DE29717783U1 - Welding element - Google Patents
Welding elementInfo
- Publication number
- DE29717783U1 DE29717783U1 DE29717783U DE29717783U DE29717783U1 DE 29717783 U1 DE29717783 U1 DE 29717783U1 DE 29717783 U DE29717783 U DE 29717783U DE 29717783 U DE29717783 U DE 29717783U DE 29717783 U1 DE29717783 U1 DE 29717783U1
- Authority
- DE
- Germany
- Prior art keywords
- heating band
- welding element
- element according
- welding
- wire
- 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 - Lifetime
Links
- 238000003466 welding Methods 0.000 title claims description 52
- 238000010438 heat treatment Methods 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 230000001788 irregular Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229920001169 thermoplastic Polymers 0.000 claims description 6
- 239000004416 thermosoftening plastic Substances 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 3
- 229920006255 plastic film Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
- 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
- B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
-
- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/38—Impulse heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
- B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
- B29C65/7433—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
-
- 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
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
- B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Capacitors (AREA)
- Surgical Instruments (AREA)
Description
• * III·• * III·
K0495/VIIIK0495/VIII
Joisten & Kettenbaum GmbH & Co. KGJoisten & Kettenbaum GmbH & Co. KG
Asselborner Weg 14-16, D-51429 Bergisch-GladbachAsselborner Weg 14-16, D-51429 Bergisch-Gladbach
SchweißelementWelding element
Die vorliegende Erfindung betrifft ein Schweißelement, mit einem aus einem Widerstandswerkstoff bestehenden, insbesondere eine unregelmäßige und/oder gekrümmte Form aufweisenden, Formheizband, zum Schweißen thermoplastischer Kunststoffe nach dem Warmeimpulsverfahren.The present invention relates to a welding element with a form heating band made of a resistance material, in particular having an irregular and/or curved shape, for welding thermoplastics using the heat pulse method.
Das Wärmeimpulsverfahren dient zum Verbindungsschweißen insbesondere von Kunststoffolien unter gleichzeitiger Anwendung von Wärme und Druck. Das Schweißen erfolgt dabei innerhalb des thermoplastischen Temperaturbereichs der Kunststoffe an den Berührungsflächen der zu verbindenden Teile, wobei unter Druck die durch Erwärmung freibeweglichen Molekülketten unter Verknäulung ineinander fließen. Die Wärme, deren Betrag sich entsprechend dem Jouleschen Gesetz ergibt und der demzufolge proportional zum spezifischen elektrischen Widerstand des Widerstandswerkstoffes ist, entsteht dabei durch einen kurzzeitig durch das Schweißelement fließenden Strom.The heat pulse method is used for welding joints, in particular plastic films, using heat and pressure at the same time. The welding takes place within the thermoplastic temperature range of the plastics on the contact surfaces of the parts to be joined, whereby the molecular chains, which are freely movable due to heating, flow into one another under pressure and become entangled. The heat, the amount of which is determined according to Joule's law and is therefore proportional to the specific electrical resistance of the resistance material, is generated by a current flowing briefly through the welding element.
Die beim Warmeimpulsverfahren als Schweißelemente verwendeten Heizbänder und Heizdrähte können z.B. in bekannten, pneumatisch gesteuerten Schweißpressen zum Einsatz gelangen. In einer solchen Schweißpresse wird der Schweißvorgang mit einem Fußschalter ausgelöst. Die SchweißpresseThe heating bands and heating wires used as welding elements in the heat pulse process can be used, for example, in well-known, pneumatically controlled welding presses. In such a welding press, the welding process is triggered with a foot switch. The welding press
besitzt einen Impulsgeber für den Strom, mit dem sich die Schweißzeit einstellen läßt. Diese richtet sich nach dem verwendeten Schweißelement und wird in ihrer Gesamtdauer durch den Andruckvorgang bestimmt, der etwa 0,5 - 5,0 s dauern kann. Zum behutsamen Schließen und Öffnen der Schweißwerkzeuge kann dabei eine einstellbare Luftdämpfung vorgesehen sein.has a pulse generator for the current, with which the welding time can be set. This depends on the welding element used and its total duration is determined by the pressure process, which can last around 0.5 - 5.0 s. An adjustable air damper can be provided for the careful closing and opening of the welding tools.
