Abstract: Disclosed is a method for the injection molding of a resin to produce a shaped resin article having a thick portion biasedly, wherein an excess filling of the cavity of a mold is effected to form a molten resin mass having opposite, first and second surfaces respectively facing opposite, first and second inner walls of the mold cavity, the mold having a specific structure in which a gas-release passage is formed in association with the mold cavity and with a mating surface of the mold, which gas-release passage has an inner opening in an inner wall surface of the mold cavity and communicates with the outside of the mold, and a pressurized gas is introduced into the mold cavity on a side of the first surface of the molten resin mass, thereby forming a closed space which is filled with the pressurized gas and separated from the gas-release passage through the molten resin mass, so that the pressurized gas filled in the closed space urges the second surface of the molten resin mass to be pressed against the seco

Abstract: A mold for foam molding a material for a synthetic resin molded foam, includes a mold main body having: a lower mold half; an upper mold half removably disposed on the lower mold half in such a manner as to cover an opening portion of the lower mold half for forming an enclosed space therebetween; and a middle mold part removably disposed in the enclosed space. In the mold main body, a plurality of spacers, spaced from each other in the circumferential direction, are provided between the middle mold part and the upper mold half; chambers, partitioned from each other by the spacers, are formed between the upper surface of the middle mold part and the lower surface of the lower mold half; and a cavity communicated to the chambers through gaps between the spacers and through a micro-gap formed between the middle mold part and the lower mold half, is formed between the middle mold part and the lower mold half, wherein a synthetic resin foam molding material is supplied into the cavity.

Abstract: A vent for a mold having a mold cavity comprising a vent main body, a valve closure member having an upper end face for positioning at the surface of the mold cavity, the valve closure member being moveable with respect to the vent main body for opening and closing the vent, a spring opening mechanism formed integrally with the vent main body for opening the vent, and a valve seat between the valve closure member and the main body wherein the vent is closed by material in the mold cavity contacting the upper end face of the valve closure member.

Abstract: The subject invention pertains to unique methods for producing articles with a polyurethane integral skin at low cost. The methods of the subject invention permit the production of highly detailed painted articles having an outer polyurethane layer and an inner polyurethane foam structure, wherein the outer layer is waterproof. The subject invention further pertains to the articles produced by the methods of the subject invention.

Abstract: The present invention concerns a molding device with a longitudinal axis, comprising a first half-shell and a second half-shell, the two half-shells being capable of being joined along an opening plane so as to form a cavity with an elongate cross-section, having a major axis and a minor axis. The opening plane of the mold is substantially perpendicular to the major axis. In accordance with the invention, each half-shell comprises at least two separate longitudinal parts joined along at least one joint surface, each joint surface being delimited by two opposed sides of two adjacent parts, at least one of the sides having at least one recess so as to define with the other side at least one narrow slot to allow air to escape along the surface during the blow molding of the object.

Abstract: In order to prevent the formation of flash on a gasket used to seal a filter element when the filter element is mounted in a housing to filter a fluid, such as air for an internal combustion engine, a molding method and apparatus utilizes a pair of mold components which abut along a mold line and define a cavity for forming the gasket. As the expandable material expands to fill the cavity and form the gasket, a portion of the material adjacent the mold line is received in an annular groove in one of the mold components so that flash is not formed at the mold line. One of the mold components also has an upwardly sloping ramp surface so that air and gas move along the ramp surface as the material expands and does not become trapped in the cavity, thus avoiding defects and blemishes in the gasket due to trapped air bubbles.

Abstract: A system for placing a vacuum on a container for a cement or molding mixture includes a container for holding the cement which has an opening for adding or removing cement. A flexible polymer film cover is sized to cover at least the open portion of the container and has a vacuum hose coupling attached thereto which connects to a vacuum hose connected to a vacuum pump for drawing a vacuum between the cover and the container. Attaching means, such as a clamping bracket, are provided for removably attaching the flexible polymer cover to the container. A vapor trap is attached in the vacuum line for capturing vapor removed by the vacuum applied to the container. A mold may have a hollow mold core member placed in the center of the mold which has a plurality of apertures therein and which has the uncured cement placed therearound for producing the vacuum in the center of the molded part during the curing of the concrete.

