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AT382112B - WELDING DEVICE - Google Patents

WELDING DEVICE

Info

Publication number
AT382112B
AT382112B AT0452883A AT452883A AT382112B AT 382112 B AT382112 B AT 382112B AT 0452883 A AT0452883 A AT 0452883A AT 452883 A AT452883 A AT 452883A AT 382112 B AT382112 B AT 382112B
Authority
AT
Austria
Prior art keywords
welding
welding device
anvil wheel
transport
plastic webs
Prior art date
Application number
AT0452883A
Other languages
German (de)
Other versions
ATA452883A (en
Inventor
Karl Wittmann
Original Assignee
Trentini & Cie Kommanditgesell
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 Trentini & Cie Kommanditgesell filed Critical Trentini & Cie Kommanditgesell
Priority to AT0452883A priority Critical patent/AT382112B/en
Publication of ATA452883A publication Critical patent/ATA452883A/en
Application granted granted Critical
Publication of AT382112B publication Critical patent/AT382112B/en

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
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—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 mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/086—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using a rotary anvil
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a roller
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7443—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc by means of ultrasonic vibrations
    • 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
    • B29C66/05—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
    • 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
    • B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • 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
    • B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • 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
    • 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
    • B29C66/70—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

       

   <Desc/Clms Page number 1> 
 



   Die Erfindung bezieht sich auf eine Schweissvorrichtung zur Herstellung einer sich in Durchlaufrichtung erstreckenden Schweissnaht zwischen übereinander liegenden Kunststoffbahnen, mit einer an einer Seite der Vorschubebene der Kunststoffbahnen angeordneten Schweisseinrichtung, der an der andern Seite ein Ambossrad zugeordnet ist, weiters mit Andrückrollen und mit umlaufenden Transportmitteln. 



   Eine derartige Vorrichtung zeigt beispielsweise die AT-PS Nr. 254506, wobei der Transport der zu verbindenden, einander überlappenden Folienbahnen mittels eines endlosen angetriebenen Bandes erfolgt, das entlang der herzustellenden Schweissnaht auf den Folienbahnen aufliegt. Das Transportband wird von einer erwärmbaren Schweissrolle an die Folienbahnen angepresst, wobei die durch das Transportband übertragene Wärme die Verbindung herstellt. An der der Schweissrolle gegenüberliegenden Seite der Folienbahnen ist als Ambossrad eine wärmeisolierte Tragwalze vorgesehen. Zu beiden Seiten der Schweissrolle sind lose drehbare Laufrollen gelagert, durch die die Dicke des verschweissten Überlappungsbereiches gleich der Dicke der Folienbahnen gehalten wird.

   Da im Schweissbereich eine Erweichung des Materials stattfindet, sind auf Grund des Transportes durch die Einrichtung Längsdehnungen nur durch eine entsprechende breite und lange Anlagezone des Transportbandes beherrschbar, das dabei im Anschluss an den Schweissbereich meist zusätzlich wieder gekühlt werden muss. 



   Eine weitere Schweisseinrichtung zeigt die AT-PS Nr. 325298, bei der eine gegebenenfalls antreibbare Rolle und eine um eine senkrecht verlaufende Achse angetriebene, lichtdurchlässige Scheibe zusammenwirken, zwischen denen die Folienbahnen transportiert werden. Die Schweissenergie wird dabei von einer Lichtquelle an der andern Seite der lichtdurchlässigen Scheibe abgegeben. 



  Durch die parallel zu den Folienbahnen sich drehende Scheibe wird der erwärmte Schweissbereich an der Seite der Scheibe   Längs- und   Querdehnungen unterworfen. 



   Nach der AT-PS Nr. 289376 wirkt ein angetriebenes, mit einer Schneide versehenes Schweissrad, das direkt erwärmt wird, mit einem gekühlten Gegendrucklager aus festen Profilschienen zusammen, wobei das Schweissrad einen festen Niederhalter für die Folienbahnen durchdringt. An beiden Seiten wird bei dieser Vorrichtung der erwärmte Schweissbereich Längsdehnungen unterworfen, wobei zusätzlich zum angetriebenen Trennschweissrad ein Transportantrieb für die Folienbahnen erforderlich ist. 



