A deforming tool having a die and prestress ring for the extrusion of a workpiece. The prestress ring being constructed so that the radial prestress exerted by it on the die in a region of transition from one to the other of two converging inner faces of the die, which together form an internal angle of less than 180 degrees, and/or in the region of a sudden transition from a low to a high value of the pressure exerted by the workpiece during its deformation radially on the die, is less than in ...

A solution of cellulose is formed by moving a premix of a tertiary amine N-oxide, water and cellulose through a thin-film evaporator using a bladed rotor under treatment conditions which specify, inter alia, an area of heated surface (1 m.sup.2 to 125 m.sup.2), a blade speed (2.5 to 8 m/sec), a pressure (25 to 100 mb) and a temperature (90.degree. to 135.degree. C.).

A flat clip or staple is manufactured from a continuous strip of flat sheet material in coil form by first stamping out intermediate portions of material between each of the blanks to be formed into a discrete staple while retaining the blanks in the continuous strip. The strip is then subjected to a second stamping process where each discrete staple is severed from the strip, formed into the required shape and the excess waste material removed from the continuous strip. The second stamping proc...

Emulsification is achieved by directing a jet of fluid along a first path, and interposing a structure in the first path to cause the fluid to be redirected in a controlled flow along a new path, the first path and the new path being oriented to cause shear and cavitation in the fluid. A hot emulsion is stabilized immediately after formation by causing the emulsion to flow away from the outlet end of an emulsion forming structure, and causing a cooling fluid to flow in a direction generally oppo...

A composite torroid forming cup for an automated torroid-forming apparatus has a molded plastic upper closure and a bottom reinforced cup section. The upper closure has a hinge pin and an upper non-stick partial torroid forming surface. The bottom reinforced cup section has a substantially rigid reinforcing subframe and a plastic outer body portion that may be molded about the subframe. The bottom reinforced cup section has a bottom non-stick, partial torroid-forming surface. A method of making ...

A forming tool has a die with a seat for receiving material to be formed, an upper punch axially movable into and out of the seat from one side of the die, a lower punch axially movable into and out of the seat from the opposite side of the die, a movable loading device for introducing the material into the seat, an impact press for subjecting the upper punch to a series of compacting impacts, a unit for supplying drive force to the tool and a control device for controlling the motion of the mov...

In order to obtain uniform pressing force applied to a workpiece by an ironing die and easily disengage the workpiece after completing plastic working for the workpiece, a forming machine for performing the plastic working for the workpiece has a base pedestal, a forming punch provided on the base pedestal, and an annular ironing die arranged over the forming punch. The forming punch comprises a main punch body, six punch collets to be engaged with the main punch body and separated from each oth...

The invention relates to apparatus for use in a process in which a layer is formed on a surface of a workpiece and then forced into underlying voids. The apparatus for applying elevated pressure to the workpiece 1 comprises a chamber 103 (which includes a workpiece support 109a) means 108 for flooding the chamber 103 with liquid to immerse a workpiece 1 on the support 109a and means for applying a pulse of elevated pressure to the liquid and hence the workpiece. These means may include a liquid ...

A method of forming a solution of a solid includes the steps of: (1) forming a dispersion which comprises (a) a liquid, (b) the solid dispersed in powder form and (c) a polymeric binder dissolved in the liquid, and (2) mixing the dispersion with the solvent under conditions such that the powder dissolves in the solvent. If a solution prepared by this method is allowed to dry out, the polymeric binder binds the powder and thus suppresses dust formation. The method has particular application to so...

A forming material for the fabrication of appliances for fixing, supporting, correcting and holding human bodies, characterized by a main forming material body including a quantity of granulated materials each coated with a moisture-curable urethane prepolymer contained within a water-permeable material container, the main forming material body being hermetically enclosed in a moisture-impermeable material container, wherein the moisture-curable urethane prepolymer and the water-permeable materi...