DE2244820A1 - Welding moving thermoplastic sheets - using vibratory welding bar to permit sliding of sheets between welding bars without sticking - Google Patents

Welding moving thermoplastic sheets - using vibratory welding bar to permit sliding of sheets between welding bars without sticking

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Publication number
DE2244820A1
DE2244820A1 DE2244820A DE2244820A DE2244820A1 DE 2244820 A1 DE2244820 A1 DE 2244820A1 DE 2244820 A DE2244820 A DE 2244820A DE 2244820 A DE2244820 A DE 2244820A DE 2244820 A1 DE2244820 A1 DE 2244820A1
Authority
DE
Germany
Prior art keywords
jaw
welding
jaws
sheets
vibrating
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
DE2244820A
Other languages
German (de)
Inventor
Ehrhart Schulze
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.)
STIEGLER MASCHF FELIX
Original Assignee
STIEGLER MASCHF FELIX
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 STIEGLER MASCHF FELIX filed Critical STIEGLER MASCHF FELIX
Priority to DE2244820A priority Critical patent/DE2244820A1/en
Publication of DE2244820A1 publication Critical patent/DE2244820A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B29C66/00441—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool movable, e.g. mounted on reels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/8244—Actuating mechanisms magnetically driven
    • 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
    • B29C66/80—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
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement 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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • 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
    • B29C66/93431—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A machine for welding thermoplastics sheets while in motion comprises two welding bars between which the sheets are fed. At least one bar is connected to a vibrator. The direction of vibration is towards the other bar and the spacing between the bar faces is at most equal to the vibrational amplitude plus the total thickness of sheets. The spacing can be adjusted. Pneumatic or electromagnetic drive may be used. The welding bar is pref. of plastics with a minimum softening pt. of 600 degrees C; a tensioned, heat-resisting plastics (e.g. Teflon, RTM) strip may be fitted over the resistance wire used for heating.

Description

Vorrichtung zum Schweißen von thermoplastischen Folien Die Erfindung betrifft eine Vorrichtung zum Schweißen von thermoplastischen Folien, die während des Schweißens zwischen zwei Backen hindurchbewegt werden, von denen eine zum Erhitzen der Schweißstelle beheizbar ist und beide Backen die Folien während des Schweißens berühren. Device for welding thermoplastic films The invention relates to a device for welding thermoplastic films, which during of welding are moved between two jaws, one of which for heating the welding point can be heated and both jaws cover the foils during welding touch.

Durch die DOS 1 604 607 ist eine Vorrichtung zum Schweißen von thermoplastischen Folien, die während des Schweißens bewegt werden, bekannt, bei der zum Erhitzen der Schweißstelle ein Stab mit Quarzstrahler in einer rotierenden Trommel angeordnet ist, wobei die Trommel in ihrer Mantelfläche einen sich in axialer Richtung erstreckenden Schlitz zum Durchlaß der Hitzestrahlen aufweist. Diese bekannte Vorrichtung ist zum Herstellen von Schweißnähten vorgesehen, die sich quer zu der Richtung erstrecken, in der sich die Folien beim Schweißen bewegen.DOS 1 604 607 describes a device for welding thermoplastic Foils, which are moved during welding, are known to be used for heating the welding point a rod with quartz radiator arranged in a rotating drum is, the drum in its jacket surface extending in the axial direction Has slot for the passage of the heat rays. This known device is intended for making welds that extend transversely to the direction in which the foils move during welding.

Bei diesen bekannten Vorrichtungen handelt es sich um sehr aufwendige Konstruktionen, die außerdem einen erheblichen Platz beanspruchen. Auch hat diese bekannte Vorrichtung den Nachteil, daß Schweißnähte nicht hergestellt werden können, die sich in einer Richtung erstrecken, die mit der Bewegungsrichtung der Folie zusammenfällt.These known devices are very complex Constructions that also take up a considerable amount of space. Also has this known device the disadvantage that welds can not be made, which extend in a direction which coincides with the direction of movement of the film.

