EP0525337B1 - Multi-layered valve bag - Google Patents

Multi-layered valve bag Download PDF

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Publication number
EP0525337B1
EP0525337B1 EP92109513A EP92109513A EP0525337B1 EP 0525337 B1 EP0525337 B1 EP 0525337B1 EP 92109513 A EP92109513 A EP 92109513A EP 92109513 A EP92109513 A EP 92109513A EP 0525337 B1 EP0525337 B1 EP 0525337B1
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EP
European Patent Office
Prior art keywords
corner
cut
folded
valve bag
layers
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.)
Expired - Lifetime
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EP92109513A
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German (de)
French (fr)
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EP0525337A1 (en
Inventor
Alois Gröner
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Bischof and Klein SE and Co KG
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Bischof and Klein SE and Co KG
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Publication of EP0525337A1 publication Critical patent/EP0525337A1/en
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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
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/142—Valve bags, i.e. with valves for filling the filling port being formed by folding a flap connected to a side, e.g. block bottoms

Definitions

  • the invention relates to a multi-layer valve sack made of paper, plastic film or the like foldable material for in particular dusty or powdery filling material, the two ends of which are closed by a cross or similar shaped bottom, each of which is opposed in pairs and delimited by outer diagonal fold edges and a material-layer-related inner cut edge
  • corner folds and bottom side envelopes which are folded inward about bottom side fold lines running in the longitudinal direction of the bottom, taking along one end of each triangular corner of the adjacent corner fold and glued to one another and to the corner folds.
  • valve sacks of the specified type In order to improve the tightness of the sack bottoms, it is known for valve sacks of the specified type to incorporate a so-called inner bolt into the still open cross bottom and to glue it all around in the form of a suitable material cut to the inside of the bottom side envelopes and the outside of the corner inserts.
  • US-A-1903286 describes a valve sack according to the preamble of claim 1 in a single-layer version of the sack.
  • the invention has for its object to provide a multi-layer valve bag of the type mentioned, which has a high degree of tightness of its bag bottoms without the use of internal bolts and the like, and in particular prevents the penetration of filling parts into material pockets caused by the bottom construction .
  • the material sides or layers consisting of paper are preferably used, which allow the use of starch-based adhesives customary in paper bag production, while bag material comprising plastic films or plastic layers is used in the processing hot melt adhesives or hot melts can also be used in their place.
  • the flat-lying material web section 1 shown in FIG. 1 consists, for example, of a single paper layer and forms part of a coherent material web in the manufacturing process, formed in the course of their processing with overlap of their longitudinal edges 2 and 3 by means of a longitudinal seam 4 (FIG. 2) to form a tubular web, from which the individual bag tube sections 5 are separated as the starting workpiece for the valve bag to be produced and for the bottom formation at the two ends of the tube section 5 the corresponding fold lines are provided, which are shown in phantom in FIGS. 1 and 2.
  • FIG. 1 and 2 is the longitudinal center line of the finished valve bag, designated by 6.
  • the bottom side fold lines which are used to produce a cross bottom on the two sack ends and which run in the longitudinal direction of the bottom are denoted by 7, while the bottom center fold lines are denoted by 8.
  • the diagonal fold edges of the corner folds of the respective cross base to be formed have the reference number 9.
  • the hose side edges to be formed are designated by 10.
  • the material web section 1 or sack tube section 5 has a straight cut edge 11 at each of its two ends. From each cut edge 11, pairs of material cutouts 12 originate from each of the corner folds to be formed in a cross base, which are located in the finished cross base on the inner edge of a lateral triangular tip 13 each as part of the bottom side envelopes of the cross base to close it, folded inwards and glued to one another and to the corner folds. This is described in detail in connection with FIGS. 5 and 6 of the further exemplary embodiment, the FIGS. 3 and 4 of which correspond to FIGS. 1 and 2 of the first exemplary embodiment.
  • 3 and 4 illustrate a material web section 1 'and a bag hose section 5', which consists of three layers of material 14, 15 and 16, z. B. of paper, of which the material web 14 forms the inner layer, the material web 15 the intermediate layer and the material web 16 forms the outer layer.
  • the material layers 14, 15 and 16 have the in a manner known per se in the production of multi-layer sacks, for reasons of adhesive bonding, the alternating offset between them is common, both at their longitudinal edges 2 and 3 for producing the sack tube-forming longitudinal seam 4 and at their two ends defined by the separating or cutting edges 11.
  • Fig. 5 shows an instantaneous state of manufacture of a multi-layer cross bottom valve sack with the bag hose section 5 'according to Fig. 4 as a starting workpiece, in which the two ends are each drawn to an open cross bottom 17 and 18 and in a manner typical of the manufacturing process parallel to the main part of the Hose section 15 'are laid flat.
  • corner inserts 19 and 20 opposed to one another in pairs and bottom side envelopes 21 and 22 opposed to one another in pairs were created.
  • the corner turns 19 and 20 are each delimited by the outer diagonal fold edges 9 and the inner cut edge 11 of the material layers 14, 15 and 16.
  • the bottom side envelopes are in turn delimited in their central region on the outside by the respective cutting edge 11 of the material layers 14, 15 and 16 and on the inside by the bottom side fold lines 7, by which they are folded inwards to close the cross bottom 17 and 18, respectively.
  • the bottom side envelopes 21 and 22 at the ends comprise the lateral triangular tips 13, which are part of the bottom side envelopes 21 and 22 of these when folding inwards around the bottom side fold lines 7 are carried and come to rest on the corner folds 19 and 20.
  • the corner folds 19 and 20 are staggered positively in the open cross-bottom 17, while they are staggered negatively in the cross bottom 18.
  • the bottom-side cover 21 is negative and the bottom-side cover 22 is staggered
  • the bottom-side cover 21 is positive and the bottom-side cover 22 is staggered.
  • each lateral triangular tip 13 runs transversely to the bottom center fold line 8 in the area between its bottom side fold line 7 and its diagonal fold edge 9 and in this way exposes an adjacent area of the inside of the associated bottom side envelope 21 or 22.
  • the adhesive applications 23, identified by simple oblique hatching, are located on the outside of the corner inserts 19, 20 in the area of the triangular tips 13, which is not covered by the material cutout 12.
  • the adhesive layers 24 identified by cross hatching are located on the inside of the bottom side envelopes 21 and 22.
  • the adhesive layers 24 are located on each bottom side envelope 21 and 22 in the area that is identified by the material cutouts 12 in the triangular corners 13 of the corner corners 19 and 20 is exposed.
  • the adhesive is applied to the bottom side envelopes 21 and 22 to one another and to the adhesive layers 23 and 24 Corner folds 19 and 20 in the area between the bottom side fold lines 7.
  • the areas of the inside of the bottom side envelopes 21 and 22 exposed by the material cutouts 12 are glued in this area to the outside of the respective corner folds 19, 20.
  • the manufacturing steps for forming a single-ply cross-bottom valve sack are based on the bag hose section 5 according to FIG. Fig. 2, analogous to the processing steps described with reference to FIGS. 5 and 6 of a multi-layer cross bottom valve bag.
  • the material cutouts 12 are delimited by cutting lines running at right angles to one another. This results in a triangular material flap 26 which adjoins the outer cut line which opens into the diagonal fold edge 9 and which folds outwards into the plane of the respective bottom-side envelope 21 or 22 and includes it in the inner region exposed for the gluing by the material cutout 12 is.
  • the material cutout 12 run out in a radius at its inner end adjoining the bottom side fold line 7 and at its outer end adjoining the outer edge of the bottom side cover 21 or 22, or to make the material cutout 12 as an arc overall, for example by Punching out with a circular or elliptical shape and halving through the respective cut edge 11 of the bag hose 5 or 5 '.
  • a die is particularly suitable as a variant for plastic bags.
  • the material cutouts 12 are produced in the manner customary in such cases for the production of staggered cuts by means of suitable perforation knives in the manner of punched-outs, the individual sack tube sections 5 'being torn off at the end of the tube drawing machine along the perforation lines generated , or in the manufacture of a smooth or straight-cut sack, for example according to the single-layer sack hose section 5 according to FIG. 2, with appropriate cutting tools, the necessary material cutouts 12 are made following the formation of individual sack hose sections 5, for example in the floor-laying machine, or even in the flat web cut out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

