Abstract: A mold for injection compression molding, in which an elastic inner cavity with low rigidity and expandable in a direction perpendicular to the mold opening direction is provided in a rigid outer cavity, and when resin is filled in this inner cavity, the inner cavity expands due to a filling pressure of this resin, and when the mold is kept and cooled in a pressurized state, the inner cavity shrinks and a molded product with a desired thickness in a direction perpendicular to the mold opening direction can be obtained.

Abstract: A method of molding a layer around a body within a mold, in which the body is positioned within a mold cavity defined by opposing mold portions of the mold, to leave a cavity space between the body and the mold portions at least partially surrounding the body. Layer material is injected into the cavity space around the body when the mold portions are in a partially open position. The mold portions are compressed towards each other to a compression molding position to compression mold the layer material around the body.

Abstract: An injection-compression molding apparatus includes a stationary mold provided with a nozzle for injecting molten resin, and a movable mold driven by a servo motor. In compressing the resin, high-speed position control of the movable mold is first performed, which is then switched to speed feedback control which enables delicate regulation of clamping pressure in accordance with pressure fluctuations in the resin.

Abstract: A one-piece dispensing structure is molded by a process combining a co-injection molding first phase with a bi-injection molding second phase. In the first phase, a skin material and core material are co-injected into a mold cavity first region to form most of the major portion of the closure body. Subsequently, a movable shut-off member is retracted to expose an intermediate region which (1) is adjacent the closure structure hinge area and which (2) establishes communication between the mold cavity first region and another part of the mold cavity defining the closure lid portion. The skin material is injected through a second gate directly into the cavity intermediate region to fill the cavity intermediate region and the closure lid portion of the mold cavity. The skin material in the cavity intermediate region bonds to the previously injected skin material in the cavity first region adjacent the closure hinge.

Abstract: An apparatus for manufacturing a magnet roller makes it possible to remarkably reduce defects on the surface or the inside of a magnet roller and also to control “warp” of the magnet roller sufficiently so that it does not adversely affect the functions of the magnet roller. A metal mold for magnetic field injection molding is composed of two fixed mold counterparts and a movable mold counterpart. The movable mold counterpart is moved to increase the volume of the cavity of the metal mold as a resin-bonded magnet material is injected into the mold.

Abstract: The invention relates to a thermoplastic molded part comprising at least a polyolefin or a polycondensation polymer and reinforcing fibers, characterized in that 1 to 60 wt. % of the molded part consists of reinforcing fibers with a length of between 0.8 and 15 mm, at least a portion of which is present partly in the center and partly in the non-porous dish surface, and that the molded part has a porosity of between 5 and 95 vol. %. The invention also relates to a process for producing such a molded part.

Abstract: A mold insert member is provided to enable molding unitary composite parts from two materials so that the materials co-diffuse at their interface. The insert member is rotatable relative to a stationary molding die to define, in a first position, a first molding cavity for receiving a first molding material and, in a second position, a second molding cavity contiguous with the first molding cavity adapted to receive a first molding material. The insert member includes a substantially circular cylindrical main body portion defining a longitudinal axis. At least one arcuate mold lip is formed on an end of the main body portion and is adapted to cooperate with a molding die when the insert member is disposed in a first position relative to the molding die. At least one cavity area is formed on the end of the main body portion. The cavity area is adapted to define, together with the molding die, a second molding cavity when the insert member is rotated into a second position.

Abstract: A mold for compression molding a resin article, which mold consists of male and female molds, wherein, at the time of complete mold closing, the length L in a mold closing direction of a mated part formed between the outermost wall of said male mold and the innermost wall of said female mold satisfies the equation: (t1−t0+10)mm≧L≧(t1−t0)mm wherein t1 is a distance (mm) between the male and female molds when the resin melt first reaches the mating outermost edge of the male mold, and t0 is a distance (mm) in the mold closing direction between the same points on the male and female molds as those used for measuring t1 when the mold closing is complete, and the horizontal distance of a mating gap between the outermost wall surface of said male mold and the innermost wall surface of said female mold is from 0.02 to 0.1 mm, with which mold, squeeze-out of a resin melt during molding is prevented.

Abstract: Hard to fill large-surface-area parts and/or thinwalled configurations of optical lenses and reflective optical elements are among the difficult-to-mold thermoplastic products which require precision replication of the molding surfaces, in micro detail. We combine multiple opposing gates (to reduce the meltflow pathlength) with non-isothermal steps of firstly, heating these mold surfaces (with circulating heat transfer fluids supplied by a hot side supply system, to a temperature setpoint sufficiently high to retard solidification), then secondly, injecting the melt through these opposing gates, then thirdly, rapidly cooling to solidification (by circulating heat transfer fluids of much lower temperature, supplied from a cold side supply system).

