WO1998032588A1 - Method and device for sealing foil strips - Google Patents

Method and device for sealing foil strips Download PDF

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Publication number
WO1998032588A1
WO1998032588A1 PCT/EP1998/000125 EP9800125W WO9832588A1 WO 1998032588 A1 WO1998032588 A1 WO 1998032588A1 EP 9800125 W EP9800125 W EP 9800125W WO 9832588 A1 WO9832588 A1 WO 9832588A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
film
heating
packaging
hot air
Prior art date
Application number
PCT/EP1998/000125
Other languages
German (de)
French (fr)
Inventor
Martin Reitze
Gernot Becker
Klaus-Dieter Kirsch
Original Assignee
Tiromat Krämer + Grebe GmbH & Co. KG
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 Tiromat Krämer + Grebe GmbH & Co. KG filed Critical Tiromat Krämer + Grebe GmbH & Co. KG
Priority to AU59874/98A priority Critical patent/AU5987498A/en
Publication of WO1998032588A1 publication Critical patent/WO1998032588A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7858—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus characterised by the feeding movement of the parts to be joined
    • B29C65/7888—Means for handling of moving sheets or webs
    • B29C65/7894—Means for handling of moving sheets or webs of continuously moving sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81465—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • B29C66/91445—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile by steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms

Definitions

  • the present invention relates to a method and the corresponding device for sealing film webs, in particular for producing film / tubular bag packaging, in which the film webs are guided at least once during the sealing process.
  • This sealing process has the advantage that the sealing seams that are formed during the sealing process are smoother and therefore on the one hand more attractive and on the other hand have no leaks. Furthermore, this type of sealing can also achieve significantly higher processing speeds when sealing.
  • the food such as bread or sausages
  • the film is then sealed in one or more places; ie the parts of the film web to be connected are heated and pressed together so that gastight sealing seams are obtained.
  • the so-called transverse sealing seams which are perpendicular to the running direction of the product to be packaged, are applied discontinuously
  • the so-called longitudinal sealing seams which are arranged in the running direction of the film web of the product to be packaged, are sealed continuously.
  • the areas of the film web to be connected no longer lie exactly on top of one another during the subsequent pressing, so that the resulting longitudinal sealing seam is wrinkled, has an uneven width and, under certain circumstances, has air pockets.
  • the sealing seam is so thin that the packaging leaks or becomes leaky. The warps increase with increasing packaging, ie sealing speed.
  • the present invention is therefore based on the object of providing a sealing method and a device, by means of which the sealing of longitudinal seams and the devices required for this purpose are changed so that the longitudinal sealing seams without warping and defects at the high sealing speeds which are common for modern packaging machines are can be produced.
  • the object is achieved in that the process for continuously sealing film webs by heating and compressing the film webs is designed such that the overlapping areas of the film webs to be sealed are heated, preferably stepwise, several times during the sealing phase and are guided at least once in between .
  • heating step by step means that the temperature is increased step-by-step depending on the film or packaging speed up to the final sealing temperature.
  • the heating and guiding of the sealing seam area of the film web take place sequentially, the sealing seam area of the film first being heated.
  • the inventive method performed the areas of the films to be sealed 1-6 times, particularly preferably 2-4 times during the sealing phase.
  • the sealing seam area of the film web can be heated with any type of heat supply by the method according to the invention, but heating with hot air is preferred.
  • the heating should be carried out in such a way that it is relatively low at the beginning of the sealing phase and then increases with increasing running length of the sealing area of the film, preferably depending on the film running or packaging speed, until the desired sealing temperature is reached.
  • the method according to the invention is preferably used for the production of longitudinal seal seams of packaging.
  • the method for producing longitudinal sealing seams of tubular film packaging as is often the case for packaging food, such as Bread, sausages, cakes, sandwiches, or other items needed to be used.
  • the method according to the invention can be carried out particularly well by means of a sealing device according to the invention, which has heating elements for heating and in between at least one guide element for guiding the overlapping areas of the film web to be sealed.
  • the heating and guide elements are attached sequentially in the device according to the invention, the device according to the invention preferably having 1-6, particularly preferably 2-4 guide elements. When viewed in the direction of travel of the film web, a heating element is always installed first.
