METHOD FOR MANUFACTURING HOLLOW MOLDED ARTICLE, HOLLOW MOLDED ARTICLE, AND MANUFACTURING APPARATUS

摘要

A hollow molded article is formed by laser welding a container and a lid. The container and lid are each injection molded from a material containing a thermoplastic resin and have gate marks, formed during molding. The thermoplastic resin is oriented in the flow direction in a molten state and solidified. The entire gate mark of the container is located on its outer or bottom surface, but is present in a position other than an area at two-thirds or less of the distance from the center of gravity to the outer periphery of the bottom surface. The entire gate mark of the lid is located on its upper, side, or lower surface, but is present in a position other than areas at two-thirds or less of the distances from the centers of gravity of the upper and lower surfaces of the lid to the outer peripheries of the respective surfaces.

主权项

1. A hollow molded article comprising:
a container; and a lid for sealing said container; wherein said hollow molded article is formed by laser welding of said container and said lid; said container and said lid are each an injected molded article of a formation material comprising a thermoplastic resin, and comprise gate marks that have been formed during injection molding; said thermoplastic resin has a property of being solidified with being oriented in a flow direction in a molten state the entire gate mark in said container is presented in an outer surface or bottom surface of said container, provided that the entire gate mark is present, based on a distance from the center of gravity of the bottom surface in said container to an outer periphery of said bottom surface, in a position other than an area within two-thirds or less of said distance from said center of gravity; and the entire gate mark in said lid is presented in an upper surface, side surface, or lower surface of said lid, provided that the entire gate mark is present, based on a distance from the center of gravity of the upper surface in said lid to an outer periphery of said upper surface, in a position other than an area within two-thirds or less of said distance from the center of gravity of said upper surface as well as, based on a distance from the center of gravity of the lower surface in said lid to an outer periphery of said lower surface, in a position other than an area within two-thirds or less of said distance from the center of gravity of said lower surface.