The invention relates to a dart head for a toy dart, comprising a body having a hollow stem portion integrally formed with and longitudinally extending from an enlarged, hollow head portion; the head portion and the stem portion being fluidly connected, with the head portion defining at least one first transverse internal head dimension, and the stem portion defining at least one first transverse internal stem dimension; wherein the at least one first transverse internal head dimension is larger than the at least one first transverse internal stem dimension. The invention also relates to a toy dart comprising a dart body connectable with the dart head as described, and a method of manufacturing the dart head as described.

A mold structure includes a fixed mold and a movable mold, and a first insert and a second insert disposed in the movable mold. A molded product includes a plate-shaped body, a side wall, and a wrapped portion. The side wall has a basal end region that is curved and connected to the body. The first insert is located at a position corresponding to the side wall inside the molded product. The second insert is located at a position corresponding to the body inside the molded product. The second insert has a contact surface for the molded product. When the mold structure is clamped, an edge of the contact surface is located closer to a distal end of the side wall than a position where the basal end region of the side wall is connected to the body.

A mold structure includes a fixed mold and a movable mold, and a first insert and a second insert disposed in the movable mold. A molded product includes a plate-shaped body, a side wall, and a wrapped portion. The side wall has a basal end region that is curved and connected to the body. The first insert is located at a position corresponding to the side wall inside the molded product. The second insert is located at a position corresponding to the body inside the molded product. The second insert has a contact surface for the molded product. When the mold structure is clamped, an edge of the contact surface is located closer to a distal end of the side wall than a position where the basal end region of the side wall is connected to the body.

The invention provides a molding apparatus comprising a first mold part operative to hold a semiconductor substrate, and a second mold part having a main surface facing the first mold part. The first and second mold parts are movable relative to each other between an open arrangement and a closed arrangement. The main surface comprises portions defining a mold cavity, and a recess at least partially surrounding the mold cavity. The main surface also comprises a compressible structure located within the recess, wherein at least a portion of the compressible structure extends out of the recess towards the first mold part and is compressible into the recess when the compressible structure contacts the semiconductor substrate in the closed arrangement. The second mold part also comprises one or more air conduits operative to introduce compressed air into the mold cavity.

The invention provides a molding apparatus comprising a first mold part operative to hold a semiconductor substrate, and a second mold part having a main surface facing the first mold part. The first and second mold parts are movable relative to each other between an open arrangement and a closed arrangement. The main surface comprises portions defining a mold cavity, and a recess at least partially surrounding the mold cavity. The main surface also comprises a compressible structure located within the recess, wherein at least a portion of the compressible structure extends out of the recess towards the first mold part and is compressible into the recess when the compressible structure contacts the semiconductor substrate in the closed arrangement. The second mold part also comprises one or more air conduits operative to introduce compressed air into the mold cavity.

The device for the suction of air in injection molds and the subsequent expulsion of molded pieces has a Venturi ejector connected to a first valve, that when the mold is closed causes the suction of air in a mold cavity, having at least one insert made from porous material through which and by means of a communication duct that defines a suction circuit, and a second valve, that after the solidification of the plastic material, causes the air to be blown towards the at least one insert made of porous material, cleaning the at least one insert made of porous material. The volume of air to be reduced in the second part of the injection cycle with the same empirical value of 90% efficiency of the Venturi ejector.

To provide an injection molding device capable of injection-molding a molded article in a tubular shape with a constant inner diameter by using a core with a simple structure with no draft angle. An injection molding device that injection-molds a molded article in a tubular shape with a constant inner diameter includes: a first mold and a second mold that form a cavity in a clamped state; a first core and a second core that are formed by splitting a core in a columnar shape disposed inside the cavity and have split surfaces inclined with respect to an axial center direction of the core and split from one end to the other end of the cavity in the axial center direction; and a slider that causes the first core or the second core to move in a sliding manner and be inserted into and pulled out of the cavity, in which the slider causes the first core or the second core to slide in a direction in which an angle formed with the axial center direction is within a range of greater than 0 degrees and less than an inclination angle of the split surface in a sectional view including the axial center and perpendicularly intersecting the split surface.

To provide an injection molding device capable of injection-molding a molded article in a tubular shape with a constant inner diameter by using a core with a simple structure with no draft angle. An injection molding device that injection-molds a molded article in a tubular shape with a constant inner diameter includes: a first mold and a second mold that form a cavity in a clamped state; a first core and a second core that are formed by splitting a core in a columnar shape disposed inside the cavity and have split surfaces inclined with respect to an axial center direction of the core and split from one end to the other end of the cavity in the axial center direction; and a slider that causes the first core or the second core to move in a sliding manner and be inserted into and pulled out of the cavity, in which the slider causes the first core or the second core to slide in a direction in which an angle formed with the axial center direction is within a range of greater than 0 degrees and less than an inclination angle of the split surface in a sectional view including the axial center and perpendicularly intersecting the split surface.

A compressed air is ejected from air ejector ports (14) to between a mold surface defining cavity (12) of mold (7) and a surface of a hot melt resin layer after starting to fill or inject the hot melt resin material into cavity (12) and before a temperature of the hot melt resin material becomes equal to or lower than a softening point thereof. Recesses (Q) are formed by positively generating a sink mark on a surface of edge protector (6) by ejection of the compressed air, and at the same time, gap (G) is formed between the surface of edge protector (6) and the mold surface. As a result, when bead-shaped edge protector (6) is integrally formed in long-side heat-fused portions (5c) of laminated-film exterior package case (5) by using a thermoplastic hot melt resin material, mold releasability of the molded edge protector from the mold can be enhanced.

Provided is a structure in which an inserted article is easily inserted and a product is easily released from a die after molding. The structure includes a positioning mechanism which is vertically arranged on one split die, includes a positioning pin having a tapered distal end, and positions the inserted article by engaging the inserted article with the positioning pin, a stop mechanism that has a spring means assembled with the one split die and a stopper portion held by the spring means, and temporarily stops movement of the other split die when the other split die comes into contact with the stopper portion at the time of mold clamping, and a pressing mechanism that has a spring assembled with the other split die, a pusher pin, a spring assembled with the one split die, and a pusher pin, and elastically presses the inserted article by the pusher pin.