In its raw state the aluminum sheet metal is too thick for beverage cans so it s ironed to achieve a thinner more uniform composition.
Canning process sheet metal.
There are basically only three components to sheet metal stamping the sheet metal die and press machine but any single part can require multiple steps to arrive at its final form.
Generally oil canning or waviness in flat metal pans usually originates at the steel mill but in some cases may also be induced by improper installation.
Most aluminum cans for instance are made of ironed aluminum.
The following guide explains a few common processes that might occur during metal stamping.
Filling the containers usually under a vacuum.
This is a very useful process.
A rectangular flat sheet of food grade steel is shaped into a cylinder and closed with a vertical side seam.
Sheet metal may also be ironed to achieve a uniform thickness.
Here are a few key takeaways.
It is used in making aluminium beverage cans.
Oil canning has long been observed to be an inherent condition in all sheet steel due to mill camber and leveling tolerances.
The top end is then seamed in place after the can has been filled.
Cleaning and further preparing the raw food material.
The canning process itself consists of several stages.
It often can be seen in the walls of deep drawn square or rectangular shells see figure 1a and figure 1b caused by the imbalance of metal flow into the drawing cavity see figure 2.
Common sheet metal stamping process.
Pressure canning or boiling water bathing acid foods.
Sterilizing the canned products.
The die at the top is called a punch.
Sheet metal forming process is done on a press and the parts are formed in between two die.
This is a commonly used manufacturing process that helps in manufacturing the parts for tons of known and unknown purposes.
It uniformly thins the workpiece in a specific area.
And labeling and warehousing the finished goods.
It is used to produce a uniform wall thickness part with a high height to diameter ratio.
Unstrained or loose metal in a stamping can result in an oil canning effect.
Very simply oil canning is the result of uneven metal flow during a drawing operation.
The bottom end is then attached with a process called double seaming to create a hermetic seal.
Closing and sealing the containers.
Boiling and pressure canning time have the most notable variable to pay attention to.
Sheet metal is formed cold.
The reference chart below shows style of pack jar size head space process time dial gauge and weighted gauge for pressure canning or boiling acid foods.