Abstract: An articulated mold cavity is disclosed for injection molding a dispensing cap including a substantially hollow body adapted for attachment to a receptacle. The body includes an open first end shaped and dimensioned for coupling to the receptacle, a side wall and a substantially closed second end including a dispensing opening formed therein. The cap also includes a closure integrally formed with the body. The closure is pivotally formed to move between a closed position in which the closure covers the dispensing opening so as to prevent the flow of material through the dispensing opening and an open position in which the closure is removed from the dispensing opening to permit the flow of material through the dispensing opening. The mold cavity includes a stationary half supporting a plurality of moveable molding plates defining a moveable half of the mold cavity. The stationary half and the moveable half define therebetween a cavity in which the molded product is defined.

Abstract: A method and apparatus for injection molding of high quality thermoplastic parts is such that a conventional movable mold half is mounted on a movable platen of the injection molding machine, and a special stationary mold half is mounted on the stationary platen. The stationary mold half includes a stationary plate secured to the stationary platen, with the stationary plate including stationary mold inserts. Each stationary mold insert has a stationary mold insert surface. An A-half parting line plate is movably attached to the stationary plate, with the A-half parting line plate being movable with respect to the stationary plate and the stationary mold inserts. A driving device, such as a hydraulic cylinder, is disposed between the stationary plate and the A-half parting line plate, with the driving device driving the A-half parting line plate toward and away from the stationary plate.

Abstract: An apparatus for injection molding of a fiber optic ferrule including the use of adjustable core and receiver members to precisely locate a core pin and also a projecting wire member in a mold where the core pin defines an interior passage in the molded ferrule and the projecting wire forms a small diameter longitudinal hole in the ferrule communicating with an outer end of the interior passage so that the interior passage and small diameter hole are precisely located relative to the body of the molded ferrule.

Abstract: Disclosed are novel molding methods for manufacturing thin thermoplastic lenses and, in particular, minus ophthalmic lenses that have thickness of about 1 mm or less at the thinnest point thereof. The molding methods disclosed provide for lenses which lack any abrasion or polishing artifacts on the surface and also lack any negative fining marks below the nominal surface.

Abstract: A method and apparatus for injection molding of a fiber optic ferrule including the use of adjustable core and receiver members adjustable from the exterior of the mold to precisely locate a projecting wire member in a mold where a score pin defines an interior passage in the molded ferrule and the projecting wire forms a small diameter longitudinal hole in the ferrule communicating with an outer end of the interior passage so that the interior passage and small diameter hole are precisely located relative to the body of the molded ferrule.

Abstract: Stress-relieved molded acrylic opthalmic lenses, and injection-coining mold processes for molding stress-relieved plus and minus to high-minus diopter ophthalmic lenses of optically superior acrylic resin, able to pass standardized impact drop tests for use in eyeglass lenses, are described. The injection-coining processes use two-plate and three-plate mold assemblies. The cavity of a two plate runnerless mold is partially filled under partial tonnage, and the movable half of the mold controlled to coin and densify the acrylic resin under secondary or full tonnage, when a velocity-pressure changeover point is reached. In a process which employs a three-plate mold assembly, the lens mold cavities are partially filled under less than total clamp tonnage, with a cavity plate held by hydraulic pressure against movable half of the mold.

Abstract: A method for suppression of weld line weakening by virtually eliminating weld lines is disclosed. The process involves the near explosive injection of a metered amount of foamed thermoplastic molding material into an enclosing compartment formed by partly closing a compression type mold followed immediately by compression molding of the well mixed foamed material. The process finds particular utility in the manufacture of very long fiber reinforced parts. Variations on mold design and clamping cycles yield a variety of parts having foamed regions surrounded by more dense un-foamed regions. The method is particularly well adapted to the manufacture of large, very long fiber reinforced, foam-centered, hard surfaced, light weight, rigid parts.

Abstract: A compression apparatus for molding which applies uniform compression force to molten resin, and facilitates downsizing of the overall compression apparatus and attachment of the compression apparatus to a molding machine. Also, an injection compression molding machine and an injection compression molding method which use the compression apparatus for molding are disclosed. The compression apparatus is disposed in the rear of the movable mold of a die of a molding machine in which the movable mold is advanced toward the stationary mold of the die in order to apply compression force to the charged molten resin, to thereby mold the molten resin. The compression apparatus has a function of generating a pressing force for pushing the movable mold toward the stationary mold. The compression apparatus includes first and second slant members and having respective slant faces and in surface contact with each other. The slant members are advanced toward the slant members in order to generate pressing fore.

Abstract: A process of injection molding a foamable plastic composition which comprises filling completely a molten foamable plastic composition into a cavity, while reducing a volume of the cavity in the middle of injection or immediately after injection; cooling the composition to the state wherein a solidified layer in contact with a mold surface mingles with a molten inside layer; enlarging the volume of the cavity to that of the desired molded article; and after further cooling, removing the molded plastic foam article. This molded article comprises a layer having a non- or low-foamed, dense structure on the surface and a high-foamed layer at the inside, and has a light weight, good appearance and stiffness.

Abstract: A process for forming detergent bars comprising applying pressure to a detergent composition contained within a mould cavity. The detergent composition in the mould is in a substantially fluid or semi-solid state and the mould is substantially full before the pressure is applied.

