Abstract: A process for producing a cylindrical reinforcing fibrous molding by sealing openings at opposite ends of a porous cylindrical disintegratable mold, immersing the mold into an aqueous solution of a molding material containing reinforcing fibers and an inorganic binder, and depositing the molding material onto the outer peripheral surface of the mold by applying suction within the mold to form a molding blank; pressing the molding blank against the mold to adjust the shape of the molding blank; disintegrating the mold to remove it from the blank; and heating the molding blank to partially bond the reinforcing fibers with the inorganic binder.

Abstract: A method of repairing an eroded refractory wall pierced by one or more openings using a ceramic welding technique. A member of shape substantially complementary to the desired shape of the repaired opening is placed into each opening so that the member projects from the refractory wall by an extent at least equal to the local depth of erosion. Such complementarily-shaped member is so composed that it is adapted to withstand ceramic welding temperatures. A desired refractory repair mass is built up, by ceramic welding, adherent to the eroded wall and surrounding the complementarily-shaped members(s) while leaving its end or their ends exposed, and the complementarily-shaped member(s) is or are thereafter removed from the repaired openings(s). Such complementarily-shaped member may, for example, be of refractory carbon or of steel, such as stainless steel. Such a steel member may be tubular for the circulation of coolant.

Abstract: A method of sealing a concrete joint formed between a pair of concrete castings by creating an injection hole wherein a removable frame member can be attached to the bottom surface of the first concrete casting so as to form obtuse angles with the concrete casting surface. The other concrete casting is then cast around the frame member. The frame member is then removed to form the injection hole of the desired configuration, and sealing material can then be inserted into the injection hole for feeding into, and sealing of, the joint.

Abstract: In casings for switch cross ties, the bottom plate 3 serves at the same time as a pattern for the position of the construction components. As a rule, a new casing is prepared for each series of cross-ties type. In small series with various positions of the construction components it is economical to use the bottom plate repeatedly. This is done by providing the bottom plate, prior to its insertion in the casing, with holes (A,B,C) for several types of finished parts, by provisionally closing the unnecessary holes by suitable means and by finding the combination of holes required for the production of a certain type of finished part through a certain searching procedure and freeing them of their provisional closing means.

Abstract: A multilayer molded article including a resin body and a skin material having little or no wrinkles or breakage in the skin material is molded by molding a resin melt and the skin material in the mold while removing the air trapped between the skin material and the mold.

Abstract: A method and apparatus for producing an article, by covering at least a portion of a microwave heatable former with a liquid-containing material, applying microwave radiation to heat the former so as to leave a dry solid coating on the former, and effecting relative separation between the former and the dry solid coating so as to produce the article.

Abstract: In accordance with the present invention, there is provided a process for producing polytetrafluoroethylene (PTFE) resin molded articles, wherein an unsintered PTFE resin paste extrusion molded article as extruded from an extrusion machine and inserted into a sintering mold having an inside diameter slightly larger than an outside diameter of said unsintered PTFE resin molded article is sintered at a temperature higher than a melting point of the PTFE resin. In another aspect of the invention, PTFE resin molded articles are produced by a process wherein an unsintered PTFE resin paste extrusion molded article immediately after being extruded from an extrusion machine is sized by means of a sizing die, and the unsintered PTFE molded article thus sized is inserted into a sintering mold having an inside diameter slightly larger than an outside diameter of said unsintered molded article, followed by sintering at a temperature higher than a melting point of the PTFE resin.

Abstract: In connection with a device for casting lead grids for electric battery plates, a highly porous ceramic mold lining, preferably of zirconium oxide, is prepared by flame-spraying. Such a lining can include a thin surface coating on a profiled, basic metallic mold or a separately prepared insert plate which is retained to a metallic mold molder. The ceramic surface coating may be accurately formed in place, or may be formed as an over-spray which is then reduced in thickess. Formation of the surface coating may be accomplished by placing masks on the basic metallic mold during the flame spraying, for those areas of the grid which tend to accumulate material, or by adjusting an initially coarse profile of the ceramic layer to the exact profile of the casting by a material-removing treatment.

