DE3629497C2 - - Google Patents
Info
- Publication number
- DE3629497C2 DE3629497C2 DE19863629497 DE3629497A DE3629497C2 DE 3629497 C2 DE3629497 C2 DE 3629497C2 DE 19863629497 DE19863629497 DE 19863629497 DE 3629497 A DE3629497 A DE 3629497A DE 3629497 C2 DE3629497 C2 DE 3629497C2
- Authority
- DE
- Germany
- Prior art keywords
- welding element
- welding
- film
- feed
- another
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- 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
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- 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
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- 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
- B29C65/229—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for tensioning said heated wire, resistive ribbon, resistive band or resistive strip
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- 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
- B29C65/7861—In-line machines, i.e. feeding, joining and discharging are in one production line
- B29C65/787—In-line machines, i.e. feeding, joining and discharging are in one production line using conveyor belts or conveyor chains
- B29C65/7873—In-line machines, i.e. feeding, joining and discharging are in one production line using conveyor belts or conveyor chains using cooperating conveyor belts or cooperating conveyor chains
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- 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
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- 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
- B29C66/343—Making tension-free or wrinkle-free joints
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
- B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
- B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts
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- 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
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- 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
- B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
- B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
- B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
- B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
- B29C66/91213—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws and measuring the electrical resistance of a resistive element belonging to said welding jaws, said element being, e.g. a thermistor
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- 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
- B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
- B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
- B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
- B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
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- 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
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- 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
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- 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
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- 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
- B29C66/8223—Worm or spindle mechanisms
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- 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
- B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
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- 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
- B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
- B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
Description
Die Erfindung betrifft eine Vorrichtung zur Herstellung einer zwei aufeinanderliegende Folienbahnen miteinander verbindenden Längsschweißnaht mit den Merkmalen im Ober begriff des Patentanspruches 1.The invention relates to a device for production one of two superimposed film webs with each other connecting longitudinal weld with the features in the upper Concept of claim 1.
Bei Verpackungsmaschinen, bei denen Gegenstände in Folien eingeschweißt werden, werden die Folienverpackungen häufig aus zwei aufeinanderliegenden Folienbahnen hergestellt, die mittels einer Längsschweißnaht miteinander verbunden werden. Die Längsschweißnaht verläuft dabei parallel zur Vorschubrichtung der längs einer Vorschubbahn vorgeschobe nen, von den Folienbahnen umhüllten, zu verpackenden Gegen stände.In packaging machines where objects are in foils are sealed, the film packaging is common made from two foil sheets lying on top of each other, which are connected to each other by means of a longitudinal weld will. The longitudinal weld seam runs parallel to The direction of advance is advanced along a feed path Nene, to be packaged, covered by the film webs stands.
Die Breite der hergestellten Längsschweißnaht hängt bei bekannten Vorrichtungen, bei denen das Schweißelement pa rallel zur Vorschubrichtung angeordnet ist, von der Breite der beheizten Heizelementfläche ab. Es ist dabei nicht möglich, eine bestimmte, relativ geringe Breite zu über schreiten, da bei sehr breit ausgebildeten Heizleitern un gleichmäßige Aufheizung der zwischen dem Heizleiter und der Gegendruckfläche eingespannten Folienbahnen erfolgt; bei Verwendung breiter Heizelemente werden die am Heizleiter anliegenden Folienflächen in den Randbereichen wegen der größeren Wärmeabstrahlung weniger aufgeheizt als im Mittel bereich, so daß auf diese Weise breite, homogene Schweißnähte nicht herstellbar sind. (DE-PS 27 51 118; US-PS 31 42 608).The width of the longitudinal weld seam produced depends on known devices in which the welding element pa is arranged parallel to the feed direction, of the width the heated heating element surface. It is not possible to over a certain, relatively small width step because un very broadly trained heating conductors even heating of between the heating conductor and the backing surface clamped film webs takes place; when using wide heating elements, those on the heating conductor adjacent film surfaces in the edge areas because of larger heat radiation less heated than on average area, so that wide, homogeneous welds cannot be produced. (DE-PS 27 51 118; US-PS 31 42 608).
