Abstract: In a method of making a molding, a fiberboard substrate and a decorative paste composition are provided, and then the decorative paste composition is set to a surface of the fiberboard substrate. The paste composition is applied to a surface of the fiberboard substrate when the paste composition is at ambient temperature and, then a mechanical roller such as a design or laminating roller is used to press the paste composition against the surface of the fiberboard substrate. Using such a design roller, an ornamentation is produced on the outer surface of the paste composition. The ingredients for the paste composition include a quantity of polyvinyl acetate and a quantity of fillers, such as wood fillers and shell fillers. These and other ingredients are then, mixed together under ambient conditions to produce a decorative paste composition that exhibits stretchability, pliability and adhesive properties. The paste composition also exhibits a wood grain appearance.

Abstract: A molded plastic component having enhanced surface finish is molded within a mold having at least one metal base, a mold cavity, and at least one self-lubricating surface layer which defines the plastic component within the mold cavity. The self-lubricating surface layer includes a porous metallic skin integrally connected to and extending from an interior surface of the at least one metal base and lubricating particles disposed on the skin and in pores of the skin. The lubricating particles are bonded together to form a sealed surface of the at least one self-lubricating surface layer such that the molded plastic component has the enhanced surface finish. The metallic skin includes a plurality of spaced, sinusoidally-shaped projections of autocatalytic nickel alloy. The lubricating particles are preferably submicron-sized particles of low friction fluoropolymers. The mold may be an injection mold, a compression mold, a blow mold or a vacuum mold.

Abstract: Plastic moldings reinforced with long fibers are made without the risk of forming loops in a continuous thread or roving fed to a cutting unit at the end of a mold filling operation or tearing thereof during renewed start-up for the next molding filling operation, even at a relatively high take-off speed of the continuous thread. This is achieved by keeping the continuous thread permanently under tension pneumatically against the conveying direction. The device useful for carrying out this process is equipped with at least one tensioning air inlet in the guide for the continuous thread or roving.

Abstract: The present invention discloses a generic method for producing void and gas occlusion free materials, as well as apparatuses for batch and continuous production of same. This generic method can be utilized in the production of a wide variety of polymeric compounds and composites and specifically encompasses the two ends of the polymeric composite spectrum, that is, polymer concretes on the one hand, and fiber-reinforced polymer composites on the other. The composite materials of the present invention are characterized by visual count as being void and gas occlusion free to the level of 1 micron at 1250× magnification. Concomitantly, the invention produces useful polymer concrete materials which exhibit substantially improved integrity for easy machining at high speeds, and high dielectric and mechanical strength, as compared with composite materials produced by conventional methods.

Abstract: The present invention discloses a generic method for producing void and gas occlusion free materials, as well as apparatuses for batch and continuous production of same. This generic method can be utilized in the production of a wide variety of polymeric compounds and composites and specifically encompasses the two ends of the polymeric composite spectrum, that is, polymer concretes on the one hand, and fiber-reinforced polymer composites on the other. The composite materials of the present invention are characterized by visual count as being void and gas occlusion free to the level of 1 micron at 1250× magnification. Concomitantly, the invention produces useful polymer concrete materials which exhibit substantially improved integrity for easy machining at high speeds, and high dielectric and mechanical strength, as compared with composite materials produced by conventional methods.

Abstract: A method of producing a three dimensional section of polymerized liquid. The method includes providing a molding apparatus which includes a mold having at least one side, at least one piece of porous material adjacent to the one side of the mold and at least one support layer adjacent to the piece of porous material. The molding apparatus is clamped together and a liquid is added between the frame and the porous material. The filled molding apparatus is placed in a bath of polymerizing agent until the liquid polymerizes to form a three dimensional section.

Abstract: A process for preparing a polymer composition useful as a prepreg comprises (a) melt-mixing at least one thermoplastic polymer above the glass transition temperature or melt temperature of the thermoplastic polymer with either (i) an uncured epoxy resin or (ii) an epoxy curing agent or a catalyst; (b) melt-mixing above the glass transition temperature or melt temperature of the thermoplastic polymer, the other of (i) an uncured epoxy resin or (ii) an epoxy curing agent or a catalyst to form a substantially uncured but essentially curable and/or polymerizable composition; (c) optionally forming a shaped product from the melt-mixed composition of (b); and (d) fast-curing and/or fast-polymerizing the optionally formed shaped product.

