Abstract: A process and a product produced thereby, for forming rod or bar or tube stock or strip, comprising a sheath and a densified dispersion strengthened metal core. Powdered dispersion strengthened copper is put into a metal can and compressively reduced to size and density. The relationship between the tensile strength of the core when fully densified and the cold worked tensile strength of the can is important to the nature of the product.

Abstract: A method and apparatus for manufacturing a film suitable for use in lamination under heat and pressure. A plurality of resins is co-extruded into concentric annuli, the inner annulus being a polyester type resin, and at least one of the outer annuli consisting of a polyolefin based resin. The co-extrusion is carried out as the extruding die is rotated about its axis. After quenching to form a multi-layer seamless tube, the tube is collapsed and heated to a temperature suitable for biaxial orientation. An air bubble is introduced into the heated tube to expand the diameter thereof and simultaneously orient the tube biaxially by molecular orientation. The biaxially oriented tube is cooled sufficiently to retain its molecular orientation, and is then collapsed. The tube is then heated to a shrinking temperature while under controlled restraint to achieve a predetermined dimension in amount of shrinkage in the film. Finally, the edges of the shrunk tube are slit to form a pair of flat films.

Abstract: An improved book cover structure of the general type having an integral backbone and front and back covers connected to the backbone via spaced parallel score lines to enable the front and back covers to flex relative to the backbone. A backbone strip of hot melt adhesive is secured on an inside face area of the backbone. Spacer means for positioning the outermost sheets in engagement with the backbone strip are provided and comprise cover strips of hot melt adhesive secured to inside surface areas of the front and back covers adjacent to the score lines with reduced area portions of the cover strips extending across the score lines.

Abstract: A book cover structure of the type having front and back covers for binding sheets therebetween. A backbone area is joined with the front and back covers. The backbone area is provided with spaced parallel strips of hot melt adhesive with transversely extending bridge means of hot melt adhesive extending therebetween the width of the backbone area. Spaced score lines are positioned between the parallel strips under the bridges in parallel relation relative to the strips to enable the user to flex the binding along selectable score lines relative to the backbone area. The bridge means of hot melt adhesive and the strips comprise means for holding sheets in bound engagement with the backbone area. The bridge means of hot melt adhesive extend across the score lines and thus provide continuity of adhesive on opposite sides of and across the score lines.

Abstract: A delamination resistant multi-layer film comprises a core layer of vinyl alcohol polymers or copolymers such as polyvinyl alcohol or ethylene vinyl alcohol. Adhered to the core layer are one or more layers of a partially hydrolyzed vinyl acetate polymer or copolymer having functional groups in the polymer such that strong adhesion to the core layer is obtained. The core layer provides an excellent oxygen barrier, while the adjacent layers protect the core layer from degradation by exposure to water vapor. Additional layers of various polymer materials may be provided over the layers of partially hydrolyzed vinyl acetate. The film can be prepared by coextrusion techniques.