Abstract: A formwork for a draft tube which includes ganged precast forms, each precast form corresponding to a curved segment of the draft tube. The precast forms are molded with continuous side plates extending thereabout and anchored in the precast concrete form and projecting beyond the surface opposite to the contact surface to provide a flange. A fastening means for attaching adjacent forms with a space therebetween to allow for stripping. A method includes determining the outline of the inner surface of the draft tube and dividing it into segments and preparing molds to make precast forms corresponding to each segment. The precast forms are assembled and shored to provide the draft tube ganged formwork, and concrete is poured about the draft tube formwork and is cured. The precast forms are stripped from the set concrete structure and reused in another draft tube formwork.

Abstract: Use a material which has a coefficient of thermal expansion greater than silicon nitride and does not react with silicon nitride under hot pressing conditions either to fabricate or to coat hot-pressing die plates suitable for densification of silicon nitride. The die plates separate cleanly from the silicon nitride thereby allowing preparation of near-net shapes having complex geometries, but without post densification grinding or machining.

Abstract: A plastic mold (A, B) for rotational molding are disclosed. The plastic mold, used in lieu of a conventional metal mold, is constructed from a fiber (52) reinforced thermoset plastic resin (50) having a heat distortion point above the melt point of the thermoplastic polymeric material from which an article is molded. Metal (64, 70, 74) or other dissimilar material may be used to provide different coefficients of heat transfer at preselected portions of mold (A, B). The entire mold may include a thermal coefficient modifier to increase the heat transfer rate of the mold uniformly over the entire mold in addition to the preselected portions.

Abstract: A method of making a positive model of a tooth or gum involving the steps of pouring hardenable positive impression material into a negative impression of the tooth or gum comprising a curved, vinyl polysiloxane composition, and hardening the positive impression material, wherein the improvement involves applying finely divided palladium over at least part of the surface of the negative impression that will contact the positive impression material before pouring the hardenable positive impression material.

Abstract: A process for producing a polycarbonate molded article having a low dust level from a polycarbonate resin in the form of a powder or pellets by injection molding using an injection molding machine. The injection molding machine includes a cylinder whose inner circumferential wall is made of a corrosion- and abrasion-resistant alloy from alloy components (1), (2), or (3) given below and a screw part made of a steel having a metal coating formed of hard chromium plating or hard nickel plating or formed of titanium carbide or tungsten carbide, or is made of SUS420, SUS440, Hastelloy C, or a steel of alloy component (4) given below:Alloy components (1):C: 0.5-1.5 wt%Si: 1.0-2.0 wt%B: 0.5-2.5 wt%Ni: 10.0-20.0 wt%Cr: 20.0-30.0 wt%W: 10.0-20.0 wt%Cu: 0.5-2.0 wt%Remainder: Co and unavoidable impurities,Alloy components (2):Ni: 0.0-2.0 wt%Cr: 5.0-15.0 wt%Fe: 0.0-1.0 wt%Mn: 0.1-2.0 wt%Si: 0.2-4.0 wt%B: 2.0-4.0 wt%Remainder: Co and unavoidable impurities,Alloy components (3):Cr: 5.0-10.0 wt%Co: 5.0-40.0 wt%Fe: 0.0-10.

Abstract: A method and apparatus (20) for batch molding open-cell soft polyurethane foam within a mold (22a, 22b, 104) is provided by introducing into a mixing chamber (26) of a mixing pot (24) a highly activated polyol component and an isocyanate component which are mixed and permitted to foam to provide upward expansion in a viscous state through an upper outlet (28) by free rise that fills the mold (22, 104). Such batch molding provides "one age of foam" that enables molding to be performed which was not previously possible. Both a rigid mold (22) and a flexible mold (104) can be utilized. The mixing pot (24) includes a mixer 38 preferably embodied by a rotatable screw (74) that is moved axially to purge the mixing chamber (26) of foam after each cycle.

Abstract: Gasket used in a fabrication method, wherein a methylmethacrylate prepolymer or a mixture of unsaturated monomers, whose main constituent is methylmethacrylate, or the unsaturated monomer or monomers themselves is (are) introduced into a mold comprised of two parallel plates separated by said gasket, and the mold is brought to a temperature sufficient to complete or carry out the polymerization. The gasket consists of a core of plasticized poly(vinylchloride), said core being sheathed by a thin layer of thermoplastic polymers chosen from among propylene polymers and saturated polymers, said thermoplastic polymer being capable of retaining its elasticity at temperatures ranging from 20.degree. to 120.degree. C. and having a melting or softening point higher than 115.degree. C.

