DE938499C - Process and devices for the dielectric production of welded joints between several plastic bodies when using adjustable preheating by means of infrared radiators - Google Patents
Process and devices for the dielectric production of welded joints between several plastic bodies when using adjustable preheating by means of infrared radiatorsInfo
- Publication number
- DE938499C DE938499C DES21834A DES0021834A DE938499C DE 938499 C DE938499 C DE 938499C DE S21834 A DES21834 A DE S21834A DE S0021834 A DES0021834 A DE S0021834A DE 938499 C DE938499 C DE 938499C
- Authority
- DE
- Germany
- Prior art keywords
- infrared
- focal point
- reflector
- welding
- radiators
- 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.)
- Expired
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
- B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
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- 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
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
- B29C65/1412—Infrared [IR] radiation
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1432—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface direct heating of the surfaces to be joined
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
- B29C65/1438—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding focusing the wave energy or particle radiation on the interface
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
- B29C65/1441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding making use of a reflector on the opposite side, e.g. a polished mandrel or a mirror
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1445—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface heating both sides of the joint
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1454—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined
- B29C65/1458—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface scanning at least one of the parts to be joined once, i.e. contour welding
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- 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
- B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
- B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
- B29C65/1464—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators
- B29C65/1467—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface making use of several radiators at the same time, i.e. simultaneous welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/024—Thermal pre-treatments
- B29C66/0242—Heating, or preheating, e.g. drying
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- 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
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- 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
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- 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
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- 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
- B29C66/932—Measuring or controlling the joining process by measuring or controlling the speed by measuring the speed
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0033—Heating devices using lamps
- H05B3/0038—Heating devices using lamps for industrial applications
- H05B3/0057—Heating devices using lamps for industrial applications for plastic handling and treatment
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- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
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- 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
- B29C66/45—Joining of substantially the whole surface of the articles
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Thermal Sciences (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Verfahren und Einrichtungen zur dielektrischen Herstellung von Schweißverbindungen zwischen mehreren Xunststoffkörp ern bei Verwendung einer regelbaren Vorerwärmung mittels Infrarotstrahlern Beim dielektrischen Schweißen von Kunststoffkörpern, insbesondere sdchen größerer Dicke, kann man zur Ersparnis von Hochfrequenzenergie die Verbindungsflächen durch Heißluft oder durch z. B. elektrisch beheizte Lötkolben vorwärmen. Bei rasch wechselnden Schweiß- bzw. Transportgeschwindigkeiten läßt sich dann jedoch die Vorwärmtemperatur nicht in dem erforderlichen Maße regeln. Es können daher bei kleinen Schweißgeschwindigkeiten Verbrennungen oder Durchschläge an den Kunststoffkörpern auftreten, während bei größeren Geschwindigkeiten die zum Verschweißen benötigte Temperatur meist nicht mehr erreicht wird. Processes and devices for the dielectric production of welded joints between several plastic bodies when using adjustable preheating by means of infrared heaters In the dielectric welding of plastic bodies, in particular For larger thicknesses, the connection surfaces can be used to save high-frequency energy by hot air or by z. B. preheat electrically heated soldering irons. At quickly however, the preheating temperature can then be adjusted with changing welding or transport speeds not regulate to the necessary extent. It can therefore be used at low welding speeds Burns or punctures occur on the plastic bodies while at the temperature required for welding is usually not achieved at higher speeds more is achieved.