Abstract: A vent for a mold comprising a valve closure member and integrally formed spring opening mechanism for opening the valve closure member such that when mounted in an air release vent the valve closure member may open or close said vent.

Abstract: A chill vent is provided with a cooling pipe around a zigzag-shaped gas exhaust passage, and made of a Be--Cu alloy which is superior in cooling power. An accelerated solidification of non-solidified molten metal entering into the chill vent is achieved, thereby effectively preventing flashing of the molten metal without complicating the construction or increasing the size of the entire facility.

Abstract: A foam-filled door manufactured in accordance with the present invention comprises a frame (11) having a pair of ledge areas (58) extending about substantially the entire inner periphery of the frame (11). The frame (11) is formed by the spaced parallel positioning of a pair of rails (12) and a pair of stiles (14). The ledge areas (58) formed in the frame (11) are of substantial width and depth to provide an area of bonding between the facers (20, 21) and the frame (11). The ledge areas (58) also form vents (100) that allow air to escape from a cavity (22) formed between the frame (11) and pair of facers (20, 21) when a foaming material is injected into the cavity (22) to prevent internal air pockets from forming. The facers (20, 21) have flanges (90, 92) that surround substantially the entire outer periphery of the facers (20, 21) and engage the outer periphery of the frame (11).

Abstract: A chill vent made of copper or copper alloy has a concave section and a convex section, each being subjected to removal of flat parting portions on both side surfaces, and a gas exhaust passage is formed over the entire width region. These gas exhaust passage portions have side surfaces and back surfaces which are enclosed in hard U-shaped guide frames. It is possible to effectively avoid occurrence of leakage or flashing of molten metal due to a plastic deformation of the chill vent by a mold fastening force applied upon assembly of a die-casting mold, which may occur when a copper or copper alloy having a superior cooling property as the material for chill vent.

Abstract: A process for the injection molding of objects having an outer layer of enamel and an inter layer of a plastic material is disclosed. According to the process, a liquid enamel is used. This enamel is injected by an enamel-injection apparatus through an enamel-injection die. A plastic melt passes through an injection unit into the cavity. According to the invention, the liquid enamel is injected into the flow path of the melt in the region before the cavity, before the melt is injected, so that the melt is encased by enamel before it is distributed in the cavity. Variations are also disclosed. For example, the form can be filled with enamel and the excess enamel drained. Then, the melted plastic material is introduced into the injection molding form. Also, the form can filled and then the capacity of the form increased to accommodate the melted plastic material. In any case, it is possible to use liquid enamels to enamel injection molded parts in the tool or form.

Abstract: A resin-made vehicular lighting unit having protruding portions is formed in a mold apparatus. The mold apparatus includes first and second molds which are used to form a cavity for resin-molding the vehicular lighting unit. Recessed portions are formed in the first mold and are used to form the protruding portions on a front surface side of the vehicular lighting unit. The second mold includes projecting members, each of which correspond to the recessed portions of the first mold.

Abstract: An injection molding apparatus for producing a molded form having a thin thickness portion through injection molding, comprising: a metal mold; a cavity formed in the metal mold for molding the molded form; a degassing hole formed in a portion of the metal mold corresponding to the thin thickness portion of the molded form; a degassing pin inserted in the degassing hole and fixed thereat, the degassing pin being longitudinally divided into at least two divisional parts; whereby gas in the cavity is forcedly exhausted not only through a first air gap between an inner surface of the degassing hole and an outside surface of the degassing pin but also through a second air gap in an abutment portion between the divisional parts of the degassing pin.

Abstract: Apparatus, method and sealing means for liquid urethane reaction mixture injection molding of a composite styled metal and plastic vehicle wheel wherein a metal wheel subassembly serves as a preform between the separable mold parts in the mold apparatus and which is united with the plastic body molding material to form the composite wheel. One of the mold parts has a mold cavity surface operable in mold closed condition to define with the outboard face of the wheel subassembly a mold cavity adapted to provide an ornamental configuration for an outboard face of the plastic body of the composite wheel. A gas permeable and liquid infiltratable mold sealing membrane has a first portion thereof communicating with ambient atmosphere externally of the mold cavity and a second portion thereof communicating with the mold cavity.

