Junkosha Inc.

Keiji Yoda

Hiroji Oda

Provided herein is a polyurethane tube having a small bending repulsive stress and superior inner-pressure creep characteristics in a flexible polyurethane tube. The present polyurethane tube has a bending repulsive stress of 0.035 N/mmor less, wherein the polyurethane tube is formed so that the difference between the storage elastic modulus E'at 30&#xb0; C. and the storage elastic modulus E&#x2032;at 80&#xb0; C. is 15% or less of E&#x2032;.

Polyurethane tube

A pipe joint includes a joint main body, a cap nut, a sleeve, an insertion groove between a pipe body mounting section and an external thread section of the joint main body, and an elastic member disposed in the insertion groove. When the external thread section and an internal thread section of the cap nut are screwed, the end face of the distal end side of the sleeve comes into contact with one end face of the elastic member to compress the elastic member, and the elastic member presses, with a self-repulsion force, the end face of the distal end side of the sleeve in the axial direction. Then, an inner circumferential surface of a proximal end side of the sleeve compresses the pipe body in a radial direction of the pipe body through a reaction force received from a fitting surface of the cap nut.

Growing community of inventors

Kasamashi, Japan

Keiji Yoda