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CH376652A - Method and device for welding tubular nets made of thermoplastic material - Google Patents

Method and device for welding tubular nets made of thermoplastic material

Info

Publication number
CH376652A
CH376652A CH342660A CH342660A CH376652A CH 376652 A CH376652 A CH 376652A CH 342660 A CH342660 A CH 342660A CH 342660 A CH342660 A CH 342660A CH 376652 A CH376652 A CH 376652A
Authority
CH
Switzerland
Prior art keywords
welded
cut
length
tubular
strips
Prior art date
Application number
CH342660A
Other languages
German (de)
Inventor
Engelhardt Wolfgang
Original Assignee
Norddeutsche Seekabelwerke 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 Norddeutsche Seekabelwerke Ag filed Critical Norddeutsche Seekabelwerke Ag
Priority to CH342660A priority Critical patent/CH376652A/en
Publication of CH376652A publication Critical patent/CH376652A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • 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
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5042—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like covering both elements 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/50—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like
    • B29C65/5064—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped
    • B29C65/5078—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding using adhesive tape, e.g. thermoplastic tape; using threads or the like of particular form, e.g. being C-shaped, T-shaped and being composed by several elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3032—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined
    • B29C66/30325—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B32B37/1027—Pressing using at least one press band
    • 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
    • B29C66/70—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
    • B29C66/80—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2028/00—Nets or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • B29L2031/7129—Bags, sacks, sachets open

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

  

  
 



  Verfahren und Einrichtung zum Zuschweissen schlauchförmiger Netze aus thermoplastischem Kunststoff
Bei der Herstellung von beutelartigen Gebilden aus schlauchförmigen Netzen ist es erforderlich, die Netze an einem Ende dauerhaft zu verschliessen. Bei Netzen aus thermoplastischem Kunststoff, z. B. aus Polyvinylchlorid, Polyäthylen, Polyamid oder dergleichen, werden die schlauchförmigen Netze zu diesem Zweck an einem Ende zugeschweisst. Dies geschieht bisher in der Weise, dass man das Netz an dem zu verschliessenden Ende durch eine Klammer zusammenfasst und zwischen Elektroden erhitzt.



  Dabei werden aber nur die jeweils in der Klammer aufeinanderliegenden Fäden des Netzes miteinander verschweisst. Die mechanische Festigkeit der Schweissstellen ist daher sehr von Zufälligkeiten abhängig und der später beim Gebrauch der Beutel auftretenden Beanspruchung häufig nicht gewachsen.



   Die Erfindung zielt darauf hin, die geschilderten Nachteile zu vermeiden. Das Verfahren gemäss der Erfindung ist dadurch gekennzeichnet, dass an der Aussenseite des schlauchförmigen Netzes, einander gegenüberliegend, Streifen aus thermoplastischem Kunststoff aufgelegt und durch das Netz hindurch unter Druck und Wärme miteinander verschweisst werden. Die zu verbindenden Netzteile sollen dabei zwischen den genannten Kunststoffstreifen form- und stoffschlüssig eingebettet und hierbei gleichzeitig durch die Kunststoffstreifen die Verbindungsstelle besonders verstärkt werden.



   Eine besonders geeignete Einrichtung für die Durchführung dieses Verfahrens besitzt zwei mittels Rollenpaaren gleichlaufend und einander unter Druck anliegend geführte Metallbänder, zwischen denen das zu verschweissende schlauchförmige Netz zusammen mit den thermoplastischen Kunststoffstreifen eingelegt wird, sowie, entlang der genannten Metallbänder hintereinander angeordnet, eine Heizvorrichtung zum Schweissen und eine Kühlvorrichtung zum Kühlen des Netzes.



   Die Zeichnung zeigt beispielsweise schematisch eine Einrichtung für die Durchführung des Verfahrens nach der Erfindung.



   Es bezeichnen 1 die beiden Metallbänder, vorzugsweise zwei Stahlbänder, die über die Rollenpaare 2 und 3 laufen und dabei zwischen diesen gleichlaufend und aufeinandergepresst geführt werden.



  Auf dem Wege der Metallbänder 1 sind eine Heizvorrichtung 4 und eine Kühlvorrichtung 5 in der Laufrichtung der Bänder 1 hintereinander angeordnet. 6 sind zwei Vorratsscheiben und 7 zwei   Leit-    rollen für die zum Schweissen verwendeten Kunststoffstreifen 8. Hinter dem letzten Rollenpaar 3 der Metallbandführung ist eine Schere 9 für die Kunststoffstreifen eingebaut.



   Die vorher auf Länge zugeschnittenen Netze 10 werden in solcher Lage, dass der zu verschweissende Teil, zum Beispiel der zu verschweissende Rand, in die Laufrichtung der Metallbänder 1 fällt, zwischen den von den Scheiben 6 über die Leitrollen 7 ablaufenden Kunststoffstreifen 8 eingeführt und zusammen mit den Kunststoffstreifen durch die Metallbänder 1 erfasst, wobei die Kunststoffstreifen unter dem Anpressdruck des Rollenpaares 2 beiderseitig und einander gegenüberliegend auf das flach zusammengelegte schlauchförmige Netz 10 aufgepresst werden.



