Ardagh Glass has confirmed it plans to close two production lines at its Wheatley plant in Doncaster UK.
It will close the two lines in April due to a downturn in demand from some of its main food customers.
The site produces jars and bottles for the food and soft drinks industies in the UK and employs a total of 384 people.
An Ardagh employee, who did not want to be named, said staff at the plant had been told that between 50 and 60 jobs were likely to be lost in April, but this has not yet been confirmed.
An Ardagh Glass spokesman said: “We regret having to make this decision, but in order to remain competitive and safeguard other jobs in a very challenging market place we have had to reduce our operating costs.
“Consultation regarding the impact on jobs is currently underway with union representatives.”
The company’s other glass production plants in Barnsley, Knottingley (West Yorkshire) and Irvine (Ayrshire, Scotland) are not affected.
The company, formerly known as Rockware Glass, moved to a new warehouse in Barnby Dun Road, Wheatley in 2001 which enabled it to store more than 75 million bottles and jars. Production started in Wheatley in 1969.