Abstract: A mold for tire vulcanization comprises a plurality of segments forming respectively a part of a circular interior complementary to land portions and groove portions of the tread portion of a tire product and being separable from each other in the tire circumferential direction, and each of the segments comprising a plurality of pieces forming said circular interior part and a block supporting the pieces, wherein each of the pieces comprises a combination of a matrix metal and a core made of a different kind of material which is preferably fitted to a through hole of the matrix metal and has a lower coefficient of thermal expansion than that of the matrix metal. In a method of manufacturing the mold, upon casting the matrix metal, the matrix metal is cast around the core with a higher fusion point than that of the matrix metal.

Abstract: A mold for molding a synthetic resin coated with a highly durable thick heat insulating layer, and a molding method using the same are provided. The present invention relates to a mold comprising a base mold comprising a metal, with its inner wall constituting the mold cavity being coated with a heat insulating layer, wherein the heat insulating layer comprises a polymer alloy comprising (A) a heat-resistant non-crystalline resin of a linear high-molecular weight polymer containing an aromatic ring in the main chain thereof and having a glass transition temperature of not lower than 150.degree. C. and an elongation at break of not less than 10% and (B) a cured thermosetting resin at a (A)/(B) mixing ratio of 40/60 to 5/95 by weight; and further relates to a molding method using the mold.

Abstract: A moulding system for moulding a mass with a pasty or dough-like composition, such as a mass of meat, for example for moulding hamburgers, includes a housing having a chamber which is delimited by internal walls of the housing. The chamber emerges on the outside of the housing. A displaceable mould plate, which is formed in a manner corresponding to the chamber, fits with a small degree of play into the chamber and has at least one mould cavity. The housing has a feed opening, which opens into the chamber, for the mass to be moulded, such that, in the position in which the mould plate has been slid into the housing, the mould cavity is in communication with the feed opening and, in the position in which the mould plate has been slid out of the housing, the mould cavity is situated outside the housing.

Abstract: In an apparatus for molding resin to seal electronic parts, an internal die space defined at least by pots, cull portions, resin passages and cavities when an upper mold section and a lower mold section are closed, is cut off or sealed from the exterior atmosphere. Thereupon the die space is evacuated using a first evacuation by a vacuum source and a second or instantaneous evacuation by an instantaneous evacuation mechanism. The vacuum source for the first evacuation may be an active vacuum pump, while the instantaneous evacuation mechanism may be a vacuum tank that has been previously pumped down, for example. Using this apparatus, it is possible to quickly improve the degree of vacuum in the internal die space by efficiently and reliably discharging air, moisture and gas from the internal die space to the exterior due to a synergistic action of the evacuation and the instantaneous evacuation. Consequently, the formation of voids in resin molded members is prevented.

Abstract: A multi-layer optical recording medium manufacturing method and apparatus thereof forms a resin layer having a second recording layer on a first recording layer. The first recording layer includes a reflecting layer and a first recording layer sequentially formed on a transparent substrate. The multi-layer optical recording medium manufacturing apparatus includes an upper and a lower mold on which is respectively fixed the transparent substrate and a stamp such that they are facing each other. Communicating holes formed in the transparent substrate and the stamp are formed in center portions of each of the molds. A punch member capable of vertical movement is established in the communicating hole of the lower mold, and resin supply established in the communicating hole of the upper mold. The above apparatus has the advantage of improving productivity of the manufacture of a multi-layer optical recording medium.

Abstract: An apparatus for thermoset molding includes a first mold portion having a first rim and a second mold portion, having a second rim which substantially conforms to the first rim. The first and second mold portions form a mold cavity therebetween. An actuator mechanism is coupled to the first and second mold portions and is adapted to selectively press the first and second mold portions together. An inner seal positioned between the first and second rims and generally conforming to the first and second rims is provided to substantially seal the first and second rims when pressed together. A bridging member spans the inner seal and selectively weakens the inner seal thereby allowing air passage therepast. An injection valve is provided having a plunger which is moveable to allow resin injection or resin blow-through. Further, a mount is provided for removably attaching a clamp to a mold portion.

Abstract: A device for the encapsulation of syringes and other hazardous plastic waste having needles or other sharp elements, the device having a melt chamber with a reciprocating compaction head, the weight of the compaction head providing the force to conform molten plastic into a puck covering the needle points. Flow release apertures allow for escape of gases and provide an overflow conduit for excess molten plastic. The puck adheres to the compaction head and is ejected back into the melt chamber for removal and disposal.

