Patent ID: 11906077
Assignee: YACHIYO INDUSTRY CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A filler pipe having a bellows section that includes a peak and a valley and an ordinary section that does not include the bellows section, the filler pipe made of resin and comprising at least:
an inner layer;
a barrier layer; and
an outer layer, wherein
in the ordinary section, the inner layer is thinner than the outer layer,
the inner layer in the bellows section is thinner than the inner layer in the ordinary section, and
an increase rate of an inner layer proportion in the peak of the bellows section with respect to an inner layer proportion in the ordinary section is equal to or less than an increase rate of an outer layer proportion in the peak of the bellows section with respect to an outer layer proportion in the ordinary section.