  • the distance between two guide elements in the device according to the invention in the machine running direction should preferably be between 20 and 70 mm, a distance between 30 and 50 mm being particularly preferred.
  • non-heated roller pairs are used as preferred guide elements, one roller being attached to each side of the sealing area.
  • the contact pressure of the rolls, the distance between the rolls and their inclination to the film running direction can be set.
  • the rollers are either made of heat-resistant plastic, such as Teflon, or of metal with a sliding coating.
  • the diameter of the rollers should be 10-50 mm, preferably from 15 to 25 mm.
  • Preferred heating elements of the device according to the invention have hot air nozzles, it being possible for a heating element to be equipped with one or more such hot air nozzles which are arranged next to and / or below one another.
  • the nozzles are preferably circular and preferably have a diameter of 1 to 2 mm.
  • the nozzle bores are preferably made perpendicular to the running direction of the film.
  • the air outlet bores can also be made at an angle, at an acute angle to the running direction of the film.
  • it is particularly important that the air is heated by a heating device with a low thermodynamic inertia.
  • a heating coil is preferably used as the heating device.
  • the sealing device according to the invention is preferably part of an automatic packaging machine.
  • Such an automatic packaging machine packs the goods with a thin film of synthetic polymers, preferably gas-tight if necessary.
  • this packaging machine is of the horizontal type and capable of performing a series of packaging steps fully automatically.
  • the film is continuously advanced by a length of the package shape, a bag or tube is formed from this part of the film, the packaging material is filled into the bag or tube and the bag or tube is sealed lengthways and crosswise to produce a preferably gas-tight package .
  • the device is used for the continuous sealing of the longitudinal seam of the bag or tube.
  • the sealing device according to the invention can therefore be used particularly advantageously on horizontally operating automatic tubular bag machines for packaging foods, especially perishable foods such as fresh meat, ham, sausages, bread or cakes.
  • the film web is unwound from the film roll via deflection rolls during the packaging process and formed into a tube with the aid of a folding box.
  • the goods to be packaged are continuously pushed into this prefabricated tube using a horizontally running conveyor belt.
  • the longitudinal seam of the hose is sealed and then the transverse seams are attached by cross sealing.
  • the sealing device according to the invention is used to produce the longitudinal seam.
  • the sealing according to the invention has the advantage that the sealing seams that arise during the sealing are smoother and absolutely tight and have a more uniform width. On the one hand, they are more attractive and, on the other hand, they have no leaks. Furthermore, higher packaging speeds can also be achieved with this type of sealing. In addition, faster adaptation to different packaging speeds is possible.
  • Figure 1 shows the device according to the invention in plan view.
  • the device consists of two identical parts (1 and 2), which have the heating and the guide elements.
  • the overlapping areas of the film web (I) to be sealed run through the sealing device from top to bottom and are first heated by the first heating element (3), in the further course, the overlapping areas of the film web are then guided by the guide element (4), smoothed and pressed together before they are further heated by the second heating element (5).
  • the sealing seam areas of the film web then pass the guide element (6), the heating element (7), the guide element (8), the heating element (9), the guide element (10) and the heating element (11), so heated up to the sealing temperature and completely sealed the device according to the invention to leave.
  • the guide elements (4, 6, 8, and 10) are designed as pairs of rollers with a height that corresponds at least to the width of the longitudinal sealing seam to be produced.
  • the heating elements comprise 2 rows of hot air nozzles which are arranged vertically to the running direction of the film, one row having three to seven hot air nozzles.
  • the hot air nozzles are fed with hot air from the channels (12 and 13), which in turn are connected to the channels (14 and 15), in each of which there is a heating coil (16, 17) for heating the air, as in FIG. 2 shown.
  • Fig. 2 shows the device according to the invention in cross section in the plane A B.
  • the two identical parts (1 and 2) of the device according to the invention have the channels (12 and 13) leading to the hot air nozzles, which in turn with the in the channels ( 14 and 15) with the help of a heating coil (16 and 17) heated air.

Abstract

The invention concerns a method of continuously sealing the longitudinal seams in foil strips by heating and compressing overlapping foil strip regions. According to the invention, during the sealing phase, the foil strip regions to be sealed are heated a plurality of times (3, 5, 7, 9, 11), preferably in steps, and are guided at least once (4, 6, 8, 10) therebetween. The invention also concerns a corresponding sealing device.