Aus der US-PS 27 11 779 ist eine Vorrichtung zur Erzeugung einer Trennschweißnaht bekannt, welche ein U-förmiges Trenn schweißmesser verwendet, das gegenüber der Vorschubrichtung der Folienbahnen schräggestellt werden kann, um die Festig keit der erzeugten Verschlußnaht zu variieren. Bei dieser bekannten Vorrichtung erfolgt das Verschweißen und Trennen der aufeinanderliegenden Folienbahnen im wesentlichen mit tels der vorderen Kante des beheizten Trennschweißmessers, der Rest des Trennschweißmessers dient nur noch zur Ver festigung der Trennschweißkante nach dem eigentlichen Trenn vorgang. Mit dieser Vorrichtung sind unterschiedlich breite Schweißnähte, bei denen keine Trennung erfolgt, nicht her stellbar.From US-PS 27 11 779 is a device for generation a separating weld seam known, which is a U-shaped separation welding knife used, that opposite the feed direction the film webs can be inclined to the Festig speed of the generated closure seam to vary. At this known device, the welding and separation of the foil sheets lying one on top of the other the front edge of the heated cutting welding knife, the rest of the cut-off welding knife is only used for ver strengthening of the separation welding edge after the actual separation process. With this device are different widths No welds where there is no separation adjustable.
Eine weitere Schwierigkeit, die sich bei bekannten Heizele menten ergibt, ist daß auch in Längsrichtung eine homogene Temperaturverteilung nicht erreichbar ist, da das Heizele ment im Zufuhrbereich mit kalter Folie in Berührung kommt, die sich jedoch beim Vorschieben zunehmend aufheizt, so daß bei gleicher Heizleistung des Heizelementes pro Längenein heit in einem weiter vorgeschobenen Bereich eine wesentlich höhere Temperatur der Folien auftritt als im Einlaufbe reich an den Heizleitern. Es kann dabei zum Durchschmelzen der Folien kommen.Another difficulty with known Heizele ment results that is even in the longitudinal direction a homogeneous Temperature distribution is not achievable because the heating comes into contact with cold foil in the feed area, which, however, increasingly heats up during advancement, so that with the same heating output of the heating element per length essential in a further advanced area higher temperature of the foils occurs than in the inlet rich in heating conductors. It can melt through of the slides are coming.
Es ist Aufgabe der Erfindung, eine gattungsgemäße Vorrich tung derart weiterzubilden, daß mit ihr beliebig breite Schweißnähte herstellbar sind, wobei gleichzeitig im gesam ten Schweißbereich homogene und kontrollierbare Temperatur bedingungen eingehalten werden können.It is an object of the invention, a generic Vorrich tion in such a way that with it any width Welds can be produced, while at the same time in total homogeneous and controllable temperature conditions can be met.
Diese Aufgabe wird bei einer Vorrichtung der eingangs be schriebenen Art erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruches 1 gelöst.This task is in a device of the beginning written type according to the invention by the characterizing Features of claim 1 solved.
Durch diesen schrägen Verlauf, bei dem vorzugsweise der Winkel zwischen der Vorschubrichtung und dem Schweißelement zwischen 1° und 15° liegt, kommen beim Vorschub der Folien bahnen nacheinander immer neue Bereiche der Folienbahnen mit dem Heizelement in Berührung, während andererseits beim Vorschub der Folienbahnen bereits verschweißte Bereiche sich wieder vom Heizelement lösen. Die Verschweißung der Folie schreitet also beim Vorschieben der Folie längs der Vorschubbahn quer zu dieser kontinuierlich fort, so daß ein bestimmter Schweißnahtbereich immer nur über eine ganz be stimmte, unter Umständen relativ kurze Vorschubstrecke mit dem Heizelement in Verbindung steht. Wichtig ist dabei, daß in jeder Längeneinheit des Heizelementes dieses in gleicher Weise immer mit nicht vorgeheizter Folie in Berührung kommt, so daß auch längs des Heizelementes über dessen gesamte Länge gleiche Temperaturverhältnisse herrschen. Die aneinander liegenden und gegeneinander gedrückten Transportriemen, die sich über die gesamte Breite der Schweißnaht und dar über hinaus erstrecken, drücken die miteinander zu ver schweißenden Folien fest gegeneinander und sorgen insbe sondere dafür, daß diese Folien nach der Schweißung dauer haft und spannungsfrei gegeneinander gedrückt werden, so daß die