The investment, which will also safeguard 22 jobs, is being supported by £436,000 from the Welsh Government.
Mrs Hart said:
"Support from the Welsh Government helped secure the new shared service centre for Wales and ensured the investment went ahead at Caerphilly.
"I am delighted that work is now underway on fitting out the new centre which will bring direct and indirect benefits to the local economy while creating a significant number of new jobs and career opportunities."
The international supplier of recycled packaging for consumer goods new shared service centre at Caerphilly Business Park will enable it to centralise its IT, HR and Finance operations.
Caerphilly is already the head office for the group’s recycling operations employing 88 staff out of a total of 392 based at several sites throughout Wales.
Peter McGuinness, managing director at DS Smith Recycling said:
"Our new shared service centre will mean we can work more efficiently, to ultimately deliver better value and service for our clients, while further embracing our commitment to a sustainable working environment."
The investment will also provide an additional direct boost into the local economy through an increased wages bill and recruitment is already underway.