A device (6) for producing injection-molded parts (1) is provided, with the device device (6) having at least one cooling device (9) in which pre-molded parts (4) are cooled before the injection-molding of a further material component (3). A method is also provided with improvements in the technical field of the production of injection-molded parts (1), in particular of brushes or toothbrush bodies.

A method of manufacturing a liquid ejection head including a first step of having a molten resin becoming a first portion flow in between a first position in a first mold and a first position in a second mold and the molten resin becoming a second portion flow in between a second position in the first mold and a second position in the second mold; a second step of relatively moving the first and second molds, after opening the molds; a third step of closing the molds; a fourth step of joining the first and second portions, a fifth step of taking out the first and second portions and the sealing portion from the molds and mounting a recording element substrate; and a step of forming a space portion between a liquid supply path surface and a mounting surface.

A gear includes a center portion and a peripheral portion. The center portion includes a rotation support portion and an inner web. The peripheral portion includes an annular rim having teeth and an outer web, and made of a material different from a material of the center portion. One portion of the outer web is configured to hold one portion of the inner web. An outer surface of the one portion of the outer web is sloped such that a thickness of the outer web increases as the outer web extends from the rotation support portion toward the rim.

A bumper strip for a vehicle may include an upper surface portion forming an upper surface, a rear surface portion downwardly extending from the rear end portion of the upper surface portion and accommodated on a hood seating portion of the bumper, a matching portion cover of a shape extending in the rearward and downward directions from the rear surface portion, and a side surface portion forming a side surface, and wherein the upper surface portion, the rear surface portion, the matching portion cover and the side surface portion are integrally formed.

A resin molding method includes a first molding step of molding a first molded part and a second molded part in a mold and a second molding step of joining the first molded part and the second molded part. In the first molding step, the second molded part is formed by injecting resin into an area where a first core movable in the first direction and a second core movable in a second direction are engaged. In the second molding step, the second molded part is joined to the first molded part by injecting the resin while the first core is in contact with the second molded part and the second core is removed from the second molded part. Areas where the first core and the second core are located in the first molding step become hollow areas connected to each other and part of ends of the first core in the first direction is not in contact with the second core.

A mold for injection molding includes a design-surface-side mold which is capable of forming a design surface of a resin molded product and a non-design-surface-side mold which is capable of forming a mold cavity with the design-surface-side mold. A convex portion is provided in any one of the design-surface-side mold and the non-design-surface-side mold so as to protrude toward the other one. The mold for injection molding is configured to be capable of switching a first mold closing state in which the convex portion is present from any one of the design-surface-side mold and the non-design-surface-side mold over the other one and a second mold closing state in which the convex portion is not present from any one of the design-surface-side mold and the non-design-surface-side mold over the other one.

The present disclosure provides a mold of a resin body capable of reducing the cost of manufacturing a resin body including a resin base material and a foamed resin part provided on the resin base material. This mold is a mold of a resin body including resin base material molding die parts for molding a resin base material. The mold includes: a sliding part capable of sliding inside a foamed resin part molding cavity that communicates with a resin base material molding cavity of the resin base material molding die parts. The sliding part is swingably floated in a direction perpendicular to a sliding surface on which the sliding part slides. In the process of molding the resin base material, the sliding part blocks an opening part that communicates from the resin base material molding cavity to the foamed resin part molding cavity.

Provided is a method for manufacturing a sliding component including a protruding portion that is provided on the outer surface of a slider body portion of a slider so as to protrude into the inside of a penetrating portion provided in a part of a case body portion (wall portion) of a case. In some implementations, the penetrating portion and the protruding portion are formed in a state where an insert having an insert recess is advanced, and the insert is retreated in a mold to form the sliding component in which the slider is fitted in the case.

An instrument panel forming method is provided with: a first supply step for supplying a base material 103 that will form the base material part and the different material 303 that will form the different material part into the cavity; and a second supply step for opening, with the pressure applied on the different material 303 maintained to be greater than the pressure applied on the base material 103, the frame-shaped core 215 to bring the base material 103 into contact with the different material 303 and cause the different material 303 to protrude into the base material 103 in the central section of the boundary between the base material 103 and the different material 303 in the thickness direction of the base material 103 and the different material 303 where solidification of the base material 103 and the different material 303 is delayed.

A one-surface groove for wiring is formed in a front surface 2a, opposite-surface grooves for wiring are formed in a back surface 2b by protruding core members, and communication parts for allowing the one-surface groove and the opposite-surface grooves to communicate with each other are formed to shape a board section 2 made of a non-conductive resin. After the core members are retracted, a conduction-side resin, which will become conductive, is shaped in the one-surface groove, the opposite-surface grooves, and the communication parts to form front-side wiring 3, communication wirings 4, and back-side wirings 5, whereby a wiring circuit component is provided.