   Die gleichen Probleme treten auf, wenn das Verschweissen mittels eines Ultraschallwerkzeuges erfolgt, dem ein drehbares Ambossrad gegenüberliegt (vgl. DE-OS 1604733). Dabei ist es belanglos, ob das Ultraschallwerkzeug selbst drehbar ist, wie dies die GB-PS   Nr. 1, 167, 549   und Nr. 2, 062, 538 zeigen, da dieses Werkzeug und das damit zusammenwirkende Ambossrad notwendigerweise an den Bahnen angreifen, wo diese am stärksten erweicht sind. 



   Die Erfindung hat es sich nun zur Aufgabe gestellt, eine Vorrichtung der eingangs genannten Art so auszubilden, dass der erwärmte Schweissbereich möglichst geringen Längsdehnungen unterworfen wird, und dabei ein möglichst einfacher Aufbau ohne zusätzlichen Transportantrieb erreicht wird. 



   Erfindungsgemäss wird dies dadurch erreicht, dass als Schweisseinrichtung in an sich bekannter Weise ein mit einem antreibbaren Ambossrad versehenes Ultraschallschweisswerkzeug vorgesehen ist, und dass zu beiden Seiten des Ambossrades unmittelbar anschliessend je eine antreibbare Transportrolle für die Kunststoffbahnen vorgesehen ist, der an der andern Seite der Vorschubebene der Kunststoffbahnen eine vorzugsweise lose drehbare   Andrückrolle   gegenüberliegt, wobei die beiden Transportrollen auf der Antriebswelle befestigt sind und die   Andrückrollen   das Ultraschallschweisswerkzeug flankieren. 



   Dabei ist es an sich bekannt (AT-PS Nr. 345181), auf der Antriebswelle von einem Paar von Schneidrädern, die zur Ausbildung von   Einritzungen,   und Einschnitten in einem Papierstreifen bei der Herstellung von Zigarettenpackungen eingesetzt werden, zusätzliche Transportrollen zwischen den Schneidrädern vorzusehen. Hiebei wird jedoch nur ein sicherer Transport des Papierstreifens bezweckt, der selbstverständlich keinen   Längs- oder   Querdrehungen auf Grund einer Materialerweichung unterworfen wird. 



   Bei der erfindungsgemässen Vorrichtung werden die zu verschweissenden Folienbahnen in den beiden seitlich an den vom Ultraschallschweisswerkzeug erwärmten Schweissbereich unmittelbar 

 <Desc/Clms Page number 2> 

 angrenzenden Abschnitten von den Transportrollen ergriffen. Es findet daher praktisch keine oder nur eine vernachlässigbare Längsdehnungsbeanspruchung der erweichten Folienbahnen statt. Dass die beiden Transportrollen auf der Antriebswelle zu beiden Seiten des Ambossrades befestigt sind, wobei die Andrückrollen das Ultraschallschweisswerkzeug flankieren, vereinfacht den Aufbau der Vorrichtung wesentlich. Die auf ein örtliches Minimum beschränkte Wärmeeinwirkung erübrigt im allgemeinen auch eine zusätzliche Kühleinrichtung. 



   In einer bevorzugten Ausführung der Erfindung ist dabei vorgesehen, dass jede Transportrolle eine Umfangsrille aufweist, in die ein Ring aus elastischem Material angelegt ist, wie dies gemäss GB-PS Nr. 2, 062, 538 für die Ambossrolle vorgesehen ist. Hiebei kann es sich beispielsweise um eine Gummirundschnur od. dgl. handeln, durch die auch ein geringer Schlupf zwischen den Folienbahnen und den Transportrollen vermieden wird. Die wirksame Fläche des Ambossrades weist für die blosse Ausbildung von Schweissnähten eine der Leistung des Ultraschallschweisswerkzeuges angepasste Breite auf. Soll mit der Vorrichtung jedoch gleichzeitig auch eine Längstrennung des verschweissten Streifens vorgenommen werden, so sieht eine weitere Ausführung der Erfindung vor, dass das Ambossrad wie an sich bekannt, umfangsmittig eine Schneide aufweist.

