Eight Life-Saving Recommendations on Shield Control Cable > 자유게시판

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As mentioned above, because 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 efficiency of merchandise due to the uneveness of coating isn't generated. However, there are a number of problems, within the management cable in which a lubricant is used, comparable to problem of operation for coating as a result of dispersion of the load efficiency of products is brought on by the unevenness of a coating, rubbishes and dusts are easily adhered to the lubricant when making use of the lubricant to the control cable, shield control cable and drip and the like are generated. As an example, in case the scarcity of lubricants is generated because of the long period use of the control cable, there are some issues that the liner is thoroughly worn down and the operationability of the control cable is excessively lowered, and the like. When the particle dimension of the powder is less than 5 .mu.m, a pinholl is well generated as a result of the powder is agglomerated. With respect to Examples 12 to 15 and Comparative Examples 12 to 14, in accordance with a paste-extrusion method, 18 elements by weight of kerosene was added to 100 components by weight of polytetrafluoroethylene powder (common particle dimension 25 .mu.m) and kneaded to offer paste, and the paste was extruded beneath excessive stress to provide a tube.

When the paste-extrusion methodology is employed, it's preferable that paste is ready by adding kerosene to polytetrafluoroethylene powder and kneading them, the paste is extruded to offer a tube below high pressure and a stranded steel wire is coated with the tube, and after that, the stranded steel wire is dried and baked in a furnace similar to an electric furnace. When the content is more that 20% by weight, an extruded product can't be produced as a result of a slip of a resin happens on a cylinder barrel in an extruder and the fixed feed of the resin cannot be carried out. However, when a organopolysiloxane having too low a viscosity is contained in a large quantity within the resin, there's an issue that the organopolysiloxane cannot be successfully extruded to supply a liner, and thus the molding can't be carried out because of the slipping of the resin on the cylinder barrel within the extruder. When the content of the organopolysiloxane having an ultra-excessive viscosity is less that 45% by weight and the content material of the organopolysiloxane having a decrease viscosity is more that 55% by weight, an extruded product can't be produced because a slide between a screw and a resin happens in an extruder and the feed of the resin can't be carried out.

In the current invention, since the organopolysiloxane having an ultra-high viscosity and the organopolysiloxane having a lower viscosity are dispersively contained in the thermoplastic resin used within the above-talked about liner, it is in fact that there isn't any necessity to make use of a lubricant between the interspace of the conduit and the inner cable, and a wonderful function that the sliding operation of the conduit and the interior cable might be smoothly carried out for a long period of time, is exhibited. Also, the durability of the above-talked about control cable largely relies upon upon the lubricant. The article of the current invention is to delete the above-mentioned disadvantages of conventional control cables and to supply a management cable which does not necessitate a lubricant to keep away from a fancy coating operation and which can be used with clean sliding operation of the inside cable for a long period of time. Among the many above-mentioned thermoplastic resins, polybutylene terephthalate having a melt index of 0.1 to 5 g/10 minutes will be particularly preferably used as a result of the change of load efficiency is small when the management cable is used for a protracted period of time.

Accordingly, it is preferable that the melt index is at the least 0.1 g/10 minutes. Accordingly, an organopolysiloxane having an ultra-excessive viscosity and an organopolysiloxane having a lower viscosity are used in the present invention so as to enhance extruding stability throughout producing a liner and to sufficiently launch these organopolysiloxanes on the surface of the resin sufficiently. Accordingly, when an interior coat is produced from the polytetrafluoroethylene, so-referred to as a paste-extrusion methodology is employed. The conduit contains, as an illustration, a coiled spring produced by winding one or plural flat steel wires or spherical steel wires in abutting convolutions and an outer coat manufactured from a artificial resin which covers the skin floor of the coiled spring. The inner cable normally comprises a stranded wire produced by twisting plural metallic wires or a stranded wire of which surroundings are coated with a synthetic resin or strengthened by twisting flat steel wires across the stranded wire.