US 7,320,769 B2 | ||
Manufacturing method of fuel tank welding joint | ||
Tomohide Aoki, Aichi-ken (Japan); Hiroaki Kito, Aichi-ken (Japan); Hiroshi Nishi, Aichi-ken (Japan); and Masayuki Nakagawa, Aichi-ken (Japan) | ||
Assigned to Toyoda Gosei Co., Ltd., Aichi-ken (Japan) | ||
Filed on Mar. 02, 2004, as Appl. No. 10/790,030. | ||
Application 10/790030 is a continuation of application No. 10/084657, filed on Feb. 28, 2002, abandoned. | ||
Claims priority of application No. 2001-56806 (JP), filed on Mar. 01, 2001. | ||
Prior Publication US 2004/0164463 A1, Aug. 26, 2004 | ||
Int. Cl. B29C 45/14 (2006.01); B29C 45/16 (2006.01) |
U.S. Cl. 264—250 [264/255; 264/269] | 14 Claims |
1. A method for manufacturing a fuel tank welding joint for connecting a fuel tank to a prescribed member, the method comprising:
forming a joint main body made of a first resin material configured to be welded to a wall of the fuel tank, the joint main
body including (i) a welded edge portion to be thermally welded to the wall of the fuel tank and (ii) a tube portion for connecting
a hose, the tube portion having a connecting passage to connect an interior of the fuel tank and the prescribed member; and
forming a barrier layer by injecting a second resin material into a cavity of a mold unit in which the joint main body has
been set, the second resin material being adhesively and chemically reactive with the first resin material and more fuel-impermeable
than the first resin material,
wherein forming the barrier layer includes (i) allowing the second resin material to flow through an end of the tube portion
into the cavity, so as to form an end portion, and (ii) allowing the second resin material to flow toward the welded edge
portion, so as to form a lower end of the barrier layer with a gap from the welded edge portion, and
the first resin material includes a modified olefinic resin containing a polar functional group and the second resin material
is selected from the group of polyamide and polyacetal, and an injection temperature of the second resin material is higher
than that of the first resin material.
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