In a valve bag whose two ends are closed in each case by a bottom (17, 18) shaped in a cross or the like, which comprise folded-in corners (19, 20) and folded-over bottom sides (21, 22) located opposite one another in pairs in each case, are folded inwards whilst carrying along at the end in each case a side tip (13) of the triangle of the adjacent folded-in corner (19, 20) and are bonded to one another and to the folded-in corners (19, 20), each side tip (13) of the triangle is provided with a material cutout (12) which starts from the inner cut edge (11) of the folded-in corner (19, 20) and exposes an adjacent region of the inside of the associated folded-over bottom side (21, 22), the exposed inside region being bonded to the outside of the folded-in corner (19, 20) in the region between the fold lines (7) of the bottom sides. <IMAGE>

Description

Die Erfindung betrifft einen mehrlagigen Ventilsack aus Papier, Kunststoffolie oder dergleichen faltbarem Material für insbesondere staubförmiges oder pulveriges Füllgut, dessen beide Enden durch je einen Kreuz- oder dergleichen Formboden geschlossen sind, die jeweils paarweise einander gegenüberliegende, von äußeren Diagonalfalzkanten und einer materiallagenbezogenen inneren Schnittkante begrenzte Eckeinschläge und Bodenseitenumschläge umfassen, die um in Bodenlängsrichtung verlaufende Bodenseitenfalzlinien unter endseitiger Mitnahme je eines seitlichen Dreieckzipfels des angrenzenden Eckeinschlags einwärts gefaltet und miteinander sowie mit den Eckeinschlägen verklebt sind.The invention relates to a multi-layer valve sack made of paper, plastic film or the like foldable material for in particular dusty or powdery filling material, the two ends of which are closed by a cross or similar shaped bottom, each of which is opposed in pairs and delimited by outer diagonal fold edges and a material-layer-related inner cut edge Include corner folds and bottom side envelopes which are folded inward about bottom side fold lines running in the longitudinal direction of the bottom, taking along one end of each triangular corner of the adjacent corner fold and glued to one another and to the corner folds.

Um die Dichtigkeit der Sackböden zu verbessern, ist es bei Ventilsäcken der angegebenen Art bekannt, einen sog. Innenriegel in den noch offenen Kreuzboden einzuarbeiten und diesen in Form eines geeigneten Materialzuschnitts mit der Innenseite der Bodenseitenumschläge und der Außenseite der Eckeinschläge rundum zu verkleben. Auf diese Weise wird eine Absperrung des Sackinnenraums erreicht, die verhindert, daß bei der üblichen Befüllung des Ventilsackes mit dem staubförmigen oder pulverigen Füllgut auf pneumatischen Füllanlagen unter dem während des Füllvorgangs im Sackinneren herrschenden Überdruck Füllgutanteile nach außen ausstauben oder in den Taschen übereinander liegender Materiallagen im Sackboden eingepreßt werden und sich dort festsetzen, mit der weiteren unerwünschten Folge, daß bei der späteren Entleerung des Sackes solche beispielsweise umweltbelastende Füllgutreste in der geleerten und zu entsorgenden Verpackung verbleiben. Dies gilt insbesondere für die sog. Dreiecktaschen, die die Bodenseitenumschläge mit den Dreieckzipfeln der Eckeinschläge durch Doppelwandigkeit in ihren seitlichen Enbereichen bilden.In order to improve the tightness of the sack bottoms, it is known for valve sacks of the specified type to incorporate a so-called inner bolt into the still open cross bottom and to glue it all around in the form of a suitable material cut to the inside of the bottom side envelopes and the outside of the corner inserts. In this way, a shut-off of the bag interior is achieved, which prevents that in the usual filling of the valve bag with the dusty or powdery filling material on pneumatic filling systems under the during Filling process inside the sack overpressure, dust the contents of the filling material outwards or be pressed into the pockets of layers of material lying on top of one another in the sack bottom and settle there, with the further undesirable consequence that when the sack is emptied later, such environmentally polluting filling residues remain in the emptied and to be disposed of packaging . This applies in particular to the so-called triangular pockets, which form the bottom side envelopes with the triangular corners of the corner inserts due to the double-walled walls in their side areas.

