WO2010091708A1 - Method and apparatus for welding plastic films - Google Patents

Method and apparatus for welding plastic films Download PDF

Info

Publication number
WO2010091708A1
WO2010091708A1 PCT/EP2009/008134 EP2009008134W WO2010091708A1 WO 2010091708 A1 WO2010091708 A1 WO 2010091708A1 EP 2009008134 W EP2009008134 W EP 2009008134W WO 2010091708 A1 WO2010091708 A1 WO 2010091708A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
plastic films
servomotor
bar
welding bar
Prior art date
Application number
PCT/EP2009/008134
Other languages
German (de)
French (fr)
Inventor
Ingo Bengsch
Original Assignee
Lemo Maschinenbau Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lemo Maschinenbau Gmbh filed Critical Lemo Maschinenbau Gmbh
Publication of WO2010091708A1 publication Critical patent/WO2010091708A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/8225—Crank mechanisms
    • 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
    • B29C66/824—Actuating mechanisms
    • B29C66/8246—Servomechanisms, e.g. servomotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
    • 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
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution
    • 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
    • B29C66/9392—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges in explicit relation to another variable, e.g. speed diagrams
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/944—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the time
    • 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
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/52—Folding sheets, blanks or webs by reciprocating or oscillating members, e.g. fingers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/146—Closing bags

Definitions

  • the invention relates to a method for welding plastic films, in which at least two plastic films are heated one above the other by at least one welding element, which is driven by a servomotor up and down and a device for welding plastic films for the production of bags, bags or the like.
  • bags or the like from thermoplastic films are known to be passed over the films to be welded superimposed between heatable welding elements and joined together by heating.
  • the films are advanced in cycles and heated by at least one movable up and down bar-shaped welding element at a standstill for a certain time.
  • the invention is therefore based on the object to provide a method with which welds can be produced with improved quality with reduced mechanical complexity. Another object is to carry out an apparatus for carrying out a method according to the invention.
  • Claim 10 solves the second task.
  • the method and apparatus of the invention are suitable for transverse and / or longitudinal welding of plastic film, preferably for transverse welding.
  • the plastic films are welded together by means of welding element.
  • the welding element can be used for separating welding, during which the films are additionally separated by the welding bar during welding.
  • the rotational movement of the servomotor is converted into a translational movement, preferably by means of a transmission in the manner of a cam mechanism, with which the welding element is moved up and down.
  • the servomotor sweeps during the contact time of the welding element with the film at an angle of 120 °, in particular about 90 °, resulting in a prolonged welding time.
  • the plastic films can be welded in two stages, wherein at least one stage is operated by a method in which the servo motor is reversibly operated with alternating direction of rotation.
  • the movement from the transmission to the welding element can be damped by means of at least one air cylinder, resulting in a longer welding time.
  • the contact time of the welding element with the plastic films can be adjusted by means of the variable damping of the air cylinder.
  • the welding pressure of the welding element can be changed to the plastic films.
  • the contact time of the welding element can be adjusted with the plastic films.
  • the contact time can be doubled or tripled and the ability to drive at constant times, procedural advantages.
  • the procedures are particularly advantageous when the plastic films are welded together in two stages by pre-welding and final welding. At least the pre-welding is operated with the method according to the invention in order to achieve the longest possible welding time.
  • Fig. 2 shows the sequence of movement of the servomotor
  • Fig. 3 shows the velocity profile of the servomotor.
  • Fig. 1 the basic structure of a welding device of a bag making machine with at least one welding element, in the example, two welding elements, namely a welding bar 1 and a lower crossbar 2, is shown.
  • the welding bar 1 and the lower crossbar 2 have a working length of up to one meter.
  • the lower crossbar 2 is used in the example as a sweat pad for the welding bar.
  • the device consists of a servo motor 4, which is connected by means of a traction mechanism, in the example by means of a toothed belt 8, with a transmission, in the example of a cam gear 6, in the example.
  • the cam mechanism 6 contains a cylindrical drive train on which at least one eccentric disc, in the example three eccentric discs 14a, 14b, 14c, is flanged, and a drive train, in the example in the form of three hollow cylindrical raceways 13a, 13b, 13c.
  • the races 13a, 13b, 13c are larger in the inner diameter than the maximum outer diameter of the eccentric discs 14a, 14b, 14c, so that in each case an eccentric disc 14a, 14b, 14c in each case a race 13a, 13b, 13c can rotate.
  • the race 13a, 13b, 13c an outer ring and the eccentric disc 14a, 14b, 14c an inner ring.
  • the races 13a, 13b, 13c and the eccentric discs 14a, 14b, 14c are mounted on rolling elements.
  • the drive train is additionally mounted on the edge in the machine frame and mounted centrally by means of a bearing device.
  • the three races 13a, 13b, 13c are connected to at least one air cylinder, in the example each with an air cylinder 5a, 5b, 5c.
