If you’ve ever had a restaurant or retail job where you had to flatten dozens of cardboard boxes for recycling, you know the drill: You have to “liberate” the bottom flaps to achieve maximum flatness.
Apparently recyclers of industrial metal cans have the same problem–but with the bottoms welded on, it’s not as simple as removing tape from flaps. Thus these workers use this blade:
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via Dartmaster666
Source: core77