Method and apparatus for forming high-impact, transparent,...

B - Operations – Transporting – 29 – C

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B29C 51/08 (2006.01) B29C 51/00 (2006.01) B29C 51/04 (2006.01) B29C 35/16 (2006.01) B29C 51/10 (2006.01) B29C 51/26 (2006.01) B29C 51/32 (2006.01) B29C 51/42 (2006.01) B29C 51/46 (2006.01)

Patent

CA 2457737

A method and apparatus are provided for forming a sheet (16) of polymeric material, such as polycarbonate. A forming mold (10) is provided having halves (12, 14) that engage for forming a heated sheet (16) therebetween. Each of the halves (12, 14) defines an interior cavity (18, 22) having a peripheral edge. The sheet (16) is retained between the peripheral edges (34-40, 52-58) of the halves (12, 14) and a vacuum (60) is generated within one of the cavities for drawing the sheet therein, whereby a sensing mechanism (80) detects a draw depth for initiating a cooling mechanism (20) to cool the sheet to a temperature below a glass transition temperature of the material. A series of retention mechanism (62) are provided about the peripheral edge of one of the halves (12, 14), for biasing the sheet (16) into engagement with the peripheral edge of the opposing half. A trimming mechanism (88) is further provided for trimming the perimeter of the sheet (16) to a desired form.

Procédé et dispositif permettant de former une feuille (16) de matériau polymère tel qu'un polycarbonate. Un moule (10) comporte deux demi-coquille (12,14) qui s'emboîtent pour former entre elles une feuille chauffée (16). Chacune des demi-coquilles (12,14) définit une cavité interne (18,22) présentant un bord périphérique. La feuille (16) est maintenue entre les bords périphériques (34-40, 52-58) des demi-coquilles (12,14). On crée une dépression (60) dans l'une des cavités afin d'aspirer la feuille à l'intérieur cependant qu'un mécanisme détecteur (80) détecte la profondeur d'aspiration et déclenche un mécanisme de refroidissement (62) qui abaisse la température au-dessous de la température de transition vitreuse du matériau. Une série de mécanismes de rétention disposés sur le bord périphérique de l'une des demi-coquilles (12, 14), forcent la feuille (16) à s'engager sur le bord périphérique de la demi-coquille opposée. On trouve également un mécanisme de dressage (88) qui rogne le périmètre de la feuille (16) à la forme requise.

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