DE19736462C2 - Method and device for thermoforming thermoplastics - Google Patents
Method and device for thermoforming thermoplasticsInfo
- Publication number
- DE19736462C2 DE19736462C2 DE1997136462 DE19736462A DE19736462C2 DE 19736462 C2 DE19736462 C2 DE 19736462C2 DE 1997136462 DE1997136462 DE 1997136462 DE 19736462 A DE19736462 A DE 19736462A DE 19736462 C2 DE19736462 C2 DE 19736462C2
- Authority
- DE
- Germany
- Prior art keywords
- blank
- radiation
- radiation source
- intensity
- temperature
- 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
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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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
- B29C51/422—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential
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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
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
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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
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6418—Heating of preforms
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
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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
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Toxicology (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Warmverformen von Thermoplasten nach dem Oberbegriff des Patentan spruches 1 bzw. dem Oberbegriff des Patentanspruches 9.The invention relates to a method and an apparatus for Thermoforming of thermoplastics according to the preamble of the patent Proof 1 or the preamble of claim 9.
Ein derartiges Verfahren und eine derartige Vorrichtung sind aus der EP 0 640 455 A1 bekannt.Such a method and such a device are out EP 0 640 455 A1.
Bei derartigen Verfahren bzw. Vorrichtungen kommt es ganz wesent lich darauf an, dass der Rohling ein zur Verformung geeignetes Temperaturprofil aufweist, das dem herzustellenden Endprodukt an gepasst ist. Ein derartiges Temperaturprofil kann bei komplizier ten Formen des Produktes, insbesondere dann, wenn niedrige Wand stärken gewünscht sind, relativ kompliziert bzw. über die Umfangs fläche des Formkörpers hinweg sehr inhomogen seien. Gewünscht ist allerdings eine nahezu konstante Temperatur über die gesamte Wand stärke, also die "Tiefe" des Rohlings. Um dies zu erreichen, wird insbesondere mit Heißluftquellen oder auch Infrarotstrahlern, in vielen Fällen auch mit beheizten, in mehreren Stufen arbeitenden Formen (z. B. beim Tiefziehen) gearbeitet. Hierbei kann die Wärme praktisch ausschließlich über die Oberfläche des Rohlings zuge führt werden, so dass man zur Erzielung der konstanten Temperatur im Materialinneren, also über dessen Wandstärke auf den Wärme transport durch Wärmeleitung innerhalb des Materials angewiesen ist. Dies wiederum setzt eine relativ langsame Erwärmung bzw. Ver weilzeiten voraus, innerhalb derer der Temperaturausgleich (über die Tiefe des Materials) stattfinden kann. Dadurch werden Verfah ren und Vorrichtung der eingangs genannten Art aufwendig und störanfällig. Insbesondere ist auch die Einstellung eines geeigneten Temperaturprofils über die räumlichen Ausdehnungen des Rohlings ausgesprochen schwierig.With such methods or devices, it is very important Lich that the blank is a suitable for deformation Has temperature profile that the end product to be manufactured is fit. Such a temperature profile can be complicated ten forms of the product, especially when low wall strengths are desired, relatively complicated or over the scope surface of the molded body are very inhomogeneous. Is desired however, an almost constant temperature over the entire wall strength, so the "depth" of the blank. To achieve this, especially with hot air sources or infrared heaters, in many cases also with heated, working in several stages Forms (e.g. in deep drawing) worked. Here, the heat practically exclusively over the surface of the blank leads so that you can achieve constant temperature inside the material, i.e. via its wall thickness on the heat transport by heat conduction within the material is. This in turn sets a relatively slow heating or Ver times ahead, within which the temperature compensation (above the depth of the material) can take place. This way, ren and device of the type mentioned expensive and prone to failure. In particular, the setting of a suitable one Temperature profile over the spatial dimensions of the blank extremely difficult.
Der Erfindung liegt die Aufgabe zugrunde, Verfahren und Vorrich tung der eingangs genannten Art dahingehend weiterzubilden, dass eine vereinfachte Erwärmung des Rohlings mit verbesserter Tempera tur-Genauigkeit erzielbar ist.The invention has for its object the method and Vorrich training of the type mentioned at the outset to the effect that simplified heating of the blank with improved tempera tur accuracy is achievable.
