EP0146819B1 - Valve bag made of plastic material - Google Patents

Valve bag made of plastic material Download PDF

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Publication number
EP0146819B1
EP0146819B1 EP84114516A EP84114516A EP0146819B1 EP 0146819 B1 EP0146819 B1 EP 0146819B1 EP 84114516 A EP84114516 A EP 84114516A EP 84114516 A EP84114516 A EP 84114516A EP 0146819 B1 EP0146819 B1 EP 0146819B1
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EP
European Patent Office
Prior art keywords
adhesive
valve
sheet
turn
bonded
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
Application number
EP84114516A
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German (de)
French (fr)
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EP0146819A3 (en
EP0146819A2 (en
Inventor
Josef Poppe
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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 EP0146819A2 publication Critical patent/EP0146819A2/en
Publication of EP0146819A3 publication Critical patent/EP0146819A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • B65D31/145—Valve bags, i.e. with valves for filling the filling port being provided in a flat upper sealing-edge

Definitions

  • the invention relates to a valve bag made of plastic film, consisting of a bag tube closed at its ends by a stand-up base and valve base, the bag bases each being formed by a molded base, the corner inserts and bottom side envelopes lying opposite one another in pairs, an inner base sheet and an outer cover sheet and a valve insert in the valve bottom, these parts forming the bottom of the mold including the outer cover sheet all consisting of the plastic film and being connected to one another by adhesive connections to form the bottom, which encompass adhesive layers and adhesive layers on the outside of the sack tube running all the way along the edge of the sack tube on the inside of the cover sheet.
  • the adhesive applications provided for the mutual bonding of the base parts are carried out in the manner of a thin layer of a contact adhesive, the base folding and the mutual bonding of the base parts taking place after the solvent of the contact adhesive has dried.
  • the adhesive is then in a dry or almost dry state and only sticks to itself, i.e. H. two similar layers of adhesive. Examples of molded bottoms of plastic valve bags glued in this way are described in DE-B-1753 634.
  • outer cover sheets which are thicker than the bag tube film and are therefore not as flexible when gluing as would be necessary for continuous full-surface gluing.
  • outer cover sheets which are thicker than the bag tube film and are therefore not as flexible when gluing as would be necessary for continuous full-surface gluing.
  • the use of thicker outer bottom cover sheets is caused by the bottom side envelopes which partially overlap each other in the closed molded bottom, because otherwise the top sheet in its longitudinal direction can easily break along the edge of the outer bottom side envelope under impact loads.
  • valve bag with end mold bases in which an inner base sheet is glued to the outside of at least one of the corner folds of a corresponding mold base.
  • the valve bag with its end parts forming the respective mold base, including the inner base sheet, consists of plastic film, while an outer cover sheet, which forms the outer end of the mold base, is made of paper and is glued to the outside of the mold base by means of an adhesive which ensures a satisfactory connection of the paper to the Cover sheet and the plastic material of the other bottom parts allows.
  • the outer cover sheet is provided with a plastic coating
  • its connection to the other base parts made of plastic film is made by welding.
  • DE-A-1611 668 discloses a valve bag made of plastic film with paired opposing corner inserts and bottom side envelopes comprising molded floors which are provided with an inner bottom sheet which has a width exceeding the bottom width of the finished bottom and the combined width of the bottom side envelopes. All connections of the bottom parts for bottom formation are made in this known sack shape by welding, which also applies to an outer cover sheet forming the outside closure of the bottom of the mold.
  • the invention has for its object to provide a valve bag made of plastic film with glued mold bottoms of the type mentioned, in which the mold bottoms have an increased tightness and which can be produced at high machine speeds.
  • the adhesive applications are pressure-sensitive in such a way that the adhesive sticks not only to itself but also to areas free of adhesive, the width of each bottom side envelope measured in the transverse direction of the mold bottom being less than half the bottom width of the respective one
  • the mold base is in its finished state and the inner base sheet itself is kept free of adhesive applications, is glued to the adhesive application on at least one of the corner folds of the mold base and has a width that exceeds the base width of the finished mold base and the combined width of the base side envelopes.
  • the pressure-sensitive adhesive-like formation of the adhesive applications that is to say first of all the adhesive applications which extend on the outside of the bag tube along its edge, enables the inner base sheet to be bonded without the latter itself having a corresponding adhesive application.
  • the adhesive used for the adhesive applications is set for this purpose soft and sticky in such a way that at the time of mutual adhesive bonding of the floor parts to be connected to one another is provided with a very sticky surface by the adhesive applications, it being possible for the adhesive strength to be improved further by applying adhesive applications of appropriate thickness.
  • an adhesive based on a known contact adhesive which consists of a mixture of isocyanate-modified polyesters with free hydroxyl groups and isocyanate resins and is dissolved for application in a solvent, for example by using polyester resins with a correspondingly low molecular weight a soft setting of this adhesive with increased surface tack at the time of the layer bonding can be achieved in such a way that the adhesive applications are also bonded to areas free of adhesive in the manner of a pressure sensitive adhesive.
  • the inner bottom sheet is glued with the adhesive application on the respective corner fold in the inventive design of the valve bag in such a way that channel formation on the folded edges between the corner folds and the bottom side envelopes is avoided if the side parts of the Bottom sheet are folded together with the bottom side envelopes to close the mold bottom.
  • the adhesive application lying on top of the corner wrap is covered by the inner base sheet or, in the case of a valve base, by a valve insert, so that there is no need to worry about the sticky adhesive orders being smeared when the sack hoses are transported through the floor folding station is.
  • the valve bag according to the invention can therefore be manufactured at high machine speeds.
  • each bottom side envelope is less than half the bottom width of the respective mold bottom in the sack configuration according to the invention, mutual overlap of the bottom side envelopes in the mold bottom and thus an area of the outer cover sheet which is prone to breakage are avoided.
