Abstract: A method for tearing a thin sheet material and a tearable thin sheet material having a predetermined tear line wherein the material is corrugated along a predetermined tear line to be torn. The corrugations have at least one edge, a base and an apex and the material is torn along said edge.

Abstract: A method and apparatus for injection blow molding hollow plastic articles characterized by increased capacity due to back-to-back operations or stack molding and a rapid and efficient operating cycle. The process and apparatus includes back-to-back injection mold stations, back-to-back blow mold stations located on each side of and adjacent said injection mold stations in side-by-side relationship therewith, back-to-back ejection stations located adjacent each of said blow mold stations in side-by-side relationship, and blow cores cooperating with said injection stations and blow stations, wherein the operation of said cores is facilitated by an overlapping cycle.

Abstract: A method and apparatus for injection blow molding hollow plastic articles characterized by a rapid and efficient operating cycle. The injection mold includes a mold cavity and the blow mold is located adjacent the mold cavity in side-by-side relationship. The parison is injection molded into the mold cavity onto a core. The parison on the core is separated from the mold cavity by moving the parison on the core axially in a straight path away from the mold cavity, followed by movement in a substantially arcuate path into axial alignment with the blow mold, followed by axial movement in a straight path into said blow mold.