Abstract: A biaxially-oriented polymer film having dual-sided appearance, i.e., the color of each side is chromatically different. Also a method for making such films.

Abstract: A process for producing improved gypsum models and molds of high duplication accuracy is provided. In the process, bundles of carbon fibers of specified length and amount having a sizing agent deposited thereon are treated to remove the sizing agent from the carbon fibers which are then separated into single fibers in water. A major part of hemihydrate gypsum (CaSO.sub.4.1/2H.sub.2 O) powder is then added to the carbon fibers dispersed in water to obtain a gypsum slurry having the carbon fibers uniformly dispersed therein. The slurry is then cast to obtain the models or molds.

Abstract: A method for making plastic tooling by forming a surface coat over a model of the article to be made. While still in a tacky condition, the surface coat is sprinkled with sand. After the surface coat is cured and has adhered to the sprinkled sand, the surface coat is wet with a laminating resin. Then a sand and epoxy mixture is poured into the core box to form the tool. Another version of the method includes the steps of disposing a vacuum tube into the sand-epoxy core and closing off the open side of the core box through which the core mix was tamped. The surface coat is applied around the model so that the cavity in the finished core is suitable for vacuum-forming an object without forming the conventional vacuum holes.

Abstract: A process for the production of optionally foamed moldings having a compact surface by the reaction in closed molds of a mixture of(a) organic polyisocyanates,(b) compounds containing isocyanate-reactive groups and having a molecular weight of 62 to about 10,000 and(c) mold release agents based on salts of (i) saturated or unsaturated aliphatic or cycloaliphatic carboxylic acids or carboxylic acid mixtures containing (on a statistical average) at least 8 carbon atoms per molecule and (ii) tertiary amines,characterized in that the release agents (c) used are salts in which the amine component (ii) is based on tertiary monoamines or mixtures of tertiary monoamines corresponding to the following formula ##STR1## in which R.sub.1 represents a saturated or unsaturated aliphatic hydrocarbon radical containing at least 12 carbon atoms and R.sub.2 and R.sub.

Abstract: A method of making a solid core locatable between a wheel rim and a tire fitted to the rim, includes introducing a foamable composition into a mould cavity having a substantially inflexible mould surface. The cavity is suitably shaped so that a core locatable between a wheel rim and a tire fitted to the rim can be moulded therein. The composition is allowed to foam, thereby to fill the mould cavity. Air and excess composition is allowed to vent from the cavity via an elongate vent slit extending along a major portion of the cavity. The foamed core thus moulded in the cavity is removed from the cavity on the composition having set at least partially.

Abstract: An unsaturated compound having a vinyl or vinylidene group is rapidly in-mold polymerized by mixing the unsaturated compound containing a polymerization initiator and the unsaturated compound containing a polymerization accelerator, pouring the mixture into a mold cavity and polymerizing the monomer for not longer than 30 minutes.

Abstract: A piece of furniture having an upstanding back or arm rest is made by first temporarily securing wire mesh to a frame, then plastically deforming and shaping the mesh on the frame to form the upstanding rest with a three-dimensional shape, and then applying to the shaped mesh a layer of glass-fiber web, soaking same with a hardenable resin, and curing the resin-soaked web until it hardens. At least one anchor is fixed to the cured resin-soaked web and at least one further layer of glass-fiber web is applied to the cured web, soaked with resin, and hardened until the anchors are securely fixed therein to form a free-form shell. The wire mesh is then stripped from the shell, which is trimmed and otherwise finished, padded, and covered. The covered shell is then secured by the anchors to a rigid base. The padded shell is covered with a fine hide having a thickness of at most about 1 mm. A layer at most 6 mm thick of fine padding is adhered to the inside surface of the hide before it is put over the padded shell.

Abstract: The specification discloses a new method and apparatus for treating extruded TEFLON (fluoropolymer) tubing to significantly improve its dimensional and optical characteristics. Diameter tolerance is .+-.0.0002, concentricity rises to 95%, and optical clarity rises to the theoretical transmittance of the material. The tubing is first cleaned, and then heated to a transition temperature above 150.degree. C. to soften and further homogenize the tubing. The tubing is then drawn through a polished diamond die and then rapidly cooled. The cooled tubing may be further stabilized by an annealing step. Both a batch mode and a continuous mode of operation are disclosed.

