DE2535139A1 - Schweissbackenanordnung zum verschweissen von kunststoffolien - Google Patents

Schweissbackenanordnung zum verschweissen von kunststoffolien

Info

Publication number
DE2535139A1
DE2535139A1 DE19752535139 DE2535139A DE2535139A1 DE 2535139 A1 DE2535139 A1 DE 2535139A1 DE 19752535139 DE19752535139 DE 19752535139 DE 2535139 A DE2535139 A DE 2535139A DE 2535139 A1 DE2535139 A1 DE 2535139A1
Authority
DE
Germany
Prior art keywords
welding
jaw
cover plate
insulating film
insulated
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Withdrawn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
DE19752535139
Other languages
English (en)
Inventor
Gerhard Lottermoser
Klement Maier
Lothar Mueller
Peter Wagner
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.)
Baerlocher GmbH
Original Assignee
Chemische Werke Muenchen Otto Barlocher GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chemische Werke Muenchen Otto Barlocher GmbH filed Critical Chemische Werke Muenchen Otto Barlocher GmbH
Priority to DE19752535139 priority Critical patent/DE2535139A1/de
Publication of DE2535139A1 publication Critical patent/DE2535139A1/de
Withdrawn legal-status Critical Current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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
    • 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
    • B29C65/745—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 a single unit having both a severing tool and a welding tool
    • B29C65/7451—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 a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/431—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
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/81—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
    • B29C66/81433—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 being toothed, i.e. comprising several teeth or pins, or being patterned
    • B29C66/81435—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 being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
    • 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
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • 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
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along 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
    • B29C66/80—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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/876—Maintenance or cleaning
    • 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
    • B29C66/80—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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Description

  • Schweissbackenanordnung zum Verschweissen von Xunststoffolien Die vorliegende Erfindung betrifft eine Schweissbackenanordnung zum Verschweissen von Eunststoffolien, mit gegenüber dem Backenkörper durch eine Eunststofflage isoliert angeordneten Schweisslitzen, die ihrerseits durch eine Isolierfolie abgedeckt sind.
  • Derartige Schweissbacken dienen zum Verschweissen von endlosen Kunststoffschläuchen zu Beuteln (Doppel-Schweissbacken) oder zum einfachen Zuschweissen von vorher gefertigten Beuteln (Einfach-Schweissbacken).
  • Doppel-Schweissbacken- werden beispielsweise bei vollautomatisch arbeitenden Beutelabfüllmaschinen eingesetzt.
  • Diese Beutel-Abfüllmaschinen sind mit Einrichtungen bestückt, mittels derer auf Rollen aufgezogene Kunststoffolie (200 bis 1000 m lang) automatisch so um den Füllstutzen der Maschine geformt und eine Längsnaht geschweisst wird, dass ein endloser Schlauch entsteht. Dieser so gebildete Schlauch wird zwischen die auseinandergefahrenen erfindungsgemässen Schweissbacken geleitet und nach dem Zusammenfahren der Schweissbacken durch eine untere Quernaht zu einem Beutelgefertigt. Die Schweissbacken fahren auseinander, und die Abfüllmaschine füllt ein vorher eingestelltes Volumen oder Gewicht in den entstandenen Beutel. Während dieses Füllvorganges senkt sich der Beutel auf eine Auflage, die in der Höhe so eingestellt ist, dass sich die Schweissbacken Jetzt etwa-ts~über dem Niveau des Füllgutes im Beutel befinden. Die in diesem Fall verwendeten Doppel-Schweissbacken fahren wieder zusammen und legen zwei einfache oder zwei doppelte Querschweissnähte.
  • Vor dem Auseinanderfahren der Schweissbacken trennt ein Messer den Kunststoffolienschlauch zwischen der Doppelschweissnaht durch.
  • Die untere Schweissnaht wird der obere Verschluss des gefUllten Beutels und die obere Schweissnaht stellt die Bodennaht des nächsten zu fUllenden Beutels dar.
  • Dieser Vorgang wiederholt sich - je nach Beutelleistung der Maschine - bis zu 400 mal oder öfter in der Stunde.
  • Infolge der hohen Beanspruchung der Schweissbacken war es bisher erforderlich, diese in sehr kurzen Abständen von etwa 1 bis maximal 3 Tagen auszuwechseln, weil die Schweisslitzen durch einen an ihnen auftretenden Kurzschluss versagten. Dies führte zum Ausfall der Maschine, wobei der Ausbau der defekten Schweissbacken, der Einbau neuer Ersatz-Schweissbacken, der Anschluss des Kühlwassers, der elektrische Anschluss und das Ausrichten 1 bis 2 Stunden erforderten, während ein Instandsetzen defekter Schweissbacken ebenfalls ca. 2 Stunden benötigte.
  • Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Schweissbacke mit vereinfachtem Aufbau und verlängerter Lebensdauer zu schaffen.
  • Dies wird erfindungsgemäss dadurch erreicht, dass die Schweisslitzen auf einer isolierenden Deckplatte mit mindestens 3 mm Wandstärke aufliegen und die Isolierfolie auf der Deckplatte haftend gehalten wird.
  • Als Folge der erfindungsgemässen Ausbildung wird eine bessere thermische Isolierung der Schweisslitzen erreicht, so dass die Schweissbacke mit einer geringeren Zufuhr elektrischer Leistung auskommt und dadurch der Verschleiss erheblich geringer ist.
  • Gleichzeitig wird durch diese verringerte Zufuhr auch eine bisher erforderliche Wasserkühlung nicht mehr notwendig, so dass ein erheblich einfacherer Backenaufbau erhalten wird, weil Wasserkanäle und Verschraubungen für Wasseranschlüsse an der Schweissbacke entfallen. Durch die erfindungsgemässe Verbesserung wird eine Lebensdauer der Schweissbacke von mehreren Monaten erzielt, während bei einem Durchbrennen der Schweisslitze dieser Schaden in ca. 5 bis 10 Minuten behoben werden kann, ohne dass die Schweissbacken mit ihren Wasseranschlüssen ausgebaut werden müssen.
  • Die Erfindung wird anschliessend anhand der Zeichnungen erläutert.
  • Es zeigen: Fig. 1 bis 3 eine Darstellung einer bekannten Schweissbacke äeweils in Seitenansicht, in Stirnansicht und in Teildraufsicht, Fig. 4 eine Einzelansicht der bekannten Schweisslitze, und Fig. 5 bis 8 entsprechende Ansichten einer erfindungsgemässen Schweissbacke.
  • In Fig. 1 ist eine Seitenansicht einer bekannten Schweissbacke dargestellt, aus welcher die Wasseranschlüsse ersichtlich sind, die bei dieser bekannten Anordnung erforderlich sind, um Kühlwasser dem in Fig. 4 unten gezeigten Kühlwasserkanal zuzuführen.
  • Wie aus Fig. 4 ersichtlich ist, werden zur Befestigung der Schweisslitze am Backenkörper isolierte Drähte verwendet, die in Nuten des Backeiikörpers eingeklemmt werden, um dabei die oberhalb und unterhalb der Schweisslitze angeordnete Isolierfolie festzuklemmen. Es ist unschwer ersichtlich, dass diese komplizierten Xlemmvorgange nur bei demontierter Schweissbacke durchgeführt werden können. Dabei muss die Isolierfolie in die Nuten eingelegt werden, anschliessend wird die Schweisslitze eingelegt und nochmals eine Isolierfolie darübergelegt. Dann wird zu beiden Seiten der Schweisslitzen ein isolierter Draht eingestemmt, welcher die Abdeckisolierfolie festhält und für seitliche Isolierung sorgt.
  • Bei der erfindungsgemässen Ausführung sind gemäss Fig. 8 keine Nuten erforderlich, an welchen irgendwelche Klemmelemente eingelegt werden, vielmehr erfolgt die Befestigung der Schweisslitzen 2 auf einer Abdeckplatte 4, die am Backenkörper befestigt ist, vorzugsweise mittels einer Schwalbenschwanzverbindung 5. Die über der Schweisslitze 2 angeordnete Isolierfolie 3 ist auf der Deckplatte 4 haftend befestigt, insbesondere durch Verkleben.
  • Im Gegensatz zur bekannten Nutenausbildung ist bei der erfindungsgemässen Anordnung eine Deckplatte 4 vorhanden, die infolge ihrer erheblichen Dicke von mindestens 3 mm eine wirksame thermische Isolation zwischen Schweisslitze und Backenkörper ermöglicht, so dass die notwendige elektrische Leistung verhältnismässig gering ist und damit eine lange Lebensdauer der Schweisslitze ermöglicht wird. Infolge der besseren thermischen Isolierung der Anordnung sind keine Kühlwasserkanäle und Anschlüsse erforderlich, so dass die Anordnung mechanisch sehr einfach ist und kostengünstig gefertigt werden kann.
  • Als Deckplatte 4 eignet sich beispielsweise eine Platte aus PTFE. Bei dieser Ausfuehrung ergeben die seitlich eingespannten, nur aufgelegten, Uberstehenden, mit Isolierfolie Uberdeckten Schweisslitzen an den Aussenkanten der Litzen eine sehr scharfe, saubere und dichte Schweissnaht.