Die Absperrung des Sackinnenraums durch zusätzlich in die Kreuz- bzw. Formböden einzuarbeitende Innenriegel ist jedoch mit einem erhöhten maschinellen und arbeitstechnischen Aufwand und insbesondere auch mit einem bei Massenartikeln der hier in Rede stehenden Art ins Gewicht fallenden größeren Materialverbrauch verbunden.The blocking of the sack interior by means of additional internal bars to be incorporated into the cross or shaped bottoms, however, is associated with increased mechanical and technical expenditure and, in particular, also with a greater material consumption, which is significant in the case of mass articles of the type in question.

US-A-1903286 beschreibt einen Ventilsack gemäß dem Oberbegriff des Anspruchs 1 in einer einlagigen Ausführung des Sackes.US-A-1903286 describes a valve sack according to the preamble of claim 1 in a single-layer version of the sack.

Der Erfindung liegt die Aufgabe zugrunde, einen mehrlagigen Ventilsack der eingangs angegebenen Art zu schaffen, der unter Verzicht auf Innenriegel und dergleichen zusätzliche Maßnahmen ein hohes Maß an Dichtigkeit seiner Sackböden besitzt und bei dem insbesondere ein Eindringen von Füllgutteilen in durch die Bodenkonstruktion bedingte Materialtaschen verhindert ist.The invention has for its object to provide a multi-layer valve bag of the type mentioned, which has a high degree of tightness of its bag bottoms without the use of internal bolts and the like, and in particular prevents the penetration of filling parts into material pockets caused by the bottom construction .

Diese Aufgabe wird nach der Erfindung durch eine Ausgestaltung des Sackes gemäß dem kennzeichnenden Teil des Anspruchs 1 gelöst.This object is achieved according to the invention by an embodiment of the sack according to the characterizing part of claim 1.

Bei dieser Ausgestaltung sind die mit den Bodenseitenumschlägen zum Schließen des Kreuzbodens einwärts gefalteten Dreieckzipfel der Eckeinschläge, die durch Doppelwandigkeit Dreiecktaschen mit den Bodenseitenumschlägen bilden, durch den durch ihren Materialausschnitt ermöglichten Klebstoffauftrag auf der Innenseite der Bodenseitenumschläge und Verklebung mit der Außenseite des Eckeinschlags in ihrem verbleibenden Bereich gegenüber dem Sackinnenraum abgesperrt, so daß in diesem Restbereich die Dreiecktaschen gegenüber einem Eindringen von Füllgut aus dem Sackinneren abgesperrt sind. Dadurch ist ein Eindringen und Festsetzen selbst geringer Mengen des Füllguts in den Dreiecktaschen vermieden, wie es für eine spätere vollständige Entleerung des Sackes vom Füllgut erwünscht ist, und es ist außerdem ein hohes Maß an Dichtigkeit des Bodens durch die direkte, durchgehende Verklebung der Innenseite der Bodenseitenumschläge mit den Eckeinschlägen zwischen den Bodenseitenfalzlinien erreicht.In this embodiment, the are with the bottom side envelopes to close the bottom of the cross folded inward triangular corner of the corner inserts, which form triangular pockets with the bottom side envelopes due to the double-walled material, thanks to the adhesive application made possible by their material cut-out on the inside of the bottom side envelopes and bonding to the outside of the corner insert in their remaining area against the sack interior, so that in this remaining area, the triangular pockets are blocked against the ingress of filling material from the inside of the bag. This prevents penetration and setting of even small amounts of the filling material in the triangular pockets, as is desired for a later complete emptying of the sack from the filling material, and it is also a high degree of tightness of the bottom through the direct, continuous gluing of the inside of the Bottom side envelopes reached with the corner folds between the bottom side fold lines.

Die Merkmale und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachstehenden Beschreibung in Verbindung mit der Zeichnung, in der zwei Ausführungsbeispiele des Gegenstands der Erfindung schematisch veranschaulicht sind. In der Zeichnung zeigen:

Fig. 1
eine Ansicht eines flachliegenden Materialbahnabschnitts als Ausgangswerkstück für einen einlagigen Ventilsack nach einem ersten Ausführungsbeispiel der Erfindung,
Fig. 2
eine Ansicht eines von dem Materialbahnabschnitt gemäß Fig. 1 gebildeten Schlauchabschnitts,
Fig. 3
eine Ansicht eines flachliegenden Materialbahnzuschnitts als Ausgangswerkstück eines mehrlagigen Ventilsackes gemäß einem weiteren Ausführungsbeispiel der Erfindung,
Fig. 4
eine Ansicht eines von dem Materialbahnabschnitt gemäß Fig. 3 gebildeten Sackschlauchabschnitts,
Fig. 5
eine Ansicht des Schlauchabschnitts gemäß Fig. 4 mit jeweils zu einem offenen Kreuzboden aufgezogenen Schlauchenden und
Fig. 6
den Schlauchabschnitt gemäß Fig. 5 als fertigen Ventilsack mit geschlossenen Kreuzböden.
The features and advantages of the invention emerge from the claims and the following description in conjunction with the drawing, in which two exemplary embodiments of the object of the invention are illustrated schematically. The drawing shows:
Fig. 1
1 shows a view of a flat material web section as a starting workpiece for a single-layer valve bag according to a first exemplary embodiment of the invention,
Fig. 2
1 shows a view of a hose section formed by the material web section according to FIG. 1,
Fig. 3
1 shows a view of a flat material blank as the starting workpiece of a multi-layer valve bag according to a further exemplary embodiment of the invention,
Fig. 4
3 shows a view of a bag tube section formed by the material web section according to FIG. 3,
Fig. 5
a view of the hose section according to FIG. 4, each with drawn hose ends to an open cross bottom and
Fig. 6
5 as a finished valve bag with closed cross bottoms.

