Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1980-02-08
1981-12-08
Wityshyn, Michael G.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156 66, 156251, 156515, 1565802, 493194, 493203, 493209, B29C 2706, B29C 2708
Patent
active
043046150
ABSTRACT:
Method of and apparatus for producing plastic bags having separable plastic fasteners. A strip of bag making material is advanced step-by-step by bag width sections into a tear sealing station where the strip is retained for a dwell interval. In the station, the separable fastener means of the bag material is subjected to ultrasonic tear sealing as by means of a sonotrode along a bag edge defining line extending across the strip. Also in such station, the thinner bag body material is heat tear sealed along the bag side edge defining line as by means of a heat bar coordinated in operation with the ultrasonic sealing. The sonotrode has a profile comprising a tear line edge and material controlling and sealing rib means spaced from the tear line sealing edge.
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patent: 3749620 (1973-07-01), Montgomery
patent: 3859150 (1975-01-01), Van Amburg
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patent: 4059478 (1977-11-01), Hoffman
Minigrip Inc.
Wityshyn Michael G.
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