Mit einer solchen Schweißpresse lassen sich insbesondere Sonderschweißaufgaben, wie die Herstellung von Formteilen, wie z.B. Beuteln, Taschen, Schutzhüllen, Flaschen u.a. mit einer unregelmäßigen und/oder gekrümmten Form der Schweißnaht, ausgezeichnet lösen, da die Schweißpresse mit Heizbändern unterschiedlichster Formen ausgerüstet werden kann. Nahezu sämtliche thermoplastischen Folien, wie Polyethylen, Polypropylen, Polyamid, Polyvinylchlorid etc., lassen sich problemlos verschweißen. Darin besteht ein wesentlicher Vorteil gegenüber dem dielektrischen Hochfrequenzschweißen, dessen Einsatzbereich insofern bedeutend eingeengt ist, als sich dieses Verfahren nur für Kunststoffe eignet, deren Moleküle, wie z.B. bei PVC, einen polaren Charakter besitzen. Nach dem Wärmeimpulsverfahren können Verschweißungen von Mono- sowie von Verbundfolien vorgenommen werden.Such a welding press is particularly suitable for special welding tasks, such as the production of molded parts, such as bags, pouches, protective covers, bottles, etc. with an irregular and/or curved shape of the weld seam, as the welding press can be equipped with heating bands of a wide variety of shapes. Almost all thermoplastic films, such as polyethylene, polypropylene, polyamide, polyvinyl chloride, etc., can be welded without any problems. This is a major advantage over dielectric high-frequency welding, whose area of application is significantly limited in that this process is only suitable for plastics whose molecules, such as PVC, have a polar character. Mono- and composite films can be welded using the heat pulse process.
Die Herstellung des Kunststofformteile im Wärmeimpulsverfahren erfordert jedoch nachteiligerweise die Herstellung der Schweißnaht in einem ersten Arbeitsgang und in einem zweiten Arbeitsgang die Heraustrennung der endgültigen Form mit z.B. einem Bandstahlschnittwerkzeug.The production of plastic molded parts using the heat pulse process disadvantageously requires the production of the weld seam in a first step and the cutting out of the final shape in a second step using, for example, a steel strip cutting tool.
Eine Fertigung der beschriebenen Formteile in einem Arbeitsgang ist somit bekanntermaßen nur nach den auf-As is well known, the production of the described molded parts in one operation is only possible according to the
wendigeren Verfahren der Hochfrequenz- und Ultraschall-Schweißung oder bei der Erzeugung gerader Schweißnähte möglich. Im letzteren Fall kann, beispielsweise in einem Rollennahtschweißkopf, beim kontinuierlichen Durchführen zweier zu verschweißender Folienbahnen durch ein mit Heizelementen versehenes Walzenpaar eine Trennschneide, z.B. in Form einer an einer Walze befindlichen Sicke, vorgesehen sein. Eine solche technische Maßnahme ist jedoch bei dem oben beschriebenen, taktweise erfolgenden Schweißprozeß nicht möglich.more agile methods of high frequency and ultrasonic welding or when producing straight weld seams. In the latter case, for example in a roller seam welding head, a cutting edge, e.g. in the form of a bead on a roller, can be provided when two film webs to be welded are continuously fed through a pair of rollers equipped with heating elements. However, such a technical measure is not possible with the cyclic welding process described above.
