Abstract: A method for converting a thin-walled container to a jar with a rigid threaded neck which will accept a conventional threaded screw cap which comprises separately forming a thin-walled container and a rigid threaded neck ring and then attaching the ring to the outside of the container and the jar so made.

Abstract: A method for converting a thin-walled container to a jar with a rigid threaded neck which will accept a conventional threaded screw cap which comprises separately forming a thin-walled container and a rigid threaded neck ring and then attaching the ring to the outside of the container and the jar so made.

Abstract: This invention encompasses a process for making containers from multiple stacked billets which comprises the steps of preparing thermoplastic sheet, cutting or punching billets from the sheet, stacking two or more of the billets together, heating the stacked billets or the mating surfaces of the billets to or above the fusion temperature of the mating surfaces, where the billets adhere to each other, and thermoforming the stacked billets into containers.

Abstract: This invention encompasses a process for making multilayer containers by conventional roll fed sheet method, with minimal scrap loss, which comprises the steps of preparing a monolayer sheet of a first thermoplastic material by conventional roll fed sheet methods, cutting or punching billets from a second thermoplastic material sheet, heating the monolayer sheet and the billets to a temperature where both the sheet and the billets become tacky, placing the billets at a position on the sheet so that the billets are in a position over forming cavities in a forming mold at the time of forming, while maintaining the billets and sheet at a temperature where the sheet and billets are tacky and weld together, and forming containers from the welded billets and sheet so that the web scrap left after forming is pure monolayer sheet.

Abstract: A regrind layer which comprises polypropylene, ethylenevinyl alcohol, adhesive and inorganic mineral filler which disperses within the regrind layer to prevent delamination within the regrind.

Abstract: A process is provided for producing cigarette filters which exhibit desired adhesion properties between the filter fibers, and which may be subjected to a substantially broader operating range during a temperature melt fusion step. A crystalline propylene polymer and a second crystalline polymer are mixed together, and the blend is extruded into fibers which are then heated to a temperature above the original melting point of the second crystalline polymer and below the original melting point of the crystalline propylene polymer. The fibers are twisted and/or crimped to effectuate desired adhesion between the fibers and are subsequently formed into filter rods which display greatly increased cohesiveness.

Abstract: An apparatus and method for producing articles by stretch-forming or pressure-forming of thermoplastics in the solid crystalline phase which permits forming from a billet of given thickness articles of greater wall thickness than would be formed by stretch-forming or pressure-forming the clamped billets.

Abstract: High impact polystyrene compositions having improved melt flow properties along with good heat resistance is obtained by incorporating about 0.5 to 10 percent by weight of an oxidized polyethylene material having a molecular weight of from about 500 to about 5,000 and an acid number of between about 5 and about 50.

Abstract: Void-free thermoplastic polymer slabs suitable for conversion into articles by shaping in the solid phase are produced by a method which comprises:(a) placing deformable mold rings on a heat-transmitting endless belt at regular spacings, suitably by cementing the mold rings to the belt; and(b) forming polymer slabs by moving the belt at staged intervals to successively:(i) fill a mold ring from said melt dispensing means while the ring is resting on said belt;(ii) place said filled mold ring under compression between two heated platens at at least one station;(iii) subsequently placing said filled mold ring under compression between cooled platens at a multiplicity of cooling stations; and(iv) removing the cooled molded article, sufficiently solidified to maintain its shape, from the mold after it leaves the last of said cooling stations.