DE2264047A1 - Mesh screen heating strip - for welding plastics - Google Patents

Mesh screen heating strip - for welding plastics

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Publication number
DE2264047A1
DE2264047A1 DE2264047A DE2264047A DE2264047A1 DE 2264047 A1 DE2264047 A1 DE 2264047A1 DE 2264047 A DE2264047 A DE 2264047A DE 2264047 A DE2264047 A DE 2264047A DE 2264047 A1 DE2264047 A1 DE 2264047A1
Authority
DE
Germany
Prior art keywords
grid
heat
heating
cover
conductor material
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
DE2264047A
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German (de)
Inventor
Elmar Dr Messerschmitt
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Individual
Original Assignee
Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to DE2264047A priority Critical patent/DE2264047A1/en
Publication of DE2264047A1 publication Critical patent/DE2264047A1/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
    • 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
    • B29C65/18—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
    • B29C65/223—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 comprising several heated wires
    • 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
    • B29C65/226—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular
    • 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
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or 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
    • 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
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/242—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 closed, i.e. forming closed contours
    • B29C66/2422—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 closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—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 closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/242—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 closed, i.e. forming closed contours
    • B29C66/2424—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 closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—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 closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—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 closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/306—Applying a mark during joining
    • B29C66/3062—Applying a mark during joining in the form of letters or numbers
    • B29C66/30621—Applying a mark during joining in the form of letters or numbers in the form of letters
    • 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
    • B29C66/81—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C65/229—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for tensioning said heated wire, resistive ribbon, resistive band or 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
    • B29C66/80—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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

Welding element, partic for heat pulse processing comprises a uniform mesh which is used as the heat conducting material, particularly a woven screen or a screen printed element. Pref. the screen is coated with a material of sufficient heat resistance e.g. silicone rubber on one or both faces.

Description

Schweißvorrichtung, insbesondere für Kunststoffe Es ist bekannt, ein Heizielter-Stahlband mit Strom zu beschicken und so zu erwärmen. Solche Bänder werden über einen Träger, meist federnd, gespannt. Mittels der so entstehenden Elektrode wird dann im sog. Wärmeimpulsverfahren, z.B. Kunststoff geschweißt.Welding device, especially for plastics It is known a To charge the heater steel strip with electricity and thus to heat it. Such tapes will be stretched over a carrier, usually springy. By means of the resulting electrode is then welded using the so-called heat pulse process, e.g. plastic.

Es ist auch bekannt, einzelne Drähte zu beheizen, z.B. in Schneidvorrichtungen oder Heizelementen. Zum schutz gegen Verbrennung oder Ankleben werden diese Heizkörper meist mit Teflon abgedeckt. Der Nachteil dieser Vorrichtungen liegt u.a.It is also known to heat individual wires, for example in cutting devices or heating elements. These radiators are used to protect against burning or sticking mostly covered with Teflon. The disadvantage of these devices is i.a.

darin, daß solche Elektroden eine absolut plane Basis erfordern.in that such electrodes require an absolutely flat base.

Es muß u.U. die Elektrode mit hohem Druck in den Kunststoff gepreßt werden, um überall Kontakt zu bekommen. Wird der Kontakt nicht an allen Stellen hergestellt, kann es zu Überhitzungen, d.h. zur Zerstörung der Elektrode oder des Schweißgutes kommen.It may be necessary to press the electrode into the plastic with high pressure to get in touch everywhere. Will not make contact in all places overheating, i.e. the destruction of the electrode or the Weld metal come.

Ein weiterer Nachteil dieser Elektroden ist, daß sie eine extrem hohe spezifische Wärme entwickeln, im Vergleich zur Breite der Schweißnaht gesehen. Dadurch ist ihr Anwendungsbereich sehr beschränkt, da hohe Wärmeentwicklung von vielen Kunststoffen nicht oder nur sehr kurze Zeit ohne Strukturschäden vertragen wird.Another disadvantage of these electrodes is that they are extremely high develop specific heat compared to the width of the weld seam. Through this their area of application is very limited, as many plastics generate a lot of heat is not tolerated or is only tolerated for a very short time without structural damage.

