CH698082B1 - Nozzle attachment for a hot-air to hot gas welding of plastic webs. - Google Patents

Nozzle attachment for a hot-air to hot gas welding of plastic webs. Download PDF

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Publication number
CH698082B1
CH698082B1 CH00811/05A CH8112005A CH698082B1 CH 698082 B1 CH698082 B1 CH 698082B1 CH 00811/05 A CH00811/05 A CH 00811/05A CH 8112005 A CH8112005 A CH 8112005A CH 698082 B1 CH698082 B1 CH 698082B1
Authority
CH
Switzerland
Prior art keywords
nozzle attachment
nozzle
abrasive body
body elements
elements
Prior art date
Application number
CH00811/05A
Other languages
German (de)
Inventor
Werner Pfammatter
Hansruedi Voney
Original Assignee
Sika Technology Ag
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 Sika Technology Ag filed Critical Sika Technology Ag
Priority to CH00811/05A priority Critical patent/CH698082B1/en
Priority to PCT/EP2006/062060 priority patent/WO2006117397A1/en
Publication of CH698082B1 publication Critical patent/CH698082B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/022—Mechanical pre-treatments, e.g. reshaping
    • B29C66/0224—Mechanical pre-treatments, e.g. reshaping with removal of material
    • B29C66/02245—Abrading, e.g. grinding, sanding, sandblasting or scraping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7373—Joining soiled or oxidised materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/103—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined direct heating both surfaces to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • 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
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

Ein Düsen-Vorsatz (1) für eine Heissluftdüse zum Warmgasschweissen von Kunststoffbahnen weist einen Schleifkörper (5) auf. Dieser Schleifkörper (5) besteht aus mehreren Schleifkörperelementen (3, 4, 6), die auf einer Lagerachse (7) angeordnet sind. Die einzelnen Schleifkörperelemente (3, 4, 6) sind radial gegeneinander versetzbar, d.h. weisen ein radiales Spiel (S) zur Lagerachse (7) auf.A nozzle attachment (1) for a hot air nozzle for hot gas welding plastic sheets has an abrasive body (5). This grinding body (5) consists of a plurality of abrasive body elements (3, 4, 6) which are arranged on a bearing axis (7). The individual abrasive elements (3, 4, 6) are radially offset from each other, i. have a radial clearance (S) to the bearing axis (7).

Description

       

  Die vorliegende Erfindung betrifft einen Düsen-Vorsatz zum Warmgasschweissen von Folien bzw. Kunststoffbahnen gemäss Oberbegriff des Anspruchs 1.

  
Vorrichtungen zum Verschweissen von Kunststoffbahnen finden ihre Verwendung insbesondere beim Verbinden von Kunststoffbahnen zum Abdichten von Hoch- oder Tiefbauten, insbesondere im Erd- und Wasserbau, bspw. bei Flachdächern, Steildächern, zeltartigen Dachkonstruktionen, Schwimmbecken etc. und haben insbesondere den Richtlinien des Deutschen Verbandes für Schweisstechnik "DVS 2225" zu genügen.

  
Zur Warmgasverschweissung derartiger Kunststoffbahnen werden Vorrichtungen verwendet, wie sie bspw. aus der WO 2004/085 759 oder US-6 325 126 bekannt sind. Diese Vorrichtungen weisen ein Warmgasgebläse auf, mit welchem erhitzte Luft mit ca. 250[deg.] bis 600[deg.] Celsius durch eine flache Breitschlitzdüse zwischen die thermoplastischen Folien geblasen wird, um die zu verbindenden Folienbereiche zu erweichen. Die derart plastifizierten Folienbereiche werden anschliessend mit Hilfe von Anpresswalzen oder -rollen miteinander stoffschlüssig verbunden, d.h. verschweisst.