  Auf dem Wege zwischen den Metallbändern 1 werden die beiden Kunststoffstreifen in der Heizvorrichtung 4 miteinander und mit dem Netz yerschweisst und in der Kühlvorrichtung 5 gekühlt. Die überstehenden Teile der Kunststoffstreifen 7 werden alsdann mittels der Schere 9 abgeschnitten.



   Zur Herstellung von Beuteln können die Netze nach dem Verfahren der Erfindung beispielsweise  auf die Länge eines Beutels zugeschnitten und alsdann an dem einen Ende zugeschweisst werden. Die Netze können aber auch auf die doppelte Länge eines Beutels zugeschnitten und dann entweder auf halber Länge zugeschweisst und längs der Mitte der Schweissnaht durchgeschnitten oder an beiden Enden zugeschweisst und auf halber Länge durchgeschnitten werden. Der Streifen aus thermoplastischem Material kann gleichzeitig als Schweissnahtträger und als Trägerstreifen für die Etikettierung des fertigen Beutels verwendet werden. Dies kann beispielsweise dadurch geschehen, dass der nach dem Verschweissen überstehende Teil des Streifens, gegebenenfalls nach entsprechender Zuschneidung selbst als Etikette bzw.



  Träger für eine Papieretikette dient.   



  
 



  Method and device for welding tubular nets made of thermoplastic material
When producing bag-like structures from tubular nets, it is necessary to permanently close the nets at one end. For networks made of thermoplastic material, e.g. B. made of polyvinyl chloride, polyethylene, polyamide or the like, the tubular nets are welded at one end for this purpose. So far, this has been done in such a way that the mesh is held together at the end to be closed by a clamp and heated between electrodes.



  However, only the threads of the network lying on top of one another in the clamp are welded to one another. The mechanical strength of the welds is therefore very dependent on randomness and is often not able to cope with the stress that occurs later when the bag is used.



   The invention aims to avoid the disadvantages outlined. The method according to the invention is characterized in that on the outside of the tubular net, opposite one another, strips of thermoplastic material are placed and welded together through the net under pressure and heat. The network parts to be connected are to be embedded between the named plastic strips in a form-fitting and material-locking manner and, at the same time, the connection point is to be particularly reinforced by the plastic strips.



   A particularly suitable device for carrying out this process has two metal strips running parallel to each other by means of pairs of rollers and resting against each other under pressure, between which the tubular network to be welded is inserted together with the thermoplastic strips, as well as a heating device for welding, arranged one behind the other along the said metal strips and a cooling device for cooling the network.



   The drawing shows, for example, schematically a device for carrying out the method according to the invention.



   1 denotes the two metal belts, preferably two steel belts, which run over the pairs of rollers 2 and 3 and are guided between them in the same direction and pressed against one another.



  On the way of the metal strips 1, a heating device 4 and a cooling device 5 are arranged one behind the other in the running direction of the strips 1. 6 are two storage disks and 7 are two guide rollers for the plastic strips 8 used for welding. A pair of scissors 9 for the plastic strips is installed behind the last pair of rollers 3 of the metal strip guide.



   The nets 10 previously cut to length are in such a position that the part to be welded, for example the edge to be welded, falls in the running direction of the metal strips 1, are inserted between the plastic strips 8 running off the discs 6 over the guide rollers 7 and together with the plastic strip is grasped by the metal strips 1, the plastic strips being pressed onto the flat folded tubular net 10 on both sides and opposite one another under the pressure of the roller pair 2.



  On the way between the metal strips 1, the two plastic strips are welded to one another and to the mesh in the heating device 4 and are cooled in the cooling device 5. The protruding parts of the plastic strips 7 are then cut off by means of scissors 9.



   For the production of bags, the nets can be cut to the length of a bag according to the method of the invention, for example, and then welded shut at one end. However, the nets can also be cut to twice the length of a bag and then either welded halfway and cut along the center of the weld seam or welded shut at both ends and cut through halfway. The strip of thermoplastic material can be used at the same time as a weld seam carrier and as a carrier strip for labeling the finished bag. This can be done, for example, by using the part of the strip that protrudes after welding, if necessary after being cut to size, as a label or



  Carrier for a paper label is used.

Claims (1)

