grooved seam

grooved seam

grooved seam
A seam in which the edges of two metal sheets are bent approximately 180°, inserted in each other, flattened, and then locked by pressure.
References in periodicals archive ?
The film, which is a composite of micro-millimetre polycellophane and aluminium, fully protects the powdered drink from humidity and other damage, The pouches have grooved seams along all four edges, which ensure that they remain sealed.