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|1. (WO2017056846) FILLER TUBE AND METHOD FOR MANUFACTURING SAME|
|Applicants:||SUMITOMO RIKO COMPANY LIMITED
|Title:||FILLER TUBE AND METHOD FOR MANUFACTURING SAME|
Provided is a filler tube that is capable of favorably complying with a request function that corresponds to a bellows section and a non-bellows cylindrical base section, while ensuring fuel-permeability resistance properties and weld strength and at the welding surface. A filler tube (30) is provided with a non-bellows cylindrical base section (31) measuring 2–4 mm in total wall thickness, a bellows section (32) measuring 0.5–3 mm in total wall thickness, and a flange part (35) measuring 3.5–5 mm in total wall thickness and having an end surface that is welded to a fuel tank (10). The base part (31), the bellows part (32), and the flange part (35) are provided with inner layers (31a, 32a, 35a) formed to a thickness that is 40–60% of the total wall thickness and principally formed of high-density polyethylene (HDPE), intermediate layers (31b, 32b, 35b) having fuel-permeability resistance properties, and outer layers (31c, 32c, 35c) for protecting the intermediate layers (31b, 32b, 35b).