Proper Group Holdings LLC is planning to close its plastic tooling and molding plant in Warren and lay off 130 workers due to financial hardship and a private equity takeover that went sideways.Proper Tooling will close its manufacturing plant at 13870 E. 11 Mile Road by March 31 after a series of…
Proper Tooling will close its manufacturing plant in Warren, Mich., by March 31 unless it can find an investor or buyer to rescue it, said Robert Hamood, president of Proper Tooling, a division of Proper Group.