Diese Aufgabe wird durch ein Verfahren nach Anspruch 1 bzw. eine Vorrichtung nach Anspruch 9 gelöst.This object is achieved by a method according to claim 1 and a Device according to claim 9 solved.
Hierbei liegt das Intensitätsmaximum im nahen Infrarot, und zwar bei 0,8-1,0 µm, also in einem Bereich von Wellenlängen, die er heblich kürzer sind als die Wellenlängen, bei welchen das Intensi tätsmaximum üblicher Wärmestrahlungsquellen liegt. Bevorzugterma ßen wird nicht nur eine erheblich gleichmäßigere Erwärmung des Rohlings in seiner Tiefe erreicht, sondern auch eine erheblich schnellere Erwärmung. Bei Verwendung eines Temperaturstrahlers mit zumindest im wesentlichen einem kontinuierlichen Strahlungsspekt rum ergibt sich dies dadurch, dass bei der hier vorgeschlagenen Einstellung des Intensitätsmaximums auf kürzere Wellenlängen die Strahlungsintensität etwa mit der 4. Potenz der Temperatur des Strahlers zunimmt.Here the intensity maximum is in the near infrared, namely at 0.8-1.0 µm, i.e. in a range of wavelengths that he are considerably shorter than the wavelengths at which the intensi maximum maximum of conventional heat radiation sources. Bevorzugterma not only will the heating of the Rohlings reached in depth, but also significantly faster warming. When using a temperature radiator with at least essentially a continuous radiation spectrum Rum this results from the fact that the proposed here Setting the intensity maximum to shorter wavelengths Radiation intensity approximately with the 4th power of the temperature of the Spotlight increases.
Vorzugsweise wird die Strahlung mittels optischer Einrichtungen, insbesondere Spiegel, Gitter oder dergleichen Einrichtungen der Strahlungs-Optik derart verteilt dem Rohling zugeführt, dass ein der Formeinrichtung angepasstes Temperaturprofil innerhalb des Rohlings nach Ablauf des definierten Zeitraums eingestellt wird. Es wird also nicht die Strahlungsquelle z. B. durch Energiezufuhr eingestellt bzw. verändert, es wird vielmehr die dem Rohling zuge führte Strahlung den Anforderungen entsprechend "eingestellt". Hierbei ist es von Vorteil, dass die Strahlung ihr Intensitätsmaximum bei den vorgenannten Wellenlängenbereichen aufweist, so dass die üblichen Mittel der Strahlungs-Optik verwendbar sind.The radiation is preferably by means of optical devices, in particular mirrors, gratings or similar devices Radiation optics distributed to the blank in such a way that a the molding device adapted temperature profile within the Blank is discontinued after the defined period. So it is not the radiation source z. B. by supplying energy adjusted or changed, it is rather the blank led radiation "adjusted" according to the requirements. It is advantageous here that the radiation has its maximum intensity at the aforementioned wavelength ranges, so that the usual means of radiation optics can be used.
Besonders vorzugsweise werden die zu erwärmenden Objekte bzw. Roh linge mit einer Strahlungsflussdichte über 0,5 MW/m2, insbesondere über 1 MW/m2 beaufschlagt.The objects or blanks to be heated are particularly preferably subjected to a radiation flux density of more than 0.5 MW / m 2 , in particular more than 1 MW / m 2 .