  • the outer cover sheet can therefore be dimensioned correspondingly thinner and, for this reason, has an improved conformability when gluing, which further improves the tightness of the adhesive connection of the mold base.
  • the starting workpiece for the valve bag shown in the drawing is a bag tube 1 made of thermoplastic film, such as a polyolefin film, e.g. Polyethylene film, which is provided along the edges of its initially open ends on the outside with an all-round adhesive application 2.
  • a bag tube 1 made of thermoplastic film, such as a polyolefin film, e.g. Polyethylene film, which is provided along the edges of its initially open ends on the outside with an all-round adhesive application 2.
  • the bag hose 1 is drawn up at its two ends in a floor-laying machine to open molded floors 3 and 4.
  • the mold base 3 forms the stand base and the mold base 4 the valve base of the bag hose 1.
  • the shaped bottoms 3 and 4 each have the shape of a cross bottom in the example shown, but in their place, so-called block bottoms can also take place, if, unlike in the example shown, a tube piece with inserted side gussets is used as the starting workpiece .
  • the shaped or cross bottoms 3 and 4 comprise pairs of opposing corner inserts 5, 6 and bottom side envelopes 7, 8.
  • portions 2a lie in the illustrated, flat state of the sack workpiece of the adhesive application 2 on the top of the corner folds 5 and 6 and sections 2b on the underside of the bottom side envelopes 7 and 8, which are folded inward to close the bottom along bottom dash lines 9 shown in dash-dot lines in FIG.
  • an inner base sheet 10 is glued onto the sections 2a of the adhesive application 2, which has a strongly sticky surface, and which itself does not carry an adhesive application on its underside or on its upper side.
  • the in this way with the corners 5 and 6 a gluing incoming floor sheet 10 has a width which exceeds the floor width determined by the transverse dimension between the two bottom side fold lines 9 of the respective floor and the combined width of the bottom side envelopes 7 and 8, so that it corresponds to the Representation in Fig. 1 protrudes beyond the marginal edges 11 and 12 of the bottom side envelopes 7 and 8.
  • the bottom side envelopes 7 and 8 themselves have a width that is less than the bottom width.
  • the design of the valve base 4 differs from that of the base 3 in that the inner base sheet 10 'is shortened in length so that it is only glued to the portion 2a of the adhesive application 2 in the area of the corner wrap 6.
  • the bottom sheet 10 'shortened in length to such an extent that it is limited to only one half of the bottom; however, it can also have a length which is further drawn towards the corner wedge 5, but which does not reach it, since a tubular valve insert 13 is glued onto the section 2a of the adhesive application 2 of the corner wedge 5.
  • the valve insert 13 forms an outer pocket valve with a sleeve 14, which is known per se. The valve insert 13 which opens into the inside of the sack fills the sack, with the outer part 15 of the valve insert 13 being filled with the aid of the sleeve 14 after filling formed outer pocket is inserted as a valve closure.
  • the base side flaps 7 and 8 of both trays 3 and 4 are folded inward about the base side fold lines 9, as shown in FIG. 2.
  • the bottom sheet 10, 10 ' which is selected to be thinner than the film material of the bag tube 1, is folded over together with the bottom side envelopes 7 and 8.
  • Triangular end regions 16 of the corner folds 5 and 6 are included in the bottom side envelopes 7 and 8 to form folded edges 17 between the corner folds 5, 6 and the bottom side envelopes 7, 8.
  • the width of the base sheet 10, 10 ' is selected such that the side parts 10a and 10b of the base sheet 10, 10' folded inwards together with the base side envelopes 7 and 8 along the fold lines 9 align with them mutually facing edge areas overlap each other. This results in a reinforcement along the center of the floor.
  • an outer cover sheet 18 is glued onto the molded trays 3 and 4 with their inwardly folded bottom side envelopes 7 and 8, which for this purpose carries an adhesive application on its underside.
  • this adhesive application on the underside which, like the adhesive application 2 mentioned at the outset, is formed by a soft and tacky adhesive
  • the bottom sheet 18 is finally bonded not only to the sections 2b of the adhesive applications 2, not shown in FIGS. 2 and 3, on the outside - or top of the bottom side envelopes 7 and 8, but also with all adhesive-free areas of the bottom side envelopes 7 and 8 and with the areas of the inner bottom sheet 10, 10 'and the corner folds 5 provided for adhesive bonding with the cover sheet 18 , 6 or the valve insert 13.
  • the cover sheet 18 projects with its end parts 19 over the edge edges of the inner base sheet 10 in the area of the corner folds 5 and 6 of the base 3 or the edge edge of the inner base sheet 10 'in the area of the corner fold 6 Valve bottom 4, here the other end part 19 of Dec kblatts 18 is glued to the top of the valve insert 13.
  • the cover sheet 18 can in turn have a smaller thickness than the film material of the bag hose 1, so that it has a good conformability to the material layers in the respective mold base 3, 4 in the interest of a full-surface, tight adhesive bond.
  • the embodiment according to FIGS. 4 to 6 differs from that according to FIGS. 1 to 3 by a different design of the valve base 4.
  • the same reference numerals are used as in the case of the embodiment according to FIGS. 1 to 3 been used.
  • a tubular valve insert 20 is glued in the middle to the corner wrap 5 on the portion 2a of the adhesive application 2, the inner region 21 of which extends beyond the inner edge of the corner wrap 5 and projects into the interior of the sack.
  • the valve insert 20 forms a so-called inner valve, the inner region 21 of which causes an automatic valve closure after the bag has been filled with filling material.
  • the tubular valve insert 20, the z. B. is formed from a seamlessly extruded, thin piece of tubing made of plastic film, is glued as a flat tube on the corner wrap 5 and carries on its top or the upper half of the flat tube on the outside an adhesive application 22, which corresponds in its nature to the adhesive application 2.
  • an adhesive-free base sheet 10 of the same size as the base sheet 10 of the base 3 glued into the open valve base 4 its gluing in the area of the corner wrap 6 with the portion 2a of the adhesive application 2 and in the area of the corner wrap 5 with the areas of Part 2a takes place on both sides of the valve insert 20 and in the area in between with the adhesive application 22 of the valve insert 20.
  • a further modification of the first embodiment is made in that the width of the base sheet 10 in both the stand base 3 and in the valve base 4 is dimensioned such that the side parts 10a and 10b of the base sheet 10 folded over together with the base side envelopes 7 and 8 in the closed base according to 5 with their mutually facing edge edges 23 and 24 are arranged at a distance from one another.
  • the closed mold base 3, 4 a layer gradation between the bottom side envelopes 7 and 8 towards the center of the base is achieved, which, due to an improved application possibility for the cover sheet 18 finally applied to the closed mold bases 3, 4, is beneficial to the tightness of the cover sheet 18 by means of the cover sheet 18 induced bonding affects.

