DE1479314A1 - Temperature control for a film sealing device - Google Patents

Temperature control for a film sealing device

Info

Publication number
DE1479314A1
DE1479314A1 DE19651479314 DE1479314A DE1479314A1 DE 1479314 A1 DE1479314 A1 DE 1479314A1 DE 19651479314 DE19651479314 DE 19651479314 DE 1479314 A DE1479314 A DE 1479314A DE 1479314 A1 DE1479314 A1 DE 1479314A1
Authority
DE
Germany
Prior art keywords
temperature
welding
timer
pulse
sealing device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19651479314
Other languages
German (de)
Inventor
Walter Klimt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SCHICKEDANZ KG G
Original Assignee
SCHICKEDANZ KG G
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 SCHICKEDANZ KG G filed Critical SCHICKEDANZ KG G
Publication of DE1479314A1 publication Critical patent/DE1479314A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1913—Control of temperature characterised by the use of electric means using an analogue comparing device delivering a series of pulses
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Temperaturregelung für eine Folienschweissvorrichtung.Temperature control for a film sealing device.

Dünne Kunststoff Folien eignen sich sehr gut für Verpackungszwecke. Mit Hilfe von einfachen Vorrichtungen können diese Folien durch Stromwärme zu Beuteln und Packungen zusammengeschweisst werden. Bei schnellen Verpackungsmaschinen wird die zur Schweissung erforderliche Wärmeenergie in an sich bekannter Weise durch impulsbeheizte Widerstandsbander erzeugt.Thin plastic films are very suitable for packaging purposes. With the help of simple devices, these foils can be made into bags by means of electrical heat and packs are welded together. With fast packaging machines the heat energy required for welding in a known manner pulse-heated resistance bands generated.

Fig. 1 zeigt eine schematische Anordnung im Schnitt. Von der durch den Stromimpuls erzeugten Wärmeenergie wird nur ein bestimmter Anteil dom Schweissgut zugeführt, ein anderer Teil wird vom unteren Schweissbacken aufgenommen. Durch den oberen Backen wird wiederum ein Teil der im Schweissgut vorhandenen Wärme abgeleitet. Diese Wärmemenge wird teilweise durch Leitung, teilweise durch Konvektion an die Umgebung abgegeben. in bestimmter Anteil dieser Energie dient jedoch zunächst dazu, die Temperatur des Schweissbackens bezw. die der gesamten Anordnung zu erhöhen, bis sich ein thermisches Gleichgewicht einstellt. Ähnliche Verhältnisse gelten auch für den unteren Backen.Fig. 1 shows a schematic arrangement in section. From the through The thermal energy generated by the current pulse is only a certain proportion of the weld metal another part is picked up by the lower welding jaw. Through the In turn, part of the heat present in the weld metal is dissipated in the upper jaw. This amount of heat is transferred partly by conduction and partly by convection Environment. in a certain proportion of this energy, however, is initially used to the temperature of the welding jaw respectively. to increase that of the entire arrangement, until a thermal equilibrium is established. Similar relationships also apply for the lower jaw.

:3 zeigt sich also, dass die Schweisstemperatur erst dann konstant bleiben kann, wenn sich die gesamte Anordnung im thermischen Gleichgewicht befindet. Eine einwandfreie Schweissnaht kann jedoch nur bei konstanter Schweisstemperatur erreicht werden. : 3 shows that the welding temperature is only then constant can remain when the entire arrangement is in thermal equilibrium. However, a perfect weld seam can only be achieved if the welding temperature is constant can be achieved.

Bei Folienschweissmaschinen wird somit erst nach einiger Laufzeit der Maschine eine ausreichend gute Schweissung erreicht. Während der mchr oder minder langen Anlaufzeit produziert die Maschine somit @usschuss; der gleiche Vorgang wiederholt sich selbstverständlich auch bei Betriebsunterbrechungen.In the case of film welding machines, it will take some time the machine achieves a sufficiently good weld. During the mchr or less long start-up time, the machine thus produces @soss; repeat the same process Of course, even in the event of business interruptions.

Die vorerwähnten Nachteile können vermieden werden, wenn man bei jeder Schweissung die zugeführte Wärmeenergie (Wärmeimpuls) den Temperaturverhältnissen an der Vorrichtung bezw. an der Schweissstelle anpasst.The aforementioned disadvantages can be avoided by looking at each one Welding the supplied heat energy (heat impulse) the temperature conditions BEZW on the device. adjusts at the welding point.

Bei der vorliegenden Erfindung geschieht dies durch Änderung der Impulszeit. Damit kann die Schweisstemperatur für jeden Betriebsfall auf den erforderlichen Wert eingestellt werden.In the present invention, this is done by changing the pulse time. This means that the welding temperature can be adjusted to the required level for each operating case Value can be set.

Wie aus dem Blockschaltbild Fig. 2-zu entnehmen ist, wird durch einen Auslöseimpuls vom Transportsystem der Schweissmaschine ein Zeitgeber angestossen. Durch die Ausgangsspannung des Zeitgebers kann ein entsprechendes Verstärkerelement (z. B. Relais, Thyratrons Thyristor, Elektronenröhre etc.) angesteuert werden, und über einen Schweisstransformator einen Stromimpuls im Schweissband erzeugen. Die Länge dieses Stromimpulses wird durch die Zeit des Zeitgebers vorgegeben.As can be seen from the block diagram of FIG. 2, a Trigger pulse from the transport system of the welding machine triggered a timer. The output voltage of the timer can be used to generate a corresponding amplifier element (e.g. relay, thyratron, thyristor, electron tube, etc.), and Generate a current pulse in the welding band via a welding transformer. the The length of this current pulse is given by the time of the timer.

