1. materilal: steel,aluminium,copper etc
2. acid etchant
3. make decoration plate,like elevator plate
4. double etch, swing
Auto huge etching linewidth: 1.5mEnter: 0.5mEtching: 4mWashing: 2mStripping: 3mWashing: 2m(neutralization 1m, Water 1m)Drying: 3m(Cool wind 1m, hot...