Abstract: There is provided a process for producing a multi-layer molded product having a plurality of thermoplastic resin layers. This process provides for (i) a step of supplying first and second molten thermoplastic resins each through first and second resin supplying gates which are temperature-controllable independently of each other, to between female and male molds kept in an open state with a time difference being provided between supply starts of the first and second resins, and (ii) a step of closing the female and male molds after completion of supply of the first and second resins. The process enables production of high-quality multi-layer molded products having a plurality of resin layers with good repeatability under relatively low resin supply pressure and by single mold closing. Further, high-quality multi-layer molded products can readily be produced without restrictions on materials used.

Abstract: An article of manufacture, such as an encapsulated dual lens sealed instrument cover, includes four components, namely, a first lens having a peripheral edge encapsulated by a polymeric/polymeric injection molded encapsulation or border and a second lens also have a peripheral edge encapsulated by a second injection molded polymeric/copolymeric encapsulation or border. A hermetic chamber is thereby formed between the two lenses. The first encapsulation is also provided with threads or similar fastening means to readily secure the instrument cover to an instrument “can” containing any variety of instruments, such as a nautical compass, amperage/voltage, fuel, etc. The first lens is inserted into a cavity of a mold and the first encapsulation is injection molded thereabout. The latter two components are then assembled with respect to the second lens and the second encapsulation is injection molded thereabout.

Abstract: A molding apparatus intended to produce a flush finished part without any gate tab. The apparatus has a gate selectively movable between a first position permitting flow of mold medium from the cold runner to enter the mold cavity and a second position blocking such flow, the gate in the second position fully filling the opening and having a surface exposed to the mold cavity which surface is flush with the interior wall to.

Abstract: A molding method includes joining first and second molds to define a mold cavity; injecting a plastic into the mold cavity; and projecting the eject pin into the mold cavity with the molds joined together, thereby applying pressure to the plastic in the mold cavity.

Abstract: An injection molded product, having an array of fastener elements integrally molded with and extending from a surface of the product, is molded in a closed cavity die. One half of the die has a mold surface with a region having an array of fastener element cavities extending therefrom for molding the fastener elements. The other half of the die has a mold surface aligned with the mold surface of the first mold part to define therebetween, in a closed condition, a mold cavity constructed to receive molten plastic for molding the product. The mold cavity includes a first portion comprising a majority of the volume of the mold cavity, and a second portion contiguous with the first portion and defined in part by the region of the first mold part surface having the array of fastener element cavities.

Abstract: A process for producing closed or open hollow parts of molded synthetic resin material in which a core (12) or mold body which extends into the mold cavity and is attached to a form element and supported on other form elements is situated between two mold half-shells. The core is supported by one or more movable stops (13-18) which can be retracted from the mold cavity. Plastic is injected into the mold via a first injection channel (22) with the core retained in position by the stops (13-18). Subsequently the retaining stops (13-18) are retracted and the mold cavity is completely filled via a second injection channel (23, 24, 25).

Abstract: A molded article of a thermoplastic resin with good apperance which may have a skin material is produced by providing upper and lower molds having a product part-molding section and a non-product part-molding section, supplying a melt of a thermoplastic resin in a cavity of the molds or a space between the skin material and either one of the upper and lower molds through a resin melt passage which is formed in a wall of one of the molds and has an opening for supplying the melt in the non-product part-molding section when a clearance of the cavity is larger than a thickness of a finally produced article, closing the molds to effect press molding, cooling the molds.

Abstract: A manufacturing method of diaphragms for use in electroacoustic transducers simultaneously joins an edge and a diaphragm body upon molding the diaphragm body through an injection molding with a set of mating molds for forming the diaphragm body, with the edge of a cell-structure disposed on one of the mating molds, the edge being preliminarily molded and cut into a predetermined shape, and with the other mold mated with the one mold.

Abstract: A multi-stage method of insert molding is described including the steps of: providing a vertically movable first mold member with a cavity formed therein; providing a second mold member having a substantially flat upper molding surface; providing a third mold member having an upper end with a cavity formed therein; positioning an insert directly on the flat upper molding surface of the second mold member; positioning the first mold member with respect to the second mold member so that the cavity of the first mold member receives the insert; injecting a first flowable plastic material into the cavity in the first mold member to partially encapsulate the insert; allowing the first flowable plastic material to cool and solidify, thereby creating a first stage molding; removing the first mold member and the second stage molding from the second mold member; positioning the first mold member with respect to the third mold member so that the first stage molding registers with the cavity of the third mold member; inj

Abstract: A method of in-mold coating, comprising steps of forming a molded product by applying a clamping pressure to a mold to mold a synthetic resin molding material in the mold according to an injection molding method, an injection compression molding method or an injection press molding method, then coating a surface of the molded product with a coating material in the mold, wherein the coating material is injected in such a state that the molded product has cured or solidified to such an extent that the surface of the molded product can withstand an injection pressure and a flow pressure of the coating material, and the clamping of the mold after injection of the coating material is carried out under certain multistagewise variable clamping pressures with certain clamping pressure transitional periods of time.