Schweißnaht stabilisiert wird. Da das bandförmige Schweißelement schräg zur Vorschubrichtung verläuft, be deutet dies, daß die Folie nach dem Schweißen unter dem bandförmigen Schweißelement sofort in einen Bereich gelangt, in dem die zusammengeschweißten Folien zwischen den anein anderliegenden Transportriemen gegeneinandergedrückt wer den. Die Transportriemen kühlen dabei den zuvor unter dem Schweißband aufgeheizten Bereich und unterstützen damit die Verfestigung des verschweißten Bereiches, das heißt die Schweißnaht wird dadurch verbessert.Through this oblique course, in which preferably the Angle between the feed direction and the welding element is between 1 ° and 15 ° when the foils are fed successively move new areas of the film webs in contact with the heating element while on the other hand Areas already welded when feeding the film webs detach from the heating element. The welding of the So the film moves along the film when it is pushed forward Feed path transverse to this continuously, so that a certain weld area only ever over a completely agreed, possibly relatively short feed distance is connected to the heating element. It is important that in every unit length of the heating element in the same Always comes into contact with non-preheated film, so that along the heating element over its entire length the same temperature conditions prevail. The one another lying and pressed against each other, which extends across the entire width of the weld and extend beyond, push the ver together welding foils firmly against each other and ensure in particular special for the fact that these foils last after welding are pressed against each other cohesively and without tension, that the weld seam is stabilized. Since the band-shaped Welding element runs obliquely to the feed direction, be this means that the foil after welding under the band-shaped welding element immediately reaches an area, in which the welded foils between each other other transport belts pressed against each other the. The transport belts cool the one under the Sweatband heated area and thus support the Solidification of the welded area, that is, the This improves the weld seam.
Es ist daher bei dieser Vorrrichtung möglich, daß gemäß ei ner bevorzugten Ausführungsform eine Temperaturregelung für das Schweißelement vorgesehen ist, die den Strom im Schweißelement in Funktion des elektrischen Gesamtwider standes des Schweißelementes regelt. Eine solche Regelung kann nur eingesetzt werden, wenn die Temperaturverhältnisse längs des gesamten Heizelementes gleich sind. Bei herkömm lichen Heizelementen, die im Einlaßbereich stärker abgekühlt werden als in einem längs der Vorschubbahn vorgeschobenen Bereich, kann eine solche Gesamtwiderstandsregelung nicht verwendet werden, da sich bei einer solchen Regelung längs des Heizelementes unterschiedliche Temperaturen einstellen würden; insbesondere müßte in einem in Vorschubrichtung fortgeschrittenen Bereich des Heizelementes mit einer ganz erheblichen Zunahme der Temperatur gerechnet werden, die zur Beschädigung der Folienbahnen führen könnte. Bei der über die gesamte Länge gleichmäßigen Wärmeabgabe des schräg zur Vorschubrichtung angeordneten Heizelementes hingegen kann eine solche Gesamtwiderstandsregelung verwendet werden, da alle Teile des Heizelementes in gleicher Weise mit nicht vorgeheizter Folie beschickt werden.It is therefore possible with this device that according to ei ner preferred embodiment, a temperature control is provided for the welding element, the current in Welding element as a function of the total electrical resistance level of the welding element. Such a scheme can only be used if the temperature conditions are the same along the entire heating element. With conventional Lichen heating elements that cooled more in the inlet area are considered to be advanced in a along the feed path Area, such a total resistance regulation cannot can be used, because with such a regulation set different temperatures of the heating element would; in particular should be in a feed direction advanced area of the heating element with a whole significant increase in temperature can be expected could damage the film webs. In the uniform heat emission of the oblique over the entire length to the feed direction arranged heating element, however such a total resistance control can be used since all parts of the heating element in the same way with not preheated film.