Abstract: A method and equipment for processing a thermoplastic polymer wherein at least a portion of the surfaces which contact the thermoplastic polymer, while said thermoplastic polymer is in a heat plastified state, comprise boron carbide.

Abstract: A method of molding a generally hollow front triangle for a bicycle frame of composite materials, such as heat curable structural resins. Layers of the composite material are shaped to form a front triangle shell and this shell is compressed against a mold using at least one inflatable bladder routed to the outside through a passageway passing through a modified bottom bracket sleeve or a modified head tube sleeve.

Abstract: A novel manufacturing process of mold containing continuous holes and used for filter materials, gas dispersive materials, and mold materials. By this invention, the epoxy resin mixture including an epoxy compound having one or more epoxy groups in each mole, a hardener which reacts with and hardens the epoxy compound, emulsifiers, water or water-surface active agent, and fillers respectively is used as the molding material. As the emulsifier, at least two kinds of three different kinds of nonionic emulsifiers of 4-8, 8-17, and 11-15.6 HLB respectively are used together.The molding material is cured to a desired shape to prepare a mold containing continuous holes and for molding, conventional methods such as hardening after casting, for example, are adopted.

Abstract: On extrusion of thermoplastic melts, flow anomalies occurring in the extrusion dies can be decisively reduced when dies are used whose surfaces coming into contact with the melts are provided with a thermally applied spray coating.

Abstract: A method and apparatus for the polymerization cast molding of lenses from hydrophilic gels. A hydrophobic liquid which is essentially immiscible with a hydrophilic polymerization mixture is introduced into a mold having a hydrophobic surface, followed by dosing of the hydrophilic monomer mixture which is allowed to polymerize to form a drop which is pressed, while polymerizing, into the mold with a punch having a hydrophobic molding surface. The polymerizing monomer mixture is maintained under the pressure of the punch until the end of the polymerization. Any overflow of the two liquids is allowed to escape between the mold and the punch. The apparatus comprises a concave mold with an inner hydrophobic, rotation-symmetrical surface, and a punch with a hydrophobic molding surface which when placed in relationship to the mold has an overflow space formed between the mold and the punch.

Abstract: Polymeric articles made of, for example, polyethylene and copolymers of ethylene, are made more adherent to paint or dyes by first nitrating the polymer, then shaping or forming it in a mould having a polar surface and finally, cooling it in contact with that surface, or extruding a nitrated polymer onto a polar surface and allowing to cool in contact with that surface.

Abstract: A method of making a foam injection molded article is disclosed wherein corrosion of the mold element is significantly reduced or substantially eliminated. The method comprises dispersing effective amounts of a primary chemical blowing agent of sodium borohydride and an activation system of sodium bicarbonate/citric acid mix into a polymer resin to form a mixture. The mixture is then heated whereby the activation system releases water and the sodium borohydride reacts with the water to produce hydrogen gas. The mixture is subsequently injected into a mold to obtain expansion of the polymer resin to form the foam article. The invention also comprehends a corresponding chemical blowing agent composition.

Abstract: A process and an apparatus obtain plastic molded objects according to a technique which consists of introducing the plastic into a silicone elastomer mold, then inserting this mold into a high frequency device comprising a turntable "carrousel", a series of high frequency heating presses and a cooling device.The process is characterized by the introduction of plastic into one end of the mold in the form of liquid plastisol under low pressure, i.e., less than 1 Magapascal. The apparatus employs a carrousel, a mold having two male inserts and resting on the carrousel, vacuum-creating means and plastisol injection means.

Abstract: Detergent bars (soap or non-soap) are stamped or imprinted using a die or dies having a modulus of elasticity in the range 5.times.10.sup.5 to 1.times.10.sup.7 Nm.sup.-2. This gives reduced adhesion of detergent to die, reduced die-blocking and consequently reduced marring of bars. Preferably each such die has a facing layer of elastomer so as to achieve the desired low modulus of elasticity which preferably is distinctly less than that of the detergent.