Der Erfindung liegt die Aufgabe zugrunde, ein Schweißeletnent der eingangs beschriebenen Art herzustellen, mit dem eine möglichst aufwandsarme und damit kostengünstige Vereinfachung des Herstellungsprozesses von Formteilen aus Kunststoffolien erreicht werden kann, welche Schweißnähte aufweisen, die eine unregelmäßige und/oder gekrümmte Form besitzen. Weiterhin liegt der Erfindung die Aufgabe zugrunde, unter Anwendung des Wärmeimpulsschweißens einen solchermaßen vorteilhaften Herstellungsprozeß der genannten Kunststofformteile anzubieten.The invention is based on the object of producing a welding element of the type described at the beginning, with which the manufacturing process of molded parts made of plastic films, which have weld seams that have an irregular and/or curved shape, can be simplified as little as possible and thus as inexpensively as possible. The invention is also based on the object of offering such an advantageous manufacturing process for the aforementioned plastic molded parts using thermal impulse welding.
ErfindungsgemäS wird dies durch ein Schweißelement der eingangs beschriebenen Art erreicht, bei dem das Formheizband aus einem lasergeschnittenen Widerstandswerkstoff besteht und einseitig mit einem einen Trenngrat bildenden Draht aus einem Widerstandswerkstoff stoffschlüssig verbunden ist.According to the invention, this is achieved by a welding element of the type described above, in which the form heating band consists of a laser-cut resistance material and is integrally connected on one side to a wire made of a resistance material that forms a separating ridge.
Auf diese Weise entsteht ein "Form-Trennheizband", d.h. ein Heizband, mit dem nach dem erfindungsgemäßen Verfahren gleichzeitig sowohl der Arbeitsgang des Schweißens einer Formnaht als auch der Arbeitsgang des Abtrennens der Negativform eines nach dem Wärmeimpuls-SchweißverfahrenIn this way, a "mold separation heating band" is created, i.e. a heating band with which, according to the method according to the invention, both the operation of welding a mold seam and the operation of separating the negative mold of a
herstellbaren Erzeugnisses durchgeführt werden kann.manufacturable product can be carried out.
Das erfindungsgemäße "Form-Trennheizband" ist in einfacher Weise herstellbar, weist aber vorteilhafterweise über seine gesamte Länge eine große Konstanz seiner, vom werkstofftechnischen Standpunkt her relevanten Eigenschaften, insbesondere seines elektrischen Widerstandes, auf. Damit ist im Herstellungsprozeß der Kunststofformteile sowohl die Ausführung einer den Qualitätsanforderungen angemessenen Schweißnaht als auch eine der Nahtkontur entsprechende saubere Trennkante gewährleistet.The "mold separation heating band" according to the invention can be manufactured in a simple manner, but advantageously has a high degree of constancy over its entire length in its properties relevant from a material technology point of view, in particular its electrical resistance. This ensures that in the manufacturing process of the plastic molded parts both the execution of a weld seam that meets the quality requirements and a clean separation edge that corresponds to the seam contour is achieved.
Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung sind in den Unteransprüchen sowie der folgenden Beschreibung enthalten.Further advantageous design features of the invention are contained in the subclaims and the following description.
Anhand eines in der Zeichnung dargestellten, bevorzugten Ausführungsbeispiels soll im folgenden die Erfindung näher erläutert werden. Dabei zeigen:The invention will be explained in more detail below using a preferred embodiment shown in the drawing. In the drawing:
Fig. 1 eine Draufsicht eines erfindungsgemäßen Heizelementes ,Fig. 1 is a plan view of a heating element according to the invention ,
Fig. 2 in vergrößertem Maßstab, eine entlang der Linie II-II in Fig. 1 geschnittene Darstellung des erfindungsgemäßen Schweißelementes.Fig. 2 on an enlarged scale, a sectional view of the welding element according to the invention taken along the line II-II in Fig. 1.
In den verschiedenen Figuren der Zeichnung sind gleiche Teile mit denselben Bezugszeichen versehen, so daß sie in der Regel auch jeweils nur einmal beschrieben werden.In the various figures of the drawing, identical parts are provided with the same reference symbols, so that they are usually only described once.