  • the three air cylinders 5a, 5b, 5c are connected on the other side of the air cylinder with a spar 7, the expansion of the welding beam 1 by the necessary heating of the welding beam 1 during welding ßes by means of disc springs, in the example two disc springs 10a, 10b, and lag screws , in the example, two lag screws 12a, 12b, receives or compensates.
  • the welding bar 1 is connected by means of spacer angle, in the example six distance angles 9a, 9b, 9c, 9d, 9e, 9f, with the spar 7.
  • the spar 7 is guided translationally in the machine frame by means of a sliding guide.
  • the rotational movement of the servomotor 4 is convertible by means of the cam mechanism 6 in a translational movement, with the welding bar 1 up and down is movable.
  • Teflon film in the example two layers of teflon film, and plastic film 3, in the example two layers of plastic film 3, is passed for welding between the welding bar 1 and the lower crossbar 2.
  • a layer of Teflon film and between the backsheet plastic film 3 and the lower cross beam 2 passes between the upper layer plastic film 3 and the welding bars 1 a sheet Teflon sheet therethrough to avoid the welding beam 1 bonding by welding of plastic films 3 '.
  • plastic film 3 and Teflon film is cyclically passed between the welding bar 1 and the lower crossbar 2 in the device controlled by a certain format. During the welding process, the teflon sheets and the plastic sheets 3 stand still in the apparatus.
  • the servomotor 4 is reversible operable with alternating direction of rotation. By controlling the servomotor 4, the start and stop position, the rotational speed, the swept angle range value during contact, and the contact time are adjustable. As shown in Fig. 2, in the exemplary embodiment, the rotational movement of the servomotor 4 is limited to 180 ° by the controller.
  • the starting position of the servomotor 4 is in the example at 270 °.
  • the servomotor 4 rotates from 270 ° to 90 ° clockwise. The range between 270 ° and 90 ° is divided into three areas: an entry angle, a contact angle and an exit angle.
  • the time used for the retracting, contacting and extending angles is variably adjustable by the control of the servomotor 4 by adjusting the rotational speed of the servomotor 4 for the respective welding time required.
  • the contact time is shortened because the contact angle is traversed faster. The reverse applies to a falling speed of the servomotor 4 in the contact angle.
  • the duration of driving through the retracting and extending angles to the rotational speed of the servomotor 4 is directly coupled.
  • the servo motor traverses the entire angular range from 270 ° to 90 ° in a defined time, in the example a constant time of 300 ms.
  • First will the entrance angle of 45 ° in a defined time, in the example constant time of 50 ms, passed through.
  • the entry angle ends at 315 °.
  • the contact angle closes and extends from 315 ° to 45 °. This results in a contact angle of 90 °.
  • the angle 0 ° is referred to as bottom dead center when passing through the contact angle.
  • the contact angle is also passed through in a defined time, in the example a constant time of 200 ms.
  • the angular range of 45 ° to 90 ° is referred to as the exit angle and is also in a defined time, in the example constant time of 50 ms, passed.
  • the stop position of the servomotor is reached. In this position, the servomotor 4 waits for the next start command, after which the movement is repeated in the opposite direction of rotation.
  • the rotational speed of the servomotor 4 and thus the rotational speed of the servomotor 4 is highest.
  • the rotational speed of the servomotor 4 is increased respectively in the entry angle or reduced in the exit angle.
  • plastic films 3 by means of a movable up and down, across the working width extending welding beam 1, which is connected to a servo motor 4 as a lifting drive, the servo motor 4 is reversibly operable with changing sense of rotation, and a lower crossbar 2 by transverse welding in only one step, the final welding, welded.
  • the welding bar 1 is heated to the temperature required for welding.
  • the lower crossbar 2 is heated to the temperature required for welding.
  • the rotational movement of the servomotor 4 is coupled via the toothed belt 8 with the drive train of the cam mechanism 6 via a transmission, in the example by means of two non-coaxial shafts with different overall dimensions.
  • the rotational movement of the servomotor 4 is converted by means of the cam gear 6 into a stroke movement of the welding bar 1.
  • the welding bar 1 lowers in the direction of the lower crossbar 2 from.
  • the necessary entry angle of the servo motor 4 which is in the example due to the distance from the welding bar 1 to the welding position 45 °.
  • the servo motor 4 is accelerated to a constant speed.
  • the servomotor 4 passes through the contact angle.
  • the damping of the respective air cylinders 5a, 5b, 5c is adjusted by increasing and decreasing the amount of air in the respective air cylinders 5a, 5b, 5c.
  • the contact time of the welding bar 1 with the plastic foils 3 surrounded by two Teflon foils and supported by the lower transverse bar 2 is adjustable by means of the cam gear 6.
  • the welding pressure of the welding bar 1 on the plastic foils 3 surrounded by two Teflon foils and supported by the lower crossbeam 2 is variable by means of the working pressure of the three air cylinders 5a, 5b, 5c.
  • the working pressure of the three air cylinders 5a, 5b, 5c is set to a constant value by means of a pressure gauge.
  • the air cylinder 5a, 5b, 5c relieved again.
  • the air cylinders 5a, 5b, 5c are again completely unloaded, i. the three air cylinders 5a, 5b, 5c are no longer damped, and the welding bar 1 stands out from the teflon film, the welded plastic films 3 and the lower crossbar 2 until the stop position of the servomotor 4 is reached.
  • the rotational speed of the servomotor 4 is decelerated to a standstill, which means that the welding bar 1 no longer moves at standstill of the servomotor 4 with a lifting movement and also stands still.
  • the plastic films 3 and the Teflon films are passed through the welding bar 1 and the lower crossbar 2 after reaching the extension angle of the servomotor 4 by a certain format again.
  • the servomotor 4 changes its direction of rotation and the welding of the plastic films 3 can start again.

