Abstract: A replaceable mold cavity for use in the production of golf balls is disclosed herein. The mold cavity has a plastic insert with an inverse dimple pattern thereon that is formed from a plastic molding material, and a support cup in which the plastic insert is placed for the golf ball molding operation. The plastic insert may have a metal layer thereon that has an identical inverse dimple pattern. The entire replaceable mold cavity may also be composed of a plastic material. The use of plastic molding materials to form the plastic insert, or the entire mold cavity, allows for rapid production of golf balls having different dimple patterns which allows for expedited testing and introduction of new golf balls.

Abstract: A paint film laminate is co-molded over a desired plastic substrate to produce an automobile bumper member, chin spoiler or rocker panel part. Along a desired surface of the part, such as, for example, a border between a part surface having one segment covered by paint film and a second segment comprising the exposed substrate, the edge of the paint film is embedded in the plastic substrate along a surface discontinuity such as a recess or ridge so that an aesthetically pleasing sight edge having a desired contour exists along this surface portion. The sight edge is formed during the co-molding process via the provision of an incline or ramp along a desired mold cavity surface. When the co-molded part is installed in its intended application, the paint film edge is substantially hidden from view by the surface discontinuity.

Abstract: A graphic image is applied to a candle by depositing paper having a preprinted image atop a pool of molten wax for a few moments so that air is driven from the paper. The air-free paper is then positioned inside a candle mold and molten wax is poured into the mold. When the wax has cooled and the candle is removed from the mold, the paper is air bubble-free and is therefor transparent and not visible. The image is as clear as if it had been printed onto the candle. In a second embodiment, the image-bearing paper, after having been deposited atop a pool of molten wax for a few moments, is rolled into a cylindrical shape and placed concentrically into a candle mold having an interior diameter greater than the external diameter of the cylinder. Molten wax is then poured into the mold and the candle is removed when the wax has cooled.

Abstract: To provide a polypropylene-based resin exterior panel which has the same appearance qualities as a coated product though it is not coated and which is excellent in rigidity and impact resistance, a polypropylene-based resin exterior panel comprising a surface layer made from a highly transparent resin composition comprising a propylene-.alpha.-olefin random copolymer having a melting point lower than 155.degree. C. and a melt flow rate (MFR) of 0.5 to 30 g/10 min and a clarifying nucleating agent, an intermediate layer made from a colored resin composition comprising a propylene-.alpha.-olefin random copolymer having a melting point lower than 155.degree. C. and an MFR of 0.5 to 30 g/10 min and a coloring pigment, and a base layer made from a base composition comprising a propylene-.alpha.-olefin block copolymer having a melting point of 155.degree. C.

Abstract: A method and apparatus for manufacturing a film-covered flange having the following steps. An injection molding press having a mold cavity and a core receives a pre-molded thermoformed film. The film is formed to have an in-turned flange portion that will form the covering for the final article. The film is placed within the mold cavity. The core has a slide movable between retracted and extended positions. The slide is retracted and the core is moved within the mold cavity. After the press is closed the slide is moved from the retracted position to the extended position. The slide includes a recessed portion that lies opposite the flange portion to create a space therebetween. A molten plastic material is injected into the space. The plastic material adheres to the flange portion and forms an article having a covered flange.

Abstract: A method for mass producing midsoles for articles of footwear includes the following steps: forming first midsole portions of an article of footwear in predetermined sizes with a hollow area for receiving an insert and an aperture in at least one side of the first midsole portion for viewing the insert; forming inserts in predetermined sizes and shapes for placement in the hollow area of the first midsole portions; matching the predetermined size of the inserts to one or more predetermined sizes of first midsole portions; forming the size and shape of the hollow area and aperture for a given size first midsole portion to accommodate the predetermined size and shape of the insert; placing inserts into the hollow area of size matched first midsole portions; adjusting the position of the at least one aperture gasket along the side of the mold to align with the aperture in the first midsole portion; inserting the aperture gasket into the aperture of the first midsole portion to completely seal the aperture; pouri