Abstract: A composite structure and method of making the composite structure are disclosed. A reinforcing fabric such as fiberglass is mechanically attached, for example, by stitching to a non-woven polyester fabric. The attached fabrics are placed in a mold with the non-woven fabric facing the inside of the mold. A self-expanding, self-curing foam is filled into the mold in an amount sufficient so that upon expansion in the closed mold, the foam penetrates into the interstices of the non-woven fabric which upon curing forms a bond therewith. The resulting structure can be used in a number of applications wherein the reinforcing fabric is later impregnated, for example, with a resin, and allowed to cure. Typical use of such a structure is as a stringer in fiberglass boat construction.

Abstract: A pneumatic tire, a tire making method and a tire vulcanizing mold are disclosed. The tire has a pair of rounded or tapered shoulder portions each of which is provided with a circumferentially extending narrow groove for improving the wandering performance. The mold is provided with a tread molding face and shoulder molding faces. Each of the shoulder molding faces is provided with a protrusion for forming the above-mentioned narrow groove. The protrusion is provided with slits for forming thin partition walls in the narrow groove. The tread molding face is provided with vent holes. And vent grooves each of which extends from one of the slits in the shoulder molding face into the tread molding face is provided. As a result, no spue is formed in the tire shoulder portions and the tire appearance is improved. And the productivity can be improved.

Abstract: The tire mold includes a shell for the molding of the sidewalls, said shell including a laminated assembly formed of lamelliform elements directed substantially parallel to the axis, the molding surface for said sidewall being formed by the adjacent edges of the said lamelliform elements.

Abstract: There is provided a preplasticizing injection machine including a resin vent formed in the injection cylinder behind the plunger stroke wherein said resin vent is connected to a pressure reducing device and/or an inert gas feeding machine. The resin entrapped in the clearance prevents gases generated within the cylinder from being exhausted and it may be blackened due to the oxidation thereof. According to the present invention, these problems can be solved by the above construction. Furthermore, a band heater is provided on the outer surface of the cylinder behind the injection plunger stroke over the resin vent to prevent the entrapped resin from being solidified.

Abstract: The terminal treatment device for a plastic optical fiber is improved so that void formation between the melt zone of the ferrule and the plastic optical fiber is avoided, leading to the prevention of crack formation. The device constitutes a chamber, the upper side of which is open, a heater in the chamber, a heated element which may be at the top of the chamber, and a base frame and a top frame to secure the heated element to the chamber. The element is a rectangular plate, made of a metal having good thermal conductivity and includes a thicker part and a thinner part surrounding it. At the center of the thicker part, there is provided a blind hole into which the tip of the ferrule is fitted. A plurality of heat evacuation vents is formed around this blind hole and elsewhere in the chamber to facilitate cooling.

Abstract: The invention relates to a method of making an intraocular implant having a flexible lens. The method includes in using a mold having two parts (12) and (16) which are disposed on either side of a plate (20), e.g. made of PMMA, which plate includes a central orifice. The material (32) that is to constitute the lens portion is disposed in the central cavity of the mold. This material may be an acrylic, for example. After unmolding, the plate (20) is machined to make the haptic, and optionally the part (32) is machined to make the lens.

Abstract: A roller-shaped stamper has a scale portion with a light transmitting forming portion for forming the light transmitting portion on the resin, and a light shield forming portion for forming the light shielding portion of the resin, wherein the forming portions are alternately arranged with a constant pitch in a direction of rotation of said roller-shaped stamper; a plurality of scale portions are arranged in a direction normal to the direction of rotation of the roller-shaped stamper; and a groove disposed between the plural scale portions and extending in the direction of rotation of the roller-shaped stamper for exhausting air otherwise trapped between the resin and the roller-shaped stamper.

Abstract: A fixture for fixing an annular upper air isolation member which is provided around an outer side of an upper mold section to an upper mounting plate is released, thereby rotating the air isolation member by a rotational member and fixing the same by a rotational position regulating member. An upper chase unit is exchanged through an upper opening which is defined by the upper mounting plate and the rotated air isolation member. A lower chase unit is also exchanged in a similar manner. Due to this structure, a sealing mechanism for a resin sealing/molding apparatus for electronic parts which can readily and quickly exchange a mold in response to small lot production of various types of products is provided.