Abstract

In order to weld plastic films, at least two plastic films (3) that are placed on top of each other are heated by at least one welding element (welding bar (1)) which is moved up and down by a servo motor (4). According to the invention, the aim is achieved by reversibly operating the servo motor (4) in alternating directions of revolution.

Description

B E S C H R E I B U N G DESCRIPTION
Verfahren und Vorrichtung zum Verschweißen von KunststofffolienMethod and device for welding plastic films
Die Erfindung betrifft ein Verfahren zum Verschweißen von Kunststofffolien, bei dem zumindest zwei Kunststofffolien übereinanderliegend von mindestens einem Schweißelement erhitzt werden, das von einem Servomotor angetrieben auf- und abbewegt wird und eine Vorrichtung zum Verschweißen von Kunststofffolien zur Herstellung von Beuteln, Taschen oder dergleichen.The invention relates to a method for welding plastic films, in which at least two plastic films are heated one above the other by at least one welding element, which is driven by a servomotor up and down and a device for welding plastic films for the production of bags, bags or the like.
Bei der Herstellung von Beuteln, Taschen oder dergleichen aus thermoplastischen Kunststofffolien werden bekannterweise die zu verschweißenden Folien übereinanderliegend zwischen aufheizbaren Schweißelementen hindurchgeführt und durch Erhitzen miteinander verbunden. Zur Herstellung von beispielsweise quer zur Laufrichtung der Kunststofffolien verlaufenden Schweißnähten durch Querschweißen werden die Folien taktweise vorgeschoben und von mindestens einem auf- und abbewegbaren balkenförmigen Schweißelement im Stillstand für eine bestimmte Zeit erhitzt.In the production of bags, bags or the like from thermoplastic films are known to be passed over the films to be welded superimposed between heatable welding elements and joined together by heating. To produce, for example transverse to the direction of the plastic films extending welds by transverse welding, the films are advanced in cycles and heated by at least one movable up and down bar-shaped welding element at a standstill for a certain time.
Aus der DE 102 34 509 A1 ist es bekannt, Schweißbalken mittels Servoantrieben auf- und abzubewegen. Die Servomotoren sind mit den Schweißbalken über einen Kurbeltrieb verbunden, um die Kreisbewegung des Motors in eine im Wesentlichen lineare Auf- und Abbewegung des Schweißbalkens umzuwandeln.From DE 102 34 509 A1 it is known to move welding bars up and down by means of servo drives. The servomotors are connected to the welding bars via a crank drive to convert the circular motion of the motor into a substantially linear up and down movement of the welding bar.
Bei den bekannten Anwendungen wird der einen Schweißbalken antreibende Servomotor immer in einem Bewegungssinn mit unterschiedlichen Drehzahlen betrieben, wobei nur in einem begrenzten Kreisabschnitt die gewünschte Funktion, nämlich die Auf- und Abbewegung des Schweißbalkens realisiert ist. In der Regel beträgt der nutzbare Weg des Servomotors im Verhältnis zu seinem Gesamtweg nur ein Viertel oder sogar weniger. Daraus resultiert eine entsprechend geringe Kontaktzeit des Schweißbalkens mit der Folie und damit eine entsprechend geringe Aufheizzeit während des Stillstands zwischen zwei Vorschubtakten.In the known applications of a welding bar driving servo motor is always operated in a sense of movement with different speeds, only in a limited circle section the desired function, namely the up and down movement of the welding bar is realized. In general, the usable travel of the servomotor is only a quarter or even less relative to its total travel. This results in a correspondingly low contact time of the welding bar with the film and thus a correspondingly short heating time during standstill between two feed strokes.
Für eine hohe Qualität der Schweißnaht, insbesondere für deren Reißfestigkeit, ist man bestrebt, möglichst lange Aufheizzeiten beim Verschweißen zu erreichen. Besonders beim Verschweißen in zwei Stufen, d.h. durch Vor- und anschließendes Endschweißen, ist es vorteilhaft, beim Vorschweißen möglichst lange zu erhitzen, bevor nach einem Vorschub in einer nachfolgenden Station die Endschweißung durchgeführt wird.For a high quality of the weld, especially for their tensile strength, it is endeavored to achieve the longest possible heating times during welding. Especially when welding in two stages, i. by pre-and then final welding, it is advantageous to heat as long as possible during pre-welding before after a feed in a subsequent station, the final weld is performed.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren bereitzustellen, mit dem sich Schweißnähte mit verbesserter Qualität mit verringertem maschinellen Aufwand herstellen lassen. Eine weitere Aufgabe liegt darin, eine Vorrichtung zur Durchführung eines erfindungsgemäßen Verfahrens durchzuführen.The invention is therefore based on the object to provide a method with which welds can be produced with improved quality with reduced mechanical complexity. Another object is to carry out an apparatus for carrying out a method according to the invention.
Die erste Aufgabe wird mit den Merkmalen des Patentanspruchs 1 gelöst. Patentanspruch 10 löst die zweite Aufgabe.The first object is achieved with the features of claim 1. Claim 10 solves the second task.
Die abhängigen Ansprüche enthalten bevorzugte, d.h. besonders vorteilhafte Ausgestaltungen der Erfindung.The dependent claims contain preferred, i. particularly advantageous embodiments of the invention.
Das Verfahren und die Vorrichtung der Erfindung sind für das Quer- und/oder Längsschweißen von Kunststofffolie, vorzugsweise für das Querschweißen, geeignet. Beim Verschweißen von Kunststofffolien werden die Kunststofffolien mittels Schweißelement miteinander verschweißt. Auch kann das Schweißelement zum Trennschweißen verwendet werden, bei dem während des Verschweißens die Folien zusätzlich durch den Schweißbalken getrennt werden. Bei der Erfindung wird die rotatorische Bewegung des Servomotors in eine translatorische Bewegung, vorzugsweise mittels eines Getriebes nach Art eines Kurvengetriebes, umgewandelt, mit der das Schweißelement auf- und abwärts bewegt wird.The method and apparatus of the invention are suitable for transverse and / or longitudinal welding of plastic film, preferably for transverse welding. When welding plastic films, the plastic films are welded together by means of welding element. Also, the welding element can be used for separating welding, during which the films are additionally separated by the welding bar during welding. In the invention, the rotational movement of the servomotor is converted into a translational movement, preferably by means of a transmission in the manner of a cam mechanism, with which the welding element is moved up and down.
Der Servomotor überstreicht während der Kontaktzeit des Schweißelements mit der Folie einen Winkel von maximal 120 °, insbesondere ca. 90 °, wodurch sich eine verlängerte Schweißzeit ergibt.The servomotor sweeps during the contact time of the welding element with the film at an angle of 120 °, in particular about 90 °, resulting in a prolonged welding time.
