BENTONVILLE, Ark. — Wal-Mart here is turning cardboard waste collected from its stores into boxes for its private-label take and bake pizzas. The system reduces costs while creating a more durable box, according to the retailer. After being bailed by employees and sent to partner Pratt Industries, the cardboard is turned into pulp, and the pulp is made into liner board, a thick, brown wrapping paper that gets tested for contaminants before it’s shipped to Pratt’s box plant. There the paper ...

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