Abstract: A mold arranged between a pair of heater blocks for molding an optical element comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface and in contact with a corresponding heater block, and a ring member for guiding the first and second elements. The rear surface of at least one of the first and second elements has a part which is not in contact with the corresponding heater block. Also, another mold comprises a pair of first and second elements each having a molding surface for defining a cavity and an outer surface opposite to the molding surface, a first ring member for guiding the first and second elements, and a second outer ring member made of a material with a lower thermal conductivity than that of the first ring member. A molding method for optical elements is such that a glass with a viscosity of 10.sup.

Abstract: A mould assembly for moulding ice sculpture having (i) complementary mould members (1,2) of low thermal conductivity material, the complementary mould members being releasably mated together via complementary peripheral flanges (3,4) secured together by nuts (8,14) and bolts (19,11), defining an open topped mould cavity; (ii) a water impervious flexible mould liner (18) conforming to the interior of the cavity and including a split region (19) around at least part of its periphery, having mating portions, each of the mating portions having extended (20,21) lips adapted to be sealingly clamped togehter between adjacent mould members; (iii) a thermally insulating cover adapted to close the open top of the mould cavity, wherein the improvement lies in the provision of: (a) perforations (15) thorough the mould members at regions corresponding to protuberant parts and (b) providing thermal insulation (16) to the mould assembly at regions corresponding to narrow parts of the ice sculpture to decrease the rate of fr

Abstract: An injection mold for injection-molding a tubular article having a bottom at one end and opening at the other end having a cavity plate and a core which define a cavity conforming to the shape of the article when closed. A gate opens to the cavity at a portion defining the bottom of the article. The core is provided with a coolant passage for circulating coolant up to a portion near the free end surface of the core for defining the bottom of the article. The inner surface of the core defining the end portion of the coolant passage near the free end surface of the core tapering toward the gate and the coolant passage extends near a portion of the free end surface of the core opposed to the gate, and at least one rib is provided on the inner surface of the core at the tapering portion to project into the coolant passage and to extend in parallel to the direction of coolant flow.

Abstract: A mold for molding an optical disc includes a first mold member having a recess, and a second mold having a body and a plate-like sintered ceramic member secured to the body and having a flat seat surface. The recess and the flat seat surface jointly provides a mold cavity when the first and second mold members are mated together. A disc-shaped thin stamper is adapted to be seated on and detachably secured to the flat seat surface. The ceramic member is made of a ceramic material having Rockwell hardness (A-Scale) of not less than 90, so that the flat seat surface is not subjected to undue damage for a prolonged period of time.

Abstract: A molding cavity wall (10) is made in a plurality of parts of a cheap material having a high thermal conductivity, for example a thin metal sheet (10), at least one heating device (11) is applied on the wall in direct thermal exchange relation to the external surface of the wall (10), and a thermal insulator constituted by a foam (12) of highly rigid resin is applied to the wall (10) in uniform pressure transmitting relation to said wall.

Abstract: The accumulations of molten lead which correspond to the lugs and frames of molded starter battery plates can be caused to solidify at the same rate as the much thinner grids of the plates by providing a mold having inserts made from a material whose thermal conductivity is higher than that of the base material of the mold in the regions of the mold which are used to form the lugs and frames, provided these inserts are disposed as close as possible to a system of cooling channels. The ratio of the thermal conductivity of the material from which the inserts are made to the thermal conductivity of the base material of the mold should approximate the ratio of the material accumulations on the lugs and frames to that on the rest of the grid.

Abstract: A method is described for indexing a polyform block in which a metal field shaping block is cast to both the cutting tray of a hot wire cutting system and the treatment tray of a radiation therapy treatment machine. The cast metal field shaping block is automatically correctly oriented for treatment. A cooling tray for cooling the casting is also described.

Abstract: Apparatus for reducing the waste neck area in a mold of vinyl cast articles such as automotive arm rests, head rests and parts of similar construction includes a powder box of gellable material having a supply spout with its exposed outer surface area covered by a liner of heat insulating material; a waste inlet neck on a heated, machined nickel mold is sealed by the liner when the powder box is joined to the mold. The powder box spout is at room temperature and shields the inlet neck to prevent gel build-up on the inlet neck to effect considerable cost by both a reduction in waste deposits of gel and a reduction in labor required to trim a waste area on the mold. To obtain the coating, the mold is coated with powdered vinyl (hereinafter gellable material) by casting from the powder box to the mold and the excess material is removed from the mold by dumping it from the mold into the powder box.

Abstract: A mold having a concrete base and a mold cavity member lined with sheet metal. Adjacent the sheet metal are electric heating means and between the electric heating means and the concrete base is a light-weight concrete insulating layer.

Abstract: The exposed surface of a molten metal, ferrous or non-ferrous in a ladle is covered by an expanding insulating ladle covering compound that is capable of absorbing and removing non-metallic inclusions in a predictable volume. The compound includes burnt lime in amounts between 56% and 60% by weight, aluminum dross, including Al.sub.2 O.sub.3 in amounts between 22% and 30% by weight, fluorspar in amounts between 7% and 9% by weight, and acid treated graphite in amounts between 1% and 4% by weight.