Bei der eingangs genannten Vorrichtung werden diese Nachteile dadurch vermieden, daß die beheizbare Schweißbacke kufenartig ausgebildet ist und auf den sich während des Schweißens bewegenden Folien schleift. Diese bekannte Vorrichtung hat zwar den Vorteil einer außerordentlich kurzen Bauweise. Ihr Nachteil besteht jedoch darin, daß es bei manchen Folienarten zu einem Abrieb oder Stau von Folienresten in der Einlauf zone der kufenförmigen Backe kommt.In the case of the device mentioned at the beginning, these disadvantages are thereby eliminated avoided that the heatable welding jaw is designed like a runner and on the foil that moves during welding grinds. This known device Although it has the advantage of an extremely short design. Their disadvantage is there however, in the fact that with some types of film there is an abrasion or jamming of film residues comes in the inlet zone of the runner-shaped jaw.

Der Erfindung liegt die Aufgabe zu Grunde, eine Vorrichtung zum Schweißen von thermoplastischen Folien, die während des Schweißens zwischen zwei Backen hindurchbewegt werden, zu schaffen, bei der ein Abrieb und Stau von Folienresten in der Einer laufzonebeheizbaren Backe nicht eintritt, auch wenn beide Backen die Folie während des Schweißens berühren.The invention is based on the object of a device for welding of thermoplastic foils that move between two jaws during welding to create in the case of abrasion and jamming of film residues does not occur in the one heated jaw, even if both jaws have the Touch the foil during welding.

Diese Aufgabe ist bei einer Vorrichtung der eingangs genannten Art gemäß der Erfindung dadurch gelöst, daß mindestens eine Backe als Schwingbacke mit einem Schwingungserzeuger so verbunden ist, daß eine Schwingung der Schwingbacke in Richtung auf die andere Backe erzeugbar ist, und daß der Abstand der beiden Backen voneinander höchstens so groß ist wie die Summe aus der Amplitude der Schwingbackenschwingung und der Gesamtdicke der zum Schweißen zwischen die Backen einzuführenden Folien.This task is in a device of the type mentioned solved according to the invention in that at least one jaw as a vibrating jaw with a vibration generator is connected so that an oscillation of the vibrating jaw can be generated in the direction of the other jaw, and that the distance between the two jaws from each other is at most as large as the sum of the amplitude of the vibrating jaw oscillation and the total thickness of the foils to be inserted between the jaws for welding.

Dadurch wird erreicht, daß die Folie dauernd von der behei#baren Backe berührt und wieder freigegeben wird. Dadurch wird aber mit Sicherheit erreicht, daß es zu keinem Abrieb und zu keinem Stau von Folienresten in der Einlaufzone kommt.This ensures that the film is permanently removed from the heated jaw is touched and released again. But this will certainly achieve that there is no abrasion and no jamming of film residues in the inlet zone.

