EP0264519B1 - Cross or block bottom valve bag - Google Patents

Cross or block bottom valve bag Download PDF

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Publication number
EP0264519B1
EP0264519B1 EP87100088A EP87100088A EP0264519B1 EP 0264519 B1 EP0264519 B1 EP 0264519B1 EP 87100088 A EP87100088 A EP 87100088A EP 87100088 A EP87100088 A EP 87100088A EP 0264519 B1 EP0264519 B1 EP 0264519B1
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EP
European Patent Office
Prior art keywords
bag
valve
lip
valve tube
interior
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
Application number
EP87100088A
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German (de)
French (fr)
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EP0264519A2 (en
EP0264519A3 (en
Inventor
Alois Gröner
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Bischof and Klein SE and Co KG
Original Assignee
Bischof and Klein SE and Co KG
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Filing date
Publication date
Application filed by Bischof and Klein SE and Co KG filed Critical Bischof and Klein SE and Co KG
Priority to AT87100088T priority Critical patent/ATE63518T1/en
Publication of EP0264519A2 publication Critical patent/EP0264519A2/en
Publication of EP0264519A3 publication Critical patent/EP0264519A3/en
Application granted granted Critical
Publication of EP0264519B1 publication Critical patent/EP0264519B1/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
    • B65D31/14—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 cross or block bottom valve sack made of paper or the like.
  • Foldable material with a sack bottom incorporated into one of its two sack bottoms laterally delimited by bottom side fold lines in the area of a valve-forming corner wrap, which at its end facing the inside of the sack is flexible on one side by a shut-off lip Material of at least valve hose width is protruded, which can be moved automatically into a blocking position sealing the inner valve hose opening under the pressure of the filling material filled into the sack interior.
  • DE-U 8 534 301.1 describes a known cross or block bottom valve sack of this type, in which the filling valve with its valve tube is formed from a paper blank which is glued into the bottom of the sack over the valve-forming corner wrap. In the area between the bottom side fold lines of the sack bottom, there is no adhesive applied between the valve-forming corner fold and a lower cover part of the paper blank, so that the corner fold is freely spanned by the paper blank with a transverse dimension corresponding to the width of the bottom to form the valve tube.
  • the shut-off rib made of flexible material is formed on the top of the valve tube and is solely responsible for shutting off the inner opening of the valve tube under the pressure of the filled product when the filling process is complete.
  • valve hose with an inner layer which can be converted from a normally non-adhesive state for a tight closure of the valve hose into an adhesive or sealable state.
  • non-adhesive state of the inner layer of the valve hose such sacks can easily be pushed onto the filling nozzle of an automatic filling machine in order to be filled with pourable or pourable filling material.
  • the inner layer of the valve hose is to be converted into an adhesive state, so that the valve hose can be glued together flat under pressure and thus forms a dust-tight seal of the valve channel defined by the valve hose.
  • the inner layer of the valve hose can be designed as a thermoplastic inner coating on a paper layer forming the valve hose, wherein it is reactivated by supplying heat, for example by means of a hot air blower, i.e. H. can be converted into an adhesive or sealable state.
  • a hot air blower i.e. H.
  • valve channel closure cannot be properly carried out due to internal contamination of the valve hose with residues. This is primarily due to the fact that when the filled sack is ejected from the filling machine and when the sack is positioned in the device for closing the valve hose, small quantities of filling material can trickle out of the sack interior or get into the valve channel. Here they then prevent the two halves of the valve tube from flattening under pressure after the inner layer has been reactivated.
  • the invention has for its object to provide a cross or block bottom valve sack, in which the penetration of contents into the valve hose is safely avoided after the filling process, so one to be able to produce a proper, dust-tight closure of the valve hose by reactivating an inner layer.
  • this object is achieved according to the invention in that the filling valve is formed by a valve tube with an inner layer, which from a normally non-adhesive state for a tight closure of the valve tube into an adhesive or sealable Condition is transferable, and that the shut-off lip projecting over the valve hose on its underside toward the inside of the sack is itself overhanged by a separate sealing lip, which is formed by an end part of a sealing material blank that extends freely into the inside of the sack and that is wider than the bottom width, which is outside the bottom side fold lines lying partial areas is fixed at the edge by connection with the bottom side envelopes.
  • the shut-off rib can be formed by an end part which projects freely into the inside of the sack and has an insert sheet with a lower area on the valve-forming corner insert and in an upper area supporting the valve tube and having a width which exceeds the sack bottom width and which lies outside the bottom side fold lines lower sub-areas is fixed at the edge by connection with the bottom side envelopes.
  • the position of the shut-off lip like that of the sealing lip, is in relation to the opening of the valve hose opening into the interior of the sack defined, and there is a correspondingly predetermined movement of the shut-off and sealing lip against the inner valve hose opening under the pressure of the inserted filling material in order to prevent the filling material from trickling out.
  • shut-off lip and the sealing lip all suitable soft, pliable materials are considered, such as in particular plastic films, thin paper, nonwoven fabric and the like.
  • the sealing lip be made of a material that is more flexible than that of the shut-off lip, e.g. B. from a thin plastic film, then the shut-off lip is advantageously made of a somewhat stiffer material, eg. B. paper is formed.
  • the configuration according to the invention not only enables transverse dimensions of the valve tube corresponding to the base width, but also allows smaller transverse dimensions of the valve tube to be adapted without further ado to adapt the valve channel to the predetermined diameter of the filling nozzle of the automatic filling machines of the packaging company.
  • a three-layer cross-bottom valve sack made of paper is shown, in its place a cross-bottom valve sack made of one or two material layers or in an otherwise suitable number of layers can also occur.
  • material layers made entirely of paper paper-encompassing material layers, e.g. B. with plastic and / or metal foils laminated paper, or intermediate layers of metal, plastic foils and the like. Materials are used.
  • the material sides or layers consisting of paper are preferably used, which allow the use of starch-based adhesives customary in paper bag production.
  • a block bottom sack can be used instead of a cross bottom sack, which differs from a cross bottom sack by the inserted side folds and the rectangular bottoms already in the unfilled state of the sack.
  • Plastic films are also considered as the bag material alone.
  • FIG. 2 which shows the bottom of the cross in the still open, ie not yet finished, closed state
  • the bottom middle fold line is designated by 1
  • the two bottom side fold lines at 2 and 3 are each shown in dash-dot lines.
  • the two bottom envelopes of the open cross base are designated 4 and 5 and the two corner folds with 6 and 7.
  • the three material layers arranged concentrically to one another are designated 8, 9 and 10 and are staggered at the ends in a manner known per se, the material layers also being provided with incisions for extending the bottom side envelopes 4 and 5 in the longitudinal direction of the bottom.
  • the corner insert 7 is the valve-forming corner insert, onto which an insert sheet 12 made of paper is glued to produce a filling valve by means of an adhesive application 11 (FIG. 1).
  • the insert sheet 12 has an envelope with the fold edge 13 directed towards the outside of the bag, the lower envelope part 14 being glued onto the corner wrap 7 by means of the adhesive application 11.
  • the width of the insert sheet 12 exceeds the width of the finished sack bottom, which is defined by the transverse dimension between the bottom side fold lines 2 and 3.
  • the cover part 14 is connected to the bottom side envelopes 4 and 5 by adhesive layers 15 (FIG. 2) and thus fixed on the edge side.
  • valve tube 18 is glued by means of an adhesive application 17 (FIG. 1), the width or transverse dimension of which is smaller than the width of the sack bottom, as is particularly shown in FIG. 2 to 4 show.
  • the valve hose 18 consists of a paper layer which is formed into a hose by means of a longitudinal seam 19 and has an inner coating made of a thermoplastic material which is normally, i. H. is particularly ineffective at room temperature, but can be converted into an adhesive or sealable state by supplying hot air, in order to close the valve tube 18 flatly with a flat compression.
  • the width of the valve hose 18 is selected in accordance with the predetermined diameter of the filling nozzle of a filling machine.
  • the upper envelope part 16 extends beyond the inner edge 20 of the corner wrap 7 to the interior of the sack and also projects a short distance beyond the valve tube 18 at its end facing the interior of the sack Section of about 15 to 20 mm in length.
  • the valve tube 18 projecting toward the inside of the bag portion of the upper envelope part 16 forms a shut-off lip 21, which under the pressure of the filling material filled into the sack can be moved automatically into a blocking position sealing the inner opening of the valve tube 18.
  • a sealing lip 24 is provided which projects beyond the shut-off lip 21 towards the inside of the bag.
  • the sealing lip 24 is formed by an end part of a blank 25, for example plastic film, which projects freely into the sack interior and whose width exceeds the base width.
  • the blank 25 In its partial areas lying outside the bottom side fold lines 2 and 3, the blank 25 is glued to the bottom side envelopes 4 and 5 with the aid of adhesive applications 26 (FIG. 2) and thus, like the insert sheet 12, is fixed at the edge.
  • the blank 25 is loosely framed with its end part facing the bag, provided with an envelope, in the envelope of the insert sheet 12, ie there are no adhesive connections between the blank 25 and the insert sheet 12 in the area of the base width.
  • the upper or main part 27 of the blank 25 forms with the upper cover part 16 of the insert sheet 12 a pocket 28 which opens out towards the inside of the sack and which, like the pocket 22, can be widened by penetrating filling material in such a way that the contact movement of the shut-off lip 21 counteracts the inner valve hose opening is additionally supported.
  • the system movement is both the shut-off lip 21 and the sealing lip 24 against the inner valve hose opening.
  • FIG. 1 shows a bottom cover sheet 29 glued to the finished, closed cross bottom on the outside with an envelope 30 on the valve corner, which covers and reinforces the outside area of the valve and in particular of the valve hose 18.
  • FIG. 4 also shows a hot air blower 31 of a device for closing the filled sacks. From the mouthpiece 32 of the hot air blower 31, hot air jets are directed onto the inner coating of the slightly open valve hose 18 in order to convert its inner coating into the adhesive or sealable state, so that the inner valve channel defined by the valve hose 18 is closed in a dust-tight manner with the valve hose 18 compressed flat can be.

