Abstract: An open end parison preform is stretched longitudinally, expanded slightly with preblow fluid, and pinched shut with a contoured sealing member to form a bead along the sealing seam.

Abstract: The specification and drawings disclose a method and apparatus for rolling plural metal strips simultaneously to form thinner metal strip or foil. The method allows use of larger diameter rolls and simpler roll supporting structure and mill controls than heretofore possible in foil forming. The disclosed method contemplates the provision of a plurality of metal strips which are then bonded together in juxtaposed relationship with a thin layer of matrix material which substantially completely covers the opposed faces of the strips to form a composite comprising alternate layers of metal strip and matrix material. Thereafter the composite is rolled to reduce the strips to the desired thickness. Subsequently, the bond between the strips is destroyed and the strips are separated. According to certain embodiments, strong or low ductility metals can be formed into foils by bonding them in the central portion of the composite. Weaker or more ductile metals form the outer portions of the composite.

Abstract: Plastic is cleanly severed between closely adjacent inner sections of radially operable blow molds in a rotary molding machine during mold opening by means of a wiper blade on the trailing face of the inner section of one mold angularly projecting toward and having its rear edge engaging the forward face of the next succeeding inner mold section, each such inner section being spring mounted and arranged because of the mold-opening cam configuration, to spring outwardly such that the rear edge of the blade slides along the forward face of the succeeding mold to consistently shear the plastic between such edge and such forward face.