   Es ergeben sich dadurch verschiedene Querschnittsformen des Umfangsringbereiches des Ambossrades, die für die blosse Verschweissung beispielsweise rechteckig oder trapezförmig, für eine gleichzeitige Durchtrennung beispielsweise dreieckig oder aus diesen Grundformen zusammengesetzt sein können. 



   Nachstehend wird nun die Erfindung an Hand der Zeichnungen in einer Ausführung näher beschrieben, ohne darauf beschränkt zu sein. Fig. 1 zeigt eine schematische Ansicht der Vorrichtung in Durchlaufrichtung der Kunststoffbahnen, Fig. 2 eine Seitenansicht der Vorrichtung und Fig. 3 vergrössert einen Abschnitt aus dem unmittelbaren   Schweiss- und   Transportbereich. 



   Die erfindungsgemässe Vorrichtung weist ein stehendes   Ultraschallschweisswerkzeug --7--   
 EMI2.1 
 
3)- vorzugsweise lose drehbar gelagert sind. An der andern Seite der beiden durch eine Längsnaht zu verbindenden Kunststoffbahnen --3-- ist dem Arbeitsteil des Ultraschallschweisswerkzeuges -   gegenüberliegend   ein   Ambossrad --5-- auf   einer Antriebswelle --2-- angeordnet. Die Antriebswelle --2-- wird von einem Antriebsteil-l-in Drehung versetzt. Zu beiden Seiten des   Ambossrades --5-- ist   auf der Antriebswelle --2-- je eine Transportrolle --4-- befestigt, die eine Umfangsrille aufweist. In diese ist ein Ring --6-- aus elastischem Material eingelegt. Die Transportrollen --4-- sind dabei den   Andrückrollen-9-direkt gegenüberliegend   angeordnet.

   Wie insbesondere aus Fig. 3 ersichtlich, erfassen die Transportrollen --4-- und die   Andrückrollen --9--   den unmittelbaren Nachbarbereich des Schweissbereiches der beiden Kunststoffbahnen --3--, in dem keine nennenswerte Erwärmung stattfindet. Der dazwischenliegende Schweissbereich, in dem eine Erweichung der Folienbahnen stattfindet, unterliegt daher höchstens einer unbedeutenden Längsdrehung, wobei eine örtlich nur auf diese Zone beschränkte Erwärmung stattfindet, die eine nachfolgende Kühlung erübrigt. 
 EMI2.2 
 
Kunststoffbahnen-3-fläche aufweisen. Die in den Zeichnungen dargestellte Ausführung der erfindungsgemässen Vorrichtung ist nun zum gleichzeitigen Längsschneiden der verschweissten Kunststoffbahnen --3-- vorgesehen.

   Das   Ambossrad --5-- ist   daher umfangsmittig mit einer Schneide --10-- versehen, die die sich bildende Schweissnaht längsteilt. Das im Teilabschnitt in Fig. 1 gezeigte   Ambossrad --5-- kann   daher im Umfangsringbereich auch eine andere Querschnittsform aufweisen. Beispielsweise könnte sich beidseits der Schneide --10-- ein schmaler achsparalleler Umfangsbereich anschliessen, so 
 EMI2.3 




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   The invention relates to a welding device for producing a welding seam extending in the direction of passage between superimposed plastic webs, with a welding device arranged on one side of the feed plane of the plastic webs and associated with an anvil wheel on the other side, further with pressure rollers and with rotating means of transport.