Wie die Fig. 1 und 2 zeigen, besitzt ein erfindungsgemäßes Schweißelement zum Schweißen thermoplastischer KunststoffeAs shown in Fig. 1 and 2, a welding element according to the invention for welding thermoplastics
nach dem Wärmeimpulsverfahren ein aus einem Widerstandswerkstoff bestehendes Formheizband 1. Das Formheizband 1 weist eine gekrümmte Form, insbesondere eine U-Form, auf. Daraus ist ersichtlich, daß ein erfindungsgemäßes Schweißelement sich insbesondere zur Herstellung von Schweißnähten mit einer unregelmäßigen, wie z.B. polygonalen, und/oder mit einer gekrümmten Form eignet.according to the heat pulse method, a shaped heating band 1 made of a resistance material. The shaped heating band 1 has a curved shape, in particular a U-shape. It can be seen from this that a welding element according to the invention is particularly suitable for producing weld seams with an irregular, such as polygonal, and/or curved shape.
Das erfindungsgemäße Formheizband 1 besteht aus einem vorzugsweise lasergeschnittenen Widerstandswerkstoff und ist einseitig mit einem einen Trenngrat bildenden Draht 2 aus einem Widerstandswerkstoff stoffschlüssig verbunden.The molded heating band 1 according to the invention consists of a preferably laser-cut resistance material and is integrally connected on one side to a wire 2 made of a resistance material that forms a separating ridge.
Im Sinne einer angestrebten hohen Homogenität der Eigenschaften des Formheizbandes 1 ist es dabei insbesondere von Vorteil, wenn der Draht 2 vorzugsweise aus dem gleichen Werkstoff wie das Formheizband 1 besteht.In order to achieve a high degree of homogeneity in the properties of the mold heating band 1, it is particularly advantageous if the wire 2 is preferably made of the same material as the mold heating band 1.
Der Widerstandswerkstoff erfüllt die Funktion eines Heizleiters und muß daher einen hochohmigen Widerstand und großen Temperaturkoeffizienten aufweisen. Derartige Anforderungen werden beispielsweise von Eisen-, Nickel- und Chrom-Nickel-Legierungen erfüllt. Insbesondere können sowohl der Draht 2 als auch das Formheizband 1 aus Stahl, vorzugsweise aus einem Chromstahl, bestehen.The resistance material fulfills the function of a heating conductor and must therefore have a high resistance and a large temperature coefficient. Such requirements are met, for example, by iron, nickel and chromium-nickel alloys. In particular, both the wire 2 and the mold heating band 1 can be made of steel, preferably chromium steel.
Das Formheizband 1 kann beispielsweise aus etwa 0,25 mm dickem Bandstahl mittels Laser ausgeschnitten werden. Die Dicke 3 des Formheizbandes 1, die sowohl auf die Festigkeit als auch auf den elektrischen Widerstand Einfluß hat, kann dabei in bestimmten Grenzen variieren, wobei eine Dicke 3 im Bereich von etwa 0,1 bis 0,4 mm als optimal anzusehen ist. Die Breite 4 des Formheizbandes 1 kann im Bereich vonThe mold heating band 1 can, for example, be cut out of approximately 0.25 mm thick strip steel using a laser. The thickness 3 of the mold heating band 1, which influences both the strength and the electrical resistance, can vary within certain limits, whereby a thickness 3 in the range of approximately 0.1 to 0.4 mm is considered optimal. The width 4 of the mold heating band 1 can be in the range of
etwa 2 bis 6 mm, vorzugsweise bei etwa 4 mm, liegen.about 2 to 6 mm, preferably about 4 mm.
