| 摘要 |
<p>PROBLEM TO BE SOLVED: To uniform shrinkage percentage in heat shrinkage by laminating a bridged slirinking tube material which includes polyolefine and carbon black in two layers or more, and making bridging percentage of an internal layer larger than that of an adjacent external layer. SOLUTION: In a shrinking tube 20, bridged shrinking tube members 21, 22 which include polyolefine and carbon black are laminated in two layers as an internal layer and an external layer respectively. The bridging percentage of the external layer 21 is 50% and that of the internal layer 22 is 80%, namely, the bridging percentage of the internal layer 22 is larger than that of the external layer 21. When a body to be attached is inserted into the inner diameter and is heated by infrared heater or the like, it shrinks and comes into close contact with the body to be attached. However, shrinkage occurs in a lengthwise direction as well as in a bore direction of the shrinking tube 20, and higher shrinking force occurs as the bridging percentage becomes larger, therefore, the internal layer 22 shrinks higher than the external layer 21. As a result, the shrinking tube is crimped against the body to be attached strongly by the resultant force of shrinking force in the bore direction and that in a lengthwise direction, thus making it possible to bring the tube into uniformly close contact in the lengthwise direction.</p> |
