Recycler PreZero buys California bag maker Roplast PreZero International German recycling firm PreZero is buying California film and bag maker Roplast. Robots are used for separating PET trays, HDPE packaging and drink cartons at a recycling plant it operates in Belgium. Recycler PreZero US Inc. is buying California-based film and bag maker Roplast Industries Inc., an acquisition it said will help it supply recycled-content packaging and vertically integrate into product manufacturing. The March 1 announcement from Los Angeles-based PreZero comes after the company said in 2020 it was spending $100 million to build or upgrade recycling facilities in Jurupa Valley, Calif., and Westminster, S.C.