Abstract: Molds for injection molding are produced by providing a primary mold core, coating the primary mold core with a water-resistant coating layer, applying on the water-resistant coating layer a separating layer, spraying a metal shell on the separating layer, arranging a rear filling on the shell so as to form a tool part, and supplying water to the water-soluble layer so as to remove the tool part.

Abstract: A process for producing a microcellular cast resin product, by casting a water-in-oil emulsion of polymerizable components which will gel and partially polymerize by an exothermic reaction, and placing the partially polymerized casting in a fluid medium maintained at a temperature and pressure such that evaporation of water and monomers is inhibited but sufficient to promote complete polymerization while retaining dispersed water within a microcellular structure. The water content of the emulsion can range from about 1% to about 90% by weight, and the microcellular structure may be either the open cell or the closed cell type.

Abstract: A soft contact lens made of a hydrated polymer with an overall water content in the range of 40% to 90% by weight has a water content at the front surface of the lens which is at least 3 percentage points higher than the water content at its rear cornea-contacting surface, as measured by use of an Abbe refractometer. The lens is made from a monomer capable of polymerizing to form a clear transparent partially swollen hydrogel polymer and a diluent forming from 15 to 50% by weight of the moulding mixture, which is moulded between a convex and a concave mould member of different materials chosen so that the lens has the different water contents at its surfaces, as mentioned above.

Abstract: Forming method of producing thin-walled finished articles such as cups of expanded resin including steps of: heating beads of expandable thermoplastic resin in a mold cavity of a preforming mold, causing the beads to be expanded and fused together to produce a preformed article; transferring the preformed article as pressurized in an atmosphere under pressure to a finish-forming mold; and compressively forming the preformed article with the finish-forming mold.

Abstract: A system for molding elongated ribbon-like products from thermoplastic materials utilizing a plurality of molds which are moved in tandem along a production line. As the molds are moved along the line at successive stations they are, while open, thermally adjusted to a temperature suitable for forming the product to be molded and then a ribbon of plastic is deposited in them. They are then closed and cooled and reopened and the molded product removed. The system utilizes only enough molding pressure to assure distribution of the plastic to all parts of the mold cavity and shaping of the molded product to the geometric design of the mold. The system includes a transfer means for the molds which returns the emptied molds for recycling through the molding process.

Abstract: A process is disclosed for forming at least one thin substantially uniform fluid coating comprising polymeric film forming material on a cylindrical mandrel, solidifying the fluid coating to form a uniform solid coating and separating the uniform solid coating from the mandrel. The process may comprise forming at least one thin substantially uniform fluid coating comprising polymeric film forming material around a cylindrical mandrel, the mandrel having a larger mass or lower thermal conductivity than the polymeric film forming material and a critical surface tension greater than the surface tension of the fluid coating, solidifying the fluid coating to form at least one thin substantially uniform solid coating comprising the polymeric film forming material around the cylindrical mandrel, heating both the uniform solid coating and the mandrel to a temperature at least above the apparent T.sub.

Abstract: The invention relates to a high molecular weight polyolefin part, particularly for an articular prosthesis and to its production process by shaping in a closed mould. This part, which has a friction surface, has a structure such that the polyolefin chains are oriented parallel to the friction surface, at least in the zone of the part located below or flush with said friction surface. This orientation is obtained during the shaping of the blank of the part in a closed mould having a metal belt, a hemispherical block and a mobile punch, as a result of the choice of shaping conditions, particularly the shaping temperature and the length/transverse dimension ratio of the blank.

Abstract: There is disclosed a flexible mandrel for making tubular products comprising an elastomeric portion surrounding a reinforcing cable comprised of wire cables twisted around a non-metallic core. There is also disclosed a process for making a flexible mandrel and a process of making a hose using the flexible mandrel.

Abstract: A method of preparing a template for a product from a sample of the product. The ultimate template is either larger or smaller in size than the sample. Initially, a mixture of liquid rubber and a curing agent is prepared. The sample is then covered with the mixture and the mixture is permitted to harden to form a temporary mold. The sample is then removed from the mold to form a cavity, and the size of the cavity in the mold is altered to either increase or decrease its dimensions. Finally, a hardenable material, such as an epoxy resin, is poured into the mold to form the template. If an enlarged template is to be formed, the size of the cavity of the mold is increased by immersing the mold in an organic solvent bath. If the size of the mold is to be decreased, an organic solvent is added to the mixture before formation of the mold, and after the mold has been formed, it is heated to shrink the size of the mold.