Die Erfindung hat zur Aufgabe, diese Nachteile zu beseitigen. Bei dem Verfahren zur Erzielung gleicher Erwärmungstemperatur bei der Herstellung von Schweißverbindungen zwischen mit wechselnder Vorschubgeschwindigkeit bewegten Kunststoffolien unter Anwendung einer Vorerwärmung werden erfindungsgemãß die Verbindungsstellen der Körper durch Infrarotstrahler erwärmt, deren Strahlungsintensität in Abhängigkeit von der Schweißgeschwindigkeit und bzw. oder der Transportgeschwindigkeit der Körper geregelt wird. Dabei können die Schweißstellen wie bei dem vorerwähnten bekannten Verfahren lediglich ebenfalls nur vorgewärmt werden, worauf dann die eigentliche Erhitzung auf die Schweißtemperatur, z. B. wieder in einem hochfrequenten elektrischen Kondensatorfeld, erfolgt und gegebenenfalls gleichzeitig oder auch anschließend die.Körper durch Druck, der von den Kondensa,torelektroden selbst ausgeübt sein kann, vereinigt werden. Nach dem erfindungsgemäben Verfahren ist es aber a.uch möglich, die Verbindungsstelle bereits durch die Infrarotstrahler allein auf die Schweißtemperatur zu bringen und im Anschluß an diese Erwärmung die Körper durch Druck, beispielsweise einer Stangen- oder Rotationspresse, miteinander zu verbinden. The invention aims to eliminate these disadvantages. at the process for achieving the same heating temperature in the manufacture of Welded connections between plastic foils moving with changing feed speeds according to the invention, the connection points are made using preheating the body is heated by infrared emitters, the intensity of which depends on the radiation on the welding speed and / or the transport speed of the body is regulated. The welds can be as in the case of the known one mentioned above Process are only also only preheated, whereupon the actual Heating to the welding temperature, e.g. B. again in a high frequency electrical Capacitor field, takes place and optionally simultaneously or also subsequently die.Kkörper due to pressure exerted by the capacitor electrodes themselves can be united. According to the method according to the invention, however, it is also possible the connection point already affects the welding temperature through the infrared heater alone to bring and following this heating the body by pressure, for example a bar or rotary press to connect with each other.
Im Gegensatz zu einer Erwärmung durch Heißluft oder durch einen lötkolbenartigen Heizkeil lassen sich Infrarotstrahler in einfacher Weise in Abhängigkeit von der Schweiß- und Transportgeschwindigkeit so regeln, daß ein Über- oder Unterschreiten der Solltemperatur nicht eintreten kann. Sind z. B. beim Arbeiten im Durchlaufverfahren mehrere Infrarotstrahler in Reihe hintereinander längs der Schweißnaht vorgesehen, um diese allmählich entsprechend aufzuheizen, so genügt im allgemeinen bereits die Zu- und Abschaltung einzelner Strahler, um die Temperatur des Schweißgutes in der gewünschten Richtung zu beeinflussen. Dem gleichen Zweck können auch einstellbare Blenden, z. B. Irisblenden, Schlitzblenden od. dgl., vor den Strahlern oder Änderungen der an diese Strahler angelegten Spannung dienen. Von besonderem Vorteil ist es im letzteren Fall, daß mit einer Erniedrigung der Spannung nicht nur das Temperaturmaximum absinkt, sondern sich gleichzeitig auch das Wellenband der abgestrahlten Energie, insbesondere deren Höchstwert, nach längeren Wellenlängen hin verschieben kann, für die die zu erwärmenden Körper eine für die Temperaturreglung eventuell erwünschte höhere oder geringere Absorptionsfähigkeit aufweisen. Mit allen diesen verschiedenen Mitteln ist es dann immer möglich, auch bei sehr rasch wechselnden Schweißgeschwindiglçeiten einwandfreie Vefbindungen herzustellen. Im gleichen Sinne wirkt es sich bei derartigen Arbeiten günstig aus, daß die Infrarotstrahlen die Materialien nicht nur an ihrer Oberfläche erwärmen, so daß unerwünschte örtliche Überhitzungen vermieden werden. In contrast to heating by hot air or by a soldering iron Infrared radiators can be used in a simple manner depending on the heating wedge Regulate the welding and transport speed so that it is exceeded or not reached the target temperature cannot occur. Are z. B. when working in a continuous process several infrared emitters are provided in series one behind the other along the weld seam, in order to gradually heat them up accordingly, the Activation and deactivation of individual lamps to keep the temperature of the weld metal in the influence the desired direction. The same purpose can also be adjustable Apertures, e.g. B. iris diaphragms, slit diaphragms or the like., Before the emitters or changes the voltage applied to these radiators. It is of particular advantage in the latter case that with a lowering of the voltage not only the temperature maximum sinks, but at the same time the waveband of the radiated energy, in particular its maximum value can shift towards longer wavelengths, for which the body to be heated is one that may be desired for temperature control have higher or lower absorbency. With all of these different Averaging is then always possible, even with very rapidly changing welding speeds to make perfect connections. It works in the same way with such Working favorably out that the infrared rays not only affect the materials Heat the surface so that undesired local overheating is avoided.