Description

Die Erfindung betrifft einen Ventilsack aus Kunststoffolie, bestehend aus einem an seinen Enden durch einen Standboden und Ventilboden geschlossenen Sackschlauch, wobei die Sackböden jeweils von einem Formboden gebildet sind, der paarweise einander gegenüberliegende Eckeinschläge und Bodenseitenumschläge, ein inneres Bodenblatt und ein äußeres Deckblatt sowie eine Ventileinlage im Ventilboden umfaßt, wobei diese den Formboden bildenden Teile einschließlich des äußeren Deckblattes sämtlich aus der Kunststoffolie bestehen und durch Klebverbindungen zur Bodenbildung miteinander verbunden sind, die auf der Außenseite des Sackschlauches rundum entlang dessen Randkante verlaufende Klebstoffaufträge und Klebstoffaufträge auf der Innenseite des Deckblattes umfassen.The invention relates to a valve bag made of plastic film, consisting of a bag tube closed at its ends by a stand-up base and valve base, the bag bases each being formed by a molded base, the corner inserts and bottom side envelopes lying opposite one another in pairs, an inner base sheet and an outer cover sheet and a valve insert in the valve bottom, these parts forming the bottom of the mold including the outer cover sheet all consisting of the plastic film and being connected to one another by adhesive connections to form the bottom, which encompass adhesive layers and adhesive layers on the outside of the sack tube running all the way along the edge of the sack tube on the inside of the cover sheet.

Bei einem bekannten Ventilsack aus Kunststofffolie dieser Art sind die zur gegenseitigen Verklebung der Bodenteile vorgesehenen Klebstoffaufträge nach Art einer dünnen Schicht eines Kontaktklebers ausgeführt, wobei die Bodenfaltung und die gegenseitige Verklebung der Bodenteile erfolgt, nachdem das Lösungsmittel des Kontaktklebers abgetrocknet ist. Der Klebstoff befindet sich dann in einem trockenen oder fast trockenen Zustand und verklebt nur mit sich selbst, d. h. zwei gleichartigen Klebstoffschichten. Beispiele für in dieser Weise geklebte Formböden von Kunststoffventilsäcken sind in der DE-B-1753 634 beschrieben. Durch das vorherige Abtrocknen des Lösungsmittels ist es zwar möglich, die jeweils an ihren beiden Enden mit einem Formboden zu versehenden Sackschläuche durch eine Bodenlegemaschine zu fördern, ohne daß durch die Klebstoffaufträge auf der Außenseite des Sackschlauches entlang dessen Randkanten ein Abschmieren der Klebstoffschicht auf Leitschienen u.dgl. Faltwerkzeuge der Bodenlegemaschine zu befürchten ist. Es hat sich jedoch gezeigt, daß durch die der den Sackschlauch bildenden Kunststoffolie innewohnenden Rückstellkräfte insbesondere an den Faltkanten zwischen den Eckeinschlägen und den Bodenseitenumschlägen des Formbodens Kanäle entstehen, die zu schließen die Kraft der dünnen miteinander zur Verklebung zu bringenden Kontaktkleberschichten nicht ausreicht und die daher die Ursache für Undichtigkeiten des Bodens sind. Eine weitere Gefahr für Bodenundichtigkeiten stellt die Verwendung äußerer Deckblätter dar, die dicker als die Sackschlauchfolie und daher bei der Verklebung nicht so anschmiegsam sind, wie es für eine durchgehend vollflächige Verklebung erforderlich wäre. Die Verwendung dickerer äußerer Bodendeckblätter ist bei den bekannten Ventilsäcken durch die sich im geschlossenen Formboden bereichsweise gegenseitig überlappenden Bodenseitenumschläge bedingt, weil anderenfalls entlang der Kante des äußeren Bodenseitenumschlags bei stoßartiger Belastung leicht ein Bruch des Deckblattes in seiner Längsrichtung eintreten kann.In a known valve sack made of plastic film of this type, the adhesive applications provided for the mutual bonding of the base parts are carried out in the manner of a thin layer of a contact adhesive, the base folding and the mutual bonding of the base parts taking place after the solvent of the contact adhesive has dried. The adhesive is then in a dry or almost dry state and only sticks to itself, i.e. H. two similar layers of adhesive. Examples of molded bottoms of plastic valve bags glued in this way are described in DE-B-1753 634. By drying the solvent beforehand, it is possible to convey the bag hoses to be provided with a mold bottom at both ends through a floor laying machine, without the adhesive layers on the outside of the bag hose lining the edge of the bag lubricating the adhesive layer on guide rails and the like. the like Folding tools of the floor laying machine is to be feared. However, it has been shown that the restoring forces inherent in the plastic tube forming the bag tube, particularly at the folded edges between the corner folds and the bottom side envelopes of the molded base, create channels which close the force of the thin contact adhesive layers which are to be bonded to one another and which therefore do not suffice The cause of leaks in the floor are. A further danger for floor leaks is the use of outer cover sheets, which are thicker than the bag tube film and are therefore not as flexible when gluing as would be necessary for continuous full-surface gluing. In the known valve bags, the use of thicker outer bottom cover sheets is caused by the bottom side envelopes which partially overlap each other in the closed molded bottom, because otherwise the top sheet in its longitudinal direction can easily break along the edge of the outer bottom side envelope under impact loads.

Aus der GB-A-10 39 134 ist ein Ventilsack mit endseitigen Formböden bekannt, bei denen ein inneres Bodenblatt auf die Außenseite zumindest eines der Eckeinschläge eines entsprechenden Formbodens aufgeklebt ist. Der Ventilsack mit seinen den jeweiligen Formboden bildenden Endteilen einschließlich des inneren Bodenblattes besteht hierbei aus Kunststoffolie, während ein den außenseitigen Abschluß des Formbodens bildendes äußeres Deckblatt aus Papier besteht und auf die Außenseite des Formbodens mittels eines Klebstoffes aufgeklebt wird, der eine zufriedenstellende Verbindung des Papiers des Deckblattes und des Kunststoffmaterials der übrigen Bodenteile ermöglicht. Bei einer Variante des bekannten Ventilsackes, bei der das äußere Deckblatt mit einer Kunststoffbeschichtung versehen ist, wird dessen Verbindung mit den übrigen, aus Kunststoffolie bestehenden Bodenteilen durch Schweißen vorgenommen.From GB-A-10 39 134 a valve bag with end mold bases is known, in which an inner base sheet is glued to the outside of at least one of the corner folds of a corresponding mold base. The valve bag with its end parts forming the respective mold base, including the inner base sheet, consists of plastic film, while an outer cover sheet, which forms the outer end of the mold base, is made of paper and is glued to the outside of the mold base by means of an adhesive which ensures a satisfactory connection of the paper to the Cover sheet and the plastic material of the other bottom parts allows. In a variant of the known valve bag, in which the outer cover sheet is provided with a plastic coating, its connection to the other base parts made of plastic film is made by welding.