Abstract: There are provided structure members by which ordinary workers other than technical workers can easily joint beams and beams, beams and pillars respectively made of concrete and also can construct buildings which can be extended. There are also provided methods of jointing the structure members. The structure member comprises a hollow tube made of concrete or a material similar thereto. Two or more structure members arch having irregular portions on an inner surface thereof are butt-joined with each other, then a filler is introduced into the hollow portion of each structure member to be solidified so as to joint the structure members. Reinforcing members etc. are put into the hollow portions of the structure members, or steel frames and bag bodies, etc. are fixed by a jointing frame and a filler is introduced therein. It is also possible to joint two or more structure members by way of a jointing member.

Abstract: An improved process for the manufacture of plastic articles such as light assemblies, and the articles made by said process, are disclosed. The disclosed process includes a step wherein one or more colors are decorated onto a single film which is then incorporated with other components in an in-mold decorating process to yield the improved articles of the invention.

Abstract: To make spherical shape of the terminal end of extruding part of a push-button switch to press a curved contact portion composed of a metal belleville spring and a resin film dome. In addition, the gate injecting mouth 4 for thermoplastic material 3 is opened in the side surface of the extruding part 2 or in the side projection made in a mold to inject the resin material in order to make molding of spherical shape of the terminal end of extruding part 2 of a push-button switch possible. By this structure, the present invention can provide a sheet-like key top having improved clicking touch and preventing break of a contact portion by residual stress.

Abstract: A method for manufacturing a seal at a cylinder head of a vehicle motor includes providing a bearing groove at a cylinder head of a vehicle motor and providing a mold member for cooperating with the bearing groove to form the seal. The seal material is introduced into the mold member so as to provide a defined excess surpassing the volume of the sealing material required for filling the bearing groove. Curing of the seal material enclosed in the bearing groove and the mold member is achieved under pressure. The pressing device for performing the method includes a mold member with receiving groove for cooperation with the bearing groove of the cylinder groove.

Abstract: A process for manufacturing a multilayered object by molding having the steps of placing a lining sheet in a mould, injecting a thermoplastic resin material beneath the lining sheet, distributing the thermoplastic resin material beneath the lining sheet to form at least one thermoplastic resin based inner layer by creating a reserve of the thermoplastic resin material in a peripheral portion of the object, holding the extending portion of the sheet in place on the mold during the step of injecting and after the step of injecting so as to retain peripheral tightness of the thermoplastic resin material on a sliding holding point on the punch during movement of the die, pressing the extending portion of the lining sheet against the mold, and sandwiching the reserve in a liquid state between the lining sheet and a portion of the mold until the injected resin material sets to thereby form the multilayered object.

Abstract: Disclosed is a method for providing various supports in cushions suitable for chairs sofas, and pillows. The method comprises piercing a previously manufactured cushion (86) with injecting needles (84) to inject a firming solution into the cushion (86) to provide the internal lumbar support (88). The needles (84) can be placed at a variety of different heights to product various effects. Also disclosed are a number of products that can be produced using the method, with explanations as to how the method can be adapted to produce each variation.

Abstract: A method of molding a movable block for a rolling motion guide device can effectively prevent the formation of burrs in the rolling member rolling groove and accurately positioning the movable block body in a molding die.The positioning of the movable block body in width, vertical and longitudinal directions is performed at plain surfaces that are different from the rolling member rolling groove, so that damage or injury of the rolling member rolling groove can be prevented. Further, the molding material is shut off at either both end portions or both side peripheries of the rolling member rolling grooves, so that the molding material can be prevented from invading into the rolling member rolling grooves.

Abstract: A decoration sheet is retained on the cavity periphery by a sheet clamp in such a state that it is projected into a molding cavity of a female die. Then the decoration sheet is heated and softened by a curved hot platen, and thereafter it is drawn through suction ports of the female die to bring the sheet into close fit to the inner periphery of the molding cavity. The deformation amount of the decoration sheet heated and softened is decreased in premolding the sheet into the molding cavity surface of the female die. Therefore, distortion of the decoration sheet, appearance of wrinkles, and breakage thereof become little. Next, the female die and the male die are coupled with each other to effect die clamping, and a molten resin is poured to fill the molding cavity to effect injection molding.

