Solo Cup Co. plans to begin shutting down its 551-worker Baltimore County manufacturing plant in October and to complete the long process in March 2012.

The Illinois company, which is closing two other facilities to consolidate efforts in its remaining North American locations, notified the Maryland Department of Labor, Licensing and Regulation of its layoff schedule Monday.

Solo Cup, which makes paper products such as cups and containers in Owings Mills, first announced the layoffs in June.

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