So entstehen vor allem in den 'Uandbereichen der Schweißung Qualitätsminderungen, wo plötzlich kristallines in amorphes Gefüge übergeht und damit bei mechanischer oder thermischer Belastung Bruchgefahr entsteht, Die erforderliche Abdeckung, meist aus Teflon, hat einen anderen Ausdehnungskoeffizienten als das Metallband, das sich bei Wärmeentwicklung relativ stark ausdehnt, weshalb es meist unter Federzug gespannt wird. Durch diesen Unterschied verschleißt die Abdeckung schnell.This results in quality reductions, especially in the areas of the weld, where suddenly a crystalline structure changes into an amorphous structure and thus a mechanical one or thermal stress risk of breakage arises, the required cover, mostly made of Teflon, has a different coefficient of expansion than the metal tape that is expands relatively strongly when heat is generated, which is why it is usually stretched under a spring tension will. Because of this difference, the cover wears out quickly.

Heizbänder der bekannten Art sind außerdem nur auf Träger spannbar, welche in einer Dimension eben und in der anderen ebenfalls plan oder konvex sind. Eine Formanpassung, insbes. konkav oder gar gewölbt ist in der Praxis nicht denkbar, weil der Querschnitt zur Erreichung einwandfreier Ergebnisse stets gleich gehalten werden muß. Da die bekannten Heizbänder gespannt werden, kann es also nur gradlinige Schweißnähte damit geben.Heating tapes of the known type can also only be tensioned on carriers, which are flat in one dimension and planar or convex in the other. An adaptation of the shape, especially concave or even arched, is not conceivable in practice, because the cross-section is always kept the same to achieve perfect results must become. Since the known heating tapes are stretched, it can only be done in a straight line Give welds with it.

Zur Behebung all dieser Mängel wird erfindungsgemäß vorgeschlagen, ein gitterförmiges Heizleitermaterial, (z.B. Gewebestreifen aus Heizleitermaterial, zu verwenden.To remedy all of these deficiencies, it is proposed according to the invention that a grid-shaped heating conductor material (e.g. fabric strips made of heating conductor material, to use.

Diese Gitterstreifen können vortrefflich in schützendes, hinreichend hitzefestes Material, z.B. Teflon, insbesondere aber Silikonkautschuk, eingebettet werden. Dadurch wird erreicht, dai je nach Querschnitt (Fadenstärke der Langsgitterlinien) des Gitters (Gewebe) eine mehr oder weniger starke spezifische Wärme der Heizfläche entsteht. Man bekommt eine sehr genau dosierbare Wärmeabgabe.#ei richtiger Stromdosierung ist das Band dauerbeheizbar. Die Abdeckung ist durch die Maschen des Gitters hindurch fest verankert. Das Gewebe ist in beiden Dimensionen sehr elastisch und anpassungsfähig. Diese wirkung wird verstärkt durch die Silikonkautschuk-Äuflage Trotz Verformung sind gleichbleibende Querschnitte sichergestellt, da die stromführenden Querschnitte (der Fäden) nicht beeinträchtigt werden. Die Maschenstruktur bewirkt im Gegensatz zu einzelnen Fäden einen gleichmäßigen Fluß von Strom und wärme.These grid strips can be excellent in protective, sufficient heat-resistant material, e.g. Teflon, but especially silicone rubber, embedded will. This ensures that, depending on the cross-section (thread thickness of the longitudinal lattice lines) of the grid (fabric) a more or less strong specific heat of the heating surface arises. You get a very precisely metered heat emission. # With correct current metering the tape can be heated continuously. The cover is through the mesh of the grid firmly anchored. The fabric is very elastic and adaptable in both dimensions. This effect is reinforced by the silicone rubber cover despite deformation constant cross-sections are ensured because the current-carrying cross-sections (of the threads) are not affected. The mesh structure causes in contrast a steady flow of electricity and heat to individual threads.