Abstract

A bag of foldable material has an end closure closing off one end of the bag and a filling valve tube device extends into the end closure at a corner of the bag, the filling valve tube device has an inner end disposed within the interior of the bag and has an inner layer which is convertable from a normally inactive adhesive state to a state capable of sealing off the filling valve tube device. A shut-off lip device of flexible material is disposed within the end closure and projects into the interior of the bag beyond the interior end of the filling valve tube device, the shut-off lip device being constructed to be responsive to the pressure of the filling material introduced into the interior of the bag to close off the interior opening of the filling valve tube device.

Description

Die Erfindung betrifft einen Kreuz- oder Klotzbodenventilsack aus Papier oder dgl. faltbarem Material, mit einem in einen seiner beiden seitlich von Bodenseitenfalzlinien begrenzten Sackböden im Bereich eines ventilbildenden Eckeinschlags eingearbeiteten Füllventil, das an seinem dem Sackinneren zugeandten Ende an einer Seite von einer Absperrlippe aus flexiblem Material von zumindest Ventilschlauchbreite überragt ist, die unter dem Druck des in das Sackinnere eingefüllten Füllguts selbsttätig in eine die innere Ventilschlauchöffnung abdichtende Sperrstellung bewegbar ist.The invention relates to a cross or block bottom valve sack made of paper or the like. Foldable material, with a sack bottom incorporated into one of its two sack bottoms laterally delimited by bottom side fold lines in the area of a valve-forming corner wrap, which at its end facing the inside of the sack is flexible on one side by a shut-off lip Material of at least valve hose width is protruded, which can be moved automatically into a blocking position sealing the inner valve hose opening under the pressure of the filling material filled into the sack interior.

