Abstract: This invention is concerned with an improved construction of resin pellet producing machine so adapted that a length of resin material extruded in a circular shape through a die of an extruding means is cooled down by a quantity of cooling water jetted forth from a cutter nozzle and at the same time cut continuously to form a plurality of resin pellets thereby to make it unnecessary to appeal further to a cooling water tank.

Abstract: This invention concerns thermoplastic polyester molding compositions containing iron oxides, particularly Fe.sub.2 O.sub.3 which compositions exhibit markedly reduced heat up times and are especially useful in molding operations such as blow molding of beverage bottles. The polyester polymer may have incorporated therein by copolymerization certain anthraquinone dyes having functional groups which condense during polymerization into the polyester chain. The dye moieties are thermally stable at the polymer processing temperatures and are colorfast and non-extractable from the polymer.

Abstract: Novel precipitated silicon dioxide abrasive compositions which can be incorporated into therapeutic toothpaste compositions containing both soluble fluoride salts and soluble phosphate salts are disclosed. The abrasive comprise low structure precipitated silicon dioxides which have been reacted with about 10 to 300 parts per million alkaline earth metal ion, particularly calcium. Reaction with the alkaline earth metal ion minimizes abrasive interaction with the fluoride ion source in therapeutic toothpaste. Also provided are methods for preparation of the novel silicon dioxide abrasives and resulting toothpaste formulations containing such abrasives.

Abstract: A blank is formed out of plasticizable, heated plastic by means of an extruding-type material supply head. A somewhat lenticular profiling of the blank is obtained by appropriately controlling a closing member of the material supply head, which is built as a valve cone. When the closing member is closed off against the lower edge of a tube part of the material supply head, the blank is pinched off from the material supply. A flow of air emerging from a ring nozzle serves to ensure complete severance of the blank from the material supply head. After that has been accomplished, the blank enters an open shaping cavity of a die by free fall. By further movement of the die, which is located on a rotary table, the die removes itself from the permanently located material supply head, so that the blank lying in the cavity can be pressed into a molded article by a stamp. Cooling off too much in certain locations on the blank is prevented by the free fall of the blank into the shaping cavity.

Abstract: Green brick newly formed by pushing a slug through a wire cutter, have their longitudinal edges shaped by means of a plurality of rollers positioned above and across the path of conveyance of the bricks so that each roller simultaneously engages the adjacent edges of two adjacent bricks. The shape imparted to the brick edges is governed by the shape of the peripheral portions of the rollers. The rollers are mounted on a shaft at fixed locations along the shaft in alignment with the wires of the wire cutter. Before operation the locations of the rollers along the shaft may be adjusted through spacers in order to adapt the rollers to different sizes of bricks. The roller mounting shaft may be adjusted in a vertical plane towards or away from the conveyor path to adjust the depth of the rollers for a specific operation or to sufficiently raise the rollers away from the conveyor path where they may be kept idle when not in use.

Abstract: A deep stretch forming process for producing low distortion, biaxially oriented, heat set, hermetically sealable hollow containers of high molecular weight saturated linear polyesters comprised of deep stretching an injection molded heated contoured preform into a hollow die by means of a heated forming plunger, annealing or heat setting and then cooling the formed hollow container prior to said containers removal from said die.

Abstract: A deflation-proof pneumatic tire comprises a casing and a substantially void-free, preferably oil-containing elastomeric filling material. The tire casing is injected with a combination comprising a polyol, an organic polyisocyanate and water, in amounts and under conditions sufficient to produce carbon dioxide and form a polyurea-containing polyurethane elastomer in which the carbon dioxide is dissolved in the elastomer, thereby providing a substantially void-free filling material. The formulation permits the addition of a substantial amount of extender oil while retaining an acceptable level of hardness.

Abstract: A method for centrifugally casting thermosetting plastics and the like, this method including the following steps of assembling and closing a casting mold having an upper portion and a lower portion; placing a prepared dividing hub onto and over a plurality of drive pins provided on a spinner carried by a stationary base, said dividing hub having a reservoir engaging a plurality of prepared closed casting molds onto and over a like number of nozzles, each of said nozzles extending radially from the sides of said dividing hub; placing and tightening a clamping means around the perimeter of the casting molds; pouring a pre-measured quantity of the thermosetting plastic into said reservoir in the dividing hub; moving a vacuum hood to the stationary base and with gasket means forming a vacuum chamber with said stationary base; evacuating the now closed vacuum chamber; forming and providing a conduit connecting an extreme tip of each of said nozzles with a bottom portion of the reservoir and then spinning the cast

Abstract: Oxide refractory materials (for example, alumina-zirconia mixtures) can be cast to have an extremely fine crystal structure by casting them onto a non-reactive, non-melting particulate solid cooling media of a material other than that of the oxide refractory material (for example, steel spheres having a size ranging from about 5 to about 60 mm). By using steel spheres as the cooling media, the spheres can be removed from the solidified material with a magnet. The solidified material, when crushed and graded, has exceptional utility as an extremely tough abrasive grain.

Abstract: The invention is a flexible mask for use in charging a flowable material into selected cells of a honeycomb structure and is of particular utility in charging a sealing material into the ends of selected cells of such a structure during fabrication of solid particulate filter bodies and other selectively plugged honeycomb structures. The mask has a central body with a set of openings extending therethrough which allow passage of the flowable material through to the selected cells and a second set of protrusions extending from one of the surfaces of the mask which are used to align the mask to the end face of the structure and which extend into and sealably cover the cells which are not to receive the flowable material. The mask may be formed from a polymer, preferably an elastomer, using any of three disclosed die apparatuses.