Abstract: Molds or auxiliary molds for thermoforming a synthetic resin, said molds having a rigid main part connected surface-to-surface to an elastic layer having a smooth, continuous, matte surface which is more elastic than a softened resin with which it is to be contacted; devices for thermoforming comprising one or more of such molds; methods for thermoforming employing such molds and devices.

Abstract: Colored polyester pictures containing therein a design depicted by an integral raised beaded structure on a smooth, polished background are prepared by a method in which the polyester is cast on specially prepared glass molds. The glass mold is prepared by transferring a line drawing or design to a piece of glass covered with one-sided tape. Removal of the tape where the line drawing appears to expose the underlying glass, followed by blasting, results in a channel or gulley in the glass which, following casting becomes the beaded structure of the picture. The use of pigmented polyester for casting and painting the finished cast results in decorative artwork.

Abstract: A method of moulding composite materials in which prepregs of resin impregnated filaments are interposed between a shaped partially contained polytetrafluoroethylene body and a die. The assembly is heated to cause the polytetrafluoroethylene body to thermally expand and compress the prepregs against the die so that the prepregs are moulded to the shape of the die and the resin in the prepregs cures.

Abstract: A fluoroelastomer composition comprising (a) a fluoroelastomer comprising vinylidene fluoride units and units of at least one other fluorine-containing monomer copolymerizable with vinylidene fluoride, said monomer containing 2-7 carbon atoms and containing at least as many fluorine atoms as carbon atoms, and (b) a phosphonate accelerator for curing the fluoroelastomer having the formula: ##STR1## where R, R.sub.1 and R.sub.2 independently represent an alkyl radical of from 1-8 carbon atoms, a phenyl radical, a phenyl radical substituted with an alkyl group of 1-4 carbon atoms or an aralkyl radical having from 7-13 carbon atoms such fluoroelastomer composition substantially reduces mold fouling during curing.

Abstract: A body panel joint finishing method to produce a finished body panel joint by molding a bead directly to a vehicle body in a single operation without any need for secondary processing to remove excess materials. The method utilizes a foamable plastic as the bead forming material to provide greatly improved sealing property for moisture prevention in the gaps of the sheet metal body panel joints.

Abstract: An improved mold, apparatus and method for injection molding is provided. The apparatus is of the type which includes a means for opening and closing a multi-part injection molding mold, means for supplying molten material under high pressure into the mold cavity when the mold is closed and means for removing articles molded in the cavity on cooling. The improvement is provided by a new multi-part mold which is made up of at least two parts. Each part of the mold comprises a mold block portion having a ceramic mold cavity insert. The ceramic mold cavity inserts define the walls of the mold cavity when the mold is closed. Each mold cavity insert comprises a shaped ceramic body having a mounting surface adapted to fit under compressive stress throughout the entire molding operation within a mounting cavity of the mold block portion.

Abstract: The invention relates to a method for the manufacture of implantable electrodes of vitreous carbon with an electrode head and an electrode stem, by pyrolysis of cross-linked synthetic resins. Electrodes manufactured in accordance with such a method exhibit high surface quality. In accordance with embodiments of the disclosure, the electrode stem is manufactured in the form of a blank by hardening a resin precondensate, then the electrode head is cast onto the blank in a casting mold, using a resin precondensate, and is cross-linked. Subsequently hardening takes place and then the synthetic resin is converted into vitreous carbon by pyrolysis, and the electrode obtained in this manner may, if desired, be activated to provide the electrode with a microporous surface structure.

Abstract: A method of manufacturing a shoe which comprises forming a foamed outsole in a mold cavity and cementing an insole to the formed outsole during molding. The mold is made of a silicone rubber and has a deeper cavity for forming the outsole and a shallow cavity for receiving an insole. An upper with multi-colors is fabricated by cementing differently colored plastic segments and a lining cloth by high frequency sealing.

Abstract: Liquid curable resins, such as unsaturated polyester resins, unsaturated epoxy resins, polymethyl methacrylates, are cured in a mold, the casting surface of which, is made of a vinyl alcohol-olefin copolymer to produce a shaped resinous article with an improved and even surface gloss.