Vertical grooves and horizontal reinforcing ribs in the corners of a new rigid plastic container are at the heart of an innovative container sidewall strengthening system that has earned U.S. patent No. 7,740,149 B2. Ropak Packaging (Fountain Valley, CA), which bills itself as the largest producer of rigid plastic shipping containers in North America, says the "corner groove product feature" reduces the amount of source material used in making the injection molded containers, while retaining their performance, in particular their stack strength.
The corner groove feature also allows the container's wall thickness to be reduced, cutting the amount of source material used in manufacture. By reducing the wall thickness, the design features also cuts the nesting height, which results in more empty ...