting from the packaging interior in each layer of the multi-layer area. Between the inner and outer layer of the multi-layer area an air-permeable filter material is used to prevent leakage of fine-grained product from the packaging interior.
  • the filter material is a fiber flow, in which a large part of the particles of the filling material is retained.
  • the invention has for its object to improve a package of the aforementioned genus such that in addition to a structurally simplified design ensures optimal ventilation and at the same time the dusting of the contents is reliably prevented.
  • a packaging wall enveloping the bulk material, which has at least one multilayer wall portion of at least one inner layer and at least one outer layer, wherein the multilayer wall region extends in a packaging longitudinal direction and each layer at least one air permeable surface piece, wherein between the inner layer and the outer layer at least one guide member for the air permeable surface pieces passing air flow is arranged, wherein the guide member for deflecting the air flow from at least a portion of an air-impermeable liner is formed, which is a separate, between the layers of the multilayer wall region extending in the packaging longitudinal direction, at least on one side flow around film strip, the invention provides that the inner layer of the multilayer wall region by means of a sep Araten material strip is formed, which is arranged in the interior of the package, and that with the intermediate layer at least the air-permeable surface portions of the inner layer and the outer layer are covered.
  • the guide element arranged according to the invention influences the flow of the air escaping from the interior of the packaging, so that a straight or direct passage of air through the multi-layered wall region of the packaging wall and the associated discharge of solid particles of the introduced filling material is advantageously prevented.
  • the strong change or deflection of the flow of the escaping air flow causes, due to the higher inertia of the solid particles, a nearly complete separation of the solid particles from the multi-layered wall area passing air flow. It is for Example possible that multiple, mutually entangled guide members are present in multi-layered wall area, forming the overlapping areas.
  • the guide member is at least a portion of an air-impermeable intermediate layer, which is arranged such that at least the air-permeable surface portions of the inner layer and the outer layer are covered by the intermediate layer.
  • Each section of the air-impermeable intermediate layer which can be, for example, a film, also serves as a baffle or separating element for the discharged with the escaping air flow solid particles. Due to the intermediate layer projecting into the air flow and the associated deflection of the air flow, regions with increased flow or turbulences and regions with poorer flow occur in the multi-layered wall region. Especially in the areas with reduced flow velocity, the kinetic energy of the air flow is no longer sufficient to carry the solid particles due to their mass.
  • the guide member is also formed as a separately arranged between the inner and outer layer of the multi-layer wall region arranged film strip.
  • film strips can be arranged in an advantageously simple manner both in sections and over the entire length of the double-layered wall region extending between the inner and outer layer.
  • the film strip can then be fixed over one of its longitudinal sides to at least one of the layers of the multilayer wall region.
  • the inner layer of the multilayer wall region is according to the invention formed by a separate strip of material, which is arranged in the interior of the package.
  • the material strip completely covers the guide element formed, for example, as a film strip, and in the region of both side edges it can be connected over its entire length to the packaging wall in each case by means of gluing or welding.
  • predetermined partial surfaces of the guide element are at least partially connected to at least one of the layers of the multi-layer wall region.
  • the guide element can be fixed in an advantageously simple manner in the multi-layered wall region.
  • this can be formed on the guide member two umströmbare from the air flow longitudinal sides, so that advantageously an improved ventilation when filling the package is guaranteed.
  • a cohesive connection can take place both between the inner layer and respectively associated sub-surfaces of the guide element and between the outer layer and respectively associated sub-surfaces of the guide element.
  • the packaging wall is a folded flat web with overlapping edge regions.
  • the mutually overlapping edge regions can be fixed to each other in a desired arrangement by means of a material connection such as welding and / or gluing.
  • a sufficient strength in the connection region of the packaging wall is given on the material connection, so that during the filling process in the packaging interior resulting positive pressure can be absorbed with advantage over the entire packaging wall, without causing any adverse effects.
  • Each packaging wall has in the air-permeable surface pieces perforations, which are preferably formed as rows of circular holes and / or slots in the inner or outer layer.
  • perforations are preferably formed as rows of circular holes and / or slots in the inner or outer layer.
  • At least in some areas of the air-permeable surface pieces of each layer and / or the guide element at least one spacer is arranged.
  • Each spacer additionally improves the escape of the air that has entered the packaging together with the contents from the packaging interior.
  • the spacers are preferably arranged between the guide member formed as an intermediate layer and a respectively adjacent layer, so that adhesion forces between the adjoining surfaces of the guide element and the layers can not occur. Such attractions could hinder passage of the airflow.
  • each spacer may be formed as an introduced into the layers and / or the guide member embossing.
  • the imprints preferably formed in the packaging longitudinal direction of the multilayer wall region of the packaging wall provide an advantageously simple possibility for maintaining a distance between, for example, two film webs contacting one another.
  • the plastic and permanent deformation of the layers required for producing an embossing can be effected in an advantageously simple manner by means of embossing tools.
  • the Embossing can be brought in sections as well as consistently in sub-areas such as a flat web, which can be used to form the packaging wall.
  • Fig. 1 shows a gusseted bag 1, the packaging wall 2, both in the bottom region 3 and in the head area 4, in particular by means of a weld 5, 5 'can be closed by a material fit.
  • the packaging wall 2 has a multi-layered wall region, which is formed from an inner layer 7 and an outer layer 8.
  • the inner layer 7 and the outer layer 8 each have an air-permeable sheet 9 in the longitudinal direction of the packaging.
  • the air permeability of the layers 7, 8 is ensured by perforations formed therein as perforations, which allow leakage of the air that has entered the packaging interior 11 during the filling process.
  • an intermediate layer 12 is arranged between the layers 7, 8 of the multi-layered wall region.
  • the intermediate layer 12 assumes the function of a guide element for the escaping air flow and at the same time a separating element for the entrained in the air flow solid particles of the filling material.
  • adhesion forces are in predetermined portions of the layers 7,8 than Embossments 13 formed spacers arranged.
  • Fig. 2 shows an embodiment according to the invention of a bag 23, which is shown to illustrate the structure in cross section.
  • the packaging wall 24 is made of a folded flat web whose edges are connected to one another via a fabric connection 25.
  • a separate material web is applied on the inside of the packaging wall 24 and forms the inner layer 27 of the bag.
  • a firm connection between the formed as a material strip inner layer 27 and the packaging wall 24 is ensured via the fabric joints 28, 28 '.
  • a trained as a separate film strip liner 30 is introduced, which is flowed around by the multilayer wall area passing air flow.
  • the intermediate layer 30 with predetermined partial surfaces is fastened to the layers 27, 29 of the multi-layered wall region via the fabric joints 31, 31 'in such a way that the intermediate layer forms two longitudinal sides which can be flowed around by the air flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Laminated Bodies (AREA)
  • Buffer Packaging (AREA)