Bei dem in den Fig. 1 und 2 der Zeichnung veranschaulichten Ausführungsbeispiel ist ein einlagiger Materialbahn- bzw. Schlauchabschnitt aus Papier als Ausgangswerkstück für einen einlagigen Ventilsack dargestellt, an dessen Stelle auch ein mehrlagiger Ventilsack aus zwei oder mehr Materiallagen treten kann, wie es die Fig. 3 bis 6 anhand einer dreilagigen Ausführungsform veranschaulichen. Anstelle von beispielsweise insgesamt aus Papier bestehenden Materiallagen können auch Papier umfassende Materiallagen, z. B. mit Kunststoff- und/oder Metallfolien als Sperrschicht kaschiertes Papier, oder Sperrschicht-Zwischenlagen aus Metall-, Kunststoffolien und dergleichen Materialien verwendet werden. Ferner kommen Kunststoffolien allein als Sackmaterial ebenfalls in Betracht. Bei einer Herstellung der Kreuz- oder dergleichen Formböden der dargestellten Ventilsäcke durch Materialverklebung kommen bevorzugt die aus Papier bestehenden Materialseiten oder -lagen zum Einsatz, die die Verwendung von bei der Papiersackherstellung üblichen Klebstoffen auf Stärkebasis gestatten, während bei der Verarbeitung von Kunststoffolien oder Kunststoffschichten umfassendem Sackmaterial an deren Stelle bevorzugt auch heiße Schmelzklebstoffe bzw. Hotmelts treten können.In the embodiment illustrated in FIGS. 1 and 2 of the drawing, a single-layer material web or hose section made of paper is shown as the starting workpiece for a single-layer valve sack, in its place a multi-layer valve sack made of two or more layers of material can also take the place, as shown in FIG 3 to 6 illustrate using a three-layer embodiment. Instead of material layers consisting entirely of paper, for example, material layers comprising paper, e.g. B. with plastic and / or metal foils laminated paper as a barrier layer, or barrier layer interlayers made of metal, plastic films and the like materials can be used. Furthermore, plastic films alone are also considered as sack material. In the production of the cross or similar shaped bottoms of the valve bags shown by material gluing, the material sides or layers consisting of paper are preferably used, which allow the use of starch-based adhesives customary in paper bag production, while bag material comprising plastic films or plastic layers is used in the processing hot melt adhesives or hot melts can also be used in their place.

Der in Fig. 1 dargestellte flachliegende Materialbahnabschnitt 1 besteht beispielsweise aus einer einzigen Papierlage und bildet im Fertigungsprozeß Teil einer zusammenhängenden Materialbahn, die im Zuge ihrer Bearbeitung unter Überlappung ihrer Längsränder 2 und 3 mittels einer Längsnaht 4 (Fig. 2) zu einer Schlauchbahn geformt, von der einzelne Sackschlauchabschnitte 5 als Ausgangswerkstück für den herzustellenden Ventilsack abgetrennt und für die Bodenbildung an den beiden Enden des Schlauchabschnitts 5 mit den entsprechenden Falzlinien versehen werden, die in den Fig. 1 und 2 strichpunktiert dargestellt sind.The flat-lying material web section 1 shown in FIG. 1 consists, for example, of a single paper layer and forms part of a coherent material web in the manufacturing process, formed in the course of their processing with overlap of their longitudinal edges 2 and 3 by means of a longitudinal seam 4 (FIG. 2) to form a tubular web, from which the individual bag tube sections 5 are separated as the starting workpiece for the valve bag to be produced and for the bottom formation at the two ends of the tube section 5 the corresponding fold lines are provided, which are shown in phantom in FIGS. 1 and 2.

Strichpunktiert dargestellt in den Fig. 1 und 2 ist ferner die mit 6 bezeichnete Längsmittellinie des fertigen Ventilsackes. Die zur Herstellung je eines Kreuzbodens an den beiden Sackenden Anwendungen findenden, in Bodenlängsrichtung verlaufenden Bodenseitenfalzlinien sind mit 7 bezeichnet, während die Bodenmittenfalzlinien mit 8 bezeichnet sind. Die Diagonalfalzkanten der zu bildenden Eckeinschläge des jeweiligen Kreuzbodens tragen die Bezugszahl 9. Schließlich sind die zu bildenden Schlauchseitenkanten, in Fig. 1 strichpunktiert als Falzlinie angedeutet, mit 10 bezeichnet.1 and 2 is the longitudinal center line of the finished valve bag, designated by 6. The bottom side fold lines which are used to produce a cross bottom on the two sack ends and which run in the longitudinal direction of the bottom are denoted by 7, while the bottom center fold lines are denoted by 8. The diagonal fold edges of the corner folds of the respective cross base to be formed have the reference number 9. Finally, the hose side edges to be formed, indicated by dash-dotted lines in FIG. 1 as fold lines, are designated by 10.