Bei einem bevorzugten Ausführungsbeispiel ist vorgesehen, daß das Schweißelement an seinem Anfang und an seinem Ende Bereiche mit niedrigerem elektrischem Widerstand als im Mit telbereich aufweist, vorzugsweise ist das Schweißelement in den Bereichen mit niedrigerem elektrischem Widerstand mit einem Material guter elektrischer Leitfähigkeit beschichtet. Dadurch erfolgt eine Aufheizung des Heizelementes im wesent lichen nur im mittleren Bereich des Heizelementes, so daß durch die kühleren Bereiche eine klare seitliche Begren zung der Schweißnaht erfolgt.In a preferred embodiment, that the welding element at its beginning and at its end Areas with lower electrical resistance than in the Mit tel range, preferably the welding element in areas with lower electrical resistance coated with a material with good electrical conductivity. This essentially heats up the heating element Lichen only in the central area of the heating element, so that a clear side boundary due to the cooler areas the weld is made.
Durch die schräge Führung des Schweißelementes wird es insbesondere möglich, daß das Schweißelement in einem Be reich der Vorschubbahn, in dem die Transportriemen aneinan derlie gen, seitlich zwischen den aneinanderliegenden Transportrie men herausgeführt ist. Dadurch werden die zusammengeschweiß ten Folien auch nach dem Verlassen des Schweißelementes zwi schen den beiden kontinuierlich weiterlaufenden Transportrie men fest gegeneinander gepreßt, so daß in diesem Bereich ei ne Abkühlung der Schweißnaht erfolgen kann, ohne daß eine Un terbrechung des Anpreßdruckes auftritt.Due to the oblique guidance of the welding element, it becomes in particular possible that the welding element in a loading range of the feed path, in which the conveyor belts meet derlie gen, laterally between the adjacent transport men is brought out. This will weld them together ten foils even after leaving the welding element between between the two continuously moving conveyors men pressed firmly against each other, so that egg in this area ne cooling of the weld can take place without an Un Interruption of the contact pressure occurs.
Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:The following description of preferred embodiments the invention serves in connection with the drawing of the detailed explanation. Show it:
Fig. 1 eine Längsschnittansicht der Schweißstation einer Verpackungsmaschine (Schnittansicht längs Linie 1-1 in Fig. 3); Figure 1 is a longitudinal sectional view of the welding station of a packaging machine (sectional view taken along line 1-1 in Fig. 3).
Fig. 2 eine Ansicht ähnlich Fig. 1 mit auseinander geschwenkten Transportriementrägern; FIG. 2 is a view similar to FIG. 1 with the transport arm carriers pivoted apart;
Fig. 3 eine Draufsicht auf die Schweißstation der Fig. 1 in Richtung des Pfeiles A in Fig. 1; Fig. 3 is a plan view of the welding station of Fig. 1 in the direction of arrow A in Fig. 1;
Fig. 4 eine Schnittansicht längs Linie 4-4 in Fig. 1; Fig. 4 is a sectional view taken along line 4-4 in Fig. 1;
Fig. 5 eine Seitenansicht eines Schweißelementhal ters; Fig. 5 is a side view of a welding element holder;
Fig. 6 eine Ansicht des Halters der Fig. 5 von unten; Fig. 6 is a bottom view of the holder of Fig. 5;
Fig. 7 eine Schnittansicht durch eine schmale Längs schweißnaht und Fig. 7 is a sectional view through a narrow longitudinal weld and
Fig. 8 eine Schnittansicht durch eine breite Längs schweißnaht. Fig. 8 is a sectional view through a wide longitudinal weld.
Die in Fig. 1 bis 4 dargestellte Schweißstation ist Teil einer in der Zeichnung nicht wiedergegebenen Verpackungsma schine, in der längs einer Vorschubbahn vorgeschobene Gegen stände auf beiden Seiten mit Folienbahnen umhüllt werden, die anschließend in der Schweißstation längs der seitlich überstehenden Randbereiche miteinander verschweißt werden.The welding station shown in FIGS. 1 to 4 is part of a packaging machine not shown in the drawing, in which objects pushed along a feed path are encased on both sides with foil webs, which are then welded together in the welding station along the laterally projecting edge regions.