Die effektive Wärmeausdehnung ist wesentlich geringer als bei massivem Material; außerdem paßt sich der verankerte Silikongummi ihr gut an. The effective thermal expansion is much lower than with massive Material; in addition, the anchored silicone rubber adapts well to it.

Heizbänder der beschriebenen Art sind vielseitig variabel. Heating tapes of the type described can be varied in many ways.

Die Stärke der Fäden bestimmt ihre Heizleistung bei gleicher Fläche. Die Stärke der Auflage, z.B. aus Silikonkautschuk, die Oberflächenanpassung, die ärmevesteilung und die ärmedämmung, Die Wärmeverteilung und Wärmedämmung kann durch Einlagen in den Kautschuk verändert werden. The strength of the threads determines their heating capacity for the same area. The thickness of the pad, e.g. made of silicone rubber, the surface adaptation, the heat distribution and insulation, the heat distribution and insulation can through Deposits in the rubber can be changed.

Man wird vorzugsweise die Auflage gegenüber dem Scbweißgut dünn und gegenüber dem Träger stärker machen. an kann in die Auflage Kühlsysteme einarbeiten, welche nach Ablauf des Impulses das Schweißgut sowie die Abdeckung wieder abkühlen. The support is preferably thin and compared to the weld material make stronger towards the wearer. an can incorporate cooling systems into the overlay, which cool down the weld metal and the cover again after the pulse has expired.

Eine andere Lösung ist die Kombination von mEhreren Heizschichten neben und/oder übereinander, welche gleichzeitig oder verschieden lang erhitzt werden. Another solution is the combination of several heating layers next to and / or on top of each other, which are heated at the same time or for different lengths of time.

Das Heizgitter kann auch geformt, z.B. tiefgezogen oder mit einer Sicke versehen sein. Dabei kann die Abdeckung so gestaltet werden, daß nur erhabene Teile des Bandes als Schweißelement wirken, während die tiefergelegenen Teile in ihrer 'Virkung,zz.B. durch die Abdeckung abgedämmt sind. Solche Bänder ergeben einen sehr weichen Wärmeübergang an der Randzone, wie er z.B. zur Schweißung dünner Folien, etwa aus Polystyrol, unbedingt erforderlich ist und bisher nicht zur Verfügung stand. Durch die Einbettung ist der Wärmeabfluß vergleichmäßigt und für das Heizband schonend. The heating grid can also be shaped, e.g. deep-drawn or with a Be beaded. The cover can be designed so that only raised Parts of the band act as a welding element, while the deeper parts in their effect, e.g. are insulated by the cover. Such bands make one very soft heat transfer at the edge zone, e.g. for welding thin foils, made of polystyrene, for example, is absolutely necessary and has not previously been available. Due to the embedding, the heat flow is evened out and gentle on the heating tape.

In ähnlicher Weise läßt sich auch das bekannte Buckelschweiß--verfahren auf den Kunststoffsektor übertragen, indem das Heizband nur streckenweise oder punktweise in Schweißebene liegt, während die übrigen Zonen durch die Abdeckung abgedämmt werden. The well-known projection welding process can also be used in a similar manner Transferred to the plastics sector by applying the heating tape only in parts or at points lies in the welding plane, while the remaining zones are insulated by the cover.

Heizbänder der beschriebenen Art können um Körper herumgelegt werden, sie können in Hohlkörper angebracht werden, sie können vorzugsweise in Mehrlagenausführung zur Stumpf schweißung von Kunststoffen verwendet werden.Heating tapes of the type described can be placed around the body, they can be attached in hollow bodies, they can preferably be made in multiple layers can be used for butt welding plastics.