Abstract: A method of forming a component for a high-temperature secondary electrochemical cell having a positive electrode including a sulfide selected from the group consisting of iron sulfides, nickel sulfides, copper sulfides and cobalt sulfides, a negative electrode including an alloy of aluminum and an electrically insulating porous separator between said electrodes. The improvement comprises forming a slurry of solid particles dispersed in a liquid electrolyte such as the lithium chloride-potassium chloride eutetic, casting the slurry into a form having the shape of one of the components and smoothing the exposed surface of the slurry, cooling the cast slurry to form the solid component, and removing same. Electrodes and separators can be thus formed.

Abstract: A novel collagen condom consists of isotropically-strong, crosslinked, regenerated fiber collagen. A method of preparation involves the steps of at least twice dipping a mandrel into an acidic collagen dispersion; slowly removing the mandrel under spinning conditions; neutralizing and drying the membrane between dippings; crosslinking the finally dried membrane while on the mandrel and removing the membrane from the mandrel.

Abstract: An extrusion process for the manufacture of insulated winding wires. Part crystalline thermoplastic polycondensates with crystallite melting points above 170.degree. C., preferably above 250.degree. C., are extruded. Polyethylene terephthalate is the polycondensate of choice. These are filled with 5-15% by weight titanium dioxide. The result is the avoidance of fissure formation.

Abstract: Processes are disclosed for severing a plurality of hollow fiber membranes comprised of thermoplastic material which membranes are arranged in the form of a bundle and also sealing the bores of the membranes in an essentially fluid-tight manner. The severing and sealing of essentially all of the hollow fiber membranes in the bundle can readily be accomplished without any significant decrease in membrane performance or strength. The severing and sealing of the hollow fiber membranes is accomplished by passing a heated member through the bundle in a path transverse to the orientation of the hollow fiber membranes wherein the temperature of the heated member is above the melt temperature of the hollow fiber membranes. Advantageously, the hollow fiber membranes which are severed in accordance with this invention can have a significant void volume and may be anisotropic with a thin, dense skin.

Abstract: To ensure that a socket formed on a pipe-end in plastically deformable condition is in no part thinner than the pipe material out of which it is made, the pipe-end is first enlarged in diameter and encased within a contour die formed as envelope for the external shape required of the socket. The enlarged pipe-end is then longitudinally compressed to thicken it and internally formed so as to smooth the internal surface of the pipe-end and impose on it the internal shape and dimensions required of the socket. The required socket shape preferably includes a circumferential groove to house a resilient sealing ring.

Abstract: An improved method for producing a ceramic resistor is disclosed. The method comprises the steps of charging ceramic batch into a longitudinally extending die, pressing the batch in the die between opposing plungers, removing one plunger from the die, ejecting the blank by moving the other plunger relative to the blank and firing the blank. The improvement constitutes imparting rotational motion to the removable plunger as applied pressure thereon is being released to remove the plunger from the die, whereby the surface of the plunger in contact with the blank separates therefrom without sticking.

Abstract: A process for producing a highly porous and extremely hard resinoid rotating disk grindstone that withstands rapid rotation comprising the steps of forming uncalcined unit grindstones by inserting 1-3 glass mesh cloths into a layer of polishing powder every 2-10 mm in the grindstone; press molding this reinforced composition; and these unit grindstones being laminated and united by calcination. The grindstone obtained using this process is highly porous compared to ordinary composite grindstones. Its bulk specific gravity is 2.2 or below and the degree of bonding indicates great hardness (0.25 or below). Also, its grinding capacity proved to be about 2-3 times that of grindstones formed using the same materials, and about 1.3-1.8 times that of commercial high-performance products.

Abstract: A cup shaped or cylindrical thread protector, having circumferentially spaced, internally projecting lugs, is formed by injection molding of a thermoplastic resin into a female mold cavity having a smooth cylindrical interior and having a male mold member fitting therein and cooperable therewith to define a cup shaped or cylindrical cavity. The male mold member has a plurality of recesses of a size and shape operable to produce said lugs in the molded thread protector produced therein. When the thread protector is molded, the male mold member is rotated about its axis sufficiently to compress said lugs into the cup wall thereof at a time after the thermoplastic has solidified but before it has cooled and is then pulled from within the cup shaped member.

Abstract: This invention relates to an apparatus and a process for forming building blocks by consolidating a mixture of cement and fibrous material. The process involves placing a charge of the mixture into a mold, compressing the mixture within the mold, inserting rotors into the mixture within the mold to consolidate and displace the mixture while forming hollow cores through the formed block, and removing the rotors from the formed block and the block from the mold. The apparatus includes a mold, a mold cover, means that apply pressure to the mold cover to compress the material placed within the mold rotors, means for spinning the rotors as they are lowered into and raised from the mixture by raising and lowering means. The block is formed on a removable pallet resting on lips within the mold. The pallet defines apertures substantially aligned with the rotors; the apertures allow for release of pressure when the rotors are withdrawn from the formed block.

Abstract: Process and device for the forming, on the end of a pipe made of a thermoplastic, of a coupling piece possessing an undercut annular groove intended for receiving an annular seal, according to which process and device the coupling piece is initially preformed by means of a forming core which possesses an annular rib for forming the annular groove, the core then being withdrawn from the partially cooled coupling piece by virtue of an elastic deformation of the part possessing the groove, by means of the rib of the forming core, and this part being kept at the elastic deformation temperature, and according to which this part is subjected to a postforming operation, before it has completely cooled, by means of a postforming ring.