Method for filling and fabricating ink jet cartridge

Abstract

A method for filling an ink reservoir of an ink-jet cartridge. A cartridge is provided which includes a frame structure having an external frame structural member fabricated from a first rigid plastic material and an inner frame member fabricated from a second plastic material, the inner member lining an interior surface of the external frame member. The cartridge has first and second impervious membranes joined to the inner frame member to form, with the inner frame member, an ink reservoir for holding a supply of ink, and an ink fill port comprising a passage-way defined through the external frame member, the passage-way lined with said second material of said inner member and communicating with the interior of the reservoir. Ink is released into the reservoir from an ink supply through the fill port, which is then sealed. A method for forming a leak-resistent joint between the first and second plastic materials includes molding the second material into a predetermined first structure including a cavity defining the external periphery of an interior standpipe member, positioning the first structure into a mold for injecting the first material, injecting the first material in a molten state into the mold wherein the first material fills the outer periphery of the cavity and molds against the first structure to define the external periphery of the standpipe member, permitting the first material to cool, thereby forming a leak-resistent seal between the first and second materials about the standpipe member.