Abstract: A separator cartridge comprises a support screen comprising a substantially rigid reinforced plastic cylinder including an inner first major surface and an outer second major surface, a first nonwoven polymer layer adhered to the inner first major surface of the support screen, a second nonwoven polymer layer adhered to the outer second major surface of the support screen, and a polymeric screen contacting and frictionally engaging the second nonwoven polymer layer, the polymeric screen including a hydrophobic coating. The invention also contemplates a process for preparing the separator cartridge.

Abstract: Method of lining a pipe. An outer pipe of ferrous metal is lined with a lining pipe of crosslinked polyethylene which is initially provided as a precursor lining pipe. The precursor lining pipe is initially made of cross-linked polyethylene with an external diameter equal to the internal diameter of the outer pipe. The initial pipe is then drawn through a die to form a pipe with a smaller diameter. The material of the pipe is memory material so that when it is melted it automatically expands to the original size. The precursor pipe is inserted into the outer pipe and melted by drawing a burner through it. The burner burns fuel gas supplied with combustion air through a hose by which the burner is towed. Hot products of combustion melt the polyethylene causing the precursor lining to expand automatically into the lining pipe. This is supported by gas pressure of a desired value inside the lining pipe until the polyethylene solidifies on cooling.

Abstract: A foil-decorating injection molding method including using a foil-decorating injection molding machine with an injection mold having a male mold and a female mold. The female mold has a cavity surface for forming a cavity, and a parting surface having an outer peripheral section on which to hold a decorative sheet, and an inner peripheral section extending between the inner edge of the outer peripheral section of the parting surface and the edge of the cavity surface in a concavely curved shape to allow the expansion of a peripheral portion of the decorative sheet around a decorating portion of the same during preforming. This reduces local strains in the decorative portion of the sheet and ensures a uniform thickness distribution of the sheet to prevent breaking and creasing of the sheet.

Abstract: A sheet-decorating injection molding method using a sheet clamper for fixedly holding a decorative sheet on a parting surface of a movable mold of an injection mold. At least the inner edges of the surfaces facing the movable mold of the sheet clamper are finished in smooth, convexly curved surfaces, respectively, and a groove for receiving the sheet clamper therein is formed in a fixed mold at a position corresponding to the sheet clamper in a depth sufficient to permit the movement of the sheet clamper between a position to hold the decorative sheet fixedly on the parting surface of the movable mold and a position to be separated from the decorative sheet in state where the injection mold is clamped.

Abstract: A golf ball core and a method of making the same wherein remarkable reduction of eccentricity of an inner layer to an outer layer is accomplished, and mass-production of the golfball cores are possible. The golfball inner layer is penetrated into at least a part of a seam portion of the outer layer. A volume of an intrusive portion of the inner layer into the outer layer is arranged to be 1/300 to 1/5 of a volume of the outer layer, suppose the outer layer is a complete spherical shell. To form a core, an unvulcanized material is semi-vulcanized or vulcanized to form an outer layer half shell whose configuration is generally a hemispherical shell, and an unvulcanized inner layer forming material is put between the pair of outer layer half shells and vulcanizing pressed.

Abstract: An article including a panel-like structure constructed to be mounted in an automobile vehicle to form a part of the interior thereof, and a process for making the same. According to this process, an outer layer defining at least a portion of the exposed exterior surface of the structure is prepared by applying a water-dispersed thermoplastic polyurethane composition and a heat-activated reactive crosslinking monomer onto a mold surface and thereafter drying the composition. Next, a rapidly reacting composition is sprayed onto an inner surface of the outer layer while the outer layer is retained on the mold surface to form a polyurethane elastomer inner layer that is interfacially chemical bonded to the outer layer. The inner layer with the outer layer interfacially chemically bonded thereto is then united with the rigid substrate so that the rigid substrate serves to reinforce the outer layer.