   Such a device is shown, for example, in AT-PS No. 254506, the transport of the overlapping film webs to be connected being carried out by means of an endless driven belt which lies on the film webs along the weld seam to be produced. The conveyor belt is pressed onto the film webs by a heatable welding roller, the heat transferred by the conveyor belt making the connection. On the side of the film webs opposite the welding roll, a heat-insulated support roller is provided as the anvil wheel. Loosely rotatable rollers are mounted on both sides of the welding roller, by means of which the thickness of the welded overlap area is kept equal to the thickness of the film webs.

   Since the material softens in the welding area, due to the transport by the device, longitudinal expansions can only be controlled by a correspondingly wide and long contact zone of the conveyor belt, which usually has to be cooled again after the welding area.



   Another welding device is shown in AT-PS No. 325298, in which an optionally drivable roller and a translucent disk driven about a vertical axis interact, between which the film webs are transported. The welding energy is emitted by a light source on the other side of the translucent pane.



  Due to the disc rotating parallel to the film webs, the heated welding area on the side of the disc is subjected to longitudinal and transverse expansions.



   According to AT-PS No. 289376, a driven welding wheel with a cutting edge, which is heated directly, interacts with a cooled counter-pressure bearing made of solid profiled rails, the welding wheel penetrating a fixed hold-down device for the film webs. In this device, the heated welding area is subjected to longitudinal expansions on both sides, a transport drive for the film webs being required in addition to the driven separating welding wheel.



   The same problems occur if the welding is carried out by means of an ultrasound tool which is opposite a rotatable anvil wheel (cf. DE-OS 1604733). It is irrelevant whether the ultrasound tool itself can be rotated, as shown in GB-PS No. 1, 167, 549 and No. 2, 062, 538, since this tool and the anvil wheel interacting with it necessarily engage the webs where these are most softened.



   The object of the invention is now to design a device of the type mentioned in the introduction in such a way that the heated welding area is subjected to the least possible longitudinal strains, and the simplest possible construction is achieved without an additional transport drive.



   According to the invention, this is achieved in that an ultrasonic welding tool provided with a drivable anvil wheel is provided as a welding device in a manner known per se, and that a drivable transport roller for the plastic webs is provided on both sides of the anvil wheel, which is on the other side of the feed plane the plastic webs is opposite a preferably loosely rotatable pressure roller, the two transport rollers being fastened to the drive shaft and the pressure rollers flanking the ultrasonic welding tool.



   It is known per se (AT-PS No. 345181) to provide additional transport rollers between the cutting wheels on the drive shaft of a pair of cutting wheels which are used to form incisions and cuts in a paper strip in the manufacture of cigarette packs. However, the purpose of this is only to securely transport the paper strip, which of course is not subjected to longitudinal or transverse rotations due to material softening.



   In the device according to the invention, the film webs to be welded directly in the two to the side of the welding area heated by the ultrasonic welding tool

 <Desc / Clms Page number 2>

 adjacent sections seized by the transport rollers. There is therefore practically no or only negligible longitudinal strain on the softened film webs. The fact that the two transport rollers are fastened to the drive shaft on both sides of the anvil wheel, the pressure rollers flanking the ultrasonic welding tool, simplifies the construction of the device considerably. The heat effect, which is limited to a local minimum, generally also makes an additional cooling device unnecessary.



   In a preferred embodiment of the invention, it is provided that each transport roller has a circumferential groove into which a ring made of elastic material is placed, as is provided for the anvil roller according to GB-PS No. 2, 062, 538. This can be, for example, a round rubber cord or the like, by means of which a small amount of slippage between the film webs and the transport rollers is avoided. The effective surface of the anvil wheel has a width adapted to the performance of the ultrasonic welding tool for the mere formation of weld seams. However, if the device is also to be used for longitudinal separation of the welded strip at the same time, a further embodiment of the invention provides that the anvil wheel, as is known per se, has a cutting edge in the center.

