The present invention addresses the problem of manufacturing first and second members with different materials when molding injection molding body one after another using first to third molds disposed at 120 degrees from each other on a turntable that performs reciprocating motion at 120 degrees and using fourth to sixth molds provided opposite to the first to third molds, respectively. According to the solution, first to third injection devices are disposed on the sides of fourth to sixth molds, respectively, the first injection device is caused to perform primary injection to mold a first member, and the second and third injection devices are caused to perform primary injection to mold a second member and secondary injection to integrate the first and second members with each other, whereby the first and second members can be manufactured with different materials one after another.

The present invention addresses the problem of manufacturing first and second members with different materials when molding injection molding body one after another using first to third molds disposed at 120 degrees from each other on a turntable that performs reciprocating motion at 120 degrees and using fourth to sixth molds provided opposite to the first to third molds, respectively. According to the solution, first to third injection devices are disposed on the sides of fourth to sixth molds, respectively, the first injection device is caused to perform primary injection to mold a first member, and the second and third injection devices are caused to perform primary injection to mold a second member and secondary injection to integrate the first and second members with each other, whereby the first and second members can be manufactured with different materials one after another.

An injection mold of a plastic preform includes first, second and third parts, the third part having a molding cavity defining an axis and adapted to be fixed to a first surface of a mold frame; the second part between the first and third parts slides along the axis to close or open the cavity. The first part includes a rod that slides along the axis through a second surface of the frame. The second part includes: a guiding cage through which the longitudinal rod can slide; a structure; and parallel guiding rods extending to the structure; an assembly sliding inside the cage; and a punch sliding inside the structure and defining a first complementary component of the cavity;
wherein the structure defines, together with the punch, a cam system for opening or closing two half-collars which define, when closed, a second complementary component of the cavity.

An injection mold of a plastic preform includes first, second and third parts, the third part having a molding cavity defining an axis and adapted to be fixed to a first surface of a mold frame; the second part between the first and third parts slides along the axis to close or open the cavity. The first part includes a rod that slides along the axis through a second surface of the frame. The second part includes: a guiding cage through which the longitudinal rod can slide; a structure; and parallel guiding rods extending to the structure; an assembly sliding inside the cage; and a punch sliding inside the structure and defining a first complementary component of the cavity;
wherein the structure defines, together with the punch, a cam system for opening or closing two half-collars which define, when closed, a second complementary component of the cavity.

An injection-compression plant for manufacturing PET performs comprises an extruder (1) to produce a melted resin, a distribution joint (3) for distributing the melted resin from the extruder (1) towards the injection-compression molds (9′, 9″, 9″), gathered in modular groups of three on supporting frames (21) arranged about the peripheral surface of the rotary carousel (2). The joint (3) allows to transfer the fluid thermoplastic resin from the stationary channel (10) of the extruder (1) to the lateral feeding conduit (27) of each molding module (9), said lateral feeding conduit being rotating with the carousel (2). The injection-compression molds (9′, 9″, 9″) have the two half-molds forming the molding cavity (41′, 41″, 41′″′) connected by means of bayonet couplings to the frame (21). The molded preforms are extracted from the carousel (2) by means of a wheel (50), which transfers them to an air cooling device (51).

An injection-compression plant for manufacturing PET performs comprises an extruder (1) to produce a melted resin, a distribution joint (3) for distributing the melted resin from the extruder (1) towards the injection-compression molds (9′, 9″, 9″), gathered in modular groups of three on supporting frames (21) arranged about the peripheral surface of the rotary carousel (2). The joint (3) allows to transfer the fluid thermoplastic resin from the stationary channel (10) of the extruder (1) to the lateral feeding conduit (27) of each molding module (9), said lateral feeding conduit being rotating with the carousel (2). The injection-compression molds (9′, 9″, 9″) have the two half-molds forming the molding cavity (41′, 41″, 41′″′) connected by means of bayonet couplings to the frame (21). The molded preforms are extracted from the carousel (2) by means of a wheel (50), which transfers them to an air cooling device (51).

An injection molding system includes an injection station, a molding device, and a plunger. The injection station includes a platform including an opening and an injector over the platform. The molding device is disposed between the platform and the injector and over the opening, wherein the molding device includes a mold cavity and a clamping unit for clamping the molding device. The plunger under the platform, wherein the plunger includes a base and a rod extendable through the opening toward the molding device and retractable toward the base. An injection molding method includes conveying a molding device to an injection station and disposing the molding device between an injector and a platform; disposing a plunger under the platform; moving the injector towards the molding device; applying a plunging force on the molding device by extending the rod through the opening; and injecting a molding material into a mold cavity.

An injection molding method includes providing a molding device including a first mold, a second mold over the first mold and a first mold cavity defined by the first mold and the second mold; injecting a first material into the first mold cavity; forming a first layer from the first material; replacing the second mold by a third mold, injecting a second material into a second mold cavity defined by the first mold and the third mold; and forming a second layer from the second material, wherein the second layer at least partially contacts the first layer. The first material is same as the second material.

A blow molding device includes: a base; an injection molding unit manufacturing a bottomed preform made of resin; a blow molding unit; a support part supporting the preform; and a conveying unit conveying the support part to the blow molding unit. The blow molding unit includes: a blow mold; a movement unit capable of moving the blow mold relative to the support part; one mold opening and closing mechanism; and a pair of mold opening and closing plates connected to the mold opening and closing mechanism. The moving unit is configured to move the blow mold in a non-coupling state to a position between the pair of mold opening and closing plates, the blow mold in the non-coupling state being not coupled to the pair of mold opening and closing plates and not located between the pair of mold opening and closing plates.

An injection molding apparatus 30 includes a turntable 5; first, second, and third molds disposed on the turntable 5; fourth, fifth, and sixth molds for opening and clamping the first, second, and third molds; and a first injection device 12, a second injection device 13, and a third injection device 14 for injecting a resin into the molds. Furthermore, the second injection device 13 and the third injection device 14 each include two injection ports, one of the two injection ports works as an injection port for primary and secondary injections, and the other is an injection port for a tertiary injection for injecting the resin along the outer peripheral portion of either one of a first member and a second member.