Abstract

Disclosed is a packaging (1) for bulk material, especially a bag made of plastic film, comprising a packaging wall (2) which envelops the bulk material and is provided with at least one multilayered wall area (6) that is composed of at least one inner layer (7) and at least one outer layer (8). Each layer has at least one air-permeable planar piece (9). At least one conducting element (12) for the air flow that penetrates the air-permeable planar pieces is disposed between the inner layer (7) and the outer layer (8). The conducting element (12) is embodied as at least one section of an airtight intermediate layer which is arranged such that at least the air-permeable planar pieces (9) of the inner layer (7) and/or the outer layer (8) are covered.

Description

Die Erfindung bezieht sich auf eine Verpackung für Schüttgüter, insbesondere Sack aus Kunststofffolie, mit einer das Schüttgut einhüllenden Verpackungswand, die wenigstens einen mehrlagig ausgebildeten Wandbereich aus zumindest einer inneren Lage und mindestens einer äußeren Lage aufweist, wobei der mehrlagige Wandbereich sich in einer Verpackungslängsrichtung erstreckt und jede Lage mindestens ein luftdurchlässiges Flächenstück aufweist, wobei zwischen der inneren Lage und der äußeren Lage wenigstens ein Leitorgan für den die luftdurchlässigen Flächenstücke passierenden Luftstrom angeordnet ist, wobei das Leitorgan zur Umlenkung des Luftstromes aus zumindest einem Abschnitt einer luftundurchlässigen Zwischenlage gebildet ist, welche ein separater, zwischen den Lagen des mehrlagigen Wandbereiches in Verpackungslängsrichtung verlaufender, wenigstens einseitig umströmbarer Folienstreifen ist.The invention relates to a package for bulk materials, in particular sack made of plastic film, with a bulk material enveloping the packaging wall, which has at least one multilayer wall portion of at least one inner layer and at least one outer layer, wherein the multilayer wall region extends in a packaging longitudinal direction and Each layer has at least one air-permeable surface piece, wherein between the inner layer and the outer layer at least one guide member for the air-permeable surface pieces passing air flow is arranged, wherein the guide member for deflecting the air flow from at least a portion of an air-impermeable liner is formed, which is a separate , Between the layers of the multilayer wall region in the package longitudinal direction extending, at least on one side flow around film strips.

Bekannte Verpackungen sind Beutel oder Säcke aus einer Folie, insbesondere Kunststofffolie, welche zur Umhüllung unterschiedlichster Schütt- bzw. Füllgüter, wie zum Beispiel Zement, Düngemittel oder dergleichen Produkte, die beispielsweise in der Baustoffindustrie bzw. der chemischen Industrie hergestellt werden, dienen.Known packages are bags or sacks made of a film, in particular plastic film, which are used for wrapping a variety of bulk or filling goods, such as cement, fertilizers or similar products that are produced for example in the building materials industry or the chemical industry.