   This results in different cross-sectional shapes of the circumferential ring area of the anvil wheel, which can be rectangular or trapezoidal for mere welding, triangular for simultaneous cutting or composed of these basic shapes.



   The invention will now be described in more detail in one embodiment with reference to the drawings, without being limited thereto. 1 shows a schematic view of the device in the direction of passage of the plastic webs, FIG. 2 shows a side view of the device and FIG. 3 enlarges a section from the immediate welding and transport area.



   The device according to the invention has a standing ultrasonic welding tool --7--
 EMI2.1
 
3) - preferably loosely rotatably mounted. On the other side of the two plastic webs --3-- to be connected by a longitudinal seam, an anvil wheel --5-- is arranged on a drive shaft --2-- opposite the working part of the ultrasonic welding tool. The drive shaft --2-- is rotated by a drive part-l-. On both sides of the anvil wheel --5--, a transport roller --4-- is attached to the drive shaft --2--, which has a circumferential groove. A ring --6-- made of elastic material is inserted into this. The transport rollers --4-- are arranged directly opposite the pressure rollers 9.

   As can be seen in particular from FIG. 3, the transport rollers --4-- and the pressure rollers --9-- record the immediate neighboring area of the welding area of the two plastic sheets --3--, in which no significant heating takes place. The welding area in between, in which the film webs soften, is therefore subject to at most an insignificant longitudinal rotation, with localized heating only limited to this zone, which makes subsequent cooling unnecessary.
 EMI2.2
 
Have 3-surface plastic sheets. The embodiment of the device according to the invention shown in the drawings is now intended for simultaneous longitudinal cutting of the welded plastic sheets -3--.

   The anvil wheel --5-- is therefore provided with a cutting edge --10-- around the circumference, which cuts the weld seam that forms. The anvil wheel --5-- shown in the partial section in FIG. 1 can therefore also have a different cross-sectional shape in the circumferential ring region. For example, a narrow, axially parallel circumferential area could follow on both sides of the cutting edge --10--
 EMI2.3

Claims (1)

