SIPTU and UNITE say they're taking the action in a row over the company's plans to outsource 17 jobs at the facility.
Mondelez, the company that owns Cadbury's, says their plans are aimed at strengthening the firm to secure its future.
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Mondelez says affected staff at Cadbury's have been accommodated elsewhere.
The union say the strike will bring the production of chocolate to a halt at the factory.