Abstract: A cushion article, such as a wrist support or the like, and a method of manufacturing same are provided. The cushion article includes a multiple density, cushioned surface bonded to a molded foam shell. The saddle includes a contoured fabric surface with an underlying layer of soft gel. The gel may be molded to form embossment or imprinting in the fabric surface. A method of the invention includes the steps of disposing the saddle shell having a fabric sealed thereto, into a mold having a molding surface defining a desired contour and/or a desired pattern of embossment to be formed in the fabric. A thermoplastic gelable liquid is injected between the shell and the fabric. The fabric is contoured and or embossed by allowing the gelable liquid to cool while the shell is disposed in mold. The shell may be made of a foam material which is compressed into a desired shape and heat treated to form a shell having firmer, more dense portions and softer, less dense portions.

Abstract: A method for filling a hole in a printed wiring board (PWB) and the resultant PWB. During an intermediate stage in fabrication, a PWB comprises a lamination of dielectric sheets with metalizations on various layers and a plated through hole (PTH). A photoimageable material is formed on a surface of the laminate and covers the PTH. The photoimageable material in a region covering the PTH is partially cured by exposure to light. The remainder of the photoimageable material is developed away. Then, the partially cured photoimageable material in the region of the PTH is pressed into the PTH to form a plug. By application of heat during or after the forcing step, the plug is further cured to a hard condition. For some applications, the plug is mechanically abraded to be flush with one or both surfaces of the laminate.

Abstract: An air bag cover and manufacturing method thereof wherein the air bag cover comprises a core member which can be formed by injection molding, and a decorative sheet disposed on the surface of the core member. The decorative sheet includes at least two layers, an outer layer and a barrier layer disposed on a back side of the outer layer to protect the outer layer when the core member is injection molded. The core member is made of thermoplastic elastomer which can be thermally fused to the barrier layer. A breakable portion is provided in the barrier layer and core member.

Abstract: A method for manufacturing a film-coated article by the following steps. A pre-molded film having a backing surface and a decorative surface is formed in the shape of the molded article. The film includes an opening that allows the molted plastic to pass through the film. The film is placed within a mold press having a mold with a cavity surface and a movable core. The mold includes an resin inlet with an inlet surface. The film is placed on the mold with the decorative surface juxtaposed the mold. The opening on the film overlies the resin inlet. The mold is closed and the film held securely in place against the inlet surface. A molten plastic material is injected through the resin inlet. The plastic material passes through the film and fuses to the backing surface. After the article has cooled, the press is opened. The molded article is retained on the core and removed from the press.

Abstract: Automobile body parts having contoured, decorative outer surfaces are molded. The automobile body parts include a molded polymer substrate and a decorative surfacing film adhered to one side of the substrate. The decorative surfacing film includes a substantially molecularly unoriented cast polymer film formed from a weatherable polymer. Also a method for making sets of such automobile body parts for assembly into automobile bodies is taught.

Abstract: A small amount of a non-yellowing surface-forming polyurethane material containing a polyether polyol, a hexamethylene diisocyanate trimer, a coloring agent and an organic bismuth catalyst is initially injected into a mold cavity under reduced pressure to form e.g. the surface portion of a polyurethane covering for a steering wheel. An inner-forming polyurethane material is subsequently injected into the cavity under reduced pressure to form an inner portion of the covering.

Abstract: A method of manufacturing a controlled-release device is described. The method comprises taking a hollow tubular element which is permeable to the active substance to be released and injecting it with at least two plugs of hardenable material. These plugs form partitions which block the hollow tubular element and are spaced apart to form at least one discrete hollow chamber. The hardenable material is then hardened and an active substance is introduced into at least one of the discrete hollow chambers.

Abstract: Convoluted tubing for automotive wiring harnesses and other elongated substrates is provided with sound dampening qualities by filling the valleys between convolutions with a flexible, resilient foamed composition, such as silicone rubber, and foaming the composition to cause expansion of the foam so that ribs of foam project radially from the valleys. In a preferred embodiment, spaced apertures are formed in the valleys to allow the expanding foam to form radially inwardly projecting fingers which contact the wiring harness and act to dampen vibrations. The corrugated tubing may be axially slit and the slit allowed to be filled with the foamed composition which, when foamed, eliminates noises caused by movement of the edge surfaces of the slit when torsional forces are applied to opposite ends of the tube.

