Abstract: The effect of injection molding parameters, observation azimuth angle, and pitching angle on the angular deviation of curved thin transparent polycarbonate product was analyzed. Mediate screw speed, higher back pressure（4 MPa）and lower scrap quantity were favorable for plasticizing melt. Higher injection melt temperature above 285 ℃ and mold temperature above 90 ℃ in sured flowability and molecular relaxation resulted in homogeneous microstructure with lower deviation angle. Longer packaging rendered better optical product with denser and lower stress, however, too high packaging pressure may induce flow trace. Deviation angle below 8′ was suitable for transparent products.

Key words: optical angle deviation, curved transparent product, injection molding process, polycarbonate