Description

Verfahren und Vorrichtung zum Siegeln von FoiienbahnenMethod and device for sealing film webs
Die vorliegende Erfindung betrifft ein Verfahren und die entsprechende Vorrichtung zum Siegeln von Foiienbahnen, insbesondere zum Herstellen von Folien- Schlauchbeutelverpackungen, bei der die Folienbahnen während des Siegelvorgangs mindestens auch einmal geführt werden. Dieses Siegelverfahren hat den Vorteil, daß die bei der Siegelung entstehenden Siegelnähte glatter und damit zum einen ansehnlicher sind und zum anderen keine undichten Stellen aufweisen. Ferner können durch diese Art der Siegelung auch wesentlich höhere Verarbeitungsgeschwindigkeiten beim Siegeln erzielt werden.The present invention relates to a method and the corresponding device for sealing film webs, in particular for producing film / tubular bag packaging, in which the film webs are guided at least once during the sealing process. This sealing process has the advantage that the sealing seams that are formed during the sealing process are smoother and therefore on the one hand more attractive and on the other hand have no leaks. Furthermore, this type of sealing can also achieve significantly higher processing speeds when sealing.
Der Haltbarmachung von Lebensmitteln kommt in der heutigen Zeit eine immer größere Bedeutung zu. Neben der Konservierung durch Tiefkühlung werden auch immer öfter Lebensmittel in gasdichten Folien verpackt. Bei der Verpackung der Lebensmittel in solche Folien werden an die Verpackungsmaschinen zunehmend höhere Anforderungen in Bezug auf die Qualität der Verpackung und an die Verpackungsgeschwindigkeit gestellt.The preservation of food is becoming increasingly important these days. In addition to preservation through deep-freezing, food is increasingly being packed in gas-tight films. When packaging the food in such foils, the packaging machines are subject to increasingly higher demands in terms of the quality of the packaging and the packaging speed.
In der Regel werden die Lebensmittel wie zum Beispiel Brot oder Wurstwaren mit der Folie umhüllt und die Folie wird dann an einer oder mehreren Stellen versiegelt; d.h. die Teile der zu verbindenden Folienbahn werden erwärmt und miteinander verpreßt, so daß gasdichte Siegelnähte erhalten werden. Während die sogenannten Quersiegelnähte, die sich senkrecht zur Laufrichtung des zu verpackenden Produkts befinden, diskontinuierlich angebracht werden, erfolgt die Siegelung der sogenannten Längssiegelnähte, die in der Laufrichtung der Foiienbahn des zu verpackenden Produkts angeordnet sind, fortlaufend. Speziell beim kontinuieriichen Erwärmen einer Folienbahn zur Herstellung einer Längssiegelnaht auf Vorrichtungen und nach Verfahren gemäß dem Stand der Technik hat es in der Vergangenheit immer wieder Probleme gegeben, weil sich die Folienbahnen beim Erwärmen verwerfen d.h. wellen. Durch diese Verwerfungen liegen die zu verbindenden Bereiche der Folienbahn beim anschließenden Verpressen nicht mehr exakt aufeinander, so daß die resultierende Längssiegelnaht faltig ist, eine ungleichmäßige Breite hat und unter Umständen Lufteinschlüsse aufweist. Im Extremfall ist die Siegelnaht so dünn, daß die Verpackungen undicht sind oder werden. Die Verwerfungen erhöhen sich mit zunehmender Verpackungs- d.h. Siegelgeschwindigkeit.As a rule, the food, such as bread or sausages, is wrapped in the film and the film is then sealed in one or more places; ie the parts of the film web to be connected are heated and pressed together so that gastight sealing seams are obtained. While the so-called transverse sealing seams, which are perpendicular to the running direction of the product to be packaged, are applied discontinuously, the so-called longitudinal sealing seams, which are arranged in the running direction of the film web of the product to be packaged, are sealed continuously. Especially in the continuous heating of a film web for producing a longitudinal sealing seam on devices and according to methods according to the prior art, there have always been problems in the past, because the film webs warp during heating. As a result of these faults, the areas of the film web to be connected no longer lie exactly on top of one another during the subsequent pressing, so that the resulting longitudinal sealing seam is wrinkled, has an uneven width and, under certain circumstances, has air pockets. In extreme cases, the sealing seam is so thin that the packaging leaks or becomes leaky. The warps increase with increasing packaging, ie sealing speed.
Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, ein Siegelverfahren und eine Vorrichtung zur Verfügung zu stellen, womit man die Siegelung von Längsnähten und die dazu benötigten Vorrichtungen so ändert, daß die Längssiegelnähte ohne Verwerfungen und Fehlstellen bei den hohen Siegelgeschwindigkeiten, die für moderne Verpackungsmaschinen üblich sind, hergestellt werden können.The present invention is therefore based on the object of providing a sealing method and a device, by means of which the sealing of longitudinal seams and the devices required for this purpose are changed so that the longitudinal sealing seams without warping and defects at the high sealing speeds which are common for modern packaging machines are can be produced.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Verfahren zum kontinuierlichen Siegein von Folienbahnen durch Erwärmen und Zusammenpressen der Folienbahnen, so gestaltet wird, daß die überlappenden Bereiche der zu siegelnden Foiienbahnen während der Siegelphase mehrfach vorzugsweise, stufenweise, erhitzt und dazwischen mindestens auch einmal geführt werden.The object is achieved in that the process for continuously sealing film webs by heating and compressing the film webs is designed such that the overlapping areas of the film webs to be sealed are heated, preferably stepwise, several times during the sealing phase and are guided at least once in between .
Stufenweise erhitzen bedeutet in diesem Zusammenhang, daß die Temperatur stufenförmig in Abhängigkeit von der Folien- bzw. Verpackungs-Geschwindigkeit bis zur abschließenden Siegeltemperatur erhöht wird.In this context, heating step by step means that the temperature is increased step-by-step depending on the film or packaging speed up to the final sealing temperature.
Bei dem erfindungsgemäßen Verfahren erfolgen dabei die Erwärmung und die Führung des Siegelπahtbereichs der Folienbahn sequentiell, wobei der Siegelnahtbereich der Folie zunächst erwärmt wird. Bevorzugt werden bei dem erfindungsgemäßen Verfahren die zu siegelnden Bereiche der Folien während der Siegelphase 1-6 mal, besonders bevorzugt 2-4 mal geführt.In the method according to the invention, the heating and guiding of the sealing seam area of the film web take place sequentially, the sealing seam area of the film first being heated. Are preferred in the The inventive method performed the areas of the films to be sealed 1-6 times, particularly preferably 2-4 times during the sealing phase.
Der Siegelnahtbereich der Folienbahn kann nach dem erfindungsgemäßen Verfahren mit jeder Art von Wärmezufuhr erwärmt werden, wobei die Erwärmung mit heißer Luft jedoch bevorzugt wird. Die Erwärmung sollte so geführt werden, daß sie am Anfang der Siegelphase relativ gering ist und dann mit zunehmender Lauflänge des Siegelbereichs der Folie, vorzugsweise in Abhängigkeit von der Folienlauf- bzw. Verpackungs-Geschwindigkeit, steigt, bis die gewünschte Siegeltemperatur erreicht wird.The sealing seam area of the film web can be heated with any type of heat supply by the method according to the invention, but heating with hot air is preferred. The heating should be carried out in such a way that it is relatively low at the beginning of the sealing phase and then increases with increasing running length of the sealing area of the film, preferably depending on the film running or packaging speed, until the desired sealing temperature is reached.
Das erfindungsgemäße Verfahren wird vorzugsweise zur Herstellung von Längssiegelnähten von Verpackungen eingesetzt. Bevorzugt kann das Verfahren zur Herstellung von Längssiegeinähten von Folien-Schlauchbeutelverpackungen, wie sie häufig zur Verpackung von Lebensmitteln, wie z.B. Brot-, Wurstwaren, Kuchen, Sandwichbroten, oder anderen Artikeln benötigt werden, verwendet werden.The method according to the invention is preferably used for the production of longitudinal seal seams of packaging. Preferably, the method for producing longitudinal sealing seams of tubular film packaging, as is often the case for packaging food, such as Bread, sausages, cakes, sandwiches, or other items needed to be used.