Vorzugsweise wird die Wellenlänge des Intensitätsmaximums durch Einstellung, insbesondere aber durch eine Regelung (also Messung und Rückführung der relevanten Strahlungsgrößen) der Temperatur eines Heizelements eingestellt. Besonders bevorzugt ist hierbei die Einstellung der Wendel-Temperatur einer Halogenlampe. Nachdem diese auf relativ hohe, für Halogenlampen unüblich hohe Temperatu ren (zur Erreichung der genannten kurzen Wellenlängen) eingestellt werden muss, sind vorzugsweise entsprechende Maßnahmen getroffen, um dennoch eine lange Lebensdauer der verwendeten Halogenlampe zu gewährleisten. Insbesondere werden hierfür besondere Kühlungsmaß nahmen sowohl im Bereich der (Quarz-)Glaskörper als auch im Be reich der Sockel der Halogenlampen getroffen.The wavelength of the intensity maximum is preferably determined by Adjustment, but especially by regulation (i.e. measurement and feedback of the relevant radiation parameters) of the temperature a heating element set. It is particularly preferred here the setting of the filament temperature of a halogen lamp. After this this to a relatively high temperature, which is unusually high for halogen lamps ren (to achieve the short wavelengths mentioned) appropriate measures are preferably taken, to ensure a long service life of the halogen lamp used guarantee. In particular, special cooling dimensions are used for this both in the area of the (quartz) vitreous bodies and in the Be Richly hit the base of the halogen lamps.
Um nun die Intensität den Anforderungen entsprechen einzustellen, wird vorzugsweise alternativ oder kumulativ die Entfernung zwi schen der Strahlungsquelle und dem Rohling und/oder eine optische Filtereinrichtung wie Gitter oder Graufilter oder dergleichen und/oder Choppereinrichtungen verwendet.In order to adjust the intensity to meet the requirements, alternatively or cumulatively, the distance between the radiation source and the blank and / or an optical Filter device such as a grid or gray filter or the like and / or chopper devices used.
Bei dem kommerziell besonders interessanten Bereich der Verwendung des Verfahrens zur Herstellung von Polyethylen-Flaschen wird vor zugsweise so vorgegangen, dass der definierte Aufheiz- oder Bestrahlungs-Zeitraum 10 sec, besonders bevorzugterweise 5 sec nicht wesentlich überschreitet. Dadurch ist zum einen eine gleich mäßige Erwärmung der üblichen Rohlinge oder Preforms sicherge stellt, andererseits kann mit hoher Geschwindigkeit produziert werden. In the commercially particularly interesting area of use of the method for producing polyethylene bottles, the procedure is preferably such that the defined heating or irradiation period does not significantly exceed 10 seconds, particularly preferably 5 seconds. This ensures, on the one hand, that the usual blanks or preforms are heated uniformly, and, on the other hand, can be produced at high speed.
Der Preform wird vorzugsweise im wesentlichen unmittelbar nach Be aufschlagung mit der Strahlung ohne wesentliche strahlungsbeauf schlagungsfreie Verweildauer dem Formwerkzeug, insbesondere einer Blas-Streck-Einrichtung zur Verformung übergeben. Dadurch ist si chergestellt, dass sich das (insbesondere durch Optiken) einge stellte Temperaturprofil entlang des Körper nicht durch Wärmelei tung innerhalb des Preforms verändern kann.The preform is preferably essentially immediately after loading impact with the radiation without significant radiation impact-free dwell time of the mold, in particular one Hand blow-stretching device for deformation. This makes it si ensured that this (especially through optics) did not set temperature profile along the body by heat can change within the preform.
Zur Herstellung von Tiefziehteilen ist es bevorzugt, wenn der Roh ling ohne wesentliche Wärmezufuhr von dem Werkzeug auf den Rohling verformt wird. Insbesondere kann dies geschehen, indem der Rohling in einem einzigen Ziehvorgang geformt wird. Dadurch ist gewähr leistet, dass das (insbesondere durch optische Mittel) eingestell te Temperatur-Profil im Rohling im wesentlichen beibehalten bleibt und die Gefahr eines Anklebens des Rohlings am Tiefziehwerkzeug vermieden wird, wie dies insbesondere bei solchen Tiefziehwerkzeu gen der Fall ist, bei welchen die Erwärmung des Rohlings durch das Werkzeug selbst erfolgt.For the production of deep-drawn parts, it is preferred if the raw ling without substantial heat supply from the tool to the blank is deformed. In particular, this can be done by using the blank is formed in a single drawing process. This guarantees does that (especially by optical means) te temperature profile in the blank is essentially maintained and the danger of the blank sticking to the deep-drawing tool is avoided, as is particularly the case with such deep-drawing tools is the case in which the heating of the blank by the Tool itself is done.
