Solar, Crystalline, Multi crystalline, a-Si, Cell, Module, Frame, Design, TUV, UL, KIER, KTL, Certification, Nano, Carbon Nanotube, SWNT, SWNTs, MWNT, MWNTs, Film, Adhesion, PET, Synthesis

Surface Chemistry & Film                                                  1999~2000

POSITION: Research Engineer
PERIODE: 1999~2000
INSTITUTE: POSTECH
SUMMARY: Optimization and Computer Simulation of Thin Film Coated Steel Can for POSCO

MISSION: Optimize the PET film coated steel cans
  • Objective
     -    Optimize the PET film coating process onto the preheated thin steel plate before the canning process, since it was hard to control so many operation parameters
          under the very fast coating speed (10 m/sec) at high temperature (over 270 'C).
  • Method
    -    Model the system with the computer simulation and compare it with actual experimental data.
    -    Density gradient column to measure the density of PET film.
    -    Laser flash method to measure the thermal conductivity of PET.
  • Result
    -    Computer simulation via the finite difference method (FDM) of the actual PET film coating onto the thin steel plate process.
    -    Measure the actual PET film properties to incorporate into the simulation: density, thermal conductivity, and thermal expansion coefficient.
    -    Found out the main processing parameters of the process.
    -    Optimized the actual process based on the computer simulation results.


Surface Chemistry & Film                                                  1997~1999

POSITION: M.S. Degree Graduate Student
PERIODE: 1997 ~ 1999
INSTITUTE: POSTECH
SUMMARY: Synthesis and Evaluation of PET Film for Thin Film Coated Steel Can for POSCO

MISSION: Synthesis of PET-co-polymer for the PET film coated steel cans
  • Objective
     - Produce PET-co-polymer with enhanced properties for the canning process of PET film coated steel plate.
  • Method
     - Co-polymerization with different types of PET monomers.
  • Result
     - Built up the lab scale reactor system with a sealed rotating blade mixer.
     - Produced diol-group modified PET-co-polymer and analyzed with various methods (IR, NMR, DSC). 

MISSION: Evaluate the properties of  PET film on thin steel plate for the PET film coated steel cans
  • Objective
      - Evaluation the properties of PET film (25 µm) on thin (100µm) steel plate.
  • Method
    -    Blister test to measure the adhesion strength.
    -    Permeability test to monitor water transfer rate through the PET film.
    -    Thermal analysis (DSC, TGA, TMA).
    -    X-ray analysis with XPS to measure the crystallinity of PET film before/after the process.
    -    AFM to monitor the morphology of PET film and thin steel plate surface.
  • Result
    -    Developed Blister test to measure the adhesion strength of the PET film coated thin steel plate
             to overcome the limitation of the conventional adhesion strength measurement method.
    -    Monitored permeability of PET film depending on the amount of crystalline in the PET film and find out the optimum crystalline amount in the PET film.
    -    Measured the thermal stability of PET film, glass transition temperature, crystallization temperature, amount of crystalline in the PET film,
              thermal expansion coefficient of PET film.
    -    Evaluated the crystalline amount using XPS.
    -    Found out the effect of the morphology of steel plate.