Method of making frangible seal

Details Method of making frangible seal Method of making frangible seal

B - Operations, Transporting

29

C

18/963

B29C 65/76 (2006.01) A61J 1/00 (2006.01) B29C 65/18 (2006.01)

Patent

CA 1112417

METHOD OF MAKING FRANGIBLE SEAL David A. Winchell Thomas A. Fowles ABSTRACT OF THE DISCLOSURE 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.

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