3 Life-Saving Recommendations on Shield Control Cable > 자유게시판

As mentioned above, for the reason that management 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 is just not generated. However, there are a number of problems, in the control cable by which a lubricant is used, such as problem of operation for coating as a result of dispersion of the load effectivity of products is attributable to the unevenness of a coating, rubbishes and dusts are simply adhered to the lubricant when applying the lubricant to the management cable, shield control cable and drip and the like are generated. For example, in case the scarcity of lubricants is generated because of the lengthy interval use of the management cable, there are some problems that the liner is thoroughly worn down and the operationability of the control cable is excessively lowered, and the like. When the particle size of the powder is lower than 5 .mu.m, a pinholl is definitely generated because 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 components by weight of kerosene was added to 100 elements by weight of polytetrafluoroethylene powder (common particle dimension 25 .mu.m) and kneaded to present paste, and the paste was extruded under high pressure to provide a tube.

When the paste-extrusion technique is employed, it is preferable that paste is ready by including kerosene to polytetrafluoroethylene powder and kneading them, the paste is extruded to offer a tube underneath high stress and a stranded steel wire is coated with the tube, and after that, the stranded steel wire is dried and baked in a furnace resembling an electric furnace. When the content is more that 20% by weight, an extruded product cannot be produced because a slip of a resin happens on a cylinder barrel in an extruder and the constant feed of the resin can't be carried out. However, when a organopolysiloxane having too low a viscosity is contained in a large amount in the resin, there is a problem that the organopolysiloxane can't be successfully extruded to provide a liner, and thus the molding cannot be carried out due to the slipping of the resin on the cylinder barrel within the extruder. When the content material of the organopolysiloxane having an ultra-excessive viscosity is much less that 45% by weight and the content of the organopolysiloxane having a lower viscosity is more that 55% by weight, an extruded product can't be produced because a slide between a screw and a resin occurs in an extruder and the feed of the resin can't be carried out.

In the current invention, for the reason that organopolysiloxane having an ultra-excessive viscosity and the organopolysiloxane having a decrease viscosity are dispersively contained in the thermoplastic resin used within the above-mentioned liner, it is in fact that there is no such thing as a necessity to make use of a lubricant between the interspace of the conduit and the inner cable, and a superb operate that the sliding operation of the conduit and the inner cable might be smoothly carried out for an extended period of time, is exhibited. Also, the sturdiness of the above-talked about control cable largely relies upon upon the lubricant. The object of the present invention is to delete the above-mentioned disadvantages of conventional control cables and to offer 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 an extended period of time. Among the many above-mentioned thermoplastic resins, polybutylene terephthalate having a melt index of 0.1 to 5 g/10 minutes could be particularly ideally used because the change of load effectivity is small when the control cable is used for a protracted time period.

Accordingly, it is preferable that the melt index is at least 0.1 g/10 minutes. Accordingly, an organopolysiloxane having an extremely-excessive viscosity and an organopolysiloxane having a decrease viscosity are utilized in the current invention in order to improve 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-known 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 round steel wires in abutting convolutions and an outer coat fabricated from a synthetic resin which covers the skin floor of the coiled spring. The inner cable usually contains a stranded wire produced by twisting plural metallic wires or a stranded wire of which surroundings are coated with a artificial resin or bolstered by twisting flat steel wires across the stranded wire.