All plants closed from March 23 through April 3, with production resuming on April 6.
Plants produce 9 million cases of tissue products annually and employ 213 workers.
That still leaves the majority of the cuts hitting white-collar workers and Canadians.
The US president thinks tariffs on foreign imports will discourage companies like GM from shuttering US plants.
Jerry Dias, national president of Unifor, said the union will fight against the planned move “tooth and nail.”
Closures to take place by year-end will affect about 65 workers in Barrie and Peterborough.
The struggling automaker announced it would cut 8,000 jobs last week in an effort to cut costs by almost $2 billion.
Wrapping and tape-maker will also close its Kentucky plant.
Troubled cell phone maker cut 10,000 jobs and shutters main production plant.
Cell-phone maker looks to cut costs and streamline operations as market share plummets.
Company blames economic weakness in Europe for job losses and plant closures on three continents.