Beim Befüllvorgang bekannter Verpackungen gelangt neben dem Füllgut auch ein entsprechender Anteil an Luft mit in das Verpackungsinnere, wodurch auf der Innenseite der Verpackungswand ein Überdruck entsteht. Damit die Verpackungswand, aufgrund des an der Innenseite anliegenden Überdrucks nicht beschädigt wird und/oder gegebenenfalls aufreißt bzw. durch das im Inneren der Verpackung eingeschlossene Luftpolster eine erschwerte Palettierung verursacht wird, muss stets für eine ausreichende Entlüftung aus dem Verpackungsinneren gesorgt werden. In der EP 444 261 ist eine Verpackung beschrieben, die insbesondere zur Aufnahme von feinstaubigen Füllgütern eingesetzt wird. Die bekannte Verpackung weist einen mit Perforationen versehenen zweilagigen Bereich zur Entlüftung auf, über den der im Inneren der Verpackung vorherrschende Überdruck abgebaut werden kann. Sind die Perforationen der Innen- und Außenwand deckungsgleich angeordnet, können gegebenenfalls mit dem entweichenden Luftstrom auch Feststoffpartikel des Füllgutes austreten. Das Ausstauben kleinerer Feststoffpartikel aus der Verpackung kann unter Verwendung eines Filters verhindert werden, der im zweilagigen Bereich der Verpackung angeordnet ist. Jedoch bedeutet der Einsatz von Filtermaterial stets einen erhöhten Kostenaufwand und gleichzeitig eine konstruktiv aufwendige Ausgestaltung der Verpackung.When filling known packaging comes in addition to the contents and a corresponding proportion of air in the packaging interior, creating an overpressure on the inside of the packaging wall. To ensure that the packaging wall is not damaged due to the overpressure applied to the inside and / or possibly ruptures, or that the palletization enclosed inside the packaging causes difficult palletizing, sufficient ventilation from the inside of the packaging must always be ensured. In the EP 444 261 a package is described, which is used in particular for receiving fine dusty products. The known packaging has a perforated two-layered area for venting, via which the pressure prevailing inside the packaging can be reduced. If the perforations of the inner and outer walls are arranged congruently, solid particles of the filling material can optionally escape with the escaping air flow. Dusting of smaller solid particles from the package can be prevented by using a filter located in the two-ply region of the package. However, the use of filter material always means an increased cost and at the same time a structurally complex design of the packaging.

Des Weiteren ist aus der DE 44 08 244 A1 ein Verpackungsbehälter aus einem Folienlaminat mit wenigstens zwei Schichten bekannt, wobei die Schichten außer einen streifenförmigen Kanal ausbildend, vollflächig miteinander verbunden sind. Im Bereich des Kanals weisen die Schichten Durchbrüche auf, welche versetzt zueinander angeordnet sind. In dem sich in Verpackungslängsrichtung erstreckenden Kanal ist ein Ventilstreifen für eine Einwegentlüftung vorgesehen, der dabei die Durchbrüche in der inneren Schicht ventilartig abdeckt. Die Durchbrüche der äußeren Schicht sind dabei seitlich entlang der Längskanten des Ventilstreifens ausgebildet.Furthermore, from the DE 44 08 244 A1 a packaging container of a film laminate with at least two layers known, wherein the layers except for a strip-shaped channel forming, are connected to each other over the entire surface. In the region of the channel, the layers have openings, which are offset from one another. In the extending in the packaging longitudinal direction channel a valve strip for a one-way vent is provided, which covers the openings in the inner layer like a valve. The openings of the outer layer are formed laterally along the longitudinal edges of the valve strip.

Die US-A-5,996,800 zeigt einen Verpackungsbeutel aus einer Kunststofffolie, wobei der Verpackungsbeutel in seiner Verpackungswand eine Öffnung aufweist, die von einem gefalteten, zweilagigen und mit der Außenseite des Verpackungsbeutels stoffschlüssig verbundenen Materialstück abgedeckt ist. Die obere Lage des gefalteten Materialstücks ist umlaufend mit der Außenseite des Verpackungsbeutels verbunden und weist eine Öffnung auf, die etwa deckungsgleich zur Öffnung in der Verpackungswand angeordnet ist. Durch die untere Lage des umgefalteten Materialstückes, welches sich zwischen der oberen Lage und der Verpackungswand befindet, werden die Öffnungen abgedeckt.The US-A-5,996,800 shows a packaging bag made of a plastic film, the packaging bag having in its packaging wall an opening which is of a folded, two-ply and with the outside of the Packaging bag cohesively connected piece of material is covered. The upper layer of the folded piece of material is circumferentially connected to the outside of the packaging bag and has an opening which is arranged approximately congruent to the opening in the packaging wall. Through the lower layer of the folded piece of material, which is located between the upper layer and the packaging wall, the openings are covered.

Nach der EP 1 481 911 A1 ist ein Einwegventil für eine Verpackung bekannt, wobei das Ventil eine Wand aus Pappe umfasst, in die wenigstens ein Durchbruch eingebracht ist. Auf der Innenseite dieser Wand ist eine luftundurchlässige Membran angeordnet, die von einer auf der Innenseite der Ventilwand aufgeklebten Dünnschichtfolie in einer vorbestimmten Position gehalten wird. In der Dünnschichtfolie ist des Weiteren eine von der Membran abgedeckte Öffnung ausgebildet, durch die bei einem Überdruck im Inneren der Verpackung in Bereiche zwischen die Dünnschichtfolie und die Wand aus Pappe Luft einströmt. Über die unverklebten Streifen zu den nicht abgedeckten Durchbrüchen in der Pappwand gelangt dann die Luft durch diese nach außen.After EP 1 481 911 A1 a one-way valve for packaging is known, wherein the valve comprises a wall of cardboard, in which at least one breakthrough is introduced. On the inside of this wall an air-impermeable membrane is arranged, which is held by a glued on the inside of the valve wall thin film in a predetermined position. In the thin film further comprises an opening covered by the membrane is formed, through which flows at an overpressure in the interior of the package in areas between the thin film and the wall of cardboard air. About the unglued strip to the uncovered openings in the cardboard wall then passes through the air through this outward.