Abstract: A method of and apparatus for molding hollow items using the resin transfer molding technique in such a manner that the resin is more uniformly distributed about and along the molding region of the mold. This is accomplished by installing oppositely spaced grooves in the mold and injecting resin directly into these grooves. Upon such injection, the resin travels along and fills the groove (by taking the path of least resistance) before such resin is squeezed or forced out a minute gap that exists between the molding surfaces and into the molding region of the mold. As such resin is being forcibly injected into the cloths in the mold, a vent permits any air displaced from the cloths by the resin to be released. Such resin injection and mold venting occurs until such time that no more air is vented and instead 100% resin is being discharged from the mold. Upon this occurrence, further resin injection is curtailed and the resin previously injected is allowed to harden and cure.

Abstract: A mold apparatus for producing a synthetic resin foam part has a mold assembly (1) including a lower mold (2), an upper mold (3) removably attached to the lower mold to define a closed space, and an insert (4) removably disposed in the closed space. The insert has a partition (6) which is faced to the upper mold through a gap (11). The partition defines a chamber (7) between the insert and the upper mold. The closed space excluding the chamber constitutes a cavity (8) into which a molding compound is introduced. A pressure regulator means (21) is provided for exhausting air from the chamber (7) to keep the chamber in a subatmospheric pressure whereby air in the cavity (8) is also exhausted through the gap.

Abstract: A vehicle interior trim component, such as a glove compartment or console door, and its method of fabrication includes an outer flexible shell having a peripheral contoured return flap captured within a peripheral gap provided between insert and backing panels of the component. Foam is injected into a space between the outer shell and insert panel and any gases and excess foam are allowed to escape from the foam space into an adjacent overflow chamber in a controlled manner through the gap while the return flap seals the assembly against external leakage of such excess foam.

Abstract: A composite insulator-producing lateral type molding apparatus includes a mold body constituted by a first molding unit and a second molding unit, each of said first and second molding units being provided, at an inner peripheral face, with recesses for the formation of a housing constituted by a plurality of shed portions and a axial portion connecting these shed portions, means for opening or tightening the first molding unit and the second molding unit, a pouring passage for pouring a housing-forming material into said recesses, and housing-forming material escape holes. A core member of the insulator is placed between the first and second molding units, the first and second molds are tightened, and the housing-forming material is poured into said recesses to form the housing. The first molding unit and the second molding unit extend laterally, and that the core member is laterally arranged horizontally between first and second molding units.

Abstract: A high impact resistant rotationally molded door and process for molding the door is disclosed in which a hinge member is integrally molded to the door along one edge only. This hinge member forms to the hollow door edge without door warpage during curing and shrinking of rotationally molded plastic door body. Door warpage is avoided by delaying full integral attachment of the hinge member to the door until curing of the injected foam interior which both bonds to the interior of the door and the hinge member. An improved seal and hinge seal is disclosed together with a placed window construction that can include both placement and shaping to meet the special order needs. Further improvements including the expedient of venting a rotationally molded door during the rotational molding process through an integrally molded hinge edge reinforcing member. This same venting scheme is utilized for enabling improved cooling of the door once molding of the hollow door shell has occurred.

Abstract: On mating surfaces of a pair of mold members are formed a breathing groove communicating with a cavity, a detection chamber for detecting a melt pressure at an end of the breathing groove, a detour groove diverging from the detection chamber and a valve chamber communicating with a vent passage at an end of the detour groove. A valve element of a shut-off valve member is positioned in the valve chamber and retracts to a valve closing position when the shut-off valve member moves in a direction perpendicular to and separating from the mating surface. A detection pin having an end fronting toward the detection chamber and a operation pin having an end fronting toward the valve chamber and abutting against the valve element are connected through a reverse mechanism so that the pins move in opposite directions to each other.