Die so gekennzeichneten Verfahren sind mit den verschiedensten Einrichtungen durchzuführen, von denen in Weiterbildung der Erfindung vor allem solche den Vorzug verdienen, die es gestatten, die z. B. von einer punkt- oder stabförmigen Energiequelle ausgehenden Strahlen durch besondere Ausbildung ihrer Reflektoren und gegebenenfalls unter Zwischenschaltung entsprechender Linsen den Schweißstellen konzentriert zuzuführen. Einige bei sonders zweckmäßige Ausführungsformen mit weiteuren, Einzelheiten der Erfindung seien im folgenden an Hand der Zeichnung beispielsweise erläutert, in der Fig. I eine Infrarotschweißeinrichtung mit parabelförmigem Reflektor und diesem vorgeschalteter Sammellinse sowie Fig. 2 bis 4 drei verschiedene entsprechende Einrichtungen mit Ellipsoidreflektoren darstellen. The procedures marked in this way are with the most diverse facilities perform, of which in a further development of the invention, especially those preferred earn who allow the z. B. from a point or rod-shaped energy source outgoing rays through special training of their reflectors and, if necessary with the interposition of appropriate lenses to be fed to the welding points in a concentrated manner. Some particularly useful embodiments with extensive details of the Invention are explained below with reference to the drawing, for example, in Fig. I an infrared welding device with a parabolic reflector and this upstream converging lens and FIGS. 2 to 4 three different corresponding devices represent with ellipsoid reflectors.
Die gemäß der Erfindung unter Verwendung von Infrarotstrahlen zu verschweißenden Teile, beispielsweise zwei Kunststoffolien I, 2, werden bei dem Ausführungsbeispiel nach Fig. I senkrecht zur Zeichenebene zwischen zwei Strahlern 3, 4 vorbeigeführt, die ihrerseits im Brennpunkt je eines parabelförmigen Reflektors 5, 6 sitzen. Vor den Austrittsöffnungen dieser Reflektoren sind weiterhin vorzugsweise plankonvexe Sammellinsen7, 8 angeordnet, deren Brennpunkt möglichst nahe der Schweißnaht der beiden Kunststoffolien liegen soll, um so an dieser Stelle eine weitgehende Konzentration der zunächst durch den Reflektor parallel gebündelten Infrarotstrahlen zu erzielen. According to the invention using infrared rays welding parts, for example two plastic films I, 2, are in the Embodiment according to FIG. I perpendicular to the plane of the drawing between two radiators 3, 4 passed, which in turn are each at the focal point of a parabolic reflector 5, 6 sit. In front of the exit openings of these reflectors are also preferred Plano-convex converging lenses 7, 8 are arranged, the focus of which is as close as possible to the weld seam of the two plastic foils should be, a far-reaching one at this point Concentration of the infrared rays that are initially bundled in parallel by the reflector to achieve.