Die Vorrichtung umfasst also eine Strahlungsquel le mit einer Regeleinrichtung zum Regeln eines Emissionswellenlän genbereichs der Strahlungsquelle derart, dass das Intensitätsmaxi mum der Strahlungsquelle in einem Wellenlängenbereich liegt, in nerhalb dessen der Thermoplast mit einem niedrigen Absorptionsgrad bzw. einem höheren Transmissionsgrad als bei längeren Wellenlängen einfallende oder auftreffende Strahlung absorbiert bzw. hindurch lässt oder eindringen lässt. Diese Strahlungsquelle ist vorzugs weise so ausgebildet, dass ihr Intensitätsmaximum im nahen Infra rot und zwar bei 0,8 bis 1,0 µm liegt. Der Absorptionsgrad soll hierbei so niedrig sein bzw. der Transmissionsgrad so hoch sein, dass eine der Dicke des zu bearbeitenden Rohlings entsprechende Eindringtiefe der Strahlung sichergestellt ist und der Rohling nicht nur an seiner Oberfläche sondern von Anfang an (also ohne Temperaturausgleich über Wärmeleitung) in seinem Inneren erwärmt wird. The device thus comprises a radiation source le with a control device for controlling an emission wavelength opposite range of the radiation source such that the intensity max mum of the radiation source lies in a wavelength range, in within which the thermoplastic with a low degree of absorption or a higher transmittance than at longer wavelengths incident or incident radiation is absorbed or transmitted through lets in or lets in. This radiation source is preferred wise trained so that their intensity maximum in the near Infra red, namely 0.8 to 1.0 µm. The degree of absorption should be so low or the transmittance be so high that one corresponding to the thickness of the blank to be machined Penetration depth of the radiation is ensured and the blank not only on its surface but from the beginning (i.e. without Temperature compensation via heat conduction) heated inside becomes.
Vorzugsweise werden Spiegel, Gitter oder dergleichen Einrichtungen der Strahlungs-Optik vorgesehen, um den Rohling mit einem Tempera turprofil zu erwärmen, welches zur Formung optimal ist.Mirrors, gratings or similar devices are preferred the radiation optics provided to the blank with a tempera to heat the door profile, which is ideal for shaping.
Bei der als Strahlungsquelle vorzugsweise vorgesehenen Halogenlam pe oder dergleichen Strahlungseinrichtung mit einem Heizelement ist vorzugsweise zur Regelung der Wendel-Temperatur ein Stromreg ler vorgesehen, der einen Ist-Wert aus einem entsprechend ausge bildeten Fühler (Pyrometer) erhält, um die Wendeltemperatur bzw. den Wellenlängenbereich, bei welchem sich das Intensitätsmaximum der Strahlungsquelle befindet, konstant zu halten und entsprechend den eingangs genannten Vorgaben einzustellen.In the case of the halogen lam which is preferably provided as the radiation source pe or similar radiation device with a heating element is preferably a current regulator for regulating the coil temperature ler provided that an actual value from a correspondingly formed probe (pyrometer) receives the coil temperature or the wavelength range at which the intensity maximum the radiation source is kept constant and accordingly set the specifications mentioned at the beginning.
Weiterhin wird auch die Intensität (durch Störgrößenaufschaltung bzw. einen Vergleich von Soll- und Ist-Werten) geregelt, so dass innerhalb der eingestellten Zeit der Strahlungsbeaufschlagung das gewünschte Temperaturprofil erreicht wird. Diese Intensitätsein stellung kann durch die Entfernung zwischen Strahlungsquelle und Rohling und/oder optische Filtereinrichtungen und/oder eine Chop pereinrichtung geschehen, welche sozusagen "Strahlungspakete" zum Rohling gelangen lassen, wobei die Choppergeschwindigkeit so ge wählt ist, dass die "Paketdauern" sehr kurz sind in Relation zum Gesamtzeitraum, über welchen dem Rohling Energie zugeführt wird.Furthermore, the intensity (due to feedforward control or a comparison of target and actual values) so that within the set time of exposure to radiation desired temperature profile is reached. This intensity position can be determined by the distance between the radiation source and Blank and / or optical filter devices and / or a chop pereinrichtung happen, which, so to speak, "radiation packages" to Let the blank arrive, the chopper speed so ge is chosen that the "packet duration" is very short in relation to the Total period over which energy is supplied to the blank.