Die DE-A-1611 668 offenbart einen Ventilsack aus Kunststoffolie mit paarweise einander gegenüberliegende Eckeinschläge und Bodenseitenumschläge umfassenden Formböden, die mit einem inneren Bodenblatt versehen sind, das eine die Bodenbreite des fertigen Bodens und die zusammengenommene Breite der Bodenseitenumschläge übersteigende Breite aufweist. Sämtliche Verbindungen der Bodenteile zur Bodenbildung werden bei dieser bekannten Sackform durch Verschweißungen vorgenommen, was auch für ein den außenseitigen Abschluß des Formbodens bildendes äußeres Deckblatt gilt.DE-A-1611 668 discloses a valve bag made of plastic film with paired opposing corner inserts and bottom side envelopes comprising molded floors which are provided with an inner bottom sheet which has a width exceeding the bottom width of the finished bottom and the combined width of the bottom side envelopes. All connections of the bottom parts for bottom formation are made in this known sack shape by welding, which also applies to an outer cover sheet forming the outside closure of the bottom of the mold.

Der Erfindung liegt die Aufgabe zugrunde, einen Ventilsack aus Kunststoffolie mit geklebten Formböden der eingangs angegebenen Art zu schaffen, bei dem die Formböden eine erhöhte Dichtigkeit aufweisen und der dabei mit hohen Maschinengeschwindigkeiten herstellbar ist.The invention has for its object to provide a valve bag made of plastic film with glued mold bottoms of the type mentioned, in which the mold bottoms have an increased tightness and which can be produced at high machine speeds.

Diese Aufgabe wird nach der Erfindung dadurch gelöst, daß die Klebstoffaufträge haftklebeartig ausgebildet sind, derart, daß der Klebstoff nicht nur mit sich selbst, sondern auch mit klebstofffreien Bereichen verklebt, die in Querrichtung des Formbodens gemessene Breite jedes Bodenseitenumschlags geringer als die halbe Bodenbreite des jeweiligen Formbodens in seinem fertiggestellten Zustand ist und das innere Bodenblatt selbst von Klebstoffaufträgen freigehalten, mit dem Klebstoffauftrag auf zumindest einem der Eckeinschläge des Formbodens verklebt ist und eine die Bodenbreite des fertiggestellten Formbodens und die zusammengenommene Breite der Bodenseitenumschläge übersteigende Breite aufweist.This object is achieved according to the invention in that the adhesive applications are pressure-sensitive in such a way that the adhesive sticks not only to itself but also to areas free of adhesive, the width of each bottom side envelope measured in the transverse direction of the mold bottom being less than half the bottom width of the respective one The mold base is in its finished state and the inner base sheet itself is kept free of adhesive applications, is glued to the adhesive application on at least one of the corner folds of the mold base and has a width that exceeds the base width of the finished mold base and the combined width of the base side envelopes.

Bei dieser Ausgestaltung kann durch die haftklebeartige Ausbildung der Klebstoffaufträge, d. h. zunächst der Klebstoffaufträge, die sich auf der Außenseite des Sackschlauches entlang dessen Randkante erstrecken, eine Verklebung mit dem inneren Bodenblatt erfolgen, ohne daß dieses selbst einen entsprechenden Klebstoffauftrag besitzt. Der für die Klebstoffaufträge verwendete Klebstoff ist zu diesem Zweck in der Weise weich und klebrig eingestellt, daß zum Zeitpunkt der gegenseitigen Verklebung der miteinander zu verbindenden Bodenteile von den Klebstoffaufträgen eine sehr klebrige Oberfläche dargeboten wird, wobei die Klebkraft noch durch entsprechend dick bemessene Klebstoffaufträge verbessert werden kann. Für die Erzielung einer solchen klebrigen Oberfläche der Klebstoffaufträge zum Zeitpunkt der Lagenverbindung, die auch eine Verklebung mit klebstofffreien Folienbereichen eingeht, stehen dem Fachmann geeignete Klebstoffe oder Kleblacke zur Verfügung, die zum Verkleben der bei der Herstellung von Kunststoffsäcken Verwendung findenden Kunststoffolien, z. B. Polyolefinfolien, insbesondere Polyäthylenfolien, erprobt sind. So kann beispielsweise ein Klebstoff auf der Grundlage eines bekannten Kontaktklebers verwendet werden, der aus einer Mischung von isocyanat-modifizierten Polyestern mit freien Hydroxylgruppen und Isocyanatharzen besteht und zum Auftragen in einem Lösungsmittel gelöst wird, wobei beispielsweise durch eine Verwendung von Polyesterharzen mit einem entsprechend niedrigen Molekulargewicht eine Weicheinstellung dieses Klebstoffs mit erhöhter Oberflächenklebrigkeit zum Zeitpunkt der Lagenverklebung in der Weise erreicht werden kann, daß nach Art eines Haftklebers auch eine Verklebung der Klebstoffaufträge mit klebstofffreien Bereichen stattfindet. So erfolgt eine Verklebung des inneren Bodenblatts mit dem Klebstoffauftrag auf dem jeweiligen Eckeinschlag bei der erfindungsgemä- ßen Ausgestaltung des Ventilsackes in der Weise, daß eine Kanalbildung an den Faltkanten zwischen den Eckeinschlägen und den Bodenseitenumschlägen vermieden ist, wenn die außerhalb der üblichen Bodenseitenfalzlinien liegenden Seitenteile des Bodenblattes zusammen mit den Bodenseitenumschlägen zum Schließen des Formbodens nach innen gefaltet werden. Während des Transports durch die Faltstation der Bodenlegemaschine ist der jeweils oben auf dem Eckeinschlag liegende Klebstoffauftrag von dem inneren Bodenblatt bzw. bei einem Ventilboden von einer Ventileinlage abgedeckt, so daß kein Abschmieren der an sich stark klebrigen Klebstoffaufträge beim Transport der Sackschläuche durch die Bodenfaltstation zu befürchten ist. Der erfindungsgemäße Ventilsack kann daher insoweit mit hohen Maschinengeschwindigkeiten hergestellt werden. Da ferner in der erfindungsgemäßen Sackausgestaltung die Breite jedes Bodenseitenumschlags geringer als die halbe Bodenbreite des jeweiligen Formbodens ist, ist eine gegenseitige Überlappung der Bodenseitenumschläge im Formboden und damit ein bruchgefährdeter Bereich des äußeren Deckblattes vermieden. Das äußere Deckblatt kann daher entsprechend dünner bemessen sein und besitzt aus diesem Grunde eine verbesserte Anschmiegsamkeit bei der Verklebung, die die Dichtigkeit der Klebeverbindung des Formbodens weiter verbessert.In this embodiment, the pressure-sensitive adhesive-like formation of the adhesive applications, that is to say first of all the adhesive applications which extend on the outside of the bag tube along its edge, enables the inner base sheet to be bonded without the latter itself having a corresponding adhesive application. The adhesive used for the adhesive applications is set for this purpose soft and sticky in such a way that at the time of mutual adhesive bonding of the floor parts to be connected to one another is provided with a very sticky surface by the adhesive applications, it being possible for the adhesive strength to be improved further by applying adhesive applications of appropriate thickness. In order to achieve such a sticky surface of the adhesive applications at the time of the ply connection, which also involves gluing with adhesive-free film areas, suitable adhesives or adhesive varnishes are available to the person skilled in the art, which are used for gluing the plastic films used in the production of plastic bags, e.g. B. polyolefin films, especially polyethylene films, have been tried. For example, an adhesive based on a known contact adhesive can be used, which consists of a mixture of isocyanate-modified polyesters with free hydroxyl groups and isocyanate resins and is dissolved for application in a solvent, for example by using polyester resins with a correspondingly low molecular weight a soft setting of this adhesive with increased surface tack at the time of the layer bonding can be achieved in such a way that the adhesive applications are also bonded to areas free of adhesive in the manner of a pressure sensitive adhesive. Thus, the inner bottom sheet is glued with the adhesive application on the respective corner fold in the inventive design of the valve bag in such a way that channel formation on the folded edges between the corner folds and the bottom side envelopes is avoided if the side parts of the Bottom sheet are folded together with the bottom side envelopes to close the mold bottom. During transport through the folding station of the floor-laying machine, the adhesive application lying on top of the corner wrap is covered by the inner base sheet or, in the case of a valve base, by a valve insert, so that there is no need to worry about the sticky adhesive orders being smeared when the sack hoses are transported through the floor folding station is. To this extent, the valve bag according to the invention can therefore be manufactured at high machine speeds. Furthermore, since the width of each bottom side envelope is less than half the bottom width of the respective mold bottom in the sack configuration according to the invention, mutual overlap of the bottom side envelopes in the mold bottom and thus an area of the outer cover sheet which is prone to breakage are avoided. The outer cover sheet can therefore be dimensioned correspondingly thinner and, for this reason, has an improved conformability when gluing, which further improves the tightness of the adhesive connection of the mold base.