Abstract: A sintered laminated structure including a plurality of ceramic layers made of ceramic materials different from one another, wherein each of the ceramic layers is provided with through-holes passing each of the ceramic layers.

Abstract: A method is described for manufacturing coated tablets made of tablet cores and coating granulate using a press that has at least one compression chamber with preferably an upper and a lower punch and a feeding device for tablet cores. The method according to the invention is characterized by the fact that before the coating granulate is compressed, at least one pasty tablet core is added to the coating granulate to be compressed and in that the coating granulate and tablet core(s) are compressed in a single compression step.

Abstract: The method of the present invention is performed by providing a glass sheet having first and second opposite surfaces merging with each other along a peripheral ground angled surface setting-off with the glass sheet first surface an included angle substantially greater than normal. The glass sheet is placed in a mold having opposing cavity portions which collectively define a cavity including a peripheral edge cavity portion defined in part by a cavity defining surface which lies in the plane of the glass sheet first surface when the mold is closed. The mold is then closed such that the cavity defining surface and the glass sheet round angled surface set-off and angled complementary to the included angle and with the glass sheet per surface abutting the cavity defining surface inboard of the glass sheet ground angled surface.

Abstract: A disclosed process for producing a molded article made of fiber-reinforced thermoplastic material includes providing a molding machine containing a plasticizing apparatus having an opening for receiving raw materials, an apparatus for feeding the raw materials to the plasticizing apparatus and a molding apparatus having a cavity; feeding both thermoplastic material in a solid state and reinforcing fibers with a length from about 3 mm to about 50 mm simultaneously into the plasticizing apparatus through the opening from the feeding apparatus; melting the thermoplastic material and kneading the thermoplastic material and the reinforcing fibers in the plasticizing apparatus to produce kneaded material comprising the thermoplastic material and the reinforcing fibers; supplying the kneaded material to the molding apparatus from the plasticizing apparatus; and molding the kneaded material into the molded article in the cavity is provided.

Abstract: The present invention discloses a generic method for producing void and gas occlusion free materials, as well as apparatuses for batch and continuous production of same. This generic method can be utilized in the production of a wide variety of polymeric compounds and composites and specifically encompasses the two ends of the polymeric composite spectrum, that is, polymer concretes on the one hand, and fiber-reinforced polymer composites on the other. The composite materials of the present invention are characterized by visual count as being void and gas occlusion free to the level of 1 micron at 1250.times. magnification. Concomitantly, the invention produces useful polymer concrete materials which exhibit substantially improved integrity for easy machining at high speeds, and high dielectric and mechanical strength, as compared with composite materials produced by conventional methods.

Abstract: A wood cement board substantially consisting of reinforcing wood material and a cement wherein said reinforcing wood material is treated by a method comprising attaching an aqueous solution of a mineral acid and adding and mixing an alkaline metal silicate in said reinforcing wood material to prevent the inhibition of hardening of cement by sugar contained said reinforcing wood material is provided in the present invention. According to the present invention, a wood cement board having a high strength is constantly manufactured by using reinforcing wood material made from wood having a big amount of sugar as an inhibiter of hardening of cement such that reinforcing wood material regenerated from wood scrap can be used in wood cement board without any problem.

Abstract: A process for producing composite materials which can be thermally postformed, with a matrix of polylactam produced by means of activated anionic polymerization is offered.

Abstract: The disclosed gelatinous cushion comprises a gelatinous material enclosed in a membrane fixed to a support. The membrane has at least one told and the gelatinous material assumes the shape of the fold. The fold is arranged in such a way that the membrane unfolds when pressure is exerted on the cushion. Advantages: the elimination of the membrane effect due to the compression of the gelatinous material in the membrane, the improvement of wearing comfort and of dampening properties. Application in particular to the making of highly comfortably nose-pads for eyeglass frames.

Abstract: The invention relates to a process for production of a composite product which involves molding several materials of different natures, including an oriented-reinforcement material that is preimpregnated with resin, without the resin being injected separately after the other materials in the mold are assembled,in which the resin is a modified polyester-polyurethane that is formed by reacting:a first component that comprises (A) at least one polyisocyanatewith a second component that comprises:(a) at least one polyol polyester,(b) at least one ethylenically unsaturated monomer.

