An apparatus and method for heating and cooling a polymer structure (12) employs a tube structure (10).

The passenger hit the steel tube structure of the fuselage and was stunned.

The metal Green eco chair is a version with a steel tube structure.

A vacuum heat insulation tube is a double structure tube having the inner tube and the outer tube.

The internal core tube further functions as a rigid structural support for the external filtering structure.

Also disclosed is a tube material of a wall tube with a reinforced thermoplastic composite structure using the strip material of the wall tube with the reinforced thermoplastic composite structure.

The exhaust pipe (2) and the first and second mufflers (4) and (5) have a double pipe structure the outside of which is plated.

The chimney structure includes an inner tube within an outer tube.

The discharge tube (11) has a double-tube structure including an outer tube (12) and an inner tube (13).

Also disclosed is a tube material of a wall tube with a reinforced thermoplastic composite structure manufactured by using the strip material of the wall tube with the reinforced thermoplastic composite structure.

It has a double-tube structure comprising an inner tube (2) and an outer tube (3).

The outer peripheral surface of the tube is provided with a spiral structure.

The plastic tube comprises an elongated thin plastic tubing that is compressed into a ring-shaped structure, allowing one end of the tube to be withdrawn to a desired length.

The inner structure may be an inner wall or inner tube.

The tube has a multiple tube structure.