Patent 2017202049

Preform injection molding device, injection molding method, and synthetic resin bottle

Abstract

PREFORM INJECTION MOLDING DEVICE, INJECTION MOLDING METHOD, AND SYNTHETIC RESIN BOTTLE ABSTRACT An injection molding device to be used molding a laminated preform (101) which is used in biaxial stretching and blow molding, having a shape of a test tube and having a second resin layer or layers (101b) laminated with a main resin layer (101a) that makes up a shape of the preform, the injection molding device comprising a nozzle section (11), in which a molten main resin (Ra) to be formed into the main resin layer (101a) is made to join a molten second resin (Rb) to be formed into the second resin layer or layers (10 1b) so that a joined resin mass is formed, and a mold (1) disposed ahead of this nozzle section (11), the nozzle section (11) described in an order of from outside to inside comprising an outer flow channel (15a) through which the main resin (Ra) flows, an inner flow channel (15b) through which the second resin (Rb) flows, a cylindrical column-shaped joined flow channel (19) where the second resin (Rb) from the inner flow channel (15b) joins the main resin (Ra) from the outer flow channel (15 a), a first confluence (17a) disposed at a point where the main resin (Ra) from the outer flow channel (15a) flows into the joined flow channel (19), a second confluence (17b) disposed at a point where the second resin (Rb) flows into the joined flow channel (19) wherein the first confluence (17a) is located downstream of the second confluence (17b) with a predetermined space left in between, and a cylindrical shutoff pin (20) inserted slidably in the joined flow channel (19), wherein the shutoff pin (20) is capable of shutting off or opening either or both of the first confluence (17a) and/or the second confluence (17b), depending on the sliding position, and wherein the resins are brought to join and flow through the joined flow channel (19) together, while forming the joined resin mass in a cylindrical column-shape, and the joined resin mass is then injected into a mold cavity (4) by way of a pin gate (5) disposed at a position corresponding to the center of a bottom wall of the preform (101) to be formed in the mold cavity (4).

Information

Australian application number
2017202049
Country
JP
Status
Filed
Type
Standard
Applicant
Yoshino Kogyosho Co., Ltd., LTD (JP)
Application year
2017

International Patent Classification (IPC) codes

Links

ID Relationship
2012248612 Divisional parent