Die Schweißstation umfaßt einen unteren, mit der Verpackungs maschine verbundenen Träger 1, der eine Antriebsrolle 2 so wie Umlenkrollen 3 und 4 für einen endlos umlaufenden Trans portriemen 5 aufnimmt. Das obere Trum 6 dieses Transportrie mens verläuft unmittelbar neben einer für die zu verpacken den Gegenstände vorgesehenen Vorschubbahn 7 (Fig. 3), die beispielsweise durch ein Förderband gebildet wird. Das obere Trum 6 wird dabei durch eine in der Ebene der Vorschubbahn 7 angeordnete Stützfläche 8 unterstützt, die durch geeignete Federn 9 federnd nach oben gedrückt wird (Fig. 4).The welding station comprises a lower, with the packaging machine connected carrier 1 , the drive roller 2 and pulleys 3 and 4 for an endlessly rotating trans port belt 5 receives. The upper run 6 of this transportrie mens runs directly next to a feed path 7 ( FIG. 3) provided for the objects to be packed, which is formed for example by a conveyor belt. The upper run 6 is supported by a support surface 8 arranged in the plane of the feed path 7 , which is pressed upwards by suitable springs 9 ( FIG. 4).
Oberhalb des Trägers 1 ist ein zweiter Träger 10 angeordnet, der ebenfalls eine Antriebsrolle 11 sowie eine Umlenkrolle für einen zweiten Transportriemen 14 aufnimmt. Der obere Transportriemen verläuft mit seinem unteren Trum 15 unmittel bar oberhalb des oberen Trums 6 des unteren Transportriemens 5. Dabei liegt die Oberseite des unteren Trums 15 an einer Stützfläche 16 an, so daß insgesamt das untere Trum 15 des oberen Transportriemens 14 und das obere Trum 6 des unteren Transportriemens 5 in der Höhe der Vorschubbahn 7 seitlich neben dieser flächig aneinander gedrückt werden. Die Trans portriemen 5 und 14 laufen dabei gegensinnig um.A second carrier 10 is arranged above the carrier 1 and also receives a drive roller 11 and a deflection roller for a second transport belt 14 . The upper conveyor belt runs with its lower run 15 immediately above the upper run 6 of the lower transport belt 5 . The upper side of the lower run 15 bears against a supporting surface 16 , so that overall the lower run 15 of the upper transport belt 14 and the upper run 6 of the lower transport belt 5 are pressed flat against one another laterally next to the latter at the height of the feed path 7 . The Trans port straps 5 and 14 run in opposite directions.
Der Träger 10 des oberen Transportriemens 14 ist um die Achse seiner Antriebsrolle 11 verschwenkbar an dem Maschinengestell gelagert, so daß die beide Träger 10 und 1 in der in Fig. 2 dargestellten Weise auseinandergeschwenkt werden können. Da durch wird der obere Transportriemen 14 vom unteren Transport riemen 5 abgehoben, so daß der Zwischenraum zwischen den bei den Transportriemen frei zugänglich wird. In der in Fig. 1 dargestellten Betriebsposition, in der die beiden Transport riemen flächig aneinanderliegen, wird der obere Träger 10 durch eine in das Gestell eingeschraubte Feststellschraube 17 unter Zwischenlage einer Feder 18 gegen den unteren Träger gedrückt (Fig. 4). Zum Auseinanderschwenken der beiden Trä ger muß diese Feststellschraube 17 herausgeschraubt werden.The carrier 10 of the upper conveyor belt 14 is pivotally mounted on the machine frame about the axis of its drive roller 11 , so that the two carriers 10 and 1 can be pivoted apart in the manner shown in FIG. 2. Since the upper transport belt 14 is lifted from the lower transport belt 5 so that the space between the conveyor belts is freely accessible. In the operating position shown in FIG. 1, in which the two transport belts lie flat against one another, the upper carrier 10 is pressed against the lower carrier by a locking screw 17 screwed into the frame with the interposition of a spring 18 ( FIG. 4). To pivot the two Trä ger this screw 17 must be unscrewed.
Am oberen Träger 10 ist ein Halter 19 mit einem horizontalen Steg 20 und an dessen Enden angeordneten, senkrecht nach un ten abstehenden Armen 21 und 22 gehalten. Die Arme 21 und 22 tragen an ihren freien Enden jeweils eine Spanneinrich tung 23 beziehungsweise 24 für ein Metallband 25, das in die sen Spanneinrichtungen 23 und 24 so eingespannt werden kann, daß es die freien Enden der Arme 21 und 22 parallel zum Steg 20 laufend miteinander verbindet (Fig. 5).On the upper support 10 is a holder 19 with a horizontal web 20 and arranged at the ends, perpendicular to the un projecting arms 21 and 22 . The arms 21 and 22 carry at their free ends a Spanneinrich device 23 and 24 for a metal strip 25 , which can be clamped in the sen clamping devices 23 and 24 so that it runs the free ends of the arms 21 and 22 parallel to the web 20 connects with each other ( Fig. 5).
