Robert William Butler
Nursing at Wichita Dr, Ulysses, KS

4226330, Oct 7, 1980

Nov 1, 1976

5/738164

Robert W. Butler - Ulysses KS

B65D 3336, B65D 7730, B65D 2508

206620

Method and apparatus for producing rupturable areas in thermoplastic film wherein said film is used to make closed flexible containers or packages that are easily ruptured for the release of contents contained therein. The apparatus is comprised of a male mold portion and a female mold portion having the film interposed therebetween. Application of heat and pressure to the film by the male and female mold portions cause the plastic film to extrude outwardly from the impression area thereby forming a weakened line or area in the film by selectively reducing the thickness thereof. The film is then formed into flexible packages having the rupture area in a selected position.

4061457, Dec 6, 1977

Apr 26, 1976

5/680520

Robert W. Butler - Ulysses KS

B29C 1500

425385

Method and apparatus for producing rupturable areas in thermoplastic film wherein said film is used to make closed flexible containers of packages that are easily ruptured for the release of contents contained therein. The apparatus is comprised of a male mold portion and a female mold portion having the film interposed therebetween. Application of heat and pressure to the film by the male and female mold portions cause the plastic film to extrude outwardly from the impression area thereby forming a weakened line or area in the film by selectively reducing the thickness thereof. The film is then formed into flexible packages having the rupture area in a selected position.