  
Es zeigt sich, dass bei längerer Lagerung der Kunststoffbahnen im Freien, die Oberflächen dieser Bahnen unter Witterungseinflüssen, insb. unter dem Einfluss von Regen, Kälte, Luftverschmutzungen und/oder Sonneneinstrahlung ihre Beschaffenheit verändern. Dies gilt für alle Materialien, aus denen Kunststoffbahnen gefertigt sind. Diese Veränderung in der Beschaffenheit erschwert das einwandfreie Verschweissen der Folien und kann aufwendige Vorarbeiten, insbesondere Reinigungsvorgänge mit lösemittelhaltigen Produkten, erforderlich machen. Es versteht sich, dass daraus resultierende lokale Unterschiede in der Nahtqualität unerwünscht sind.

  
Es ist deshalb mit der EP-1 358 993 auch schon vorgeschlagen worden, die Breitschlitzdüse der Schweissvorrichtungen mit einer der schlitzförmigen Warmgasdüse nachgelagerten Schleifeinrichtung, im Folgenden auch Düsen-Vorsatz genannt, zu versehen. Dieser Düsen-Vorsatz besteht im Wesentlichen aus einer ein- oder mehrteiligen, sich konisch verjüngenden Walzenanordnung und führt zu qualitativ hoch stehenden Schweissverbindungen. Mit diesem Düsen-Vorsatz lassen sich Schweissgeschwindigkeiten von bis zu 3 m/min realisieren, ohne dass die Qualität der Schweissverbindung dadurch beeinträchtigt wird. Es besteht jedoch das Bedürfnis, die Schweissgeschwindigkeit bei gleich bleibender Schweissgüte weiter zu erhöhen und damit auch die Wirtschaftlichkeit der Montage resp. Verlegung der Abdichtungsbahnen zu verbessern.

  
Es ist deshalb Aufgabe der vorliegenden Erfindung, eine Heissluftdüse zur Hochleistungsverschweissung von Kunststoffbahnen zu schaffen, welche es erlaubt, Kunststoffbahnen mit Geschwindigkeiten von mehr als 3 m/min mittels Warmgasschweissen zu verschweissen, ohne dadurch Qualitätseinbussen, insbesondere Schwachstellen, bei der Verschweissung hinnehmen zu müssen. Darüber hinaus soll die Wirtschaftlichkeit bei der Montage resp. Verlegung der Abdichtungssysteme erhöht werden.

  
Diese Aufgabe wird erfindungsgemäss mit einem Düsen-Vorsatz gelöst, welcher die Merkmale des Anspruchs 1 aufweist und insbesondere mit einem Düsen-Vorsatz, welcher einen mehrteiligen Schleifkörper aufweist, dessen einzelne Schleifkörperelemente radial gegeneinander versetzbar sind.

  
Insbesondere werden die Schleifkörperelemente auf einer Lagerachse gehalten und weisen vorteilhafterweise ein unterschiedlich grosses, radiales Spiel (clearance) zur Lagerachse auf. Der Querschnitt des aus diesen Schleifkörperelementen gebildeten Schleifkörpers kann kreisförmig, ellipsenförmig oder tropfenförmig sein. Es versteht sich, dass dieser Schleifkörper auch aus Schleifkörperelementen mit einem kantigen Querschnittsprofil gebildet sein kann. Der gesamte Schleifkörper kann dabei walzenförmig sein oder eine sich konisch verjüngende Form aufweisen. In der Praxis haben sich Schleifkörper bewährt, welche je nach Material der Kunststoffbahnen eine glatte oder strukturierte Oberfläche aufweisen.

   Dabei hat sich gezeigt, dass für die Verschweissung von PVC-Bahnen ein glatter Schleifkörper zu besseren Schweissergebnissen führt, während für die Verschweissung von Bahnen auf Polyolefinbasis die Verwendung eines Schweisskörpers mit einer strukturierten Oberfläche zu einer besseren Verschweissung führt. Dabei wird der Fachmann ohne weiteren erfinderischen Aufwand die für das jeweilige Material geeignetste Strukturierung wählen, insbesondere gerillte oder schraubenartig strukturierte Schleifkörper verwenden. Es versteht sich, dass der erfindungsgemässe Düsen-Vorsatz mit einer Halterung verbunden ist, derart, dass der Düsen-Vorsatz in einfacher Weise am Schweissgerät resp. am Düsenkörper befestigt werden kann und insbesondere während des Betriebs rasch und einfach ausgewechselt werden kann.

