Precut cards can also be used for the backing instead of roll-fed material.
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A horizontal tf/f/s machine from Multivac (Kansas City, MO) makes blisters and seals them with card or film in one process. The system forms blisters from rollstock and takes roll-fed film, paperboard, or a paper/poly structure, and uses it to make the blister backing.
Precut cards can also be used for the backing instead of roll-fed material.