Die DE 81 33 295 U1 beschreibt einen Verpackungsbehälter aus einer Kunststofffolie, der einen mehrlagigen Wandbereich umfasst, wobei in jeder Lage des Mehrlagenbereiches Durchbrüche zur Entlüftung aus dem Verpackungsinneren vorgesehen sind. Zwischen die innere und äußere Lage des Mehrlagenbereiches ist ein luftdurchlässiges Filtermaterial eingesetzt, das ein Austreten von feinkörnigem Füllgut aus dem Verpackungsinneren verhindern soll. Das Filtermaterial ist dabei ein Faserfließ, in dem ein Großteil der Partikel des Füllgutes zurückgehalten wird.The DE 81 33 295 U1 describes a packaging container made of a plastic film, which comprises a multilayer wall region, wherein openings are provided for venting from the packaging interior in each layer of the multi-layer area. Between the inner and outer layer of the multi-layer area an air-permeable filter material is used to prevent leakage of fine-grained product from the packaging interior. The filter material is a fiber flow, in which a large part of the particles of the filling material is retained.

Der Erfindung liegt die Aufgabe zugrunde, eine Verpackung der vorbezeichneten Gattung derart zu verbessern, dass neben einer konstruktiv vereinfachten Ausgestaltung eine optimale Entlüftung gewährleistet und gleichzeitig das Ausstauben des Füllgutes zuverlässig verhindert ist.The invention has for its object to improve a package of the aforementioned genus such that in addition to a structurally simplified design ensures optimal ventilation and at the same time the dusting of the contents is reliably prevented.

Die Lösung dieser Aufgabe erfolgt erfindungsgemäß durch eine Verpackung für Schüttgüter mit den Merkmalen des Patentanspruchs 1. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The solution of this object is achieved according to the invention by a package for bulk materials with the features of claim 1. Advantageous developments and refinements of the invention are specified in the dependent claims.

Bei einer Verpackung für Schüttgüter, insbesondere Sack aus Kunststofffolie, mit einer das Schüttgut einhüllenden Verpackungswand, die wenigstens einen mehrlagig ausgebildeten Wandbereich aus zumindest einer inneren Lage und mindestens einer äußeren Lage aufweist, wobei der mehrlagige Wandbereich sich in einer Verpackungslängsrichtung erstreckt und jede Lage mindestens ein luftdurchlässiges Flächenstück aufweist, wobei zwischen der inneren Lage und der äußeren Lage wenigstens ein Leitorgan für den die luftdurchlässigen Flächenstücke passierenden Luftstrom angeordnet ist, wobei das Leitorgan zur Umlenkung des Luftstromes aus zumindest einem Abschnitt einer luftundurchlässigen Zwischenlage gebildet ist, welche ein separater, zwischen den Lagen des mehrlagigen Wandbereiches in Verpackungslängsrichtung verlaufender, wenigstens einseitig umströmbarer Folienstreifen ist, ist erfindungsgemäß vorgesehen, dass die innere Lage des mehrlagigen Wandbereiches mittels eines separaten Materialstreifens ausgebildet ist, welcher im Innenbereich der Verpackung angeordnet ist, und dass mit der Zwischenlage zumindest die luftdurchlässigen Flächenstücke der inneren Lage und der äußeren Lage abgedeckt sind.In a package for bulk materials, in particular a bag made of plastic film, with a packaging wall enveloping the bulk material, which has at least one multilayer wall portion of at least one inner layer and at least one outer layer, wherein the multilayer wall region extends in a packaging longitudinal direction and each layer at least one air permeable surface piece, wherein between the inner layer and the outer layer at least one guide member for the air permeable surface pieces passing air flow is arranged, wherein the guide member for deflecting the air flow from at least a portion of an air-impermeable liner is formed, which is a separate, between the layers of the multilayer wall region extending in the packaging longitudinal direction, at least on one side flow around film strip, the invention provides that the inner layer of the multilayer wall region by means of a sep Araten material strip is formed, which is arranged in the interior of the package, and that with the intermediate layer at least the air-permeable surface portions of the inner layer and the outer layer are covered.