Abstract: A molding method is used to mold a semiconductor device within a molded carrier ring. A mold tool (30) has an upper platen (32) and a lower platen (34). Each platen has a package cavity (36) and a carrier ring cavity (38). Between the package and ring cavities is a venting hole (60) having a venting pin (63) slidably fit therein. The venting pin includes a flat surface (64) that allows air which is forced from the package cavity during molding to escape through a narrow gap. The gap size is made small enough to prevent the passage of resin to flow through. Thus, the invention permits the mold tool to be compression cleaned and prevents mold tool down-time previously experienced when molding resin gets dogged in traditional venting holes. In another embodiment, the venting pin can be placed within the package cavity and also serve as an ejector pin.

Abstract: In order to prevent the formation of flash on a gasket used to seal a filter element when the filter element is mounted in a housing to filter a fluid, such as air for an internal combustion engine, a molding method and apparatus utilizes a pair of mold components which abut along a mold line and define a cavity for forming the gasket. As the expandable material expands to fill the cavity and form the gasket, a portion of the material adjacent the mold line is received in an annular groove in one of the mold components so that flash is not formed at the mold line. One of the mold components also has an upwardly sloping ramp surface so that air and gas move along the ramp surface as the material expands and does not become trapped in the cavity, thus avoiding defects and blemishes in the gasket due to trapped air bubbles.

Abstract: An apparatus for the production of three-dimensional fiber-reinforced ceramics, which apparatus contains a foundation open at an upper end thereof and enclosing an empty space and a cylinder disposed on the foundation, the empty space of the foundation and an open space of the cylinder integrally forming a continuous empty space, and the continuous empty space having an empty region at a lowermost portion thereof having a filter plate set fast therein and having a pressure piston set fast above said filter plate to form between the pressure piston and the filter plate an empty region for accommodating a slurry for the production of the three-dimensional fiber-reinforced ceramics;wherein the filter plate contains a porous sintered metallic plate and a filter paper having holes not more than 0.3 .mu.

Abstract: A recyclable seal is formed on the surface of a climate control system door by placing the door into a mold having channels for receiving a foammelt, forming the foammelt by melting a solid sealant material and mixing a foaming agent therewith, supplying the foammelt mixture under a predetermined pressure to the mold so as to flow through the channels and through openings in the door to form an interconnected seal on opposite sides thereof, venting the channels along substantially the entire length thereof so as to maintain a relatively low differential pressure across the foammelt mixture to force the foaming agent to a center section of the seal so that a gas pocket is formed therein, and cooling the mold while supplying the foammelt mixture thereto.

Abstract: A process for the injection molding of objects having an outer layer of enamel and an inter layer of a plastic material is disclosed. According to the process, a liquid enamel is used. This enamel is injected by an enamel-injection apparatus through an enamel-injection die. A plastic melt passes through an injection unit into the cavity. According to the invention, the liquid enamel is injected into the flow path of the melt in the region before the cavity, before the melt is injected, so that the melt is encased by enamel before it is distributed in the cavity. Variations are also disclosed. For example, the form can be filled with enamel and the excess enamel drained. Then, the melted plastic material is introduced into the injection molding form. Also, the form can filled and then the capacity of the form increased to accommodate the melted plastic material. In any case, it is possible to use liquid enamels to enamel injection molded parts in the tool or form.

Abstract: A mold for encapsulating a transformer coil assembly in thermoplastic rubber includes a bottom mold portion having a mold cavity, an upstanding pin disposed within the mold cavity, a mold cover for closing the mold cavity, and a vent space positioned in the bottom surface of the mold cavity for venting gas within the mold cavity to the exterior of the mold during the injection of thermoplastic rubber into the mold cavity.

Abstract: A water-injection foaming devolatilizing method includes the steps of: melting and kneading a polymer in a water-injection dispersing zone of an extruder having a screw; injecting water into a polymer melt so as to be dispersed into the polymer melt which is being kneaded; and vaporizing volatile components contained in the polymer melt together with water in a devolatilizing zone having a vent port and located on a downstream side of the water-injection dispersing zone, so that the volatile components are removed and discharged through the vent port. A pressure-reducing expansion zone is provided between the water-injection dispersing zone and the devolatilizing zone so as to be upstream of the vent port. The method further includes gradually reducing a pressure in the pressure-reducing expansion zone so that not only bubbles in the water which is dispersed into the polymer melt are made to grow up, but also the bubbles are broken down at a downstream end portion of the pressure-reducing expansion zone.