DE-U 8 534 301.1 beschreibt einen bekannten Kreuz- oder Klotzbodenventilsack dieser Art, bei dem das Füllventil mit seiner Ventilröhre von einem Papierzuschnitt gebildet ist, der über dem ventilbildenden Eckeinschlag in den Sackboden eingeklebt ist. Im bereich zwischen den Bodenseitenfalzlinien des Sackbodens ist dabei keinerlei Klebstoffauftrag zwischen dem ventilbildenden Eckeinschlag und einem unteren Umschlagteil des Papierzuschnitts vorgesehen, so daß der Eckeinschlag mit einem der Eodenbreite entsprechenden Quermaß zur Ausbildung der Ventilröhre vom Papierzuschnitt frei überspannt ist. Die Absperrlippe aus flexiblem Material ist dabei an der Oberseite der Ventilröhre gebildet und allein für die Absperrung der inneren öffnung der Ventilröhre unter dem Druck des eingefüllten Füllguts bei Beendigung des Füllvorgangs verantwortlich.DE-U 8 534 301.1 describes a known cross or block bottom valve sack of this type, in which the filling valve with its valve tube is formed from a paper blank which is glued into the bottom of the sack over the valve-forming corner wrap. In the area between the bottom side fold lines of the sack bottom, there is no adhesive applied between the valve-forming corner fold and a lower cover part of the paper blank, so that the corner fold is freely spanned by the paper blank with a transverse dimension corresponding to the width of the bottom to form the valve tube. The shut-off rib made of flexible material is formed on the top of the valve tube and is solely responsible for shutting off the inner opening of the valve tube under the pressure of the filled product when the filling process is complete.

Sofern ein besonders dichter Verschluß des Ventilschlauchs bei Beendigung des Füllvorgangs vorgenommen werden soll, ist es wünschenswert, einen Ventilschlauch mit einer Innenschicht vorzusehen, die aus einem normalerweise klebunwirksmen Zustand für einen dichten Verschluß des Ventilschlauchs in einen klebe- oder siegelfähigen Zustand überführbar ist. Im klebunwirksamen Zustand der Innenschicht des Ventilschlauchs lassen sich solche Säcke ohne weiteres auf den Füllrüssel einer automatischen Füllmaschine aufschieben, um mit riesel- oder schüttfähigem Füllgut befüllt zu werden. Nach Beendigung des Füllvorgangs ist die Innenschicht des Ventilschlauchs in einen klebwirksamen Zustand zu überführen, so daß der Ventilschlauch unter Druckanwendung flach zusammengeklebt werden kann und so eine staubdichte Versiegelung des vom Ventilschlauch definierten Ventilkanals bildet. Die Innenschicht des Ventilschlauches kann dabei als thermoplastische Innenbeschichtung auf einer den Ventilschlauch bildenden Papierlage ausgeführt sein, wobei sie durch Wärmezufuhr beispielsweise mittels eines Heißluftgebläses reaktiviert, d. h. in einen klebe- bzw. siegelfähigen Zustand überführt werden kann.If a particularly tight closure of the valve hose is to be carried out when the filling process is complete, it is desirable to provide a valve hose with an inner layer which can be converted from a normally non-adhesive state for a tight closure of the valve hose into an adhesive or sealable state. In the non-adhesive state of the inner layer of the valve hose, such sacks can easily be pushed onto the filling nozzle of an automatic filling machine in order to be filled with pourable or pourable filling material. After completion of the filling process, the inner layer of the valve hose is to be converted into an adhesive state, so that the valve hose can be glued together flat under pressure and thus forms a dust-tight seal of the valve channel defined by the valve hose. The inner layer of the valve hose can be designed as a thermoplastic inner coating on a paper layer forming the valve hose, wherein it is reactivated by supplying heat, for example by means of a hot air blower, i.e. H. can be converted into an adhesive or sealable state.

Häufig zeigt sich jedoch,daß dieser Ventilkanalverschluß infolge innerer Verunreinigungen des Ventilschlauchs mit Füllgutresten nicht ordnungsgemäß durchgeführt werden kann. Dies ist vor allen Dingen darauf zurückzuführen, daß beim Abwurf des gefüllten Sackes von der Füllmaschine und beim Positionieren des Sackes in der Vorrichtung zum Verschließen des Ventilschlauchs geringe Füllgutmengen aus dem Sackinneren ausrieseln bzw. in den Ventilkanal gelangen können. Hier verhindern sie sodann eine vollflächige Verklebung oder Verschmelzung der beiden nach Reaktivierung der Innenschicht unter Druck flachgelegten Hälften des Ventilschlauchs.However, it is often found that this valve channel closure cannot be properly carried out due to internal contamination of the valve hose with residues. This is primarily due to the fact that when the filled sack is ejected from the filling machine and when the sack is positioned in the device for closing the valve hose, small quantities of filling material can trickle out of the sack interior or get into the valve channel. Here they then prevent the two halves of the valve tube from flattening under pressure after the inner layer has been reactivated.

Der Erfindung liegt die Aufgabe zugrunde, einen Kreuzoder Klotzbodenventilsack zu schaffen, bei dem das Eindringen von Füllgutteilen in den Ventilschlauch nach Beendigung des Füllvorgangs sicher vermieden ist, um so einen ordnungsgemäßen, staubdichten Verschluß des Ventilschlauchs durch Reaktivierung einer Innenschicht herstellen zu können.The invention has for its object to provide a cross or block bottom valve sack, in which the penetration of contents into the valve hose is safely avoided after the filling process, so one to be able to produce a proper, dust-tight closure of the valve hose by reactivating an inner layer.

Ausgehend von einem Kreuz- oder Klotzbodenventilsack der eingangs angegebenen Art wird diese Aufgabe nach der Erfindung dadurch gelöst, daß das Füllventil von einem Ventilschlauch mit einer Innenschicht gebildet ist, die aus einem normalerweise klebunwirksamen Zustand für einen dichten Verschluß des Ventilschlauches in einen klebe- oder siegelfähigen Zustand überführbar ist, und daß die den Ventilschlauch an seiner Unterseite überragende Absperrlippe zum Sackinneren hin ihrerseits von einer gesonderten Abdichtlippe überragt ist, die von einem frei in das Sackinnere ragenden Endteil eines Abdichtmaterialzuschnitts von die Bodenbreite übersteigender Breite gebildet ist, der in seinen außerhalb der Bodenseitenfalzlinien liegenden Teilbereichen durch Verbindung mit den Bodenseitenumschlägen randseitig fixiert ist.Starting from a cross or block bottom valve sack of the type specified at the outset, this object is achieved according to the invention in that the filling valve is formed by a valve tube with an inner layer, which from a normally non-adhesive state for a tight closure of the valve tube into an adhesive or sealable Condition is transferable, and that the shut-off lip projecting over the valve hose on its underside toward the inside of the sack is itself overhanged by a separate sealing lip, which is formed by an end part of a sealing material blank that extends freely into the inside of the sack and that is wider than the bottom width, which is outside the bottom side fold lines lying partial areas is fixed at the edge by connection with the bottom side envelopes.