Sie müssen nicht nur bandförmig, sondern können ringförmig oder flächenförmig ausgebildet werden, wobei die Querschnittsregel leichter zu beherrschen ist als bei massiven Heizbändern, da die Wahl verschiedener Fadenstärken und die Maschenwirkung größere Variationsmöglichkeiten gibt.They not only have to be band-shaped, but can also be ring-shaped or flat-shaped be formed, the cross-section rule is easier to master than with massive heating tapes, because of the choice of different thread sizes and the mesh effect there are greater possibilities for variation.

Weitere Steuerung des Stromes ist möglich durch Einfügen oder Auflegen hochleitfähigen Metalls, z.B. von Silber-Fäden oder -Niederschlägen.Further control of the current is possible by inserting or hanging up highly conductive metal, e.g. from silver threads or precipitates.

Der Stromzufluß zur Heizzone wird vorteilhaft durch eine besser leitfähige Schicht, z.B. durch Aufgalvanisieren von Kupfer auf das Gitter bzw. Gewebe erleichtert. Die verkupferten Randstellen werden dann kaum thermisch belastet, wobei das Gitter sich wiederum bezüglich des Wärmeaustausches vorteilhafter auswirkt als massives Material.The current flow to the heating zone is advantageous through a more conductive one Layer, e.g. by electroplating copper on the grid or fabric. The copper-plated edge areas are then hardly thermally stressed, whereby the grid in turn has a more advantageous effect on heat exchange than massive Material.

Heizbänder der vorgeschlagenen Art müssen nicht gespannt werden.Heating tapes of the proposed type do not have to be tensioned.

Sie können auch auf eine Unterlage (welche gleichzeitig Kühlaggregat sein kann) geklebt oder sonst wie montiert werden.They can also be placed on a pad (which is also a cooling unit can be) glued or otherwise mounted.

Somit wird es möglich, das Impulsverfahren nicht nur wie bisher ausschließlich für geradlinige und ebene Schweißlinien zu verwenden.This makes it possible to use the impulse method not only as before to be used for straight and flat welding lines.

Es können figürlich und räumlich gekrümmte Schweißnähte beliebiger Breite gebildet werden. Umschweißungen werden durch das biegsame und anschmiegsame Heizband ebenfalls praktisch möglich, so daß Schweißungen über Eck, um Rundungen, trotz Toleranzen des Schweißgutes in Serie gelingen.It can be figuratively and spatially curved welds of any desired Width can be formed. Weldings are made by the flexible and supple Heating tape is also practically possible, so that welds around corners, around curves, succeed in series despite tolerances of the weld metal.

So führt das vorgeschlagene Heizband auch zu Lösungen für das rotative Schweißen. Da das vorgeschlagene Heizband ~stark gekrümmt werden kann, ist eine rundum-Schweißung praktisch möglich.So the proposed heating tape also leads to solutions for the rotary Welding. Since the proposed heating tape ~ can be severely curved, it is a all-round welding practically possible.

Abgesehen davon kann das Heizband auch überlappt, insbesondere unter Benutzung der vorerwähnten Zuflußverkupferung ohne thermische Nachteile benutzt werden.Apart from this, the heating tape can also overlap, in particular below Use of the aforementioned copper plating used without thermal disadvantages will.

Die Elastizität des vorgschlagenen Schweißbandes kann für die Serienarbeit noch anpassungsfähiger gemacht werden, indem die Auflage in Schlauchform oder geschäumt ausgebildet wird, so daß durch die pneumatische Wirkung extreme Unebenheiten der Schweißfläche ausgeglichen werden.The elasticity of the proposed sweatband can be used for serial work Can be made even more adaptable by the overlay in tubular form or foamed is formed so that extreme bumps of the Welding surface are compensated.

