Heinz managers and members of the T&G union met this week to discuss a cost-saving package put forward by the T&G after Heinz said in May that it was considering closing the factory and transferring production to the Netherlands.
The proposed cost-saving package included efficiency measures, changes to shifts and some redundancies of workers and managers.
However, a spokesman for Heinz said: "[This restructuring plan] does not bridge the savings gap provided by the closure proposal." He added that a follow up meeting would be held in the next two weeks and that no final decision had been made.
John Jordan, T&G acting national secretary, said: "We hope Heinz don't throw sand in our face and dismiss the efforts that have been made."