Bei der Herstellung von PET-Flaschen wird die Anordnung derart ge wählt, dass der Rohling innerhalb einer Zeitdauer von unter 10 sec, vorzugsweise von unter 5 sec in den Bereich der Strahlungs quelle gebracht und aus diesem wieder entfernt wird, so dass kein wesentlicher Temperaturausgleich unter Abänderung des (durch opti sche Einrichtungen) eingestellten Temperaturprofils geschehen kann. Zusätzlich oder auch alternativ wird die gesamte Vorrichtung zur Herstellung von PET-Flaschen derart ausgebildet und mit nahe beieinander liegenden Stationen (Strahlungsquelle, Formwerkzeug) und mit schnellen Fördereinrichtungen ausgestattet, dass keine wesentliche Verweildauer des Rohlings bzw. Preforms vorliegt, inner halb deren eine Beaufschlagung mit Strahlungsenergie zur Erwärmung vor der Verformung in der Blas-Streck-Einrichtung geschehen kann. Auch dadurch wird das eingestellte Temperaturprofil im Preform er halten.In the production of PET bottles, the arrangement is ge chooses the blank within a period of less than 10 seconds, preferably of less than 5 seconds in the radiation area source and removed from it, so that no Significant temperature compensation by changing the (by opti cal devices) set temperature profile can. Additionally or alternatively, the entire device trained for the production of PET bottles and with close mutually adjacent stations (radiation source, molding tool) and equipped with fast conveyors that are not essential Dwell time of the blank or preform is present, internal half of which is exposure to radiation energy for heating can happen before the deformation in the blow-stretching device. This also makes the set temperature profile in the preform hold.
Bei der Herstellung von Tiefziehteilen wird ein Tiefziehwerkzeug benutzt, welches eine relativ (gemessen an den bisher benutzten Tiefziehwerkzeugen) niedrige Temperatur aufweist, wobei vorzugs weise lediglich ein einziges Tiefziehwerkzeug vorgesehen ist und damit der Rohling in einem einzigen Tiefziehvorgang geformt wird. Auch hierbei liegt der Vorteil wieder darin, dass keine wesentli che Veränderung des zuvor durch die entsprechende Strahlungsener gie-Zufuhr eingestellten Temperaturprofils erfolgt.A deep-drawing tool is used in the manufacture of deep-drawn parts used, which is a relative (measured from the previously used Thermoforming tools) has low temperature, with preference as only a single deep-drawing tool is provided and so that the blank is formed in a single deep-drawing process. The advantage here is again that no essential che change of the previously by the appropriate radiation generator Set temperature profile is supplied.
Claims (16)
die Erwärmungseinrichtung eine Strahlungsquelle aufweist, die mit einer Regeleinrichtung zum Regeln eines Emissions-Spek trums der Strahlungsquelle derart ausgestattet ist, dass ein Intensitätsmaximum der Strahlungsquelle im Infrarotbereich liegt,
und eine strahlungsoptische Ablenkeinrichtung zur Ablenkung zumindest eines Teils der emittierten Strahlung der Strah lungsquelle in Richtung eines definierten Bereiches der Roh lingsoberfläche vorgesehen ist, um ein definiertes Temperaturprofil entlang der Rohlingsoberfläche einzustellen
dadurch gekennzeichnet, dass
das Intensitätsmaximum im Emissionswellenlängenbereich von 0,8-1,0 µm liegt.9. Apparatus for thermoforming thermoplastics, comprising a heat supply device, for heating a blank, preform or the like semifinished product to a shaping temperature and a shaping device, in particular a blowing (stretching) device, a deep-drawing device or the same shaping tool for shaping the heated blank, in which
the heating device has a radiation source which is equipped with a regulating device for regulating an emission spectrum of the radiation source such that an intensity maximum of the radiation source lies in the infrared range,
