Manufacturing process of TULC
TULC （Toyo Ultimate Can) is a 2-piece can with significantly improved productivity and environmental friendliness, perfected by radically reexamining raw materials and production process.
TFS (Tin Free Steel) laminated with PET film on both the internal and external surfaces is formed into a cup shape in the same manner as with the DWI can, and then the cup sidewall is thinned by stretch, draw and ironing processes.
Unlike DWI can, there is no coolant used during can forming process, eliminating the need to wash off the coolant after forming and subsequent waste water treatment. Since the can internal surface is laminated with PET film, there is also no need for internal spray coating, drastically reducing CO2 emissions from the baking process.
Can making process of 2-piece can (TULC)
- Uncoil can stock coil and feed downstream.
- Cupping press
- Stamp out coil sheet into cup shape.
- Redraw press
- Thin down can body sidewall with stretch, draw and ironing processes, and form can bottom.
- Heat-set oven
- Remove strain of the film with heat.
- Trim down top edge of can sidewall to a specified can height, and inspect pinholes.
- Print can surface and apply overvarnish.
- Curing oven
- Dry and bake cans.
- Narrow down and flange can top.
- Can inside and outside inspection device
- Inspect defects on can inside and outside.
- Pile up cans on pallets and shrink-wrap the pallets.
- End seaming (by customers)
Comparison of can making processes between TULC and DWI can
Ironing process for ADI can
Can sidewall is thinned down by inserting the cup into a clearance between the punch sleeve and a set of ironing dies. As the coolant is sprayed during can forming process, subsequent can washing and waste water treatment processes are required.
Stretch and ironing process for TULC
Stretch and ironing process is the basic forming method for TULC, which evolved from the stretch and bending process and employs the stretch, draw and ironing process, where the ironing process is performed with back tension. Since PET film serves as the coolant, this method needs no coolant, enabling the reduction of environmental impact by not using water while drastically reducing the can weight.
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