Bei einer vorteilhaften Ausführungsform ist vorgesehen, daß eine Einstellvorrichtung zum Einstellen verschiedener Abstände zwischen den Backen vorhanden ist. Dadurch kann die Vorrichtung an verschieden dicke und verschieden viele zu verschweißende Folien angepaßt werden. Ein weiterer Vorteil besteht darin, daß, wenn der Abstand zwischen den beiden Backen kleiner ist als die Summe aus der Amplitude der Schwingbackenschwingung und der Gesamtdicke der zum Schweißen zwischen den Backen einzuführenden Folien der Druck der Backen auf die Schweißstelle durch diesen Abstand geregelt werden kann. Gleichzeitig wird dadurch die Berührungszeit, innerhalb deren beide Backen die zu schweißenden Folien berühren, mit abnehmendem Abstand vergrößert. Besonders vorteilhaft kann es hierbei zur Regelung dieser Eerührungszeit sein, wenn der Schwingantrieb der Schwingbacke kraftschlüssig, vorzugsweise pneumatisch oder elektrornagnetisch, ist. Dadurch kann der Abstand zwischen den Backen noch weiter verringert werden als die elastisçhe Nachgiebigkeit der Folien und der Backen bei formschlüssigem Antrieb der Schwingbacke zulassen würde.In an advantageous embodiment it is provided that an adjusting device to set different distances between the jaws. Through this the device can be of different thicknesses and different numbers to be welded Slides are customized. Another advantage is that when the distance between the two jaws is smaller than the sum of the amplitude of the vibrating jaw oscillation and the total thickness of the foils to be inserted between the jaws for welding the pressure of the jaws on the weld can be regulated by this distance can. At the same time, this increases the contact time within which both jaws touch the foils to be welded, enlarged with decreasing distance. Particularly It can be advantageous here to regulate this contact time if the oscillating drive the vibrating jaw non-positively, preferably pneumatically or electromagnetically, is. This allows the distance between the jaws to be reduced even further than the elastic resilience of the foils and the jaws in the case of form-fitting Would allow the swing jaw to be driven.

Bei einem bevorzugten Ausführungsbeispiel bewegen sich die zu schweißenden Folien in dauernder Berührung längs einer nicht beheizbaren Backe , während die beheizbare Backe als Schwingbacke die Folien nur in Abhängigkeit von der Schwingungsfrequenz kurzzeit berührt. Die Folie kann aber auch umgekehrt die nicht beheizte Schwingbacke dauernd berühren und von dieser immer kurzzeitig an die beheizte stillstehende Backe angedrückt werden. Schließlich können auch beide Backen Schwingbakken sein. Wenn dann ihre Schwingungen auf Gegenphase synchronisiert sind und die Folien so zwischen den Backen hindurchgeführt werden, daß beim größten Abstand der Backen voneinander diese die Folien nicht berühren,können sowohl eine der beiden Backen oder auch gleichzeitig beide Backen beheizbar-sein.- ---# -~-~ Die Erfindung und weiterer vorteilhafte Weiterbildungen derselben sind in der folgenden Beschreibung von in der Zeichnung dargestellten Ausführungsbeispielen im einzelnen erläutert.In a preferred embodiment, those to be welded move Foils in constant contact along a non-heatable jaw, while the Heatable jaw as a vibrating jaw, the foils only depending on the vibration frequency briefly touched. Conversely, however, the film can also be the unheated oscillating jaw keep touching and from this always briefly to the heated, stationary jaw be pressed. Finally, both jaws can be swing jaws. if then their vibrations are synchronized to antiphase and the slides so between the jaws are passed through that at the greatest distance of the jaws from each other if these do not touch the foils, either one of the two jaws or at the same time both jaws can be heated. - --- # - ~ - ~ The invention and other advantageous ones Developments of the same are in the following description of in the drawing illustrated embodiments explained in detail.

Es zeigen: Fig. 1 einen Längsschnitt eines erstenAusführungsbeispieles einer erfindungsgemäßen Vorrichtung; Fig. 2 einen Schnitt nach der Linie II - II in Fig. 1; Fig. 3 einen der Fig. 1 entsprechenden Schnitt eines zweiten Ausführungsbeispieles.1 shows a longitudinal section of a first embodiment a device according to the invention; Fig. 2 is a section along the line II - II in Fig. 1; 3 shows a section, corresponding to FIG. 1, of a second exemplary embodiment.