Die nach der Erfindung zusätzlich zu der Absperrlippe vorgesehene gesonderte Abdichtlippe verschließt im Zusammenwirken mit der Absperrlippe den Ventilschlauch an seinem dem mit Füllgut befüllten Sackinneren zugewandten Ende zuverlässig vor einem Ausrieseln kleiner Füllgutmengen in einem solchen Umfang, daß der anschließende innenseitige Verschluß des Ventilschlauchs mittels seiner in den klebeoder siegelfähigen Zustand überführten Innenschicht nicht beeinträchtigt wird.The separate sealing lip provided according to the invention in addition to the shut-off lip, in cooperation with the shut-off lip, reliably closes the valve tube at its end facing the inside of the sack filled with filling material before small quantities of filling material are trickled out to such an extent that the subsequent inside closure of the valve tube by means of it in the adhesive or sealable state transferred inner layer is not impaired.

In weiterer Ausgestaltung der Erfindung kann die Absperrlippe von einem frei in das Sackinnere ragenden Endteil eines mit einem unteren Bereich auf dem ventilbildenden Eckeinschlag festgelegten und in einem oberen Bereich den Ventilschlauch tragenden Einlageblattes von die Sackbodenbreite übersteigender Breite gebildet sein, das in seinen außerhalb der Bodenseitenfalzlinien liegenden unteren Teilbereichen durch Verbindung mit den Bodenseitenumschlägen randseitig fixiert ist. Hierbei ist die Lage der Absperrlippe, ebenso wie die der Abdichtlippe, in bezug auf die in das Sackinnere ausmündende Öffnung des Ventilschlauchs definiert, und es erfolgt unter dem Druck des eingerüliten Füllguts eine entsprechend vorgegebene Anlagebewegung der Absperr- und der Abdichtlippe gegen die innere Ventilschlauchöffnung, um das Ausrieseln von Füllgut zu verhindern.In a further embodiment of the invention, the shut-off rib can be formed by an end part which projects freely into the inside of the sack and has an insert sheet with a lower area on the valve-forming corner insert and in an upper area supporting the valve tube and having a width which exceeds the sack bottom width and which lies outside the bottom side fold lines lower sub-areas is fixed at the edge by connection with the bottom side envelopes. Here, the position of the shut-off lip, like that of the sealing lip, is in relation to the opening of the valve hose opening into the interior of the sack defined, and there is a correspondingly predetermined movement of the shut-off and sealing lip against the inner valve hose opening under the pressure of the inserted filling material in order to prevent the filling material from trickling out.

Für die Absperrlippe und die Abdichtlippe kommen grundsätzlich alle geeigneten weichen, schmiegsamen Materialien in Betracht, wie insbesondere Kunststoffolien, dünnes Papier, Faservlies und dgl. Es empfiehlt sich jedoch, die Abdichtlippe aus einem gegenüber dem der Absperrlippe flexibleren Material, z. B. aus einer dünnen Kunststoffolie herzustellen, wobei sodann die Absperrlippe zweckmäßig von einem etwas steiferen Material, z. B. Papier, gebildet ist.For the shut-off lip and the sealing lip, all suitable soft, pliable materials are considered, such as in particular plastic films, thin paper, nonwoven fabric and the like. However, it is recommended that the sealing lip be made of a material that is more flexible than that of the shut-off lip, e.g. B. from a thin plastic film, then the shut-off lip is advantageously made of a somewhat stiffer material, eg. B. paper is formed.

Die erfindungsgemäße Ausgestaltung ermöglicht nicht nur Querabmessungen des Ventilschlauches entsprechend der Bodenbreite, sondern gestattet auch ohne weiteres kleinere Querabmessungen des Ventilschlauches zur Anpassung des Ventilkanals an den vorgegebenen Durchmesser des Füllrüssels der automatischen Füllmaschinen des Verpackungsbetriebs.The configuration according to the invention not only enables transverse dimensions of the valve tube corresponding to the base width, but also allows smaller transverse dimensions of the valve tube to be adapted without further ado to adapt the valve channel to the predetermined diameter of the filling nozzle of the automatic filling machines of the packaging company.

Weitere Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachstehenden Beschreibung in Verbindung mit der Zeichnung, in der ein Ausführungsbeispiel des Gegenstands der Erfindung schematisch veranschaulicht ist. In der Zeichnung zeigen:

fig. 1
einen abgebrochen dargestellten senkrechten Schnitt durch die Ventilecke eines fertigen, geschlossenen Kreuzbodens der Erfindung,
fig. 2
eine Draufsicht auf das zu einem offenen Kreuzboden aufgezogene Ende eines Sackwerkstücks mit einer Ventilecke gemäß Fig. 1,
Fig. 3
eine perspektivische Darstellung der Einzelteile des Ventils gemäß den Fig. 1 und 2, und
Fig. 4
eine perspektivische Darstellung des Ventileckbereichs eines gefüllten Kreuzbodensackes in Verbindung mit einem Heißluftgebläse zur Reaktivierung der Innenbeschichtung des Ventilschlauchs.
Further advantages of the invention result from the claims and the following description in conjunction with the drawing, in which an embodiment of the object of the invention is illustrated schematically. The drawing shows:
fig. 1
a broken vertical section through the valve corner of a finished, closed cross bottom of the invention,
fig. 2nd
1 shows a plan view of the end of a bag workpiece with a valve corner according to FIG.
Fig. 3
a perspective view of the individual parts of the valve according to FIGS. 1 and 2, and
Fig. 4
a perspective view of the valve corner area of a filled cross bottom bag in connection with a hot air blower for reactivating the inner coating of the valve hose.

