Beverage can making process: Training videos (Part 1)
In the first upload of a 14 part series of videos, CanTech Online looks at how a beverage can is produced. Parts 1-3 can be found, with descriptions of each part of the process, embedded below. Keep checking back for new videos. Videos are courtesy of Ball Packaging Europe. The idea of these videos is to help those who are new to the industry to learn about can making.
Part 1: Blanking and deep drawing
The tinplate strip is unwound, its surface coated with a thin film of lubricant and the strip continuously conveyed to the deep-drawing press.
At first a blank is cut out at each individual tool of the press; the drawing ram then presses this blank through the draw ring to form a cup. The tool is made up of nine to 10 individual tools which are arranged next to each other and behind each other.
Part 2: Wall ironing and end forming
The cup is conveyed to the wall-ironing machine from the top. The ram first pushes it through the redraw ring to reduce its diameter to the punch diameter whilst retaining the sheet thickness. The cup is held by a blank holder to prevent puckers.
There is a gap between the punch and the wall-ironing rings 1 to 4 immediately after the redraw ring where the wall thickness of the can is reduced by “ironing” the tin plate and consequently lengthening the can.
At the end of this stroke, the punch with the can comes into contact with the base panelling tool and the can base is formed. When the ram is withdrawn, the can is removed from the punch by a stripper and conveyed out of the machine via an unloader belt.
Part 3: Trimming
In the trimming machine the can is held by a vacuum plate, set in rotation and then moved axially until it reaches the required trimming height. Then the movable cutter unit is guided to the can.
Whilst the can rotates precisely once, the can rim between the upper and lower cutter is cut off burr-free at the required height. The rings cut off are removed by vacuum, pressed into bales and returned to the tin plate production facility.