EP0012874B1 - Method for sealing the valve of a packing container - Google Patents

Method for sealing the valve of a packing container Download PDF

Info

Publication number
EP0012874B1
EP0012874B1 EP79104795A EP79104795A EP0012874B1 EP 0012874 B1 EP0012874 B1 EP 0012874B1 EP 79104795 A EP79104795 A EP 79104795A EP 79104795 A EP79104795 A EP 79104795A EP 0012874 B1 EP0012874 B1 EP 0012874B1
Authority
EP
European Patent Office
Prior art keywords
valve
sealing
channel
bag
fluid
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
EP79104795A
Other languages
German (de)
French (fr)
Other versions
EP0012874A1 (en
Inventor
Klaus Dr.-Ing. Domke
Walter Saur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to AT79104795T priority Critical patent/ATE813T1/en
Publication of EP0012874A1 publication Critical patent/EP0012874A1/en
Application granted granted Critical
Publication of EP0012874B1 publication Critical patent/EP0012874B1/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling

Definitions

  • the invention relates to a method for sealing a packaging container valve according to the preamble of the main claim.
  • a method of this type known for example from FR-A-13 60 753
  • a valve closure is produced on bags made of plastic film by welding the two layers of film while leaving a channel.
  • the area of the film surface delimiting the channel is moistened with a liquid before the valve closure is formed by welding the film layers. Since the liquids in question cannot always be applied as uniform strips and, if the application is too thick, they flow away when the foils are pressed together for welding, and since these liquids prevent a welded joint, it is difficult to produce valve channels with specific dimensions that relate to a specific one Have the response pressure set.
  • the sealing method according to the invention with the characterizing feature of the main claim has the advantage that tight valve channels can be manufactured with the required accuracy. Furthermore, the metering of the liquid sealant is easier since the liquid applied at the end of the channel is distributed throughout the valve channel by capillary action and even forms a small reserve at the other end. A major advantage can also be seen in the fact that the sealant can be introduced into the valve regardless of the time at which it is formed. This is the case, for example, when valve bags are made in stock, which are then closed after filling by a simple, continuous night of closure and whose valve channel is sealed with a liquid sealant immediately before or after filling, so that evaporation of the sealant during Storage of the bags is avoided.
  • the method according to the invention can also be used to seal, for example, valves known from US Pat. No. 2,946,502, which are manufactured separately from the packaging containers and are only glued to them later.
  • These known valves consist of a perforated base plate and a flexible foil plate covering this, which is glued to the base plate along two opposite edge regions, so that the non-adhesive central region delimits a valve channel starting from the opening in the base plate.
  • the subsequent sealing is particularly advantageous since the liquid sealant cannot migrate into the adhesive layer while the valves are being stored.
  • the implementation of the method according to the invention is seen particularly in connection with the packaging of roasted coffee.
  • Coffee is filled into bags in the absence of air and sealed airtight.
  • the gases released from the coffee can escape through a valve glued to the bag above an opening.
  • valves which have one or more ventilation channels, are glued in the packaging machine to the bags or to the packaging material from which the bags are formed.
  • a small amount of silicone oil is applied to the valve in the area of the free end of the valve channel.
  • the liquid can also be sprayed as a drop through a nozzle onto the free end of the valve channel. Due to capillary action, the somewhat excess silicone oil is drawn into the valve channel and fills it. As has been shown, even a small part is deposited on the other end of the valve channel facing the inside of the bag.
  • the silicone oil in the valve channels fills the tiny cavities caused by the grain of the surface of the walls of the valve channels and thus seals the valve channel against the penetration of air from the atmosphere. If the pressure inside a bag pack increases due to the development of gas, the flexible film is lifted off the base plate of the valve in the area of the valve channel, the silicone oil film being split. After the excess pressure in the inside of the bag has been released by the release of a quantity of gas, the flexible film rests on the base plate, so that the two films adhering to the surfaces reunite and the sealing effect reappears.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Closures For Containers (AREA)
  • Vacuum Packaging (AREA)
  • Safety Valves (AREA)
  • Closing Of Containers (AREA)

