Representative examples of the type III are, as an illustration, Teflon FEP160 commercially obtainable from DUPONT-MITSUI FLUORO CHEMICALS CO., LTD., and the like. Representative examples of the polyoxymethylene are, as an illustration, DELRIN commercially available from Du Pont, Celcon commercially available from Hoechst Celanese, and the like. As is obvious from the results proven in Tables 1 to 4, the management cables of the current invention produced in Examples are wonderful in initial load effectivity and cargo efficiency after the operation was carried out 1,000,000 occasions compared with the management cables produced in Comparative Examples when both the type of the thermoplastic resin used within the liner in Examples and that in Comparative Examples are the identical. The polybutylene terephthalate additionally has a characteristic that the distinction of the preliminary load effectivity and the load efficiency after the control cable is operated for a long time frame is small. When the content material of the organopolysiloxane is less than 13% by weight, the load efficiency is lowered when the control cable is used for a protracted time period. Also, since a liner containing a particular organopolysiloxane is used within the management cable of the current invention, wonderful load effectivity is continued for a protracted time period.
As talked about above, since the control cable of the present invention doesn't necessitate a lubricant, an issue concerning workability for coating a lubricant is solved and irregurality of load effectivity of products because of the uneveness of coating will not be generated. FIG. 1 is a partially-cut-off perspective view showing one embodiment of the pull type control cable of the current invention. The interior cable 1 was gone there and again 60 strokes per one minute. Also, when the melt index is simply too giant, the polybutylene terephthalate lacks toughness and cracks are generated in the inner coat, and the liner is often broken when the inner coat is quickly bent within the assembling strategy of a management cable. Accordingly, it is preferable that the melt index is 0.5 to 5 g/10 minutes. Accordingly, it is preferable that the melt index is at most 5 g/10 minutes. When the melt index is greater than 5 g/10 minutes, there is a tendency that oil resistance, stress cracking resistance and abrasion resistance deteriorate.
The polyoxymethylene is superb in abrasion resistance and has a low abrasion coefficiency. Also, it can be seen that the management cable produced in Comparative Examples, by which organopolysiloxane was contained solely within the thermoplastic resin of the internal coat, has low sturdiness. The polybutylene terephthalate is superb in thermal resistance, oil resistance and abrasion resistance, and has a low coefficient of friction. The kind II has a polymerization degree higher than the type I, and is superb in stress-cracking resistance. The smaller the melt index of the polybutylene terephthalate is, the larger the durability corresponding to abrasion resistance and stress-cracking resistance is, but it tends to be tough for finishing up the extrusion molding. Among the thermoplastic resins used within the internal coat, polybutylene terephthalate, excessive density polyethylene, polyoxymethylene and polyphenylene-sulfide are particularly preferable because these are glorious in abrasion resistance. Further, it can be seen that the management cable produced in Example 5, wherein organopolysiloxane was dispersively contained in thermoplastic resins of each the liner and the inner coat, has bodily properties virtually equal to the management cables produced in different Examples, by which organopolysiloxane was dispersively contained solely in the thermoplastic resin of the liner.
A thermoplastic resin proven in Tables 1 to 4 was heated to melt, and the organopolysiloxane obtained in the above was added thereto in a proportion shown in Tables 1 to 4. After they had been uniformly kneaded, shield control cable a liner having an inside diameter of 4.6 mm and an outdoor diameter of 5.6 mm was molded. The outside of the armor 5 is coated with the protective layer 6 having a thickness of 0.7 mm. Within the protecting layer 6, various supplies conventionally recognized such as polypropylene and polyvinyl chloride can be utilized. Next, the liner was inserted into a conduit having a protective layer product of polypropylene of 0.7 mm in thickness on the outside floor of a springy armor layer having an outside diameter of 8.6 mm. The conduit 2 is composed of an armor layer 5 and a protecting layer 6 of a artificial resin akin to polypropylene. Also, as a resin of the internal coat, a thermoplastic resin through which the above-mentioned organopolysiloxane is dispersively contained might be utilized in the identical method as within the above-mentioned liner. Examples of the thermoplastic resin are, as an example, polybutylene terephthalate, excessive density polyethylene, polyoxymethylene, a fluorocarbon resin represented by polytetrafluoroethylene, a polyamide represented by 6,6-nylon, polyphenylene sulfide, and the like, but the present invention just isn't limited by the exemplified ones.