Bei dem in der Zeichnung veranschaulichten Ausführungsbeispiel ist ein dreilagiger Kreuzbodenventilsack aus Papier dargestellt, an dessen Stelle auch ein Kreuzbodenventilsack aus einer oder zwei Materiallagen oder in sonst geeigneter Lagenzahl treten kann. Anstelle von beispielsweise insgesamt aus Papier bestehenden Materiallagen können auch papierumfassende Materiallagen, z. B. mit Kunststoff- und/oder Metallfolien kaschiertes Papier, oder Zwischenlagen aus Metall-, Kunststoffolien und dgl. Materialien verwendet werden. Bei einer Herstellung des Kreuzbodens 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. An die Stelle eines Kreuzbodensackes kann ein Klotzbodensack treten, der sich durch die eingelegten Seitenfalten und die bereits im ungefüllten Zustand des Sackes rechteckigen Böden von einem Kreuzbodensack unterscheidet. Als Sackmaterial kommen auch Kunststoffolien allein in Betracht.In the exemplary embodiment illustrated in the drawing, a three-layer cross-bottom valve sack made of paper is shown, in its place a cross-bottom valve sack made of one or two material layers or in an otherwise suitable number of layers can also occur. Instead of, for example, material layers made entirely of paper, paper-encompassing material layers, e.g. B. with plastic and / or metal foils laminated paper, or intermediate layers of metal, plastic foils and the like. Materials are used. In the production of the cross base by means of material bonding, the material sides or layers consisting of paper are preferably used, which allow the use of starch-based adhesives customary in paper bag production. A block bottom sack can be used instead of a cross bottom sack, which differs from a cross bottom sack by the inserted side folds and the rectangular bottoms already in the unfilled state of the sack. Plastic films are also considered as the bag material alone.

Bei dem dargestellten Beispiel ist in der den Kreuzboden im noch offenen, d. h. noch nicht fertiggestellten, geschlossenen Zustand zeigenden Fig. 2 die Bodenmittelbruchlinie mit 1 bezeichnet, während die beiden Bodenseitenfalzlinien bei 2 und 3 jeweils strichpunktiert veranschaulicht sind. Die beiden Bodenseitenumschläge des offenen Kreuzbodens sind mit 4 bzw. 5 und die beiden Eckeinschläge mit 6 und 7 bezeichnet. Die drei konzentrisch zueinander angeordneten Materiallagen sind mit 8, 9 und 10 bezeichnet und in an sich bekannter Weise endseitig gestaffelt, wobei ferner die Materiallagen mit Einschnitten zur Verlängerung der Bodenseitenumschläge 4 und 5 in Bodenlängsrichtung versehen sind.In the example shown, in FIG. 2, which shows the bottom of the cross in the still open, ie not yet finished, closed state, the bottom middle fold line is designated by 1, while the two bottom side fold lines at 2 and 3 are each shown in dash-dot lines. The two bottom envelopes of the open cross base are designated 4 and 5 and the two corner folds with 6 and 7. The three material layers arranged concentrically to one another are designated 8, 9 and 10 and are staggered at the ends in a manner known per se, the material layers also being provided with incisions for extending the bottom side envelopes 4 and 5 in the longitudinal direction of the bottom.

Der Eckeinschlag 7 ist der ventilbildende Eckeinschlag, auf den mittels eines Klebstoffauftrags 11 (Fig. 1) ein Einlageblatt 12 aus Papier zur Herstellung eines Füllventils aufgeklebt wird. Das Einlageblatt 12 weist einen Umschlag mit zum Sackäußeren gerichteter Faltkante 13 auf, wobei der untere Umschlagteil 14 mittels des Klebstoffauftrags 11 auf den Eckeinschlag 7 aufgeklebt ist. Die Breite des Einlageblattes 12 übersteigt die Breite des fertigen Sackbodens, die von dem Quermaß zwischen den Bodenseitenfalzlinien 2 und 3 definiert ist. In seinen außerhalb der Bodenseitenfalzlinien 2, 3 liegenden Teilbereichen ist der Umschlagteil 14 durch Klebstoffaufträge 15 (Fig. 2) mit den Bodenseitenumschlägen 4 und 5 verbunden und somit randseitig fixiert.The corner insert 7 is the valve-forming corner insert, onto which an insert sheet 12 made of paper is glued to produce a filling valve by means of an adhesive application 11 (FIG. 1). The insert sheet 12 has an envelope with the fold edge 13 directed towards the outside of the bag, the lower envelope part 14 being glued onto the corner wrap 7 by means of the adhesive application 11. The width of the insert sheet 12 exceeds the width of the finished sack bottom, which is defined by the transverse dimension between the bottom side fold lines 2 and 3. In its partial areas lying outside the bottom side fold lines 2, 3, the cover part 14 is connected to the bottom side envelopes 4 and 5 by adhesive layers 15 (FIG. 2) and thus fixed on the edge side.

Auf den oberen Umschlagteil 16 des Einlageblattes 12 ist mittels eines Klebstoffauftrags 17 (Fig. 1) ein Ventilschlauch 18 aufgeklebt, dessen Breite bzw. Quermaß kleiner als die Sackbodenbreite ist, wie dies insbesondere die fig. 2 bis 4 zeigen. Der Ventilschlauch 18 besteht aus einer Papierlage, die mit Hilfe einer Längsnaht 19 zum Schlauch geformt ist, und weist eine Innenbeschichtung aus einem thermoplastischen Material auf, das normalerweise, d. h. insbesondere bei Raumtemperatur, klebunwirksam ist, jedoch durch Heißluftzufuhr in einen kleb- bzw. siegelfähigen Zustand überführt werden kann, um den Ventilschlauch 18 unter flachem Zusammendrücken flächig zu verschließen. Die Breite des Ventilschlauchs 18 ist entsprechend dem vorgegebenen Durchmesser des Füllrüssels einer Füllmaschine gewählt.On the upper cover part 16 of the insert sheet 12, a valve tube 18 is glued by means of an adhesive application 17 (FIG. 1), the width or transverse dimension of which is smaller than the width of the sack bottom, as is particularly shown in FIG. 2 to 4 show. The valve hose 18 consists of a paper layer which is formed into a hose by means of a longitudinal seam 19 and has an inner coating made of a thermoplastic material which is normally, i. H. is particularly ineffective at room temperature, but can be converted into an adhesive or sealable state by supplying hot air, in order to close the valve tube 18 flatly with a flat compression. The width of the valve hose 18 is selected in accordance with the predetermined diameter of the filling nozzle of a filling machine.

