The masterbatch contains a black pigment and a masterbatch thermoplastic resin, the masterbatch satisfying the following conditions: (Conditions) when a resin plate is produced by kneading 100 parts by weight of polypropylene having a melt flow rate of 30 g/10 min (JIS K7210:1999) and a density of 0.9 g/cm.sup.3 (JIS K7112:1999) with respect to 3 parts by weight of the masterbatch and subjecting the mixture to injection molding using a mold polished by a coated abrasive with a particle size of #800 (JIS R6001:1998), a* values and b* values of a surface of the resin plate in the L*a*b* color system satisfy specific conditions.

An injection molding apparatus for producing a plastics molding comprising a first component, a second component, and a third component comprises a first mold plate having at least 3 first mold nests, and a second mold plate having at least 3 second mold nests. In the closed state, the mold plates cooperate in the production of the plastics mold. In the opened state, the second mold plate is rotatable relative to the first mold plate. The at least 3 second mold nests comprise, in a case A), at least two second mold nests for injection molding the first component, and at least one second mold nest for injection molding the third component, or, in a case B), at least two second mold nests for injection molding the second component, and at least one second mold nest for injection molding the first component.

A molding die includes a first mold assembly, a second mold assembly, and a mold core. The first and second mold assemblies are adapted to be clamped together. The mold core defines a molding groove. The molding core is pressed between the first and second mold assemblies to form a molding cavity. The second mold assembly includes a light transmitting area corresponding to the molding cavity, so that the molding cavity will receive incident light through the light transmitting area. In the molding die, the first mold assembly, the second mold assembly, and the mold core cooperate to form the molding cavity, adhesive is injected into the molding cavity, and the molding cavity receives incident light through the light transmitting area, so that curing efficiency of the adhesive is improved, production efficiency is high, shape of molded adhesive is uniform, and product quality is improved.

A compression collar is manufactured for reinforcing an interference fit between an end of a pipe and a fitting. A precursor form is injection molded using a cold-expansion material. The precursor form has a tubular body with an initially closed axial end and a bore initially blind formed in the other axial end. Material is removed from the initially closed axial end to form an opening that connects to the bore thereby forming the compression collar. The opening has an inner periphery with a profile in axial cross section that is different than any profile in axial cross section of an inner periphery of the bore. The collar formed lacks knitlines and includes tabs which help to position the collar on a pipe.

1. A method for producing a holding device (1), wherein a light guide channel (2) is formed in the holding device (1) and extends from a first end section (2a) to a second end section (2b) of the holding device (1), wherein the first end section (2a) has a receiving region, in which a first optical element (3) can be fastened in a form-fitting manner, wherein the second end section (2b) has a stop surface (5) for the connection to a second optical element (4), and wherein the method comprises the following steps:

a) providing the first optical element (3),

b) providing an injection molding device for carrying out an injection molding process, wherein the injection molding device has two mold halves,

c) introducing the first optical element (3) into the first mold half of the injection molding device,

d) closing the mold halves,

e) forming the first end section (2a) of the holding device,

f) forming a shell of the holding device (1), which encloses the light guide channel (2),

g) forming the second end section (2b), which terminates the shell of the holding device (1), together with the stop surface (5).

1. A method for producing a holding device (1), wherein a light guide channel (2) is formed in the holding device (1) and extends from a first end section (2a) to a second end section (2b) of the holding device (1), wherein the first end section (2a) has a receiving region, in which a first optical element (3) can be fastened in a form-fitting manner, wherein the second end section (2b) has a stop surface (5) for the connection to a second optical element (4), and wherein the method comprises the following steps:

a) providing the first optical element (3),

b) providing an injection molding device for carrying out an injection molding process, wherein the injection molding device has two mold halves,

c) introducing the first optical element (3) into the first mold half of the injection molding device,

d) closing the mold halves,

e) forming the first end section (2a) of the holding device,

f) forming a shell of the holding device (1), which encloses the light guide channel (2),

g) forming the second end section (2b), which terminates the shell of the holding device (1), together with the stop surface (5).

A gear of a speed reducer of an actuator includes: an insert component; a center portion; an outer peripheral portion; a connecting portion; a gate mark; a weld-line portion; and a rib-shaped portion. The center portion surrounds the insert component. The outer peripheral portion includes a toothed portion and a toothless portion. The weld-line portion is formed in at least one of the center portion, the connecting portion and the outer peripheral portion at a location which is on a radially inner side of the toothless portion. The rib-shaped portion is formed in at least one of the center portion, the connecting portion and the outer peripheral portion at a location which includes the weld-line portion. The rib-shaped portion has a wall thickness that is larger than a wall thickness of another circumferential portion.

An injection molding apparatus includes: a mold that includes a fixed mold and a movable mold facing the fixed mold, and that is formed with a cavity partitioned by the fixed mold and the movable mold and a runner communicating with the cavity; a mold clamping unit configured to move the movable mold with respect to the fixed mold; an injection unit configured to inject a molding material into the cavity through the runner; a cutting mechanism that is provided at the mold and that includes a cutter projecting to the runner; a drive unit that is provided on the mold and that is configured to drive the cutting mechanism; and a control unit configured to control the injection unit, the mold clamping unit, and the drive unit. The control unit controls the injection unit to inject the molding material into the cavity, and then controls the drive unit to cause the cutter to project to the runner, thereby cutting the molding material hardened in the runner.

An injection molding apparatus includes: a mold that includes a fixed mold and a movable mold facing the fixed mold, and that is formed with a cavity partitioned by the fixed mold and the movable mold and a runner communicating with the cavity; a mold clamping unit configured to move the movable mold with respect to the fixed mold; an injection unit configured to inject a molding material into the cavity through the runner; a cutting mechanism that is provided at the mold and that includes a cutter projecting to the runner; a drive unit that is provided on the mold and that is configured to drive the cutting mechanism; and a control unit configured to control the injection unit, the mold clamping unit, and the drive unit. The control unit controls the injection unit to inject the molding material into the cavity, and then controls the drive unit to cause the cutter to project to the runner, thereby cutting the molding material hardened in the runner.

A molded product in which a parting line can be disposed at an inconspicuous position on the appearance of the product. The molded product includes a main body having a cylindrical shape and a hole penetrating through the main body in a radial direction, or a protrusion protruding in the radial direction from the main body, and in the molded product, a parting line corresponding to a matching surface of molds is formed in the molded product, and the parting line has a first line extending from the hole or the protrusion to one side in a circumferential direction of the main body, and a second line extending from an end point on the one direction of the circumferential direction of the first line to an end portion in an axial direction of the main body.