DE19508155A1 - Welding film material into foodstuff packaging - Google Patents

Welding film material into foodstuff packaging

Info

Publication number
DE19508155A1
DE19508155A1 DE19508155A DE19508155A DE19508155A1 DE 19508155 A1 DE19508155 A1 DE 19508155A1 DE 19508155 A DE19508155 A DE 19508155A DE 19508155 A DE19508155 A DE 19508155A DE 19508155 A1 DE19508155 A1 DE 19508155A1
Authority
DE
Germany
Prior art keywords
edges
hot air
guides
cold air
directed
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.)
Withdrawn
Application number
DE19508155A
Other languages
German (de)
Inventor
Paolo Pavan
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.)
Pavan Mapimpianti SpA
Original Assignee
Pavan Mapimpianti SpA
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 Pavan Mapimpianti SpA filed Critical Pavan Mapimpianti SpA
Publication of DE19508155A1 publication Critical patent/DE19508155A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/4322—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 by joining a single sheet to itself
    • 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
    • B29C66/4329—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 the joint lines being transversal but non-orthogonal with respect to the axis of said tubular articles, i.e. being oblique
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8226—Cam mechanisms; Wedges; Eccentric mechanisms
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • B29C66/83241—Joining or pressing tools pivoting around one axis cooperating pivoting tools
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/36—Bending and joining, e.g. for making hollow articles
    • B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
    • B29C53/48—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges for articles of indefinite length, i.e. bending a strip progressively
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8227—Transmission mechanisms using springs
    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Abstract

To weld film material into pouches, especially for foodstuff packaging, a length of film is drawn off a roll and wound round a core in a spiral with the longitudinal edges partially overlapping. A stream of hot air is directed at the overlapping edges at a temp. to soften the material, melt it and fuse the edges together. A stream of cold air is directed at the fused edges to harden the film material. Also claimed is an appts. with a guide (5) to lay the overlapping edges of the film. At least one hot air heater (12) delivers the hot air to fuse the edges, and a cold air feed (13) hardens the fused edges.

Description

Die Erfindung betrifft ein Verfahren zum Verschweißen von Folien aus Kunststoff für die Herstellung von Lebensmittelverpackungen sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for welding foils made of plastic for the production of food packaging and an apparatus for performing the method.

Es sind Verfahren bekannt, mit deren Hilfe Folien aus Kunststoff verschweißt werden, um kissenförmige Verpackungen für Lebensmittel herzustellen. Bei einem dieser Verfahren wird ein Folienband von einer Spule abgezogen und über geeignete Führungen so um ein Rohr gelegt, daß die Längsränder mit ihren Enden teilweise aufeinanderliegen. Dem Rohr liegt eine Stange oder eine Platte gegenüber, die elektrisch erwärmt wird und die sich alternierend in Richtung auf die aufeinanderliegenden Ränder und von diesen weg bewegt, so daß in einer ersten Phase eine teilweise Erweichung der Ränder stattfindet, was anschließend die innige Verbindung der Ränder bis zu ihrer Verschweißung zur Folge hat.Methods are known with the aid of plastic films to be welded to pillow-shaped packaging for To produce food. One of these methods uses a Film tape pulled off a spool and over suitable Guides placed around a tube so that the longitudinal edges with their The ends are partially on top of each other. A rod is lying on the pipe or a plate opposite, which is heated electrically and which alternating towards each other Edges and moved away from them, so in a first phase a partial softening of the edges takes place what then the intimate connection of the edges to theirs Welding results.

Dieses bekannte Verfahren hat jedoch einige Nachteile, insbesondere:However, this known method has some disadvantages especially:

  • - eine geringe Arbeitsgeschwindigkeit aufgrund des diskontinuierlichen Verfahrens, bei dem der Vorschub des Bandes angehalten wird, um die Verschweißung durchzuführen, worauf das Band erneut in Bewegung gesetzt wird;- a slow working speed due to the discontinuous process in which the feed of the tape  is stopped to carry out the welding, whereupon the Band is set in motion again;
  • - die Gefahr, daß die Verpackung einreißt, wenn der Vorschub des Bandes nicht synchron mit der Bewegung des Schweißorgans in Richtung auf und von dem Band weg abläuft;- The risk that the packaging will tear if the feed of the Band out of sync with the movement of the welding element Direction on and off the tape;
  • - es ist nicht möglich, mit ein und derselben Vorrichtung heiß­ schmelzende und heißschweißbare Folien zu verarbeiten, die vielmehr in unterschiedlichen Vorrichtungen versiegelt werden müssen.- It is not possible to get hot with the same device to process melting and heat-weldable foils that rather be sealed in different devices have to.

