Twin-sheet thermoforming of plastic fuel tanks

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/18 (2006.01) B29C 65/02 (2006.01) B29C 69/00 (2006.01) B29C 35/16 (2006.01) B29C 51/10 (2006.01) B29C 51/12 (2006.01) B29C 51/14 (2006.01) B29C 51/20 (2006.01) B29C 51/26 (2006.01) B29C 51/38 (2006.01) B29C 51/42 (2006.01) B29C 51/46 (2006.01)

Patent

CA 2508488

A method and a plant for twin-sheet thermoforming of fuel tanks; first and second sheets (SA, SB) of thermoformable plastic material, are separately fed along respective processing lines (10A, 10B). The sheets (SA, SB) are heated and gripped along their peripheral edges by a pneumatically actuate suction and vacuum holding device (15A, 15B), for supporting the heated sheets (SA, SB) in a substantially flat condition while they are moved towards a respective thermoforming station (16A, 16B). Both the molds (17A, 17B) are disposed side by side with their open cavity facing upwards. After thermoforming of the plastic sheets (SA, SB), one of the molds (17B) is turned upside down onto the other mold (17A), to overlap and weld superimposed sealing areas of the two thermoformed shells (GA, GB). Cooling of the molds and thermoformed tank may be performed on a side of the processing lines (10A, 10B).

L'invention concerne un procédé et une installation pour le thermoformage double feuille de réservoirs à carburant. Selon l'invention, une première et une seconde feuille (SA, SB) de matière plastique thermoformable sont acheminées séparément le long de lignes de traitement respectives (10A, 10B). Les feuilles (SA, SB) sont chauffées et saisies le long de leurs bords périphériques par un dispositif de maintien à vide et à aspiration actionné pneumatiquement (15A, 15B) de sorte que les feuilles (SA, SB) chauffées soient soutenues dans un état sensiblement plat lors de leur transport vers leur station de thermoformage respective (16A, 16B). Les deux moules (17A, 17B) sont disposés côte à côte avec leur cavité ouverte tournée vers le haut. A l'issue du thermoformage des feuilles (SA, SB) en plastique, un des moules (17B) est renversé sur l'autre moule (17A) de façon à faire se recouvrir et à souder les zones de scellage superposées des deux coquilles thermoformées (GA, GB). Le refroidissement des moules et du réservoir thermoformé peut être effectué sur un côté des lignes de traitement (10A, 10B).

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