Das erfindungsgemäß angeordnete Leitorgan beeinflusst die Strömung der aus dem Verpackungsinneren entweichenden Luft, so dass ein geradliniger bzw. direkter Luftdurchgang durch den mehrlagig ausgebildeten Wandbereich der Verpackungswand und der damit verbundene Austritt von Feststoffpartikeln des eingebrachten Füllgutes mit Vorteil verhindert ist. Die starke Änderung bzw. Umlenkung der Strömung des entweichenden Luftstromes bewirkt, aufgrund der höheren Massenträgheit der Feststoffpartikel, ein nahezu vollständiges Ausscheiden der Feststoffpartikel aus dem den mehrlagig ausgebildeten Wandbereich passierenden Luftstrom. Es ist zum Beispiel möglich, dass mehrere, gegeneinander verschränkt angeordnete Leitorgane im mehrlagig ausgebildeten Wandbereich vorhanden sind, die einander überlappende Bereiche ausbilden. Dabei ist das Leitorgan zumindest ein Abschnitt einer luftundurchlässigen Zwischenlage, die derart angeordnet ist, dass zumindest die luftdurchlässigen Flächenstücke der inneren Lage und der äußeren Lage durch die Zwischenlage abgedeckt sind. Jeder Abschnitt der luftundurchlässigen Zwischenlage, die beispielsweise eine Folie sein kann, dient zudem auch als Prallfläche oder Abscheideorgan für die mit dem entweichenden Luftstrom ausgetragenen Feststoffpartikel. Durch die in den Luftstrom hineinragende Zwischenlage und der damit verbundenen Umlenkung des Luftstromes entstehen im mehrlagigen Wandbereich Gebiete mit verstärkter Strömung bzw. Turbulenzen und strömungsärmere Gebiete. Insbesondere in den Gebieten mit verringerter Strömungsgeschwindigkeit reicht die kinetische Energie des Luftstromes nicht mehr aus, um die Feststoffpartikel aufgrund ihrer Masse mitzuführen. Ein Großteil der Feststoff- bzw. Staubpartikel setzt sich somit hauptsächlich in den strömungsärmeren Gebieten des mehrlagigen Wandbereiches der Verpackung ab. Der dadurch nahezu komplett von Feststoffpartikeln befreite Luftstrom tritt nach Umströmen der Zwischenlage über die luftdurchlässigen Flächenstücke der äußeren Lage in die Umgebung aus. Weiterhin ist durch die die luftdurchlässigen Flächenstücke der inneren und äußeren Lage verdeckende Zwischenlage das Eindringen von Feuchtigkeit von außen in das Innere der Verpackung mit Vorteil erschwert.The guide element arranged according to the invention influences the flow of the air escaping from the interior of the packaging, so that a straight or direct passage of air through the multi-layered wall region of the packaging wall and the associated discharge of solid particles of the introduced filling material is advantageously prevented. The strong change or deflection of the flow of the escaping air flow causes, due to the higher inertia of the solid particles, a nearly complete separation of the solid particles from the multi-layered wall area passing air flow. It is for Example possible that multiple, mutually entangled guide members are present in multi-layered wall area, forming the overlapping areas. In this case, the guide member is at least a portion of an air-impermeable intermediate layer, which is arranged such that at least the air-permeable surface portions of the inner layer and the outer layer are covered by the intermediate layer. Each section of the air-impermeable intermediate layer, which can be, for example, a film, also serves as a baffle or separating element for the discharged with the escaping air flow solid particles. Due to the intermediate layer projecting into the air flow and the associated deflection of the air flow, regions with increased flow or turbulences and regions with poorer flow occur in the multi-layered wall region. Especially in the areas with reduced flow velocity, the kinetic energy of the air flow is no longer sufficient to carry the solid particles due to their mass. A large part of the solid or dust particles thus settles mainly in the less flowy areas of the multilayer wall area of the packaging. The thus almost completely freed of solid particles air flow occurs after flowing around the intermediate layer on the air-permeable patches of the outer layer in the environment. Furthermore, the penetration of moisture from the outside into the interior of the packaging is made more difficult by the air-permeable surface portions of the inner and outer layer covering intermediate layer.

Das Leitorgan ist darüber hinaus als ein separat zwischen der inneren und äußeren Lage des mehrlagig ausgebildeten Wandbereiches angeordneter Folienstreifen ausgebildet. Derartige Folienstreifen lassen sich auf vorteilhaft einfache Weise sowohl abschnittsweise als auch über die gesamte Länge des doppellagig ausgebildeten Wandbereiches erstreckend zwischen der inneren und äußeren Lage anordnen. Mit Hilfe zum Beispiel eines Klebeverfahrens kann dann der Folienstreifen über eine seiner Längsseiten an zumindest einer der Lagen des mehrlagigen Wandbereiches festgelegt werden. Die innere Lage des mehrlagigen Wandbereiches ist erfindungsgemäß mittels eines separaten Materialstreifens ausgebildet, welcher im Innenbereich der Verpackung angeordnet ist. Mit der Anordnung des sich in Verpackungslängsrichtung erstreckenden Materialstreifens auf der Innenseite der insbesondere aus einer Flachbahn gebildeten Verpackung ist die Herstellung der Verpackung weiter vereinfacht. Der Materialstreifen überdeckt dabei das beispielsweise als Folienstreifen ausgebildete Leitorgan vollständig und kann im Bereich beider Seitenkanten über seine gesamte Länge mit der Verpackungswand jeweils mittels einer Klebung oder Schweißung verbunden sein.The guide member is also formed as a separately arranged between the inner and outer layer of the multi-layer wall region arranged film strip. Such film strips can be arranged in an advantageously simple manner both in sections and over the entire length of the double-layered wall region extending between the inner and outer layer. With the aid of, for example, an adhesive method, the film strip can then be fixed over one of its longitudinal sides to at least one of the layers of the multilayer wall region. The inner layer of the multilayer wall region is according to the invention formed by a separate strip of material, which is arranged in the interior of the package. With the arrangement of the extending in the packaging longitudinal direction material strip on the inside of the packaging formed in particular from a flat web, the production of the packaging is further simplified. In this case, the material strip completely covers the guide element formed, for example, as a film strip, and in the region of both side edges it can be connected over its entire length to the packaging wall in each case by means of gluing or welding.