Zahlreiche weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und der nachstehenden Beschreibung in Verbindung mit der Zeichnung, in der zwei Ausführungsbeispiele des Gegenstandes der Erfindung schematisch veranschaulicht sind. In der Zeichnung zeigen:

  • Fig. 1 bis 3 je eine Draufsicht auf einen Ventilsack nach einem ersten Ausführungsbeispiel in verschiedenen Herstellungsstadien und
  • Fig. 4 bis 6 Ansichten entsprechend den Fig. 1 bis 3 zur Veranschaulichung eines weiteren Ausführungsbeispiels.
Numerous further features and advantages of the invention result from the subclaims and the following description in conjunction with the drawing, in which two exemplary embodiments of the subject matter of the invention are illustrated schematically. The drawing shows:
  • 1 to 3 are each a top view of a valve bag according to a first embodiment in different stages of manufacture and
  • 4 to 6 views corresponding to FIGS. 1 to 3 to illustrate a further embodiment.

Das Ausgangswerkstück für den in der Zeichnung dargestellten Ventilsack ist ein Sackschlauch 1 aus thermoplastischer Kunststoffolie, wie einer Polyolefinfolie, z.B. Polyäthylenfolie, der entlang den Randkanten seiner anfänglich offenen Enden auf der Außenseite jeweils mit einem rundum verlaufenden Klebstoffauftrag 2 versehen ist. Im mit den Klebaufträgen 2 versehenen Zustand wird der Sackschlauch 1 an seinen beiden Enden in einer Bodenlegemaschine zu offenen Formböden 3 und 4 aufgezogen. Der Formboden 3 bildet den Standboden und der Formboden 4 den Ventilboden des Sackschlauches 1.The starting workpiece for the valve bag shown in the drawing is a bag tube 1 made of thermoplastic film, such as a polyolefin film, e.g. Polyethylene film, which is provided along the edges of its initially open ends on the outside with an all-round adhesive application 2. In the state provided with the adhesive orders 2, the bag hose 1 is drawn up at its two ends in a floor-laying machine to open molded floors 3 and 4. The mold base 3 forms the stand base and the mold base 4 the valve base of the bag hose 1.

Die Formböden 3 und 4 besitzen bei dem dargestellten Beispiel jeweils die Form eines Kreuzbodens, an dessen Stelle jedoch in an sich bekannter Weise auch sog. Blockböden treten können, wenn, anders als bei dem dargestellten Beispiel, ein Schlauchstück mit eingelegten Seitenfalten als Ausgangswerkstück Verwendung findet. Die Form- bzw. Kreuzböden 3 und 4 umfassen paarweise einander gegenüberliegende Eckeinschläge 5, 6 und Bodenseitenumschläge 7, 8. Nach dem Aufziehen der offenen Enden des Sackschlauches 1 zu den offenen Kreuzböden 3 und 4 liegen in dem dargestellten, flachgelegten Zustand des Sackwerkstücks Teilstücke 2a des Klebstoffauftrags 2 auf der Oberseite der Eckeinschläge 5 und 6 und Teilstücke 2b auf der Unterseite der Bodenseitenumschläge 7 und 8, die zum Schließen des Bodens entlang in Fig. 4 strichpunktiert eingezeichneter Bodenseitenfalzlinien 9 einwärts umgefaltet werden.The shaped bottoms 3 and 4 each have the shape of a cross bottom in the example shown, but in their place, so-called block bottoms can also take place, if, unlike in the example shown, a tube piece with inserted side gussets is used as the starting workpiece . The shaped or cross bottoms 3 and 4 comprise pairs of opposing corner inserts 5, 6 and bottom side envelopes 7, 8. After the open ends of the sack tube 1 have been pulled open to the open cross bottoms 3 and 4, portions 2a lie in the illustrated, flat state of the sack workpiece of the adhesive application 2 on the top of the corner folds 5 and 6 and sections 2b on the underside of the bottom side envelopes 7 and 8, which are folded inward to close the bottom along bottom dash lines 9 shown in dash-dot lines in FIG.

