Some 400 workers struck last week at Tunnock's biscuit factory in Uddingston, near Glasgow, over pay.
Union officials said that if bosses had offered an extra 4p an hour they could have averted industrial action. Bosses refused to budge, despite 11th hour talks with the T&G union.
Production workers are paid £6.25 an hour and their T&G union tabled a pay demand of £7 an hour. The bosses initially offered a 20p rise, followed by an extra 2p. After a strike ballot, management made a final offer of £6.56 an hour.
Last year Tunnock's made a profit of more than £2 million. The union says workers had lost thousands of pounds a year in bonuses and extra earnings with the introduction of new technology and production methods.