Eliminating flow wrinkles in compression molded panels

Details Eliminating flow wrinkles in compression molded panels Eliminating flow wrinkles in compression molded panels

B - Operations, Transporting

29

C

B29C 43/36 (2006.01)

Patent

CA 2212777

A large surface shaped structure having a smooth surface is formed by compression molding a charge (26) of reinforced molding material containing a thermoplastic material by placing a heated mold charge (26) in a mold (12, 14) which has its peripheral surfaces spaced apart to provide a shear gap (34). The width of the shear gap (34) is adjusted to accept a quantity of molding material sufficient to dissipate residual energy in the flow front of the charge to prevent rebound of the flow front as the structure solidifies.

Un élément moulé ayant une grande surface lisse est formé par compression d'une charge (26) de moulage thermoplastique renfermant un matériau de renforcement. Cette charge (26) chauffée est placée dans un moule (12, 14) dont les surfaces périphériques sont espacées pour constituer un espacement de cisaillement (34). La largeur de l'espacement de cisaillement (34) est ajustée pour laisser passer une quantité suffisante de matériau de moulage pour dissiper l'énergie résiduelle du front de propagation de la charge afin d'empêcher que ce front ne rejaillisse vers l'arrière pendant que le matériau se solidifie.

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