Der Erfindung liegt die Aufgabe zugrunde, die angegebenen Nachteile zu vermeiden und ein Verfahren und eine Vorrichtung zum Verschweißen von Folien anzugeben, bei denen der Arbeitsablauf kontinuierlich und automatisch sowohl für warmschmelzbare als auch für heißsiegelfähige Werkstoffe durchgeführt werden kann.The invention has for its object the specified Avoid disadvantages and a method and an apparatus for welding foils where the Workflow continuously and automatically for both hot meltable as well as heat sealable materials can be carried out.

Gemäß der Erfindung wird diese Aufgabe durch ein Verfahren gelöst, das Gegenstand des Anspruchs 1 ist. Die Vorrichtung zur Lösung der genannten Aufgabe ergibt sich aus dem Patentanspruch 3. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.According to the invention, this object is achieved by a method solved, the subject of claim 1. The device for The stated object is achieved from the patent claim 3. Advantageous further developments are in the subclaims specified.

Die Erfindung ist nachstehend an einem Ausführungsbeispiel erläutert, das in der Zeichnung dargestellt ist. Es zeigenThe invention is based on an embodiment explained, which is shown in the drawing. Show it

Fig. 1 eine schematische Ansicht einer Vorrichtung zur Durchführung des Verfahrens in einer Stellung vor Funktionsbeginn, Fig. 1 is a schematic view of an apparatus for performing the method in a position before the start function,

Fig. 2 einen Querschnitt durch die Führungen im geöffneten Zustand, Fig. 2 shows a cross section through the guides in the open state,

Fig. 3 die geschlossene Stellung der Führungen im Bereich der Kaltluftdüse und Fig. 3 shows the closed position of the guides in the area of the cold air nozzle and

Fig. 4 einen schematischen Schnitt durch ein Heizelement. Fig. 4 shows a schematic section through a heating element.

Aus der Zeichnung ist zu erkennen, daß die Vorrichtung zur Durchführung des Verfahrens gemäß der Erfindung einer herkömmlichen Einrichtung zur Bildung von kissenförmigen Verpackungen zugeordnet ist. Diese hat ein zylindrisches Rohr 1, das im oberen Bereich einen Kragen 2 und seitlich einen Antriebsriemen 3 aufweist, der zum Abziehen einer Folie 22 von einer nicht gezeigten Rolle dient.From the drawing it can be seen that the device for carrying out the method according to the invention is associated with a conventional device for forming pillow-shaped packaging. This has a cylindrical tube 1 , which has a collar 2 in the upper region and a drive belt 3 on the side, which serves to pull off a film 22 from a roll, not shown.

Die Vorrichtung hat eine Stange 4 aus Aluminium, die zwei Führungspaare 5, 5′ trägt, welche vertikal übereinander angeordnet sind und zwischen denen sich eine Schweißeinrichtung 6 befindet. Insbesondere die Führungen 5 und 5′ sind aus einem reibungsarmen Kunststoff hergestellt und auf Bolzen 7 schwenkbar gelagert, so daß sie aus einer Stellung gemäß Fig. 3, in der ihre Oberflächen im wesentlichen parallel zueinander verlaufen, in eine geöffnete Stellung (Fig. 2) geschwenkt werden können. Für den Übergang von der einen in die andere Stellung dient ein Griff 8, über welchen eine Welle 9 gedreht werden kann, die an ihrem oberen Ende einen Nocken 10 aufweist, der auf zwei Arme 11 der Führungen 5 wirkt.The device has a rod 4 made of aluminum, which carries two pairs of guides 5 , 5 ', which are arranged vertically one above the other and between which there is a welding device 6 . In particular, the guides 5 and 5 'are made of a low-friction plastic and are pivotally mounted on bolts 7 , so that they move from a position according to FIG. 3, in which their surfaces run essentially parallel to one another, into an open position ( FIG. 2) can be pivoted. For the transition from one to the other position, a handle 8 is used , via which a shaft 9 can be rotated, which has a cam 10 at its upper end, which acts on two arms 11 of the guides 5 .