Es ist des Weiteren vorgesehen, dass vorbestimmte Teilflächen des Leitorgans zumindest abschnittsweise mit wenigstens einer der Lagen des mehrlagigen Wandbereiches verbunden sind. Über eine derartige Verbindung zwischen entsprechenden Teilflächen des Leitorgans und einer jeweiligen Lage kann das Leitorgan im mehrlagigen Wandbereich auf vorteilhaft einfache Weise fixiert werden. Außerdem lassen sich dadurch am Leitorgan zwei vom Luftstrom umströmbare Längsseiten ausbilden, so dass mit Vorteil eine verbesserte Entlüftung beim Befüllen der Verpackung gewährleistet ist. Vorzugsweise kann eine stoffschlüssig Verbindung sowohl zwischen der inneren Lage und jeweils zugeordneten Teilflächen des Leitorgans als auch zwischen der äußeren Lage und jeweils zugeordneten Teilflächen des Leitorgans erfolgen.It is further provided that predetermined partial surfaces of the guide element are at least partially connected to at least one of the layers of the multi-layer wall region. By means of such a connection between corresponding partial surfaces of the guide element and a respective position, the guide element can be fixed in an advantageously simple manner in the multi-layered wall region. In addition, this can be formed on the guide member two umströmbare from the air flow longitudinal sides, so that advantageously an improved ventilation when filling the package is guaranteed. Preferably, a cohesive connection can take place both between the inner layer and respectively associated sub-surfaces of the guide element and between the outer layer and respectively associated sub-surfaces of the guide element.

Die Verpackungswand ist eine gefaltete Flachbahn mit einander überlappenden Randbereichen. Mittels der gefalteten Flachbahn ist eine einfache Herstellung einer das Füllgut aufnehmenden Verpackungswand ermöglicht. Die einander überlappenden Randbereiche lassen sich mit Hilfe einer stoffschlüssigen Verbindung wie z.B. Schweißen und/oder Kleben zueinander in einer gewünschten Anordnung fixieren. Gleichzeitig ist über den Stoffschluss eine ausreichende Festigkeit im Verbindungsbereich der Verpackungswand gegeben, so dass der beim Befüllvorgang im Verpackungsinneren entstehende Überdruck mit Vorteil über die gesamte Verpackungswand aufgenommen werden kann, ohne Beeinträchtigungen zu verursachen. Es ist zum Beispiel auch möglich, die Verpackungswand aus einem mittels Blasextrusion hergestellten Folienschlauch zu erzeugen.The packaging wall is a folded flat web with overlapping edge regions. By means of the folded flat web a simple production of a filling material receiving the packaging wall is made possible. The mutually overlapping edge regions can be fixed to each other in a desired arrangement by means of a material connection such as welding and / or gluing. At the same time a sufficient strength in the connection region of the packaging wall is given on the material connection, so that during the filling process in the packaging interior resulting positive pressure can be absorbed with advantage over the entire packaging wall, without causing any adverse effects. It is also possible, for example, to produce the packaging wall from a film tube produced by blow extrusion.

Jede Verpackungswand weist in den luftdurchlässigen Flächenstücken Perforationen auf, die bevorzugt als Reihen von kreisförmigen Lochungen und/oder Schlitzen in der inneren bzw. äußeren Lage ausgebildet sind. Mit Hilfe der Perforationen ist eine konstruktiv einfache Ausgestaltung eines luftdurchlässigen Flächenstückes gegeben, wobei die Perforationen in die vorzugsweise als Kunststoffolie ausgebildete Verpackungswand über entsprechende Nadel- bzw. Schnittwerkzeuge eingebracht werden. Die Lochungen können dabei unterschiedliche Abmessungen in der inneren und äußeren Lage der Verpackungswand aufweisen.Each packaging wall has in the air-permeable surface pieces perforations, which are preferably formed as rows of circular holes and / or slots in the inner or outer layer. With the help of the perforations a structurally simple embodiment of an air-permeable surface piece is given, wherein the perforations are introduced into the preferably formed as a plastic film packaging wall via appropriate needle or cutting tools. The perforations may have different dimensions in the inner and outer layers of the packaging wall.

Zumindest in Teilbereichen der luftdurchlässigen Flächenstücke jeder Lage und/oder des Leitorgans ist wenigstens ein Abstandhalter angeordnet. Jeder Abstandhalter verbessert zusätzlich das Entweichen der gemeinsam mit dem Füllgut in die Verpackung gelangten Luft aus dem Verpackungsinneren. Die Abstandhalter sind bevorzugt zwischen dem als Zwischenlage ausgebildeten Leitorgan und einer jeweils benachbarten Lage angeordnet, so dass Adhäsionskräfte zwischen den aneinandergrenzenden Oberflächen des Leitorgans und der Lagen nicht auftreten können. Derartige Anziehungskräfte könnten eine Passage des Luftstroms behindern.At least in some areas of the air-permeable surface pieces of each layer and / or the guide element at least one spacer is arranged. Each spacer additionally improves the escape of the air that has entered the packaging together with the contents from the packaging interior. The spacers are preferably arranged between the guide member formed as an intermediate layer and a respectively adjacent layer, so that adhesion forces between the adjoining surfaces of the guide element and the layers can not occur. Such attractions could hinder passage of the airflow.

Nach einer Weiterbildung der Erfindung kann jeder Abstandhalter als eine in die Lagen und/oder das Leitorgan eingebrachte Prägung ausgebildet sein. Die vorzugsweise in Verpackungslängsrichtung des mehrlagigen Wandbereiches der Verpackungswand ausgebildeten Prägungen schaffen eine vorteilhaft einfache Möglichkeit zur Wahrung eines Abstandes zwischen beispielsweise zwei einander berührenden Folienbahnen. Die für eine Erzeugung einer Prägung erforderliche plastische und dauerhafte Verformung der Lagen kann auf vorteilhaft einfache Weise mittels Prägewerkzeugen erfolgen. Die Prägungen lassen sich sowohl abschnittsweise als auch durchgängig in Teilbereichen z.B. einer Flachbahn einbringen, die zur Ausbildung der Verpackungswand eingesetzt werden kann.According to a development of the invention, each spacer may be formed as an introduced into the layers and / or the guide member embossing. The imprints preferably formed in the packaging longitudinal direction of the multilayer wall region of the packaging wall provide an advantageously simple possibility for maintaining a distance between, for example, two film webs contacting one another. The plastic and permanent deformation of the layers required for producing an embossing can be effected in an advantageously simple manner by means of embossing tools. The Embossing can be brought in sections as well as consistently in sub-areas such as a flat web, which can be used to form the packaging wall.