Die Spanneinrichtungen 23 und 24 sind dabei in Längsrichtung des Steges 20 seitlich versetzt, so daß das Metallband 25 mit der Längsachse des Steges 20 einen spitzen Winkel ein schließt, der in der Größenordnung zwischen 1 und 15°, vor zugsweise bei beispielsweise 5 bis 8° liegt (Fig. 6).The tensioning devices 23 and 24 are laterally offset in the longitudinal direction of the web 20 , so that the metal strip 25 forms an acute angle with the longitudinal axis of the web 20 , which is of the order of magnitude between 1 and 15 °, preferably at, for example, 5 to 8 ° lies ( Fig. 6).
Das Metallband 25 ist in seinen beiden Endbereichen 26 und 27 mit einem Material guter Leitfähigkeit beschichtet, bei spielsweise mit Kupfer, während der Mittelbereich 28 keine derartige Beschichtung trägt. Dadurch weist der Mittelbe reich 28 einen wesentlich höheren elektrischen Widerstand auf als die Endbereiche 26 und 27.The metal strip 25 is coated in its two end regions 26 and 27 with a material of good conductivity, for example with copper, while the central region 28 does not have such a coating. Characterized the Mittelbe rich 28 has a significantly higher electrical resistance than the end regions 26 and 27th
Der Halter 19 mit dem Metallband 25 ist mittels einer am Steg 20 befestigten Halteplatte 29 lösbar am oberen Träger 10 befestigt. Dazu weist die Halteplatte ein seitlich offe nes Langloch 30 auf, durch welches ein am Träger 10 gehalte ner Gewindebolzen 31 hindurchragt, auf den eine mit Betäti gungsgriff 32 versehene Haltemutter 33 aufschraubbar ist (Fig. 1 und 4). Wenn der Halter 19 am oberen Träger 10 in der vorgesehenen Weise befestigt ist, verläuft das Metall band 25 zwischen dem unteren Trum 15 des oberen Transport riemens 14 und dem oberen Trum 6 des unteren Transportrie mens 5, wobei der eine Endbereich 26 vor der Zusammenfüh rung der beiden Transportriemen beginnt, während der andere Endbereich 27 im Anlagebereich der beiden Transportriemen seitlich zwischen den beiden Transportriemen austritt (Fig. 3). Der Steg 20 wird dabei mit seiner Längsachse parallel zu der durch die Transportriemen 5 und 14 definierten Vor schubrichtung angeordnet, so daß das Metallband 25 seiner seits schräg zur Vorschubrichtung angeordnet ist, wie dies aus Fig. 3 erkennbar ist.The holder 19 with the metal band 25 is detachably fastened to the upper carrier 10 by means of a holding plate 29 fastened to the web 20 . For this purpose, the holding plate has a laterally open slot 30 through which a threaded bolt 31 held on the support 10 projects, onto which a holding nut 33 provided with actuating handle 32 can be screwed (FIGS . 1 and 4). If the holder 19 is attached to the upper support 10 in the intended manner, the metal band 25 extends between the lower run 15 of the upper transport belt 14 and the upper run 6 of the lower transport men 5 , the one end region 26 before the union the two transport belts begin, while the other end region 27 emerges laterally in the contact region of the two transport belts between the two transport belts ( FIG. 3). The web 20 is arranged with its longitudinal axis parallel to the defined by the transport belts 5 and 14 before thrust direction, so that the metal strip 25 is arranged on its side obliquely to the feed direction, as can be seen from Fig. 3.