Mit Hilfe der Erfindung können die Kunststofffolien in zwei Stufen verschweißt werden, wobei zumindest eine Stufe mit einem Verfahren betrieben wird, bei dem der Servomotor reversibel mit wechselndem Umlaufsinn betrieben wird.With the help of the invention, the plastic films can be welded in two stages, wherein at least one stage is operated by a method in which the servo motor is reversibly operated with alternating direction of rotation.
Die Bewegung von dem Getriebe auf das Schweißelement kann mittels mindestens eines Luftzylinders gedämpft werden, wodurch sich eine längere Schweißzeit ergibt.The movement from the transmission to the welding element can be damped by means of at least one air cylinder, resulting in a longer welding time.
Die Kontaktzeit des Schweißelementes mit den Kunststofffolien kann mittels der veränderbaren Dämpfung des Luftzylinders eingestellt werden.The contact time of the welding element with the plastic films can be adjusted by means of the variable damping of the air cylinder.
Mittels des Arbeitsdrucks des Luftzylinders kann der Schweißdruck des Schweißelementes auf die Kunststofffolien verändert werden.By means of the working pressure of the air cylinder, the welding pressure of the welding element can be changed to the plastic films.
Mittels des Getriebes, das mindestens eine exzentrische Scheibe enthält, kann die Kontaktzeit des Schweißelements mit den Kunststofffolien eingestellt werden. Die genannten Verfahrensweisen haben mehrere Vorteile:By means of the transmission, which contains at least one eccentric disc, the contact time of the welding element can be adjusted with the plastic films. The procedures mentioned have several advantages:
Es sind kleinere Motor-Reglerkombinationen möglich. Dies führt zu Kosteneinsparungen. Die Bewegung mit wechselndem Umlaufsinn führt zu einer geringen Schwungmasse. Daher können mechanische Bauteile zur Versteifung entfallen.Smaller motor-controller combinations are possible. This leads to cost savings. The movement with alternating direction of rotation leads to a small flywheel mass. Therefore, mechanical components can be omitted for stiffening.
Zu bekannten Systemen lässt sich die Kontaktzeit verdoppeln bis verdreifachen und durch die Möglichkeit, mit konstanten Zeiten zu fahren, ergeben sich verfahrenstechnische Vorteile.To known systems, the contact time can be doubled or tripled and the ability to drive at constant times, procedural advantages.
Die Verfahrensweisen sind besonders vorteilhaft, wenn die Kunststofffolien in zwei Stufen durch Vorschweißen und Endschweißen miteinander verschweißt werden. Dabei wird zumindest das Vorschweißen mit dem Verfahren nach der Erfindung betrieben, um eine möglichst lange Schweißzeit zu erreichen.The procedures are particularly advantageous when the plastic films are welded together in two stages by pre-welding and final welding. At least the pre-welding is operated with the method according to the invention in order to achieve the longest possible welding time.
Nachfolgend wird die Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels näher erläutert. Dabei zeigen:The invention will be explained in more detail with reference to an embodiment shown in simplified form. Showing:
Fig. 1 den prinzipiellen Aufbau einer Vorrichtung nach der Erfindung,1 shows the basic structure of a device according to the invention,
Fig. 2 den Bewegungsablauf des Servomotors undFig. 2 shows the sequence of movement of the servomotor and
Fig. 3 das Geschwindigkeitsprofil des Servomotors.Fig. 3 shows the velocity profile of the servomotor.
In Fig. 1 ist der prinzipielle Aufbau einer Schweißvorrichtung einer Beutelherstellungsmaschine mit mindestens einem Schweißelement, im Beispiel zwei Schweißelementen, nämlich einem Schweißbalken 1 und einem unteren Querbalken 2, dargestellt. Der Schweißbalken 1 und der untere Querbalken 2 weisen dabei eine Arbeitslänge von bis zu einem Meter auf. Der untere Querbalken 2 dient im Beispiel als Schweißauflage für den Schweißbalken 1. Die Vorrichtung besteht aus einem Servomotor 4, der mittels eines Zugmittelgetriebes, im Beispiel mittels eines Zahnriemens 8, mit einem Getriebe, im Beispiel nach Art eines Kurvengetriebes 6, verbunden ist. Das Kurvengetriebe 6 enthält einen zylinderförmigen Antriebstrang, auf den zumindest eine exzentrische Scheibe, im Beispiel drei exzentrische Scheiben 14a, 14b, 14c, aufgeflanscht ist, und einen Abtriebstrang, im Beispiel in Form von drei hohl- zylinderförmigen Laufringen 13a, 13b, 13c. Die Laufringe 13a, 13b, 13c sind dabei im Innendurchmesser größer als der maximale Außendurchmesser der exzentrischen Scheiben 14a, 14b, 14c, so dass jeweils eine exzentrische Scheibe 14a, 14b, 14c in jeweils einem Laufring 13a, 13b, 13c rotieren kann. Dabei stellt der Laufring 13a, 13b, 13c einen Außenring und die exzentrische Scheibe 14a, 14b, 14c einen Innenring dar. Die Laufringe 13a, 13b, 13c und die exzentrische Scheiben 14a, 14b, 14c sind über Wälzkörper gelagert. Der Antriebsstrang ist zusätzlich am Rand im Maschinengestell gelagert und mittig mittels einer Lagervorrichtung gelagert.In Fig. 1, the basic structure of a welding device of a bag making machine with at least one welding element, in the example, two welding elements, namely a welding bar 1 and a lower crossbar 2, is shown. The welding bar 1 and the lower crossbar 2 have a working length of up to one meter. The lower crossbar 2 is used in the example as a sweat pad for the welding bar. 1 The device consists of a servo motor 4, which is connected by means of a traction mechanism, in the example by means of a toothed belt 8, with a transmission, in the example of a cam gear 6, in the example. The cam mechanism 6 contains a cylindrical drive train on which at least one eccentric disc, in the example three eccentric discs 14a, 14b, 14c, is flanged, and a drive train, in the example in the form of three hollow cylindrical raceways 13a, 13b, 13c. The races 13a, 13b, 13c are larger in the inner diameter than the maximum outer diameter of the eccentric discs 14a, 14b, 14c, so that in each case an eccentric disc 14a, 14b, 14c in each case a race 13a, 13b, 13c can rotate. In this case, the race 13a, 13b, 13c an outer ring and the eccentric disc 14a, 14b, 14c an inner ring. The races 13a, 13b, 13c and the eccentric discs 14a, 14b, 14c are mounted on rolling elements. The drive train is additionally mounted on the edge in the machine frame and mounted centrally by means of a bearing device.
Die drei Laufringe 13a, 13b, 13c sind mit mindestens einem Luftzylinder, im Beispiel mit jeweils einem Luftzylinder 5a, 5b, 5c, verbunden.The three races 13a, 13b, 13c are connected to at least one air cylinder, in the example each with an air cylinder 5a, 5b, 5c.
Die drei Luftzylinder 5a, 5b, 5c sind auf der anderen Luftzylinderseite mit einem Holm 7 verbunden, der die Ausdehnung des Schweißbalkens 1 durch die notwendige Erwärmung des Schweißbalkens 1 während des Verschwei- ßens mittels Tellerfedern, im Beispiel zwei Tellerfedem 10a, 10b, und Zugschrauben, im Beispiel zwei Zugschrauben 12a, 12b, aufnimmt beziehungsweise ausgleicht.The three air cylinders 5a, 5b, 5c are connected on the other side of the air cylinder with a spar 7, the expansion of the welding beam 1 by the necessary heating of the welding beam 1 during welding ßes by means of disc springs, in the example two disc springs 10a, 10b, and lag screws , in the example, two lag screws 12a, 12b, receives or compensates.
