Unite is in talks with the owners of Walkers crisps over the future of 90 jobs at a factory in Lincoln.
Pepsico said there would be "major changes" to the factory under plans to install new packing equipment threatening, 87 of the 251 jobs.
A spokesman told the Morning Star a 90-day consultation period had been launched and the group was in discussions with Unite.
The Lincoln site was originally the home of Smiths crisps and makes Quavers as well as some of the Walkers Sensations range.
Spokesman Steve Switzer said: "Like many businesses we are continually reviewing our operations to ensure we remain competitive."
Mr Switzer said that a new state-of-the-art packing equipment will "significantly" change the way they pack products.
"This has been a tough decision to make and we recognise that this is difficult news for some of our employees."
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