Die beiden Endbereiche 26 und 27 sind in aus der Zeichnung nicht erkennbarer Weise mit den Polen einer in der Zeich nung nicht dargestellten Spannungsquelle verbunden, so daß das Metallband 25 bei Anlegen einer Spannung aufgeheizt wird. Die Aufheizung erfolgt dabei im Mittelbereich 28 we sentlich stärker als in den Endbereichen 26 und 27, da der Widerstand in den Endbereichen geringer ist als im Mittel bereich.The two end regions 26 and 27 are connected in a manner not recognizable from the drawing to the poles of a voltage source, not shown in the drawing, so that the metal strip 25 is heated when a voltage is applied. The heating takes place in the central region 28 we much stronger than in the end regions 26 and 27 , since the resistance in the end regions is lower than in the central region.
Zur Regelung der Temperatur des Metallbandes kann eine in der Zeichnung ebenfalls nicht dargestellte Regelung vorge sehen sein, die eine Meßeinrichtung beinhaltet, mit der der Gesamtwiderstand des Metallbandes 25 festgestellt wird. Die ser nimmt bei Erwärmung des Metallbandes zu. In Abhängigkeit von dem jeweils ermittelten Gesamtwiderstand wird die Hei zung auf die gewünschte Temperatur eingeregelt, wobei die Regelung bei Abnahme des Widerstandes die Stromzufuhr erhöht und umgekehrt.To regulate the temperature of the metal strip can be seen a control also not shown in the drawing, which includes a measuring device with which the total resistance of the metal strip 25 is determined. The water increases when the metal strip is heated. Depending on the total resistance determined in each case, the heating is regulated to the desired temperature, the regulation increasing the current supply when the resistance decreases and vice versa.
Im Betrieb werden die seitlich über die Vorschubbahn 7 vor stehenden Ränder der die auf der Vorschubbahn 7 vorgeschobe nen Gegenstände umgebenden Folienbahnen zwischen die beiden Transportriemen 5 und 14 eingeführt, so daß sie durch die Transportriemen flächig aneinander gepreßt werden. Die Ein führung der Folienbahnen erfolgt dabei unterhalb des Metall bandes 25, das somit flächig an der oberen der beiden Folien anliegt. Durch die Aufheizung des Metallbandes werden die beiden aneinanderliegenden Folien erweicht und beim Vorschie ben in Vorschubrichtung miteinander verschweißt. Durch den schrägen Verlauf des Metallbandes 25 läßt sich eine breite Schweißnaht herstellen, wobei die Breite der Schweißnaht einmal durch den Winkel des Metallbandes gegenüber der Vor schubrichtung bestimmt wird und zum anderen durch die Längs ausdehnung des Mittelbereiches 28. Die beiden flächig anein anderliegenden Transportriemen pressen die Folien über die gesamte Breite der Schweißnaht gegeneinander, wobei der An preßbereich vorzugsweise noch etwas breiter ist als der Schweißnahtbereich. Dadurch werden die miteinander verschweiß ten Teile der aufeinanderliegenden Folien nach dem Verlassen des Metallbandes flächig und verspannungsfrei gegeneinander gepreßt, so daß einerseits die noch heißen, verschweißten Bereiche durch die Transportbänder abgekühlt werden, während andererseits die miteinander verschweißten Folien in diesem Bereich stabilisiert werden, so daß sie spannungs- und fal tenfrei abkühlen können. Es ist dabei besonders vorteilhaft, daß sich die aneinanderliegenden Transportbänder kontinuier lich über die gesamte Breite der Schweißnaht und auch noch über die zu beiden Seiten angrenzenden Bereiche erstrecken, so daß der gesamte Schweißnahtbereich zuverlässig geführt und gegen Faltenbildung, Verspannung und auch gegen lokale Überhitzung geschützt ist, da die Transportriemen eine gleich mäßige Verteilung der Wärme und eine Abkühlung der verschweiß ten Folien ermöglichen.In operation, the side over the feed path 7 before standing edges of the film on the feed path 7 NEN objects surrounding foil webs are inserted between the two transport belts 5 and 14 so that they are pressed flat against each other by the transport belt. The film webs are guided below the metal strip 25 , which thus lies flat against the upper of the two films. By heating the metal strip, the two adjacent foils are softened and welded together in the feed direction ben. Due to the oblique course of the metal strip 25 , a wide weld seam can be produced, the width of the weld seam being determined on the one hand by the angle of the metal strip relative to the direction of advance and on the other hand by the longitudinal extension of the central region 28 . The two transport belts lying flat against one another press the foils against one another over the entire width of the weld seam, the pressing area preferably being somewhat wider than the weld seam area. As a result, the welded parts of the superimposed foils are pressed flat and tension-free against each other after leaving the metal strip, so that on the one hand the hot, welded areas are cooled by the conveyor belts, while on the other hand the foils welded together are stabilized in this area, so that they can cool down without tension and wrinkles. It is particularly advantageous that the adjacent conveyor belts continuously Lich over the entire width of the weld and also extend over the areas adjacent to both sides, so that the entire weld area is reliably guided and protected against wrinkling, tension and also against local overheating , because the conveyor belts enable an even distribution of heat and a cooling of the welded foils.