  
Die Vorteile des erfindungsgemässen Düsen-Vorsatzes sind dem Fachmann unmittelbar ersichtlich und insbesondere darin zu sehen, dass damit eine Hochleistungsverschweissung, d.h. eine sichere und qualitativ hoch stehende Verschweissung auch mit einer Geschwindigkeit von über 3 m/min, nachgewiesenermassen mit bis zu 5.5 m/min möglich ist. Insbesondere kann die aufwendige Reinigung und Nahtvorbereitung mit teuren Reinigungsmitteln substantiell reduziert werden und verkürzt sich damit die Montagezeit. Darüber hinaus lässt sich dieselbe Schweissvorrichtung durch die Verwendung von auswechselbaren Düsen-Vorsätzen für unterschiedliche Materialien, bspw. auf Basis von Thermoplasten, Elastomeren, Polyolefinen oder anderen Polymeren, verwenden.

  
Im Folgenden soll die Erfindung anhand eines Ausführungsbeispiels und mit Hilfe der Figuren näher erläutert werden. Dabei zeigt:
<tb>Fig. 1:<sep>eine schematische Ansicht einer mit einem Düsen-Vorsatz versehenen Heissluftdüse bekannter Art;


  <tb>Fig. 2:<sep>eine schematische Darstellung eines erfindungsgemässen Düsen-Vorsatzes.

  
Die in Fig. 1 dargestellte Heissluftdüse 11 weist eine schlitzartige Austrittsöffnung 12 auf. Im Bereich dieser Austrittsöffnung 12 des Düsenkörpers 9 sind Perforationen bzw. Kleinstlochungen 10 vorgesehen. Die aus diesen Perforationen austretende Heissluft führt zu einer ersten Erweichung der übereinander angeordneten Folienbahnen. Dieser Austrittsöffnung 12 nachgelagert ist eine Schleifwalze resp. ein Düsen-Vorsatz 1. Dieser Düsen-Vorsatz 1 kann aus mehreren, nebeneinander angeordneten Reibwalzen 3, 4 gebildet sein. Dieser Düsen-Vorsatz 1 wird von einem seitlichen Haltebügel 8 gehalten. Die einzelnen Reibwalzen 3, 4 sind auf einer Achse aufgereiht und bilden eine sich konisch verjüngende Walzenanordnung. Beim Verschweissen zweier Kunststoffbahnen werden diese über den Düsenkörper 9 und den nachgelagerten Düsen-Vorsatz 1 geführt.

   Dabei können sich die einzelnen Reibwalzen 3, 4 in Abhängigkeit von den auf sie wirkenden Reibkräften gegeneinander verdrehen. Diese unterschiedlichen Reibkräfte werden durch Unebenheiten im Bereich der zu bildenden Schweissnaht und durch Unterschiede in der lokalen Oberflächenbeschaffenheit erzeugt.

  
Fig. 2 zeigt eine schematische Darstellung eines erfindungsgemässen Düsen-Vorsatzes 1. Dieser Düsen-Vorsatz 1 weist drei Schleifkörperelemente 3, 4, 6 auf, welche auf einer gemeinsamen Lagerachse 7 gehalten werden. Vorteilhafterweise ist das äusserste Schleifkörperelement 6 mit dieser Lagerachse 7 fest verbunden, insbesondere selbsthemmend verschraubt. Die anderen Schleifkörperelemente 3, 4 weisen eine Bohrung auf, dessen Durchmesser grösser ist als der Durchmesser der Lagerachse 7. Dadurch werden diese Schleifkörperelemente 3, 4 mit einem gewissen Spiel S auf der Lagerachse 7 gehalten. Vorteilhafterweise werden die einzelnen Schleifkörperelemente 3, 4 so ausgebildet, dass diese ein unterschiedlich grosses, radiales Spiel S aufweisen.