Bei etwa punktförmiger Strahlenquelle wird man den Reflektor tunlichst als Rotationsparaboloid ausbilden und ihn durch eine sphärische Sammellinse abschließen, während für langgestreckte Stabstrahler Trogreflektoren angenähert parabelförmigen Querschnitts verwendet werden, denen dann zylindrische Sammellinsen vorzusetzen sind. Durch entsprechenden Schliff dieser Linsen läßt sich dabei in besonders vorteilhafter Weise die Nahtbreite festlegen. If the radiation source is approximately punctiform, the reflector will be used whenever possible train as a paraboloid of revolution and close it with a spherical converging lens, while for elongated rod radiators trough reflectors approximately parabolic Cross-section are used, which then have cylindrical converging lenses in front of them are. By appropriately grinding these lenses, this can be particularly advantageous Way to determine the seam width.
Nach Durchgang des Schweißgutes zwischen den beiden Strahlereinheitenf, denen sich selbstverständliQ je nach der zu erzielenden Endtemperatur beliebig viele weitere Strahlerpaare anschließen können, ist es darauf möglich, die beiden Kunststoffolien unmittelbar z. B. in einer nicht dargestellten Rotations- oder Stangenpresse endgültig zu einem einheitlichen Ganzen zu vereinigen. Falls jedoch durch die Infrarotstrahler lediglich eine Vorwärmung beabsichtigt ist, wird man an diesem Arbeitsgang noch eine weitere Erhitzungsstufe anschließen, zweckmäßig im Hochfrequenzfeld, deren z. B. als Rollen ausgebildete Elektroden dann gleichzeitig die abschließende Druckbehandlung übernehmen können. After the weld metal has passed between the two lamp units, which of course can be as many as desired, depending on the final temperature to be achieved can connect further pairs of radiators, it is possible to use the two plastic foils immediately z. B. in a rotary press or rod press, not shown, finally to unite into a unified whole. If, however, by the infrared heater If only preheating is intended, you will still need to do this at this stage connect another heating stage, expediently in the high-frequency field, whose z. B. formed as rollers electrodes then at the same time the final pressure treatment can take over.
Die Ausfülirungsformen nach den Fig. 2 bis 4 unterscheiden sich von der der Fig. I im wesentlichen dadurch, daß ihre Reflektoren g bzw. IO an Stelle eines parabelförmigen einen elliptischen Querschnitt aufweisen. Im übrigen liegen die Strahler 3 bzw. 4 wieder in einem Brennpunkt dieser Reflektoren,, während die Nahtstelle des Schweiß gutes selber möglichst nahe an dem anderen Reflektorbrennpurkt vorbeigeführt werden kann, so daß sich eine Zwischenschaltung von Linsen erübrigt. Doch mag es auch in diesem Falle zur genaueren Festlegung der Schweißnahtbreite zweckmäßig sein, bei Verwendung von stabförmigen Strahlern, die in entsprechend langgestreckten Trogreflektoren elliptischen Querschnitts eingebaut sind, in dem Strahlengang der an einem solchen Reflektor gespiegelten Strahlen kurz vor bzw. hinter dessen zweitem Brennpunkt eine zylindrische Zerstneuungs- bzw. Sammellinse in der Weise vorzusehen, daß die so entstehende strichförmige Abbildung der Strahlenquelle etwa in Richtung der Schweißnaht der zu verbindenden Körper liegt. The Ausfülirungsformen according to FIGS. 2 to 4 differ from that of FIG. I essentially in that its reflectors g and IO instead of of a parabolic have an elliptical cross section. Otherwise lie the radiators 3 and 4 again in a focal point of these reflectors ,, while the The seam of the sweat itself as close as possible to the other reflector focal point Can be moved past, so that an interposition of lenses is unnecessary. However, in this case too, it may be useful to determine the width of the weld seam more precisely be useful when using rod-shaped radiators, which in accordingly elongated trough reflectors are built into the elliptical cross-section Beam path of the beams reflected on such a reflector shortly before or behind its second focal point a cylindrical diffusing or converging lens to be provided in such a way that the resulting line-shaped image of the radiation source lies approximately in the direction of the weld of the body to be connected.
