WO2003047311A1 - Method and device for heating plastics using infrared radiation - Google Patents

Method and device for heating plastics using infrared radiation Download PDF

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Publication number
WO2003047311A1
WO2003047311A1 PCT/CH2002/000484 CH0200484W WO03047311A1 WO 2003047311 A1 WO2003047311 A1 WO 2003047311A1 CH 0200484 W CH0200484 W CH 0200484W WO 03047311 A1 WO03047311 A1 WO 03047311A1
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WO
WIPO (PCT)
Prior art keywords
alternating current
heating
current
installation
infrared radiation
Prior art date
Application number
PCT/CH2002/000484
Other languages
French (fr)
Inventor
Serge Delavy
Original Assignee
Aisapack Holding Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aisapack Holding Sa filed Critical Aisapack Holding Sa
Priority to AU2002313443A priority Critical patent/AU2002313443A1/en
Publication of WO2003047311A1 publication Critical patent/WO2003047311A1/en

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Classifications

    • 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
    • H05B1/00—Details of electric heating devices
    • 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
    • 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
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material

Definitions

  • the present invention relates to the field of heating plastics, in particular polyethylene terephthalate (PET) preforms, by means of infrared radiation emitted via an alternating current.
  • PET polyethylene terephthalate
  • the invention relates more particularly to improvements made to the methods and installations making it possible to provide such heating.
  • the processes for transforming plastic packaging, in particular PET, require the control of temperature gradients in the material.
  • the quality of the finished product and the stability of the processes are directly linked to the constancy of the heating power and to obtaining short response times for preferential heating.
  • the heating power is most often supplied by infrared lamps emitting in wavelengths adapted to the heated product. Such heating devices are described in documents DE 39 08 129 A1 and US 5,256,341.
  • the heating power is regulated according to one or the other of the following three principles:
  • Each heating process also has its own disturbance factors: With phase angle switching, the harmonics generated disturb the environment. With pulse width modulation, cycle times of several hundred milliseconds cause significant outages, which results in the appearance of uncontrolled "cold” areas. With advanced syncopated pulse width modulation, cycle times, based on whole alternation numbers, are automatically optimized and shorter than for pulse width. In many cases, cycle times are relatively long, which also results in the appearance of uncontrolled "cold” zones.
  • the present invention relates to a method for heating plastics, in particular PET preforms, by means of infrared radiation emitted by means of an alternating current which is obtained by transformation of a rectified direct current from the network current.
  • the frequency of the alternating current is between 20 and 100 Hz. It has in fact been observed that a frequency less than 20 Hz disturbs the regularity of the heating and a frequency greater than 100 Hz interferes with the reaction times of the filament of the infrared lamps when the heating power is varied. In particular, the (necessary) length of the filaments of the infrared lamps implies the production of a large number of spirals, which generates a significant inductance above 100 Hz.
  • the present invention also relates to an installation for heating PET preforms by means of infrared radiation, the installation comprising an infrared source supplied by an alternating current.
  • the installation also includes a frequency converter making it possible to obtain said alternating current by transforming a rectified direct current from the mains current.
  • the invention offers the advantage of using a stable heating alternating current, independent of the usual variations in the electrical network.
  • the invention makes it possible to considerably reduce, or even eliminate, response times.
  • FIG. 1 schematically illustrates a heating installation according to the invention
  • FIG. 2 schematically illustrates the operating principle of a frequency converter used with the invention.
  • FIG. 3 illustrates a variant of a heating installation according to the invention.
  • the installation illustrated in Figure 1 includes:
  • the frequency converter 12 optional starting current limiting elements depending on the frequency converter
  • FIG. 2 illustrates a frequency converter which can be used in the context of the present invention, in particular with the installation illustrated in FIG. 1.
  • the operation of the frequency converter is as follows:
  • the rectifier 30 transforms the voltage of the single-phase, two-phase or three-phase electrical network 40 into a direct voltage by means of a diode bridge 35 and of the capacitor C1. This DC voltage is regulated and stabilized by the voltage regulator 31 and the capacitor C2. At this level the usual voltage variations of the electrical network are no longer perceptible.
  • a pulse width modulator 34 controls the power stage T1 to T6 of the inverter 32 to reconstruct a two-phase or three-phase pseudo-sinusoidal alternating voltage. In the case of two-phase output 41, only the 4 power stages T1 to T4 are necessary.
  • the frequency and the value of the output alternating voltage 41 are determined by the control and regulation electronics 33.
  • Control orders and fault information are transmitted by digital signals 13 in parallel form.
  • Setpoint 14 controlling the heating power is transmitted by an analog voltage from 0 to 10 V or by a current from 0 or 4 mA to 20 mA.
  • the adjustment parameters, the operating modes and the heating setpoint can be transmitted by an optional serial link 15.
  • FIG. 3 illustrates a configuration in which the power supply 31 and 35, transforming the alternating voltage of the network into direct voltage, is separated from the inverters 32. These, of single-phase or three-phase construction, are connected to the single DC bus of power and share the available power.
  • the invention is of course not limited to the cases and examples described explicitly in the present text. It covers any process or installation using one or more sources of infrared radiation, these can be of any type. Likewise, the invention is not limited to a particular configuration of the heating elements or to a configuration particular frequency converter (s), the latter can also be of any type.