   In einer bevorzugten Ausführungsform weist die Lagerachse 7 einen Durchmesser von 3,5 mm auf, während die Schleifkörperelemente 3, 4 jeweils einen Bohrungsdurchmesser von 3,8 resp. 3,6 mm aufweisen. Diese erfindungsgemässe Konstruktion erlaubt es, den lokal unterschiedlichen Reibkräften und den Unebenheiten im Bereich der zu schaffenden Schweissnaht in optimaler Weise Rechnung zu tragen. Insbesondere führt die erfindungsgemässe Beweglichkeit der einzelnen Schleifkörperelemente zu einer wesentlichen Reduktion bei der Bildung von Schlacken, welche die Schweissgüte beeinträchtigen. Es versteht sich, dass der Schleifkörper 5 auch aus vier, fünf oder mehr Schleifkörperelementen gebildet sein kann. Vorteilhafterweise weist der Schleifkörper 5 eine sich konisch verjüngende Form auf, kann aber auch einfacherweise walzenförmig sein.

   Der Querschnitt der einzelnen Schleifkörperelemente 3, 4, 6 kann dabei kreisförmig, ellipsenförmig, flügelprofilförmig oder ein kantiges Profil aufweisen. Es hat sich als besonders vorteilhaft erwiesen, dass die einzelnen Schleifkörperelemente 3, 4, 6 aus einem metallischen Material gefertigt sind, insbesondere aus Wolfram oder einer Kupferlegierung. Es versteht sich, dass diese Schleifkörperelemente 3, 4, 6 auch nur mit einer geeigneten antihaftenden Beschichtung versehen sein können. Der Fachmann wird bei der Wahl eines geeigneten Materials die Temperaturbeständigkeit, Wärmeleitfähigkeit, Verschleissfestigkeit, Korrosionsfestigkeit etc. in Betracht ziehen.

  
In einer Weiterbildung der erfindungsgemässen Schleifkörperelemente 3, 4, 6 weisen diese eine strukturierte Oberfläche auf und sind insbesondere gerillt oder schraubenartig strukturiert. Diese besondere Oberflächengestaltung erlaubt es, den Schleifkörper 5 an die jeweilige Beschaffenheit der zu verschweissenden Kunststoffbahnen optimal anzupassen.

  
Der erfindungsgemässe Düsen-Vorsatz lässt sich in einfacher Weise an bestehende Warmgas-Schweissgeräte jeder Art befestigen, insbesondere auch an Schweissgeräte zur Erzeugung einer Einfach- oder Doppel-Naht. Darüber hinaus lassen sich mit diesem Düsen-Vorsatz auch Dekorprofile oder - zur Imitation von Stehfalzdächern - Battonprofile aus Kunststoff direkt auf bereits verlegte Kunststoffbahnen aufschweissen.



  The present invention relates to a nozzle attachment for hot gas welding of films or plastic sheets according to the preamble of claim 1.

  
Devices for welding of plastic sheets find their use in particular when connecting plastic sheets for sealing civil engineering or civil engineering, especially in earthworks and hydraulic engineering, eg. For flat roofs, pitched roofs, tent-like roof structures, swimming pools, etc. and have in particular the guidelines of the German Association for Welding technology "DVS 2225" suffice.

  
For the hot gas welding of such plastic webs devices are used, as they are known, for example, from WO 2004/085 759 or US Pat. No. 6,325,126. These devices have a hot gas blower with which heated air at about 250 ° C. to 600 ° C. is blown between the thermoplastic films through a flat slot die in order to soften the film areas to be joined. The thus plasticized film areas are then bonded together by means of pressure rollers or rolls cohesively, i. welded.