Abstract: A composite finishing cover for a component such as a vehicle instrument panel is provided by extruding a parison of inner and outer layers of different recyclable plastics having different characteristics but which are from the same family of plastics. The parison is injected with low pressure gas when forming dies are being closed thereover so that the plastics will fully conform to the forming surfaces of the die tooling cavity. The closing force of the dies cause the heat softened inner layers of the first plastics material to join at their interface to form a relatively thick core or substrate providing structural support for the relatively thin and flexible outer layer of the cover, also joined at their interface. The outer layer provides a finishing surface that exhibits a soft feel as when the human hand lightly contacts and moves across the surface thereof.

Abstract: Tubular parison of a molten resin to such an extent as to melt undergoes a pre-blow with a blow molding apparatus, whereupon the blown tubular parison is clamped between dies of a blow molding apparatus, and also, is mutually weld together with parts of the inside faces of the tubular parison to form a multiple of isolated hollows in the parison. Gas is fed through a multiple of gas feed nozzles which are provided in the die into the hollow portions. A number of the hollow portions are opened in a second process to form a functional part.

Abstract: A method and apparatus for providing bus protocol simulation in a multi-processor data processing system (10). A plurality of edge interface circuits (14,16) are used to interface a first bus (32, 34, 36), which uses a first bus protocol, with a plurality of data processors (50-65), each of which uses a second bus protocol. A memory (90) within each edge interface circuit (14,16) is loaded with a plurality of values. Each of the plurality of values has a control portion and a data portion. The control portion of memory entry "N" is used to initiate the transfer of the data from memory entry "N+1". In an alternate embodiment, multi-processor data processing system (210) includes a plurality of data processors (250-258) and a plurality of edge interface circuits (214-217).

Abstract: Provided is a method of making a multi-property polyurethane part by RIM having a surface layer and an interior layer. The surface layer and the interior layer have different properties. The pressure in the cavity of the mold is reduced and a surface forming RIM polyurethane material is injected into the evacuated cavity, whereby the surface layer of the molded part is formed by RIM. An interior forming RIM polyurethane material is injected into the evacuated cavity, whereby the interior of the molded part is also formed by RIM.

Abstract: The car interior member and its molding method are offered to improve recycling and to reduce the number of parts. The instrument panel 10 as the car interior member is made by molding integrally the core member 11 organizing the main structure of certain area of car interior and the functional member 12, 13, 14 having particular function and attached to the core member 11 by the blow molding. On the occasion of then, the number of parts can be more reduced when the base layer arranging the most inside and the foamed layer and the surface layer arranging outside of the base layer are effected by the multilayer blow molding in case of the instrument panel 10 formed with the multi-layer construction.

Abstract: A process creates molded pans by reaction injection molding (RIM) of inorganics. Two or more slips are mixed as they are being fed into a mold and the slips react rapidly with each other to form a mechanically strong part. The slips contain ceramics/metals which chemically react to form a binding phase, or which destabilize, floe, or gel to form the part. The formed part is then removed from the mold and used as is, or heat-treated prior to use. With this forming process, setting times are independent of part size, unlike slip casting or injection molding, and there is no requirement to add or remove heat from the mold to form the part.

Abstract: An RIM method of thermoplastic resin comprises a process for preparing materials in which one compound (i) is mixed with a material for thermoplastic resin to prepare one mixture (I), and the other compound (ii) is mixed with a material for thermoplastic resin to prepare the other mixture (II), each of two compounds (i) and (ii) being inactive to the material for thermoplastic resin but producing a high-active anionic polymerization catalyst by their reaction, a process for polymerization in which the mixture (I) and the mixture (II) are mixed, injected into a mold, and polymerized by the anionic polymerization catalyst, an ejecting process in which a solidified thermoplastic resin molded body is ejected from the mold. Therefore, a polymerization reaction cannot be started before the material for thermoplastic resin is injected into the mold, and it begins soon after the material for thermoplastic resin is injected into the mold.

Abstract: A device for moulding articles of composite material includes a pressurizable gasket and an injection head the end of which is flush with the impression of the mould. After low-pressure filling the mould impression with jets of resin and catalyst so oriented as to secure the mutual mixing thereof, the pressurizable gasket allows the half-moulds to be further approached to each other and obtaining thereby the impregnation of the reinforcer element previously charged into the mould impression.