Abstract

The invention concerns a method and an installation for heating plastics, in particular PET preforms, using infrared radiation emitted via an alternating current which is obtained by transforming a rectified direct current for a mains current.

Description

Procédé et dispositif pour le chauffage de plastiques au moyen d'un rayonnement infrarouge Method and device for heating plastics using infrared radiation
Domaine de l'inventionField of the invention
La présente invention se rapporte au domaine du chauffage de plastiques, en particulier de préformes en polyéthylènetéréphtalate (PET), au moyen d'un rayonnement infrarouge émis par l'intermédiaire d'un courant alternatif.The present invention relates to the field of heating plastics, in particular polyethylene terephthalate (PET) preforms, by means of infrared radiation emitted via an alternating current.
L'invention concerne plus particulièrement des améliorations apportées aux procédés et aux installations permettant d'assurer un tel chauffage.The invention relates more particularly to improvements made to the methods and installations making it possible to provide such heating.
Etat de la techniqueState of the art
Les procédés de transformation des emballages en plastique, notamment en PET, exigent la maîtrise de gradients de température dans la matière. La qualité du produit fini et la stabilité des procédés sont directement liées à la constance de la puissance de chauffe et à l'obtention de temps de réponse courts pour un chauffage préférentiel. La puissance de chauffe est fournie le plus souvent par des lampes à infrarouge émettant dans des longueurs d'onde adaptées au produit chauffé. De tels dispositifs de chauf age sont décrits dans les documents DE 39 08 129 A1 et US 5,256,341.The processes for transforming plastic packaging, in particular PET, require the control of temperature gradients in the material. The quality of the finished product and the stability of the processes are directly linked to the constancy of the heating power and to obtaining short response times for preferential heating. The heating power is most often supplied by infrared lamps emitting in wavelengths adapted to the heated product. Such heating devices are described in documents DE 39 08 129 A1 and US 5,256,341.
A ce jour, la puissance de chauffage est régulée selon l'un ou l'autre des trois principes suivants :To date, the heating power is regulated according to one or the other of the following three principles:
- Commutation à angle de phase,- Phase angle switching,
- Modulation de largeur d'impulsion,- Pulse width modulation,
- Modulation de largeur d'impulsion syncopé avancé.- Advanced syncopated pulse width modulation.
Que l'on utilise l'un quelconque des trois principes exposés ci-dessus, des variations non contrôlées de la température de chauffage sont observées. Dans les trois cas, les variations non contrôlées de la température de chauffage sont dues notamment au fait que la puissance de chauffage est assujettie aux variations usuelles du réseau électrique.Whether any of the above three principles are used, uncontrolled variations in the heating temperature are observed. In all three cases, the uncontrolled variations in the heating temperature are due in particular to the fact that the heating power is subject to the usual variations in the electrical network.
Chaque procédé de chauffage présente en outre des facteurs de perturbation qui lui sont propres : Avec la commutation à angles de phase, les harmoniques générées perturbent l'environnement. Avec la modulation de largeur d'impulsion, les temps de cycle de plusieurs centaines de millisecondes provoquent des coupures importantes, ce qui résulte en l'apparition de zones "froides" non contrôlées. Avec la modulation de largeur d'impulsion syncopé avancé, les temps de cycle, basés sur des nombres entiers d'alternance, sont automatiquement optimisés et plus courts que pour la largeur d'impulsion. Dans bien des cas, les temps de cycle sont relativement longs, ce qui résulte également en l'apparition de zones "froides" non contrôlées.Each heating process also has its own disturbance factors: With phase angle switching, the harmonics generated disturb the environment. With pulse width modulation, cycle times of several hundred milliseconds cause significant outages, which results in the appearance of uncontrolled "cold" areas. With advanced syncopated pulse width modulation, cycle times, based on whole alternation numbers, are automatically optimized and shorter than for pulse width. In many cases, cycle times are relatively long, which also results in the appearance of uncontrolled "cold" zones.
Afin de réduire une partie des perturbations, on pourrait envisager un chauffage par alimentation de courant continu. Il convient cependant de relever que ce mode de chauffage est caractérisé par un faible rendement et un prix très élevé.In order to reduce some of the disturbances, one could consider heating by DC power supply. However, it should be noted that this heating method is characterized by low efficiency and a very high price.
Il existe par conséquent un besoin d'améliorer la régulation de la puissance de chauffage de plastiques au moyen d'un rayonnement infrarouge tout en bénéficiant des avantages offerts par l'utilisation d'un courant alternatif pour le chauffage.There is therefore a need to improve the regulation of the heating power of plastics by means of infrared radiation while benefiting from the advantages offered by the use of an alternating current for heating.