Der Materialbahnabschnitt 1 bzw. Sackschlauchabschnitt 5 besitzt an seinen beiden Enden je eine gerade Schnittkante 11. Von jeder Schnittkante 11 gehen paarweise jedem der zu bildenden Eckeinschläge eines Kreuzbodens zugeordnete Materialausschnitte 12 aus, die im fertigen Kreuzboden am Innenrand je eines seitlichen Dreieckzipfels 13 liegen, die als Teil der Bodenseitenumschläge des Kreuzbodens, um diesen zu schließen, einwärtsgefaltet und miteinander sowie mit den Eckeinschlägen verklebt werden. Dies wird im einzelnen in Verbindung mit den Fig. 5 und 6 des weiteren Ausführungsbeispiels beschrieben, dessen Fig. 3 und 4 den Fig. 1 und 2 des ersten Ausführungsbeispiels entsprechen.The material web section 1 or sack tube section 5 has a straight cut edge 11 at each of its two ends. From each cut edge 11, pairs of material cutouts 12 originate from each of the corner folds to be formed in a cross base, which are located in the finished cross base on the inner edge of a lateral triangular tip 13 each as part of the bottom side envelopes of the cross base to close it, folded inwards and glued to one another and to the corner folds. This is described in detail in connection with FIGS. 5 and 6 of the further exemplary embodiment, the FIGS. 3 and 4 of which correspond to FIGS. 1 and 2 of the first exemplary embodiment.

Die Fig. 3 und 4 veranschaulichen einen Materialbahnabschnitt 1' bzw. einen Sackschlauchabschnitt 5', der aus drei Materiallagen 14, 15 und 16, z. B. aus Papier, besteht, von denen die Materialbahn 14 die Innenlage, die Materialbahn 15 die Zwischenlage und die Materialbahn 16 die Außenlage bildet. Die Materiallagen 14, 15 und 16 besitzen in an sich bekannter Weise den bei der Herstellung mehrlagiger Säcke aus verklebungstechnischen Gründen üblichen wechselweisen Versatz zueinander sowohl an ihren Längsrändern 2 und 3 zur Herstellung der sackschlauchbildenden Längsnaht 4 als auch an ihren beiden von den Trenn- bzw. Schnittkanten 11 definierten Enden. Im Bereich der Materialausschnitte 12 sind die Materiallagen 14, 15 und 16 jedoch von einer Staffelung zueinander freigehalten, so daß jeder Materialausschnitt 12 sämtliche Materiallagen 14, 15 und 16 in übereinstimmender gleicher Größe erfaßt. Der Materialausschnitt 12 geht dabei in seiner Tiefe, d. h. in Richtung der Längsmittelachse 6 des Sackschlauchs 5', bis auf die Höhe der Trennkante 11 der Zwischenlage 15. Dies bedeutet, daß die Trennkante 11 der Materiallagen 14, 15 und 16 in diesem Bereich ursprünglich auf gleicher Höhe liegt. Dies ermöglicht ein verschnittfreies Arbeiten. Im übrigen entspricht dieses Ausführungsbeispiel dem anhand der Fig. 1 und 2 erläuterten, wie es durch die Verwendung gleicher Bezugszeichen für gleiche bzw. übereinstimmende Teile bei beiden Ausführungsbeispielen kenntlich gemacht ist.3 and 4 illustrate a material web section 1 'and a bag hose section 5', which consists of three layers of material 14, 15 and 16, z. B. of paper, of which the material web 14 forms the inner layer, the material web 15 the intermediate layer and the material web 16 forms the outer layer. The material layers 14, 15 and 16 have the in a manner known per se in the production of multi-layer sacks, for reasons of adhesive bonding, the alternating offset between them is common, both at their longitudinal edges 2 and 3 for producing the sack tube-forming longitudinal seam 4 and at their two ends defined by the separating or cutting edges 11. In the area of the material cutouts 12, however, the material layers 14, 15 and 16 are kept free from staggering with respect to one another, so that each material cutout 12 covers all the material layers 14, 15 and 16 in the same size. The material cutout 12 extends in depth, ie in the direction of the longitudinal central axis 6 of the bag hose 5 ', to the height of the separating edge 11 of the intermediate layer 15. This means that the separating edge 11 of the material layers 14, 15 and 16 originally opened in this area same height. This enables waste-free work. Otherwise, this exemplary embodiment corresponds to that explained with reference to FIGS. 1 and 2, as is indicated by the use of the same reference symbols for identical or matching parts in both exemplary embodiments.