Legt man in den Zeitkreis des Zeitgebers einen temperaturabhängigen Widerstand (Temperaturfühler) mit kleiner Wärmeträgheit, durch den die Temperaturverhaltnisse an der Schweisstelle erfasst werden können, so wird der Stromimpuls stets so dimensioniert, dass eine ausreichende konstante Schweisstemperatur entsteht.If you put a temperature-dependent one in the time circuit of the timer Resistance (temperature sensor) with low thermal inertia, through which the temperature conditions can be detected at the welding point, the current pulse is always dimensioned so that a sufficiently constant welding temperature is created.

Fig. 7 zeigt eine Gehaltungsausführung mit Transistoren. Die Transistoren T 1 und T 2 bilden zusammen in bekannter Weise einen monostabilen Multivibrator. Die Impulszeit des Multivibrators wird durch die Zeitglieder Rv, Rd und C bestimmt, wobei Rd den temperaturabhängigen Widerstand darstellt, Dieser Widerstand liegt unmittelbar im Schweissbacker an der Schweisstelle und verringert seinen Widerstandswe@t mit steigender Temperatur und damit auch die Impuiszeit des Impulsgebers.Figure 7 shows a transistor embodiment. The transistors T 1 and T 2 together form a monostable multivibrator in a known manner. The pulse time of the multivibrator is determined by the timers Rv, Rd and C, where Rd represents the temperature-dependent resistance, this resistance lies directly in the welding jaw at the welding point and reduces its resistance value with increasing temperature and thus also the pulse time of the pulse generator.

Durch entsprechende Wahl von Rv, Rd und C kann ein optimales Regelverhalten erreicht werden. Durch den Leistungstransistor T 3, der im Schaltbetrieb arbeitet, wird das Relais A für die Impulszeit angesteuert und das Schweissband erhält durch den Schweisstrafo Tr den gewünschten Stromimpuls.By appropriate choice of Rv, Rd and C an optimal control behavior can be achieved can be achieved. Through the power transistor T 3, which works in switching mode, the relay A is activated for the impulse time and the sweatband gets through the welding transformer Tr the desired current pulse.

Claims (2)

Patentansprüche: 1. Temperaturgeregelte Schweissvorrichtung, dadurch gekennzeichnet, dass in den Träger für das impulsbeheizte Schweissband ein temperaturabhängiger Widerstand (Temperaturfühler) eingefügt ist und die Impulsgabe für das Schweissband durch einen Zeitgeber erfolgt, in dessen Zeitkreis der temperaturabhängige Widerstand eingeschaltet ist. Claims: 1. Temperature-controlled welding device, thereby characterized in that in the carrier for the pulse-heated sweatband a temperature-dependent Resistance (temperature sensor) is inserted and the impulse for the sweatband takes place by a timer, in whose time circuit the temperature-dependent resistance is switched on. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass dem Zeitgeber ein Verstärkerelement (Relais, Elektronenröhre, Thyratronschaltung, Thristorschaltung oder dergl.) nachgeschaltet ist, das den Schweisstrafo entsprechend der durch den Zeitgeber vorgegebenen Zeit einschaltet und so einen variablen Wärmeimpuls an der Schweisstelle erzeugt, wodurch die Schweisstemperatur mit ausreichender Genauigkeit konstant gehalten wird.2. Apparatus according to claim 1, characterized in that the timer an amplifier element (relay, electron tube, thyratron circuit, thristor circuit Or the like.) Is connected downstream, which the welding transformer according to the by the Timer turns on and so a variable heat pulse at the Welding point generated, whereby the welding temperature with sufficient accuracy is kept constant. L e e r s i t eL e r s i t e
DE19651479314 1965-09-28 1965-09-28 Temperature control for a film sealing device Pending DE1479314A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG0044851 1965-09-28

Publications (1)

Publication Number Publication Date
DE1479314A1 true DE1479314A1 (en) 1969-07-17

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DE19651479314 Pending DE1479314A1 (en) 1965-09-28 1965-09-28 Temperature control for a film sealing device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814694A1 (en) * 1978-04-05 1979-10-18 Rudolf Ing Grad Wehinger Welding thermoplastic films - where impulse energised heater elements are initially over-energised for efficiency welding before reaching thermal equilibrium
EP0023589A1 (en) * 1979-07-11 1981-02-11 Rockwool International A/S Apparatus for welding together two plastic sheets
EP0155548A2 (en) * 1984-03-10 1985-09-25 Optima-Maschinenfabrik Dr. Bühler GmbH & Co. Apparatus for welding sheets
EP1707340A1 (en) * 2005-03-29 2006-10-04 Hans Wolf Sealing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814694A1 (en) * 1978-04-05 1979-10-18 Rudolf Ing Grad Wehinger Welding thermoplastic films - where impulse energised heater elements are initially over-energised for efficiency welding before reaching thermal equilibrium
EP0023589A1 (en) * 1979-07-11 1981-02-11 Rockwool International A/S Apparatus for welding together two plastic sheets
EP0155548A2 (en) * 1984-03-10 1985-09-25 Optima-Maschinenfabrik Dr. Bühler GmbH & Co. Apparatus for welding sheets
EP0155548A3 (en) * 1984-03-10 1986-02-19 Optima-Maschinenfabrik Dr. Buhler Gmbh & Co. Apparatus for welding sheets
EP1707340A1 (en) * 2005-03-29 2006-10-04 Hans Wolf Sealing device

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