Die Vorteile des vorgeschlagenen Heizbandes sind auch für zungenförmige Elektroden nutzbar. Schweißungen des Gewebebandes können z.B. durch Plasma-Schweißung querschnittsunschädlich erfolgen, Es können auch gestanzte Gewebeteile verwendet werden.The advantages of the proposed heating tape are also for tongue-shaped Electrodes can be used. The fabric tape can be welded, for example, by plasma welding It is possible to use punched pieces of fabric will.

Die Herstellung der erfindungsgemäßen Heizbänder ist mit gewebten Gittern der verschiedensten Webarten möglich, insbesondere mit Leinenbindung. Kalandrierte Gewebe zeichnen sich durch besondere Gleichmäßigkeit aus.The production of the heating tapes according to the invention is woven with Lattices of the most varied types of weave are possible, especially with linen weave. Calendered Fabrics are characterized by their particular evenness.

Es ist eine ähnliche Wirkung zu erreichen mit galvanisch aufzebauten, gestanzten, geätzten oder gleichmäßiger Struktur. Es kann auch das Gitter z.B. im Siebdruck mit einer Paste, die im aufgedruckten Zustand als Heizleiter wirkt, gedruckt werden. Mit solchen Elementen lassen sich die dünnsten Folien, die bisher noch nicht schweißbar waren, verschweißen.A similar effect can be achieved with galvanically built-up, punched, etched or uniform structure. The grid can also be printed, for example by screen printing, with a paste that acts as a heating conductor when printed. Such elements can be used to weld the thinnest foils that were previously not weldable.

Ein besonderes Problem ist die gleichmäßige Aufheizung von kreisrunden Flächen geringen Durchmessers. Hier kann das Gitter mittig und an der ganzen Peripherie, welche stark leitfähig ist, an den Stromkreislauf angeschlossen werden, wobei das Gitter im Gebiet der Mittelzuführung elektrisch voreinander getrennt ausgeführt ist, so daß nur die Fäden in einer Richtung aufgeheizt werden.A particular problem is the uniform heating of circular ones Small diameter surfaces. Here the grid can be placed in the middle and all around the periphery, which is highly conductive, can be connected to the circuit, whereby the Lattice in the area of the means supply is carried out electrically separated from one another is so that only the threads are heated in one direction.

Es fällt dadurch die bisher übliche kühle Zone in der Mitte weg.This eliminates the previously usual cool zone in the middle.

Das System der gitterförmigen Elektroden kann auch entsprechend auf Peltier-Systeme übertragen werden,The system of grid-shaped electrodes can also be based on Peltier systems are transmitted,

Claims (12)