Abstract: A method of making a sock liner for insertion in footwear comprising providing a sock liner member having a cavity in an underside thereof, filling the cavity with a fluid which is curable to an elastomeric condition, and allowing the fluid to cure to the elastomeric condition.

Abstract: A foil-decorating injection molding method and a foil-decorating injection molding apparatus adjust the tautness of a decorative sheet fed onto a parting surface of a female mold so that tensions T.sub.1, T.sub.2 and T.sub.3 of the decorative sheet during a sheet feed operation of the sheet feed means, at the start of the sheet clamping operation of the clamper for pressing and fixing the decorative sheet and at a moment immediately before the completion of the sheet clamping operation, respectively, meet an inequality: T.sub.1 .gtoreq.T.sub.2 >T.sub.3 to prevent the decorative sheet from breaking or slipping off the clamper when clamping the decorative sheet on the parting surface of the female mold.

Abstract: Methods for making candles are disclosed, as are candles made using that method. A wick holder and wick are positioned at the bottom of a container. A sleeve/shroud is then positioned in the cavity to protect them during molding. Molten wax is poured into the cavity outside the sleeve. The wick is centered using the sleeve after the wax has been added. While the wax is only partially hardened the sleeve is then removed. Remaining molten wax then surrounds the wick.

Abstract: In the method, after the pattern-bearing film is fed to the female mold, the distal end of the film is fixed under a lower portion of the female mold, and at the same time the film is retreated by a force from the film supply portion. Thus, this tightens up the film so that the slacks or wrinkles cannot be formed on the film. Therefore, the film can be fortunately spread around the parting surface of the female mold. In the apparatus, the film suppressing frame is pressed to the female mold through the sliding rod arranged in the female mold, in such a manner that the female mold embraces the frame. Thus, the pressing of the frame is performed by a simple structure, and the film is accurately positioned to the internal surface of the female mold. Also, the film suppressing frame is constituted to advance from and retreat to the female mold. Thus, this causes a space between the both molds and an outside standby position to be useless. A space around the apparatus can be effectively utilized.

Abstract: A non-disassembling partition assembly for insertion into a container for dividing the space inside the container into separated cells. The assembly comprises a plurality of first slotted partitions intersecting with a plurality of second slotted partitions to form a matrix. The matrix is held together in a non-disassembling collapsible relationship by a plurality of weldments at a plurality of intersections. Each weldment is formed by injection of molten plastic between opposed face plies of intersecting partitions at an intersection at a sufficiently high temperature, to at least partially melt the spacers betweeen the face plies of the intersecting partitions to create a weldment therebetween. The weldments are formed of a plastic which is preferably the same type of plastic as that from which the partitions are made in order to aid in the recyclability of the partition assembly.

Abstract: A molded unit is made using a rotational molding process. In making the molded unit, a tool assembly houses the mold material. A fixture assembly is also contained within the tool assembly. The fixture assembly holds an insert member in place. The insert member becomes an integral part of the molded unit during the rotomolding process. Preferably, the insert member is spaced from the inner walls of the tool assembly in order to permit mold material to flow and solidify in this space. The fixture assembly is removable from the interior of the molded unit through one or more access openings that are formed in the molded unit.

Abstract: A tubular hollow molded body is formed with a resin having a bending resistance; the hollow molded body is inserted into a mold; a resin with less stress relaxation is injected into both ends of the hollow molded body through a connecting path to mold a bellows intermediate; the resin moved into the connecting path of the bellows intermediate is removed; and a cut is put in the hollow molded body to mold a bellows portion.

Abstract: The present method includes an apparatus for filling and sealing an opening in a laminate and in particular sealing the cut-out notch area of a vehicle windshield. A mold fixture includes a mold, a backing plate, a sealant inlet and a vent. The mold has resilient sealant contacting surfaces that provide a smooth surface for forming the surface of the sealant filling the opening. The mold fixture is clamped to the laminate such that selected portions of the mold overlay the opening and remaining portions of the mold overlay selected portions of the laminate immediately adjacent the opening. Sealant is injected into a cavity formed by the laminate and the mold fixture to seal the opening. The sealant is allowed to cure to achieve a desired hardness and the mold fixture is then removed from the laminate.