Das erfindungsgemäße Verfahren kann besonders gut mittels einer erfindungsgemäßεn Siegeivorrichtung durchgeführt werden, die Aufheizelemente zum Erwärmen und dazwischen mindestens ein Führungselement zum Führen der überlappenden, zu siegelnden Bereiche der Foiienbahn aufweist.The method according to the invention can be carried out particularly well by means of a sealing device according to the invention, which has heating elements for heating and in between at least one guide element for guiding the overlapping areas of the film web to be sealed.
Die Aufheiz- und die Führungselemente sind bei der erfindungsgemäßen Vorrichtung sequentiell angebracht, wobei die erfindungsgemäße Vorrichtung vorzugsweise 1-6, besonders bevorzugt 2-4 Führungselemente aufweist. In Laufrichtung der Folienbahn betrachtet ist konstruktiv immer zuerst ein Aufheizelement angebracht.The heating and guide elements are attached sequentially in the device according to the invention, the device according to the invention preferably having 1-6, particularly preferably 2-4 guide elements. When viewed in the direction of travel of the film web, a heating element is always installed first.
Der Abstand zwischen zwei Führungselementen sollte bei der erfindungsgemäßen Vorrichtung in Maschinenlaufrichtung vorzugsweise zwischen 20 und 70 mm liegen, wobei ein Abstand zwischen 30 und 50 mm besonders bevorzugt wird. Als bevorzugte Führungselemente werden bei der erfindungsgemäßen Vorrichtung nicht beheizte Rollenpaare verwendet, wobei jeweils an jede Seite des Siegeinahtbereichs eine Rolle angebracht ist. Der Aπpressdruck der Rollen, der Abstand der Rollen zueinander sowie deren Neigung zur Foiienlaufrichtung sind einstellbar. Die Rollen werden entweder aus hitzebeständigem Kunststoff, wie z.B. Teflon, oder aus Metall mit einer Gleitbeschichtung gefertigt. Der Durchmesser der Rollen sollte 10-50 mm, vorzugsweise von 15 bis 25 mm, betragen.The distance between two guide elements in the device according to the invention in the machine running direction should preferably be between 20 and 70 mm, a distance between 30 and 50 mm being particularly preferred. In the device according to the invention, non-heated roller pairs are used as preferred guide elements, one roller being attached to each side of the sealing area. The contact pressure of the rolls, the distance between the rolls and their inclination to the film running direction can be set. The rollers are either made of heat-resistant plastic, such as Teflon, or of metal with a sliding coating. The diameter of the rollers should be 10-50 mm, preferably from 15 to 25 mm.
Bevorzugte Aufheizelemente der erfindungsgemäßeπ Vorrichtung weisen Heißluftdüsen auf, wobei ein Aufheizelement mit einer oder mehreren solcher Heißluftdüsen ausgerüstet sein kann, die neben- und/oder untereinander angeordnet sind. Die Düsen sind vorzugsweise kreisförmig und haben vorzugsweise einen Durchmesser von 1 bis 2 mm.Preferred heating elements of the device according to the invention have hot air nozzles, it being possible for a heating element to be equipped with one or more such hot air nozzles which are arranged next to and / or below one another. The nozzles are preferably circular and preferably have a diameter of 1 to 2 mm.
Vorzugsweise sind die Düsenbohrungen senkrecht zur Laufrichtung der Folie angebracht. Die Luftaustrittsbohrungen können aber auch schräg, in einem spitzen Winkel zur Laufrichtung der Folie angebracht sein. Bei einer erfindungsgemäßen Vorrichtung mit Heißluftdüsen ist besonders wichtig, daß die Luft durch eine Heizvorrichtung mit einer geringen thermodynamischen Trägheit erwärmt wird. Als Heizvorrichtung wird dafür vorzugsweise eine Heizspirale eingesetzt.The nozzle bores are preferably made perpendicular to the running direction of the film. The air outlet bores can also be made at an angle, at an acute angle to the running direction of the film. In a device according to the invention with hot air nozzles, it is particularly important that the air is heated by a heating device with a low thermodynamic inertia. A heating coil is preferably used as the heating device.
