| 摘要 |
<p>PURPOSE:To prevent the remaining of bubbles between the tube and the object to be covered by providing the multi number of piercing holes which are to be clogged by heating and foaming on the pipe wall. CONSTITUTION:The foaming tube 3 is fitted in the pressure pipe 2 with a pressure port 1, and the tube 3 is heated to be softened at the temperature below the resolution temperture of the foaming agent. The appropriate kind of gas is injected into the tube 4 by pressure from the pressure port 1 to enlarge the diameter of the tube 3 until it touches the inside wall surface 5 of the pressure pipe 2. Then, the foaming thermal contraxtion tube is completed by making multi number of piercing holes in the wall of the foaming tube 3 with the thermal contractibility given by the diameter-enlarging treatment. When it is used, the foaming thermal contraction tube is to be heated to the softening point of the thermo-plastic polymer so that it is heated to start foaming after covering the object with the foaming thermal contraction tube. In that case, the tube contracts and starts foaming, adhering tightly to the object, and the air escapes from the piercing holes which are clogged when the object is covered by the tube in the end.</p> |
