APPAREIL DE CHAUFFAGE PAR PERTES DIELECTRIQUES DE PREFORMES D'ARTICLES EN MATIERE THERMOPLASTIQUE

• Main Author: SAMUEL L. BELCHER, TIMOTHY ROBERT PECK ET ROGER DALLAS SMITH
• Format: Patent
• Language: French
• Published: 09.09.1983
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHAMBERS PROVIDED WITH MANIPULATION DEVICES; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; HAND TOOLS; MAKING GRANULES OR PREFORMS; MANIPULATORS; PERFORMING OPERATIONS; PORTABLE POWER-DRIVEN TOOLS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

L'INVENTION CONCERNE UN APPAREIL DE CHAUFFAGE PAR PERTES DIELECTRIQUES DE PREFORMES D'ARTICLES DEVANT PASSER DANS UNE MACHINE DE MOULAGE PAR SOUFFLAGE.CHAQUE POSTE DE CHAUFFAGE COMPREND UNE ELECTRODE PLATE 50 ET UNE ELECTRODE 76 DONT LE PROFIL PEUT ETRE MODIFIE A L'AIDE DE MOYENS DE MONTAGE APPROPRIES SUR UNE COLONNE 52. LA PARTIE FACONNABLE 110 D'UNE PREFORME 113 EN MATIERE THERMOPLASTIQUE EST ENTRAINEE, EN TOURNANT, DE FACON A PASSER ENTRE LES ELECTRODES 50, 76, TANDIS QU'UN CHAMP ELECTRIQUE ALTERNATIF, PRODUIT PAR UN GENERATEUR 102, EST PRODUIT ENTRE CES ELECTRODES.DOMAINE D'APPLICATION: MACHINES DE MOULAGE PAR RECHAUFFAGE ET SOUFFLAGE. A dielectric heating section for a blow molding machine is provided. Within the heating section a plurality of heating stations are defined by electrode pairs. At least one electrode of each pair is made recontourable to achieve the desired temperature profile within the wall section of a thermoplastic preform suspended therebetween. The preforms are rotated while supported within the alternating electric field created between the electrodes when the electrodes are energized by a radio frequency signal generator. The preforms are moved from station-to-station to achieve high rate controlled heating of each preform.