Im Standboden 3 ist auf die Teilstücke 2a des eine stark klebrige Oberfläche darbietenden Klebstoffauftrags 2 ein inneres Bodenblatt 10 aufgeklebt, das selbst weder auf seiner Unterseite noch auf seiner Oberseite einen Klebstoffauftrag trägt. Das auf diese Weise mit den Eckeinschlägen 5 und 6 eine Verklebung eingehende Bodenblatt 10 besitzt eine Breite, die die von dem Quermaß zwischen den beiden Bodenseitenfalzlinien 9 des jeweiligen Bodens bestimmte Bodenbreite und die zusammengenommene Breite der Bodenseitenumschläge 7 und 8 übersteigt, so daß es entsprechend der Darstellung in Fig. 1 über die Randkanten 11 und 12 der Bodenseitenumschläge 7 und 8 hinausragt. Die Bodenseitenumschläge 7 und 8 besitzen dabei selbst eine Breite, die geringer ist als die Bodenbreite.In the base 3, an inner base sheet 10 is glued onto the sections 2a of the adhesive application 2, which has a strongly sticky surface, and which itself does not carry an adhesive application on its underside or on its upper side. The in this way with the corners 5 and 6 a gluing incoming floor sheet 10 has a width which exceeds the floor width determined by the transverse dimension between the two bottom side fold lines 9 of the respective floor and the combined width of the bottom side envelopes 7 and 8, so that it corresponds to the Representation in Fig. 1 protrudes beyond the marginal edges 11 and 12 of the bottom side envelopes 7 and 8. The bottom side envelopes 7 and 8 themselves have a width that is less than the bottom width.

Die Ausbildung des Ventilbodens 4 unterscheidet sich von der des Standbodens 3 dadurch, daß das innere Bodenblatt 10' in seiner Länge verkürzt ist, so daß es nur auf das Teilstück 2a des Klebstoffauftrags 2 im Bereich des Eckeinschlags 6 aufgeklebt ist. Bei dem dargestellten Beispiel ist das Bodenblatt 10' in seiner Länge soweit verkürzt, daß es auf nur eine Bodenhälfte beschränkt ist; es kann jedoch auch eine Länge aufweisen, die weiter zum Eckeinschlag 5 hin vorgezogen ist, diesen jedoch nicht erreicht, da auf das Teilstück 2a des Klebstoffauftrags 2 des Eckeinschlags 5 eine schlauchförmige Ventileinlage 13 aufgeklebt ist. Die Ventileinlage 13 bildet bei dem dargestellten Beispiel ein an sich bekanntes Außentaschenventil mit einer Manschette 14. Durch die in das Sackinnere einmündende Ventileinlage 13 erfolgt die Befüllung des Sackes, wobei nach der Befüllung der äußere Teil 15 der Ventileinlage 13 in eine mit Hilfe der Manschette 14 gebildete Außentasche als Ventilverschluß eingesteckt wird.The design of the valve base 4 differs from that of the base 3 in that the inner base sheet 10 'is shortened in length so that it is only glued to the portion 2a of the adhesive application 2 in the area of the corner wrap 6. In the example shown is the bottom sheet 10 'shortened in length to such an extent that it is limited to only one half of the bottom; however, it can also have a length which is further drawn towards the corner wedge 5, but which does not reach it, since a tubular valve insert 13 is glued onto the section 2a of the adhesive application 2 of the corner wedge 5. In the example shown, the valve insert 13 forms an outer pocket valve with a sleeve 14, which is known per se. The valve insert 13 which opens into the inside of the sack fills the sack, with the outer part 15 of the valve insert 13 being filled with the aid of the sleeve 14 after filling formed outer pocket is inserted as a valve closure.

Zum Schließen der offenen Formböden 3 und 4 nach Fig. 1 werden die Bodenseitenumschläge 7 und 8 beider Böden 3 und 4 um die Bodenseitenfalzlinien 9 einwärtsgefaltet, wie es in Fig. 2 dargestellt ist. Dabei wird das Bodenblatt 10, 10', das dünner als das Folienmaterial des Sackschlauches 1 gewählt ist, gemeinsam mit den Bodenseitenumschlägen 7 und 8 umgefaltet. In die Bodenseitenumschläge 7 und 8 sind dreieckige Endbereiche 16 der Eckeinschläge 5 und 6 unter Ausbildung von Faltkanten 17 zwischen den Eckeinschlägen 5, 6 und den Bodenseitenumschlägen 7, 8 einbezogen. Durch das auf die Eckeinschläge 5 und 6 im Standboden 3 und auf den Eckeinschlag 6 im Ventilboden 4 aufgeklebte, gemeinsam mit den Bodenseitenumschlägen 7, 8 umgefaltete dünne Bodenblatt 10, 10' ist eine satte Verklebung entlang den Innenseiten der Faltkanten 17 erreicht, so daß hier undichte Kanäle zwischen den Eckeinschlägen 5, 6 und den Bodenseitenumschlägen 7, 8 vermieden sind.To close the open mold trays 3 and 4 according to FIG. 1, the base side flaps 7 and 8 of both trays 3 and 4 are folded inward about the base side fold lines 9, as shown in FIG. 2. The bottom sheet 10, 10 ', which is selected to be thinner than the film material of the bag tube 1, is folded over together with the bottom side envelopes 7 and 8. Triangular end regions 16 of the corner folds 5 and 6 are included in the bottom side envelopes 7 and 8 to form folded edges 17 between the corner folds 5, 6 and the bottom side envelopes 7, 8. Due to the thin bottom sheet 10, 10 'glued to the corner inserts 5 and 6 in the stand base 3 and to the corner insert 6 in the valve base 4, folded over together with the bottom side envelopes 7, 8, a satisfactory bond is achieved along the inner sides of the folded edges 17, so that here leaky channels between the corner turns 5, 6 and the bottom side turns 7, 8 are avoided.

Bei dem Ausführungsbeispiel nach den Fig. 1 bis 3 ist die Breite des Bodenblattes 10, 10' so gewählt, daß die gemeinsam mit den Bodenseitenumschlägen 7 und 8 entlang den Falzlinien 9 einwärts umgefalteten Seitenteile 10a und 10b des Bodenblattes 10,10' sich mit ihren einander zugewandten Randbereichen gegenseitig überlappen. Hierdurch ist eine Verstärkung entlang der Bodenmitte erreicht.In the embodiment according to FIGS. 1 to 3, the width of the base sheet 10, 10 'is selected such that the side parts 10a and 10b of the base sheet 10, 10' folded inwards together with the base side envelopes 7 and 8 along the fold lines 9 align with them mutually facing edge areas overlap each other. This results in a reinforcement along the center of the floor.