--10-- undPATENTANSPRÜCHE : 1. Schweissvorrichtung zur Herstellung einer sich in Durchlaufrichtung erstreckenden Schweissnaht zwischen übereinander liegenden Kunststoffbahnen, mit einer an einer Seite der Vorschubebene der Kunststoffbahnen angeordneten Schweisseinrichtung, der an der andern Seite ein Ambossrad zugeordnet ist, weiters mit Andrückrollen und mit umlaufenden Transportmitteln, dadurch gekennzeichnet, dass als Schweisseinrichtung in an sich bekannter Weise ein mit einem antreibbaren Ambossrad (5) versehenes Ultraschallschweisswerkzeug (7) vorgesehen ist, und dass zu beiden Seiten des Ambossrades unmittelbar anschliessend je eine antreibbare Transportrolle (4) für die Kunststoffbahnen vorgesehen ist, der an der andern Seite der Vorschubebene der Kunststoffbahnen eine vorzugsweise lose drehbare Andrückrolle (9) gegenüberliegt,   --10-- and PATENT CLAIMS: 1.Welding device for producing a welding seam extending in the direction of passage between superimposed plastic webs, with a welding device arranged on one side of the feed plane of the plastic webs, to which an anvil wheel is assigned on the other side, further with pressure rollers and with circumferential transport means, characterized in that An ultrasonic welding tool (7) provided with a drivable anvil wheel (5) is provided as a welding device in a manner known per se, and a drivable transport roller (4) for the plastic webs is provided on both sides of the anvil wheel, which is on the other side the feed plane of the plastic webs is opposite a preferably loosely rotatable pressure roller (9), wobei die beiden Transportrollen (4) auf der Antriebswelle (2) befestigt sind und die Andrückrollen (9) das Ultraschallschweisswerkzeug (7) flankieren.  the two transport rollers (4) being fastened to the drive shaft (2) and the pressure rollers (9) flanking the ultrasonic welding tool (7). 2. Schweissvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jede Transportrolle (4) eine Umfangsrille aufweist, in die in an sich bekannter Weise ein Ring (6) aus elastischem Material eingelegt ist.  2. Welding device according to claim 1, characterized in that each transport roller (4) has a circumferential groove into which a ring (6) made of elastic material is inserted in a manner known per se. 3. Schweissvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Ambossrad (5), wie an sich bekannt, umfangsmittig eine Schneide (10) aufweist.  3. Welding device according to claim 1, characterized in that the anvil wheel (5), as known per se, has a cutting edge (10) around the center.
AT0452883A 1983-12-27 1983-12-27 WELDING DEVICE AT382112B (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356889A2 (en) * 1988-08-30 1990-03-07 4P Nicolaus Kempten GmbH Process and apparatus for welding plastics surfaces together
WO1994014583A1 (en) * 1992-12-24 1994-07-07 Molins Plc Web cutting apparatus
FR2784051A1 (en) * 1998-10-06 2000-04-07 Unisabi Sa ULTRASONIC WELDING DEVICE
EP1028055A2 (en) * 1999-02-08 2000-08-16 SIG Pack Systems AG Device for longitudinal sealing and cutting of a thermoplastic packaging tube, especially for tubular bag packaging machines
WO2001074568A1 (en) * 2000-04-05 2001-10-11 Masterfoods Ultrasonic sealing device, related method and package
FR2807392A1 (en) * 2000-04-05 2001-10-12 Unisabi Sa Ultrasonic welding device for making food packaging, etc., by welding flexible plastic sheets has passage between ultrasonic source and anvil with projecting ridge parallel to sheet movement
US6574944B2 (en) 2001-06-19 2003-06-10 Mars Incorporated Method and system for ultrasonic sealing of food product packaging
US6635292B2 (en) 2001-10-26 2003-10-21 Mars, Incorporated Ultrasonic rotary forming of food products
US6655948B2 (en) 2001-08-31 2003-12-02 Mars, Incorporated System of ultrasonic processing of pre-baked food product
WO2006029835A1 (en) * 2004-09-14 2006-03-23 Jentschmann Ag Zürich A welding device
WO2009122251A1 (en) * 2008-04-01 2009-10-08 Jaked S.R.L. Apparatus and method for welding membranes
DE102014108461A1 (en) * 2014-06-16 2015-12-17 Leonhard Kurz Stiftung & Co. Kg Method and device for joining film webs
ITUB20159674A1 (en) * 2015-12-14 2017-06-14 Colombo New Scal Spa MACHINE FOR WELDING FILMS IN PLASTIC MATERIAL

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117183349A (en) * 2023-09-08 2023-12-08 卫圣康医学科技(江苏)有限公司 Double-layer film wire drawing oblique welding equipment and operation method thereof