Für die Laserbearbeitung kann mit Vorteil ein CO2-Laser mit Gasstrahltechnik eingesetzt werden. Es wäre aber auch möglich, einen Nd-YAG-Laser zu verwenden, der nur einen sehr kleinen Brennfleck erzeugt. Der Schneidvorgang wird durch eine exotherme Oxydationsreaktion des Widerstandswerkstoffes mit Sauerstoff unterstützt. Durch ein Aufblasen von Sauerstoff auf die mittels des Laserstrahls erhitzte Stelle können so bei kleinem Wärmeeintrag schmale Schnittfugen erzeugt werden. Eine für die Gebrauchseigenschaften des Schweißelements ungünstige Gefügebeeinflussung unterbleibt. Es können Schnittgeschwindigkeiten von etwa 1 m/min und mehr erreicht werden. Im Vergleich zur Fertigung des Formbandes 1 als Stanzteil wird eine verbesserte Kantenqualität erreicht, die keine Nachbearbeitung erfordert, und außerdem entfällt die Notwendigkeit der aufwendigen Herstellung einer Stanzform.For laser processing, a CO 2 laser with gas jet technology can be used to advantage. However, it would also be possible to use an Nd-YAG laser, which only produces a very small focal spot. The cutting process is supported by an exothermic oxidation reaction of the resistance material with oxygen. By blowing oxygen onto the area heated by the laser beam, narrow cutting gaps can be created with little heat input. An influence on the structure that is unfavorable for the performance properties of the welding element is avoided. Cutting speeds of around 1 m/min and more can be achieved. In comparison to the production of the forming strip 1 as a punched part, an improved edge quality is achieved that does not require any post-processing, and there is also no need for the complex production of a punching mold.
In einem zweiten Arbeitsgang wird der Draht 2, beispielsweise mit einem Durchmesser 5 von etwa 0,5 mm, mit dem Formband 1 stoffschlüssig verbunden, insbesondere auf das Formband 1 aufgeschweißt. Der Durchmesser 5 des Drahtes 2 kann auf die Beschaffenheit der zu verschweißenden Kunststoffolien, insbesondere auf die Foliendicke, derart abgestimmt werden, daß er die Folien trennt, ohne daß eine übermäßige Quetschung der erzeugten Schweißnaht erfolgt. Der optimale Bereich des Durchmessers 5 des Drahtes 2 liegt somit für die im allgemeinen am häufigsten auftretenden Bearbeitungsaufgaben bei etwa 0,2 bis 0,8 mm.In a second operation, the wire 2, for example with a diameter 5 of about 0.5 mm, is firmly bonded to the forming belt 1, in particular welded onto the forming belt 1. The diameter 5 of the wire 2 can be adjusted to the nature of the plastic films to be welded, in particular to the film thickness, in such a way that it separates the films without excessive crushing of the weld seam produced. The optimal range of the diameter 5 of the wire 2 is therefore about 0.2 to 0.8 mm for the processing tasks that generally occur most frequently.
Bezüglich des Verschweißens des Formheizbandes 1 mit dem Draht 2 und die Erwärmung des Schweißelementes beim Ge-Regarding the welding of the form heating band 1 with the wire 2 and the heating of the welding element during
brauch ist im Hinblick auf den Widerstandswerkstoff zu bemerken, daß insbesondere ferritische Chromstähle eine gute Schweißeignung besitzen, während wiederum bei martensitisch-ferritischen Chromstählen eine bessere Warmfestigkeit gegeben ist.With regard to the resistance material, it should be noted that ferritic chromium steels in particular have good weldability, while martensitic-ferritic chromium steels have better heat resistance.
Wie in der Zeichnung dargestellt ist, kann der Draht 2 mit dem Formheizband 1 insbesondere über im wesentlichen punkt- und/oder linsenförmige Kontaktstellen 6 verbunden sein, wie diese durch ein automatisierbares oder teilautomatisierbares Punktschweißen erzeugt werden können. Das Punktschweißen gestattet es, dadurch, daß eine Punktserie mit entsprechender Punktdichte erzeugt werden kann, nicht nur eine Heft- sondern vorteilhafterweise auch eine Festverbindung zwischen dem Formheizband 1 und dem Draht herzustellen. As shown in the drawing, the wire 2 can be connected to the form heating band 1 in particular via essentially point-shaped and/or lens-shaped contact points 6, as can be produced by automated or partially automated spot welding. The spot welding makes it possible to produce not only a tack connection but also, advantageously, a fixed connection between the form heating band 1 and the wire, because a series of points with a corresponding point density can be produced.