and a radiation-optical deflection device for deflecting at least a part of the emitted radiation from the radiation source in the direction of a defined area of the blank surface is provided in order to set a defined temperature profile along the blank surface
characterized in that
the intensity maximum is in the emission wavelength range of 0.8-1.0 µm.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE29724025U DE29724025U1 (en) | 1997-08-21 | 1997-08-21 | Device for thermoforming thermoplastics |
DE1997136462 DE19736462C2 (en) | 1997-08-21 | 1997-08-21 | Method and device for thermoforming thermoplastics |
BR9811610-0A BR9811610A (en) | 1997-08-21 | 1998-08-19 | Method and apparatus for hot molding of thermoplastics |
AU94359/98A AU9435998A (en) | 1997-08-21 | 1998-08-19 | Method and device for hot-forming thermoplastics |
PCT/EP1998/005266 WO1999010160A1 (en) | 1997-08-21 | 1998-08-19 | Method and device for hot-forming thermoplastics |
EP98947440A EP1005412A1 (en) | 1997-08-21 | 1998-08-19 | Method and device for hot-forming thermoplastics |
JP2000507520A JP4562284B2 (en) | 1997-08-21 | 1998-08-19 | Method and apparatus for thermoforming thermoplastic resin |
CN 98808333 CN1267253A (en) | 1997-08-21 | 1998-08-19 | Method and device for hot-forming thermoplastics |
CA002301053A CA2301053A1 (en) | 1997-08-21 | 1998-08-19 | Method and device for hot-forming thermoplastics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997136462 DE19736462C2 (en) | 1997-08-21 | 1997-08-21 | Method and device for thermoforming thermoplastics |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19736462A1 DE19736462A1 (en) | 1999-02-25 |
DE19736462C2 true DE19736462C2 (en) | 2003-06-18 |
Family
ID=7839769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1997136462 Expired - Lifetime DE19736462C2 (en) | 1997-08-21 | 1997-08-21 | Method and device for thermoforming thermoplastics |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1005412A1 (en) |
JP (1) | JP4562284B2 (en) |
CN (1) | CN1267253A (en) |
AU (1) | AU9435998A (en) |
BR (1) | BR9811610A (en) |
CA (1) | CA2301053A1 (en) |
DE (1) | DE19736462C2 (en) |
WO (1) | WO1999010160A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19949923B4 (en) * | 1999-10-16 | 2006-12-21 | Hoesch Metall + Kunststoffwerk Gmbh & Co | Deep-drawing method for producing a cup-shaped molding with undercuts in the shell wall |
DE102007058324A1 (en) | 2007-12-04 | 2009-06-10 | Advanced Photonics Technologies Ag | Highly reflective lining element and irradiation arrangement |
DE102009026259A1 (en) | 2009-07-28 | 2011-02-03 | Krones Ag | Device for warming pre-mold in stretch blow-molding device, has radiator emitting rays in wave-length range, which possesses maximum emission, where wave-length range and maximum emission differ from those of another radiator |
EP2425959A1 (en) | 2010-09-06 | 2012-03-07 | Krones AG | Device and method for heating preforms |
DE102014202302A1 (en) | 2013-07-03 | 2015-01-08 | Technische Universität Dresden | Device for heating preforms |
DE102005000837B4 (en) | 2005-01-05 | 2022-03-31 | Advanced Photonics Technologies Ag | Thermal irradiation arrangement for heating an item to be irradiated |
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DE10051903B4 (en) * | 2000-09-18 | 2005-08-18 | Advanced Photonics Technologies Ag | radiation source |
DE20020148U1 (en) | 2000-09-18 | 2001-03-22 | Advanced Photonics Technologies AG, 83052 Bruckmühl | Radiation source and radiation arrangement |
DE10051904B4 (en) * | 2000-09-18 | 2006-01-05 | Advanced Photonics Technologies Ag | Halogen lamp for infra-red radiation of wide materials, includes heat conducting contacts at ends to produce steep temperature gradient in glass envelope |
DE10051169B4 (en) | 2000-10-16 | 2005-12-08 | Advanced Photonics Technologies Ag | Hand-held irradiation device and thermal processing method |
