Hot mold stamping of optical plastics and glasses with transcription of super-hydrophobic surfaces

Tomoki Hasegawa, Tatsuhiko Aizawa, Tadahiko Inohara, Kenji Wasa, Masahiro Anzai

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

The oxide-glass lens as well as metallic-glass, optical elements were a typical targeting product to have their surface hydro-phobic or super-hydrophobic for well-defined water repellency. The micro- or nano-texturing processes were developed with use of the femto-second laser machining to control the surface state from hydrophilic to hydrophobic conditions. The femto-second laser processing had possibility to physically control the contact angle up to θ > 150 o . Under this laser induced periodic surface structuring, the ripples with high spatial frequencies were formed on the micro-textured surface by the interference of the incident and reflected laser lights with the scattered or diffracted light near the surface. AISI420 mold was prepared as a die substrate to form the super-hydrophobic surface by the femto-second laser nano-/micro texturing with the tailored design of laser induced periodic surface structuring. This mold was set-up into the cassette die set for hot mold stamping. The mold was directly heated up to the forming temperature above the glass-transition temperature by the high frequency induction heating. The original static contact angle was doubled from 60 o to 113 o by this hot mold stamping.

Original languageEnglish
Pages (from-to)1437-1444
Number of pages8
JournalProcedia Manufacturing
Volume15
DOIs
Publication statusPublished - 2018 Jan 1
Event17th International Conference on Metal Forming, METAL FORMING 2018 - Toyohashi, Japan
Duration: 2018 Sep 162018 Sep 19

Keywords

  • Femto-second laser machining
  • Hot mold stamping
  • Micro-and nano-texturing
  • Optical glasses
  • Super-hydrophobicity

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

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