Die Fig. 5 zeigt einen Momentanzustand der Herstellung eines mehrlagigen Kreuzbodenventilsackes mit dem Sackschlauchabschnitt 5' gemäß Fig. 4 als Ausgangswerkstück, bei dem die beiden Enden jeweils zu einem offenen Kreuzboden 17 bzw. 18 aufgezogen und in für den Herstellungsprozeß typischer Weise parallel zum Hauptteil des Schlauchabschnitts 15' flachgelegt sind. Es sind dabei in jedem Kreuzboden 17, 18 paarweise einander gegenüberliegende Eckeinschläge 19 und 20 und ihrerseits paarweise einander gegenüberliegende Bodenseitenumschläge 21 und 22 entstanden. Die Eckeinschläge 19 und 20 sind jeweils von den äußeren Diagonalfalzkanten 9 und der inneren Schnittkante 11 der Materiallagen 14, 15 und 16 begrenzt. Die Bodenseitenumschläge sind ihrerseits in ihrem mittleren Bereich außen von der jeweiligen Schnittkante 11 der Materiallagen 14, 15 und 16 begrenzt und innenseitig von den Bodenseitenfalzlinien 7, um die sie zum Schließen des Kreuzbodens 17 bzw. 18 nach innen gefaltet werden. Dabei umfassen die Bodenseitenumschläge 21 und 22 endseitig die seitlichen Dreieckzipfel 13, die als Teil der Bodenseitenumschläge 21 und 22 von diesen beim Einwärtsfalten um die Bodenseitenfalzlinien 7 mitgenommen werden und auf den Eckeinschlägen 19 und 20 zu liegen kommen. In der für mehrlagige Kreuzbodenstaffelsäcke üblichen Weise sind im offenen Kreuzboden 17 die Eckeinschläge 19 und 20 positiv gestaffelt, während sie im Kreuzboden 18 negativ gestaffelt sind. In gleicher Weise ist im offenen Kreuzboden 17 der Bodenseitenumschlag 21 negativ und der Bodenseitenumgschlag 22 positiv gestaffelt, während im offenen Kreuzboden 18 der Bodenseitenumschlag 21 positiv und der Bodenseitenumschlag 22 negativ gestaffelt ist.Fig. 5 shows an instantaneous state of manufacture of a multi-layer cross bottom valve sack with the bag hose section 5 'according to Fig. 4 as a starting workpiece, in which the two ends are each drawn to an open cross bottom 17 and 18 and in a manner typical of the manufacturing process parallel to the main part of the Hose section 15 'are laid flat. In this way, in each cross base 17, 18 corner inserts 19 and 20 opposed to one another in pairs and bottom side envelopes 21 and 22 opposed to one another in pairs were created. The corner turns 19 and 20 are each delimited by the outer diagonal fold edges 9 and the inner cut edge 11 of the material layers 14, 15 and 16. The bottom side envelopes are in turn delimited in their central region on the outside by the respective cutting edge 11 of the material layers 14, 15 and 16 and on the inside by the bottom side fold lines 7, by which they are folded inwards to close the cross bottom 17 and 18, respectively. In this case, the bottom side envelopes 21 and 22 at the ends comprise the lateral triangular tips 13, which are part of the bottom side envelopes 21 and 22 of these when folding inwards around the bottom side fold lines 7 are carried and come to rest on the corner folds 19 and 20. In the manner customary for multi-layer cross-bottom sacks, the corner folds 19 and 20 are staggered positively in the open cross-bottom 17, while they are staggered negatively in the cross bottom 18. In the same way, in the open cross bottom 17, the bottom-side cover 21 is negative and the bottom-side cover 22 is staggered, while in the open cross-bottom 18, the bottom-side cover 21 is positive and the bottom-side cover 22 is staggered.

Der Materialausschnitt 12 an jedem seitlichen Dreieckzipfel 13 verläuft quer zur Bodenmittenfalzlinie 8 im Bereich zwischen seiner Bodenseitenfalzlinie 7 und seiner Diagonalfalzkante 9 und legt auf diese Weise einen angrenzenden Bereich der Innenseite des zugehörigen Bodenseitenumschlags 21 bzw. 22 frei.The material cutout 12 on each lateral triangular tip 13 runs transversely to the bottom center fold line 8 in the area between its bottom side fold line 7 and its diagonal fold edge 9 and in this way exposes an adjacent area of the inside of the associated bottom side envelope 21 or 22.

Zum Schließen der Kreuzböden 17 und 18 werden diese mit Klebstofaufträgen 23 und 24 auf den Eckeinschlägen 19 und 20 sowie den Bodenseitenumschlägen 21 und 22 versehen. Die durch einfache Schrägschraffur kenntlich gemachten Klebstoffaufträge 23 befinden sich auf der Außenseite der Eckeinschläge 19, 20 in dem Bereich der Dreieckzipfel 13, der nicht von dem Materialausschnitt 12 erfaßt ist. Die durch Kreuzschraffur kenntlich gemachten Klebstoffaufträge 24 befinden sich demgegenüber auf der Innenseite der Bodenseitenumschläge 21 und 22. Insbesondere befinden sich dabei die Klebstoffaufträge 24 auf jedem Bodenseitenumschlag 21 und 22 in dem Bereich, der durch die Materialausschnitte 12 in den Dreieckzipfeln 13 der Eckeinschläge 19 und 20 freigelegt ist.To close the cross bottoms 17 and 18, they are provided with adhesive layers 23 and 24 on the corner inserts 19 and 20 and the bottom side envelopes 21 and 22. The adhesive applications 23, identified by simple oblique hatching, are located on the outside of the corner inserts 19, 20 in the area of the triangular tips 13, which is not covered by the material cutout 12. In contrast, the adhesive layers 24 identified by cross hatching are located on the inside of the bottom side envelopes 21 and 22. In particular, the adhesive layers 24 are located on each bottom side envelope 21 and 22 in the area that is identified by the material cutouts 12 in the triangular corners 13 of the corner corners 19 and 20 is exposed.

Beim Schließen der Kreuzböden 17 und 18 durch Einwärtsfalten der Bodenseitenumschläge 21 und 22, und zwar zuerst des Bodenseitenumschlags 21 des Kreuzbodens 17 und des Bodenseitenum - schlags 22 des Kreuzbodens 18, die jeweils in dem offenen Kreuzboden gem. Fig. 5 die negative Lagenstaffelung aufweisen, erfolgt mittels der Klebstoffaufträge 23 und 24 die Verklebung der Bodenseitenumschläge 21 und 22 miteinander sowie mit den Eckeinschlägen 19 und 20 im Bereich zwischen den Bodenseitenfalzlinien 7. Insbesondere erfolgt dabei in diesem Bereich auch jeweils eine Verklebung der durch die Materialausschnitte 12 freigelegten Bereiche der Innenseite der Bodenseitenumschläge 21 und 22 mit der Außenseite des jeweiligen Eckeinschlags 19, 20. Die hier mittels des Klebstoffauftrags 24 jeweils gebildete Verbindungsfläche schließt zum Sackinneren hin die Schnittkanten des ausschnittfrei verbliebenen Teils des jeweiligen Dreieckzipfels 13 ab, so daß die von den Dreieckzipfeln 13 mit dem jeweils angrenzenden Bodenseitenumschlag 21, 22 gebildeten, nach außen jeweils durch die Falzkanten 7 und 9 geschlossenen Dreiecktaschen für das Füllgut nicht zugänglich sind.When closing the cross bottoms 17 and 18 by folding in the bottom side envelopes 21 and 22, first of all the bottom side envelope 21 of the cross bottom 17 and the bottom side envelope 22 of the cross bottom 18, each in the open cross bottom according to 5 have the negative layer grading, the adhesive is applied to the bottom side envelopes 21 and 22 to one another and to the adhesive layers 23 and 24 Corner folds 19 and 20 in the area between the bottom side fold lines 7. In particular, the areas of the inside of the bottom side envelopes 21 and 22 exposed by the material cutouts 12 are glued in this area to the outside of the respective corner folds 19, 20. This is done here by means of the adhesive application 24 each connecting surface formed closes to the inside of the sack the cut edges of the part of the respective triangle 13 which remains free of cutouts, so that the triangular pockets formed by the triangle 13 with the respectively adjacent bottom side envelope 21, 22 and which are closed to the outside by the folded edges 7 and 9 Fill goods are not accessible.