Claims (4)

  1. Ansprüche
    Schweissbackenanordnung zum Verschweissen von Kunststofffolien mit gegenüber dem Backenkörper durch eine Kunststofflage isoliert angeordneten Schweisslitzen, die ihrerseits durch eine Isolierfolie abgedeckt sind, dadurch gekennrc(h zeichnet, dass die Schweisslintan t2) auf einer isolierenden Deckplatte (4) mit mindestens 3 mm Wandstärke aufliegen und die Isolierfolie (3) auf der Deckplatte haftend gehalten wird.
  2. 2. Schweissbacken nach Anspruch 1, dadurch gekennzeichnet, dass die Deckplatte (4) mittels einer sich über die Länge der Schweissbacken erstreckenden Schwalbenschwanzverbindung (5) mit der Schweissbacke verbunden ist.
  3. 3. Schweissbacken nach Anspruch 1, dadurch gekennzeichnet, dass die Wandstärke der Deckplatte zwischen 3 bis 4 mm liegt.
  4. 4. Schweissbacken nach Anspruch 1, dadurch gekennzeichnet, dass die Isolierfolie (3) auf der Deckplatte verklebt ist.
DE19752535139 1975-08-06 1975-08-06 Schweissbackenanordnung zum verschweissen von kunststoffolien Withdrawn DE2535139A1 (de)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4936943A (en) * 1988-06-16 1990-06-26 Continental Can Company, Inc. Quick detach assembly for a sealing head
US5149943A (en) * 1992-01-08 1992-09-22 Viskase Corporation Heat sealing member for making contoured heat seals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4936943A (en) * 1988-06-16 1990-06-26 Continental Can Company, Inc. Quick detach assembly for a sealing head
US5149943A (en) * 1992-01-08 1992-09-22 Viskase Corporation Heat sealing member for making contoured heat seals
EP0552407A2 (de) * 1992-01-08 1993-07-28 Viskase Corporation Heissschweissbacke zum Herstellen von Konturschweissnahten
EP0552407A3 (en) * 1992-01-08 1993-09-15 Viskase Corporation Heat sealing member for making contoured heat seals

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