Die Schweißeinrichtung 6 besteht aus zwei Warmluftdüsen 12 und 12′ und aus einer Kaltluftdüse 13, die an dem unteren Führungspaar 5′ vorgesehen ist.The welding device 6 consists of two hot air nozzles 12 and 12 'and a cold air nozzle 13 which is provided on the lower pair of guides 5 '.

Jede Warmluftdüse 12, 12′ hat eine Luftleitung 14, die mit einem Widerstand 15 zur Erzeugung von Infrarotstrahlen in Verbindung steht und die am anderen Ende ein gerichtetes Mundstück 16 aus Kupfer hat, das im wesentlichen gabelförmig ausgebildet ist.Each hot air nozzle 12 , 12 'has an air line 14 which is connected to a resistor 15 for generating infrared rays and which has a directed mouthpiece 16 made of copper at the other end, which is substantially fork-shaped.

Die obere Warmluftdüse 12 ist so ausgebildet, daß die Enden des gerichteten Mundstücks 16 in horizontaler Richtung leicht abgeflacht sind, während bei der unteren Warmluftdüse 12′ die Enden des gerichteten Mundstücks in vertikaler Richtung abgeflacht sind. The upper hot air nozzle 12 is designed so that the ends of the directed mouthpiece 16 are slightly flattened in the horizontal direction, while in the lower hot air nozzle 12 'the ends of the directed mouthpiece are flattened in the vertical direction.

Bei dem Verfahren gemäß der Erfindung wird die bandförmige Folie 22 aus Kunststoff von der Rolle abgezogen und so um das Rohr 1 gelegt, daß eine durchgehende, zylindrische Hülle entsteht, deren einander gegenüberliegenden Ränder nach außen abgeknickt sind, so daß sie zwischen den oberen Führungen 5, den unteren Führungen 5′ und den Enden der Warmluftdüsen 12 und 12′ hindurchlaufen. In dieser Phase liegen die Platten der Führungen mit geringem Abstand einander gegenüber, so daß ein Durchlauf der Kanten möglich ist und diese gleichzeitig so geführt und gehalten werden, daß sie aneinander anliegen.In the method according to the invention, the band-shaped film 22 made of plastic is pulled off the roll and placed around the tube 1 in such a way that a continuous, cylindrical shell is formed, the edges of which lie opposite one another and are bent outwards, so that they lie between the upper guides 5 , The lower guides 5 'and the ends of the hot air nozzles 12 and 12 ' pass through. In this phase, the plates of the guides lie opposite each other at a small distance, so that the edges can run through and at the same time they are guided and held so that they abut one another.

Sobald die Antriebsriemen 3 die Folie berühren, wird diese an dem Rohr 1 entlang vorwärtsbewegt und in die beiden Warmluftdüsen 12 und 12′ sowie in die Kaltluftdüse 13 Druckluft geleitet.As soon as the drive belt 3 touch the film, it is moved along the tube 1 and passed into the two hot air nozzles 12 and 12 'and into the cold air nozzle 13 compressed air.

Die durch die Warmluftdüsen 12 und 12′ strömende Luft wird über die Widerstände 15 auf eine Temperatur von etwa 150° bis 200°C aufgeheizt, so daß der Werkstoff der beiden aufeinanderliegenden Ränder erweicht wird und eine Verschmelzung und gegenseitige Druchdringung erzeugt werden. Wenn dieser Teil der Folie anschließend durch die Kaltluftdüse 13 läuft, aus der die Luft mit einer Temperatur von etwa 8° bis 10°C strömt, werden die beiden innig miteinander verbundenen Kanten zum Erstarren gebracht, so daß eine Hülle mit geschlossener Zylinderform gebildet wird.The air flowing through the warm air nozzles 12 and 12 'is heated via the resistors 15 to a temperature of about 150 ° to 200 ° C, so that the material of the two edges lying on top of each other is softened and a fusion and mutual penetration are generated. When this part of the film then runs through the cold air nozzle 13 , from which the air flows at a temperature of about 8 ° to 10 ° C, the two intimately connected edges are solidified, so that a shell with a closed cylindrical shape is formed.