Während der untere Umschlagteil 14 an seinem dem Sackinneren zugewandten Ende vor der Innenkante 20 des Eckeinschlags 7 endet, ist der obere Umschlagteil 16 über die Innenkante 20 des Eckeinschlags 7 zum Sackinneren hinausgeführt und überragt ferner den Ventilschlauch 18 an seinem dem Sackinneren zugewandten Ende um ein kurzes Teilstück von etwa 15 bis 20 mm Länge. Dieses, den Ventilschlauch 18 zum Sackinneren hin überragende Teilstück des oberen Umschlagteils 16 bildet eine Absperrlippe 21, die unter dem Druck des in das Sackinnere eingefüllten Füllguts selbsttätig in eine die innere Öffnung des Ventilschlauchs 18 abdichtende Sperrstellung bewegbar ist.While the lower envelope part 14 ends at its end facing the sack interior in front of the inner edge 20 of the corner wrap 7, the upper envelope part 16 extends beyond the inner edge 20 of the corner wrap 7 to the interior of the sack and also projects a short distance beyond the valve tube 18 at its end facing the interior of the sack Section of about 15 to 20 mm in length. This, the valve tube 18 projecting toward the inside of the bag portion of the upper envelope part 16 forms a shut-off lip 21, which under the pressure of the filling material filled into the sack can be moved automatically into a blocking position sealing the inner opening of the valve tube 18.

Diese, gemäß der Darstellung in Fig. 1 aufwärts gerichtete Bewegung der Absperrlippe 21 in ihre Verschlußstellung vor der inneren Ventilschlauchöffnung wird dadurch begünstigt, daß die beiden Umschlagteile 14 und 16 des Einlageblattes 12 eine zum Sackinneren hin offen ausmündende Tasche 22 bilden. Durch in die Tasche 22 eindringendes fullgut kann die Tasche 22 aufgeweitet werden, mit der folge, daß sich der obere Umschlagteil 16 nach oben und entsprechend die Abdichtlippe 21 gegen die innere Ventilschlauchöffnung legt, deren Randkante 23 dabei als Widerlager wirkt.This, as shown in FIG. 1, upward movement of the shut-off lip 21 into its closed position in front of the inner valve hose opening is favored in that the two cover parts 14 and 16 of the insert sheet 12 form a pocket 22 which opens out towards the inside of the sack. By full material penetrating into the pocket 22, the pocket 22 can be widened, with the result that the upper cover part 16 lies upwards and accordingly the sealing lip 21 lies against the inner valve hose opening, the edge 23 of which acts as an abutment.

Zusätzlich ist zu der vom Einlageblatt 12 gebildeten Absperrlippe 21 eine Abdichtlippe 24 vorgesehen, die die Absperrlippe 21 zum Sackinneren hin überragt. Die Abdichtlippe 24 ist von einem frei in das Sackinnere ragenden Endteil eines Zuschnitts 25 aus beispielsweise Kunststoffolie gebildet, dessen Breite die Bodenbreite übersteigt. In seinen außerhalb der Bodenseitenfalzlinien 2 und 3 liegenden Teilbereichen ist der Zuschnitt 25 mit Hilfe von Klebstoffaufträgen 26 (Fig. 2) mit den Bodenseitenumschlägen 4 und 5 verklebt und somit, wie das Einlageblatt 12, randseitig fixiert. Der Zuschnitt 25 ist mit seinem zum Sackäußeren gerichteten, mit einem Umschlag versehenen Endteil in den Umschlag des Einlageblattes 12 lose eingefaßt, d. h. daß keine Klebstoffverbindungen zwischen dem Zuschnitt 25 und dem Einlageblatt 12 im Bereich der Bodenbreite vorhanden sind. Der obere oder Hauptteil 27 des Zuschnitts 25 bildet dabei mit dem oberen Umschlagteil 16 des Einlageblatts 12 eine zum Sackinneren hin offen ausmündende Tasche 28, die, wie die Tasche 22, durch eindringendes Füllgut aufgeweitet werden kann, derart, daß die Anlagebewegung der Absperrlippe 21 gegen die innere Ventilschlauchöffnung zusätzlich unterstützt wird. Insgesamt ist durch die Aufspreizbewegung der Tasche 22 unter der Wirkung des eingefüllten Füllguts die Anlagebewegung sowohl der Absperrlippe 21 wie auch der Abichtlippe 24 gegen die innere Ventilschlauchöffnung vorgegeben.In addition to the shut-off lip 21 formed by the insert sheet 12, a sealing lip 24 is provided which projects beyond the shut-off lip 21 towards the inside of the bag. The sealing lip 24 is formed by an end part of a blank 25, for example plastic film, which projects freely into the sack interior and whose width exceeds the base width. In its partial areas lying outside the bottom side fold lines 2 and 3, the blank 25 is glued to the bottom side envelopes 4 and 5 with the aid of adhesive applications 26 (FIG. 2) and thus, like the insert sheet 12, is fixed at the edge. The blank 25 is loosely framed with its end part facing the bag, provided with an envelope, in the envelope of the insert sheet 12, ie there are no adhesive connections between the blank 25 and the insert sheet 12 in the area of the base width. The upper or main part 27 of the blank 25 forms with the upper cover part 16 of the insert sheet 12 a pocket 28 which opens out towards the inside of the sack and which, like the pocket 22, can be widened by penetrating filling material in such a way that the contact movement of the shut-off lip 21 counteracts the inner valve hose opening is additionally supported. Overall, due to the spreading movement of the pocket 22 under the effect of the filled product, the system movement is both the shut-off lip 21 and the sealing lip 24 against the inner valve hose opening.