Abstract: A preparing of a self-supporting or free-standing three-dimensional unitary structural body by a method including generating successively a plurality of cross-sectional layers of the body, one layer top of the other and with the layers joined together to form the body and with the generating of a cross-sectional layer comprising placing a plurality of drops of a liquid composition, containing a first reactant, in a pattern of discrete drops making up the cross-sectional layer and subsequently placing a plurality of discrete drops of other liquid composition, containing another reactant, in contact with the placed drops ion the pattern so that the first reactant and the other reactant react to provide a solid.

Abstract: The invention relates to a resin composition containing low-molecular compounds which form a polyester urethane hybrid network. The resin composition contains a first component consisting of a condensation product of at least one diol and at least one unsaturated dicarboxylic acid material, a second component containing an ethylenically unsaturated monomer capable of copolymerizing with the first component, and a third component consisting of a polyisocyanate. The first component substantially consists of a diester compound of 2 diol molecules and 1 molecule of a dicarboxylic acid material, which dicarboxylic acid material consists of at least 75% of .alpha.-, .beta.-unsaturated dicarboxylic acid.

Abstract: The invention is directed to a process for preparing a Class-A surface, fiber reinforced molded article. The process broadly requires the use of a polished mold and two separate fiber surfacing veils with a fiber reinforcement sandwiched therebetween. A polyurethane reaction system is injected into the mold.

Abstract: This invention relates to poly(ethylene 2,6-naphthalene dicarboxylate) blends having reduced fluorescence. More specifically, the process involves melt blending poly(ethylene 2,6-naphthalene dicarboxylate) with 0.1 to 5 weight percent of a fluorescence quenching compound selected from a halogen containing aromatic compound, an aromatic ketone or a naphthol compound and thermoforming the blend into an article. The blends are useful for packaging applications where clarity and/or aesthetic appeal are of concern.

Abstract: This invention relates to naphthalenedicarboxylic acid containing polymer compositions having reduced fluorescence. More specifically, the process involves melt blending a naphthalenedicarboxylic acid containing polymer with 0.1 to 5 weight percent of a fluorescence quenching compound selected from a halogen containing aromatic compound, an aromatic ketone or a naphthol compound and thermoforming the blend into an article. The blends are useful for packaging applications where clarity and/or aesthetic appeal are of concern.

Abstract: Apparatus for and method of supplying viscous blends, casting resins for example, of two or more components that react and cure when blended, preferably in a vacuum. There is one holding tank for each component. There is a set of flow controls downstream of each holding tank. There is check valve downstream of each set of flow controls. There is a line downstream of each set of flow controls or of each check valve. Blenders communicate with each line. An injector downstream of each blender supplies the blend to a compression-setting mold. The line leading out of each holding tank and through the flow controls and check valve extends past each blender and back into the tank, accordingly constituting a closed loop that begins and ends at the tanks. The loops extend through FORWARD/DIVERT valves with one intake and two alternatively opening and closing outlets. One outlet forwards the component on through its loop. The other outlet diverting it out of the loop to one of the blenders.

Abstract: An expansion system for a bus-architecture system is disclosed, particularly for an SBus-compatible system. The expansion system includes a host expansion board which fits into one of the expansion slots connected to the SBus, a cable connected to the host expansion board, and an expansion chassis connected to the cable. A memory management unit is included in the host expansion board, for mapping physical addresses on said SBus into addresses of add-on functions installed in the expansion chassis. This mapping allows for varying memory size functions to be installed into a single expansion slot. The MMU also copies the ID PROMs from each of the add-on functions into RAM on the host expansion board, so that such expansion is transparent to the driver software.

Abstract: A method for vacuum molding of large objects in a dismountable mold. The method includes the steps of introducing a monomer and a hardening agent to a cavity within a mold, with the cavity being under a vacuum. The monomer and hardening agent are introduced at least at one position in the cavity. The position being situated initially in the lower portion of the cavity. The position is successively moved upward at such a speed that the position is located just below the surface of the monomer and hardening agent as they are introduced into the cavity and their level rises within the cavity.

Abstract: A crosslinked molding, a process for producing the same, a sound medium using the same, and an ultrasonic coupler using the same are disclosed. The crosslinked molding comprises a crosslinked molding comprising a composition containing a rubbery elastic body comprising a hydrophobic high molecular weight material having at least one double bond in the molecule and an oily component dissolving the rubbery elastic body, the composition being crosslinked by the addition of an organic peroxide or by the irradiation of a radiation and molded.