Abstract

Method of manufacturing a filled packaging container comprising the steps of forming a bag on a mandrel, connecting a seam provided in a formed bag, forming a hole on an upper side of the bag and inserting a valve into the hole to provide an air pressure release after filling the container with a material. Two opposite edges of the valve are formed with two flexible portions made of foil. A sealing fluid is applied in the channel to provide a fluid film to connect the foil portions.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren zum Abdichten eines Verpackungsbehälterventils nach der Gattung des Hauptanspruchs. Bei einem beispielsweise durch die FR-A-13 60 753 bekannten Verfahren dieser Art wird an Beuteln aus Kunststoffolie ein Ventilverschluß durch Verschweißen der beiden Folienlagen unter Belassung eines Kanals erzeugt. Zum Abdichten dieses Kanals wird der den Kanal begrenzende Bereich der Folienoberfläche mit einer Flüssigkeit befeuchtet bevor der Ventilverschluß durch Verschweißen der Folienlagen gebildet wird. Da die infrage kommenden Flüssigkeiten sich nicht immer als gleichmäßige Streifen auftragen lassen und bei einem zu dicken Auftrag beim Aufeinanderpressen der Folien zum Verschweißen wegfließen, und da diese Flüssigkeiten eine Schweißverbindung verhindern, ist es schwierig, Ventilkanäle mit bestimmten Abmessungen herzustellen, die sich auf einen bestimmten Ansprechdruck einstellen lassen.The invention relates to a method for sealing a packaging container valve according to the preamble of the main claim. In a method of this type, known for example from FR-A-13 60 753, a valve closure is produced on bags made of plastic film by welding the two layers of film while leaving a channel. To seal this channel, the area of the film surface delimiting the channel is moistened with a liquid before the valve closure is formed by welding the film layers. Since the liquids in question cannot always be applied as uniform strips and, if the application is too thick, they flow away when the foils are pressed together for welding, and since these liquids prevent a welded joint, it is difficult to produce valve channels with specific dimensions that relate to a specific one Have the response pressure set.

Durch die DE-A2643831 ist ferner ein auslaufsicheres Verschließen von Füllventilen an Ventilsäcken nach dem Befüllen bekannt. Hierbei wird auf die bei Zugabe von Wasser klebrig werdenden Innenteile des weit geöffneten Füllventils Wasser oder Wasserdampf aufgespritzt oder aufgesprüht und darauf das Füllventil zum Verkleben zusammengedrückt.From DE-A2643831 leak-proof closing of filling valves on valve bags after filling is also known. Here, water or steam is sprayed or sprayed onto the internal parts of the wide-open filling valve, which become sticky when water is added, and the filling valve is pressed together for gluing.

Verfahren nach der ErfindungMethod according to the invention

Das erfindungsgemäße Abdichtverfahren mit dem kennzeichnenden Merkmal des Hauptanspruches hat demgegenüber den Vorteil, daß dichte Ventilkanäle mit der erforderlichen Genauigkeit hergestellt werden können. Ferner ist die Dosierung des flüssigen Dichtmittels einfacher, da sich die am Ende des Kanals aufgetragene Flüssigkeit durch Kapillarwirkung im ganzen Ventilkanal verteilt und sogar am anderen Ende noch eine kleine Reserve bildet. Ein wesentlicher Vorteil ist aber auch darin zu erkennen, daß das Dichtmittel unabhängig vom Zeitpunkt der Bildung des Ventils in dieses eingebracht werden kann. Dies ist beispielsweise der Fall, wenn Ventilbeutel auf Vorrat gefertigt werden, die dann nach dem Füllen durch eine einfache, durchgehende Verschlußnacht verschlossen werden und deren Ventilkanal unmittelbar vor oder nach dem Befüllen mit einem flüssigen Dichtmittel abgedichtet wird, so daß ein Verdunsten des Dichtmittels während der Lagerung der Beutel vermieden wird.The sealing method according to the invention with the characterizing feature of the main claim has the advantage that tight valve channels can be manufactured with the required accuracy. Furthermore, the metering of the liquid sealant is easier since the liquid applied at the end of the channel is distributed throughout the valve channel by capillary action and even forms a small reserve at the other end. A major advantage can also be seen in the fact that the sealant can be introduced into the valve regardless of the time at which it is formed. This is the case, for example, when valve bags are made in stock, which are then closed after filling by a simple, continuous night of closure and whose valve channel is sealed with a liquid sealant immediately before or after filling, so that evaporation of the sealant during Storage of the bags is avoided.