Résumé de l'inventionSummary of the invention
La présente invention concerne un procédé pour le chauffage de plastiques, en particulier de préformes en PET, au moyen d'un rayonnement infrarouge émis par l'intermédiaire d'un courant alternatif qui est obtenu par transformation d'un courant continu redressé à partir du courant de réseau.The present invention relates to a method for heating plastics, in particular PET preforms, by means of infrared radiation emitted by means of an alternating current which is obtained by transformation of a rectified direct current from the network current.
Selon un mode de réalisation préférentiel, la fréquence du courant alternatif se situe entre 20 et 100 Hz. On a en effet remarqué qu'une fréquence inférieure à 20 Hz perturbe la régularité du chauffage et qu'une fréquence supérieure à 100 Hz interfère sur les temps de réaction du filament des lampes infrarouges lorsque la puissance de chauffage est variée. En particulier, la (nécessaire) longueur des filaments des lampes infrarouges implique la réalisation d'un grand nombre de spirales, ce qui génère une inductance non négligeable au dessus de 100 Hz.According to a preferred embodiment, the frequency of the alternating current is between 20 and 100 Hz. It has in fact been observed that a frequency less than 20 Hz disturbs the regularity of the heating and a frequency greater than 100 Hz interferes with the reaction times of the filament of the infrared lamps when the heating power is varied. In particular, the (necessary) length of the filaments of the infrared lamps implies the production of a large number of spirals, which generates a significant inductance above 100 Hz.
La présente invention concerne également une installation pour le chauffage de préformes en PET au moyen d'un rayonnement infrarouge, l'installation comprenant une source infrarouge alimentée par un courant alternatif. L'installation comprend en outre un convertisseur de fréquence permettant d'obtenir ledit courant alternatif par transformation d'un courant continu redressé à partir du courant de réseau.The present invention also relates to an installation for heating PET preforms by means of infrared radiation, the installation comprising an infrared source supplied by an alternating current. The installation also includes a frequency converter making it possible to obtain said alternating current by transforming a rectified direct current from the mains current.
L'invention offre l'avantage d'utiliser un courant alternatif de chauffage stable, indépendant des variations usuelles du réseau électrique.The invention offers the advantage of using a stable heating alternating current, independent of the usual variations in the electrical network.
Par ailleurs, en permettant de réaliser un chauffage à basse fréquence (20-100 Hz), l'invention permet de réduire considérablement, voire éliminer, les temps de réponse.Furthermore, by allowing heating to be carried out at low frequency (20-100 Hz), the invention makes it possible to considerably reduce, or even eliminate, response times.
On notera également que la présente invention offre les possibilités suivantes :It will also be noted that the present invention offers the following possibilities:
- Contrôle permanent du courant de sortie avec comparaison aux limites fixées permettant la détection de rupture des éléments de chauffe,- Permanent control of the output current with comparison with the fixed limits allowing the detection of rupture of the heating elements,
- Programmation de puissance réduite de préchauffage ou de rampe de préchauffage pour éviter les chocs thermiques et prolonger la durée de vie des éléments de chauffage,- Programming of reduced preheating power or preheating ramp to avoid thermal shock and extend the life of the heating elements,
- Limitation du courant de sortie,- Limitation of the output current,
- Sorties digitales d'indication de défaut de charge.- Digital outputs for charging fault indication.
Brève description des figures La figure 1 illustre de manière schématique une installation de chauffage selon l'invention La figure 2 illustre de manière schématique le principe de fonctionnement d'un convertisseur de fréquence utilisé avec l'invention. La figure 3 illustre une variante d'une installation de chauffage selon l'invention.BRIEF DESCRIPTION OF THE FIGURES FIG. 1 schematically illustrates a heating installation according to the invention FIG. 2 schematically illustrates the operating principle of a frequency converter used with the invention. FIG. 3 illustrates a variant of a heating installation according to the invention.
Description détaillée de l'inventionDetailed description of the invention
L'installation illustrée à la figure 1 comprend :The installation illustrated in Figure 1 includes:
10 1 ou plusieurs éléments de chauffage branchés à la sortie de puissance 1610 1 or more heating elements connected to the power output 16
11 le convertisseur de fréquence 12 des éléments de limitation de courant de démarrage, optionnels selon le convertisseur de fréquence11 the frequency converter 12 optional starting current limiting elements depending on the frequency converter