Ebenso ist es hei der Verwendung derartiger elliptischer Reflektoren wieder möglich, durch Hintereinanderschaltung mehrerer solcher Geräte die Erwärmung der Schweißnähte in jeder gewünschten Weise zu steigern oder sonstwie zu heeinflussen.The same applies to the use of such elliptical reflectors again possible, by connecting several such devices in series, the heating to increase or otherwise influence the weld seams in any desired way.
Im einzelnen zeigt Fig. 2 einen als Rotationsellipsoid ausgebildeten Reflektor g mit abgeschnittener unterer Kappe, dessen oberer Brennpunkt eine etwa punktförmige Infrarotstrahlenquelle 3 enthält. Die von zwei Seiten dem unteren Brennpunkt dieses Ellipsoids in Pfeilrichtung zugeführten beiden Kunststoffolien I,2 werden anschließend von zwei Rollen In, 12, die gleichzeitig als Druckglied und Hochfrequenzkondensator-Elektroden dienen können, erfaßt, worauf alsdann der fertig verschweißte Körper die Vorrichtung verläßt. In detail, FIG. 2 shows an ellipsoid of revolution Reflector g with the lower cap cut off, the upper focal point of which is approximately Contains point-shaped infrared radiation source 3. The lower focal point from two sides of this ellipsoid in the direction of the arrow are fed to the two plastic films I, 2 then by two rollers In, 12, which simultaneously act as a pressure member and high-frequency capacitor electrodes can serve, whereupon the finished welded body then the device leaves.
Bei der in Fig. 3 wiedergegebenen nächsten Ausführungsform einer Infrarotschweiß einrichtung nach dieser Erfindung besteht dessen Reflektor 9 vorzugsweise aus einem Trog mit elliptischem Querschnitt, in dessen einer Brennlinie ein stabförmiger Strahler 3 liegt und durch dessen andere Brennlinie die Schweißnaht der zu verbindenden Folien I, 2 läuft. Wie aus dem gestrichelt eingezeichneten Verlauf der reflektierten Strahlen zu erkennen ist, werden auf diese Weise beide Teile des Schweißgutes von den Strahlen durchdrungen, so daß auch die nähere Umgebung der Schweißnaht eine für ihre Haltbarkeit günstige Aufheizung erfährt. Die weiterhin am Austrittsende des Reflektortroges vorgesehenen Walzenpaare in, 12 können dann wieder als Andrückrollen und erforderlichen- -falls auch als Kondensatorelektroden arbeiten. In the case of the next embodiment shown in FIG Infrared welding device according to this invention, the reflector 9 is preferably from a trough with an elliptical cross-section, in one of the focal lines a rod-shaped one Radiator 3 is and through its other focal line the weld to be connected Foils I, 2 is running. As shown in the dashed curve of the reflected Rays can be seen, in this way both parts of the weld metal are of penetrated by the rays, so that the vicinity of the weld seam a experiences favorable heating for their durability. Which continues at the exit end of the reflector trough provided roller pairs in 12, 12 can then again as pressure rollers and if necessary also work as capacitor electrodes.