Abstract: A plunger (22), used in a standard mold, has a vent seal device (23) and spring (24) that evacuates air through an exhaust port 26a, and channels 26 and 26b from the mold prior to moving the mold compound into the runner 27.

Abstract: Disclosed herein is a molding apparatus comprising a mold member at least partially defining a mold cavity including a vent, a valve comprising a valve housing including a bore having a central portion with first and second axially opposite ends, a first end portion communicating with the first end of the central portion and with the vent, and a second end portion communicating with the second end of the central portion, a vent discharge port, and a flushing discharge port, and a conduit including an inlet port communicating with the first end portion of the bore, an outlet port communicating with the second end portion of the bore, and a valve member located in the bore and being operably moveable between a venting position wherein the vent communicates with the conduit inlet port, wherein the conduit outlet port communicates with the vent discharge port, wherein communication between the flushing medium outlet port and the conduit inlet port is blocked, and wherein communication between the conduit outlet p

Abstract: A device for molding foam products including upper and lower portions cooperable to form a foam mold defining a mold cavity therein. The upper mold portion has at least one vent hole therein. A mechanism for providing the mold cavity with an expandable foam during a filling cycle is also provided. The expandable foam reactively expands when provided within the cavity so as to be molded into the shape of the cavity during a foaming cycle. The foam approaches the vent hole while expanding within the mold cavity during the foaming cycle. At least one vent hole provides a passage through which air and reaction product gases introduced into the cavity as a byproduct of the reactive expanding of the foam can escape to atmosphere from the cavity during the foaming cycle. A sensing and signal generating assembly detects the presence of the foam at a predetermined proximity to the at least one vent hole during the foaming cycle and generates a signal in response to the detection.

Abstract: A molding apparatus for producing a synthetic resin molded product including a forming mold with a molding cavity, a gate communicating with the cavity, and an overflow chamber communicating with the cavity through a flow-out passage, a gas blow-in mechanism for blowing gas into molten synthetic resin which has been injected into the cavity through the gate so as to form a void in the molten synthetic resin in the cavity to mold a hollow product and a flow-out passage opening and closing mechanism for closing the flow-out passage until the molten resin fills the molding cavity and opening the flow-out passage when the gas blow-in mechanism is in operation.

Abstract: A helmet making process includes the steps of opening the upper die with flash gates; heating the upper and lower dies in a oven with the use of an endless conveying device; inserting shape-molded plastic upper and lower shells respectively into the lower and upper and lower dies; filling a polyurethane mixture into the upper shell; shaking the upper and lower dies; heating the upper and lower dies to allow the polyurethane mixture to be foamed completely; piercing the foamed polyurethane through the air holes in the upper die; removing the semi-finished helmet; cooling the semi-finished helmet in air; cutting off the flashes and projected portions and recessed portions of the upper and lower shells; trimming and surface-treating the semi-finished helmet to form a finished helmet.

Abstract: A loudspeaker cone assembly having a generally conical cone body and an annular flexible suspension rim. In making the cone assembly, a cone body having an outer free edge is placed within a female mold having an annular channel configured to form the suspension rim with the free outer edge of the cone exposed to the channel. A predetermined quantity of liquid plastic foam is deposited into the channel which is then substantially closed by a male die so as to seal off the cone body adjacent its outer free edge. The foam is then expanded and cured so that the resulting annular rim is integrally impregnated into the free outer edge of the cone body and forms high density closed-cell outer skin surfaces on opposite sides of a low density closed-cell inner core to provide a suspension rim having improved flexibility, strength and durability. A color coating may be applied to selective exposed surface areas of the suspension rim.

Abstract: A method and apparatus for producing a molded polyurethane foam without using low-boiling solvents such as Freon and methylene chloride which present problems when used as a blowing agent. The polyurethane foam has the same good appearance and soft feeling as that produced with low-boiling solvents. A polyurethane foam is produced by injecting a polyurethane material into an evacuated cavity and permitting it to expand so that it flows and fills the cavity, said polyurethane material being composed of 100 parts by weight of polyol component and 0.1-0.6 part by weight of water as a blowing agent. The cavity pressure may be maintained high spontaneously or low while the polyurethane material is flowing in the cavity. When the polyurethane material has reached the final fill position in the cavity, the fore-end of the polyurethane material is discharged from the cavity.