AU2002212319A1 (en) * | 2000-10-17 | 2002-04-29 | Advanced Photonics Technologies Ag | Stretch blow-moulding method and a heating section |
DE20020150U1 (en) * | 2000-10-17 | 2001-03-08 | Advanced Photonics Tech Ag | Warming section for stretch blow molding |
DE10121160A1 (en) * | 2001-04-30 | 2002-10-31 | Sig Corpoplast Gmbh & Co Kg | Method and device for tempering preforms |
US20040219385A1 (en) * | 2002-08-23 | 2004-11-04 | Rene Mattern | Process for curing powder coatings |
KR20050039744A (en) | 2002-09-17 | 2005-04-29 | 바셀 폴리올레핀 이탈리아 에스.피.에이. | Polyolefin composition with improved abrasion resistance |
DE20221980U1 (en) | 2002-09-26 | 2009-12-17 | Advanced Photonics Technologies Ag | Arrangement for the thermal treatment of a workpiece |
EP1779994B1 (en) * | 2004-07-29 | 2013-06-05 | Mitsui Chemicals, Inc. | Method of producing thermoplastic resin hollow molded product |
DE102005060429B4 (en) | 2005-12-15 | 2020-06-04 | Khs Corpoplast Gmbh | Method and device for blow molding containers |
DE102011052899A1 (en) | 2011-08-22 | 2013-02-28 | Krones Aktiengesellschaft | Heating device and heating method for blow molding machine and blow molding machine |
DE102017120862A1 (en) * | 2017-09-10 | 2019-03-14 | Khs Corpoplast Gmbh | Heating device for the temperature conditioning of preforms and method for operating such a heating device |
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- 1998-08-19 CN CN 98808333 patent/CN1267253A/en active Pending
- 1998-08-19 JP JP2000507520A patent/JP4562284B2/en not_active Expired - Lifetime
- 1998-08-19 AU AU94359/98A patent/AU9435998A/en not_active Abandoned
- 1998-08-19 BR BR9811610-0A patent/BR9811610A/en not_active IP Right Cessation
- 1998-08-19 WO PCT/EP1998/005266 patent/WO1999010160A1/en not_active Application Discontinuation
- 1998-08-19 EP EP98947440A patent/EP1005412A1/en not_active Withdrawn
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EP0640455A1 (en) * | 1993-08-27 | 1995-03-01 | Maschinenfabrik Georg Geiss | Heating for vacuum-forming machines |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19949923B4 (en) * | 1999-10-16 | 2006-12-21 | Hoesch Metall + Kunststoffwerk Gmbh & Co | Deep-drawing method for producing a cup-shaped molding with undercuts in the shell wall |
DE102005000837B4 (en) | 2005-01-05 | 2022-03-31 | Advanced Photonics Technologies Ag | Thermal irradiation arrangement for heating an item to be irradiated |
DE102007058324A1 (en) | 2007-12-04 | 2009-06-10 | Advanced Photonics Technologies Ag | Highly reflective lining element and irradiation arrangement |
DE102009026259A1 (en) | 2009-07-28 | 2011-02-03 | Krones Ag | Device for warming pre-mold in stretch blow-molding device, has radiator emitting rays in wave-length range, which possesses maximum emission, where wave-length range and maximum emission differ from those of another radiator |
EP2425959A1 (en) | 2010-09-06 | 2012-03-07 | Krones AG | Device and method for heating preforms |
DE102014202302A1 (en) | 2013-07-03 | 2015-01-08 | Technische Universität Dresden | Device for heating preforms |
DE102014202302B4 (en) * | 2013-07-03 | 2015-02-19 | Technische Universität Dresden | Device for heating preforms |
EP3725491A1 (en) | 2013-07-03 | 2020-10-21 | watttron GmbH | Device for heating preforms or preformed thermoplastic semi-finished products for use in blow moulding machines |
Also Published As
Publication number | Publication date |
---|---|
CA2301053A1 (en) | 1999-03-04 |
JP2001513465A (en) | 2001-09-04 |
CN1267253A (en) | 2000-09-20 |
JP4562284B2 (en) | 2010-10-13 |
EP1005412A1 (en) | 2000-06-07 |
DE19736462A1 (en) | 1999-02-25 |
WO1999010160A1 (en) | 1999-03-04 |
BR9811610A (en) | 2000-09-05 |
AU9435998A (en) | 1999-03-16 |
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