In einem in der Zeichnung nicht näher dargestellten, die erz in dungsgemäße Vorrichtung tragenden Gestell sind zwei Walzen 11 und 12 um einander parallele gestellfeste Achsen drehbar gelagert. Diese Walzen dienen dazu, ein aus mehreren Ubereinander liegenden thermoplastischen Folien gebildetes Band 13 durch die Schweißvorrichtung in Richtung des Pfeiles 14 mit gleichbleibender Geschwindigkeit hindurchzuführen. Die Schweißvorrichtung welstzu diesem Zweck eine beheizbare Backe 15 und eine nicht beheizbare Backe 16 auf, von denen die beheizbare Backe 15 in der Draufsicht als schmales Rechteck ausgebildet ist, das sich in der Bewegungsrichtung des Bandes 13 erstreckt.In a not shown in the drawing, the ore in proper Device-supporting frame are two rollers 11 and 12 fixed to the frame, which are parallel to one another Axles can be rotated. These rollers serve to be one of several Overlying thermoplastic films formed band 13 by the welding device pass in the direction of arrow 14 at a constant speed. For this purpose, the welding device requires one heatable jaw 15 and one not heated jaw 16, of which the heated jaw 15 in plan view as narrow rectangle is formed, which extends in the direction of movement of the belt 13 extends.

Die nicht beheizbare Backe 16 ist mit einer gestellfesten Platte 17 unterhalb des Bandes 13 befestigt und so angeordnet, daß das Band 13 beim Durchlaufen immer auf der Oberseite der Backe 16 aufliegt.The non-heatable jaw 16 has a plate 17 fixed to the frame attached below the belt 13 and arranged so that the belt 13 when passing through always rests on the top of the jaw 16.

20 Die beheizbare Backe 15 ist am Schwinganker/eines Schwingmaqneten 19 befestigt, der wiederum auf einer Platte 21 befestigt ist, die längs Säulen 22 auf und ab bewegbar und feststellbar ist. Die Säulen 22 sind auf der gestellfesten Platte 17 befestigt. Die Platte 21 ist mittels Schrauben 23 zum Einstellen eines bestimmten Abstandes 24 zwischen den beiden Backen 15 und 16 an den Säulen 22 feststellbar. Zum Feineinstellen des Abstandes 24 kann ein besonderes, in der Zeichnung nicht dargestelltes Getriebe, z.B. eine Mikrometerschraube, vorgesehen sein. 20 The heatable jaw 15 is on the oscillating armature / a Schwingmaqneten 19, which in turn is fastened to a plate 21 running along columns 22 is movable up and down and lockable. The pillars 22 are fixed to the frame Plate 17 attached. The plate 21 is by means of screws 23 for adjusting a certain distance 24 between the two jaws 15 and 16 on the pillars 22 can be determined. To fine-tune the distance 24, a special one cannot be used in the drawing transmission shown, e.g. a micrometer screw, may be provided.

Um die Backe 15 einwandfrei zu führen, wenn diese vom Schwingmagneten 19 in Schwingung versetzt wird, weist sie an ihr befestigte Führungsstangen 25 auf, die in Führungshülsen 26 geführt sind, die an der Platte 21 befestigt, z.B. in diese eingeschraubt sind. Die Führungshülsen 26 weisen in der Zeichnung nicht dargestellte Kugellager zum Führen der Führungsstangen 25 auf.In order to properly guide the jaw 15 when it is from the vibrating magnet 19 is set in vibration, it has guide rods 25 attached to it, which are guided in guide sleeves 26 which are fastened to the plate 21, e.g. in this are screwed in. The guide sleeves 26 have not shown in the drawing Ball bearings for guiding the guide rods 25.