  
It turns out that during prolonged storage of the plastic sheets outdoors, the surfaces of these tracks under weather conditions, esp. Under the influence of rain, cold, air pollution and / or sunlight change their nature. This applies to all materials from which plastic sheets are made. This change in the texture complicates the proper welding of the films and can make elaborate preparatory work, in particular cleaning operations with solvent-based products required. It is understood that resulting local differences in seam quality are undesirable.

  
It has therefore also been proposed in EP-1 358 993, the slot die of the welding devices with a slit-shaped hot gas nozzle downstream grinding device, also referred to as nozzle attachment to provide. This nozzle attachment consists essentially of a one-piece or multi-part, conically tapered roller arrangement and leads to high quality welded joints. Welding speeds of up to 3 m / min can be achieved with this nozzle attachment without affecting the quality of the welded joint. However, there is a need to continue to increase the welding speed at a constant welding quality and thus also the efficiency of the assembly resp. Laying the waterproofing membranes to improve.

  
It is therefore an object of the present invention to provide a hot air nozzle for high performance welding of plastic sheets, which allows plastic sheets to be welded at speeds of more than 3 m / min by means of hot gas welding, without sacrificing quality, especially weak points, have to accept in the welding. In addition, the economy in the assembly resp. Laying the waterproofing systems can be increased.

  
This object is achieved according to the invention with a nozzle attachment, which has the features of claim 1 and in particular with a nozzle attachment, which has a multi-part grinding body whose individual abrasive elements are radially offset from each other.

  
In particular, the abrasive elements are held on a bearing axis and advantageously have a different size, radial clearance (clearance) to the bearing axis. The cross section of the abrasive article formed from these abrasive elements may be circular, elliptical or teardrop shaped. It is understood that this abrasive body can also be formed from abrasive elements with an angular cross-sectional profile. The entire abrasive body can be cylindrical or have a conically tapering shape. In practice, abrasive articles have proven to have a smooth or textured surface depending on the material of the plastic sheets.

   It has been found that for the welding of PVC webs, a smooth abrasive body leads to better welding results, while for the welding of webs polyolefin based using a welding body with a structured surface leads to a better weld. The skilled person will choose without further inventive effort the most suitable for the particular material structuring, in particular grooved or helically structured abrasive use. It is understood that the inventive nozzle attachment is connected to a holder, such that the nozzle attachment in a simple manner at the welder resp. can be attached to the nozzle body and in particular can be replaced quickly and easily during operation.

  
The advantages of the nozzle attachment according to the invention are immediately apparent to the person skilled in the art and, in particular, can be seen in the fact that a high-performance welding, i. a safe and high-quality welding is also possible with a speed of over 3 m / min, proven with up to 5.5 m / min. In particular, the costly cleaning and seam preparation can be substantially reduced with expensive detergents and thus shortens the assembly time. In addition, the same welding device can be used by the use of replaceable nozzle attachments for different materials, for example. Based on thermoplastics, elastomers, polyolefins or other polymers.

  
In the following, the invention will be explained in more detail with reference to an embodiment and with the aid of the figures. Showing:
<Tb> FIG. 1 is a schematic view of a hot air nozzle of a known type provided with a nozzle attachment;


  <Tb> FIG. 2: <sep> is a schematic representation of an inventive nozzle attachment.

  
The hot air nozzle 11 shown in FIG. 1 has a slot-like outlet opening 12. In the region of this outlet opening 12 of the nozzle body 9 perforations or small perforations 10 are provided. The hot air emerging from these perforations leads to a first softening of the film webs arranged one above the other. Downstream of this outlet opening 12 is a grinding roller, respectively. a nozzle attachment 1. This nozzle attachment 1 can be formed from a plurality of friction rollers 3, 4 arranged side by side. This nozzle attachment 1 is held by a lateral bracket 8. The individual friction rollers 3, 4 are lined up on an axis and form a conically tapering roller arrangement. When welding two plastic sheets they are guided over the nozzle body 9 and the downstream nozzle attachment 1.