Abstract: A method for making a protector to prevent galvanic anodes from being accidentally knocked off a pipeline in which a mold having a frusto-conical shape is placed around each end of a segmented anode, with an opening at the top of the mold opposite a gap between anode segments, liquid components of a rapid setting elastomeric polymer are injected into the opening until all of the cavities and the gap are filled, and the polymer is allowed to set up and adhere to the anode and to the pipe.

Abstract: A method and apparatus for supplying two different components at two different flow rates to an extrusion head. A first component is delivered to an extrusion head through a first hose at a predetermined pressure. A second component is delivered to the extrusion head through a second hose at substantially the same predetermined pressure as the first component. The second hose extends partially through the first hose so that both components are delivered to the extrusion head at constant equal pressures.

Abstract: A trim member for use as an interior furnishing in a motor vehicle includes a covering sheet including one surface having an embossed pattern, a first foamed body disposed on the other surface of the covering sheet, with a first component embedded partly in the first foamed body, and a second foamed body disposed on the other surface and/or the first foamed body, with a second component partly embedded in the second foamed body. The covering sheet, the first foamed body, and the second foamed body are integrally formed as a unitary construction. Since the trim member is constructed as an integral unitary assembly, it does not squeak while the motor vehicle is running, and does not have visible steps and joints on its outer surface.

Abstract: A process for RIM bonding urethane gaskets to glass panels which includes storing a primed glass panel in a temperature-humidity controlled environment for 20-28 hours. The primed and conditioned panels are then fitted with RIM gaskets with 24 hours after removal from the controlled environment.

Abstract: A process for producing large-size formed articles consisting of a modified polyamide, by polymerization of a mixture containing, besides the omega-lactam corresponding to the polyamide, the following reagents:a) a polymerization catalyst selected from the sodium salt and the potassium salt of said omega-lactam;b) a polyoxyalkylene polyamine having a molecular weight ranging from 400 to 5,000 and an amine functionality ranging from 1.9 to 2.5;c) an activator consisting of a polyisocyanate having all the isocyanic groups blocked with a lactam;said reagents being fed, at a temperature of from 105.degree. to 125.degree. C., to a mold heated to 130.degree.-170.degree. C.

Abstract: A compacted and highly oriented microstructure of the bulk-shaped Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the intermediate pressing method of the present invention. The growth rate of the high critical temperature phase in the bulk of Pb-doped Bi-Sr-Ca-Cu-O system oxide superconductor is also much improved and the sintering duration for obtaining a single phase having a high critical temperature is shorteneed by this method. Additionally, a higher critcal current density of Bi-Sr-Ca-Cu-O system oxide superconductor is obtained by the working under pressure process after cooling between a first and a second sintering step. Furthermore, the magnetic field dependence of the critical current density of Bi-Sr-Ca-Cu-O system oxide superconductor is also improved by the method of the present invention.

Abstract: Dry cementitious compositions and packages and methods for their application. The dry compositions do not have to be mixed with water but instead are poured, sprayed or troweled onto a substrate which contains water in an amount in excess of that necessary for the hydration of the cementitious materials. These compositions can be applied by layering, dropping through a conduit, or preferably, merely dropped into the water.

Abstract: A method and apparatus are presented for the casting of gradient gels, without voids, in confined support structures such as thin slab-type configurations. Furthermore, by using a differential activation scheme for the casting, the method makes is possible to produce such gels in slabs of capillary cross-sectional dimension. According to a preferred method, a gradient slab gel is cast by filling a countable number of grooves in a first plate with a first gelling liquid. A gel casting region for a slab gel is formed by spacing the first plate apart from a second plate so as to provide a flow path between the first and second plates which has a directional component orthogonal to the grooves. A second gelling liquid is injected into the gel casting region between the plates, such that the first liquid mixes with the second liquid as the second liquid encounters each groove, thereby forming a gelling mixture with a composition gradient.

Abstract: A wide variety of products are formed by compression molding of silicone materials. Although such articles are used in numerous applications, compression molding is expensive and exudation of unreacted monomers and oligomers tend to cause electrical contact failures. By employing specific polyurethanes formed from polyols and isocyanates, it is possible to form articles by reaction injection molding. This process is substantially cheaper than compression molding and yet the same properties obtainable with silicones are attained.

