A hand-operated device crimps metal lids onto cans, creating an airtight seal to preserve food. This simple technology is commonly used for home canning and small-scale food preservation operations. An example is a tabletop unit with a hand crank that lowers a seaming roller onto the can lid, sealing it against the can’s rim.
Affordable and requiring no electricity, these devices offer a reliable method for extending the shelf life of foodstuffs. Historically, similar tools have played a vital role in food security, enabling individuals and communities to preserve seasonal harvests and prevent spoilage. This capability remains relevant today, offering independence from commercial food supplies and minimizing waste.