Think of the printing company, or printing production, as some kind of a machine. Somebody throws the switch to start the machine and begin production. If that switch is thrown by a customer or end user, or even somebody further down the production line/stream, it's a pull system. If that switch is thrown by somebody further up the production line or stream, it's a push system.
In commercial printing the switch is thrown by the end user/customer. We do not use an internal kanban system and produce plates only when the press has used up all available plates or jobs; that would put the press down while prepress got their act together. Keeping the press working is the priority for internal success, it's a key internal metric. To be "ideologically pure" in this regard would be foolish.
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