Die Backe 15 besteht aus einem Kunststoff mit hohem, bei mindestens 6000C liegendem Erweichungspunkt, sodaß sie Temperaturen bis zu 6000C aushält. Als Heizkörper der Backe 15 ist auf ihrer der anderen Backe 16 zugekehrten Oberfläche ein Widerstandsband 27 befestigt, dessez teide Enden mit an der Backe 15 vorgesehenen Anschlußklemmen/verbunden sind Über das Widerstandsband 27 ist ein Band 29 gespannt, das aus einem hitzebeständigen Kunststoff, wie er z.B. im Handel unter der Bezeichnung "Teflon" bekannt ist, besteht, Beide Enden des Bandes 29 sind mit Stangen 31 verbunden, die die zu beiden Seiten des Bandes 13 liegenden Säulen 22 miteinander verbinden und sich somit über das Band 13 erstrecken.The jaw 15 is made of a plastic with a high, at least 6000C lying softening point, so that it can withstand temperatures of up to 6000C. As a radiator the jaw 15 is a resistance band on its surface facing the other jaw 16 27 attached, dessez teide ends with terminals provided on the jaw 15 / connected are over the resistance band 27, a band 29 is stretched, which consists of a heat-resistant Plastic, as it is known in the trade under the name "Teflon", for example, Both ends of the belt 29 are connected to rods 31, which are on both sides of the band 13 lying pillars 22 connect with each other and thus via the Volume 13 extend.

Während des Betriebes wird der Schwingmagnet 19 eingeschaltet und das Widerstandsband 27 mit Heizstrom beschickt, so daß die nun als Schwingbacke wirkende Backe 15 gleichzeitig als Schweißbacke dient und durch die Tätigkeit des Schwingmagneten 19 mit einer bestimmten Frequenz auf und ab bewegt wird. Wird nun das aus mehreren übereinanderliegenden thermoplastischen Folien zusammengesetzte Band 13 über die Walzen 11 und 12 durch den Zwischenraum zwischen den Backen 15 und 16 hindurchgeführt, dann wird das Band 13 dauernd für kurze Zeit von der Schwingbacke 15 berührt, wenn der Abstand 24 so eingestellt ist, daß er nicht größer ist als die Summe der Amplitude der Schwingung der Schwingbacke und der Dicke des Bandes 13. Durch Verringern des Abstandes 24 wird bei gleichbleibender Schwingungsfrequenz der Schwingbacke 15 die Berührungszeit, innerhalb deren die Backe 15 das Band 13 berührt, vergrößert. Da der Schwingantrieb der S chwingbacke 15 bei einem Schwingmagneten nur kraftschlüssig und nicht formschlüssig ist, kann der Abstand 24 im Grenzfall auf die Dicke des Bandes 13 verringert werden, so daß dann das Band 13 dauernd von beiden Backen berührt wird und nur der Berührungsdruck sich periodisch ändert. Die Vorrichtung kann also durch Regelung des Abstandes 24 so zwischen den beiden Grenzfällen eingestellt werden, daß das Band 13 entweder nur kurzzeitig und praktisch ohne Druck periodisch von der Backe 15 berührt wird oder im anderen Grenzfall die Backe 15 dauernd am Band 13 mit sich periodisch wechselndem Druck anliegt. Die in der Praxis vor allem in Frage kommenden Fälle liegen natürlich zwischen diesen beiden Grenzfällen.During operation, the oscillating magnet 19 is switched on and the resistance band 27 is charged with heating current, so that the now as a vibrating jaw Acting jaw 15 also serves as a welding jaw and by the activity of the Vibrating magnet 19 is moved up and down at a certain frequency. Will now the one composed of several superimposed thermoplastic films Belt 13 over rollers 11 and 12 through the space between jaws 15 and 16 passed through, then the belt 13 is continuously for a short time from the vibrating jaw 15 touches when the distance 24 is set so that it is not greater than the sum of the amplitude of the vibration of the vibrating jaw and the thickness of the belt 13. By reducing the distance 24, the oscillation frequency remains the same the vibrating jaw 15 the contact time within which the jaw 15 the belt 13 touched, enlarged. Since the vibratory drive of the swing jaw 15 in a vibrating magnet is only frictionally and not positively, the distance 24 can in the borderline case can be reduced to the thickness of the band 13, so that then the band 13 continuously of both jaws is touched and only the contact pressure changes periodically. the The device can thus by regulating the distance 24 between the two borderline cases be set that the belt 13 either only briefly and is periodically touched by the jaw 15 practically without pressure or in the other borderline case the jaw 15 rests continuously on the belt 13 with periodically changing pressure. the In practice, the cases that come into question naturally lie between these both borderline cases.