   In this case, the individual friction rollers 3, 4 rotate in response to the frictional forces acting on them against each other. These different frictional forces are generated by unevenness in the area of the weld seam to be formed and by differences in the local surface condition.

  
FIG. 2 shows a schematic representation of a nozzle attachment 1 according to the invention. This nozzle attachment 1 has three abrasive body elements 3, 4, 6, which are held on a common bearing axis 7. Advantageously, the outermost abrasive element 6 is firmly connected to this bearing axis 7, in particular self-locking screwed. The other abrasive body elements 3, 4 have a bore whose diameter is greater than the diameter of the bearing axis 7. As a result, these abrasive body elements 3, 4 are held with a certain play S on the bearing axis 7. Advantageously, the individual abrasive body elements 3, 4 are formed so that they have a different size, radial clearance S.

   In a preferred embodiment, the bearing axis 7 has a diameter of 3.5 mm, while the abrasive body elements 3, 4 each have a bore diameter of 3.8 resp. 3.6 mm. This construction according to the invention makes it possible to optimally take account of the locally different frictional forces and the irregularities in the region of the weld seam to be created. In particular, the inventive mobility of the individual abrasive elements leads to a significant reduction in the formation of slags, which affect the quality of welding. It is understood that the grinding body 5 can also be formed from four, five or more abrasive body elements. Advantageously, the grinding wheel 5 has a conically tapered shape, but may also be simple cylindrical.

   The cross section of the individual abrasive elements 3, 4, 6 may be circular, elliptical, wing profile or have an angular profile. It has proved to be particularly advantageous that the individual abrasive body elements 3, 4, 6 are made of a metallic material, in particular of tungsten or a copper alloy. It is understood that these abrasive elements 3, 4, 6 can also be provided only with a suitable non-stick coating. One skilled in the art will consider temperature resistance, thermal conductivity, wear resistance, corrosion resistance, etc. when choosing a suitable material.

  
In a development of the inventive abrasive body elements 3, 4, 6, these have a structured surface and are in particular grooved or helically structured. This special surface design makes it possible to optimally adapt the grinding wheel 5 to the particular condition of the plastic webs to be welded.

  
The nozzle attachment according to the invention can be fastened in a simple manner to existing hot-gas welding devices of any kind, in particular also to welding devices for producing a single or double seam. In addition, decorative profiles or - for the imitation of standing seam roofs - Batton profiles made of plastic can be welded directly onto already laid plastic sheets with this nozzle attachment.

Claims (1)