Einen ähnlichen Aufbau weist die Einrichtung nach Fig. 4 auf, bei der zwei Halbschalen 9, IO eines Rotationsellipsoids das etwa in deren jeweiligen Längsachse verlaufende Schweißgut I, 2 umfassen. Diese Halbschalen sind so ausgebildet, daß jeweils ihr einer eine punktförmige Strahlenquelle 3 bzw. 4 aufnehmender Brennpunkt in verhältnismäßig geringer Entfernung von den Folien liegt, während sich ihre beiden anderen Brennpunkte in der Schweißnaht, und zwar bei dem in der Zeichnung wiedergegebenen Ausführungsbeispiel an ein und derselben Stelle treffen. Die Folien werden daher auf ihrem Wege durch das Gerät zunächst von der den Reflektoren abgewandten Seite der Strahler 3 und 4 vorgewärmt und anschließend erst im zweiten Brennpunkt von den dort vereinigten reflektierten Strahlen auf die gewünschte Endtemperatur aufgeheizt, worauf sie dann wieder einem Walzenpaar In, 12 zugeführt werden. Dieses Walzenpaar kann dabei, wie dargestellt, außerhalh des Reflektors angeordnet sein. Es ist aber auch ohne weiteres möglich, es unmittelbar hinter dem zweiten Brennpunkt innerhalb des Gerätes selbst vorzusehen. The device according to FIG. 4 has a similar structure of the two half-shells 9, IO of an ellipsoid of revolution roughly in their respective Weld metal I, 2 extending along the longitudinal axis. These half-shells are designed in such a way that that in each case one of a point radiation source 3 or 4 receiving focal point at a relatively short distance from the foils, while the two of them other focal points in the weld, namely at the one shown in the drawing Embodiment meet in one and the same place. The foils are therefore on their way through the device initially from the side facing away from the reflectors the radiators 3 and 4 are preheated and then only in the second focal point of the reflected rays combined there are heated to the desired final temperature, whereupon they are fed back to a pair of rollers In, 12. This pair of rollers can, as shown, be arranged outside the reflector. But it is also easily possible, it immediately behind the second focal point within of the device itself.
Claims (8)
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DES21834A DE938499C (en) | 1951-02-13 | 1951-02-13 | Process and devices for the dielectric production of welded joints between several plastic bodies when using adjustable preheating by means of infrared radiators |
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DES21834A DE938499C (en) | 1951-02-13 | 1951-02-13 | Process and devices for the dielectric production of welded joints between several plastic bodies when using adjustable preheating by means of infrared radiators |
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Cited By (16)
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US2927187A (en) * | 1957-12-30 | 1960-03-01 | Waltham Prec Instr Company Inc | High intensity electrical radiation or multi-element image furnace |
DE1151369B (en) * | 1960-04-21 | 1963-07-11 | Koerting Radio Werke G M B H | Device for the production of tubular tubes, containers, packaging etc. from an endless thermoplastic plastic tube by high-frequency welding |
US3230338A (en) * | 1962-07-02 | 1966-01-18 | Ibm | Selective heating apparatus |
US3578936A (en) * | 1968-04-23 | 1971-05-18 | Continental Can Co | Container body separation utilizing radiation discrimination |
US3659332A (en) * | 1969-05-05 | 1972-05-02 | Spectra Instr Inc | Method of preparing electrical cables for soldering |
US3695498A (en) * | 1970-08-26 | 1972-10-03 | Ppg Industries Inc | Non-contact thermal cutting |
US4108108A (en) * | 1974-07-10 | 1978-08-22 | Schladitz-Whiskers Ag. | Apparatus for metallizing strips, sheets or the like |
US4188519A (en) * | 1978-03-20 | 1980-02-12 | Pyreflex Corporation | Process and apparatus for controllably exchanging heat between two bodies |
EP0200329A1 (en) * | 1985-03-20 | 1986-11-05 | Alethea Rosalind Melanie Hall | Method of joining sheets of a non-magnetic material together |