Durch das dauernde Abheben der Backe 15 von dem Band 13 wird mit Sicherheit vermieden, daß sich in der Einlauf zone der Bakke 15, also in Fig. 1 auf der linken Seite, Folienreste stauen.The constant lifting of the jaw 15 from the belt 13 is with certainty avoided that in the inlet zone of the Bakke 15, so in Fig. 1 on the left Side, jam film scraps.

Auch wird dadurch mit Sicherheit ein Abrieb der von der Backe 15 berührten Folie vermieden.This also results in abrasion of those touched by the jaw 15 with certainty Foil avoided.

Das in Fig. 3 dargestellte Ausführungsbeispiel unterscheidet sich von dem in den Fig. 1 und 2 dargestellten Ausführungsbeispiel dadurch, daß hier beide Backen als Schwingbacken 15 ausgebildet sind. Die untere Schwingbacke 15 ist in der gleichen Weise beheizt und mit einem Schwingmagneten 19 verbunden wie die obere Backe 15, so daß für alle entsprechenden Teile beider Backen die gleichen Bezugszahlen wie in Fig. 1 gewählt worden sind. Der Unterschied besteht lediglich darin, daß die beiden Walzen 11 und 12 das Band 13 so zwischen den beiden Backen 15 hindurchführen, daß bei größtem Abstand 24 keine der beiden Backen 15 vom Band 13 berührt wird.Werden beide Schwingmagneten 19 mit dem gleichen Wechselstrom gespeist, dann ist gewährleistet, daß ihre Schwingungen auf Gegenphase synchronisiert sind, was bei diesem Ausführungsbeispiel vorzuziehen ist. Durch dieses Ausführungsbeispiel wird erreicht, daß die Schweißung gleichmäßig auf beiden Seiten erfolgt, so daß ein sicheres Durchschweißen auch bei dickeren Bändern 13 gewährleistet ist.The embodiment shown in Fig. 3 differs of the embodiment shown in Figs. 1 and 2 in that here both jaws are designed as oscillating jaws 15. The lower swing jaw 15 is heated in the same way and connected to a vibrating magnet 19 as the upper jaw 15 so that the same for all corresponding parts of both jaws Reference numbers as in Fig. 1 have been chosen. The only difference is in that the two rollers 11 and 12, the belt 13 so between the two jaws 15 pass that at the greatest distance 24 neither of the two jaws 15 from the belt 13 is touched. If both oscillating magnets 19 are fed with the same alternating current, then it is guaranteed that their oscillations are synchronized to antiphase, which is preferable in this embodiment. Through this embodiment it is achieved that the weld takes place evenly on both sides, so that a reliable through-welding is guaranteed even with thicker strips 13.

Die Vorrichtung nach den Fig. 1 und 2 kann auch so abgewandelt sein, daß die Walzen 11 und 12 so angeordnet sind, daß sie die Backe 15 immer berühren und die Backe 15 während ihrer Schwingung das Band 13 dann periodisch an die Backe 16 andrückt. In diesem Fall wäre es zweckmäßig,die Backe 16 als Schweißbacke auszubilden, was z.B. dadurch geschehen kann, daß das Widerstandsband 27 auf der Backe 16 angeordnet wird.The device according to FIGS. 1 and 2 can also be modified so that the rollers 11 and 12 are arranged so that they always touch the jaw 15 and the jaw 15 then periodically attaches the belt 13 to the jaw as it oscillates 16 presses. In this case, it would be useful to design the jaw 16 as a welding jaw, what can happen, for example, that the resistance band 27 on the jaw 16 is placed.

