One hundred and twenty eight jobs are set to be axed at the Henderson factory of packaging and labelling company Huhtamaki.
E tū, the union which has 150 members at the plant, says the news is a devastating blow for workers there.
"This is a big hit for workers, their families and the west Auckland community. Add the fact that Christmas is looming, and this is very hard news for them," Alvin Livingstone, Union Lead Organiser, said.
Workers are yet to learn who will stay and who will go.
Livingstone said if Huhtamaki goes ahead with the job cuts, the company will have laid off over 260 workers in the last eight years.