Staff at a Heinz factory which produces beans and soups are set to walk out from Wednesday in a dispute over pay.
Heinz recently embarked on a shake-up of its operations
The Transport & General Workers Union (TGWU) said the action by 800 employees at the factory in Wigan will have an immediate effect on production.
About 1.3 billion cans of beans, soup and spaghetti are produced at the Greater Manchester plant every year.
Workers have been offered a pay deal worth about 4% over two years but are pushing for a rise over inflation.
"The strike will have a significant and immediate impact," a TGWU official said.