Beim dargestellten Ausführungsbeispiel ist als Schwingungserzeuger ein Schwingmagnet 19 vorgesehen. Anstelle eines Schwingmagneten 19 kann ein beliebiger anderer Schwingungserzeuger, z.B. ein pneumatischer Schwingungserzeuger vorgesehen sein. Der Schwingantrieb der Backe 15 kann hierbei auch formschlüssig sein. Vorzuziehen ist jedoch aus den oben genannten Gründen ein kraftschlüssiger Antrieb.In the illustrated embodiment is as a vibration generator an oscillating magnet 19 is provided. Instead of an oscillating magnet 19, any Another vibration generator, e.g. a pneumatic vibration generator, is provided be. The oscillating drive of the jaw 15 can here also be form-fitting. Preferable however, for the reasons mentioned above, it is a force-fit drive.

Claims (9)

Patentansprüche Claims Vorrichtung zum Schweißen von thermoplastischen Folien, die während des Schweißens zwischen zwei Backen hindurchbewegt werden, von denen eine zum Erhitzen der Schweißstelle beheizbar ist und beide Backen die Folien während des Schweißens berühren, dadurch gekennzeichnet, daß mindestens eine Backe (15) als Schwingbacke mit einem Schwingungserzeuger (19) so verbunden ist, daß eine Schwingung der Schwingbacke in Richtung auf die andere Backe (16) erzeugbar ist, und daß der Abstand (24) der beiden Backen (15, 16) voneinander höchstens so groß ist wie die Summe aus der Amplitude der Schwingbackenschwingung und der Gesamtdicke der zum Schweißen zwischen die Backen einzuführenden Folien.Device for welding thermoplastic films, which during of welding are moved between two jaws, one of which for heating the welding point can be heated and both jaws cover the foils during welding touch, characterized in that at least one jaw (15) as a vibrating jaw is connected to a vibration generator (19) so that an oscillation of the vibrating jaw in the direction of the other jaw (16) can be generated, and that the distance (24) of the two jaws (15, 16) from each other is at most as large as the sum of the amplitude the vibrating jaw vibration and the total thickness for welding between the jaws slides to be introduced. 2) Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß eine Einstellvorrichtung (22, 23) zum Einstellen verschiedener Abstände (24) zwischen den Backen (15, 16) vorhanden ist. 2) Device according to claim 1, characterized in that a Adjusting device (22, 23) for adjusting different distances (24) between the jaws (15, 16) is present. 3) Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Schwingantrieb der Schwingbacke (15) kraftschlüssig, vorzugsweise pneumatisch oder elektromagnetisch, ist. 3) Device according to claim 1 or 2, characterized in that the oscillating drive of the oscillating jaw (15) non-positively, preferably pneumatically or electromagnetic. 4) Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die beheizbare Backe (15) die Schwingbacke ist. 4) Device according to one of claims 1 to 3, characterized in that that the heated jaw (15) is the oscillating jaw. 5) Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß beide Backen (15) Schwingbacken sind und daß ihre Schwingungen auf Gegenphase synchronisiert sind. 5) Device according to one of claims 1 to 4, characterized in that that both jaws (15) are vibrating jaws and that their vibrations are in antiphase are synchronized. 6) Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß beide Backen (15) beheizbar sind. 6) Device according to one of claims 1 to 5, characterized in that that both jaws (15) can be heated. 7) Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß mindestens die. beheizbare Backe (15) aus einem Kunststoff mit hohem, vorzugsweise bei mindestens 6000C liegendem Erweichungspunkt besteht und daß als Heizkörper der beheizbaren Backe auf ihrer der anderen Backe (16) zugekehrten Oberfläche ein Widerstandsband (27) vorhanden ist.7) Device according to one of claims 1 to 6, characterized in that that at least the. heatable jaw (15) made of a plastic with a high, preferably at least 6000C lying softening point and that as a radiator the heatable jaw a resistance band on its surface facing the other jaw (16) (27) is present. 8) Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die der Gegenbacke (16) zugekehrte Oberfläche mindestens der beheizbaren Backe (15) von einer Schicht eines hitzebeständigen'Kunststoffes bedeckt ist.8) Device according to one of claims 1 to 7, characterized in that that the opposing jaw (16) facing surface of at least the heatable jaw (15) is covered by a layer of heat-resistant plastic. 9) Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß als hitzebeständige Kunststoffschicht ein über die Oberfläche der Backe (15) gespanntes Band (29) aus hitzebeständigem Kunststoff gespannt ist.9) Device according to claim 8, characterized in that as a heat-resistant Plastic layer from a band (29) stretched over the surface of the jaw (15) heat-resistant plastic is stretched.
DE2244820A 1972-09-13 1972-09-13 Welding moving thermoplastic sheets - using vibratory welding bar to permit sliding of sheets between welding bars without sticking Pending DE2244820A1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757628A1 (en) * 1977-12-23 1979-06-28 Kiefel Hochfrequenz Paul Edge-sealing two superposed plastics films together - and severing along the resulting seams, using smooth welding tool and contoured counter-tool
EP0278927A2 (en) * 1987-02-13 1988-08-17 A.W.A.X. PROGETTAZIONE E RICERCA S.r.l. Device for continuous hot-sealing of thermoplastic films
EP0317724A1 (en) * 1987-09-28 1989-05-31 WindmÀ¶ller & Hölscher Welder for welding plastics webs together
EP0335270A1 (en) * 1988-03-28 1989-10-04 Evald A. Nyborg A/S An apparatus for sequential sealing of at least two endless panels of thermoplastic material along predetermined outlines and for cutting articles from one or more of such endless panels
EP0387373A2 (en) * 1988-03-04 1990-09-19 Paul Kiefel Gmbh Method and apparatus for manufacturing pliable objects, such as book covers, folding containers or the like
EP0704541A3 (en) * 1994-09-28 1997-06-25 Vipa S R L Studio Progettazion Plate press for embossing or glazing, particularly for hides and the like
WO1997035708A1 (en) * 1996-03-25 1997-10-02 Schur Consumer Products A/S A method for producing ice cube bags

