A company spokesman said that the firm was “hopeful” the night shift would “be back in place by Easter”.
The Hartlepool site is currently operating two shifts a day running from 6am to 2pm and 2pm to 10pm.
SAICA was keen to stress that no redundancies had been made as a result of the move.
The Oaksway Industrial Estate-based factory manufactures corrugated packaging for customers including Nestlé and several breweries.
SAICA (Sociedad Anónima Industrias Celulosa Aragonesa) bought SCA’s UK corrugated business for £100m. It currently employs 2,000 people in 19 sites across the country and has a turnover of €430m (£386.5m).
The company is currently undergoing a review of its businesses following the purchase of the SCA sites.
Last month, Spanish-owned SAICA announced a £40m investment in facilities in addition to news of the possible closure of two sites, with the loss of up to 264 jobs.
The company said it was consulting on the redundancies and was looking to close plants in Aylesford in Kent by the autumn of this year and at Winsford, Cheshire, by spring of 2010.

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