Nach dem erfindungsgemäßen Verfahren lassen sich auch durch beispielsweise die US-A-2946502 bekannte Ventile abdichten, welche getrennt von den Verpackungsbehältern hergestellt und erst später auf diese aufgeklebt werden. Diese bekannten Ventile bestehen aus einer gelochten Grundplatte und einem sich mit dieser deckenden nachgiebigen Folienplättchen, das entlang zweier gegenüberliegender Randbereiche mit der Grundplatte verklebt ist, so daß der nicht klebende mittlere Bereich einen vom Durchbruch in der Grundplatte ausgehenden Ventilkanal begrenzt. Bei solchen geklebten Ventilen ist die nachträgliche Abdichtung besonders vorteilhaft, da das flüssige Dichtmittel während der Bevorratung der Ventile nicht in die Klebstoffschicht imigrieren kann.The method according to the invention can also be used to seal, for example, valves known from US Pat. No. 2,946,502, which are manufactured separately from the packaging containers and are only glued to them later. These known valves consist of a perforated base plate and a flexible foil plate covering this, which is glued to the base plate along two opposite edge regions, so that the non-adhesive central region delimits a valve channel starting from the opening in the base plate. With such glued valves, the subsequent sealing is particularly advantageous since the liquid sealant cannot migrate into the adhesive layer while the valves are being stored.

Als besonders geeignetes Dichtmittel hat sich bei Versuchen Silikonöl gezeigt.In tests, silicone oil has proven to be a particularly suitable sealant.

Die Durchführung des erfindungsgemäßen Verfahrens wird besonders im Zusammenhang mit dem Verpacken von geröstetem Kaffee gesehen. Kaffee wird unter Luftausschluß in Beutel eingefüllt und dieser luftdicht verschlossen. Die sich aus dem Kaffee lösenden Gase können durch ein am Beutel über einem Durchbruch angeklebtes Ventil entweichen.The implementation of the method according to the invention is seen particularly in connection with the packaging of roasted coffee. Coffee is filled into bags in the absence of air and sealed airtight. The gases released from the coffee can escape through a valve glued to the bag above an opening.

Die Ventile, die einen oder mehrere Entlüftungskanäle aufweisen, werden in der Verpackungsmaschine auf die Beutel oder auf den Packstoff, aus dem die Beutel geformt werden, aufgeklebt. Vor dem Befüllen oder auch kurz danach wird Silikonöl im Bereich des freien Endes des Ventilkanals auf das Ventil in geringer Menge aufgetragen. Dazu dient ein mit Silikonöl getränkter Pinsel, Docht oder Tupfer. Die Flüssigkeit kann auch als Tropfen durch eine Düse auf das freie Ende des Ventilkanals aufgespritzt werden. Durch Kapillarwirkung zieht das etwas im Überfluß aufgetragene Silikonöl in den Ventilkanal ein und füllt diesen aus. Wie sich gezeigt hat, lagert sich sogar ein geringer Teil am anderen, dem Beutelinnern zugekehrten Ende des Ventilkanals ab.The valves, which have one or more ventilation channels, are glued in the packaging machine to the bags or to the packaging material from which the bags are formed. Before filling or shortly thereafter, a small amount of silicone oil is applied to the valve in the area of the free end of the valve channel. Use a brush, wick or swab soaked with silicone oil. The liquid can also be sprayed as a drop through a nozzle onto the free end of the valve channel. Due to capillary action, the somewhat excess silicone oil is drawn into the valve channel and fills it. As has been shown, even a small part is deposited on the other end of the valve channel facing the inside of the bag.