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757628A1 (en) * 1977-12-23 1979-06-28 Kiefel Hochfrequenz Paul Edge-sealing two superposed plastics films together - and severing along the resulting seams, using smooth welding tool and contoured counter-tool
EP0278927A2 (en) * 1987-02-13 1988-08-17 A.W.A.X. PROGETTAZIONE E RICERCA S.r.l. Device for continuous hot-sealing of thermoplastic films
EP0278927A3 (en) * 1987-02-13 1990-07-25 A.W.A.X. PROGETTAZIONE E RICERCA S.r.l. Device for continuous hot-sealing of thermoplastic films
EP0317724A1 (en) * 1987-09-28 1989-05-31 WindmÀ¶ller & Hölscher Welder for welding plastics webs together
US4954206A (en) * 1987-09-28 1990-09-04 Windmoller & Holscher Welding apparatus for welding plastic web including tensioned strips of polytetrafluoroethylene
EP0387373A2 (en) * 1988-03-04 1990-09-19 Paul Kiefel Gmbh Method and apparatus for manufacturing pliable objects, such as book covers, folding containers or the like
EP0387373A3 (en) * 1988-03-04 1992-01-02 Paul Kiefel Gmbh Method and apparatus for manufacturing pliable objects, such as book covers, folding containers or the like
EP0335270A1 (en) * 1988-03-28 1989-10-04 Evald A. Nyborg A/S An apparatus for sequential sealing of at least two endless panels of thermoplastic material along predetermined outlines and for cutting articles from one or more of such endless panels
EP0704541A3 (en) * 1994-09-28 1997-06-25 Vipa S R L Studio Progettazion Plate press for embossing or glazing, particularly for hides and the like
WO1997035708A1 (en) * 1996-03-25 1997-10-02 Schur Consumer Products A/S A method for producing ice cube bags

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