Die eriϊndungsgemäße Siegelvorrichtung ist bevorzugt Teil einer automatischen Verpackungsmaschine. Eine solche automatische Verpackungsmaschine verpackt die Waren mit einer dünnen Folie aus synthetischen Polymeren, vorzugsweise gasdicht, wenn notwendig . Typischerweise ist diese Verpackungsmaschine vom Horizontaltyp und in der Lage eine Reihe von Verpackungsschritten vollautomatisch auszuführen. U.a. erfolgt kontinuierlich der Vorschub der Folie um eine Packungsformlänge, das Formen eines Beutels oder Schlauches aus diesem Teil der Folie, das Einfüllen des Verpackungsgutes in den Beutel oder Schlauch und das längs- und querseitige Siegeln des Beutels oder Schlauches zur Herstellung einer vorzugsweise gasdichten Verpackung automatisch. Die erfindungsgemäße Vorrichtung wird dabei zur kontinuierlichen Siegelung der Längsnaht des Beutels oder Schlauches eingesetzt.The sealing device according to the invention is preferably part of an automatic packaging machine. Such an automatic packaging machine packs the goods with a thin film of synthetic polymers, preferably gas-tight if necessary. Typically, this packaging machine is of the horizontal type and capable of performing a series of packaging steps fully automatically. Among other things, the film is continuously advanced by a length of the package shape, a bag or tube is formed from this part of the film, the packaging material is filled into the bag or tube and the bag or tube is sealed lengthways and crosswise to produce a preferably gas-tight package . The invention The device is used for the continuous sealing of the longitudinal seam of the bag or tube.
Die erfindungsgemäße Siegelvorrichtung kann daher besonders vorteilhaft auf horizontal arbeitenden automatischen Schlauchbeutelmaschinen zur Verpackung von Lebensmitteln, speziell verderblichen Lebensmitteln wie Frischfleisch, Schinken, Wurst, Brot oder Kuchen eingesetzt werden.The sealing device according to the invention can therefore be used particularly advantageously on horizontally operating automatic tubular bag machines for packaging foods, especially perishable foods such as fresh meat, ham, sausages, bread or cakes.
Dazu wird die Folienbahn wird von der Folienrolle über Umlenkrollen während des Verpackungsvorgangs abgespult und mit Hilfe eines Faltkastens zu einem Schlauch geformt. In diesen vorgefertigten Schlauch werden die zu verpackenden Güter mit Hilfe eines horizontal laufenden Förderbands kontinuierlich eingeschoben. Gleichzeitig wird die Längsnaht des Schlauches gesiegelt und anschließend die Quernähte durch Quersiegelung angebracht. Zur Herstellung der Längsnaht wird die erfindungsgemäße Siegelvorrichtung eingesetzt.For this purpose, the film web is unwound from the film roll via deflection rolls during the packaging process and formed into a tube with the aid of a folding box. The goods to be packaged are continuously pushed into this prefabricated tube using a horizontally running conveyor belt. At the same time, the longitudinal seam of the hose is sealed and then the transverse seams are attached by cross sealing. The sealing device according to the invention is used to produce the longitudinal seam.
Die erfindungsgemäße Siegelung hat den Vorteil, daß die bei der Siegelung entstehenden Siegelnähte glatter und absolut dicht sind und eine gleichmäßigere Breite haben. Damit sind sie zum einen ansehnlicher und weisen zum anderen keine undichten Stellen auf. Ferner können durch diese Art der Siegelung auch höhere Verpackungsgeschwindigkeiten erzielt werden. Außerdem ist eine raschere Anpassung an unterschiedliche Verpackungsgeschwindigkeiten möglich.The sealing according to the invention has the advantage that the sealing seams that arise during the sealing are smoother and absolutely tight and have a more uniform width. On the one hand, they are more attractive and, on the other hand, they have no leaks. Furthermore, higher packaging speeds can also be achieved with this type of sealing. In addition, faster adaptation to different packaging speeds is possible.
Die Erfindung wird u.a. im folgenden anhand der Figur 1 und Figur 2 erläutert.The invention will i.a. explained below with reference to Figure 1 and Figure 2.