Das in den Ventilkanälen befindliche Silikonöl füllt die winzigen, durch Körnung der Oberfläche der Wände der Ventilkanäle hervorgerufenen Hohlräume aus und dichtet so den Ventilkanal gegen das Durchdringen von Luft aus der Atmosphäre ab. Bei durch Gasentwicklung steigendem Druck im Innern einer Beutelpackung wird im Bereich des Ventilkanals die nachgiebige Folie von der Grundplatte des Ventils abgehoben, wobei der Silikonölfilm gespalten wird. Nach Abbau des Überdrucks im Beutelinnern durch Entströmen einer Gasmenge, legt sich die nachgiebige Folie wieder auf die Grundplatte, so daß die beiden an den Oberflächen haftenden Filme sich wieder vereinigen und aufs neue die Dichtwirkung eintritt.The silicone oil in the valve channels fills the tiny cavities caused by the grain of the surface of the walls of the valve channels and thus seals the valve channel against the penetration of air from the atmosphere. If the pressure inside a bag pack increases due to the development of gas, the flexible film is lifted off the base plate of the valve in the area of the valve channel, the silicone oil film being split. After the excess pressure in the inside of the bag has been released by the release of a quantity of gas, the flexible film rests on the base plate, so that the two films adhering to the surfaces reunite and the sealing effect reappears.

Claims (3)

1. A method of sealing a valve of a packaging container, the valve comprising two superimposed foil members attached one to each other at opposite edge regions, at least one of the members being flexible, and forming a channel containing fluid sealing means, characterized in that the fluid sealing means is applied to one of the ends of the channel after the valve members have been attached one to each other.
2. A method according to claim 1, characterized in that the liquid sealing fluid is attached by means of a brush, a wick, a tampon or a nozzle.
3. A method according to claim 2, characterized in that the fluid means is applied shortly before or after sealing the filling opening of the packaging container equipped with a valve.
EP79104795A 1978-12-23 1979-12-01 Method for sealing the valve of a packing container Expired EP0012874B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104795T ATE813T1 (en) 1978-12-23 1979-12-01 METHOD OF SEALING A PACKING CONTAINER VALVE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2856021 1978-12-23
DE19782856021 DE2856021A1 (en) 1978-12-23 1978-12-23 METHOD FOR SEALING A PACKAGE CONTAINER VALVE

Publications (2)

Publication Number Publication Date
EP0012874A1 EP0012874A1 (en) 1980-07-09
EP0012874B1 true EP0012874B1 (en) 1982-04-07

Family

ID=6058299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104795A Expired EP0012874B1 (en) 1978-12-23 1979-12-01 Method for sealing the valve of a packing container

Country Status (7)

Country Link
US (2) US4290253A (en)
EP (1) EP0012874B1 (en)
JP (1) JPS5929501B2 (en)
AT (1) ATE813T1 (en)
CA (1) CA1149658A (en)
DE (2) DE2856021A1 (en)
ES (1) ES253698Y (en)

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Also Published As

Publication number Publication date
US4290253A (en) 1981-09-22
DE2856021A1 (en) 1980-07-03
JPS5589071A (en) 1980-07-05
ES253698Y (en) 1981-09-16
JPS5929501B2 (en) 1984-07-20
ATE813T1 (en) 1982-04-15
EP0012874A1 (en) 1980-07-09
CA1149658A (en) 1983-07-12
DE2962478D1 (en) 1982-05-19
USRE32018E (en) 1985-11-05
ES253698U (en) 1981-03-01

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