Ein Ausführungsbeispiel der erfindungsgemäßen Verpackung, aus dem sich weitere erfinderische Merkmale ergeben, ist in der Zeichnung dargestellt. Es zeigen:

Fig. 1:
eine perspektivische Ansicht einer nicht erfindungsgemäßen Verpackung;
Fig. 2:
eine Ansicht einer erfindungsgemäßen Verpackung im Querschnitt.
An embodiment of the packaging according to the invention, from which further inventive features arise, is shown in the drawing. Show it:
Fig. 1:
a perspective view of a non-invention packaging;
Fig. 2:
a view of a package according to the invention in cross section.

Fig. 1 zeigt einen Seitenfalten-Sack 1, dessen Verpackungswand 2 sowohl im Bodenbereich 3 als auch im Kopfbereich 4 insbesondere mittels einer Schweißung 5, 5' stoffschlüssig verschlossen sein kann. Die Verpackungswand 2 weist einen mehrlagig ausgebildeten Wandbereich auf, der aus einer inneren Lage 7 und einer äußeren Lage 8 ausgebildet ist. Die innere Lage 7 und die äußere Lage 8 weisen jeweils in Verpackungslängsrichtung ein luftdurchlässiges Flächenstück 9 auf. Die Luftdurchlässigkeit der Lagen 7, 8 wird durch darin eingebrachte als Lochung ausgebildete 10 Perforationen gewährleistet, die ein Austreten der beim Befüllvorgang in das Verpackungsinnere 11 gelangten Luft ermöglicht. Damit Feststoffpartikel des eingefüllten Schüttgutes nicht zusammen mit dem entweichenden Luftstrom aus dem Verpackungsinneren austreten, ist zwischen den Lagen 7,8 des mehrlagig ausgebildeten Wandbereiches eine Zwischenlage 12 angeordnet. Die Zwischenlage 12 übernimmt die Funktion eines Leitorgans für den entweichenden Luftstrom und gleichzeitig eines Abscheideorgans für die im Luftstrom mitgerissenen Feststoffpartikel des Füllgutes. Um gegebenenfalls den Verschluss der Perforationen 10 in den Lagen 7,8 durch die zwischen den Lagen 7, 8 und der Zwischenlage 12 wirkenden Adhäsionskräfte zu verhindern, sind in vorbestimmten Teilbereichen der Lagen 7,8 als Prägungen 13 ausgebildete Abstandhalter angeordnet. Mittels der Perforation 10 und den Prägungen 13, die bevorzugt gemeinsam in einem Flächenstück einer jeweiligen Lage 7, 8 ausgebildet sind, ist stets eine optimale Entlüftung des Verpackungsinneren 11 gewährleistet. Fig. 1 shows a gusseted bag 1, the packaging wall 2, both in the bottom region 3 and in the head area 4, in particular by means of a weld 5, 5 'can be closed by a material fit. The packaging wall 2 has a multi-layered wall region, which is formed from an inner layer 7 and an outer layer 8. The inner layer 7 and the outer layer 8 each have an air-permeable sheet 9 in the longitudinal direction of the packaging. The air permeability of the layers 7, 8 is ensured by perforations formed therein as perforations, which allow leakage of the air that has entered the packaging interior 11 during the filling process. So that solid particles of the filled bulk material do not escape from the packaging interior together with the escaping air flow, an intermediate layer 12 is arranged between the layers 7, 8 of the multi-layered wall region. The intermediate layer 12 assumes the function of a guide element for the escaping air flow and at the same time a separating element for the entrained in the air flow solid particles of the filling material. In order optionally to prevent the closure of the perforations 10 in the layers 7,8 by acting between the layers 7, 8 and the intermediate layer 12 adhesion forces are in predetermined portions of the layers 7,8 than Embossments 13 formed spacers arranged. By means of the perforation 10 and the embossments 13, which are preferably formed together in a surface piece of a respective layer 7, 8, an optimal ventilation of the packaging interior 11 is always ensured.