In Fig. 1 ist ein auf den fertigen, geschlossenen Kreuzboden außenseitig aufgeklebtes Bodendeckblatt 29 mit einem Umschlag 30 an der Ventilecke dargestellt, der den Außenbereich des Ventils und insbesondere des Ventilschlauchs 18 abdeckt und verstärkt.1 shows a bottom cover sheet 29 glued to the finished, closed cross bottom on the outside with an envelope 30 on the valve corner, which covers and reinforces the outside area of the valve and in particular of the valve hose 18.

Bei der aus Fig. 4 ersichtlichen Abwandlung ist ein derartiges Bodendecklatt nicht vorgesehen. Die Verstärkung des Ventils in seinem äußeren Randbereich wird hierbei von den Bodenseitenumschlägen 4 und 5 übernommen, die in an sich bekannter Weise mit parallel zur Sackschlauchachse angeordneten Einschnitten versehen sind und eine Verlängerung der Bodenseitenumschläge 4, 5 in Bodenlängsrichtung, d. h. nach außen zu den Sackecken hin, bewirken.In the modification shown in FIG. 4, such a floor covering sheet is not provided. The reinforcement of the valve in its outer edge region is taken over by the bottom side envelopes 4 and 5, which are provided in a manner known per se with incisions arranged parallel to the bag hose axis and an extension of the bottom side envelopes 4, 5 in the longitudinal direction of the bottom, i.e. H. outwards towards the sack corners.

In Fig. 4 ist ferner ein Heißluftgebläse 31 einer Vorrichtung zum Verschließen der gefüllten Säcke dargestellt. Aus dem Mundstück 32 des Heißluftgebläses 31 werden Heißluftstrahlen auf die Innenbeschichtung des leicht geöffneten Ventilschlauchs 18 gerichtet, um dessen Innenbeschichtung in den klebe- bzw. siegelfähigen Zustand zu überführen, damit der vom Ventilschlauch 18 definierte innere Ventilkanal unter flachem Zusammendrücken des Ventilschlauchs 18 vollflächig staubdicht verschlossen werden kann.FIG. 4 also shows a hot air blower 31 of a device for closing the filled sacks. From the mouthpiece 32 of the hot air blower 31, hot air jets are directed onto the inner coating of the slightly open valve hose 18 in order to convert its inner coating into the adhesive or sealable state, so that the inner valve channel defined by the valve hose 18 is closed in a dust-tight manner with the valve hose 18 compressed flat can be.

Die aus Fig. 4 ersichtliche gegenseitige Zuordnung des Einlageblattes 12, des Ventilschlauchs 18 und des Abdichtmaterialzuschnitts 25 ergibt sich bei einem Einwärtsfalten, unter Verkleben, der Bodenseitenumschläge 4 und 5 um die Bodenseitenfalzlinien 2, 3 aus der aus den Fig. 3 und 4 ersichtlichen Stellung, wobei die außerhalb der Bodenseitenfalzlinien 2 und 3 liegenden Bereiche des Einlageblattes 12 und des Abdichtmaterialzuschnitts 25 mit umgefaltet werden.The mutual assignment of the insert sheet 12, the valve hose 18 and the sealing material cut 25, which can be seen from FIG. 4, results from folding inward, with gluing, of the bottom side envelopes 4 and 5 around the bottom side fold lines 2, 3 from the position shown in FIGS. 3 and 4 , wherein the areas of the insert sheet 12 and the sealing material blank 25 lying outside the bottom side fold lines 2 and 3 are also folded over.

Es versteht sich, daß in den Schnittdarstellungen die Lagenabstände im Interesse einer übersichtiichen Darstellung übertrieben groß gezeichnet sind.It is understood that in the sectional views Layer spacings are exaggerated in the interest of a clear representation.

Claims (10)

  1. A satchel-bottomed or block-bottomed valve bag of paper or like foldable material and having, worked into one of its two bag bottoms which are bounded laterally by bottom side-fold lines (2, 3), a filling valve in the region of a valve-forming corner tuck (7), said filling valve being, at its end which is towards the bag interior, overlapped on one side by a closure lip (21) of flexible material and at least as wide as the valve tube and which, under the pressure of the goods filled into the bag interior, can be moved automatically into a closure position to seal the inner valve tube aperture, characterised in that the filling valve is formed by a valve tube (18) with an inner coating and which can be moved from a normally non-adhesive state into an adhesive or sealable state for a sealing-tight closure of the valve tube (18) and in that the closure lip (21) which overlaps the underside of the valve tube (18) is itself, towards the bag interior, overlapped by a separate sealing lip (24) which is formed by, projecting freely into the bag interior, an end part of a prepared blank (25) of sealing material of a width which is greater than the width of the bottom and which, in its parts which are outside the side-fold lines (2, 3) of the bottom, is fixed marginally by being connected to the bottom side-seams (4, 5).
  2. A bag according to Claim 1, characterised in that the closure lip (21) has in respect of the corner tuck (7) a free overlap towards the bag interior.
  3. A bag according to Claim 1 or 2, characterised in that the closure lip (21) is formed by, projecting freely into the bag interior, an end part of an inlay sheet (12) carrying in an upper portion the valve tube (18) and having its bottom portion fixed on the valve-forming corner tuck (7), the said inlay sheet (12) being of a width which exceeds the width of the bag bottom and which, in its lower parts which are outside the side-fold lines (2, 3) of the bottom, is fixed marginally by being connected to the bottom side seams (4, 5).
  4. A bag according to Claim 3, characterised in that the inlay sheet (12) has a seam with a fold edge (13) directed towards the bag exterior, the bottom seam part (14) forming the marginally fixed lower part of the inlay sheet (12) which is fixed to the corner tuck (7) while the upper seam part (16) forms the upper portion of the inlay sheet (12) which carries the valve tube (18).
  5. A bag according to Claim 4, characterised in that the two seam parts (14, 16) of the inlay sheet (12) form a pocket (22) which opens out to the bag interior.
  6. A bag according to one of Claims 1 to 5, characterised in that the sealing lip (24) is formed from a material which is more flexible than that of the closure lip (21).
  7. A bag according to one of Claims 1 to 6, characterised in that the closure lip (21) consists of paper while the sealing lip (24) consists of a thin synthetic plastics film.
  8. A bag according to one of Claims 1 to 7, characterised in that the prepared blank (25) of sealing material has its end part which is towards the bag exterior caught into the seam of the inlay sheet (12) while its upper seam part (16) forms a pocket (28) which opens out towards the bag interior.
  9. A bag according to one of Claims 1 to 8, characterised in that the width of the valve tube (18) is smaller than the width of the bottom.
  10. A bag according to one of Claims 1 to 9, characterised in that the two bottom side seams (4, 5) of the bag bottom are in their end portions which are adjacent the valve-forming corner tuck (7), provided with recesses disposed parallel with the bag tube axis to extend it in the longitudinal direction of the bottom.
EP87100088A 1986-10-24 1987-01-07 Cross or block bottom valve bag Expired - Lifetime EP0264519B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87100088T ATE63518T1 (en) 1986-10-24 1987-01-07 CROSS OR BLOCK BOTTOM VALVE BAG.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8628387U 1986-10-24
DE8628387U DE8628387U1 (en) 1986-10-24 1986-10-24

