• Title/Summary/Keyword: Injection-Press Molding

Search Result 2, Processing Time 0.032 seconds

An Experimental Study on the Reduction of a Birefringence Distribution in LGP by Injection-Press Molding (형체압축성형을 이용한 도광판의 복굴절 저감효과에 관한 실험적 연구)

  • Min I. K.;Kim J. S.;Ko Y. B.;Park H. P.;Yoon K. H.;Hwang C. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • /
    • pp.17-22
    • /
    • 2005
  • The residual birefringence in molded plastic parts can be divided into two kinds of residual birefringence, i.e., the flow induced residual birefringence produced in flowing stages and the thermally induced residual birefringence produced in cooling stage. In this paper, the effect of new injection-press molding process with normal injection mold, i.e. I) injection-compression mode, ii) injection-press mode, on the distribution of birefringence was studied. It was found that the values of the birefringence was reduced at i) low clamping force and ii) longer mold opening length by injection-press molding.

  • PDF

An Experimental Study on The Improvement of Pattern Replication and Birefringence in LGP by Adding Compression Effects (압축효과를 가미한 도광판의 전사성과 복굴절 향상에 관한 실험적 연구)

  • Min I. K.;Kim J. S.;Ko Y. B.;Park H. P.;Yoon K. H.;Hwang C. J.
    • Transactions of Materials Processing
    • /
    • v.15 no.1
    • /
    • pp.27-33
    • /
    • 2006
  • It is necessary to improve the pattern replication and birefringence in LGP(Light guide panel) for better optical performance. In the present paper, the effects of injection-compression and injection-press mode with normal injection mold on the distribution of transcription of pattern and birefringence were studied. It was found that the values of pattern replication was improved and the birefringence was reduced for the cases of low initial clamping force in injection-compression mode and for the cases of longer mold opening length in injection-press mode, repectively.