Abstract: A modular storage device is disclosed which promotes convenient and efficient storage of microfilm cartridges or a plurality of like objects. The modular nature of the construction is provided by a plurality of unitary, vertically stackable rack members, selected numbers of which can be readily stacked upon the base of the unit. Each rack member is preferably of a generally circular configuration, and includes a plurality of outwardly extending support members, with adjacent ones of the support members adapted to support one of the film cartridges. For economical manufacture, each stacking rack member is configured for minimization of material, and further configured for fabrication from "structural foam" so that further material-savings can be effected. Convenient use and economical fabrication are further promoted by the configuration of the base of the unit, which together with the lowermost one of the rack members defines a pair of bearing races.

Abstract: An apparatus and method are disclosed which greatly facilitate molding of plastic material in the form of structural foam. The invention contemplates the provision of a valve-like mixing nozzle assembly which is selectively operable to control the flow of plastic material into an injection mold. Significantly, the nozzle assembly includes a mixing turbine rotatably mounted in the flow path of the plastic material. Notably, the turbine is driven by the plastic material itself as the material is driven into the mold assembly, and thus desirably provides intense mixing of the material during injection. This mixing action can be advantageously employed for effecting dispersion and/or expansion of the blowing agent carried by the plastic material for greatly enhanced control and flexibility in molding structural foam articles.