INJECTION MOLDING METHOD, ARTICLE, AND COINJECTION NOZZLE

摘要

PURPOSE: To provide a co-injection nozzle used in a multi-cavity and multi-layer injection molding machine or a blow molding machine and co-injecting at least three streams of a molten material in order to form a multilayered article. CONSTITUTION: A co-injection nozzle for co-injecting at least three streams of a molten material has an extending central passage 546, the gate communicating with the central passage and at least two polymer flow passages having annular fixed orifices. The taper part adjacent to either one of the orifices is provided to one of or both of the first and second passages, and thereby, each of the orifices has a cross-sectional gap which is smaller than each of the adjacent upstream parts of the respective passages and a third passage 440, having the orifice opened to the central passage is provided.