Mittels der Klebstoffaufträge 23 wird im übrigen eine dichte Verklebung des von dem Materialausschnitt 12 freigehaltenen Bereichs jedes Dreieckzipfels 13 mit der Außenseite des jeweiligen Eckeinschlags 19 bzw. 20 erreicht. Der fertiggestellte Kreuzbodenventilsack mit geschlossenen Kreuzböden 17 und 18 ist aus Fig. 6 ersichtlich, wobei hier im Kreuzboden 18 strichpunktiert bei 25 eine Ventileinlage veranschaulicht ist, die vor dem Schließen des Kreuzbodens 18 in diesen im Zuge der Herstellung eingearbeitet worden ist.By means of the adhesive applications 23, moreover, a dense bonding of the area of each triangular triangle 13 which is kept free from the material cutout 12 to the outside of the respective corner fold 19 or 20 is achieved. The finished cross bottom valve sack with closed cross bottoms 17 and 18 can be seen from FIG. 6, wherein here in cross bottom 18 with a dash-dot line at 25 a valve insert is illustrated, which was incorporated into the cross bottom 18 in the course of its manufacture before it was closed.

Die Herstellungsschritte zur Bildung eines einlagigen Kreuzbodenventilsackes sind, ausgehend von dem Sackschlauchabschnitt 5 gem. Fig. 2, analog den anhand der Fig. 5 und 6 beschriebenen Bearbeitungsschritten eines mehrlagigen Kreuzbodenventilsackes. In beiden Fällen sind die Materialausschnitte 12 von rechtwinklig zueinander verlaufenden Schnittlinien begrenzt. Es entsteht hierbei jeweils ein sich an die äußere, in die Diagonalfalzkante 9 einmündende Schnittlinie nach außen anschließender dreieckiger Materiallappen 26, der nach außen in die Ebene des jeweiligen Bodenseitenumschlags 21 bzw. 22 umgeklappt und in dessen für die Verklebung durch den Materialausschnitt 12 freigelegten Innenbereich einbezogen ist. Grundsätzlich ist es auch möglich, nur eine Schnittlinie entsprechend der Ausschnittiefe, vorzugsweise entsprechend dem Lagenstaffelungsmaß, parallel zur Bodenseitenfalzlinie 7 zu führen und die quer dazu verlaufende Schnittlinie schräg nach außen und in Richtung auf die Sackmittellinie 6 zu führen und in der Schnittkante 11 des zugehörigen Bodenseitenumschlags 21 bzw. 22 auslaufen zu lassen, wodurch die Materiallappen 26 entfallen.The manufacturing steps for forming a single-ply cross-bottom valve sack are based on the bag hose section 5 according to FIG. Fig. 2, analogous to the processing steps described with reference to FIGS. 5 and 6 of a multi-layer cross bottom valve bag. In both cases, the material cutouts 12 are delimited by cutting lines running at right angles to one another. This results in a triangular material flap 26 which adjoins the outer cut line which opens into the diagonal fold edge 9 and which folds outwards into the plane of the respective bottom-side envelope 21 or 22 and includes it in the inner region exposed for the gluing by the material cutout 12 is. In principle, it is also possible to make only one cut line parallel to the bottom side fold line 7 according to the cutout depth, preferably according to the layer grading dimension, and the crosswise for this purpose, the cutting line running obliquely outwards and in the direction of the sack center line 6 and allowing it to run out in the cutting edge 11 of the associated bottom-side envelope 21 or 22, as a result of which the material tabs 26 are omitted.

Ferner ist es möglich, den Materialausschnitt 12 an seinem inneren, an die Bodenseitenfalzlinie 7 angrenzenden Ende und an seinem äußeren, an die Außenkante des Bodenseitenumschlags 21 bzw. 22 angrenzenden Ende in einem Radius auslaufen zu lassen oder den Materialausschnitt 12 insgesamt bogenförmig auszuführen, etwa durch Ausstanzung mit einer Kreis- oder Ellipsenform und Halbierung durch die jeweilige Schnittkante 11 des Sackschlauchs 5 bzw. 5'. Eine derartige Stanzform bietet sich besonders als Variante bei Kunststoffsäcken an.Furthermore, it is possible to let the material cutout 12 run out in a radius at its inner end adjoining the bottom side fold line 7 and at its outer end adjoining the outer edge of the bottom side cover 21 or 22, or to make the material cutout 12 as an arc overall, for example by Punching out with a circular or elliptical shape and halving through the respective cut edge 11 of the bag hose 5 or 5 '. Such a die is particularly suitable as a variant for plastic bags.

