| 摘要 |
<p>A method for making a corrugated flexible and extensible metal tube having a thermally shrinking protective sheath is characterized in that said method comprises the steps of:
a) extending or stretching a flexible tube to an allowable maximum length, as specified in a tube technical specification;
b) fitting a loose thermoshrinking sheath (1) on the flexible tube;
c) assembling a suction union (5) on the flexible tube (2) and sheath (1) assembly;
d) pre-heating the thermoshrinking sheath at a region (A) thereof;
e) further pre-heating said thermoshrinking sheath at a further region (B) thereof, while optionally simultaneously heating said region (A) and region (B);
f) sucking air from the sheath (1) and flexible tube (2) by a suction device coupled to a suction union;
g) heating the flexible tube (2) by a D.C, current source or other heating means to cause said thermally shrinking sheath (1) to be fully shrunk so as to fully adhere to a corrugated surface of said flexible tube and to its end fitting at a suction union side;
h) removing from the sheathed flexible tube the used operating tools and trimming away the excess sheath; and
i) pressing the sheathed flexible tube so as to cause the flexible tube corrugations covered by the protective sheath to contact one another.
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