Figur 1 zeigt die erfindungsgemäße Vorrichtung in Draufsicht. Die Vorrichtung besteht aus zwei baugleichen Teilen (1 und 2), die die Aufheiz- und die Führungselemente aufweisen. Die zu siegelnden überlappenden Bereiche der Folienbahn (I) laufen durch die Siegelvorrichtung von oben nach unten und werden zunächst von dem ersten Aufheizelement (3) erwärmt, im weiteren Verlauf, werden die überlappenden Bereiche der Foiienbahn dann durch das Führungelement (4) geführt, geglättet und zusammengepreßt, bevor sie des weiteren von dem 2. Aufheizelement (5) weiter erwärmt werden. Die Siegelnahtbereiche der Folienbahn passieren dann das Führungselement (6), das Aufheizelement (7), das Führungseiement (8), das Aufheizelement (9), das Führungselement (10) und das Aufheizelement (11), um so bis zur Siegeltemperatur erwärmt und vollständig gesiegelt die erfindungsgemäße Vorrichtung zu verlassen.Figure 1 shows the device according to the invention in plan view. The device consists of two identical parts (1 and 2), which have the heating and the guide elements. The overlapping areas of the film web (I) to be sealed run through the sealing device from top to bottom and are first heated by the first heating element (3), in the further course, the overlapping areas of the film web are then guided by the guide element (4), smoothed and pressed together before they are further heated by the second heating element (5). The sealing seam areas of the film web then pass the guide element (6), the heating element (7), the guide element (8), the heating element (9), the guide element (10) and the heating element (11), so heated up to the sealing temperature and completely sealed the device according to the invention to leave.
Die Führungselemente (4, 6, 8, und 10) sind als Rollenpaare mit einer Höhe, die mindestens der Breite der herzustellenden Längssiegelπaht entspricht, ausgebildet.The guide elements (4, 6, 8, and 10) are designed as pairs of rollers with a height that corresponds at least to the width of the longitudinal sealing seam to be produced.
Die Aufheizelemente (3,5,7,9 und 11) umfassen 2 Reihen von Heißluftdüsen, die vertikal zur Laufrichtung der Folie angeordnet sind, wobei eine Reihe drei bis sieben Heißluftdüsen aufweist. Die Heißluftdüsen werden aus den Kanälen (12 und 13) mit heißer Luft gespeist, die ihrerseits mit den Kanälen (14 und 15 ) verbunden sind, in denen sich jeweils eine Heizspirale (16, 17) zur Aufheizung der Luft befinden, wie in Fig. 2 dargestellt.The heating elements (3, 5, 7, 9 and 11) comprise 2 rows of hot air nozzles which are arranged vertically to the running direction of the film, one row having three to seven hot air nozzles. The hot air nozzles are fed with hot air from the channels (12 and 13), which in turn are connected to the channels (14 and 15), in each of which there is a heating coil (16, 17) for heating the air, as in FIG. 2 shown.
Die Fig. 2 zeigt die erfindungsgemäße Vorrichtung im Querschnitt in der Ebene A B. Die beiden baugleichen Teile (1 und 2) der erfindungsgemäßen Vorrichtung weisen die zu den Heißluftdüsen führenden Kanäle (12 und 13) auf, die ihrerseits mit der in den Kanälen (14 und 15) mit Hilfe einer Heizspirale (16 und 17) aufgeheizten Luft gespeist werden. Fig. 2 shows the device according to the invention in cross section in the plane A B. The two identical parts (1 and 2) of the device according to the invention have the channels (12 and 13) leading to the hot air nozzles, which in turn with the in the channels ( 14 and 15) with the help of a heating coil (16 and 17) heated air.

Claims

Patentansprüche: Claims:
1. Verfahren zum kontinuieriichen Siegeln der Längsnähte von Folienbahnen durch Erwärmen und Zusammenpressen überlappender Folienbahnbereiche, dadurch gekennzeichnet, daß die zu siegelnden Folienbahnbereiche während der Siegelphase mehrfach, vorzugsweise stufenweise, erhitzt und dazwischen mindestens auch einmal geführt werden.1. A method for the continuous sealing of the longitudinal seams of film webs by heating and compressing overlapping film web regions, characterized in that the film web regions to be sealed are heated several times, preferably stepwise, during the sealing phase and are guided at least once in between.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die zu siegelnden Folienbahnen 1-6 mal, bevorzugt 2-4 mal geführt werden.2. The method according to claim 1, characterized in that the film webs to be sealed are performed 1-6 times, preferably 2-4 times.