Publications (3)

Publication Number Publication Date
EP0264519A2 EP0264519A2 (en) 1988-04-27
EP0264519A3 EP0264519A3 (en) 1989-03-15
EP0264519B1 true EP0264519B1 (en) 1991-05-15

Family

ID=6799546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100088A Expired - Lifetime EP0264519B1 (en) 1986-10-24 1987-01-07 Cross or block bottom valve bag

Country Status (6)

Country Link
US (1) US4759640A (en)
EP (1) EP0264519B1 (en)
AT (1) ATE63518T1 (en)
CA (1) CA1264463A (en)
DE (2) DE8628387U1 (en)
ES (1) ES2022816B3 (en)

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DE8811184U1 (en) * 1988-09-05 1988-11-10 Bischof Und Klein Gmbh & Co, 4540 Lengerich, De
US5516210A (en) * 1994-05-10 1996-05-14 Stone Container Corporation Self-closing sealable valve bag
US5806982A (en) * 1994-05-10 1998-09-15 Stone Container Corporation Self-closing sealable valve bag
DE19544072A1 (en) * 1995-11-25 1997-05-28 Herkules Verpackung Bag with flap for holding goods
US5967664A (en) * 1996-05-07 1999-10-19 Stone Container Corporation Sift proof valve bag
US6126316A (en) * 1996-09-05 2000-10-03 Bemis Company, Inc. Automatic self-closing valve closure assembly for valve bags
US6013018A (en) * 1996-09-05 2000-01-11 Bemis Company, Inc. Sonic valve closure assembly for valve bags
FI109290B (en) * 1997-03-18 2002-06-28 Upm Kymmene Oy valve Sack
US6164823A (en) * 1998-12-07 2000-12-26 Southern Bag Corporation, Ltd. Valve bag and method for making a valve bag
US6074095A (en) * 1999-02-16 2000-06-13 Bemis Company, Inc. Four member valve closure assembly for valve bags
US6499879B2 (en) 2001-05-02 2002-12-31 Hood Packaging Corporation Sealable valve bag and method for making a sealable valve bag
US6932508B2 (en) * 2002-12-20 2005-08-23 Smurfit-Stone Container Enterprises, Inc. Positive valve closure for plastic-lined bags and method for making same
DE202006018230U1 (en) * 2006-11-30 2008-04-10 Stabilo International Gmbh pen
US8142077B2 (en) * 2008-04-16 2012-03-27 Graphic Packaging International, Inc. Bag structures and methods of assembling the same
US20100008603A1 (en) * 2008-07-09 2010-01-14 Julie Rossing Smith Sealable repulpable valve bag and method of assembling
MX2015006021A (en) * 2012-11-14 2015-10-26 Mondi Bags Usa Llc Sift-resistant bag.
DE202013006198U1 (en) * 2013-07-09 2014-10-13 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh valve bag
NO2768978T3 (en) * 2014-02-20 2018-04-21
CN106043924A (en) * 2016-07-19 2016-10-26 河南佰嘉新型节能材料有限公司 Leakproof valve port, packaging bag with valve port and preparation method of packaging bag

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US3081930A (en) * 1957-10-17 1963-03-19 Paper Sacks Ltd Bag opening device
NL274369A (en) * 1961-02-07
DE1260958B (en) * 1964-02-04 1968-02-08 Windmoeller & Hoelscher Cross-bottom valve bag made of paper and a method for manufacturing and attaching its valve insert
DE1436838A1 (en) * 1965-11-02 1969-07-10 Sessbruegger & Van Delden Papi Tubular valve insert for valve bags
US4049191A (en) * 1976-02-02 1977-09-20 Great Plains Bag Corporation Block bottom valve bag
US4095736A (en) * 1976-10-22 1978-06-20 International Paper Company Bag closure having valve sleeve
DE2935971C2 (en) * 1979-09-06 1985-08-01 Bischof Und Klein Gmbh & Co, 4540 Lengerich Cross or block-bottom valve bag made of paper or a material comprising paper
DE3578331D1 (en) * 1984-12-05 1990-07-26 Svd Verpackungen Gmbh MULTILAYER PAPER VALVE BAG IN PAPER.
DE8534301U1 (en) * 1985-12-06 1986-01-23 Bischof Und Klein Gmbh & Co, 4540 Lengerich Cross or block bottom valve bag

Also Published As

Publication number Publication date
CA1264463A (en) 1990-01-16
US4759640A (en) 1988-07-26
ES2022816B3 (en) 1991-12-16
EP0264519A2 (en) 1988-04-27
ATE63518T1 (en) 1991-06-15
DE3770111D1 (en) 1991-06-20
DE8628387U1 (en) 1986-12-04
EP0264519A3 (en) 1989-03-15

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