Abschließend wird auf die Formböden 3 und 4 mit ihren einwärtsgefalteten Bodenseitenumschlägen 7 und 8 gemäß Fig. 2 ein äußeres Deckblatt 18 aufgeklebt, das zu diesem Zweck auf seiner Unterseite einen Klebstoffauftrag trägt. Mittels dieses unterseitigen Klebstoffauftrags, der wie der eingangs erwähnte Klebstoffauftrag 2 von einem weich und klebrig eingestellten Klebstoff gebildet ist, erfolgt eine abschließende Verklebung des Bodenblattes 18 nicht nur mit den in den Fig. 2 und 3 nicht dargestellten Teilstücken 2b der Klebstoffaufträge 2 auf der Außen- bzw. Oberseite der Bodenseitenumschläge 7 und 8, sondern auch mit sämtlichen, klebstofffreien Bereichen der Bodenseitenumschläge 7 und 8 sowie mit den ihrerseits von Klebstoffaufträgen freigehaltenen, für eine Verklebung mit dem Deckblatt 18 dargebotenen Bereichen des inneren Bodenblattes 10, 10' und der Eckeinschläge 5, 6 bzw. der Ventileinlage 13. In Bodenlängsrichtung überragt dabei das Deckblatt 18 mit seinen Endteilen 19 die Randkanten des inneren Bodenblattes 10 im Bereich der Eckeinschläge 5 und 6 des Standbodens 3 bzw. die Randkante des inneren Bodenblattes 10' im Bereich des Eckeinschlags 6 des Ventilbodens 4, wobei hier der andere Endteil 19 des Deckblatts 18 auf die Oberseite der Ventileinlage 13 aufgeklebt ist. Das Deckblatt 18 kann seinerseits eine geringere Dicke als das Folienmaterial des Sackschlauchs 1 aufweisen, so daß es eine gute Anschmiegsamkeit an die Materiallagen im jeweiligen Formboden 3, 4 im Interesse einer vollflächigen, dichten Verklebung besitzt. Das Ausführungsbeispiel nach Fig. 4 bis 6 unterscheidet sich von dem nach den Fig. 1 bis 3 durch eine andere Ausgestaltung des Ventilbodens 4. Für gleiche bzw. entsprechende Teile sind dabei die gleichen Bezugszeichen wie im Falle des Ausführungsbeispiels nach den Fig. 1 bis 3 verwendet worden.Finally, an outer cover sheet 18 is glued onto the molded trays 3 and 4 with their inwardly folded bottom side envelopes 7 and 8, which for this purpose carries an adhesive application on its underside. By means of this adhesive application on the underside, which, like the adhesive application 2 mentioned at the outset, is formed by a soft and tacky adhesive, the bottom sheet 18 is finally bonded not only to the sections 2b of the adhesive applications 2, not shown in FIGS. 2 and 3, on the outside - or top of the bottom side envelopes 7 and 8, but also with all adhesive-free areas of the bottom side envelopes 7 and 8 and with the areas of the inner bottom sheet 10, 10 'and the corner folds 5 provided for adhesive bonding with the cover sheet 18 , 6 or the valve insert 13. In the longitudinal direction of the floor, the cover sheet 18 projects with its end parts 19 over the edge edges of the inner base sheet 10 in the area of the corner folds 5 and 6 of the base 3 or the edge edge of the inner base sheet 10 'in the area of the corner fold 6 Valve bottom 4, here the other end part 19 of Dec kblatts 18 is glued to the top of the valve insert 13. The cover sheet 18 can in turn have a smaller thickness than the film material of the bag hose 1, so that it has a good conformability to the material layers in the respective mold base 3, 4 in the interest of a full-surface, tight adhesive bond. The embodiment according to FIGS. 4 to 6 differs from that according to FIGS. 1 to 3 by a different design of the valve base 4. For the same or corresponding parts, the same reference numerals are used as in the case of the embodiment according to FIGS. 1 to 3 been used.

Wie insbesondere aus Fig. 4 ersichtlich ist, ist auf das Teilstück 2a des Klebstoffauftrags 2 eine schlauchförmige Ventileinlage 20 mittig auf den Eckeinschlag 5 aufgeklebt, die mit ihrem inneren Bereich 21 über die innere Randkante des Eckeinschlags 5 hinausgeführt ist und in das Sackinnere hineinragt. Die Ventileinlage 20 bildet dabei ein sog. Innenventil, dessen innerer Bereich 21 nach Befüllung des Sackes mit Füllgut einen selbsttätigen Ventilverschluß bewirkt.As can be seen in particular from FIG. 4, a tubular valve insert 20 is glued in the middle to the corner wrap 5 on the portion 2a of the adhesive application 2, the inner region 21 of which extends beyond the inner edge of the corner wrap 5 and projects into the interior of the sack. The valve insert 20 forms a so-called inner valve, the inner region 21 of which causes an automatic valve closure after the bag has been filled with filling material.

Die schlauchförmige Ventileinlage 20, die z. B. von einem nahtlos extrudierten, dünnen Schlauchstück aus Kunststoffolie gebildet ist, ist als Flachschlauch auf den Eckeinschlag 5 aufgeklebt und trägt auf ihrer Oberseite bzw. der oberen Flachschlauchhälfte außenseitig einen Klebstoffauftrag 22, der in seiner Beschaffenheit dem Klebstoffauftrag 2 entspricht. Es ist sodann ein klebstofffreies Bodenblatt 10 von der gleichen Größe wie das Bodenblatt 10 des Standbodens 3 in den offenen Ventilboden 4 eingeklebt, wobei seine Verklebung im Bereich des Eckeinschlags 6 mit dem Teilstück 2a des Klebstoffauftrags 2 und im Bereich des Eckeinschlags 5 mit den Bereichen des Teilstücks 2a beidseits der Ventileinlage 20 und im dazwischenliegenden Bereich mit dem Klebstoffauftrag 22 der Ventileinlage 20 erfolgt.The tubular valve insert 20, the z. B. is formed from a seamlessly extruded, thin piece of tubing made of plastic film, is glued as a flat tube on the corner wrap 5 and carries on its top or the upper half of the flat tube on the outside an adhesive application 22, which corresponds in its nature to the adhesive application 2. There is then an adhesive-free base sheet 10 of the same size as the base sheet 10 of the base 3 glued into the open valve base 4, its gluing in the area of the corner wrap 6 with the portion 2a of the adhesive application 2 and in the area of the corner wrap 5 with the areas of Part 2a takes place on both sides of the valve insert 20 and in the area in between with the adhesive application 22 of the valve insert 20.

