Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1978-03-13
1979-10-16
Wityshyn, Michael G.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156221, 215232, 215251, 215253, B29C 2702, B65D 4132
Patent
active
041712366
ABSTRACT:
A method is provided for forming a fracturable seal of the type wherein a plastic cup-shaped closure is hermetically sealed to a plastic planar surface, such as the neck of pharmaceutical solution containers. The seal is formed with the closure by forcing a die heated above the melting point of the plastic material into the planar surface, with the sealing die also being in heat exchange relationship with a portion of the closure. Both the planar surface and the closure adjacent thereto become molten and the surface material is displaced to form a fused seal transverse to the surface. The surface is depressed at least 0.005 inch from its original height by the sealing action of the die, and a frangible section is formed in the vertical side wall of the depression. The seal will be fractured due to tension stress when the closure is removed from the surface.
REFERENCES:
patent: 3142601 (1964-07-01), Polk et al.
patent: 3378423 (1968-04-01), Polk et al.
patent: 3904060 (1975-09-01), McPhee
patent: 3923182 (1975-12-01), Choksi
patent: 3929246 (1975-12-01), Leitz
Fowles Thomas A.
Winchell David A.
Baxter Travenol Laboratories Inc.
Flattery Paul C.
Gerstman George H.
Kirby, Jr. John P.
Wityshyn Michael G.
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