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

摘要

While naturally suctioning air between a first thermoplastic resin sheet (20) and a second thermoplastic resin sheet (21) from a fluid passage (23) formed in a first thermoplastic resin sheet (20), the first thermoplastic resin sheet (20) is subjected to vacuum-molding by a first vacuum molding die (2), a first shaping section is formed in the first thermoplastic resin sheet (20) by a molded section (5) of the first vacuum molding die (2), the second thermoplastic resin sheet (21) is subjected to vacuum-molding by a second vacuum molding die (3), a second shaping section is formed in the second thermoplastic resin sheet (21) by the molded section (11) of the second vacuum molding die (3), and a hollow section (300) is defined between the first thermoplastic resin sheet (20) and the second thermoplastic resin sheet (21) by the first shaping section and the second shaping section.

主权项

1. A method for manufacturing a hollow molded article, the method comprising:
forming a fluid passage having a through-hole in a first thermoplastic resin sheet to be vacuum-molded by a first vacuum molding die; heating and softening a second thermoplastic resin sheet to be vacuum-molded by a second vacuum molding die and the first thermoplastic resin sheet; holding both the sheets by the first and second vacuum molding dies, in a state where the first and second vacuum molding dies are clamped and the first and second thermoplastic resin sheets are superimposed, sealing a molding surface of the first vacuum molding die by the first the thermoplastic resin sheet, sealing a molding surface of the second vacuum molding die by the second thermoplastic resin sheet, joining the first and second heat thermoplastic resin sheets around the molding surfaces of the first and second vacuum molding dies, and connecting an opening on the first vacuum molding die side among the openings of the fluid passage to a fluid supply source; performing vacuum-molding of the first thermoplastic resin sheet by the first vacuum molding die, forming a first shaping section in the first thermoplastic resin sheet by a molded section of the first vacuum molding die, performing vacuum-molding of the second thermoplastic resin sheet by the second vacuum molding die, forming a second shaping section in the second thermoplastic resin sheet by a molded section of the second vacuum molding die, and defining a hollow section between the first thermoplastic resin sheet and the second thermoplastic resin sheet by the first shaping section and the second shaping section, by suctioning air from the fluid supply source into between the first thermoplastic resin sheet and the second thermoplastic resin sheet through the fluid passage, accompanying the process of molding of the first shaping section and the second shaping section; and opening the first and second vacuum molding dies to take out a molded article having the hollow section.