PATENTANSPRUCH 1 Verfahren zum Zuschweissen schlauchförmiger Netze, dadurch gekennzeichnet, dass an der Aussenseite des schlauchförmigen Netzes, einander gegen überliegend, Streifen aus thermoplastischem Kunststoff aufgelegt und durch das Netz hindurch unter Druck und Wärme miteinander verschweisst werden. PATENT CLAIM 1 Method for welding tubular nets, characterized in that on the outside of the tubular net, opposite one another, strips of thermoplastic material are placed and welded through the net under pressure and heat. UNTERANSPRÜCHE 1. Verfahren gemäss Patentanspruch I, dadurch gekennzeichnet, dass das schlauchförmige Netz auf die Länge eines herzustellenden Beutels zugeschnitten und an dem einen Ende zugeschweisst wird. SUBCLAIMS 1. The method according to claim I, characterized in that the tubular network is cut to the length of a bag to be produced and is welded shut at one end. 2. Verfahren gemäss Patentanspruch I, dadurch gekennzeichnet, dass das schlauchförmige Netz auf die doppelte Länge eines herzustellenden Beutels zugeschnitten, auf halber Länge zugeschweisst und längs der Mitte der Schweissnaht durchgeschnitten wird. 2. The method according to claim I, characterized in that the tubular network is cut to twice the length of a bag to be manufactured, welded to half the length and cut through along the center of the weld seam. 3. Verfahren gemäss Patentanspruch I, dadurch gekennzeichnet, dass das schlauchförmige Netz auf die doppelte Länge eines herzustellenden Beutels zugeschnitten, an beiden Enden zugeschweisst und auf halber Länge durchgeschnitten wird. 3. The method according to claim I, characterized in that the tubular network is cut to twice the length of a bag to be manufactured, welded at both ends and cut through at half its length. 4. Verfahren nach Patentanspruch I, dadurch gekennzeichnet, dass der thermoplastische Streifen zugleich als Schweissnahtträger und als Trägerstreifen für die Etikettierung verwendet wird. 4. The method according to claim I, characterized in that the thermoplastic strip is used at the same time as a weld seam carrier and as a carrier strip for labeling. PATENTANSPRUCH II Schweisseinrichtung zur Durchführung des Verfahrens nach Patentanspruch I, gekennzeichnet durch zwei mittels Rollenpaaren gleichlaufend und einander unter Druck anliegend geführte Metallbänder, zwischen denen das zu verschweissende schlauchförmige Netz zusammen mit den thermoplastischen Kunststoffstreifen eingelegt wird, sowie entlang der genannten Metallbänder hintereinander angeordnet, eine Heizvorrichtung zum Schweissen und eine Kühlvorrichtung zum Kühlen des Netzes. PATENT CLAIM II Welding device for carrying out the method according to claim 1, characterized by two metal strips running in parallel by means of pairs of rollers and resting against each other under pressure, between which the tubular network to be welded is inserted together with the thermoplastic plastic strips, and a heating device for welding arranged one behind the other along said metal strips and a cooling device for cooling the network.
CH342660A 1960-03-25 1960-03-25 Method and device for welding tubular nets made of thermoplastic material CH376652A (en)

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CH342660A CH376652A (en) 1960-03-25 1960-03-25 Method and device for welding tubular nets made of thermoplastic material

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CH342660A CH376652A (en) 1960-03-25 1960-03-25 Method and device for welding tubular nets made of thermoplastic material

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058045A2 (en) * 1981-02-10 1982-08-18 Ube Industries, Ltd. Improved process and apparatus for preparing laminated heat-shrinkable strip with electric conductor wire embedded therein
EP0097598A1 (en) * 1982-06-22 1984-01-04 Jacques Tisserand Method and device for gathering data and for continuous transfer reproduction
FR2532881A1 (en) * 1982-09-09 1984-03-16 Tisserand Jacques Method and equipment for plastic coating a succession of cards.
EP0134820A1 (en) * 1983-07-01 1985-03-27 Roland Melzer Method of producing plastic cards
FR2599669A1 (en) * 1986-06-10 1987-12-11 Tech Indles Plastification MACHINE FOR PLASTICIZING A FLAT-FORM ELEMENT BY APPLYING AND FUSIONING A THERMO-PLASTIC FILM
WO1996032255A1 (en) * 1995-04-10 1996-10-17 Minnesota Mining And Manufacturing Company Two-stage laminator apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058045A2 (en) * 1981-02-10 1982-08-18 Ube Industries, Ltd. Improved process and apparatus for preparing laminated heat-shrinkable strip with electric conductor wire embedded therein
EP0058045A3 (en) * 1981-02-10 1985-01-23 Ube Industries, Ltd. Improved process and apparatus for preparing laminated heat-shrinkable strip with electric conductor wire embedded therein
EP0097598A1 (en) * 1982-06-22 1984-01-04 Jacques Tisserand Method and device for gathering data and for continuous transfer reproduction
FR2532881A1 (en) * 1982-09-09 1984-03-16 Tisserand Jacques Method and equipment for plastic coating a succession of cards.
EP0134820A1 (en) * 1983-07-01 1985-03-27 Roland Melzer Method of producing plastic cards
US4863546A (en) * 1983-07-01 1989-09-05 Roland Melzer Apparatus and method for manufacturing plastic cards
FR2599669A1 (en) * 1986-06-10 1987-12-11 Tech Indles Plastification MACHINE FOR PLASTICIZING A FLAT-FORM ELEMENT BY APPLYING AND FUSIONING A THERMO-PLASTIC FILM
EP0249526A1 (en) * 1986-06-10 1987-12-16 Techniques Industrielles De Plastification Machine for coating a flat element by applying and fusing a thermoplastic film
WO1996032255A1 (en) * 1995-04-10 1996-10-17 Minnesota Mining And Manufacturing Company Two-stage laminator apparatus

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