Jedes Mundstück 16 kann in seiner axialen Richtung zu dem zylindrischen Rohr 1 hin und von diesem wegbewegt werden, wozu ein Hydraulikzylinder 17 dient, dessen Kolbenstange 18 eine Buchse 19 trägt, die mit dem Mundstück 16 fest verbunden und auf einem Rohr 20 verschieblich ist, das mit dem Widerstand 15 verbunden ist. Diese Axialbewegung des Mundstücks 16 ist erforderlich, um dieses außer Eingriff mit der Folie zu bringen, wenn diese nicht vorwärtsbewegt wird; auf diese Weise wird verhindert, daß aufgrund einer übermäßigen Erhitzung der Folienwerkstoff wegschmilzt.Each mouthpiece 16 can be moved in its axial direction towards and away from the cylindrical tube 1 , for which purpose a hydraulic cylinder 17 is used, the piston rod 18 of which carries a bushing 19 which is fixedly connected to the mouthpiece 16 and is displaceable on a tube 20 which is connected to the resistor 15 . This axial movement of the mouthpiece 16 is required to disengage the film when it is not being advanced; this prevents the film material from melting away due to excessive heating.

An die in Fig. 1 gezeigte Vorrichtung schließen sich nach unten hin herkömmliche Einrichtungen zur Horizontalverschweißung an, die nicht weiter dargestellt sind und dazu dienen, die Verpackungshülle nach dem Füllen in Querrichtung zu schließen.The device shown in FIG. 1 is followed at the bottom by conventional devices for horizontal welding, which are not shown in more detail and which serve to close the packaging envelope in the transverse direction after filling.

Aus der vorstehenden Beschreibung ergibt sich, daß mit der Erfindung eine Reihe von Vorteilen erzielt wird, insbesondere:From the above description it follows that with the Invention a number of advantages are achieved, in particular:

  • - hohe Arbeitsgeschwindigkeit, da zwischen den Schweißelementen und der zu versiegelnden Folie kein mechanischer Kontakt stattfindet;- high working speed because between the welding elements and the film to be sealed no mechanical contact takes place;
  • - Möglichkeit der Versiegelung aller Folienwerkstoffe, seien es warmschmelzbare oder warmverschweißbare;- Possibility of sealing all foil materials, be it heat-fusible or heat-weldable;
  • - keine Probleme des Absetzens von Restmaterial nach dem Schweißen, weil die Teile gegenseitig nicht in Berührung miteinander sind;- no problems of settling residual material after the Welding because the parts do not touch each other are with each other;
  • - Energieeinsparung aufgrund der Tatsache, daß die Schweißelemente frei von Wärmeträgheit sind.- Energy saving due to the fact that the Welding elements are free from thermal inertia.

Claims (8)