Der Schweißbalken 1 ist mittels Distanzwinkel, im Beispiel sechs Distanzwinkeln 9a, 9b, 9c, 9d, 9e, 9f, mit dem Holm 7 verbunden. Der Holm 7 wird mittels einer Verschiebeführung translatorisch im Maschinengestell geführt. Die rotatorische Bewegung des Servomotors 4 ist mittels des Kurvengetriebes 6 in eine translatorische Bewegung umwandelbar, mit der der Schweißbalken 1 auf- und abwärts bewegbar ist. Durch die Verschiebeführung wird der Schweißbalken 1 auch translatorisch geführt. Zwischen dem Schweißbalken 1 und dem unteren Querbalken 2 wird Teflonfolie, im Beispiel zwei Lagen Teflonfolie, und Kunststofffolie 3, im Beispiel zwei Lagen Kunststofffolie 3, zum Verschweißen hindurchgeführt. Dabei läuft zwischen der oberen Lage Kunststofffolie 3 und dem Schweißbalken 1 eine Lage Teflonfolie und zwischen der unteren Lage Kunststofffolie 3 und dem unteren Querbalken 2 eine Lage Teflonfolie hindurch, um am Schweißbalken 1 Verklebungen durch das Verschweißen von Kunststofffolien 3 zu 'vermeiden. Zum Verschweißen wird Kunststofffolie 3 und Teflonfolie taktweise zwischen dem Schweißbalken 1 und dem unteren Querbalken 2 in der Vorrichtung um ein bestimmtes Format gesteuert hindurchgeführt. Während des Schweißvorgangs stehen die Teflonfolien und die Kunststofffolien 3 in der Vorrichtung still.The welding bar 1 is connected by means of spacer angle, in the example six distance angles 9a, 9b, 9c, 9d, 9e, 9f, with the spar 7. The spar 7 is guided translationally in the machine frame by means of a sliding guide. The rotational movement of the servomotor 4 is convertible by means of the cam mechanism 6 in a translational movement, with the welding bar 1 up and down is movable. By the sliding guide the welding bar 1 is also guided translationally. Teflon film, in the example two layers of teflon film, and plastic film 3, in the example two layers of plastic film 3, is passed for welding between the welding bar 1 and the lower crossbar 2. In this case, a layer of Teflon film and between the backsheet plastic film 3 and the lower cross beam 2 passes between the upper layer plastic film 3 and the welding bars 1 a sheet Teflon sheet therethrough to avoid the welding beam 1 bonding by welding of plastic films 3 '. For welding plastic film 3 and Teflon film is cyclically passed between the welding bar 1 and the lower crossbar 2 in the device controlled by a certain format. During the welding process, the teflon sheets and the plastic sheets 3 stand still in the apparatus.
Der Servomotor 4 ist reversibel mit wechselndem Umlaufsinn betreibbar. Durch eine Steuerung des Servomotors 4 sind die Start- und Stoppposition, die Drehzahl, der überstrichene Winkelbereichswert während des Kontakts und die Kontaktzeit einstellbar. Wie in Fig. 2 dargestellt ist im Ausführungsbeispiel die Drehbewegung des Servomotors 4 auf 180° durch die Steuerung begrenzt. Die Startposition des Servomotors 4 liegt im Beispiel bei 270°. Zum Verschweißen dreht der Servomotor 4 von 270° auf 90° im Uhrzeigersinn. Der Bereich zwischen 270° und 90° teilt sich in drei Bereiche auf: einem Einfahrwinkel, einem Kontaktwinkel und einem Ausfahrwinkel. Die Zeit, die für den Einfahr-, Kontakt- und Ausfahrwinkel verwendet wird, ist variabel mittels der Steuerung des Servomotors 4 einstellbar, indem die Drehzahl des Servomotors 4 für die jeweilige notwendige Schweißzeit eingestellt wird. Mit steigender Drehzahl des Servomotors 4 im Kontaktwinkel verkürzt sich die Kontaktzeit, da der Kontaktwinkel schneller durchfahren wird. Umgekehrtes gilt für eine sinkende Drehzahl des Servomotors 4 im Kontaktwinkel.The servomotor 4 is reversible operable with alternating direction of rotation. By controlling the servomotor 4, the start and stop position, the rotational speed, the swept angle range value during contact, and the contact time are adjustable. As shown in Fig. 2, in the exemplary embodiment, the rotational movement of the servomotor 4 is limited to 180 ° by the controller. The starting position of the servomotor 4 is in the example at 270 °. For welding, the servomotor 4 rotates from 270 ° to 90 ° clockwise. The range between 270 ° and 90 ° is divided into three areas: an entry angle, a contact angle and an exit angle. The time used for the retracting, contacting and extending angles is variably adjustable by the control of the servomotor 4 by adjusting the rotational speed of the servomotor 4 for the respective welding time required. With increasing speed of the servomotor 4 in the contact angle, the contact time is shortened because the contact angle is traversed faster. The reverse applies to a falling speed of the servomotor 4 in the contact angle.
Ebenso ist die Dauer des Durchfahrens von Einfahr- und Ausfahrwinkel an die Drehzahl des Servomotors 4 direkt gekoppelt. Wie in Fig. 3 dargestellt durchläuft, der Servomotor den gesamten Winkelbereich von 270° auf 90° in einer definierten Zeit, im Beispiel konstanten Zeit von 300 ms. Zuerst wird der Einfahrwinkel von 45° in einer definierten Zeit, im Beispiel konstanten Zeit von 50 ms, durchfahren. Wie in Fig. 2 dargestellt endet der Einfahrwinkel bei 315°.Likewise, the duration of driving through the retracting and extending angles to the rotational speed of the servomotor 4 is directly coupled. As shown in FIG. 3, the servo motor traverses the entire angular range from 270 ° to 90 ° in a defined time, in the example a constant time of 300 ms. First will the entrance angle of 45 ° in a defined time, in the example constant time of 50 ms, passed through. As shown in Fig. 2, the entry angle ends at 315 °.
An den Einfahrwinkel schließt der Kontaktwinkel an und erstreckt sich von 315 ° auf 45°. Somit ergibt sich ein Kontaktwinkel von 90°. Der Winkel 0° wird beim Durchfahren des Kontaktwinkels als unterer Totpunkt bezeichnet. Wie Fig. 3 zeigt wird der Kontaktwinkel auch in einer definierten Zeit, im Beispiel konstanten Zeit von 200 ms, durchfahren.At the entry angle, the contact angle closes and extends from 315 ° to 45 °. This results in a contact angle of 90 °. The angle 0 ° is referred to as bottom dead center when passing through the contact angle. As shown in FIG. 3, the contact angle is also passed through in a defined time, in the example a constant time of 200 ms.
Wie in Fig. 2 beziehungsweise Fig. 3 dargestellt wird der Winkelbereich von 45° bis 90° als Ausfahrwinkel bezeichnet und wird auch in einer definierten Zeit, im Beispiel konstanten Zeit von 50 ms, durchfahren.As shown in Fig. 2 and Fig. 3, the angular range of 45 ° to 90 ° is referred to as the exit angle and is also in a defined time, in the example constant time of 50 ms, passed.
Bei 90° ist die Stoppposition des Servomotors erreicht. In dieser Position wartet der Servomotor 4 auf den nächsten Startbefehl, wonach die Bewegung mit entgegengesetzten Umlaufsinn wiederholt wird.At 90 °, the stop position of the servomotor is reached. In this position, the servomotor 4 waits for the next start command, after which the movement is repeated in the opposite direction of rotation.
Beim Durchfahren des Kontaktwinkels ist, wie in Fig. 3 dargestellt, die Drehgeschwindigkeit des Servomotors 4 und somit die Drehzahl des Servomotors 4 am höchsten. Beim Durchfahren des Einfahr- und Ausfahrwinkels wird die Drehzahl des Servomotors 4 jeweils im Einfahrwinkel erhöht bzw. im Ausfahrwinkel verringert.When passing through the contact angle, as shown in Fig. 3, the rotational speed of the servomotor 4 and thus the rotational speed of the servomotor 4 is highest. When driving through the retraction and extension angle, the rotational speed of the servomotor 4 is increased respectively in the entry angle or reduced in the exit angle.
