The holding company for closely held National Envelope was preparing over the weekend for a potential bankruptcy filing that would be its second in three years, the Wall Street Journal reported today. NE Opco Inc., formerly National Envelope Corp. and still doing business as National Envelope, will likely seek chapter 11 protection this week. The goal is to facilitate a sale of the company, with publicly traded competitor Cenveo Inc. a possible bidder. National Envelope last emerged from bankruptcy protection in the summer of 2010 and was sold to Los Angeles investment firm Gores Group LLC. The manufacturer at the time listed assets and debt of as much as $500 million each and said that the growing use of email and the recession had decreased sales and led to more than three years of losses.