Abstract: An extrusion die is described for extruding a polymer from a reactive precursor mixture without plugging of the die. The extrusion die includes a die inlet leading to at least one channel having dimensions which produce a wall shear stress value that exceeds the critical wall shear stress value for the particular reactive precursor mixture to prevent occlusion of the die. The preferred configuration of the die channels is a tree-like structure to obtain a coating width which is greater than the dimensions of the individual channels. Other features of the invention include a method for determining the critical wall shear stress value and a method for extruding reactive precursor mixtures.

Abstract: A method for manufacturing an interior member for vehicles comprises the steps of laying a surface layer in a cavity of a mold, placing a reinforcing fiber mat onto the surface layer, compressing the surface layer and the reinforcing fiber mat in the mold, injecting raw material for obtaining a polyisocyanurate and demolding an integrally-molded interior member from the mold after the completion of a reaction of the raw material. The raw material comprises a trimerization catalyst, a polyol and a polyisocyanate. The amount of raw material is determined so that the density of the obtained polyisocyanurate is 1.2 to 1.9 times as much as the density of the same polyisocyanurate in its free foaming state.

Abstract: An apparatus for manufacturing silicone gel sheet comprising a material supplying means which supplies kneaded silicone gel material to a nozzle, a nozzle which admits to flow silicone gel material supplied from said material supplying means and is provided with a discharging port which is open to be narrow and long, at least one movable receiving means which receives a sheet-formed strip made of silicone gel material discharged from said nozzle and moves in accordance with the discharging speed of the sheet-formed strip, and a heating section for heating and gelling the sheet-formed strip made of silicone gel material on said movable receiving means.

Abstract: Moldings possessing a front or rear layer of different properties and capable of backlighting, and a method for the manufacture thereof by proceeding so that after printing, by means of the screen printing method, in such a manner that the thickness of the ink layer, applied as a simple layer on a 0.1 mm-2.0 mm thick synthetic resin sheet, will be 4.mu. or more (preferably 5.mu. or more), or that the thickness of the ink film layer, applied in two or more layers, will be 8.mu. or more (preferably 10.mu. or more), or, alternatively, that the thickness of the ink film applied as a simple layer will be 4.mu. or more (preferably 5.mu. or more) and the thickness of the ink layer applied in two or more layers will be 8.mu. or more (preferably 10.mu.

Abstract: Methods of forming a filled, cured two-component organic thermosetting composition by placing resin and hardener components on a substrate or in a container or mold and dropping particles of a filler material therethrough so that the resin and hardener components contact each other, react and cure, thus forming the cured composition.

Abstract: A process for producing molds, models and tools from hard gypsum and/or cement including applying at least one base layer composed of a binder to a model from which a mold is to be made and which has been provided with an unmolding agent, and pressing onto this base layer a glass fiber reinforced molding composition composed of 95 to 0 weight % .alpha.-calcium sulfate hemihydrate, 0 to 95 weight % cement, 0.5 to 8 weight % glass fibers and 0.5 to 4 weight % suspension agent, with reference to the dry weight, as well as water in a wet-on-wet process and unmolding the resulting laminate after it has set.

Abstract: The present invention provides a molded product composed of a polymer alloy of a polyamide polymer and at least one polyurethane polymer, polyurea polymer, and/or polyisocyanurate polymer. The polymer alloy is an interpenetrated network of different polymers, a semi-interpenetrating network of different polymers, or a polyblend of different polymers.Reactant streams containing the compounds for forming the polymers of the polymer alloy are admixed to form a reaction mixture. The liquid reaction mixture is preferably a substantially homogeneous mixture of the reactant compounds. Each reactant stream thus contains only a portion of the components required to obtain the polymer alloy product. The resulting mixture is then rapidly introduced into a mold wherein chemical reaction takes place and the polymer alloy forms. Preferably, the mold is heated. The solid polymer alloy product is then recovered from the mold.

Abstract: In a molding machine wherein in molding a molded article, the molded article is molded into a so-called sandwich shape in which the central portion of the molded article is molded with core layer resin and the outer surface of the core layer is wrapped with skin layer resin, a valve for changing over and injecting the resins from a first injection cylinder for injecting the core layer resin and a second injection cylinder for injecting the skin layer resin is substantially cylindrical, a cut-away portion for changing over and distributing the resins is formed in the central portion of the valve, and sandwich molding is accomplished with the opening-closing of the cut-away portion and each passageway being effected by rotation of the valve.