Während Fig. 7 eine Schweißnaht zeigt, wie sie mit herkömm lichen, parallel zur Vorschubrichtung verlaufenden Schweiß elementen erzeugbar ist, zeigt die Darstellung der Fig. 8 eine breite Schweißnaht, wie sie durch den schrägen Verlauf des Schweißelementes (Metallband 25) herstellbar ist.While Fig. 7 shows a weld as it can be produced with conven union, parallel to the feed direction welding elements, the illustration of Fig. 8 shows a wide weld as it can be produced by the oblique course of the welding element (metal strip 25 ).
Transportriemenpaare mit einem Schweißelement sind in spie gelbildlicher Ausbildung auf beiden Seiten der Vorschubbahn 7 angeordnet (Fig. 3), so daß die den Gegenstand umhüllen den Folienbahnen zu beiden Seiten der Folienbahn in gleicher Weise in Längsrichtung miteinander verschweißt werden.Transport belt pairs with a welding element are arranged in a mirror-image formation on both sides of the feed path 7 ( FIG. 3), so that the object enveloping the film webs are welded to one another in the same way in the longitudinal direction on both sides of the film web.
Claims (6)
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DE19863629497 DE3629497A1 (en) | 1986-08-29 | 1986-08-29 | Device for producing a longitudinal weld seam joining two film webs |
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DE19863629497 DE3629497A1 (en) | 1986-08-29 | 1986-08-29 | Device for producing a longitudinal weld seam joining two film webs |
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DE4213748A1 (en) * | 1992-04-25 | 1993-10-28 | Beck & Co Packautomaten | Device for continuous separation welding of at least two plastic foils lying one on top of the other |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5376219A (en) * | 1991-09-26 | 1994-12-27 | Sealed Air Corporation | High speed apparatus for forming foam cushions for packaging purposes |
DE4205583A1 (en) * | 1992-02-24 | 1993-08-26 | Windmoeller & Hoelscher | SWEATBAND |
CA2066066C (en) * | 1992-04-15 | 2003-01-28 | Arnold Edward Perrett | Heat sealing element for packaging machines which make lap-sealed pouches |
GB9210894D0 (en) * | 1992-05-21 | 1992-07-08 | Du Pont Canada | Heat sealing assembly for pouch-making packaging machines |
CA2279508C (en) * | 1997-02-06 | 2004-05-25 | Du Pont Canada Inc. | Easy-mount sealing element for packaging machines |
NL1020273C2 (en) * | 2002-03-28 | 2003-09-30 | Ideepak Holding B V | Seal device. |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2711779A (en) * | 1950-04-17 | 1955-06-28 | Gen Mills Inc | Method and apparatus for severing and joining layers of thermoplastic material |
US3142608A (en) * | 1960-08-22 | 1964-07-28 | Techtmann Ind Inc | Bag and wrapper sealing and cutoff mechanism |
DE2751118C2 (en) * | 1977-11-16 | 1979-10-18 | Beck, Hans, 7440 Nuertingen | Separation welding device for sheets that are pushed forward and stacked on top of one another |
-
1986
- 1986-08-29 DE DE19863629497 patent/DE3629497A1/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4213748A1 (en) * | 1992-04-25 | 1993-10-28 | Beck & Co Packautomaten | Device for continuous separation welding of at least two plastic foils lying one on top of the other |
Also Published As
Publication number | Publication date |
---|---|
DE3629497A1 (en) | 1988-03-10 |
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D2 | Grant after examination | ||
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8339 | Ceased/non-payment of the annual fee |