EP0427793A1 (en) * | 1988-07-28 | 1991-05-22 | SWARTZ, Henry D. | Bonding of plastic and plastic matrix composite materials |
FR2669412A1 (en) * | 1990-11-16 | 1992-05-22 | Dubuit Jean Louis | Ultra-violet radiation drying enclosure |
US5151149A (en) * | 1988-07-28 | 1992-09-29 | The Entwistle Corporation | Apparatus for bonding or melt fusing plastic and plastic matrix composite materials |
US5204534A (en) * | 1990-11-07 | 1993-04-20 | Dubuit Jean Louis | Ultraviolet radiation drying oven and drying enclosure thereof |
EP1024085A2 (en) * | 1999-01-29 | 2000-08-02 | SIG Pack Systems AG | Apparatus for sealing sheets, especially for sealing packaging sheets in a packaging machine |
WO2001073362A1 (en) * | 2000-03-27 | 2001-10-04 | Dr. Hönle AG | Uv irradiation device with an essentially closed reflector, in particular for the hardening of uv sensitive adhesives |
US6345149B1 (en) * | 1999-10-27 | 2002-02-05 | Fusion Uv Systems, Inc. | UV oven for curing magnet wire coatings |
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Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2927187A (en) * | 1957-12-30 | 1960-03-01 | Waltham Prec Instr Company Inc | High intensity electrical radiation or multi-element image furnace |
DE1151369B (en) * | 1960-04-21 | 1963-07-11 | Koerting Radio Werke G M B H | Device for the production of tubular tubes, containers, packaging etc. from an endless thermoplastic plastic tube by high-frequency welding |
US3230338A (en) * | 1962-07-02 | 1966-01-18 | Ibm | Selective heating apparatus |
US3283124A (en) * | 1962-07-02 | 1966-11-01 | Ibm | Selective heating apparatus |
US3578936A (en) * | 1968-04-23 | 1971-05-18 | Continental Can Co | Container body separation utilizing radiation discrimination |
US3659332A (en) * | 1969-05-05 | 1972-05-02 | Spectra Instr Inc | Method of preparing electrical cables for soldering |
US3695498A (en) * | 1970-08-26 | 1972-10-03 | Ppg Industries Inc | Non-contact thermal cutting |
US4108108A (en) * | 1974-07-10 | 1978-08-22 | Schladitz-Whiskers Ag. | Apparatus for metallizing strips, sheets or the like |
US4188519A (en) * | 1978-03-20 | 1980-02-12 | Pyreflex Corporation | Process and apparatus for controllably exchanging heat between two bodies |
EP0200329A1 (en) * | 1985-03-20 | 1986-11-05 | Alethea Rosalind Melanie Hall | Method of joining sheets of a non-magnetic material together |
EP0427793A1 (en) * | 1988-07-28 | 1991-05-22 | SWARTZ, Henry D. | Bonding of plastic and plastic matrix composite materials |
EP0427793A4 (en) * | 1988-07-28 | 1992-01-15 | Henry D. Swartz | Bonding of plastic and plastic matrix composite materials |
US5151149A (en) * | 1988-07-28 | 1992-09-29 | The Entwistle Corporation | Apparatus for bonding or melt fusing plastic and plastic matrix composite materials |
US5286327A (en) * | 1988-07-28 | 1994-02-15 | The Entwistle Corporation | Method and apparatus for bonding or melt fusing plastic matrix composite materials |
US5204534A (en) * | 1990-11-07 | 1993-04-20 | Dubuit Jean Louis | Ultraviolet radiation drying oven and drying enclosure thereof |
FR2669412A1 (en) * | 1990-11-16 | 1992-05-22 | Dubuit Jean Louis | Ultra-violet radiation drying enclosure |
EP1024085A2 (en) * | 1999-01-29 | 2000-08-02 | SIG Pack Systems AG | Apparatus for sealing sheets, especially for sealing packaging sheets in a packaging machine |
EP1024085A3 (en) * | 1999-01-29 | 2002-01-23 | SIG Pack Systems AG | Apparatus for sealing sheets, especially for sealing packaging sheets in a packaging machine |
US6345149B1 (en) * | 1999-10-27 | 2002-02-05 | Fusion Uv Systems, Inc. | UV oven for curing magnet wire coatings |
WO2001073362A1 (en) * | 2000-03-27 | 2001-10-04 | Dr. Hönle AG | Uv irradiation device with an essentially closed reflector, in particular for the hardening of uv sensitive adhesives |
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