METHOD FOR MANUFACTURING POLYMER INSULATION TUBE, AND POLYMER INSULATION TUBE

PROBLEM TO BE SOLVED: To provide, in a polymer insulation tube with deteriorated insulation property due to the outside environment, a method for manufacturing a polymer insulation tube in which the sheath can easily be replaced as well as the good insulation characteristics can be maintained.SOLUTION: The method for manufacturing a polymer insulation tube 1 in which the surface of an insulation tube main body 11 is covered with a sheathing member 12 made of macromolecule, includes: a step of preparing a macromolecule-made cylindrical body having an inner diameter not larger than the outer diameter R11 of the insulation tube main body 1, as the sheathing member 12; a step of expanding the inner diameter of said prepared sheathing member 12 to an inner diameter R12 not smaller than the outer diameter of the insulation tube main body; a step of inserting the diameter-expanded sheathing member 12 into the insulation tube main body 11; and a step of diameter-shrinking said inserted sheathing member 12 to mount it to the surface of the insulation tube main body 11.SELECTED DRAWING: Figure 2 【課題】外部環境に起因して絶縁特性が低下したポリマー碍管において、外被を容易に交換でき、かつ良好な絶縁特性を維持可能なポリマー碍管の製造方法を提供する。【解決手段】碍管本体１１の表面が、高分子製の外被材１２に覆われたポリマー碍管１の製造方法において、内径が碍管本体１の外径Ｒ１１以下である高分子製筒体を、外被材１２として準備するステップと、準備した外被材１２の内径を、前記碍管本体の外径以上の内径Ｒ１２に拡径するステップと、拡径した外被材１２を碍管本体１１に挿入するステップと、挿入した外被材１２を縮径して碍管本体１１の表面に装着するステップと、を有する。【選択図】図２