Düsen-Vorsatz (1) für eine Heissluftdüse zum Warmgasschweissen von Kunststoffbahnen, welcher Düsen-Vorsatz (1) mehrere, einen Schleifkörper (5) bildende Schleifkörperelemente (3, 4, 6) aufweist, welche Schleifkörperelemente (3, 4, 6) auf einer Lagerachse (7) gehalten sind, dadurch gekennzeichnet, dass die einzelnen Schleifkörperelemente (3, 4, 6) radial gegeneinander versetzbar sind. A nozzle attachment (1) for a hot air nozzle for hot gas welding of plastic webs, which nozzle attachment (1) a plurality of, an abrasive body (5) forming abrasive body elements (3, 4, 6), which abrasive elements (3, 4, 6) on a Bearing axis (7) are held, characterized in that the individual abrasive body elements (3, 4, 6) are radially offset from one another. Düsen-Vorsatz (1) nach Anspruch 1, dadurch gekennzeichnet, dass die einzelnen Schleifkörperelemente (3, 4, 6) ein unterschiedlich grosses, radiales Spiel (S) zur Lagerachse (7) aufweisen. Nozzle attachment (1) according to claim 1, characterized in that the individual abrasive body elements (3, 4, 6) have a different size, radial clearance (S) to the bearing axis (7). Düsen-Vorsatz (1) nach Anspruch 2, dadurch gekennzeichnet, dass der Querschnitt der Schleifkörperelemente (3, 4, 6) kreis-, ellipsen- oder tropfenförmig ist. Nozzle attachment (1) according to claim 2, characterized in that the cross section of the abrasive body elements (3, 4, 6) is circular, elliptical or teardrop-shaped. Düsen-Vorsatz (1) nach Anspruch 2, dadurch gekennzeichnet, dass die Schleifkörperelemente (3, 4, 6) aus einem metallischen Material gefertigt sind. Nozzle attachment (1) according to claim 2, characterized in that the abrasive body elements (3, 4, 6) are made of a metallic material. Düsen-Vorsatz (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Schleifkörper (5) walzenförmig ist oder eine sich konisch verjüngende Form aufweist. Nozzle attachment (1) according to one of claims 1 to 4, characterized in that the grinding body (5) is cylindrical or has a conically tapered shape. Düsen-Vorsatz (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die einzelnen Schleifkörperelemente (3, 4, 6) eine glatte oder strukturierte Oberfläche aufweisen. Nozzle attachment (1) according to one of claims 1 to 5, characterized in that the individual abrasive body elements (3, 4, 6) have a smooth or textured surface. Düsen-Vorsatz (1) nach Anspruch 6, dadurch gekennzeichnet, dass die einzelnen Schleifkörperelemente (3, 4, 6) gerillt oder schraubenartig strukturiert sind. Nozzle attachment (1) according to claim 6, characterized in that the individual abrasive body elements (3, 4, 6) are grooved or helically structured. Heissluftdüse zum Verschweissen von Kunststoffbahnen, dadurch gekennzeichnet, dass diese einen Düsen-Vorsatz (1) gemäss Anspruch 1 aufweist. Hot air nozzle for welding plastic webs, characterized in that it comprises a nozzle attachment (1) according to claim 1. Heissluftdüse nach Anspruch 8, dadurch gekennzeichnet, dass die Lagerachse (7) des Düsen-Vorsatzes (1) mit einem Haltebügel (8) verbindbar ist. Hot air nozzle according to claim 8, characterized in that the bearing axis (7) of the nozzle attachment (1) with a headband (8) is connectable. Heissluftdüse nach Anspruch 9, dadurch gekennzeichnet, dass der Haltebügel (8) derart ausgebildet ist, dass der Düsen-Vorsatz (1) auswechselbar ist. Hot air nozzle according to claim 9, characterized in that the retaining clip (8) is designed such that the nozzle attachment (1) is replaceable.
CH00811/05A 2005-05-04 2005-05-04 Nozzle attachment for a hot-air to hot gas welding of plastic webs. CH698082B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH00811/05A CH698082B1 (en) 2005-05-04 2005-05-04 Nozzle attachment for a hot-air to hot gas welding of plastic webs.
PCT/EP2006/062060 WO2006117397A1 (en) 2005-05-04 2006-05-04 Nozzle attachment for a device used for hot-gas welding plastic webs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00811/05A CH698082B1 (en) 2005-05-04 2005-05-04 Nozzle attachment for a hot-air to hot gas welding of plastic webs.

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CH698082B1 true CH698082B1 (en) 2009-05-15

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1884347A1 (en) * 2006-08-04 2008-02-06 Sika Technology AG Apparatus for welding webs of plastic material
DE202017106063U1 (en) * 2017-10-06 2018-01-24 Leister Technologies Ag Contact welding heating component and automatic welding machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0914935B1 (en) * 1998-03-09 2001-05-23 Sarna Patent- Und Lizenz-Ag Apparatus for welding webs of plastic material
ATE453502T1 (en) * 2002-04-29 2010-01-15 Sika Technology Ag DEVICE FOR WELDING PLASTIC TRACKS

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