Cadbury has confirmed the proposed closure of its West Auckland factory is part of an efficiency drive.
The closure means 200 jobs will go at the Avondale site in the next two years.
The Service and Food Workers Union has criticised the decision saying Cadbury is putting market returns ahead of workers' jobs.
But Cadbury New Zealand says the closure is necessary if the company is to remain competitive.
SFWU spokesperson Jill Ovens says unions will meet with Cadbury next weeks to discuss the options.
Listen to RadioLIVE's Jemma Dempsey interviewing Jill Ovens on the World at Noon.