Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
53374, 156553, 156582, 493205, 493208, B32B 3104
Two face-to-face and continuously moving strips of heat-sealable material are guided around a drum adapted to rotate continuously about an upright axis and carrying a heated sealing ring on its lower end. The sealing ring is smaller in diameter than the drum and is offset radially inwardly from the drum in order to seal the bottom margins of the strips together without forming wrinkles in the seal.
patent: 2422676 (1947-06-01), Haman
patent: 2949151 (1960-08-01), Goldstein
patent: 3153607 (1964-10-01), Ambler
patent: 3339337 (1967-09-01), Rapp
patent: 3350988 (1967-11-01), Schultz
patent: 3933568 (1976-01-01), Schmermund
patent: 4018641 (1977-04-01), Donaldson
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