Just use a heavy, clear plastic food saver bag to store the remaining film not yet needed in a 100 foot loader, after using good black electrical tape to wrap the lid to can body.
You can also make a very simple electric knife/sealing bar to size/seal black plastic paper and film bags.
Basically I'm speaking to the wooden board and hinged arm, groved slot, with a stout piano wire/heated by the electrical current from a cell phone charger.
Because it's electric, spend time on YouTube looking at more than one example and to avoid electric shocks.
Cheers.