Fig. 2 zeigt eine erfindungsgemäße Ausführungsform eines Sackes 23, der zur Verdeutlichung des Aufbaus im Querschnitt dargestellt ist. Die Verpackungswand 24 ist aus einer zusammengelegten Flachbahn gefertigt, deren Ränder über eine Stoffschlussverbindung 25 miteinander verbunden sind. Zur Ausbildung des mehrlagigen Wandbereiches 26 ist eine separate Materialbahn auf der Innenseite der Verpackungswand 24 aufgebracht und bildet die innere Lage 27 des Sackes aus. Eine feste Verbindung zwischen der als Materialstreifen ausgebildeten inneren Lage 27 und der Verpackungswand 24 wird über die Stoffschlussverbindungen 28, 28' sichergestellt. Zwischen der inneren Lage 27 und der äußeren 29 ist eine als separater Folienstreifen ausgebildete Zwischenlage 30 eingebracht, die vom den mehrlagigen Wandbereich passierenden Luftstrom umströmt wird. Dabei ist die Zwischenlage 30 mit vorbestimmten Teilflächen über die Stoffschlussverbindungen 31, 31' an den Lagen 27, 29 des mehrlagigen Wandbereiches derart befestigt, dass die Zwischenlage zwei vom Luftstrom umströmbare Längsseiten ausbildet. Fig. 2 shows an embodiment according to the invention of a bag 23, which is shown to illustrate the structure in cross section. The packaging wall 24 is made of a folded flat web whose edges are connected to one another via a fabric connection 25. To form the multilayer wall region 26, a separate material web is applied on the inside of the packaging wall 24 and forms the inner layer 27 of the bag. A firm connection between the formed as a material strip inner layer 27 and the packaging wall 24 is ensured via the fabric joints 28, 28 '. Between the inner layer 27 and the outer 29 a trained as a separate film strip liner 30 is introduced, which is flowed around by the multilayer wall area passing air flow. In this case, the intermediate layer 30 with predetermined partial surfaces is fastened to the layers 27, 29 of the multi-layered wall region via the fabric joints 31, 31 'in such a way that the intermediate layer forms two longitudinal sides which can be flowed around by the air flow.

Claims (6)

  1. A packaging for bulk goods, in particular a sack (23) of plastic film, with a packaging wall (24) enveloping the bulk goods, which has at least one wall region (26) of a multilayer design, with at least one inner layer (27), and at least one outer layer (29), wherein the multilayer wall region (26) extends in a longitudinal direction of the packaging, and each layer (27, 29), has at least one surface element that is permeable to air, wherein between the inner layer (27) and the outer layer (29) is arranged at least one agent for routing the flow of air passing through the air-permeable surface elements, wherein for purposes of redirecting the flow of air the routing agent is formed from at least one section of an intermediate layer (30) that is non-permeable to air, which is a separate strip of film, running between the layers (27, 29) of the multilayer wall region (26) in the longitudinal direction of the packaging, around at least one side of which strip flow can occur,
    characterised
    in that the inner layer (27) of the multilayer wall region (26) is formed by means of a separate strip of material, which is arranged in the interior region of the packaging, and
    in that at least the air-permeable surface elements (9) of the inner layer (27) and the outer layer (29) are covered with the intermediate layer (30).
  2. The packaging in accordance with Claim 1, characterised in that predetermined sub-surfaces of the routing agent are connected, at least in some sections, with at least one of the layers (27, 29) of the multilayer wall region (26).
  3. The packaging in accordance with one of the Claims 1 and 2, characterised in that the packaging wall (24) is a folded flat web, the overlapping edge regions of which form the wall region (26) of multilayer design.
  4. The packaging in accordance with one of the Claims 1 to 3, characterised in that the packaging wall has perforations in the air-permeable surface elements.
  5. The packaging in accordance with one of the Claims 1 to 4, characterised in that at least one spacer is arranged at least in sub-regions of the air-permeable surface elements (27, 29) and/or the routing agent.
  6. The packaging in accordance with Claim 5, characterised in that each spacer is designed as an embossment (13) introduced into the layers (27, 29) and/or the routing agent.
EP07722141A 2006-04-12 2007-03-30 Packaging for bulk materials, especially bag made of plastic film Not-in-force EP2004505B1 (en)

Applications Claiming Priority (2)

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DE102006017229A DE102006017229B4 (en) 2006-04-12 2006-04-12 Packaging for bulk goods, in particular bags of plastic film
PCT/DE2007/000583 WO2007115538A1 (en) 2006-04-12 2007-03-30 Packaging for bulk materials, especially bag made of plastic film

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EP2004505A1 EP2004505A1 (en) 2008-12-24
EP2004505B1 true EP2004505B1 (en) 2012-02-22

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EP (1) EP2004505B1 (en)
AT (1) ATE546377T1 (en)
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RU (1) RU2409506C2 (en)
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WO (1) WO2007115538A1 (en)

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US6170985B1 (en) * 1997-10-15 2001-01-09 Lyle F. Shabram, Jr. Bag with venting means
US6491433B2 (en) * 1997-10-15 2002-12-10 Lyle F. Shabram, Jr. Bag with venting means
US5996800A (en) * 1998-03-18 1999-12-07 Pratt; David W. Resealable plastic bag having venting means
JP4059753B2 (en) * 2002-11-14 2008-03-12 大和グラビヤ株式会社 Storage bag
EP1481911A1 (en) 2003-05-26 2004-12-01 P.L.V. Spa One-way degassing valve for containers of powder products
DE102004026538A1 (en) * 2004-05-27 2005-12-22 Haver & Boecker Ohg Bag of plastic film that can be filled with a bulk material
DK1607339T3 (en) * 2004-05-27 2008-07-21 Rkw Ag Plastic bag with compressed air vent

Also Published As

Publication number Publication date
WO2007115538A1 (en) 2007-10-18
ATE546377T1 (en) 2012-03-15
EP2004505A1 (en) 2008-12-24
DE102006017229B4 (en) 2008-06-05
US20090123094A1 (en) 2009-05-14
DE102006017229A1 (en) 2007-10-18
UA88850C2 (en) 2009-11-25
RU2409506C2 (en) 2011-01-20
RU2008144592A (en) 2010-05-20

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