13 une liaison digitale transmettant les commandes et permettant le retour des signaux depuis le convertisseur de fréquence13 a digital link transmitting the commands and allowing the return of the signals from the frequency converter
14 une liaison analogique transmettant la consigne de puissance de chauffe.14 an analog link transmitting the heating power setpoint.
15 une liaison sérielle (optionnelle) transmettant au besoin les paramètres de réglage et/ou la consigne de puissance.15 a serial link (optional) transmitting, if necessary, the adjustment parameters and / or the power setpoint.
16 la sortie de puissance biphasée ou triphasée.16 the two-phase or three-phase power output.
20 l'alimentation réseau monophasée, biphasée ou triphasée 21 un disjoncteur de protection en accord avec la puissance du convertisseur de fréquence 22 un contacteur de ligne permettant de séparer le convertisseur de fréquence du réseau pour sa mise hors tension.20 single-phase, two-phase or three-phase network supply 21 a protective circuit breaker in accordance with the power of the frequency converter 22 a line contactor enabling the frequency converter to be separated from the network so that it is switched off.
La figure 2 illustre un convertisseur de fréquence qui peut être utilisé dans le cadre de la présente invention, notamment avec l'installation illustrée à la figure 1. Le fonctionnement du convertisseur de fréquence est le suivant :FIG. 2 illustrates a frequency converter which can be used in the context of the present invention, in particular with the installation illustrated in FIG. 1. The operation of the frequency converter is as follows:
Le redresseur 30 transforme la tension du réseau électrique 40 monophasée, biphasée ou triphasée en une tension continue au moyen d'un pont de diodes 35 et du condensateur C1. Cette tension continue est régulée et stabilisée par le régulateur de tension 31 et le condensateur C2. A ce niveau les variations de tension usuelles du réseau électrique ne sont plus perceptibles.The rectifier 30 transforms the voltage of the single-phase, two-phase or three-phase electrical network 40 into a direct voltage by means of a diode bridge 35 and of the capacitor C1. This DC voltage is regulated and stabilized by the voltage regulator 31 and the capacitor C2. At this level the usual voltage variations of the electrical network are no longer perceptible.
Un modulateur de largeur d'impulsions 34 commande l'étage de puissance T1 à T6 de l'onduleur 32 pour reconstruire une tension alternative pseudo-sinusoïdale biphasée ou triphasée. En cas de sortie biphasée 41 , seuls les 4 étages de puissance T1 à T4 sont nécessaires.A pulse width modulator 34 controls the power stage T1 to T6 of the inverter 32 to reconstruct a two-phase or three-phase pseudo-sinusoidal alternating voltage. In the case of two-phase output 41, only the 4 power stages T1 to T4 are necessary.
La fréquence et la valeur de la tension alternative de sortie 41 sont déterminées par l'électronique de commande et de régulation 33.The frequency and the value of the output alternating voltage 41 are determined by the control and regulation electronics 33.
Les ordres de commande et les informations de défaut sont transmises par des signaux digitaux 13 sous forme parallèle.Control orders and fault information are transmitted by digital signals 13 in parallel form.
La consigne 14 commandant la puissance de chauffe est transmise par une tension analogique de 0 à 10 V ou par un courant de 0 ou 4 mA à 20 mA.Setpoint 14 controlling the heating power is transmitted by an analog voltage from 0 to 10 V or by a current from 0 or 4 mA to 20 mA.
Les paramètres de réglage, les modes de fonctionnement et la consigne de chauffe peuvent-être transmis par une liaison sérielle 15 optionnelle.The adjustment parameters, the operating modes and the heating setpoint can be transmitted by an optional serial link 15.
La figure 3 illustre une configuration dans laquelle l'alimentation 31 et 35, transformant la tension alternative du réseau en tension continue, est séparée des onduleurs 32. Ceux-ci, de construction monophasée ou triphasée, sont raccordés à l'unique bus DC de l'alimentation et se partagent la puissance disponible.FIG. 3 illustrates a configuration in which the power supply 31 and 35, transforming the alternating voltage of the network into direct voltage, is separated from the inverters 32. These, of single-phase or three-phase construction, are connected to the single DC bus of power and share the available power.
L'invention n'est bien entendue pas limitée aux cas de figure et exemples décrits de façon explicite dans le présent texte. Elle couvre tout procédé ou installation utilisant une ou plusieurs sources de rayonnement infrarouge, celles-ci pouvant être de n'importe quel type. De même, l'invention ne se limite pas à une configuration particulière des éléments de chauffage ou à une configuration particulière du ou des convertisseurs de fréquence, ces derniers pouvant d'ailleurs être de n'importe quel type. The invention is of course not limited to the cases and examples described explicitly in the present text. It covers any process or installation using one or more sources of infrared radiation, these can be of any type. Likewise, the invention is not limited to a particular configuration of the heating elements or to a configuration particular frequency converter (s), the latter can also be of any type.