Abstract: The present disclosure sets forth both a method and apparatus for molding a unitary pig formed of two types of material, one being a light weight foam, and the other being a harder polymeric material thereby yielding a unitary harder material in the cast pig. The finished product involves N discs having parallel end faces and a central drilled core; the unitary cast harder material defines end located discs located adjacent to said foam core and a central core therein so that the end located discs adjacent to the foam donut are unitary with the core and bonded thereto.

Abstract: A method and a semi-finished article for producing plastic material objects, in particular smart cards, are disclosed. At least two surfaces of the object are constituted by films, preferably by labels. The labels are applied to surfaces of a cavity in a mold of a plastic material injection molding machine. The cavity is then filled by injecting molten plastic material. The labels are connected one to the other prior to being introduced into the cavity.

Abstract: A unitary or one-piece acoustical cabinet grille frame and a method for making the one-piece grille frame. In the unitary acoustical cabinet grille frame a sound-transmissible fabric is integrally bonded or fused to serrations in a slot within the shaped plastic face. In the method for manufacturing the one-piece acoustical cabinet grille frame, a sound-transmissible fabric is placed over a shaped plastic face. A heated fusion blade having the configuration of the slot is placed over the sound-transmissible fabric. The fabric is forced into contact with the plastic serrations in the slot and the plastic serrations are plasticated or melted. The sound-transmissible fabric is then fused with the plastic. Finally, the heated fusion blade is removed from the slot and the plastic is allowed to cool.

Abstract: An article including a panel-like structure constructed to be mounted in an automobile vehicle to form a part of the interior thereof, and a process for making the same. According to this process, an outer layer defining at least a portion of the exposed exterior surface of the structure is prepared by applying a water-dispersed thermoplastic polyurethane composition and a heat-activated reactive crosslinking monomer onto a mold surface and thereafter drying the composition. Next, a rapidly reacting composition is sprayed onto an inner surface of the outer layer while the outer layer is retained on the mold surface to form a polyurethane elastomer inner layer that is interfacially chemical bonded to the outer layer. The inner layer with the outer layer interfacially chemically bonded thereto is then united with the rigid substrate so that the rigid substrate serves to reinforce the outer layer.

Abstract: A shaft assembly comprising an elongated member having at least a portion which is hollow, tubular, shell like having an inside surface defining a shaft core and an outside surface defining a shaft functional surface, the shaft core being filled with a hardened, moldable material, and the shaft functional surface having at least one functional feature thereon, which is of hardened, moldable material integrally molded with the hardened, moldable material in the shaft core. In a preferred embodiment the shaft assembly is rotatable and has at least one molding aperture gate extending through the shaft from the inside surface to the outside surface which is filled with hardened, moldable material which connects the hardened material in the shaft core and functional feature.

Abstract: Rigidifiable composites are formed by stitching a reinforced B-stage resin sheet stock to form a three-dimensional preform. The preform is subsequently rigidified by initiating final cure of the resin. Molded articles, inflatable and other structures, such as, tank, tunnel and sewer liners are some of the typical structures which can be formed by the methods of the invention. Control of thread count, thread tension and thread spacing can be used to consolidate multi-ply or layered preforms, which, upon cure, can have up to 90% of the load carrying capacity of compression molded fiber reinforced articles.

Abstract: The present invention pertains to a polymeric sealing/spring strip and method of producing same. The polymeric sealing/spring strip of the present invention has several various embodiments which are based upon the incorporation of silicone rubber. Some of the embodiments are based on the formation of a resilient silicone rubber surface to provide a sealing/spring contact with an opposing surface period. Other embodiments of the invention incorporate the silicone rubber in such way as to utilize its resilient properties to produce a sealing/spring strip which has improved mechanical resilience properties. The method of the present invention allows the production of a sealing/spring strip in accordance with the present invention by using extrusion techniques.

