Oshkosh-based Hoffmaster Group is moving into the rapidly-growing paper-straw manufacturing field. Hoffmaster announced its purchase of Indiana-based Aardvark Straws Monday. The demand for paper straws is growing because several cities have already banned plastic straws. Consumers use an estimated half-billion plastic straws every day, adding to an existing environmental threat. Hoffmaster officials say they think they can double the output of the Aardvark facility in Fort Wayne over the next six-to-nine months.