Claims

Revendications claims
1. Procédé pour le chauffage de plastiques, en particulier de préformes en PET, au moyen d'un rayonnement infrarouge émis par l'intermédiaire d'un courant alternatif, caractérisé en ce que ledit courant alternatif est obtenu par transformation d'un courant continu redressé à partir du courant de réseau.1. Method for heating plastics, in particular PET preforms, by means of infrared radiation emitted by means of an alternating current, characterized in that said alternating current is obtained by transformation of a direct current rectified from the mains current.
2. Procédé selon la revendication précédente caractérisé par le fait que la fréquence dudit courant alternatif se situe entre 20 et 100 Hz.2. Method according to the preceding claim characterized in that the frequency of said alternating current is between 20 and 100 Hz.
3. Procédé selon l'une quelconque des revendications précédentes caractérisé par le fait que la fréquence dudit courant alternatif peut être variée.3. Method according to any one of the preceding claims, characterized in that the frequency of said alternating current can be varied.
4. Procédé selon l'une quelconque des revendications précédentes caractérisé par le fait que ledit courant alternatif est généré selon un principe de hachage et de reconstitution d'une pseudo sinusoïde.4. Method according to any one of the preceding claims, characterized in that the said alternating current is generated according to a principle of chopping and of reconstitution of a pseudo sinusoid.
5. Installation pour le chauffage de préformes en PET au moyen d'un rayonnement infrarouge, ladite installation comprenant une source infrarouge alimentée par un courant alternatif, caractérisé en ce qu'elle comprend en outre un convertisseur de fréquence permettant d'obtenir ledit courant alternatif par transformation d'un courant continu redressé à partir du courant de réseau.5. Installation for heating PET preforms by means of infrared radiation, said installation comprising an infrared source supplied by an alternating current, characterized in that it also comprises a frequency converter making it possible to obtain said alternating current by transforming a rectified direct current from the mains current.
6. Installation selon la revendication précédente caractérisée par le fait que ledit convertisseur de fréquence est conçu pour obtenir un courant alternatif se situant entre 20 et 100 Hz.6. Installation according to the preceding claim characterized in that said frequency converter is designed to obtain an alternating current between 20 and 100 Hz.
7. Installation selon la revendication 5 ou 6 caractérisée par le fait qu'elle comprend en outre un variateur de fréquence dudit courant alternatif. Installation selon l'une quelconque des revendications 5 à 7 caractérisée par le fait qu'elle comprend un bloc d'alimentation transformant la tension alternative du réseau en tension continue, ledit bloc d'alimentation étant connecté à une pluralité d'onduleurs. 7. Installation according to claim 5 or 6 characterized in that it further comprises a frequency converter of said alternating current. Installation according to any one of claims 5 to 7, characterized in that it comprises a power supply unit transforming the alternating voltage of the network into direct voltage, said power supply unit being connected to a plurality of inverters.
PCT/CH2002/000484 2001-11-27 2002-09-03 Method and device for heating plastics using infrared radiation WO2003047311A1 (en)

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