A molding apparatus includes a mold comprising a stationary outer mold with a substantially tubular mold cavity, a moveable end mold with an end mold cavity alignable with the tubular mold cavity, and a stationary elongated mold core with a fluid channel therethrough, the mold core extending through the tubular cavity into the end mold cavity. A method of using the apparatus includes injecting a molding material at a material flow rate into the mold, moving the end mold at a speed in a linear direction from a first position to a second position, supplying a fluid at a fluid flow rate to the fluid channel, and varying at least one of the material flow rate, the end mold speed and the fluid flow rate as the end mold moves from the first position to the second position.

A method of manufacturing a molded part includes inserting melt into a cavity of a first tool part, and the first tool part and a second tool part are moved away from one another during or after the insertion of the melt by moving a second mold clamping plate relative to a first mold clamping plate such that in the first tool part or in the second tool part clearance space of a first or second cavity portion of the cavity is created, and a gap is formed between the first tool part and the second tool part. Melt is further inserted into the clearance space of the cavity, and the gap is bridged by an at least already partially solidified section of the melt. A holding force is transmitted from the second tool part to the first tool part through the partially solidified section of the melt bridging the gap.

A method for manufacturing an object having a polymer part, including inserting a core through a movable element via a hole passing through the movable element, inserting the polymer part in a mould, inside which the movable element is arranged, so that the polymer part is in contact with the movable element on a first side of the movable element, displacing the movable element in the mould by exerting a force, originating from the polymer part, on the movable element in such a way that the movable element slides along the core, the movable element constraining, at an entrance of the hole on the first side, at each instant and as the movable element is displaced, the position of the portion of the core in the course of being covered with polymer at this instant.

A molding apparatus includes a mold comprising a stationary outer mold with a substantially tubular mold cavity, a moveable end mold with an end mold cavity alignable with the tubular mold cavity, and a stationary elongated mold core with a fluid channel therethrough, the mold core extending through the tubular cavity into the end mold cavity. A method of using the apparatus includes injecting a molding material at a material flow rate into the mold, moving the end mold at a speed in a linear direction from a first position to a second position, supplying a fluid at a fluid flow rate to the fluid channel, and varying at least one of the material flow rate, the end mold speed and the fluid flow rate as the end mold moves from the first position to the second position.

A molding apparatus includes a mold comprising a stationary outer mold with a substantially tubular mold cavity, a moveable end mold with an end mold cavity alignable with the tubular mold cavity, and a stationary elongated mold core with a fluid channel therethrough, the mold core extending through the tubular cavity into the end mold cavity. A method of using the apparatus includes injecting a molding material at a material flow rate into the mold, moving the end mold at a speed in a linear direction from a first position to a second position, supplying a fluid at a fluid flow rate to the fluid channel, and varying at least one of the material flow rate, the end mold speed and the fluid flow rate as the end mold moves from the first position to the second position.

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.

A method for manufacturing an object having a polymer part, including inserting a core through a movable element via a hole passing through the movable element, inserting the polymer part in a mould, inside which the movable element is arranged, so that the polymer part is in contact with the movable element on a first side of the movable element, displacing the movable element in the mould by exerting a force, originating from the polymer part, on the movable element in such a way that the movable element slides along the core, the movable element constraining, at an entrance of the hole on the first side, at each instant and as the movable element is displaced, the position of the portion of the core in the course of being covered with polymer at this instant.

A method that combines injection molding and extrusion is disclosed. First, a molten material is injected into a mold via an injection gate, the mold comprising a first portion and a second portion. Next, additional molten material is injected via the injection gate and pushed through an extrusion die located in the first portion of the mold and the second portion is separated from the first portion. In embodiments, the second portion is separated from the first portion before the additional material is injected. In other embodiments, the second portion is separated from the first portion simultaneously with the additional material being injected. The method may be used to produce longer and thinner parts with detailed features, such as catheters.

In a stator injection molding centralization technique, a mold core is disposed inside a stator tube, thereby forming an annulus between the stator tube and mold core. The mold core includes a pitch length defined between a first and second lobe tip of the mold core. A centralizing member is positioned in the annulus, which has a length at least as long as the pitch length of the mold core. During the injection molding process, elastomeric material is injected into the annulus behind the centralizing member, which is located adjacent to the injection point. As the elastomer is injected, it displaces the centralizing member ahead of it along the annulus. As the centralizing member moves through the annulus, it supports the mold core, thus preventing the sag effect.

The invention aims to increase concentricity compared to conventional centering methods in a 3D extrusion cycle, using a pressure-controlled or floating centering lance. The invention proposes a device (10) for moulding an elongate component (44), comprising: a moulding arrangement (12) with at least one gate point; and a mould insert (22) that can be received in said moulding arrangement (12) and displaced along a displacement axis (V) relative to the gate point (18), said mould insert (22) at least partly delimiting a cavity (28) in which a solidifying moulding compound (21) added via the gate point (18) can be received, and said device (10) additionally comprising a centering element (34) which is configured to receive an elongate component (44) and guide it along a centering axis (Z) into said cavity (28). The device (10) is also accompanied by a method for moulding an elongate component (44).