A Hauppauge-based supplier of shrink wrap used to protect food, drugs, vitamins and other consumer products from being tampered with before they are sold is planning a $3 million expansion.

Source One Packaging LLC intends to purchase its first digital printing press, allowing it to bring in-house work now done by vendors in other states, said company president Richard Perillo.

The press will be housed in a temperature-controlled room, and Source One will rent an additional 16,800 square feet at 20 Commerce Dr., where it already uses 38,700 square feet, he said last month.

Supermarkets and other retailers require manufacturers “to use shrink film [on products] to prevent tampering,” Perillo told a meeting of the Suffolk County Industrial Development Agency. “They won’t even let you put

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