Abstract: The method is disclosed for producing a tamper respondent enclosure (10). A flexible tamper respondent laminate (32) is folded to define an inner enclosure (26) which is then potted within an outer enclosure in the form of a molding (28).

Abstract: The invention relates to an obturating stopper plug as well as to a method of manufacture of this stopper plug.The stopper plug for obturating any opening (2) and comprising a bead of heat-fusible adhesive (7) deposited upon the said stopper plug is characterized in that the bead of heat-fusible adhesive (7) comprises:(a) an adhesive mixture,(b) a cross-linking agent,(c) an expansion agent decomposing at a temperature close to the cross-linking temperature of the adhesive mixture (a),(d) additives for working purposes.The invention is applicable to the obturation, for example, of an opening in a plate to be passed into a drying oven for paint.

Abstract: A method of manufacturing a waterproof connector housing and an apparatus for use in such method wherein an overflow preventing wall which is projected to joining direction of both a male metal mold and a female metal mold is formed around at an edge portion of space for forming a packing, after the overflow preventing wall and the housing are allowed to adhere in such a way that the overflow preventing wall presses the housing arranged between both the metal molds, the rubber material is injected into the space. It can be surely prevented the overflow of the rubber material from the space.

Abstract: A radome structure has an outer first layer of a fiber-reinforced composite material of quartz fibers in a noncrystalline cured oligomeric cyanate ester pre-polymer. A second layer of a syntactic foam underlies and is bonded to the first layer. A third layer of the same fiber-reinforced composite material (although possibly of different thickness) underlies and is bonded to the second layer. A fourth layer of the syntactic foam underlies and is bonded to the third layer. A fifth layer of the same fiber-reinforced composite material (preferably of the same thickness as the first layer) underlies and is bonded to the fourth layer. The structure is formed by layup of the first layer inside a female mold, and successively shaping the remaining layers and tacking them to each preceding layer. The shell produced in this manner can be joined to conforming shells.

Abstract: A method of manufacturing a waterproof connector housing, that enables the formation of a uniform packing ring which is an integral part of the housing by engaging a hollow body of a housing with a trapezoidal engaging portion provided on a male mold, holding the housing by contacting tightly an inner wall of the hollow body with the trapezoidal engaging portion to align the center of the male mold with that of the housing, and injecting a rubber material into a packing ring forming space uniformly defined by one of both of the male and female mold through a rubber supply paths of the housing. The housing having the hollow body with tapered shoulder, a male mold having the trapezoidal engaging portion and a female mold beveled or thinned at the open edge are employed for implementing the method.

Abstract: Internal thermal protection for a thruster structure, e.g. an end wall and extender structure of a tactical thruster, is made by preparing a low viscosity elastomer base suitable for being mixed with fibers by means of a mechanical mixer without putting the base into solution, by mixing the elastomer base and the fibers so as to obtain a solid composition in finely divided form suitable for being stored, and by molding the composition in situ in order to obtain the thermal protection directly on the structure to be protected. The viscosity of the elastomer base is less than 1500 Pa.s at 50.degree. C., and it vulcanizes at a temperature greater than 120.degree. C.

Abstract: A method of making a toothed belt. A toothed belt is made by guiding a strip of fabric to pass through a thermosetting resin to soak it with thermosetting resin, then the soaked fabric is guided to pass through a pair of toothed rollers to form a series of toothed grooves thereon, thereafter the fabric is guided to pass around a plane roller and simultaneously rubber material is fed into the space between the outer peripheral surface of the plane roller and said fabric. Then, the fabric is wound onto a cylindrical mold having corresponding toothed grooves thereon and its two ends are glued together to loop around the cylindrical mold, then reinforcing cords and rubber sheets are covered over the fabric. Finally, the rubber material is vulcanized to form a toothed belt. Fabrics treated by the method demonstrate considerately greater flexibility or extendibility to comply with bending when under operation. Furthermore, the tooth contour of the belt will be more accurate than conventional ones.