1. Verfahren zum Verschweißen von Folien zur Herstellung kissenförmiger Verpackungen für Lebensmittel, bei dem in einer ersten Phase ein von einer Rolle abgewickeltes Band so um einen Kern herumgelegt wird, daß die Längsränder des Bandes wenigstens teilweise aufeinanderliegen, dadurch gekennzeichnet, daß auf die übereinanderliegenden Längsränder des Bandes ein Heißluftstrahl gerichtet wird, dessen Temperatur eine Erweichung, Verschmelzung und gegenseitige Durchdringung erzeugt, und daß anschließend ein Kaltluftstrahl auf die sich einander durchdringenden Schweißkanten gerichtet wird und diese dadurch zum Erstarren bringt.1. A method for welding foils for the production of pillow-shaped packaging for foodstuffs, in which, in a first phase, a tape unwound from a roll is placed around a core in such a way that the longitudinal edges of the tape lie at least partially on top of one another, characterized in that on the superimposed longitudinal edges a hot air jet is directed to the strip, the temperature of which produces a softening, fusion and mutual penetration, and that a cold air jet is subsequently directed onto the mutually penetrating welding edges, thereby causing them to solidify. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Längsränder des Bandes durch Führungen (5, 5′) so vorwärtsbewegt werden, daß die Ränder aneinander anliegen.2. The method according to claim 1, characterized in that the longitudinal edges of the band are moved forward by guides ( 5 , 5 ') so that the edges abut each other. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Band während der Fusion und der anschließenden Erstarrung kontinuierlich vorwärtsbewegt wird.3. The method according to claim 1 or 2, characterized in that the tape during the merger and subsequent solidification is continuously moved forward. 4. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Führung (5) für den Durchlauf der übereinanderliegenden, zu verschweißenden Kanten der Folie, wenigstens einen Heißluft-Erhitzer (12) zum Erweichen, zur Verschmelzung und zur gegenseitigen Durchdringung der Ränder, und ein Organ (13) zur Zuführung von Kaltluft für die Verfestigung der miteinander verschweißten Kanten.4. Device for performing the method according to one of claims 1 to 3, characterized by a guide ( 5 ) for the passage of the superimposed, to be welded edges of the film, at least one hot air heater ( 12 ) for softening, for fusion and for mutual Penetration of the edges, and a member ( 13 ) for supplying cold air for strengthening the edges welded together. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß zwei Führungspaare (5, 5′) übereinander angeordnet sind, die zwischen sich die Heißluft-Erhitzer (12, 12′) sowie das Kaltluftorgan (13) aufnehmen, wobei jedes Führungspaar zwei Platten aus reibungsarmem Werkstoff besitzt, die relativ zueinander schwenkbar gelagert sind. 5. The device according to claim 4, characterized in that two pairs of guides ( 5 , 5 ') are arranged one above the other, between them the hot air heater ( 12 , 12 ') and the cold air element ( 13 ), with each pair of guides two plates has low-friction material that are pivotally mounted relative to each other. 6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß jeder Heißluft-Erhitzer (12, 12′) ein gerichtetes Mundstück (16) aufweist, das im wesentlichen gabelförmig ausgebildet ist.6. Apparatus according to claim 4 or 5, characterized in that each hot air heater ( 12 , 12 ') has a directed mouthpiece ( 16 ) which is substantially fork-shaped. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß jedes Mundstück (16) mit der Kolbenstange (18) eines Hydraulikzylinders (17) für die Axialverschiebung verbunden ist.7. The device according to claim 6, characterized in that each mouthpiece ( 16 ) with the piston rod ( 18 ) of a hydraulic cylinder ( 17 ) is connected for the axial displacement. 8. Vorrichtung nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß jeder Heißluft-Erhitzer (12, 12′) einen Widerstand (15) für die Erzeugung von Infrarotstrahlen aufweist.8. Device according to one of claims 4 to 7, characterized in that each hot air heater ( 12 , 12 ') has a resistor ( 15 ) for the generation of infrared rays.
DE19508155A 1994-03-10 1995-03-08 Welding film material into foodstuff packaging Withdrawn DE19508155A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT94VE000014A ITVE940014A1 (en) 1994-03-10 1994-03-10 PROCESS OF WELDING OF PLASTIC FILM TO MAKE PACKAGES FOR FOOD PRODUCTS AND EQUIPMENT TO MAKE

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DE19508155A1 true DE19508155A1 (en) 1995-09-14

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804221A1 (en) * 1998-02-04 1999-08-05 Natec Reich Summer Gmbh Co Kg Method and device for producing a continuous film tube from a flat film web
WO2000050306A1 (en) * 1999-02-22 2000-08-31 Glenn Gustafsson Device and method for wrapping soft elements
EP1923202A1 (en) * 2006-11-17 2008-05-21 Teepack Spezialmaschinen Gmbh & Co. Kg Process and apparatus for producing a tubular bag
DE202009012907U1 (en) * 2009-09-25 2011-02-10 Hastamat Verpackungstechnik Gmbh Tubular bag machine for producing and filling tubular bags

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804221A1 (en) * 1998-02-04 1999-08-05 Natec Reich Summer Gmbh Co Kg Method and device for producing a continuous film tube from a flat film web
EP0934816A1 (en) * 1998-02-04 1999-08-11 Natec Reich, Summer GmbH & Co. KG Process and apparatus for manufacturing a continuous tubular sheath from a film web
WO2000050306A1 (en) * 1999-02-22 2000-08-31 Glenn Gustafsson Device and method for wrapping soft elements
US6708465B1 (en) 1999-02-22 2004-03-23 Glenn Gustafsson Device and method for wrapping soft elements
EP1923202A1 (en) * 2006-11-17 2008-05-21 Teepack Spezialmaschinen Gmbh & Co. Kg Process and apparatus for producing a tubular bag
DE202009012907U1 (en) * 2009-09-25 2011-02-10 Hastamat Verpackungstechnik Gmbh Tubular bag machine for producing and filling tubular bags

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Publication number Publication date
ITVE940014A0 (en) 1994-03-10
ITVE940014A1 (en) 1995-09-10

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