Im Ausführungsbeispiel werden Kunststofffolien 3 mittels eines auf- und abbewegbaren, sich quer über die Arbeitsbreite erstreckenden Schweißbalkens 1 , der mit einem Servomotor 4 als Hubantrieb verbunden ist, wobei der Servomotor 4 reversibel mit wechselndem Umlaufsinn betreibbar ist, und eines unteren Querbalkens 2 durch Querschweißen in nur einer Stufe, dem Endschweißen, verschweißt. Zum Verschweißen ist der Schweißbalken 1 auf die zum Verschweißen erforderliche Temperatur aufgeheizt. Auch der untere Querbalken 2 ist auf die zum Verschweißen erforderliche Temperatur aufgeheizt. Die Drehbewegung des Servomotors 4 ist über den Zahnriemen 8 mit dem Antriebstrang des Kurvengetriebes 6 über eine Übersetzung, im Beispiel mittels zweier nicht koaxialer Wellen mit unterschiedlichem Bauumfang, gekoppelt. Die Drehbewegung des Servomotors 4 wird mittels des Kurvengetriebes 6 in eine Hubbewegung des Schweißbalkens 1 umgewandelt. Im Einfahrwinkel des Servomotors 4 senkt sich der Schweißbalken 1 in Richtung des unteren Querbalkens 2 ab. Durch den Abstand des Schweißbalken 1 von der Position zum Verschweißen ergibt sich der notwendige Einfahrwinkel des Servomotors 4, der im Beispiel aufgrund des Abstandes von dem Schweißbalken 1 zu der Schweißposition 45° ist. Im Einfahrwinkel wird der Servomotor 4 auf eine konstante Drehzahl beschleunigt.In the exemplary embodiment, plastic films 3 by means of a movable up and down, across the working width extending welding beam 1, which is connected to a servo motor 4 as a lifting drive, the servo motor 4 is reversibly operable with changing sense of rotation, and a lower crossbar 2 by transverse welding in only one step, the final welding, welded. For welding, the welding bar 1 is heated to the temperature required for welding. Also, the lower crossbar 2 is heated to the temperature required for welding. The rotational movement of the servomotor 4 is coupled via the toothed belt 8 with the drive train of the cam mechanism 6 via a transmission, in the example by means of two non-coaxial shafts with different overall dimensions. The rotational movement of the servomotor 4 is converted by means of the cam gear 6 into a stroke movement of the welding bar 1. In the entry angle of the servomotor 4, the welding bar 1 lowers in the direction of the lower crossbar 2 from. By the distance of the welding bar 1 from the position for welding results in the necessary entry angle of the servo motor 4, which is in the example due to the distance from the welding bar 1 to the welding position 45 °. In the entry angle, the servo motor 4 is accelerated to a constant speed.
Wenn der Schweißbalken 1 die Teflonfolien, die Kunststofffolien 3 und den unteren Querbalken 2 berührt, d.h. die Position zum Verschweißen erreicht ist, durchfährt der Servomotors 4 den Kontaktwinkel.When the welding bar 1 contacts the teflon sheets, the plastic sheets 3 and the lower cross bar 2, i. the position for welding is reached, the servomotor 4 passes through the contact angle.
Durch die Dämpfung der Luftzylinder 5a, 5b, 5c wird die weitere translatorische Bewegung von dem Kurvengetriebe 6 auf den Schweißbalken 1 mittels der Dämpfung in den jeweiligen Luftzylindern 5a, 5b, 5c aufgenommen. Mittels der Luftzylinder 5a, 5b, 5c ist somit die Bewegung von dem Kurvengetriebe 6 auf das Schweißelement 1 dämpfbar. Die Kontaktzeit des Schweißbalkens 1 mit den von zwei Teflonfolien umgebenen und vom unteren Querbalken 2 abgestützten Kunststofffolien 3 ist somit mittels der veränderbaren Dämpfung der drei Luftzylinder 5a, 5b, 5c einstellbar. Die Dämpfung der jeweiligen Luftzylinder 5a, 5b, 5c wird durch Erhöhung und Verringerung der Luftmenge in den jeweiligen Luftzylindern 5a, 5b, 5c eingestellt. Die Kontaktzeit des Schweißbalkens 1 mit den von zwei Teflonfolien umgebenen und vom unteren Querbalken 2 abgestützten Kunststofffolien 3 ist mittels des Kurvengetriebes 6 einstellbar. Der Schweißdruck des Schweißbalkens 1 auf die von zwei Teflonfolien umgebenen und vom unteren Querbalken 2 abgestützten Kunststofffolien 3 ist mittels des Arbeitsdrucks der drei Luftzylinder 5a, 5b, 5c veränderbar. Im Beispiel ist der Arbeitsdruck der drei Luftzylinder 5a, 5b, 5c mittels eines Manometers auf einen konstanten Wert eingestellt.By the damping of the air cylinder 5a, 5b, 5c, the further translational movement is absorbed by the cam gear 6 on the welding bar 1 by means of the damping in the respective air cylinders 5a, 5b, 5c. By means of the air cylinder 5a, 5b, 5c, the movement of the cam mechanism 6 on the welding element 1 is thus damped. The contact time of the welding bar 1 with the plastic foils 3 surrounded by two Teflon foils and supported by the lower crossbeam 2 is thus adjustable by means of the variable damping of the three air cylinders 5a, 5b, 5c. The damping of the respective air cylinders 5a, 5b, 5c is adjusted by increasing and decreasing the amount of air in the respective air cylinders 5a, 5b, 5c. The contact time of the welding bar 1 with the plastic foils 3 surrounded by two Teflon foils and supported by the lower transverse bar 2 is adjustable by means of the cam gear 6. The welding pressure of the welding bar 1 on the plastic foils 3 surrounded by two Teflon foils and supported by the lower crossbeam 2 is variable by means of the working pressure of the three air cylinders 5a, 5b, 5c. In the example, the working pressure of the three air cylinders 5a, 5b, 5c is set to a constant value by means of a pressure gauge.
Nach Durchschreiten des unteren Totpunkts im Kontaktwinkel bei 0° werden die Luftzylinder 5a, 5b, 5c wieder entlastet. Im Ausfahrwinkel sind die Luftzylinder 5a, 5b, 5c wieder vollkommen entlasted, d.h. die drei Luftzylinder 5a, 5b, 5c dämpfen nicht mehr, und der Schweißbalken 1 hebt sich von der Teflonfolie, den verschweißten Kunststofffolien 3 und dem unteren Querbalken 2 ab, bis die Stoppposition des Servomotors 4 erreicht wird. Im Ausfahrwinkel wird die Drehgeschwindigkeit des Servomotors 4 bis zum Stillstand verzögert, was dazu führt, dass der Schweißbalken 1 sich bei Stillstand des Servomotors 4 nicht mehr mit einer Hubbewegung bewegt und auch still steht.After passing through the bottom dead center in the contact angle at 0 °, the air cylinder 5a, 5b, 5c relieved again. At the exit angle, the air cylinders 5a, 5b, 5c are again completely unloaded, i. the three air cylinders 5a, 5b, 5c are no longer damped, and the welding bar 1 stands out from the teflon film, the welded plastic films 3 and the lower crossbar 2 until the stop position of the servomotor 4 is reached. In the extension angle, the rotational speed of the servomotor 4 is decelerated to a standstill, which means that the welding bar 1 no longer moves at standstill of the servomotor 4 with a lifting movement and also stands still.
Die Kunststofffolien 3 und die Teflonfolien werden nach Erreichen des Ausfahrwinkels des Servomotors 4 um ein bestimmtes Format wieder durch den Schweißbalken 1 und den unteren Querbalken 2 hindurchgeführt. Für eine weitere Verschweißung wechselt der Servomotor 4 seine Umlaufrichtung und die Verschweißung der Kunststofffolien 3 kann erneut beginnen. The plastic films 3 and the Teflon films are passed through the welding bar 1 and the lower crossbar 2 after reaching the extension angle of the servomotor 4 by a certain format again. For a further welding, the servomotor 4 changes its direction of rotation and the welding of the plastic films 3 can start again.

