Members of the Transport and General Workers’ Union are also refusing to work overtime from that date. They are angry about a 2.2% pay rise in what the union calls one of the most profitable parts of the company.
It has warned of further strikes.
Peter Booth, T&G national organiser for manufacturing, said: “Members are determined to see this action through to its logical conclusion, which is an improvement on the current pay offer.”
Around 900 workers are involved in the dispute.