Eine weitere Abwandlung des ersten Ausführungsbeispiels ist dadurch vorgenommen, daß die Breite des Bodenblattes 10 sowohl im Standboden 3 als auch im Ventilboden 4 derart bemessen ist, daß die gemeinsam mit den Bodenseitenumschlägen 7 und 8 umgefalteten Seitenteile 10a und 10b des Bodenblattes 10 im geschlossenen Boden gemäß Fig. 5 mit ihren einander zugewandten Randkanten 23 und 24 im Abstand zueinander angeordnet sind. Hierdurch ist im geschlossenen Formboden 3, 4 eine Lagenstaffelung zwischen den Bodenseitenumschlägen 7 und 8 zur Bodenmitte hin erreicht, die sich durch eine verbesserte Anlegemöglichkeit für das abschließend auf die geschlossenen Formböden 3, 4 aufgebrachte Deckblatt 18 günstig auf die Dichtigkeit der mittels des Deckblatts 18 abschließend herbeigeführten Verklebung auswirkt.A further modification of the first embodiment is made in that the width of the base sheet 10 in both the stand base 3 and in the valve base 4 is dimensioned such that the side parts 10a and 10b of the base sheet 10 folded over together with the base side envelopes 7 and 8 in the closed base according to 5 with their mutually facing edge edges 23 and 24 are arranged at a distance from one another. As a result, in the closed mold base 3, 4, a layer gradation between the bottom side envelopes 7 and 8 towards the center of the base is achieved, which, due to an improved application possibility for the cover sheet 18 finally applied to the closed mold bases 3, 4, is beneficial to the tightness of the cover sheet 18 by means of the cover sheet 18 induced bonding affects.

Claims (7)

1. A valve bag of plastics sheet, consisting of a bag tube (1) closed at its ends by a bottom and a valve end, the ends of the bag each being formed by a shaped end (3; 4) which comprises corner turn-ins (5, 6) situated opposite one another in pairs and lateral turn-overs (7, 8) of the ends, an inner end sheet (10, 10') and an outer cover sheet (18) as well as a valve insert (13; 20) in the valve end, all these parts forming the shaped ends (3; 4), including the outer cover sheet (18) consisting of the plastics sheet and being connected to one another to form the ends by adhesive connections which comprise applications (2) of adhesive extending all round the outside of the bag tube (1) along its marginal 'edge and applications of adhesive at the inside of the cover sheet (18), characterised in that the applications of adhesive are of pressure-sensitive adhesive type in such a manner that the adhesive adheres not only to itself but also to regions free of adhesive, the width of each lateral turn-over (7, 8) of the end, measured in the transverse direction of the shaped end (3; 4), is less than half the width of the relevant shaped end in its finished state, and the inner end sheet (10; 10'), which itself is kept free of applications of adhesive, is bonded by the application of adhesive (2) to at least one of the corner turn-ins (5, 6) of the shaped end and has a width exceeding the width of the finished shaped end and the combined widths of the lateral turn-overs of the ends.
2. A valve bag according to Claim 1, characterised in that the lateral portions (10a, 10b) of the bottom sheet (10), which are folded over jointly with the lateral turn-overs (7, 8) of the end, are arranged with their adjacent marginal edges (23, 24) spaced apart from one another.
3. A valve bag according to Claim 1, characterised in that the lateral portions (10a, 10b) of the end sheet (10; 10') which are folded over jointly with the lateral turn-overs (7, 8) of the end, overlap mutually with their adjacent marginal regions.
4. A valve bag according to any one of Claims 1 to 3, characterised in that the end sheet (10,10') is thinner than the material of the bag tube (1).
5. A valve bag according to any one of Claims 1 to 4, characterised in that, in the valve end (4), a tubular valve insert (13) is bonded to one (5) of the two corner turn-ins (5, 6) by the application of adhesive (2), and the end sheet (10') is shortened in length measured in the longitudinal direction of the end and is bonded by the application of adhesive (2) of the other, opposite corner turn-in (6).
6. A valve bag according to any one of Claims 1 to 4, characterised in that, in the valve end (4), a tubular valve insert (20) is bonded by the application of adhesive (2) to one (5) of the two corner turn-ins (5, 6) and the valve insert in turn carries, at its upper side, an application of adhesive (22) whereby one end of the end sheet (10) is bonded, the other end of which is bonded by an application of adhesive (2) of the other, opposite corner turn-in (6).
7. A valve bag according to any one of Claims 1 to 6, characterised in that the outer cover sheet (8) projects beyond the marginal edge of the end sheet (10, 10') in the region of the corner turn-ins (5, 6) and is bonded, by means of its application of adhesive at the under side, in the region between the lateral turn-overs (7, 8) of the end, to the end sheet (10; 10') and to a region, free of adhesive, of the relevant corner turn-in (5, 6) and possibly of the valve insert (13; 20).
EP84114516A 1983-12-28 1984-11-30 Valve bag made of plastic material Expired EP0146819B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8337443U DE8337443U1 (en) 1983-12-28 1983-12-28 Valve bag made of plastic film
DE8337443U 1983-12-28

Publications (3)

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EP0146819A2 EP0146819A2 (en) 1985-07-03
EP0146819A3 EP0146819A3 (en) 1986-11-05
EP0146819B1 true EP0146819B1 (en) 1989-04-12

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US (1) US4637062A (en)
EP (1) EP0146819B1 (en)
DE (2) DE8337443U1 (en)
ES (1) ES283621U (en)
PT (1) PT79754A (en)

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DE102007015099A1 (en) * 2007-03-29 2008-10-02 Construction Research & Technology Gmbh Paper valve bag with inner latch
DE102008017446A1 (en) * 2008-04-03 2009-10-15 Windmöller & Hölscher Kg Apparatus and method for producing sacks
DE202009003080U1 (en) * 2009-03-04 2009-04-30 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh paper bags
WO2012025413A2 (en) * 2010-08-25 2012-03-01 Windmöller & Hölscher Kg Sack and method and device for producing sacks
DE202017001357U1 (en) * 2017-03-13 2018-06-14 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Multi-layer valve bag
DE202021102384U1 (en) * 2021-05-04 2022-08-05 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Bag for bulk goods
DE102021128582A1 (en) 2021-11-03 2023-05-04 Urs Lendenmann Collapsible container with carrying handle, carrying handle for a collapsible container and use of a collapsible container as sports equipment

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Also Published As

Publication number Publication date
DE8337443U1 (en) 1984-02-02
ES283621U (en) 1985-05-16
DE3477656D1 (en) 1989-05-18
PT79754A (en) 1985-01-01
EP0146819A3 (en) 1986-11-05
US4637062A (en) 1987-01-13
EP0146819A2 (en) 1985-07-03

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