Heating device for machines for the transformation of...

B - Operations – Transporting – 29 – C

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B29C 49/68 (2006.01)

Patent

CA 2235332

The heating device for a machine for transforming plastic materials, comprises a heating body (39) disposed between two parallel rows (41, 42) of preforms (14). It is provided with at least two heating tubes (40) having bidirectional heating blades (54). These latter are inclined at an angle (.alpha.) such that a first of their faces emits heating radiation (55) in the direction of the adjacent row of preforms and such that the second surface emits its heating radiation (56) substantially in the direction of the free space between the two opposite rows of heating tubes toward the farthest row of preforms. Reflectors (60) are moreover arranged so as to reflect the heating radiation in a horizontal plane toward the preforms (14). The device thus permits obtaining very high energy efficiency whilst avoiding a harmful elevation of the temperature of the machine into which it is integrated.

Ce dispositif de chauffage destiné à une machine de transformation de matières plastiques, comprend un corps chauffant (39) placé entre deux rangées parallèles (41, 42) de préformes (14) et il est pourvu d'au moins deux tubes chauffants (40) présentant des lames chauffantes bidirectionnelles (54). Ces dernières sont inclinées de manière à former un angle (.alpha.) tel qu'une première des faces émet un rayonnement chauffant (55) dans la direction de la rangée adjacente de préformes, et que la seconde émet un rayonnement chauffant (56) sensiblement dans la direction de l'espace libre entre les deux rangées opposées de tubes chauffants, vers la rangée la plus lointaine des préformes. Par ailleurs, on a placé des réflecteurs (60) de manière à ce que ceux-ci réfléchissent le rayonnement chauffant dans un plan horizontal en direction des préformes (14). Ce dispositif permet ainsi d'obtenir une efficacité très haute énergie, tout en évitant une élévation dangereuse de la température de la machine dans laquelle il est monté.

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