A method for manufacturing an elongated element (200) is provided. The method comprises arranging a molding cavity (101), defined by a mold (103) and a mold insert (104), said mold insert (104) comprising a mold core (105) and a displaceable mold cavity wall (106), said displaceable mold cavity wall (106) being arranged between the mold (103) and the mold core (105), such that the molding cavity has a start volume in a start position of the displaceable mold cavity wall (106). Then a liquid material is injected into a proximal end (102) of the molding cavity (101), where after the displaceable mold cavity wall (106) is displaced in relation to and along with the mold (103) and the mold core (105), distally during said injection, to increase the molding cavity volume from the start volume into an end volume at an end position of the displaceable mold cavity wall (106), wherein the molding cavity (101) in said end position of the displaceable mold cavity wall (106) corresponds to the elongated element (200). The liquid material is solidified, such that the elongated element (200) is formed, and the elongated element (200) and mold insert (104) is removed from said mold (103), where after the elongated element (200) is removed from said mold insert (104). An elongated element and a mold assembly for the manufacture thereof are also provided.

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.

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.

The present invention provides a die assembly for molding a resin-made insert having a sleeve that is inserted into an intake port of an internal combustion engine. Each sleeve has one inlet and two outlets. The die assembly includes an inner die and an outer die. The inner die includes an inlet side part and an outlet side part. The inlet side part and the outlet side part mold an inner peripheral surface of the sleeve in an assembled state, and are removed in mutually opposite directions. By means of this assembly, a sleeve having a complicated structure and shape can be molded easily.

Provided is a liquid silicone molding die, including a first mold base, having at least one first molding zone and a feed hole on one side thereof and having a feeding mechanism coupled to the feed hole on the other side thereof, wherein the feeding mechanism is coupled to an injection machine to inject a raw material, and a heating element is provided around the first molding zone; and a second mold base, operatively facing or separating from the first mold base, corresponding to the side of the first mold base and correspondingly provided with a second molding zone, an injection channel, a sealing ring groove and a sealing ring.

Provided is a liquid silicone molding die, including a first mold base, having at least one first molding zone and a feed hole on one side thereof and having a feeding mechanism coupled to the feed hole on the other side thereof, wherein the feeding mechanism is coupled to an injection machine to inject a raw material, and a heating element is provided around the first molding zone; and a second mold base, operatively facing or separating from the first mold base, corresponding to the side of the first mold base and correspondingly provided with a second molding zone, an injection channel, a sealing ring groove and a sealing ring.

An injection mold and a device for preparation of a light guide plate are provided by embodiments of the present disclosure. An injection mold, comprising a male mold and a female mold which cooperate with each other to define collectively a molding cavity adapted for molding a sheet component therein; a blowing device is provided in the male mold and configured to blow out gas with a predetermined pressure towards a bottom surface of the sheet component molded in the molding cavity to overcome at least partially a vacuum adsorption force between the bottom surface of the sheet component and an internal bottom surface of the molding cavity such that the sheet component is separated from the male mold. Therefore, the sheet component can be demoulded successfully and prevented from a relatively large warping deformation during a demoulding process such that the quality thereof can be guaranteed.

An injection mold and a device for preparation of a light guide plate are provided by embodiments of the present disclosure. An injection mold, comprising a male mold and a female mold which cooperate with each other to define collectively a molding cavity adapted for molding a sheet component therein; a blowing device is provided in the male mold and configured to blow out gas with a predetermined pressure towards a bottom surface of the sheet component molded in the molding cavity to overcome at least partially a vacuum adsorption force between the bottom surface of the sheet component and an internal bottom surface of the molding cavity such that the sheet component is separated from the male mold. Therefore, the sheet component can be demoulded successfully and prevented from a relatively large warping deformation during a demoulding process such that the quality thereof can be guaranteed.

An injection molding die is an injection molding die for molding a resin hollow body including a straight tubular portion having an inner peripheral surface that does not have a tapered portion for die removal. The injection molding die includes a core having a cylindrical portion configured to form the inner peripheral surface of the straight tubular portion. The core has a groove recessed inwardly in the radial direction and formed over a whole circumference of the cylindrical portion in an end portion of the core on a first side in the axial direction, the end portion corresponding to a rear end portion of the resin hollow body in the die-removal direction.

An injection molding die is an injection molding die for molding a resin hollow body including a straight tubular portion having an inner peripheral surface that does not have a tapered portion for die removal. The injection molding die includes a core having a cylindrical portion configured to form the inner peripheral surface of the straight tubular portion. The core has a groove recessed inwardly in the radial direction and formed over a whole circumference of the cylindrical portion in an end portion of the core on a first side in the axial direction, the end portion corresponding to a rear end portion of the resin hollow body in the die-removal direction.