Do you mean blister packs with clear plastic one side and foil covered backing? They use massive sheets of plastic with medication prefilled indentations on the blister side and then another/same machine covers that with the backing and it is microwave or heat welded together and then cut out with a massive press/cutter. It is what makes them tamper proof (if the pill is not sealed then it will start to degrade at its normal rate). More modern machines do just about everything automagically.
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