Claims

P A T E N T A N S P R Ü C H E PATENT APPLICATIONS
1.1.
Verfahren zum Verschweißen von Kunststofffolien, bei dem zumindest zwei Kunststofffolien (3) übereinanderliegend von mindestens einem Schweißelement (Schweißbalken (1)) erhitzt werden, das von einem Servomotor (4) angetrieben auf- und abbewegt wird, dadurch gekennzeichnet, dass der Servomotor (4) reversibel mit wechselndem Umlaufsinn betrieben wird.Method for welding plastic films, in which at least two plastic films (3) are heated one above the other by at least one welding element (welding bar (1)) which is driven up and down driven by a servomotor (4), characterized in that the servomotor (4 ) is reversibly operated with alternating direction of rotation.
2.Second
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Schweißelement (Schweißbalken (1)) zum Trennschweißen verwendet wird.A method according to claim 1, characterized in that the welding element (welding bar (1)) is used for separating welding.
3.Third
Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die rotatorische Bewegung des Servomotors (4) mittels eines Getriebes, vorzugsweise nach Art eines Kurvengetriebes (6), in eine translatorische Bewegung umgewandelt wird, mit der das Schweißelement (Schweißbalken (1)) auf- und abwärts bewegt wird.A method according to claim 1 or 2, characterized in that the rotational movement of the servomotor (4) by means of a transmission, preferably in the manner of a cam mechanism (6), is converted into a translational movement, with the welding element (welding bar (1)) on - and is moved down.
4.4th
Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Servomotor (4) während der Kontaktzeit des Schweißelements (Schweißbalken (1)) mit der Kunststofffolie (3) einen Winkel von maximal 120 °, insbesondere ca. 90 °, überstreicht. Method according to one of claims 1 to 3, characterized in that the servomotor (4) during the contact time of the welding element (welding bar (1)) with the plastic film (3) covers an angle of at most 120 °, in particular about 90 °.
5.5th
Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Kunststofffolien (3) in zwei Stufen verschweißt werden, wobei zumindest eine Stufe mit einem Verfahren nach Anspruch 1 betrieben wird.Method according to one of claims 1 to 4, characterized in that the plastic films (3) are welded in two stages, wherein at least one stage is operated by a method according to claim 1.
6.6th
Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass mittels mindestens eines Luftzylinders (5a, 5b, 5c) die Bewegung von dem Getriebe (Kurvengetriebe (6)) auf das Schweißelement (Schweißbalken (1)) gedämpft wird.Method according to one of claims 1 to 5, characterized in that by means of at least one air cylinder (5a, 5b, 5c), the movement of the transmission (cam mechanism (6)) on the welding element (welding bar (1)) is damped.
7.7th
Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass mittels der veränderbaren Dämpfung des Luftzylinders (5a, 5b, 5c) die Kontaktzeit des Schweißelementes (Schweißbalken (1)) mit den Kunststofffolien (3) eingestellt wird.Method according to one of claims 1 to 6, characterized in that by means of the variable damping of the air cylinder (5a, 5b, 5c), the contact time of the welding element (welding bar (1)) with the plastic films (3) is adjusted.
8.8th.
Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass mittels des Arbeitsdrucks des Luftzylinders (5a, 5b, 5c) der Schweißdruck des Schweißelementes (Schweißbalken (1)) auf die Kunststofffolien (3) verändert wird.Method according to one of claims 1 to 7, characterized in that by means of the working pressure of the air cylinder (5a, 5b, 5c), the welding pressure of the welding element (welding bar (1)) is changed to the plastic films (3).
9.9th
Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass mittels des Getriebes (Kurvengetriebe (6)), das mindestens eine exzentrische Scheibe (14a, 14b, 14c) enthält, die Kontaktzeit des Schweißelements (Schweißbalken (1)) mit den Kunststofffolien (3) eingestellt wird. Method according to one of claims 1 to 8, characterized in that by means of the transmission (cam mechanism (6)) which contains at least one eccentric disc (14a, 14b, 14c), the contact time of the welding element (welding bar (1)) with the plastic films (3) is set.
10.10th
Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 9, gekennzeichnet durch zumindest ein auf- und abbewegbares Schweißelement, insbesondere ein sich quer über die Arbeitsbreite erstreckender Schweißbalken (1), der mit einem Servomotor (4) als Hubantrieb verbunden ist, wobei der Servomotor (4) reversibel mit wechselndem Umlaufsinn betreibbar ist.Apparatus for carrying out the method according to one of claims 1 to 9, characterized by at least one up and down movable welding element, in particular a transversely across the working width extending welding bar (1) which is connected to a servo motor (4) as a lifting drive, wherein the Servomotor (4) is reversible with changing sense of circulation operable.
11.11th
Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass durch eine Steuerung für den Servomotor (4) die Start- und Stoppposition, die Drehzahl, der überstrichene Winkelbereichswert während des Kontakts und die Kontaktzeit einstellbar ist.Apparatus according to claim 10, characterized in that by a control for the servomotor (4) the start and stop position, the speed, the swept angle range value during the contact and the contact time is adjustable.
12.12th
Vorrichtung nach Anspruch 10 oder 11 , dadurch gekennzeichnet, dass die rotatorische Bewegung des Servomotors (4) mittels eines Getriebes, vorzugsweise nach Art eines Kurvengetriebes (6), in eine translatorische Bewegung umwandelbar ist, mit der das Schweißelement (Schweißbalken (1)) auf- und abwärts bewegbar ist.Apparatus according to claim 10 or 11, characterized in that the rotational movement of the servomotor (4) by means of a transmission, preferably in the manner of a cam mechanism (6), is convertible into a translational movement, with the welding element (welding bar (1)) on - And is movable downwards.
13.13th
Vorrichtung nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass mittels mindestens eines Luftzylinders (5a, 5b, 5c) die Bewegung von dem Getriebe (Kurvengetriebe (6)) auf das Schweißelement (Schweißbalken (1)) dämpfbar ist.Device according to one of claims 10 to 12, characterized in that by means of at least one air cylinder (5a, 5b, 5c), the movement of the transmission (cam mechanism (6)) on the welding element (welding bar (1)) can be damped.
14.14th
Vorrichtung nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass mittels der veränderbaren Dämpfung des Luftzylinders (5a, 5b, 5c) die Kontaktzeit des Schweißelementes (Schweißbalken (1)) mit den Kunststofffolien (3) einstellbar ist. Device according to one of claims 10 to 13, characterized in that by means of the variable damping of the air cylinder (5a, 5b, 5c), the contact time of the welding element (welding bar (1)) with the plastic films (3) is adjustable.
15.15th
Vorrichtung nach einem der Ansprüche 10 bis 14, dadurch gekennzeichnet, dass mittels des Arbeitsdrucks des Luftzylinders (5a, 5b, 5c) der Schweißdruck des Schweißelementes (Schweißbalken (1)) auf die Kunststofffolien (3) veränderbar ist.Device according to one of claims 10 to 14, characterized in that by means of the working pressure of the air cylinder (5a, 5b, 5c), the welding pressure of the welding element (welding bar (1)) on the plastic films (3) is variable.
16.16th
Vorrichtung nach einem der Ansprüche 10 bis 15, dadurch gekennzeichnet, dass das Getriebe (Kurvengetriebe (6)) mindestens eine exzentrische Scheibe (14a, 14b, 14c) enthält.Device according to one of claims 10 to 15, characterized in that the transmission (cam mechanism (6)) at least one eccentric disc (14a, 14b, 14c) contains.
17.17th
Vorrichtung nach einem der Ansprüche 10 bis 16, dadurch gekennzeichnet, dass mittels des Getriebes (Kurvengetriebe (6)) die Kontaktzeit des Schweißelements (Schweißbalken (1)) mit den Kunststofffolien (3) einstellbar ist. Device according to one of claims 10 to 16, characterized in that by means of the transmission (cam mechanism (6)), the contact time of the welding element (welding bar (1)) with the plastic films (3) is adjustable.
PCT/EP2009/008134 2009-02-10 2009-11-16 Method and apparatus for welding plastic films WO2010091708A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009008332.4 2009-02-10
DE102009008332 2009-02-10

