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How It's Made - Cardboard Boxes
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First, the trimmer perforates the boards to create flaps and handles. Rubber sponges cushion the blades so that they only cut the parts they're supposed to. During the trimming, a press condenses the boxes overlapping panels to level out their thickness. Workers usually cut out the sponges by hand to make sure they fit snugly around the blades. The trimmer runs at a speed of eight kilometers per hour. Processing up to ninety boxes a minute. Workers send the cut-offs back to the paper mill to be recycled as many as six times over.
A folding machine now bends them along score lines that the corrugator made earlier. It then applies cold glue to the sections that will join together to form the box. Hot glue on the cardboard is wax coated. The next machine folds over the glued sections. They are invisible once the box is finished. Another machine stacks the boxes in piles. A separator arm moves the boxes to trays called skids, for shipping.
The printing of the boxes began in the factories ink kitchen. Computer-guided dispenser squirts out different shades of ink following a precise recipe to create a particular color one of five thousand in the pallet. One pail holds about twenty kilograms of printing ink. Enough for about two thousand boxes, depending on the coverage needed. The factory uses water-based ink because it dries instantly. The printing press applies the ink to the boards one color group at a time, through four consecutive stations. This factory uses a flexographic printing system. A process that can print drawings and illustrations. Some companies use a lithographic press which can also print photographs.
Back on the trimming line, more complicated types of box flaps and handles require what is called a flatbed trimmer. It holds the boards in place with suction while making intricate perforations. After removing the trimmed bits workers give the boxes one last quality check. Then they stack them and send them off to the warehouse
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