Die Herstellung der Materialausschnitte 12 erfolgt im übrigen bei dem Ausführungsbeispiel eines mehrlagigen Sackes in der in solchen Fällen bei der Herstellung von Staffelschnitten üblichen Weise mittels geeigneter Perforationsmeser nach Art von Ausstanzungen, wobei die einzelnen Sackschlauchabschnitte 5' am Ende der Schlauchziehmaschine entlang den erzeugten Perforationslinien abgerissen werden, oder es werden bei der Herstellung eines Glatt- oder Geradschnittsackes etwa gemäß dem einlagigen Sackschlauchabschnitt 5 gemäß Fig. 2 mit entsprechenden Schneidwerkzeugen die erforderlichen Materialausschnitte 12 im Anschluß an die Bildung einzelner Sackschlauchabschnitte 5, etwa in der Bodenlegemaschine, hergestellt oder auch schon in der Flachbahn ausgeschnitten.In the exemplary embodiment of a multi-layer sack, the material cutouts 12 are produced in the manner customary in such cases for the production of staggered cuts by means of suitable perforation knives in the manner of punched-outs, the individual sack tube sections 5 'being torn off at the end of the tube drawing machine along the perforation lines generated , or in the manufacture of a smooth or straight-cut sack, for example according to the single-layer sack hose section 5 according to FIG. 2, with appropriate cutting tools, the necessary material cutouts 12 are made following the formation of individual sack hose sections 5, for example in the floor-laying machine, or even in the flat web cut out.

Claims (6)

  1. A valve bag consisting of paper, synthetic plastics film or the like foldable material, particularly for powdered or dust-like contents and of which the two ends are each closed by a satchel-type or similar shaped bottom (17, 18) which in each case comprise pairwisely opposite corner gussets (19, 20) bounded by outer diagonal fold edges (9) and an - in terms of layers of material - inner cut edge (11) and bottom lateral flaps (21, 22) which are folded inwardly about bottom lateral fold lines (7) extending in the longitudinal direction of the bottom and each taking in at the end a lateral triangle tip (13) of the adjacent corner gusset (19, 20) and are glued to one another and to the corner gussets (19, 20), whereby each lateral triangle tip (13) is in the region between its bottom lateral fold line (7) and its diagonal fold edge (9) provided with, starting from the inner cut edge (11) of the corner gusset (19, 20) and exposing an adjacent part of the inside of the associated bottom lateral flap (21, 22), a material cut-out (12) while the exposed part of the inside is, by means of an application of glue (24), glued to the outside of the corner gusset (19, 20) in the area between the bottom lateral fold lines (7), characterised in that in a multi-ply version of the bag with an arrangement of individual layers of material (14, 15, 16) staggered in the longitudinal direction of the bag, the layers of material (14, 15, 16) are in the region of the material cut-outs (12) maintained free from such staggering, each material cut-out (12) embracing all the layers of material (14, 15, 16) of concordantly the same size.
  2. A valve bag according to Claim 1, characterised in that, measured in the direction of the longitudinal central line (6), the cut-out depth of the material cut-outs (12) corresponds to the amount of offset of the layers of material (14, 15, 16) which are staggered in respect of one another.
  3. A valve bag according to Claim 1 or 2, characterised in that the material cut-out (12) is bounded by cutting lines which extend at right-angles to one another.
  4. A valve bag according to Claim 1 or 2, characterised in that the material blank (12) is of arcuate construction.
  5. A valve bag according to one of Claims 1 to 4, characterised in that a triangular tongue (25) of the material which is outwardly adjacent the outer cutting line which ends in the diagonal fold edge (9) is folded over outwardly into the plane of the bottom lateral flap (21, 22) and is incorporated into its inner zone which is exposed for gluing purposes.
  6. A valve bag according to one of Claims 1 to 5, characterised in that also that area of each triangle tip (13) which is kept exposed by the material cut-out (12) is in the area between the two bottom lateral fold lines (7) glued to the outside of each corner gusset (19, 20) by means of an application of glue (23) to its outer surface.
EP92109513A 1991-07-31 1992-06-05 Multi-layered valve bag Expired - Lifetime EP0525337B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9109467U 1991-07-31
DE9109467U DE9109467U1 (en) 1991-07-31 1991-07-31 Single or multi-layer valve bag

Publications (2)

Publication Number Publication Date
EP0525337A1 EP0525337A1 (en) 1993-02-03
EP0525337B1 true EP0525337B1 (en) 1995-11-08

Family

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Application Number Title Priority Date Filing Date
EP92109513A Expired - Lifetime EP0525337B1 (en) 1991-07-31 1992-06-05 Multi-layered valve bag

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EP (1) EP0525337B1 (en)
AT (1) ATE129975T1 (en)
DE (2) DE9109467U1 (en)
ES (1) ES2080374T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19840792C2 (en) * 1998-09-08 2003-04-24 Chronos Richardson Gmbh bag
US8142077B2 (en) 2008-04-16 2012-03-27 Graphic Packaging International, Inc. Bag structures and methods of assembling the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066851B (en) * 1959-10-08 Erwin Behn Verpackungsbedarf G.m.b.H., Krefeld Method and device for the production of multi-layer cross-bottom valve bags from paper or similar material
US1903286A (en) * 1930-08-05 1933-04-04 Coty Thomas Earl Bag and method of forming the same
US1971625A (en) * 1934-01-22 1934-08-28 Crown Willamette Paper Company Siftproof bottom in paper bags
DE669835C (en) * 1936-04-15 1939-01-05 Edgar Hoppe Multi-walled sack made of paper or other materials
AT191319B (en) * 1955-10-08 1957-08-26 Bowaters Dev & Res Ltd Multilayer valve paper sack
FR1171387A (en) * 1956-01-09 1959-01-26 Goodrich Co B F Polymeric monomer materials based on polyoxyalkylene glycol and polymers obtained from these materials
US3248042A (en) * 1962-12-26 1966-04-26 Union Carbide Corp Thermoplastic bag
DE7903809U1 (en) * 1979-02-12 1979-05-17 Derndruck Dr Phil Wilhelm Dern Folding packaging
GB2171390B (en) * 1985-02-02 1989-03-01 Bischof & Klein Flexible packaging container for loose filling material

Also Published As

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ES2080374T3 (en) 1996-02-01
ATE129975T1 (en) 1995-11-15
DE59204238D1 (en) 1995-12-14
EP0525337A1 (en) 1993-02-03
DE9109467U1 (en) 1991-09-19

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