Publications (1)

Publication Number Publication Date
WO2010091708A1 true WO2010091708A1 (en) 2010-08-19

Family

ID=41724349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/008134 WO2010091708A1 (en) 2009-02-10 2009-11-16 Method and apparatus for welding plastic films

Country Status (2)

Country Link
DE (1) DE102009053014A1 (en)
WO (1) WO2010091708A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018089504A1 (en) * 2016-11-08 2018-05-17 Ameriglobe, Llc Stitchless bulk bag with heat fused seams and method of production
CN108081666A (en) * 2017-12-14 2018-05-29 东北大学 A kind of shirt carton folding device and its method for folding
CN112478309A (en) * 2020-12-05 2021-03-12 山东鲁地源天然药物有限公司 Quick sealing device and method for realizing sealing by using same
US10974869B2 (en) 2013-06-05 2021-04-13 Ameriglobe, Llc Method of production of fabric bags or containers using heat fused seams

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011075424B4 (en) * 2011-05-06 2023-06-15 Syntegon Packaging Solutions B.V. Method for operating a transverse seam sealing device in a tubular bagging machine and transverse seam sealing device in a tubular bagging machine
CN112078902A (en) * 2020-09-27 2020-12-15 广州食未尽商贸有限公司 Packaging bag sealing machine with adjustable heating time
CN116902323B (en) * 2023-09-13 2024-03-12 广东环一智造科技有限公司 Back sealing device for strip-shaped packaging bag

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540802A (en) * 1991-10-09 1996-07-30 Totani Giken Kogyo Co., Ltd. Apparatus for heat sealing two superposed layers of plastic film
EP1655229A1 (en) * 2004-11-05 2006-05-10 Rennco, Inc. Sealing mechanism and method for packaging device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10234509A1 (en) 2002-07-30 2004-02-12 Lemo Maschinenbau Gmbh Transverse welding or welding and cutting machine for plastic films used in bag and sack production has a plastic band between two welding tools

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5540802A (en) * 1991-10-09 1996-07-30 Totani Giken Kogyo Co., Ltd. Apparatus for heat sealing two superposed layers of plastic film
EP1655229A1 (en) * 2004-11-05 2006-05-10 Rennco, Inc. Sealing mechanism and method for packaging device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10974869B2 (en) 2013-06-05 2021-04-13 Ameriglobe, Llc Method of production of fabric bags or containers using heat fused seams
US11279523B2 (en) 2013-06-05 2022-03-22 Ameriglobe, Llc Method of production of fabric bags or containers using heat fused seams
US11858691B2 (en) 2013-06-05 2024-01-02 Ameriglobe, Llc Method of production of fabric bags or containers using heat fused seams
WO2018089504A1 (en) * 2016-11-08 2018-05-17 Ameriglobe, Llc Stitchless bulk bag with heat fused seams and method of production
CN110191848A (en) * 2016-11-08 2019-08-30 环美有限公司 Needleless seam loose bags and its production method with heat fusion seam
US10618225B2 (en) 2016-11-08 2020-04-14 Ameriglobe, Llc Carrier plate for use in manufacturing stitchless bulk bags with heat fused seams
US11338527B2 (en) 2016-11-08 2022-05-24 Ameriglobe, Llc Heat seal bar assembly
CN108081666A (en) * 2017-12-14 2018-05-29 东北大学 A kind of shirt carton folding device and its method for folding
CN108081666B (en) * 2017-12-14 2019-04-05 东北大学 A kind of shirt carton folding device and its method for folding
CN112478309A (en) * 2020-12-05 2021-03-12 山东鲁地源天然药物有限公司 Quick sealing device and method for realizing sealing by using same
CN112478309B (en) * 2020-12-05 2022-04-22 山东鲁地源天然药物有限公司 Quick sealing device and method for realizing sealing by using same

Also Published As

Publication number Publication date
DE102009053014A1 (en) 2010-08-19

Similar Documents

Publication Publication Date Title
WO2010091708A1 (en) Method and apparatus for welding plastic films
EP3041747B1 (en) Horizontal transverse sealing station
EP1832408B1 (en) Thermoforming method and thermoforming machine with toggle mechanism
DE112013001648B4 (en) Press drive with multiple work areas
EP1642831B1 (en) Method and apparatus for moving sealing jaws
WO2011045303A2 (en) Powder press
WO2006045279A2 (en) Drive system for a forming press
DE102006052474A1 (en) Roller shaping machine for manufacturing or processing gear wheel, has direct drive for moving shaping drive transverse to shaping direction, and measuring system arranged at direct drive and monitoring movement of direct drive
DE102010047749B4 (en) Method for cutting block materials and cutting machine for cutting block materials
DE212016000100U1 (en) NC sheet metal bending machine with two rolls operated at different speeds and with variable curvature
DE102012102525B4 (en) Multi-mode press drive for a press and method of operating a press drive
EP1842659A2 (en) Press
DE102008028379B3 (en) Tension rolling device for circular saw blade, has generator formed by electric motor, where transmission force of motor acts on system and acts against operating pressure such that rolls are vertically engaged at distance together
DE102011075986A1 (en) Method for energy-efficient sealing of tubular bags
DE102013105609B4 (en) Device for introducing embossing into a moving product web and method for operating such a device
WO2014191284A1 (en) Press and method for operating the press
EP1981792B1 (en) Apparatus for treating a material web
EP4029991A1 (en) Tamper stroke adjustment
EP1471023B1 (en) Tearing device for webs of material
DE102011004203A1 (en) Device with a plurality of cold rolling plants
DE102006033604B4 (en) Capacitors discharge welding device
DE102009043729A1 (en) Method for moving a processing unit of a machine
EP3025803B1 (en) Drive device for a machine tool and machine tool with such a drive device
DE10234509A1 (en) Transverse welding or welding and cutting machine for plastic films used in bag and sack production has a plastic band between two welding tools
DE3001596C2 (en) Crank gear

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09765019

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 09765019

Country of ref document: EP

Kind code of ref document: A1