Patentansprüche a 1 Schweißelement, insbesondere für das Wärmeimpulsverfahren, d a d u r c h g e k e n n z e i c h n e t, daß ein gleichmäßiges Gitter aus Heizleitermaterial verwendet wird. Claims a 1 welding element, in particular for the heat pulse method, d a d u r c h e k e n n n z e i c h n e t that a uniform grid made of heat conductor material is used. 2. nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter eine Gewebe ist. 2. according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the grid is a fabric. 3. nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter aus Heizleitermaterial, z.B. im Siebdruck gedruckt ist. 3. according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the grid is made of heat conductor material, e.g. is screen printed. 4. nach Anspruch 1 bis 3, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter mit einer Auflage aus hinreichend wärmebeständigem Material, mSE. Silikongummi, einseitig oder beidseitig versehen ist, welche vorzugsweise in den Gittermaschen verankert ist. 4. according to claim 1 to 3, d a d u r c h g e k e n n z e i c h n e t that the grid with a layer of sufficiently heat-resistant material, mSE. Silicone rubber is provided on one or both sides, which is preferably in the Grid mesh is anchored. 50 nach Anspruch 1 bis 4, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter durch Einfügung, Wegnehmen, Auswechseln von Heizleitermaterial elektrisch abgestimmt ist. 50 according to claims 1 to 4, d u r c h g e n n n z e i c h n e t that the grid by inserting, removing, replacing heating conductor material is electrically tuned. 6. nach Anspruch 1 bis 5, d a d u r c h g e k e n n z e i c h r e t, daß das Gitter durch Einfügen von leitfähigem Material, z.B. Silber oder galvanischem Niederschlag, partiell elektrisch abgestimmt bzw. 6. according to claim 1 to 5, d a d u r c h g e k e n n z e i c h r e t that the grid is made by inserting conductive material, e.g. silver or galvanic Precipitation, partially electrically tuned or in seiner Heizwirkung verändert ist. is changed in its heating effect. 7. nach Anspruch 1 bis 6, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter verformt ist, wobei es vorzugsweise in die Abdekcung so eingebettet ist, daß diese die Verformung stützt. 7. according to claim 1 to 6, d a d u r c h g e k e n n z e i c h n e t that the grid is deformed, it being preferably embedded in the cover is that this supports the deformation. 8. nach Anspruch 1 bis 7, d a d u r c h g e k e n n z e i c h n e t, daß in die Abdeckung ein Kühlsystem, z.B. Kanäle, zum Kühlmitteldurchlauf eingearbeitet ist. 8. according to claim 1 to 7, d a d u r c h g e k e n n z e i c h n e t that in the cover a cooling system, e.g. channels, incorporated for the coolant passage is. 9. nach Anspruch 1 bis 8, d a d u r c h g e k e n n z e i c h n e t, daß die Abdeckung mit Schaumstoff oder einem Schlauch, der pneumatisch federnd wirkt, versehen ist. 9. according to claim 1 to 8, d a d u r c h g e k e n n z e i c h n e t that cover with foam or a hose that is pneumatically resilient acts, is provided. 10. nach Anspruch 4 bis 9, d a d u r c h g e k e n n z e i c h n e t, daß mehrere, vorzugsweise elektrisch getrennte Heizschichten nebeneinander oder übereinander kombiniert sind.10. according to claim 4 to 9, d a d u r c h g e k e n n z e i c h n e t that several, preferably electrically separated heating layers next to one another or are combined one above the other. 11. nach Anspruch 1 bis 10, d a d u r c h g e k e n n ze i c h n e t, daß das Gitter bandförmig, flächenförmig ausgebildet ist, wobei die elektrischen Querschnitte zwischen den Stromanschlüssen auf die erforderliche Wärmeabgabe abgestimmt sind.11. according to claim 1 to 10, d a d u r c h g e k e n n ze i c h n e t that the grid is band-shaped, planar, with the electrical Cross-sections between the power connections matched to the required heat dissipation are. 12. nach Anspruch 1 bis 11, d a d u r c h g e k e n n z e i c h n e t, daß das Gitter nach dem Peltier-System aufgebaut, zu Kühlzwecken geeignet ist.12. according to claim 1 to 11, d a d u r c h g e k e n n z e i c h n e t that the grid constructed according to the Peltier system is suitable for cooling purposes.
DE2264047A 1972-12-29 1972-12-29 Mesh screen heating strip - for welding plastics Pending DE2264047A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146775A1 (en) * 1983-12-19 1985-07-03 Georg Fischer Aktiengesellschaft Arrangement for welding moulded parts of thermoplastic resin
CN103303527A (en) * 2012-03-13 2013-09-18 富士音派路思机电有限公司 Heater used for pulse heat sealing machine
EP2548717A3 (en) * 2011-07-20 2013-10-30 Fuji Impulse Co., Ltd. Heater for impulse heat sealer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0146775A1 (en) * 1983-12-19 1985-07-03 Georg Fischer Aktiengesellschaft Arrangement for welding moulded parts of thermoplastic resin
EP2548717A3 (en) * 2011-07-20 2013-10-30 Fuji Impulse Co., Ltd. Heater for impulse heat sealer
CN103303527A (en) * 2012-03-13 2013-09-18 富士音派路思机电有限公司 Heater used for pulse heat sealing machine

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