Der Draht 2 kann vorteilhafterweise mit dem Formheizband 1 so verbunden werden, daß sich der Draht 2 in der Mitte des Formheizbandes 1 zumindest über einen Teil von dessen Gesamtlänge erstreckt. Beim Verbinden von Draht 2 und Formheizband 1 ist es möglich, den Draht 2 entsprechend dem Verlauf des Formheizbandes 2 zu biegen, ohne daß dabei eine nennenswerte Veränderung des elektrischen Widerstandes des so entstandenen erfindungsgemäßen "Trenn-Formheizbandes" über dessen Länge zu verzeichnen ist.The wire 2 can advantageously be connected to the mold heating band 1 in such a way that the wire 2 extends in the middle of the mold heating band 1 over at least part of its total length. When connecting the wire 2 and the mold heating band 1, it is possible to bend the wire 2 according to the course of the mold heating band 2 without a significant change in the electrical resistance of the resulting "separating mold heating band" according to the invention being recorded over its length.
Das Formheizband 1 kann des weiteren Abschnitte aufweisen, die mit einer Schicht 7 eines Leiterwerkstoffes versehen sind; vornehmlich können seine Enden 8 verkupfert sein. Durch den dadurch abschnittsweise geringeren elektrischen Widerstand des Formheizbandes 1 tritt so, beispielsweise an den Einspannstellen (Enden 8) des Formheizbandes 1 in einerThe mold heating tape 1 can also have sections that are provided with a layer 7 of a conductor material; in particular, its ends 8 can be copper-plated. Due to the resulting lower electrical resistance of the mold heating tape 1 in certain sections, for example at the clamping points (ends 8) of the mold heating tape 1 in a
Schweißpresse, beim Betrieb eine geringere Erwärmung auf.Welding press, generates less heat during operation.
Mit dem erfindungsgemäßen Schweißelement, das wie vorstehend aufgezeigt wurde, mit vergleichsweise geringem Aufwand herstellbar ist, können unter Einsatz des Schweißens thermoplastischer Kunststoffe nach dem - im Vergleich mit den kostenintensiven Hochfrequenz- und Ultraschallschweißverfahren - äußerst günstigen Warmeimpulsverfahren Formteile hergestellt werden, bei denen die zu erzeugenden Schweißnähte insbesondere eine unregelmäßige und/oder gekrümmte Form aufweisen. Das Verschweißen der Kunststoffe kann gleichzeitig mit der Heraustrennung der endgültigen Form des Formteils erfolgen kann.With the welding element according to the invention, which as shown above can be produced with comparatively little effort, molded parts can be produced using the welding of thermoplastics using the - in comparison with the cost-intensive high-frequency and ultrasonic welding processes - extremely inexpensive heat pulse process, in which the weld seams to be produced have in particular an irregular and/or curved shape. The welding of the plastics can take place at the same time as the final shape of the molded part is removed.
Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt, sondern umfaßt auch alle im Sinne der Erfindung gleichwirkenden Ausführungen. Insbesondere fällt es beispielsweise in den Rahmen der Erfindung, wenn das Formheizband 1 über eine Lot- oder eine elektrisch leitfähige Klebeverbindung mit dem Draht verbunden ist. Ferner ist die Erfindung bislang noch nicht auf die im Anspruch 1 definierte Merkmalskombination beschränkt, sondern kann auch durch jede beliebige andere Kombination von bestimmten Merkmalen aller insgesamt offenbarten Einzelmerkmale definiert sein. Dies bedeutet, daß grundsätzlich praktisch jedes Einzelmerkmal des Anspruchs 1 weggelassen bzw. durch mindestens ein an anderer Stelle der Anmeldung offenbartes Einzelmerkmal ersetzt werden kann. Insofern ist der Anspruch 1 lediglich als ein erster Formulierungsversuch für eine Erfindung zu verstehen.The invention is not limited to the embodiment shown, but also includes all embodiments that have the same effect in the sense of the invention. In particular, it falls within the scope of the invention, for example, if the form heating band 1 is connected to the wire via a solder or an electrically conductive adhesive connection. Furthermore, the invention is not yet limited to the combination of features defined in claim 1, but can also be defined by any other combination of specific features of all the individual features disclosed overall. This means that in principle practically every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. In this respect, claim 1 is to be understood as merely a first attempt at formulating an invention.