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AT254506B (en) * 1962-09-15 1967-05-26 Heimbach Gmbh Thomas Josef Welding device for the continuous welding of plastic films
GB1167549A (en) * 1966-12-09 1969-10-15 Radyne Ltd Improvements relating to Ultrasonic Welding
DE1604733A1 (en) * 1965-08-03 1971-01-14 Shell Int Research Method and device for ultrasonic welding of thermoplastic films
AT289376B (en) * 1963-03-05 1971-04-26 Hans Beck Device for separating welding of plastic films
AT325298B (en) * 1970-08-19 1975-10-10 Dl Zentralinstitut Fuer Schwei DEVICE FOR CONTINUOUS WELDING OF FILMS MADE OF THERMOPLASTIC PLASTIC
AT345181B (en) * 1975-03-07 1978-09-11 Gd Spa DEVICE FOR MANUFACTURING THE INTERIOR ELEMENTS FOR A CIGARETTE PACKAGE
GB2062538A (en) * 1979-10-27 1981-05-28 Brother Ind Ltd Ultrasonic seam welding apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT254506B (en) * 1962-09-15 1967-05-26 Heimbach Gmbh Thomas Josef Welding device for the continuous welding of plastic films
AT289376B (en) * 1963-03-05 1971-04-26 Hans Beck Device for separating welding of plastic films
DE1604733A1 (en) * 1965-08-03 1971-01-14 Shell Int Research Method and device for ultrasonic welding of thermoplastic films
GB1167549A (en) * 1966-12-09 1969-10-15 Radyne Ltd Improvements relating to Ultrasonic Welding
AT325298B (en) * 1970-08-19 1975-10-10 Dl Zentralinstitut Fuer Schwei DEVICE FOR CONTINUOUS WELDING OF FILMS MADE OF THERMOPLASTIC PLASTIC
AT345181B (en) * 1975-03-07 1978-09-11 Gd Spa DEVICE FOR MANUFACTURING THE INTERIOR ELEMENTS FOR A CIGARETTE PACKAGE
GB2062538A (en) * 1979-10-27 1981-05-28 Brother Ind Ltd Ultrasonic seam welding apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0356889A2 (en) * 1988-08-30 1990-03-07 4P Nicolaus Kempten GmbH Process and apparatus for welding plastics surfaces together
EP0356889A3 (en) * 1988-08-30 1991-07-03 4P Nicolaus Kempten GmbH Process and apparatus for welding plastics surfaces together
WO1994014583A1 (en) * 1992-12-24 1994-07-07 Molins Plc Web cutting apparatus
FR2784051A1 (en) * 1998-10-06 2000-04-07 Unisabi Sa ULTRASONIC WELDING DEVICE
WO2000020191A1 (en) * 1998-10-06 2000-04-13 Masterfoods Ultrasonic welding apparatus
EP1028055A3 (en) * 1999-02-08 2003-04-02 SIG Pack Systems AG Device for longitudinal sealing and cutting of a thermoplastic packaging tube, especially for tubular bag packaging machines
EP1028055A2 (en) * 1999-02-08 2000-08-16 SIG Pack Systems AG Device for longitudinal sealing and cutting of a thermoplastic packaging tube, especially for tubular bag packaging machines
US6824632B2 (en) 2000-04-05 2004-11-30 Mars Incorporated Ultrasonic sealing device, related method and package
FR2807392A1 (en) * 2000-04-05 2001-10-12 Unisabi Sa Ultrasonic welding device for making food packaging, etc., by welding flexible plastic sheets has passage between ultrasonic source and anvil with projecting ridge parallel to sheet movement
WO2001074568A1 (en) * 2000-04-05 2001-10-11 Masterfoods Ultrasonic sealing device, related method and package
US6574944B2 (en) 2001-06-19 2003-06-10 Mars Incorporated Method and system for ultrasonic sealing of food product packaging
US8028503B2 (en) 2001-06-19 2011-10-04 Robert Bosch Gmbh Method and system for ultrasonic sealing of food product packaging
US6655948B2 (en) 2001-08-31 2003-12-02 Mars, Incorporated System of ultrasonic processing of pre-baked food product
US6635292B2 (en) 2001-10-26 2003-10-21 Mars, Incorporated Ultrasonic rotary forming of food products
WO2006029835A1 (en) * 2004-09-14 2006-03-23 Jentschmann Ag Zürich A welding device
WO2009122251A1 (en) * 2008-04-01 2009-10-08 Jaked S.R.L. Apparatus and method for welding membranes
CN102083614A (en) * 2008-04-01 2011-06-01 吉可德有限责任公司 Apparatus and method for welding membranes
DE102014108461A1 (en) * 2014-06-16 2015-12-17 Leonhard Kurz Stiftung & Co. Kg Method and device for joining film webs
ITUB20159674A1 (en) * 2015-12-14 2017-06-14 Colombo New Scal Spa MACHINE FOR WELDING FILMS IN PLASTIC MATERIAL

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