1. Outer Shell Processing
Material requisition (outer tube) - Tube cutting - Bulging - Sectioning - Bulging - Rolling middle radius - Bottom necking - Bottom cutting - Rib stamping - Top rim leveling - Bottom stamping - Bottom rim leveling - Cleaning & drying - Inspection (dent check) - Qualified outer shell
2. Inner Shell Processing
Material requisition (inner tube) - Tube cutting - Tube end leveling - Bulging - Rolling upper radius - Top rim leveling - Bottom rim leveling - Thread rolling - Cleaning & drying - Inspection (dent check) - Butt welding - Leak testing (water test) - Drying - Qualified inner liner
3. Assembly Process (Outer Shell & Inner Liner)
Mouth fitting - Rim welding - Middle base pressing - Bottom welding - Weld inspection - Getter spot welding (to middle base) - Vacuum evacuation - Temperature testing - Electrolysis - Polishing - Temperature testing - Polishing inspection - Outer base pressing - Painting - Spot check (temperature) - Painting inspection - Screen printing - Packaging - Finished product warehousing