Abstract: The mold features on its work face a thermally insulating protective layer of sub-micron metal oxide particles.The coating can be applied by spraying an aqueous sol of a metal oxide onto the mold work face which has been heated to at least 60.degree. C.The use of sub-micron sized metal oxide particles enables the formation of a protective coating of very low density and consequently very low thermal conductivity. The coating can furthermore be deposited very economically, and likewise removed again.

Abstract: A method of making a curved-tip (coude) catheter which comprises: inserting an end of a flexible, thermoplastic tube into the bore of a closed-end, hollow, tubular die which defines the desired curve of the curved-tip catheter. The tubular die is heated to a temperature above the plastic melt temperature of the thermoplastic tube, while advancing the tube into the die, to cause at least about 0.5 cm. of the tube end to collapse into a generally solid, curved mass. The die and tube contained therein are then cooled to a temperature below the plastic melt temperature, and the tube is withdrawn having a closed, formed coude tip.

Abstract: A tire press bag well is insulated with at least one envelope. The envelope extends substantially around the bag well within the bag well housing and can be inflated. The envelope, in addition to its insulating properties, can have insulation thereon and the ends of the envelope can be fastened to itself. The configuration of the envelope, once installed, desirably conforms to the shape of the bag well housing. Since heat is applied to a tire press via the bag well, insulation thereof considerably reduces heat loss as well as reduces cure time.

Abstract: The invention provides shaped, refractory, heat-insulating articles, for use in a metallurgical vessel, comprising particulate refractory material, binder and particulate de-fibred bagasse or the like. The articles may be made by mixing the ingredients, pressing them in a former and causing or allowing the binder to set. The articles may be slabs for lining the head of a mould for steel ingots.

Abstract: An insulated metal mold having a molding surface defining the cavity of a mold for molding thermoplastic resin. To regulate the cooling speed of the molten resin to be injected or placed into the cavity, the molding surface is provided by a thin metal layer and a layer of heat insulating material is formed on the inner side of the metal layer.

Abstract: A mold especially adapted for forming precast, waffle-shaped concrete panels employs a one-piece mold body of plastic sheet material to provide a reusable mold structure that may be rapidly stripped and reset. Each corner of the mold body is open; thus, the sides of the mold present pliable flaps due to the inherent flexibility of the sheet material and are swung outwardly after molding is completed in order to release the molded product. External reinforcing members on the sides maintain the same rigid and true during the molding process. The corners are held closed by simple locking devices which are readily released for stripping. Raised portions in the mold body form the characteristic voids in the molded waffle product, and are reinforced and rigidified by a foam filler.

Abstract: Silica- or alumina-containing granules are loaded into a mold of which the inner walls at least are formed of a nonbonding material constituted of ferrochromite, magnesiochromite, calciochromite, or trivalent-chromium oxide. The mass is then heated to a temperature above the softening point of the granules so as to fuse them together and thereafter the heated mass is hardened. As the mass can inherently not bond to the lining of the mold subsequent separation is relatively easy.

Abstract: Removable form for use in pouring concrete walls, the form being comprised of a high strength, impact resistant, light weight material and being constructed to provide thermal insulation of concrete poured between two of the forms. The forms are each comprised of a face plate backed by an insulative support structure. The insulative support structure has a honeycomb construction filled with an insulative material, the honeycomb construction providing strength to the insulative support structure to prevent bending or distortion. A supporting frame is further provided as a structural supporting backing for the insulative support section to increase its resistance to bending.

Abstract: Plastic molding assembly having resistance to elevated temperatures in molding comprising a cooling chamber for flowing a cooling medium within the plastic mold body, a large number of metal radiating wires of good heat conduction and of easy plastic deformation being thoroughly buried within the plastic portion of such body, said metal radiating wires being positioned in such manner as to be in part in contact with the cooling medium within said cooling chamber.

Abstract: The mold is preheated to a temperature above the maximum local casting temperature prior to casting of the melt and is also cooled to obtain a variation of temperatures throughout the mold. The resulting temperature gradient of the mold is intended to maintain the heat content per unit volume in the unsolidified melt portions greater than in the adjacent solidified melt portions to compensate for the latent heat of solidification in the melt and thus avoid shrinkholes and blowholes.

Abstract: A big-end-down ingot mold has a heat insulating chamber which, when the ratio of the width of the wider walls to that of the narrower walls of the mold is less than 1.7:1, is formed in each of the four side walls and, when the ratio is 1.7:1 or more, is formed in each of the two opposed wider walls and whose horizontal sectional areas each gradually increase from below toward above. By means of the heat insulating chambers the solidification rate of the molten metal is regulated to prevent the formation of secondary pipes and segregation around the pipes within an ingot cast in the mold.

Abstract: The invention involves providing a molten metal sampler or device with means for dissipating heat therefrom when the sample is obtained.