3. Verfahren nach den Ansprüchen 1-2, dadurch gekennzeichnet, daß das Erwärmen der Foiienbahnen mit heißer Luft erfolgt.3. Process according to claims 1-2, characterized in that the foil webs are heated with hot air.
4. Verfahren nach den Ansprüchen 1-3 zur Herstellung von Längssiegelnähten von Folien-Verpackungen.4. The method according to claims 1-3 for the production of longitudinal seal seams of film packaging.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Verpackungen Folien-Schlauchbeutelverpackungen sind.5. The method according to claim 4, characterized in that the packaging is film-tubular bag packaging.
6. Vorrichtung zum Siegeln von Folienbahnen, dadurch gekennzeichnet, daß die Vorrichtung Aufheizelemente (3, 5, 7, 9,11) und dazwischen mindestens ein Führungseiement (4, 6, 8, 10) zum Führen des Siegelnahtbereichs aufweist.6. Device for sealing film webs, characterized in that the device has heating elements (3, 5, 7, 9, 11) and between them at least one guide element (4, 6, 8, 10) for guiding the sealing seam area.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Aufheizelemente und die Führungseiemente sequentiell angebracht sind.7. The device according to claim 6, characterized in that the heating elements and the guide elements are attached sequentially.
8. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Vorrichtung 1-6, bevorzugt 2-4, Führungseiemente aufweist. 8. Apparatus according to claim 6 or 7, characterized in that the device 1-6, preferably 2-4, has guide elements.
9. Vorrichtung nach den Ansprüchen 6-8, dadurch gekennzeichnet, daß der Abstand zwischen zwei Führungselementen von 30 bis 70 mm, vorzugsweise 30 und 50 mm, in Foüeniaufrichtung beträgt.9. Device according to claims 6-8, characterized in that the distance between two guide elements of 30 to 70 mm, preferably 30 and 50 mm, in the direction of Foüenia.
10. Vorrichtung nach den Ansprüchen 6-9, dadurch gekennzeichnet, daß als Führungseiement ein Rollenpaar verwendet wird.10. Device according to claims 6-9, characterized in that a pair of rollers is used as a guide element.
11. Vorrichtung nach den Ansprüchen 6-10, dadurch gekennzeichnet, daß die Aufheizelemente wenigstens eine Heißluftdüse ausweisen .11. Device according to claims 6-10, characterized in that the heating elements have at least one hot air nozzle.
12. Vorrichtung nach den Ansprüchen 6-11 , dadurch gekennzeichnet, daß die Heißluftdüsen kreisförmig sind und einen Durchmesser von 1 bis 2 mm aufweisen.12. Device according to claims 6-11, characterized in that the hot air nozzles are circular and have a diameter of 1 to 2 mm.
13. Vorrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Heizvorrichtung zur Erzeugung der Heißluft eine möglichst geringe ther odynamische Trägheit aufweist.13. The apparatus of claim 11 or 12, characterized in that the heating device for generating the hot air has the lowest possible therodynamic inertia.
14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, daß die Heizvorrichtung eine Heizspirale (16,17) ist.14. The apparatus according to claim 13, characterized in that the heating device is a heating coil (16, 17).
15. Verpackungsmaschine aufweisend eine Vorrichtung gemäß den Ansprüchen 6- 14.15. Packaging machine having a device according to claims 6-14.
16. Verpackungsmaschine nach Anspruch 15, dadurch gekennzeichnet, daß es eine horizontale automatische Form-Füll-Siegel-Maschine ist. 16. Packaging machine according to claim 15, characterized in that it is a horizontal automatic form-fill-seal machine.
PCT/EP1998/000125 1997-01-24 1998-01-12 Method and device for sealing foil strips WO1998032588A1 (en)

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DE19702473A DE19702473A1 (en) 1997-01-24 1997-01-24 Method and device for sealing film webs
DE19702473.4 1997-01-24

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