1 Formheizband1 mold heating band
2 Draht2 wire
3 Dicke von 13 Thickness of 1
4 Breite von 14 width of 1
5 Durchmesser von5 diameters of
6 Kontaktstelle6 Contact point
7 Schicht auf7 layer on
8 Endabschnitt von8 End section of
Claims (11)
dadurch gekennzeichnet, daß sowohl der Draht (2) als auch das Formheizband (1) aus Stahl, vorzugsweise aus einem Chromstahl, besteht.6. Welding element according to one of claims 1 to 5,
characterized in that both the wire (2) and the mold heating band (1) consist of steel, preferably of a chromium steel.
dadurch gekennzeichnet, daß sich der Draht (2) in der Mitte des Formheizbandes (1) zumindest über einen Teil von dessen Gesamtlänge erstreckt .7. Welding element according to one of claims 1 to 6,
characterized in that the wire (2) extends in the middle of the mold heating band (1) over at least part of its total length.
dadurch gekennzeichnet, daß der Draht (2) einen Durchmesser (5) von etwa 0,2 bis 0,8 mm, vorzugsweise von etwa 0,5 mm, aufweist.8. Welding element according to one of claims 1 to 7,
characterized in that the wire (2) has a diameter (5) of about 0.2 to 0.8 mm, preferably about 0.5 mm.
dadurch gekennzeichnet, daß das Formheizband (1) eine Dicke (3) von etwa 0,1 bis 0,4 mm, vorzugsweise von etwa 0,25 mm, aufweist.9. Welding element according to one of claims 1 to 8,
characterized in that the mold heating band (1) has a thickness (3) of about 0.1 to 0.4 mm, preferably about 0.25 mm.
dadurch gekennzeichnet, daß das Formheizband (1) eine Breite (4) von etwa 2 bis 6 mm, vorzugsweise von etwa 4 mm, aufweist.10. Welding element according to one of claims 1 to 9,
characterized in that the mold heating band (1) has a width (4) of about 2 to 6 mm, preferably about 4 mm.
dadurch gekennzeichnet, daß das Formheizband (1) mit einer Schicht (7) eines Leiterwerkstoffes versehene Abschnitte, vorzugsweise verkupferte Enden (8), aufweist.11. Welding element according to one of claims 1 to 10,
characterized in that the mold heating band (1) has sections provided with a layer (7) of a conductor material, preferably copper-plated ends (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29717783U DE29717783U1 (en) | 1997-10-06 | 1997-10-06 | Welding element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29717783U DE29717783U1 (en) | 1997-10-06 | 1997-10-06 | Welding element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE29717783U1 true DE29717783U1 (en) | 1998-01-02 |
Family
ID=8046893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE29717783U Expired - Lifetime DE29717783U1 (en) | 1997-10-06 | 1997-10-06 | Welding element |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE29717783U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013210651A1 (en) | 2012-06-08 | 2013-12-12 | Otto-Von-Guericke-Universität Magdeburg Medizinische Fakultät | Welding device for welding e.g. high frequency magnetic field intervention coil into plastic cladding, has wire-shaped body comprising two terminals for connection with electric power source, where electrodes are connected with power source |
-
1997
- 1997-10-06 DE DE29717783U patent/DE29717783U1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013210651A1 (en) | 2012-06-08 | 2013-12-12 | Otto-Von-Guericke-Universität Magdeburg Medizinische Fakultät | Welding device for welding e.g. high frequency magnetic field intervention coil into plastic cladding, has wire-shaped body comprising two terminals for connection with electric power source, where electrodes are connected with power source |
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